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BEGIN:VEVENT
SUMMARY:Interpolation environment of tensor mathematics at corpuscular sta
ge of computational experiment in hydrodynamics
DTSTART;VALUE=DATE-TIME:20170703T103000Z
DTEND;VALUE=DATE-TIME:20170703T104500Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-485@indico.jinr.ru
DESCRIPTION:Speakers: Alexander Degtyarev (Professor)\nStages of direct co
mputational experiments in hydrodynamics based on tensor mathematics tools
are represented by conditionally independent mathematical models for calc
ulations separation in accordance with physical processes [1]. Continual s
tage of numerical modeling is constructed on a small time interval in a st
ationary grid space. Here coordination of continuity conditions and energy
conservation is carried out. Then\, at the subsequent corpuscular stage o
f the computational experiment\, kinematic parameters of mass centers and
surface stresses at the boundaries of the grid cells are used in modeling
of free unsteady motions of volume cells that considered as independent pa
rticles. These particles can be subject to vortex and discontinuous intera
ctions\, when restructuring of free boundaries and internal rheological st
ates has place.\nTransition from one stage to another is provided by inter
polation operations of tensor mathematics [2]. Such interpolation environm
ent formalizes use of physical laws for mechanics of continuous media mode
ling\, provides control of rheological state and conditions for existence
of discontinuous solutions: rigid and free boundaries\, vortex layers\, th
eir turbulent or empirical generalizations. In the paper formalized numeri
cal objects with description of minimum necessary computational operations
of hydromechanics are presented. They include algorithms for synthesis of
polarized corpuscles in grid cells\, functional operations for the subseq
uent reassessment of the state of physical fields with the possibility of
refinement or extrapolation of numerical solutions in instability zones\,
near high-gradient fronts\, vortex layers and cavitation surfaces.\nNumeri
cal structures and related arithmetic-logical operations of object-oriente
d programming in C ++ are used as a tool.\nPractical examples of applicati
on of the proposed approach on several specific problems are given with a
discussion of the general and differences with the existing modeling metho
ds.\nShort biography note \nReferences\n1. A. Degtyarev\, V. Khramushin
Design and construction of computer experiment in hydrodynamics using exp
licit numerical schemes and tensor mathematics algorithms. //Mathematical
modeling\, 26:11 (2014)? 4-17\n2. Bogdanov A.\, Degtyarev A.\, Korkhov V.\
, New Approach to the Simulation of Complex Systems //EPJ Web of Conferenc
es\, 108\, 01002 (2016)\n\nhttps://indico.jinr.ru/event/137/contributions/
485/
LOCATION: 310
URL:https://indico.jinr.ru/event/137/contributions/485/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Intel® Performance Library is the fastest and most– used math l
ibrary for Intel®
DTSTART;VALUE=DATE-TIME:20170704T114500Z
DTEND;VALUE=DATE-TIME:20170704T120000Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-486@indico.jinr.ru
DESCRIPTION:Speakers: G. Fedorov (Intel)\nhttps://indico.jinr.ru/event/137
/contributions/486/
LOCATION:
URL:https://indico.jinr.ru/event/137/contributions/486/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Supercomputing Co-Design Technology
DTSTART;VALUE=DATE-TIME:20170703T070000Z
DTEND;VALUE=DATE-TIME:20170703T073000Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-487@indico.jinr.ru
DESCRIPTION:Speakers: Vladimir Voevodin (Lomonosov Moscow State University
\, Research Computing Center)\nhttps://indico.jinr.ru/event/137/contributi
ons/487/
LOCATION:
URL:https://indico.jinr.ru/event/137/contributions/487/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Updates of the information-software environment of the heterogeneo
us cluster HybriLIT
DTSTART;VALUE=DATE-TIME:20170703T140000Z
DTEND;VALUE=DATE-TIME:20170703T143000Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-488@indico.jinr.ru
DESCRIPTION:Speakers: Shushanik Torosyan (LIT)\nhttps://indico.jinr.ru/eve
nt/137/contributions/488/
LOCATION:
URL:https://indico.jinr.ru/event/137/contributions/488/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Opening welcome from JINR. Scientific Program of JINR
DTSTART;VALUE=DATE-TIME:20170703T060000Z
DTEND;VALUE=DATE-TIME:20170703T063000Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-490@indico.jinr.ru
DESCRIPTION:Speakers: Victor Matveev (JINR)\nhttps://indico.jinr.ru/event/
137/contributions/490/
LOCATION:
URL:https://indico.jinr.ru/event/137/contributions/490/
END:VEVENT
BEGIN:VEVENT
SUMMARY:ANALYSIS OF POLYDISPERSED VESICULAR SYSTEMS STRUCTURE: PARALLEL IM
PLEMENTATION OF THE SEPARATED FORM-FACTORS METHOD
DTSTART;VALUE=DATE-TIME:20170706T114500Z
DTEND;VALUE=DATE-TIME:20170706T120000Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-491@indico.jinr.ru
DESCRIPTION:Speakers: Maksim Bashashin (Laboratory of Information Technolo
gies\, JINR)\nThe separated form factors method (SFF) is an effective appr
oach to obtain information about a structure of vesicular systems from the
small angle scattering data. Parameters of vesicular system are determine
d by means of minimization of a discrepancy between experimental data on i
ntensity of small angle scattering and the results of respective SFF-based
calculations. The minimization procedure is based on the least square met
hod which was employed in the code FUMILI from the library JINRLIB. In thi
s contribution\, we utilize the parallel MPI-version of this code. Effecti
veness of parallel implementation is tested on the cluster HybriLIT. Resul
ts of numerical analysis of small angle neutron scattering data on polydis
persed population of phospholipid vesicles are presented.\nThe work is sup
ported by the Russian Scientific Foundation (project No. 14-12-00516).\n\n
https://indico.jinr.ru/event/137/contributions/491/
LOCATION: 406B
URL:https://indico.jinr.ru/event/137/contributions/491/
END:VEVENT
BEGIN:VEVENT
SUMMARY:NUMERICAL SIMULATION OF AEROHYDRODYNAMIC AND AEROHYDROELASTICITY P
ROBLEMS
DTSTART;VALUE=DATE-TIME:20170703T110000Z
DTEND;VALUE=DATE-TIME:20170703T111500Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-492@indico.jinr.ru
DESCRIPTION:Speakers: I. Afanasyeva (Joint-Stock Company “Scientific-Res
earch Centre “StaDyO”\, Moscow\, Russia)\nAerohydrodynamics and aerohy
droelasticity problems (also known as Fluid-Structure Interaction (FSI) pr
oblems) cause big and uninterrupted interest in science\, industry\, biome
dicine and other applications. Preconditions for a detailed study of the n
ature of aerohydrodelasticity and the search for methods that let to predi
ct consequences of strong wind impact and solve coupled problems related
to the civil engineering were a series of tragic cases of collapse and dan
gerous structural vibrations as a result of the occurrence of aerodynamic
instability (like vibrations of bridges and flexible building structures i
nteracting with wind flow)\, as well as the destruction of thin-walled met
allic tanks with liquid under intense seismic loads. Mentioned problems\,
characteristic and scientifically significant for very diverse technical a
pplications are still far from their exhaustive solution and require scien
tific and methodological and program-algorithmic research and development.
Present work gives an overview of the existing techniques for solving the
considered problems\; demonstrates developed numerical technique\, based
on effective mathematical models and numerical methods\; deals with the ve
rification and approbation of the developed numerical technique.\n\nhttps:
//indico.jinr.ru/event/137/contributions/492/
LOCATION: LIT Conference Hall
URL:https://indico.jinr.ru/event/137/contributions/492/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Modelling of the High Temperature Superconductors at Nonequilibriu
m Conditions
DTSTART;VALUE=DATE-TIME:20170703T140000Z
DTEND;VALUE=DATE-TIME:20170703T141500Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-493@indico.jinr.ru
DESCRIPTION:Speakers: Kirill Kulikov (BLTP)\nNonequilibrium effects in lay
ered superconducting materials that appears as a result of injection of a
stationary current are actively studied in recent years [1\,2\,3]. An exp
erimental proof of the existence of a nonequilibrium effect in intrinsic J
osephson junctions was given in [4] and was explained by the charge imbala
nce in the superconducting layers\, which arises as the result of injectio
n of the quasiparticle current.\n\nIn our work\, we provide a detailed num
erical simulations of intrinsic Josephson junctions of high temperature su
perconductors under external electromagnetic radiation taking into account
the charge imbalance effect [5]. We demonstrate that the charge imbalance
is responsible for a slope of the Shapiro steps on the current-voltage ch
aracteristic. The value of slope increases with a nonequilibrium parameter
. Coupling between junctions leads to a distribution of the slope's values
along the stack. The nonperiodic boundary conditions shift the Shapiro st
ep from the canonical position determined by a frequency of external radia
tion. This fact makes ambiguous the interpretation of the experimentally f
ound Shapiro step shift by the charge imbalance effect [6].\n\n1. S. Artem
enko and A. Kobelkov\, PRL 78\, 3551 (1996)\n2. C. Helm\, L.N. Bulaevskii\
, E.M. Chudnovsky and M.P. Maley\, PRL 89\, 057003 (2002)\n3. Yu.M. Shukri
nov and M.A. Gaafar\, PRB 84\, 094514 (2011)\n4. D.A. Ryndyk\, PRL 80\, 33
76 (1998)\n5. Yu. M. Shukrinov\, M. Nashaat\, K. V. Kulikov\, R. Dawood\,
H. El Samman and Th. M. El Sherbini\, EPL 115\, 20003 (2016)\n6. S. Rother
\, Y. Koval\, P. Müller\, R. Kleiner\, D.A. Ryndyk\, J. Keller and C. Hel
m\, PRB 67\, 024510 (2003)\n\nhttps://indico.jinr.ru/event/137/contributio
ns/493/
LOCATION: 406A
URL:https://indico.jinr.ru/event/137/contributions/493/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Intel® Parallel Studio XE for Distributed Computations
DTSTART;VALUE=DATE-TIME:20170704T131500Z
DTEND;VALUE=DATE-TIME:20170704T133000Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-494@indico.jinr.ru
DESCRIPTION:Speakers: G. Fedorov (Intel)\nhttps://indico.jinr.ru/event/137
/contributions/494/
LOCATION: 406B
URL:https://indico.jinr.ru/event/137/contributions/494/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Simulation of Anti-Matter Matter Interactions in GEANT4
DTSTART;VALUE=DATE-TIME:20170707T104500Z
DTEND;VALUE=DATE-TIME:20170707T110000Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-496@indico.jinr.ru
DESCRIPTION:Speakers: Aida Galoyan (Veksler and Baldin Laboratory of High
Energy Physics)\nOne of the most exciting puzzles in cosmology is connecte
d with the question of the existence of anti-matter in the Universe. A num
ber of dedicated cosmic ray experiments aim to search for anti-nuclei. Als
o\, anti-nuclei have been observed in nucleus-nucleus and proton-proton co
llisions by experiments at the RHIC and LHC accelerators. To support the e
xperimental studies of the anti-nuclei a Monte Carlo simulation of anti-nu
clei interactions with matter is implemented in the Geant4 toolkit. Geant4
is a software toolkit for the simulation of the passage of particles thro
ugh matter. Simulation codes for antiptoron and antinucleus interactions w
ith matter were implemented in the FTF model of Geant4. The implementati
on combines practically all known theoretical approaches to the problem of
antinucleon-nucleon interactions. Main components of the simulation algor
ithm of antiptoron and antinucleus-nucleus interactions in Geant4 will be
presented. Good agreement with simulation results and corresponding exper
imental data is reached.\n\nhttps://indico.jinr.ru/event/137/contributions
/496/
LOCATION: LIT Conference Hall
URL:https://indico.jinr.ru/event/137/contributions/496/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Multiscale Multilevel Approach to Solution of Nanotechnology Probl
ems
DTSTART;VALUE=DATE-TIME:20170707T073000Z
DTEND;VALUE=DATE-TIME:20170707T080000Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-497@indico.jinr.ru
DESCRIPTION:Speakers: Sergey Polyakov (Keldysh Institute of Applied Mathem
atics)\nThe multiscale multilevel approach for solution of nanotechnology
problems by supercomputer systems is presented. The approach is based on c
ombining the continuum mechanics models and the Newton's dynamics for indi
vidual particles. This combination includes three scale levels such as mac
roscopic\, mesoscopic and microscopic levels. For gas - metal technical sy
stems we use the following models. The quasihydrodynamic equations system
is used as a mathematical model at the macrolevel. The system of Newton's
equations is used as a mathematical model at the meso- and microlevels. Nu
merical implementation of the approach is based on the method of splitting
into physical processes. The quasihydrodynamic equations are solved by fi
nite volume method on grids of different types. The Newton's equations of
motion are solved by the Verlet integration in each cell of grid independe
ntly or in groups of connected cells. Within the framework of this general
methodology the four classes of algorithms and methods of their paralleli
zation are offered. Parallelization technology is based on the principles
of geometric parallelism and efficient partitioning the computational doma
in. Special dynamic algorithm is used for load balancing the solvers. The
testing of developed approach was made by the example of the nitrogen outf
low from balloon with high pressure to vacuum chamber through the micronoz
zle and microchannel. Obtained results confirm the high efficiency of the
developed methodology.\n\nhttps://indico.jinr.ru/event/137/contributions/4
97/
LOCATION:
URL:https://indico.jinr.ru/event/137/contributions/497/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Estimation of Magnetic Field Growth and Constraction of Adaptive M
esh in Corner Domain for Magnetostatic Problem in 3-Dimensional Space
DTSTART;VALUE=DATE-TIME:20170703T110000Z
DTEND;VALUE=DATE-TIME:20170703T111500Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-498@indico.jinr.ru
DESCRIPTION:Speakers: Aleksandr Tarelkin (Moscow State University)\nA magn
etostatic problem arises in searching for the distribution of the magnetic
field generated by magnet systems of many physics research facilities\, e
.g.\, accelerators. The domain in which the boundary-value problem is solv
ed often has a piecewise smooth boundary. In this case\, numerical calcula
tions of the problem require the consideration of the solution behavior in
the corner domain.\n\nBased on the estimate is obtained by E.E. Perepelki
n in his previous works\, we propose a method of condensing the differenti
al grid near the corner domain of vacuum in case of 3-dimensional space. A
n example of the modeling problem calculation in the corner domain is give
n.\n\nhttps://indico.jinr.ru/event/137/contributions/498/
LOCATION: 406A
URL:https://indico.jinr.ru/event/137/contributions/498/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Application of methods of machine learning and data mining to prob
lems of institutional economics
DTSTART;VALUE=DATE-TIME:20170706T111500Z
DTEND;VALUE=DATE-TIME:20170706T113000Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-499@indico.jinr.ru
DESCRIPTION:Speakers: Anna Kuznetsova (Institute of Biochemical Physics RA
S)\, Igor Kirilyuk (Institute of Economics RAS)\nMethods of machine learni
ng and data mining are widely used now in many tasks of physics\, chemistr
y\, biology\, medicine and in some other areas. Such techniques allow to o
btain reliable results in poorly formalized areas. The last several years
we used these methods for search of regularities in panel data of the sta
tistical indicators\, characterizing the institutional economy of differen
t countries of the world. Consideration of influence of institutional cha
racteristics of the countries connected with features of the legislation (
for example\, the property rights)\, traditions\, habits of citizens of th
e concrete countries on indicators of economic development is important fo
r borrowing of their experience\, including\, economic. Our analysis is ba
sed on variety of machine learning tools including some original technique
s. For verification of the identified regularities the methods based on p
ermutation tests\, which do not demand aprioristic assumptions of the nat
ure of probabilistic distributions\, and allowing correct application at t
he small data set. Panel data researches usually are associated with analy
sis of a large number of the factors\, characterizing relative dynamics of
economic indicators. So they demand adequate accounting of multiple testi
ng problem.\nThis work was supported by RFBR (grant №17-02-00207)\n\nht
tps://indico.jinr.ru/event/137/contributions/499/
LOCATION: 406B
URL:https://indico.jinr.ru/event/137/contributions/499/
END:VEVENT
BEGIN:VEVENT
SUMMARY:User software for numerical study of Josephson junction with magne
tic momenta
DTSTART;VALUE=DATE-TIME:20170706T124500Z
DTEND;VALUE=DATE-TIME:20170706T130000Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-500@indico.jinr.ru
DESCRIPTION:Speakers: Pavlina Atanasova (University of Plovdiv Paisii Hile
ndarski\, 24 Tzar Asen\, 4000 Plovdiv\, Bulgaria)\nPresented user software
is aimed at the field of science research. Potential users are physicists
who study Josephson junction with magnetic momenta. Computer implementati
on has been done by means of Wolfram Mathematica using the extensive capab
ilities of this system to create interactive dynamic objects. It enables t
o analyze the problem in amending all relevant physical parameters. The ac
curacy of the results is controlled. The users can choose a method for sol
ving the ODE. Advantage of the developed software is the creation of a pro
gramming model that implements the method of Runge-Kutta-Fehlberg method i
n which a predetermined accuracy of calculation is ensured. The results ca
n be displayed in different ways depending on what is needed to the user.
The resulting graphs and tables can be used by physicists in their study\,
articles and presentations.\n\nhttps://indico.jinr.ru/event/137/contribut
ions/500/
LOCATION:
URL:https://indico.jinr.ru/event/137/contributions/500/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Finding the spectral characteristics for systems with control
DTSTART;VALUE=DATE-TIME:20170707T120000Z
DTEND;VALUE=DATE-TIME:20170707T121500Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-501@indico.jinr.ru
DESCRIPTION:Speakers: Dmitry Kulyabov (PFUR & JINR)\nWe are studying the p
rocess of global synchronization in systems with control. As a control sys
tem\, we study the continuous model of the active control module of the ty
pe RED [1-3]. We apply the method of harmonic linearization. To simplify t
he model\, we applied the following: the model is written in moments\; The
model describes only the phase of avoiding overloading of the TCP Reno pr
otocol\; In the model\, only the reset is considered when obtaining 3 cons
ecutive ACK acknowledgments.\nTo determine the region of occurrence of aut
o-oscillations\, we use the Routh-Hurwitz criterion\, and to determine the
self-oscillation parameters\, the Mikhailov criterion.\nNext\, we use the
Fast Fourier Transform method to obtain the spectral characteristic. Veri
fy the model with NS2.\n\nhttps://indico.jinr.ru/event/137/contributions/5
01/
LOCATION:
URL:https://indico.jinr.ru/event/137/contributions/501/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Stability analysis of the IBR-2M pulsed reactor in an automatic re
gulated regime at the different level of average power
DTSTART;VALUE=DATE-TIME:20170703T140000Z
DTEND;VALUE=DATE-TIME:20170703T143000Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-502@indico.jinr.ru
DESCRIPTION:Speakers: Sumkhuu Davaasuren (JINR)\nThe IBR-2M pulse reactor
is characterized by a high level of reactivity fluctuations and\, as a con
sequence\, a high level of fluctuations in the regulated parameter-the amp
litude of the power pulses. Fluctuations of the regulated parameter relati
ve to the average level in the standard stabilization regime usually fall
within the range of 20% with possible emissions up to 40%\, which is close
to the limits of the emergency protection operation (50%). Taking this in
to account\, special and contradictory requirements are imposed on the aut
omatic regulator. In this paper\, the results of stability analysis of the
IBR-2M reactor in the automatic regulating regime at the different level
of average power are presented.\n\nhttps://indico.jinr.ru/event/137/contri
butions/502/
LOCATION:
URL:https://indico.jinr.ru/event/137/contributions/502/
END:VEVENT
BEGIN:VEVENT
SUMMARY:4-dimensional reconstruction of time-slices
DTSTART;VALUE=DATE-TIME:20170707T100000Z
DTEND;VALUE=DATE-TIME:20170707T101500Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-503@indico.jinr.ru
DESCRIPTION:Speakers: Valentina Akishina (GSI)\nTraditional latency-limite
d trigger architectures\, typical for conventional experiments with a hard
ware trigger\, are inapplicable for CBM. Instead\, the experiment will shi
p and collect time-stamped data into a readout buffer in a form of a time-
slice of a certain length with no isolated collisions\, and deliver it to
a large computer farm\, where online event reconstruction and selection wi
ll be performed. Grouping of measurements into physical collisions must be
performed in software and requires reconstruction not only in space\, but
also in time\, the so-called 4-dimensional track reconstruction and event
building. The tracks\, reconstructed with 4D Cellular Automaton track fin
der\, are combined into event-corresponding clusters according to the esti
mated time at the target position and its errors. The obtained events were
given as an input to the KF Particle Finder package for reconstruction of
short-lived particles.\n\nhttps://indico.jinr.ru/event/137/contributions/
503/
LOCATION: LIT Conference Hall
URL:https://indico.jinr.ru/event/137/contributions/503/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Simulation of transport traffic at urban crossroads using extended
Petri nets
DTSTART;VALUE=DATE-TIME:20170703T140000Z
DTEND;VALUE=DATE-TIME:20170703T143000Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-504@indico.jinr.ru
DESCRIPTION:Speakers: Irina Martynova (student)\nOur work is devoted to th
e construction and numerical study of low-level models of urban traffic ba
sed on extended Petri nets. We describe the basic principles for construct
ing such models. We propose an algorithm for automatic conversion of a giv
en graph description of a road network into a Petri net taking into accoun
t the resolution of conflict situations (on the basis of traffic rules). A
s an example\, we consider in detail the simulation of one of the most com
plex intersections in the Dubna town. The results of a numerical study of
the throughput capacity of this intersection are presented\, taking into a
ccount the different modes of traffic.\n\nhttps://indico.jinr.ru/event/137
/contributions/504/
LOCATION:
URL:https://indico.jinr.ru/event/137/contributions/504/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Investigation of the entropy of a system of many particles with gr
avitational interaction
DTSTART;VALUE=DATE-TIME:20170703T111500Z
DTEND;VALUE=DATE-TIME:20170703T113000Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-505@indico.jinr.ru
DESCRIPTION:Speakers: Denis Suchkov (Lomonosov Moscow State University)\nT
his paper is devoted to the study of entropy of a system of many particles
with gravitational interaction. The study of entropy behavior is based on
the Vlasov kinetic equation\, using both numerical and exact solution. In
view of the special laboriousness of the computation\, parallel algorithm
s using CUDA technology are implemented in this paper. A parallel algorith
m for solving the Vlasov equation by the particle method is presented. The
time dependence of entropy is obtained\, its analysis is carried out.\n\n
https://indico.jinr.ru/event/137/contributions/505/
LOCATION: 406A
URL:https://indico.jinr.ru/event/137/contributions/505/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The standard scheme of the analysis of a stability through Lie sym
metries and conservation laws: a nonlinear Schrodinger equation.
DTSTART;VALUE=DATE-TIME:20170707T121500Z
DTEND;VALUE=DATE-TIME:20170707T123000Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-506@indico.jinr.ru
DESCRIPTION:Speakers: Viktor Rikhvitsky (Joint Institute fo Nuclear Resear
ch)\nMany natural phenomena are described by a system of nonlinear partial
differential equations (PDEs) which is often difficult to be solved analy
tically\, as there is no a general theory for completely solving of the no
nlinear PDEs.\n\nOne of the most useful techniques is the Lie (classical)
symmetry method and to obtain the invariant solutions\, we focus on the ph
ysically interesting situations which admit potential symmetries. Then by
using the partial Lagrangian approach\, we find conservation laws.\n\nIn t
he study of PDEs\, conservation laws are important for investigating integ
rability and linearization mappings and for establishing existence and uni
queness of solutions. They are also used in the analysis of stability and
global behavior of solutions.\n\nThe common scheme (worksheet) presented
for known example: nonlinear Shodinger equation.\n\nhttps://indico.jinr.ru
/event/137/contributions/506/
LOCATION:
URL:https://indico.jinr.ru/event/137/contributions/506/
END:VEVENT
BEGIN:VEVENT
SUMMARY:J/ψ→e+e− decays selection criteria with TRD in CBM experiment
DTSTART;VALUE=DATE-TIME:20170707T094500Z
DTEND;VALUE=DATE-TIME:20170707T100000Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-507@indico.jinr.ru
DESCRIPTION:Speakers: Olga Derenovskaya (LIT JINR)\nCurrently the CBM expe
riment is being developed in GSI (Darmstadt\,\nGermany) at the FAIR accele
rator complex of an international\ncollaboration with JINR. One of the mai
n aims of the experiment is the\nstudy of charmonium production in nuclear
-nuclear collisions at high\nenergies. The key task in this problem is fas
t and reliable\nelectron–positron identification using the energy losses
of charged\nparticles in the Transition Radiation Detector (TRD). The cur
rent\npaper presents effective algorithm of the trajectories reconstructio
n in\nTRD based on the Cellular Automaton model. The comparision of the di
fferent\nelectron identification methods is also given.\n\nhttps://indico.
jinr.ru/event/137/contributions/507/
LOCATION: LIT Conference Hall
URL:https://indico.jinr.ru/event/137/contributions/507/
END:VEVENT
BEGIN:VEVENT
SUMMARY:MATEMATICAL MODELING OF RESONANT PROCESSES IN CONFINED GEOMETRY OF
ATOMIC AND ATOM-ION TRAPS
DTSTART;VALUE=DATE-TIME:20170705T050000Z
DTEND;VALUE=DATE-TIME:20170705T053000Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-508@indico.jinr.ru
DESCRIPTION:Speakers: Vladimir Melezhik (Bogoliubov Laboratory of Theoreti
cal Physics\, JINR)\nMATEMATICAL MODELING OF RESONANT PROCESSES IN CONFINE
D GEOMETRY OF ATOMIC AND ATOM-ION TRAPS\n\nV.S. Melezhik \nBogoliubov Labo
ratory of Theoretical Physics\, Joint Institute for Nuclear Research\, Dub
na Moscow Region 141980\, Russian Federation\nE-mail: melezhik@theor.jinr.
ru\n\n Mathematical modelling of resonant processes in confined geomet
ry of optical and electromagnetic traps is an actual problem of physics of
cold atoms and ions. The conventional theory for free-space resonant scat
tering is not valid for confined scattering and new approaches\, including
effects of the confinement\, are needed. In our works we have developed
a computational methods [1-4] for resonant collisions in tight atomic wave
guides and have found several novel effects in its application: the confin
ement-induced resonances (CIRs) in multimode regimes including effects of
transverse excitations and deexcitations [2]\, the so-called dual CIR yiel
ding a complete suppression of quantum scattering [1]\, and resonant molec
ule formation with a transferred energy to center-of-mass excitation while
forming molecules [5]. The last effect was recently confirmed in the Heid
elberg experiment [6]. Our calculations have also been used for planning a
nd interpretation of the Innsbruck experiment on investigation of CIRs in
ultracold Cs gas [7]. \n Our talk is devoted to computational aspects
of the developed theoretical models\, based on the nondirect product DVR [
4\,8\,9]\, for the time-dependent and stationary Schrödinger equations wi
th a few spatial variables..We also plan to discuss resent results obtaine
d with the developed approaches for the confined dipole-dipole [10] and at
om-ion scattering [11]. Particularly\, we investigate very complicate prob
lem of influence of the ion micromotion in Paul traps [12] on the resonanc
es.\n\n1. V.S.Melezhik\, J.I.Kim\, and P.Schmelcher\, Phys. Rev. A76 (2007
) 053611-1-15.\n2. S.Saeidian\, V.S.Melezhik\, and P.Schmelcher\, Phys. Re
v. A77 (2008) 042721-1-15.\n3. V.S.Melezhik\, Lecture Notes in Computer Sc
ience 7125\, Springer (2012) pp. 94-107.\n4. V.S.Melezhik\, EPJ Web of Con
ferences 108 (2016) 01008-1-9.\n5. V.S.Melezhik and P.Schmelcher\, New J.
Phys. 11 (2009) 073031-1-10.\n6. S. Sala et al. Phys. Rev. Lett. 110 (2013
) 203202-1-5\n7. E. Haller at al. Phys. Rev. Lett. 104 (2010) 153203-1-4.\
n8. V.S. Melezhik\, ICNAAM 2012\, AIP Conf. Proc. 1479 (2012) pp.1200-1203
.\n9. V.S. Melezhik\, Phys. Atom. Nucl. 77 (2014) pp.446-452.\n10. P. Gian
nakeas\, V.S. Melezhik\, and P. Schmelcher\, Phys.Rev.Lett. 111 (2013) 183
201-1-5.\n11. V.S. Melezhik and A. Negretti\, Phys. Rev. A94 (2016) 02270
4-1-8.\n12. D. Leibfried\, R.Blatt\, C.Monroe\, and D.Wineland\, Rev. Mod.
Phys. 75 (2003)pp.281-324.\n\nhttps://indico.jinr.ru/event/137/contributi
ons/508/
LOCATION: LIT Conference Hall
URL:https://indico.jinr.ru/event/137/contributions/508/
END:VEVENT
BEGIN:VEVENT
SUMMARY:IVC Calculation Problem for Josephson Junction Stacks. On Asymptot
ic Construction near the Breakpoint .
DTSTART;VALUE=DATE-TIME:20170706T103000Z
DTEND;VALUE=DATE-TIME:20170706T104500Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-509@indico.jinr.ru
DESCRIPTION:Speakers: Svetlana Serdyukova (JINR)\nA detailed investigation
of the IVC breakpoint and the breakpoint region width gives important inf
ormation [1]\,[2] concerning the peculiarities of stacks with a finite num
ber of intrinsic Josephson junctions. In [3] IVC for a stack of n Josephso
n junctions is defined numerically using the fourth- order Runge-\nKutta m
ethod. The current voltage characteristic has the shape of a Hysteresis lo
op. On the back branch of the Hysteresis loop\, near the breakpoint I_b\,
voltage V(I) decreases to zero rapidly. In addition\, in numerical modelli
ng (non-periodic boundary condition) IVC branching is observed near I_b. I
t is interesting to study\nthis phenomenon analytically developing asympto
tic methods. A numerical-analytical method was proposed in [4]. The genera
l scheme of suggested numerical-analytical method of the hysteresis loop c
alculation is following: the right branch of the hysteresis loop and the b
ack branch (not nearing some finite distance to I_b)\nare calculated using
the "asymptotic" formulas. The rest points (I\; V(I)) of the hysteresis l
oop are calculated numerically using the fourth- order Runge-Kutta method.
This method showed good results in IVC branching calculation in particula
r. I succeeded to calculate analytically the whole hysteresis loop in the
case of periodic boundary conditions. The approximate solution at the brea
kpoint region had been developed using the Bogolyubov-Krylov method [5].\n
\n1. Zappe H.H. Minimum current and related topics in Josephson tunnel jun
ction devices// Journal of Applied Physics\, Vol.44\, No.3\, 1371-1377\, 1
973.\n2. Matsuda Y.\, Gaifullin M.B.\, Kumagai K.\, Kadowaki K. and Mochik
u T. Collective Josephson Plasma Resonance in the Vortex State of Bi_2Sr_2
CaCu_2O_{8+d} //Vol.75\, No.24\,4512-4515\,1995.\n3. Shukrinov Yu.M.\, Mah
fousi F. and Pedersen N.F. Investigation of the Breakpoint Region in Stack
s with a Finite Number of Intrinsic Josephson Junctions //Phys.Rev. B 75\,
104508\, 2007.\n4. Serdyukova S.I. Numerical-Analytical Method for Computi
ng the Current-Voltage Characteristics for a Stack of Josephson Junctions/
/Computational Mathematics and Mathematical Physics\,2012\, Vol.52\, No.11
\, pp. 1590-1596.\n5. Н.Н.Боголюбов и Ю.А.Митрополь
ский "Асимптотические методы в теории не
линейных колебаний"\, ФМ\, Москва 1963\, стр.4
8.\n\nhttps://indico.jinr.ru/event/137/contributions/509/
LOCATION: LIT Conference Hall
URL:https://indico.jinr.ru/event/137/contributions/509/
END:VEVENT
BEGIN:VEVENT
SUMMARY:An attempt to build a smart real-time system for heavy element res
earch: approaches\, mathematical objects\, algorithms\, equations.
DTSTART;VALUE=DATE-TIME:20170707T063000Z
DTEND;VALUE=DATE-TIME:20170707T070000Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-510@indico.jinr.ru
DESCRIPTION:Speakers: Yury Tsyganov (JINR)\nThe Dubna Gas-Filled Recoil Se
parator is the most advanced facility currently in use in the field of res
earch of Superheavy Nuclei (SHN) [1]. During last year’s\, IUPAC establi
shed the priority of the DGFRS experiments in the discovery of new Z=114-1
18 elements. Definitely\, the DGFRS detection system and method of “acti
ve correlations” have played a significant role in these discoveries [2-
4]. Author defines abstract mathematical objects\, like correlation graph
and incoming event matrixes of a different nature in order to construct a
simple procedure of detecting rare events\, yet more exhaustive compared t
o the present one\, using real-time detection mode. In this case one can u
se any of n∙(n+1)/2 correlation graph edges to “trigger” beam irradi
ation pauses and thus provide “background free” conditions to search f
or ultra-rare alpha decays. Here n is the number of correlation graph node
s. Schematics of these algorithms are considered. Elapsed time value is us
ed as matrix element for each event type. In the case of DSSSD detector-ba
sed system those matrices have dimension (X\,Y)\, where X \, Y are the num
bers of horizontal and vertical strips\, respectively. Proposals for test
experiments with heavy-ion-induced reactions that can be used to check the
se approaches are considered. Some attention is paid to the forthcoming la
unch of a new FLNR ultra intense heavy ion DC-280 cyclotron for heavy elem
ent research. A role of a new protection and parameter monitoring system i
s discussed in a brief. Method to use more flexible correlation time inter
vals\, using e.g. either V.B. Zlokazov’s BSC (Background Signal Combinat
ions) or K._H. Schmidt’s LDSC (Linked Decay Signal Combinations) approa
ch [5-7]\, except for fixed time intervals\, is reported. In the last case
\, condition for the beam stop can be considered in the form of equation:P
corr(t\,ν) < ε \, where PCORR is random probability value for a given
correlation chain (i) measured in a real-time mode at the moment t\, ν i
s mean rate parameter for a given DSSSD pixel\, and ε is a preset small p
ositive value. Of course\, in this case one should additionally define one
extra matrix related to event rate for each pixel of DSSSD. Some attentio
n is paid to an analytical expression for SHE recoil registered with the D
GFRS detection system.\n\nReferences\n[1] P.J.Carol\,R.C.Barber\, B.M.She
rill\, E.Vardaci and T.Yamazaki // IUPAC Technical Rep.\, Pure.Appl.Chem\,
2016\; aop. (see also\, JINR press-relize\, Dec.2016)\n[2] Yu.S.Tsyganov
\, A.N.Polyakov and A.M.Sukhov //Nucl. Instrum. And Meth. In Phys. Res. 20
03. A513. Pp.413-416\n[3] Yu.S.Tsyganov // Phys. Part. Nucl. 2016.vol.47\,
No.1. pp. 73-107\n[4] Yu.S.Tsyganov // Phys. Part. Nucl. Lett. 2014. Vol
.45\, nos.5-6. Pp 1485-1531\n[5] V.B.Zlokazov // Eur. Phys. J. 2002. A 14
. P.147\n[6] K.-H. Schmidt et al. // Z. Phys. A- Atoms and Nuclei. 1984.
Vol.316. pp.19-26\n[7] V.B.Zlokazov and Yu.S.Tsyganov // Lett. to ECHAYA.
2010. Vol.7\, №6 (162)\, pp.658-666 /in Russian/\n\nhttps://indico.jinr.
ru/event/137/contributions/510/
LOCATION:
URL:https://indico.jinr.ru/event/137/contributions/510/
END:VEVENT
BEGIN:VEVENT
SUMMARY:On the Load Balancing Problem
DTSTART;VALUE=DATE-TIME:20170707T060000Z
DTEND;VALUE=DATE-TIME:20170707T063000Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-511@indico.jinr.ru
DESCRIPTION:Speakers: Gabriel Semanišin (Faculty of Science\, P.J. Šafá
rik University Košice\, Slovakia)\nWe present new results on the Load Bal
ancing Problem that concerns and assigment of given jobs to a set of machi
nes each of which can process a subset of jobs. Each job requires one unit
of processing time and must be assigned to some machine that can process
it. The jobs have to be assigned in such a manner that minimises the total
completion time. We exploit graph theory models and the divide-and-conque
r nature of the semi-matching problem. We derive three algorithms for the
optimal semi-matching problem. The first one runs in time O(√n · m ·
log n) on a graph with n vertices and m edges. The second one is randomize
d and computes an optimal semi-matching with high probability in time O(n^
c · log^(1+o(1)) n)\, where c is the exponent of the best known matrix mu
ltiplication algorithm. Since < 2.38\, this algorithm breaks through O(n^
2.5) barrier for dense graphs. In the case of planar graphs\, the third on
e computes an optimal semi-matching in deterministic time O(n · log^4 n).
The character of designed algorithms allows parallelisation and distribut
ed computing.\n\nhttps://indico.jinr.ru/event/137/contributions/511/
LOCATION:
URL:https://indico.jinr.ru/event/137/contributions/511/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Shape Approximation Based on Higher-Degree Polynomials
DTSTART;VALUE=DATE-TIME:20170706T083000Z
DTEND;VALUE=DATE-TIME:20170706T090000Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-512@indico.jinr.ru
DESCRIPTION:Speakers: Nikolay Dikusar (JINR)\nShape Approximation Based on
Higher-Degree Polynomials \nN.D. Dikusar \nJoint Institute for Nuclear Re
search\, \nLaboratory of Information Technologies\, Dubna 141980\, Russia
\ndnd@jinr.ru\nThe planar shape (contour) of an object is a fundamental so
urce of information in a pattern recognition problem. Obtaining the releva
nt information set rests on difficult procedures and is a key problem in p
attern recognition [1]. A method is proposed for the segmentation of conto
urs with a complex geometrical form. It is based on a parametric piecewise
approximation of 12th order spanned by a polynomial model defined by basi
c elements [2]. Higher-order polynomial approximation [3]\, [4] allows to
optimize the number of segments on the contour and to obtain analytically
the dependence of the curvature for more exact calculation of informative
signs that are invariant to geometrical transformations. The algorithm bas
ed on this method as well as specific examples are described in detail.\nR
eferences\n[1] M. Worring\, Shape Analysis of Digital Curves\, Febodruk\,
Enschede\, 1993.\n[2] N. D. Dikusar. The Basic Element Method// MMCS\, 201
1\, v.3 №4\, pp.492-507. http://link.springer.com/article/10.1134%2FS207
0048211040053\n[3] N. D. Dikusar. Higher-order polynomial approximation //
MMCS\, 2016\, v.8 №2\, pp.183-200. http://link.springer.com/article/10.1
134/S2070048216020058\n[4] N. D. Dikusar. Piecewise polynomial approximati
on of the sixth order with automatic knots detection //MMCS\, 2014\, v.6
№5\, pp.509-522.\n http://link.springer.com/article/10.1134%2FS207004821
4050020\n\nhttps://indico.jinr.ru/event/137/contributions/512/
LOCATION: LIT Conference Hall
URL:https://indico.jinr.ru/event/137/contributions/512/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Provable programming of algebra: arithmetic of fractions
DTSTART;VALUE=DATE-TIME:20170707T093000Z
DTEND;VALUE=DATE-TIME:20170707T094500Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-607@indico.jinr.ru
DESCRIPTION:Speakers: Sergei Meshveliani (Program systems institute\, Pere
slavl-Zalessky\, Russia)\nIt is described a certain provable program for a
generic arithmetic\nof fractions. This is a small part of the project DoC
on-A of provable\nprograms for a computer algebra library. In this system\
, functional\nprograms for known algebraic methods are written together wi
th proofs\, and proofs are automatically checked by the compiler (see the
Coq and Agda systems). The used language (Agda) is purely functional and i
ncludes the feature of dependent types. This paper describes provable prog
ramming of arithmetic of fractions over arbitrary ring with gcd.\n\nhttps:
//indico.jinr.ru/event/137/contributions/607/
LOCATION: 310
URL:https://indico.jinr.ru/event/137/contributions/607/
END:VEVENT
BEGIN:VEVENT
SUMMARY:New Possibilities and Applications of the Method of Collocations a
nd the Least Residuals
DTSTART;VALUE=DATE-TIME:20170706T060000Z
DTEND;VALUE=DATE-TIME:20170706T063000Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-513@indico.jinr.ru
DESCRIPTION:Speakers: Vasily Shapeev (Novosibirsk National Research Univer
sity\, Novosibirsk\, Russia\, Khristianovich Institute of Theoretical and
Applied Mechanics\, Russian Academy of Sciences\, Novosibirsk\, Russia)\nI
n the numerical method of collocations and the least residuals (CLR)\,\nth
e boundary differential problem using the collocation method is\nprojected
into a finite-dimensional linear functional space. To find the\nsolution
of the obtained approximate problem\, an overdetermined system\nof linear
algebraic equations (SLAE) is written out and it is required\nthat on its
solution the minimum of the discrepancy functional of all\nits equations i
s attained. From this requirement and the presence of a\npiecewise analyti
c solution of the approximate problem\, a number of\nmerits of the method
follows. In particular\, the algorithms of the CLR\nmethod are relatively
simple to apply in non-canonical regions and on\nirregular grids. It is re
latively simple to build variants of the method\nof increased accuracy\, i
ncluding those for sufficiently ill-conditioned\nproblems and with singula
rities in the solution of the initial\ndifferential problem. Its algorithm
s are easily parallelized. In the CLR\nmethod\, modern algorithms of compu
tational mathematics are effectively\nused: multigrid complexes\, Krylov s
ubspaces\, preconditioners\, irregular\ngrids. The presented report will g
ive a brief overview of the latest\nresults obtained in the CLR method and
demonstrate its indicated\nproperties.\n\nhttps://indico.jinr.ru/event/13
7/contributions/513/
LOCATION: LIT Conference Hall
URL:https://indico.jinr.ru/event/137/contributions/513/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Modeling Quantum Behavior in the Framework of Permutation Groups
DTSTART;VALUE=DATE-TIME:20170706T063000Z
DTEND;VALUE=DATE-TIME:20170706T070000Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-514@indico.jinr.ru
DESCRIPTION:Speakers: Vladimir Kornyak (LIT JINR)\nThe trajectory of a qua
ntum system is a sequence of unitary evolutions of vectors in a Hilbert sp
ace\, interspersed with observations --- projections of the vectors in som
e subspaces\, that are specified by measuring devices. The result of quant
um observation is random and its statistics is described by a probability
measure defined on subspaces of the Hilbert space. Gleason's theorem gives
a general construction of all possible probability measures on subspaces
of a Hilbert space. In fact\, this construction reproduces the Born rule f
or quantum probabilities. Quantum-mechanical description can be made const
ructive\, if we replace the general group of unitary transformations of th
e Hilbert space by unitary representations of finite groups. It is known t
hat any linear representation of a finite group can be realized as a subre
presentation of some permutation representation. Thus\, quantum mechanical
problems can be formulated in terms of groups of permutations. Such a con
structive approach allows us to clarify the meaning of a number of physica
l concepts. Combining methods of computational group theory with Monte Car
lo simulation we study models based on the natural and standard representa
tions of symmetric groups.\n\nhttps://indico.jinr.ru/event/137/contributio
ns/514/
LOCATION: LIT Conference Hall
URL:https://indico.jinr.ru/event/137/contributions/514/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Nonlinear wave simulation on the Xeon Phi Knights Landing Process
or
DTSTART;VALUE=DATE-TIME:20170703T140000Z
DTEND;VALUE=DATE-TIME:20170703T143000Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-515@indico.jinr.ru
DESCRIPTION:Speakers: Ivan Hristov (University of Sofia / JINR)\nA finite
difference scheme for solving systems of 2D Sine-Gordon equations is const
ructed. A parallelization strategy with both thread and SIMD levels of par
allelism is proposed and an OpenMP program is realized. The program is tes
ted on two different Intel architectures: 2x Xeon E5-2695 v2 processors\,
(code-named “Ivy Bridge-EP”) in the Hybrilit cluster and on Xeon Phi
7250 processor (code-named “Knights Landing” (KNL)). As a result we a
chieve good performance scalability on both architectures and better perfo
rmance on KNL processor. A numerical example of a standing nonlinear wave
is given.\n\nhttps://indico.jinr.ru/event/137/contributions/515/
LOCATION:
URL:https://indico.jinr.ru/event/137/contributions/515/
END:VEVENT
BEGIN:VEVENT
SUMMARY:File system access speed test
DTSTART;VALUE=DATE-TIME:20170703T140000Z
DTEND;VALUE=DATE-TIME:20170703T143000Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-516@indico.jinr.ru
DESCRIPTION:Speakers: S. Popkov ()\nhttps://indico.jinr.ru/event/137/contr
ibutions/516/
LOCATION:
URL:https://indico.jinr.ru/event/137/contributions/516/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Fractional stochastic field theory
DTSTART;VALUE=DATE-TIME:20170705T063000Z
DTEND;VALUE=DATE-TIME:20170705T070000Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-517@indico.jinr.ru
DESCRIPTION:Speakers: Juha Honkonen (Finnish National Defence University)\
nModels describing evolution of physical\, chemical\, biological\, social
and financial processes are often formulated as differential equations wit
h the understanding that they are large-scale equations for averages of qu
antities describing intrinsically random processes. Explicit account of ra
ndomness may lead to significant changes in the asymptotic behaviour (anom
alous scaling) in such models especially in low spatial dimensions\, which
in many cases may be captured with the use of the renormalization group.
Anomalous scaling and memory effects may also be introduced with the use o
f fractional derivatives and fractional noise. Construction of renormalize
d stochastic field theory with fractional derivatives and fractional noise
in the underlying stochastic differential equations and master equations
and the interplay between fluctuation-induced and built-in anomalous scali
ng behaviour is reviewed and discussed\n\nhttps://indico.jinr.ru/event/137
/contributions/517/
LOCATION: LIT Conference Hall
URL:https://indico.jinr.ru/event/137/contributions/517/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Dynamical and Thermodynamic Electronic Properties of DNA
DTSTART;VALUE=DATE-TIME:20170704T053000Z
DTEND;VALUE=DATE-TIME:20170704T060000Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-518@indico.jinr.ru
DESCRIPTION:Speakers: Victor Lakhno (Institute of Mathematical Problems of
Biology of RAS\, Pushchino\, Russia)\nDynamical properties of electron mo
tion in molecular chains are considered. The charge motion is described in
terms of quantum mechanics\, whereas vibrational degrees-of-freedom are t
reated both classically and quantum mechanically. \nThe dynamics of charge
migration was modeled to calculate temperature dependencies of its thermo
dynamic equilibrium values such as energy and electronic heat capacity in
homogeneous adenine fragments. The peak on the graph of electronic heat c
apacity is observed at the polaron decay temperature. \nA typical charge t
ransfer/transport pattern can physically be viewed as a polaron and/or sol
iton. A closed analytical expression for charge carrier velocity dependenc
e on electric field has been derived and analyzed in detail. \nSpecia
l attention is given to: dynamical behavior of electrons in rigid chains\,
band structure of regular polynucleotide chains\, dynamics of polaron sta
tes formation in Holstein chain\, polaron motion in an electric field\, th
e role of dispersion\, Bloch oscillations and breather states. \nThe work
was supported by RSF project 16-11-10163.\n\nhttps://indico.jinr.ru/event/
137/contributions/518/
LOCATION: LIT Conference Hall
URL:https://indico.jinr.ru/event/137/contributions/518/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Periodic solutions in isothermal problems filtration of hydrocarbo
n mixtures
DTSTART;VALUE=DATE-TIME:20170703T134500Z
DTEND;VALUE=DATE-TIME:20170703T140000Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-519@indico.jinr.ru
DESCRIPTION:Speakers: Yulia Pazyuk (JIHT RAS)\nAn oscillatory flow regime
of the formation fluid is sometimes observed at the operating gas-condensa
te reservoirs which entails unbalance of the well operation and leads to u
nstable work of the well. Both external impact of periodic factors and mon
otonous energy inflows into the system could be the reasons for observed p
ulsations. The system converts the incoming energy into vibrations due to
its nonlinearty. Therefore investigation of the wave filtration regime\, w
hich is discovered during the development of oil and gas-condensate field
s\, is relevant.\nThe possibility of occurrence of periodic solutions in t
he filtration process is associated both with the stability loss of statio
nary solutions of the general two-phase multicomponent filtration equation
s and with the transformation of the resolving equation for pressure into
wave equation with certain combination of numerical values of its paramete
rs. The solution of the wave equation makes it possible to describe mathem
atically the conditions for the occurrence of such oscillatory flow regime
s for a gas-condensate system in a first approximation.\nThe paper focuses
on a mathematical description of the wave filtration process\, obtainment
of the periodic solutions of the isothermal two-phase filtration problem
and calculation of the period of these oscillations depending on the param
eters characterizing the mixture and the porous medium. It is shown that p
eriodic solutions can be obtained not for any values of these parameters\,
but only for a their certain combination.\nThis work is supported by RFBR
(project № 17-08- 01270).\n\nhttps://indico.jinr.ru/event/137/contribut
ions/519/
LOCATION: LIT Conference Hall
URL:https://indico.jinr.ru/event/137/contributions/519/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Asymptotics for penalized splines
DTSTART;VALUE=DATE-TIME:20170704T124500Z
DTEND;VALUE=DATE-TIME:20170704T130000Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-520@indico.jinr.ru
DESCRIPTION:Speakers: Eugeny Schetinin (MSUT "STANKIN")\, Pavel Lyubin (MS
UT "STANKIN")\nAlgorithmic complexity is a very important topic in compute
r science. Knowing the complexity of algorithms allows you to answer quest
ions such as "How long will a program run on an input?"\, "How much space
will it take?" and "Is the problem solvable?". These are important bases o
f comparison between different algorithms. An understanding of algorithmic
complexity provides programmers with insight into the efficiency of their
code.\n We perform an asymptotic analysis of penalized spline estimators
. We compare P-splines and splines with a penalty of the type used with sm
oothing splines. A P-spline and a smoothing spline are asymptotically equi
valent provided that the number of knots of the P-spline is large enough\,
and the two estimators have the same equivalent kernels for both interior
points and boundary points. We consider the convergence of the algorithm
as well as the uniqueness of its solution.\n Also\, we develop asymptotic
theory with quasi-solution for penalized spline estimators in generalized
additive models. Our purpose is to establish the asymptotic bias and vari
ance as well as the asymptotic normality of the penalized spline estimator
s proposed by Marx and Eilers.\n\nReferences\n[1] de Boor C. A Practical G
uide to Splines. Springer-Verlag\, 2001.\n[2] Eilers P.H.C. and Marx B.D.
Flexible smoothing with B-splines and penalties(with Discussion)\, pages 8
9-121. Statist.Sci. 11\, 1996.\n[3] Hastie T. and Tibshirani R. Generalize
d Additive Models. Chapman & Hall\, London\, 1990.\n[4] Lyubin P.G. and Sh
chetinin E.Yu. Fast Two-Dimensional Smoothing with Discrete Cosine Transfo
rm\, pages 646–656. Springer International Publishing\, Cham\, 2016.\n[5
] O'Sullivan F. A statistical perspective on ill-posed inverse problems(wi
th discussion)\, pages 505-527. Statist. Sci. 1\, 1986.\n[6] Ruppert D. an
d Wand M.P. and Carroll R.J. Semiparametric Regression. Cambridge Universi
ty Press\, Cambridge\, 2003.\n[7] Wood S.N. Generalized Additive Models: A
n Introduction With R. Chapman & Hall/CRC\, New York\, 2006.\n\nhttps://in
dico.jinr.ru/event/137/contributions/520/
LOCATION: 406A
URL:https://indico.jinr.ru/event/137/contributions/520/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Comparison of optimal control properties for linear fractional-ord
er systems described by equations with different type of fractional deriva
tive
DTSTART;VALUE=DATE-TIME:20170703T140000Z
DTEND;VALUE=DATE-TIME:20170703T143000Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-521@indico.jinr.ru
DESCRIPTION:Speakers: Sergey Postnov (V.A. Trapeznikov Institute of Contro
l Sciences)\nLinear time-invariant fractional-order systems with lumped pa
rameters considered in several cases\, which differ from each other by fra
ctional derivative type in system dynamics equation. The Caputo\, Riemann-
Liouville and Hadamard derivatives used. Two kinds of optimal control prob
lem are investigated: the problem of control with minimal norm and the pro
blem of control with minimal time at given restriction on control norm. Ad
missible controls allowed to be the $p$-integrable functions ($p>1$) at ha
lf-interval. The optimal control problem studied by moment method. The cor
rectness and solvability conditions for the corresponding moment problem a
re derived. For several special cases the optimal control problems stated
are solved analytically. Some analogies pointed for results obtained with
the results which are known for integer-order systems. Comparative analysi
s results represented for fractional-order systems describing by equations
with Caputo-\, Riemann-Liouville- and Hadamard-type derivatives.\n\nhttp
s://indico.jinr.ru/event/137/contributions/521/
LOCATION:
URL:https://indico.jinr.ru/event/137/contributions/521/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Web service for analysis of experimental data on HPC platforms usi
ng package ROOT
DTSTART;VALUE=DATE-TIME:20170704T114500Z
DTEND;VALUE=DATE-TIME:20170704T120000Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-522@indico.jinr.ru
DESCRIPTION:Speakers: Aleksandr Mayorov (JINR)\nScientists get large amoun
t of raw experimental data when conducting experiments. These data are ana
lyzed using package ROOT. Processing of large data requires high-performan
ce computers\; thus\, analysis of experimental data is performed on high-p
erformance clusters.\nConducting data analysis on cluster requires some pr
eparatory work: it is necessary to download files to the cluster\, write m
acros\, download results\, etc. Also\, it is important to note that users
work remotely and this might cause some problems\, in particular\, slow re
sponse time of GUI.\n For a more efficient work on the cluster and optimiz
ation of the process of experimental data analysis\, a dedicated web servi
ce has been developed. This web service allows computing users tasks on hi
gh-performance cluster while visualizing results on the client computer. T
he web service communicates with task manager and distributed file system
of the computing complex.\nUsers can create\, delete\, start and stop task
s on cluster. The web app has several templates for different types of use
r tasks that makes it possible to quickly create new task and submit it fo
r computation on the cluster. Users can also browse directories and open f
iles on the file system of the cluster using web interface.\n\nhttps://ind
ico.jinr.ru/event/137/contributions/522/
LOCATION: 406B
URL:https://indico.jinr.ru/event/137/contributions/522/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Time-based global track reconstruction in the CBM experiment
DTSTART;VALUE=DATE-TIME:20170707T101500Z
DTEND;VALUE=DATE-TIME:20170707T103000Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-523@indico.jinr.ru
DESCRIPTION:Speakers: Timur Ablyazimov (JINR)\nCBM (“Compressed Baryonic
Matter”) is an experiment being prepared to operate at the future Facil
ity for Anti-Proton and Ion Research (FAIR) in Darmstadt\, Germany. CBM wi
ll explore the high-density region of the QCD phase diagram by investigati
ng nuclear collisions from 2 to 45 GeV beam energy per nucleon. Its main f
ocus is the measurement of very rare probes (e.g. charmed hadrons)\, which
requires interaction rates of up to 10 MHz. A specific feature of the exp
eriment will be the free-running data acquisition fashion\, without a hard
ware trigger. It differs from the traditional event-based approach\, and d
emands taking to account the measurements time-coordinate in track reconst
ruction\, and using smart approaches to cope with an enormous combinatoric
s.\n\nPhysical studies in the CBM experiment are planned to based on the t
he so called "global" track reconstruction - which means the reconstructed
tracks comprise data\, obtained from different detectors. Before the auth
ors started their work\, the only time-based track reconstruction componen
t\, available in the CBM software repository\, was an STS-tracks reconstru
ctor L1. The existing CBM global tracking facility Littrack worked only in
the event by mode.\n\nEfforts were applied for making the Littrack librar
y be able to work in the time-based mode\, as well as to the development o
f a stand alone time-based solution for creating the global tracks\, basin
g on the already available STS reconstructed track and measured hits in th
e Time of Flight (ToF)detector.\n\nhttps://indico.jinr.ru/event/137/contri
butions/523/
LOCATION: LIT Conference Hall
URL:https://indico.jinr.ru/event/137/contributions/523/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Density Based Clustering of Brownian Dynamics Trajectories Reveals
Predominant Energetically Favorable Orientations in Protein-Protein Inter
actions
DTSTART;VALUE=DATE-TIME:20170704T131500Z
DTEND;VALUE=DATE-TIME:20170704T133000Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-524@indico.jinr.ru
DESCRIPTION:Speakers: Sergei Khruschev (Lomonosov Moscow State University)
\nProtein-protein interactions are of central importance for virtually eve
ry process in living matter. Simulation of protein association dynamics is
crucial for understanding their functionality. In Brownian dynamics prote
ins are considered as rigid bodies subjected to electrostatic and random B
rownian forces. This rough approximation is rather accurate when protein s
urfaces do not touch each other\, and in combination with molecular dynami
cs used to simulate close contact of molecules this simulation technique p
rovides complete reconstruction of protein-protein interaction over large
temporal and spatial scales.\n\nBrownian dynamics is not so computationall
y expensive as molecular dynamics\, thus allowing exhaustive sampling of r
elative orientations of protein molecules approaching each other in a virt
ual reaction space. Long-range electrostatics is the major factor effectin
g molecule orientation on encounter. To gain some understanding of the rol
e of electrostatic interactions at successive stages of protein-protein co
mplex formation we need to detect and somehow describe intermediate metast
able states on the association pathway. To do so we sample frames if elect
rostatic attraction energy between proteins is above some predefined thres
hold and analyze similarity of sampled structures in terms of root-mean-sq
uare deviation (RMSD) of their atomic positions in aligned to each other s
tructures. Density based clustering technique [Khruschev et al.\, 2015] al
lows to find if all sampled structures constitute a single group\, or they
can be classified into several distinct clusters\, and obtain characteris
tics of such groups (clusters).\n\nWe performed a comparative study of dif
fusional encounter of photosynthetic electron transport proteins cytochrom
e f and plastocyanin from two species of cyanobacteria (Phormidium and Nos
toc) and higher plants. Cytochrome f is an exposed to thylakoid lumen subu
nit of a large transmembrane cytochrome b6f complex\, its redox center is
a type C heme. Plastocyanin is a copper-containing mobile carrier performi
ng shuttle electron transfer from cytochrome f to photosystem I. Spatial s
tructures of these proteins are similar\, but the amino acid sequences sig
nificantly vary. Thus electrostatic properties of the binding sites in all
three protein pairs are rather different.\n\nFor cyanobacterial proteins
formation of structures with electrostatic attraction energy of 4kT or gre
ater is a very rare event (k_on is less than 10^7 M-1 s-1). Several electr
ostatically favorable binding modes were identified by density based clust
ering for these species. However\, Phormidium plastocyanin always approach
es cytochrome f far from its redox center (heme)\, thus electron transport
is very unlikely in these orientations. So we can suppose that electrosta
tic interactions should not play any significant role in formation of Phor
midium plastocyanin-cytochrome f functionally active complex. This can be
confirmed by the fact that experimentally obtained reaction rate for these
proteins does not depend on solution ionic strength. Salt ions screen pro
tein charges thus addition of salt weakens electrostatic interactions betw
een proteins whereas for Phormidium proteins it does not change the reacti
on rate.\n\nOn the contrary\, Nostoc plastocyanin in most cases binds dire
ctly to the heme location in two predominant orientations (43% and 40% of
all sampled structures). Copper atom is turned toward cytochrome f in all
these structures\, thus we conclude that electrostatic interactions facili
tate the formation of final complex capable of electron transport. Indeed\
, in experiments we can see strong dependence of electron transfer rate fr
om the ionic strength.\n\nIn higher plants\, formation of structures with
attraction energy of 4kT or greater is much more frequent (k_on is above 1
0^9 M-1 s-1). The structures constitute one uniformly dense group\, in wh
ich plastocyanin is located nearby heme of cytochrome f\, but its copper a
tom is turned from the contact area. However\, plastocyanin retains notice
able rotational freedom around its center of mass. We sampled protein orie
ntations with even higher energy threshold of 8kT\, and k_on still remaine
d rather high (more than 10^7 M-1 s-1)\, but two distinct groups of plasto
cyanin orientations were detected. In 57% of structures a flexible single-
point joint is formed by oppositely charged areas of two proteins\, thus a
llowing thermal motion to rotate plastocyanin molecule into electron-trans
fer-capable orientation without breaking electrostatic link. In remaining
structures binding of plastocyanin is much more tight\, and its orientatio
n suppresses electron transfer. We suppose that in higher plants the proce
ss of final complex formation involves at least two stages: the first is d
iffusive entrapment of plastocyanin by cytochrome f\, and the second is or
ientation adjustment in the transient complex.\n\nThis work is supported b
y Russian Foundation for Basic Research projects 15-04-08681\, 15-07-08927
\, and 17-04-00676.\n\nReferences\n\nKhruschev\, S.S.\, Abaturova\, A.M.\,
Fedorov\, V.A. et al. BIOPHYSICS (2015) 60: 513. doi:10.1134/S00063509150
40156\n\nhttps://indico.jinr.ru/event/137/contributions/524/
LOCATION: LIT Conference Hall
URL:https://indico.jinr.ru/event/137/contributions/524/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Spectral Multi Exponential Approximation as a Robust Tool for Anal
ysis of Complex Systems
DTSTART;VALUE=DATE-TIME:20170703T134500Z
DTEND;VALUE=DATE-TIME:20170703T140000Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-525@indico.jinr.ru
DESCRIPTION:Speakers: Sergei Khruschev (Lomonosov Moscow State University)
\nThe behavior of various systems in living and nonliving matter may be ch
aracterized mathematically by a linear combination of exponential function
s. Many types of scientific experiments are often conducted in such a way
that changes in some characteristic variable in response to some perturbat
ion are recorded. These measurements yield data referred to as a signal. A
ssuming the signal by its nature is a linear combination of exponential fu
nctions\, each of them characterizing response of particular subsystem to
the perturbation\, the researcher faces a task to find parameters (amplitu
des and characteristic times) of particular exponential functions constitu
ting the signal. There is no common method to find these parameters in gen
eral case because the problem is ill-conditioned.\n\nIn particular cases t
he task may be solved by linear regression. We develop the method of spect
ral multi-exponential approximation (SMEA) [Plyusnina et al.\, 2015]\, in
which characteristic times of exponential functions are taken over fixed l
ogarithmic scale\, and non-negative least square solver is used to find pr
e-exponential factors. These factors (amplitudes) constitute discrete spec
trum. To obtain scale-independent transform\, for any arbitrary characteri
stic time we define the integral amplitude as a partial sum of estimated a
mplitudes corresponding to characteristic times less than this arbitrary t
ime. Integral amplitude is a step function\, and its plot against time pro
vides a pictorial representation of the SMEA transform. A heatmap visualiz
ation of the integral amplitude with characteristic times coded by color i
s suitable for representation of a large sample of signals.\n\nThis method
was applied for analysis of chlorophyll fluorescence transient in ecologi
cal and biotechnological studies. The measurement of the kinetics of chlor
ophyll fluorescence transient of algae and plants is a widely used method
for determining the state of photosynthetic apparatus. The time dependence
of the fluorescence intensity is a complex multiphase curve\, which depic
ts the various stages of the electron transfer in the electron transport c
hain of chloroplasts. SMEA allows to formalize phase identification\, to e
stimate quantitative characteristics of individual phases of the induction
curve (amplitudes and characteristic times)\, and to reveal hidden phases
of the curve. Occurrence of additional phases on the induction curve poin
ts to a change in the functioning of the photosynthetic apparatus in respo
nse to changing growth conditions. A high sensitivity of SMEA allows to su
ggest it for detection of early cell response to stress. SMEA decompositio
n and visualization techniques may find broad application in various signa
l processing tasks\, especially in the analysis of the response of complex
biological systems to external impact.\n\nThis work is supported by Russi
an Foundation for Basic Research project 17-04-00676.\n\nReferences\n\nPly
usnina\, T.Y.\, Khruschev\, S.S.\, Riznichenko\, G.Y. et al. BIOPHYSICS (2
015) 60: 392. doi:10.1134/S000635091503015X\n\nhttps://indico.jinr.ru/even
t/137/contributions/525/
LOCATION: 406A
URL:https://indico.jinr.ru/event/137/contributions/525/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Analitical solution for Experimental Data Approximation by Solvin
g Linear Difference Equations with Constant Coefficients.
DTSTART;VALUE=DATE-TIME:20170706T140000Z
DTEND;VALUE=DATE-TIME:20170706T141500Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-531@indico.jinr.ru
DESCRIPTION:Speakers: Vladimir Smirnov (Azforus” LTD\, Moscow\, Russia)\
nThis paper proposes an analitical method for approximating experimental d
ata points X*(j) by the curves representing the solutions of linear differ
ence equations with constant coefficients\, in particular\, by the curves
of the exp*cos class (for the second-order equation - in form of\nX(j) = c
1 • X(j – 1) + c2 • X(j – 2) + b).\n As for coeffitients of such
approximation (c1\, c2 and b) - they can be calculated as a solution of s
ystem equations just the same as Yule–Walker system of equations. To fin
d the initial conditions (X0 and X1) it is nessesary to solve the system o
f two linear equations based on recurrently calculated values A(j)\, B(j)
and C(j): \nFor j=0 A(0) = 0\, B(0) = 1\, C(0) = 0\; \nFor j = 1\, A(1
) = 1\, B(1) = 0\, C(1)=0\; and for j>=2 as: \nA(j + 1) = с1 • A(j
) + c2 • A(j – 1) \; \nB(j + 1) = с1 • B(j) + c2 • B(j
– 1) \; \nC(j + 1) = с1 • C(j) + c2 • C(j – 1) + b\; where
с1\, c2 and b - primarely finded coeffitients (solution of system of Yul
e–Walker type).\n The proposed approach minimizes the root mean square
(RMS) deviation. The analysis of two possible sources of noncorrect behav
iour of approximating curve was done. The method is tested on some example
s.\n\nhttps://indico.jinr.ru/event/137/contributions/531/
LOCATION:
URL:https://indico.jinr.ru/event/137/contributions/531/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Concept of a cloud service for data preparation and computational
control on custom HPC systems in application to molecular dynamics.
DTSTART;VALUE=DATE-TIME:20170704T113000Z
DTEND;VALUE=DATE-TIME:20170704T114500Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-526@indico.jinr.ru
DESCRIPTION:Speakers: Sergey Markizov (Keldysh Institute of Applied Mathem
atics)\nThe development of computer technology greatly expanded the possib
ilities of computational experiment. At the present stage it is already po
ssible to study the properties and processes in complex systems at the mol
ecular and even atomic level\, for example\, by the means of molecular dyn
amics (MD). The most interesting are problems related with the study of co
mplex processes under real physical conditions. \nSolving such problems re
quires the use of high performance computing systems of various types\, fo
r example\, GRID systems and HPC clusters. For parallel calculations using
the MD methods it is necessary to create an initial structure of computat
ional domain\, which describes the starting conditions\, types and propert
ies of the particles involved in the simulation. \nAlso\, considering long
-time computational tasks\, there is a need for software of automatic moni
toring such tasks and data relocation from HPC to the user storage.\nMost
of these actions today a scientist performs manually.\nAuthors will presen
t the concept and the prototype of cloud service KIAM MolSDAG\, intended f
or design of atomistic systems of large volume for further detailed molecu
lar dynamic calculations. The main objective of the service is to provide
a user the interface for designing an atomistic structure and then the pre
paration of input data for its numerical analysis using a variety of MD si
mulators. The second task of this service is to deploy\, monitor and reloc
ate the calculation-related data on the user-defined HPC system.\nThe indi
vidual elements of the service have already been implemented and confirmed
the effectiveness of the overall service concept.\n\nhttps://indico.jinr.
ru/event/137/contributions/526/
LOCATION: 406B
URL:https://indico.jinr.ru/event/137/contributions/526/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Light ion beams for energy production in accelerator driven system
s
DTSTART;VALUE=DATE-TIME:20170707T124500Z
DTEND;VALUE=DATE-TIME:20170707T130000Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-527@indico.jinr.ru
DESCRIPTION:Speakers: Mihaela Paraipan (Institute of Space Science Buchare
st-Magurele Romania\, Joint Institute for Nuclear Research Dubna Russia)\n
A comparative study of the energy efficiency of proton beams with an energ
y from 0.5 GeV to 4 GeV and light ion beams (7Li\, 9Be\, 11B\, and 12C) wi
th energies from 0.25 AGeV to 1 AGeV in natural and enriched quasi-infinit
e U target is presented. The numerical results on the particle transport a
nd interaction are obtained using the code Geant4. The following target op
timization issues are addressed: the beam window dimensions\, the coolant\
, the possibility to use a core from low Z materials. The best solution fo
r ADS from the point of view of the energy gain and miniaturization is obt
ained for 7Li or 9Be beam with an energy of 0.35 – 0.4 AGeV and a target
with Be core.\n\n1. C. Rubbia et al.\, ” An Energy Amplifier for cleane
r and inexhaustible nuclear energy production driven by a particle beam ac
celerator”. CERN/AT/93-47\, November 1993\n2. Kairat Ismailov\, Masaki S
aito\, Hiroshi Sagara\, Kenji Nishihara\,” Feasibility of uranium spalla
tion target in accelerator-driven system”\, Progress in Nuclear Energy 5
3 (2011) 925-929\n3 Кошкарев Д. Г.\, Соболевский Н.
М.\, Бархударян А. В.\, "Использование элек
троядерного метода в энергетике "\, Атомн
ая Энергия (2008)\, т. 105\, вып. 3\n4. Baldin A. A.\, Berlev
A. I.\, Paraipan M.\, Tyutyunikov S. I.\, Physics of Particles and Nucle
i Letters №1_173\n\nhttps://indico.jinr.ru/event/137/contributions/527/
LOCATION: LIT Conference Hall
URL:https://indico.jinr.ru/event/137/contributions/527/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Optimal approximation of biquartic polynomials by bicubic splines
DTSTART;VALUE=DATE-TIME:20170704T110000Z
DTEND;VALUE=DATE-TIME:20170704T111500Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-528@indico.jinr.ru
DESCRIPTION:Speakers: Csaba Török (Institute of Computer Science\, Facul
ty of Sciencie\, Pavol Jozef Safarik University in Kosice)\nRecently an un
expected approximation property between polynomials of degree three and fo
ur was revealed within a framework of two-part approximation models in 2-n
orm\, Chebyshev norm and Holladay semi-norm. \nNamely\, it was proved that
if a two-component cubic Hermite spline’s first derivative at the share
d knot is computed from the first derivative of a quartic polynomial\, the
n the spline is a clamped spline of class C^2 and also the best approximan
t to the polynomial.\n\nAlthough it was known that a 2x2 component uniform
bicubic Hermite spline is a clamped spline of class C^2 if the\nderivativ
es at the shared knots are given by the first derivative of a biquaartic p
olynomial\, however the optimality of such approximation remained an open
question.\n\nThe paper's goal is to resolve this problem. Unlike the splin
e curves\, in the case of spline surfaces it is insufficient to suppose th
at the grid should be uniform and the spline's derivatives computed from a
biquartic polynomial. We show that the biquartic polynomial coefficients
have to satisfy some additional constraints to achieve optimal approximati
on by bicubic splines.\n\nhttps://indico.jinr.ru/event/137/contributions/5
28/
LOCATION: 406A
URL:https://indico.jinr.ru/event/137/contributions/528/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Generation and analysis of the second order difference scheme for
the Korteveg-de Vries equation
DTSTART;VALUE=DATE-TIME:20170707T114500Z
DTEND;VALUE=DATE-TIME:20170707T120000Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-529@indico.jinr.ru
DESCRIPTION:Speakers: Konstantin Marinov (JINR)\nIn this work we consider
Korteveg-de Vries equation and apply to it our approach based on differenc
e elimination by construction of a Groebner basis. As a result\, we obtain
finite difference approximation with second-order accuracy for the space
and time. This scheme is consistent with Korteveg-de Vries equation and st
able due to it is implicit. Therefore\, our scheme is convergent. We made
comparison\, on the exact soliton solution\, the numerical behavior of sch
eme with that of two known schemes of the same order of approximation and
show that our scheme provides substantially better numerical accuracy.\n\n
https://indico.jinr.ru/event/137/contributions/529/
LOCATION:
URL:https://indico.jinr.ru/event/137/contributions/529/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Modification of Adaptive Artificial Viscosity for Solution of Gasd
ynamic Problems on Parallel Computer Systems
DTSTART;VALUE=DATE-TIME:20170707T080000Z
DTEND;VALUE=DATE-TIME:20170707T081500Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-530@indico.jinr.ru
DESCRIPTION:Speakers: Igor Popov (KIAM RAS)\nIn work the modified method o
f adaptive artificial viscosity so-called AIV method is considered. Earlie
r developed AIV method belongs to schemes a predictor - corrector type. In
the procedure of this method between a predictor and the proofreader ther
e is a stage of definition of areas of physical ruptures of the solution\,
in particular\, of areas of an arrangement of shock waves and numerical o
scillations. In these areas artificial viscosity which provides monotony o
f the numerical decision is entered. At the solution of concrete problems
on parallel computer systems this method demanded unfairly large number of
transfers of data between subareas of computational domain. The modified
AIV method is developed for overcoming this problem. The new variant of th
e AIV method consists of two stages. At the first stage the analysis of th
e numerical solution on the previous temporary layer is made and amendment
s to flows for the purpose of ensuring monotony of the solution are calcul
ated. The second stage is responsible for calculations of all physical qua
ntities on the following temporary layer. The modified AIV method has been
applied to the solution of the equations of gas dynamics in the presence
of shock waves. The carried-out calculations have shown that on a shock wa
ve the quantity of intervals for resolution of her front can increase all
by unit. In other areas\, in particular\, on a depression wave the numeric
al decision even approaches the exact solution of a task closer. Thus\, th
e offered modification doesn't worsen the AIV method\, and at realization
on parallel computer systems significantly reduces the overhead costs conn
ected with introduction of adaptive artificial viscosity.\n\nhttps://indic
o.jinr.ru/event/137/contributions/530/
LOCATION:
URL:https://indico.jinr.ru/event/137/contributions/530/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Generalized Darcy's law in filtration theory
DTSTART;VALUE=DATE-TIME:20170706T110000Z
DTEND;VALUE=DATE-TIME:20170706T111500Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-532@indico.jinr.ru
DESCRIPTION:Speakers: Natalya Semenova (Peoples' Friendship University of
Russia)\, Yuri Rybakov (Peoples'Friendship University of Russia)\nGENERALI
ZED DARCY’S LAW IN FILTRATION THEORY\n\nYu.P. Rybakov and N.V. Semenova\
nDepartment of Theoretical Physics and Mechanics\nPeoples’ Friendship Un
iversity of Russia\n117198 Moscow\, 6\, Miklukho-Maklay str\, Russia\nE-ma
il: soliton4@mail.ru\n\nWe study the hydrodynamics of flow in porous mediu
m modeling the grain filling in filters. Using the lattice approximation\,
we derive the structure of the current in porous medium and obtain the tr
ansverse diffusion coefficient which proves to be proportional to the di
ameter d of the grain. We consider the axially-symmetric stationary flow w
ith the velocity components in cylindrical coordinates The current dens
ity of the liquid takes the form\n \nwith the
density of the liquid being unit. Solving the corresponding continuity equ
ation and neglecting the radial velocity one can explain the so-called
“near-wall” effect for the case of cylindrical filter\, resulting in l
arge value of velocity near the wall [1] of the filter tube. \n To find
the profiles of the velocity and the pressure p\, it is necessary to sol
ve also the Euler equation\n \nwhere the force d
ensity includes the gravity acceleration and the Darcy’s force In
the simplest approximation the Darcy’s coefficient appears to be const
ant: but in general it should be some function of the velocity and press
ure. We suggest a generalization of the Darcy’s law by including in th
e natural invariant in the simplest linear form: We analyze the depend
ence of the filtration process on the coefficient \n\nReferences\n[1] Yu.
P. Rybakov\, G.N. Shikin\, Proceedings of the 16th International Confere
nce “Mathematical Methods in Techniques and Technologies(MMTT-16\, St-Pe
tersburg)”\, 1(2003) 138-139.\n\nhttps://indico.jinr.ru/event/137/contri
butions/532/
LOCATION: 406A
URL:https://indico.jinr.ru/event/137/contributions/532/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Partial spectroscopy of alpha-rhythm and pathological activity of
the human brain
DTSTART;VALUE=DATE-TIME:20170704T123000Z
DTEND;VALUE=DATE-TIME:20170704T124500Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-533@indico.jinr.ru
DESCRIPTION:Speakers: Stanislav Rykunov (Institute of Mathematical Problem
s of Biology RAS - the Branch of Keldysh Institute of Applied Mathematics
of Russian Academy of Sciences)\nThe new method to study human brain activ
ity was developed [1]. This method aims to determine spectral characterist
ics\, specific to various regions and structures of the human brain. Said
method combines two completely different sources of information: 1) anatom
ical information\, obtained from magnetic resonance imaging(MRI)\; 2) info
rmation about human brain activity\, obtained by multichannel magnetic enc
ephalograph. To find activity sources from magnetoencephalogram functional
tomography method is used [2]. Functional tomography finds corresponding
unique spatial location for each coherent elementary oscillation. Spatial
information about regions of interest(ROI) is extracted from MRI either by
semi-automatic segmentation\, or by direct selection. Combining these ROI
s with functional tomogram one can obtain set of the field sources\, corre
sponding to selected ROI. Frequencies and Fourier coefficients of these so
urces form partial spectrum of the studied region or structural element of
the human brain. From this partial spectrum\, multichannel time-series ca
n be reconstructed\, thus giving us partial encephalogram\, produced by re
gion of interest. Further analysis of such encephalograms can be used to d
etermine connectivity between different regions and structures of the brai
n.\nFor verification\, the method was applied to the records of the human
brain spontaneous activity obtained from healthy subjects and from subject
s with certain pathologies (multiple sclerosis and neuralgias of different
genesis). The results obtained show good correlation with the generally a
ccepted ideas about the localization of sources of such activity.\n\n1. Ry
kunov S.D.\, Ustinin M. N.\, Polyanin A. G.\, Sychev V. V.\, Llinás R. R
. Software for the partial spectroscopy of human brain\, Mat. Biolog. Bioi
nform. 2016\, V. 11\, I.1\, P. 127–140 doi: 10.17537/2016.11.127\n2. Ll
inás R.R.\, Ustinin M.N.\, Rykunov S.D.\, Boyko A.I.\, Sychev V.V.\, Wal
ton K.D.\, Rabello G.M. and Garcia J. Reconstruction of human brain sponta
neous activity based on frequency-pattern analysis of magnetoencephalograp
hy data. Frontiers in Neuroscience. 2015. V. 9. P. 373. doi: 10.3389/fnins
.2015.00373.\nThis work was partially supported by the Russian Foundation
for Basic Research (grants 16-07-00937\, 16-07-01000\, 17-07-00677\, 17-07
-00686)\, by the Program I.33P for Fundamental Research of the Russian Aca
demy of Sciences\, and by the CRDF Global (USA) (grants CRDF RB1-2027 and
RUB-7095-MO-13).\n\nhttps://indico.jinr.ru/event/137/contributions/533/
LOCATION: LIT Conference Hall
URL:https://indico.jinr.ru/event/137/contributions/533/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Modeling of charge dynamics in homogeneous chain with defect
DTSTART;VALUE=DATE-TIME:20170704T114500Z
DTEND;VALUE=DATE-TIME:20170704T120000Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-534@indico.jinr.ru
DESCRIPTION:Speakers: Nadezhda Fialko (Institute of Mathematical Problems
of Biology RAS – the Branch of Keldysh Institute of Applied Mathematics
of Russian Academy of Sciences)\nVarious results of numerous biophysical e
xperiments on charge transfer along DNA fragment have demonstrated that di
fferent transport mechanisms are possible in DNA. The transfer rate depend
s not only on the length of the chain along which the transfer occurs\, bu
t also on its sequence [1].\n\nWe have studied the simple $1D$-model based
on the semi-classical Holstein Hamiltonian for a discrete chain of sites
(for DNA sequence\, the site is a complementary base pair) with temperatur
e T (Langevin-type equations). Recently\, using the computer simulation\,
it has been shown that the charge distribution in homogeneous chains in th
ermodynamic equilibrium (TDE) depends not only on the temperature\, but al
so on the length of the chain.\nWhen the energy of the classical chain Ecl
= Nk_BT (N is the length of the chain) is less than the critical value E*
\, the charge is in the polaron state. When Ecl > E*\, the charge is in a
delocalized state [2].\n\nFor homogeneous DNA fragments\, in TDE the polar
on state exists at low temperatures\, less than 5 Debye temperature\, belo
w which the semiclassical approximation is inapplicable. We have investiga
ted the TDE states in the case when a trap-site with negative electron ene
rgy is placed in the middle of a homogeneous chain. Computational experime
nts were carried out for parameters corresponding to polyA fragments. \n\n
A qualitative picture of the total energy E\, averaged by set of samples\,
for homogeneous chain with a trap is the same as for the chain without de
fect. The temperature stability of polarons in a chain with trap-site incr
eases in comparison with the case of a homogeneous chain. For oligonucleot
ide AAAAGAAAAA (N = 10)\, the critical temperature T*~E*/N ~ 400 K is in t
he region of biological temperatures\, and for the 40-site chain of adenin
e with guanine in the center T* <175 K.\n\nThe simulation results demonstr
ate that as the length of the chain increases\, the type of charge distrib
ution changes. In short chains\, the charge is in the polaron state\, and
its transfer occurs slowly by hopping mechanism [3]. In long chains at the
same temperature\, the charge is in delocalized state\, and the transfer
process is more rapid.\n\nThis work is partially supported by Russian Foun
dation for Basic Research\, grants no. 16-07-00395\, 17-07-00801\, and Rus
sian Science Foundation\, project 16-11-10163.\n\nhttps://indico.jinr.ru/e
vent/137/contributions/534/
LOCATION: LIT Conference Hall
URL:https://indico.jinr.ru/event/137/contributions/534/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Usage Power Geometry and Normal Form Methods in simulation of dege
nerated nonlinear ODEs study
DTSTART;VALUE=DATE-TIME:20170706T080000Z
DTEND;VALUE=DATE-TIME:20170706T083000Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-535@indico.jinr.ru
DESCRIPTION:Speakers: Victor Edneral (Lomonosov Moscow State University)\n
The report describes power transformations of degenerate autonomic polynom
ial systems of ordinary differential equations which reduce such systems t
o a set of non-degenerate systems. The original problem is separated in a
number of partial nilpotent tasks. \n\nThere is an example of building ex
act first integrals of motion of a degenerate planar system in a closed fo
rm as functions of system parameters.\n\nJoint work with Profs. Alexander
Bruno and Valery Romanovski\n\nhttps://indico.jinr.ru/event/137/contributi
ons/535/
LOCATION: LIT Conference Hall
URL:https://indico.jinr.ru/event/137/contributions/535/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Entanglement and quantum state transfer in spin chains with XY-Ham
iltonian
DTSTART;VALUE=DATE-TIME:20170706T130000Z
DTEND;VALUE=DATE-TIME:20170706T131500Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-536@indico.jinr.ru
DESCRIPTION:Speakers: Elena Kuznetsova (Institute of Problems of Chemical
Physics of RAS)\, Ilya Lazarev (MSU\, Faculty of Fundamental Physical and
Chemical Engineering)\nE.I.Kuznetsova¹\, I.D.Lazarev²˒¹\n\n1Institute
of Problems of Chemical Physics of RAS\, Chernogolovaka\, 142432\,Moscow
Region\, Russia\n2Lomonosov Moscow State University\, Faculty of Fundament
al Physical and Chemical Engineering\, 119991\, Moscow\, Russia\nWe invest
igate quantum state transfer [1] and quantum entanglement [2]\, emerging i
n this process\, in spin chains. We consider a quantum system\, consisting
of N spins\, connected by the XY-Hamiltonian in the approximation of the
nearest neighbor interactions [3]. Initially the spin chain is in the the
rmodynamic equilibrium state. Magnetic resonance methods allow us to creat
e a pure state of the first chain spin\, which is called the sender. As a
result of the evolution under the action of the XY-Hamiltonian\, the pure
quantum state transmits along the chain to its end. The last chain spin
is called the receiver. A quality of the quantum state transfer is estima
ted by fidelity [4] \n
F=
(1) \nwhere |ψ>=a|0>+b
|1> is the transmitted quantum state (a\, b are complex numbers\, |a|²+|
b|²=1)\, χ is the reduced density matrix over all spins besides the rec
eiver. We evaluate analytically a quality of the transferred state with fi
delity between the sender state and the receiver one. \nWe found also that
the quantum entanglement between the sender and the receiver emerges in
the transmission process. We investigate numerically the dependencies of e
ntanglement on parameter |b| and the temperature by simulations with the
computational program “Mathematica”. We use concurrence [5] for the e
stimation of quantum entanglement in the system. We found the critical te
mperature of emerging entanglement. We established that the critical tempe
rature depends on the polarization of the initial pure state. It is shown
that the critical temperature decreases with increasing parameter |b| at
small |b|. However\, the critical temperature increases with increasing |
b| at large values of |b|. A break point between regions of increasing a
nd decreasing the critical temperature does not depend on the number N of
spins in the chain. \nTime of emerging entanglement grows with increasing
N in the considered quantum system. \n\n The work is supported by Russ
ian Foundation of Basic Research (Grants Nos. 15-07-07928 and 16-03-00056
) and the Program of RAS “Element base of quantum computers” (Grants N
o. 0089-2015-0220).\n\n1. S. Bose. “Quantum Communication through an Unm
odulated Spin Chain”\, Phys. Rev. Lett.\, 91\, 207901\, 2003.\n2. Einst
ein A\, Podolsky B\, Rosen N. “Can Quantum-Mechanical Description of Phy
sical Reality Be Considered Complete?” Phys. Rev. 47\, 777–780\, 1935
.\n3. E.B. Fel’dman\, E.I. Kuznetsova\, and A.I. Zenchuk. “Temperature
-dependent remote control of polarization and coherence intensity with sen
der's pure initial state”. Quantum Information Processing\, Vol. 15\, Is
sue 6\, pp. 2521-2552\, 2016.\n4. R. Jozsa. “Fidelity for Mixed Quantum
States”. Journal of Modern Optics\, 41\, pp. 2315-2323\, 1994.\n5. S.
Hill and W.K. Wootters. “Entanglement of a Pair of Quantum Bits”. Phys
. Rev. Lett.\, 78\, 5022\, 1997.\n\nhttps://indico.jinr.ru/event/137/contr
ibutions/536/
LOCATION: LIT Conference Hall
URL:https://indico.jinr.ru/event/137/contributions/536/
END:VEVENT
BEGIN:VEVENT
SUMMARY:DDS – The Dynamic Deployment System
DTSTART;VALUE=DATE-TIME:20170706T131500Z
DTEND;VALUE=DATE-TIME:20170706T133000Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-537@indico.jinr.ru
DESCRIPTION:Speakers: Andrey Lebedev (GSI\, Darmstadt / JINR\, Dubna)\nThe
Dynamic Deployment System (DDS) is a tool-set that automates and signific
antly simplifies a deployment of user-defined processes and their dependen
cies on any resource management system (RMS) using a given topology.\n\nA
number of basic concepts are taken into account in DDS. Namely\, DDS imple
ments a single responsibility principle command line tool-set and APIs. Th
e system treats users’ tasks as black boxes – they can be executables
and scripts. DDS doesn’t depend on RMS and provides deployment via SSH\,
when no RMS is present. It doesn’t require pre-installation and pre-con
figuration on the worker nodes. DDS deploys private facilities on demand w
ith isolated sandboxes. The system provides a key-value property propagati
on service for tasks. DDS provides a rule-based execution of tasks.\n\nIn
this report detailed description\, current status and future developments
of the DDS will be presented.\n\nhttps://indico.jinr.ru/event/137/contribu
tions/537/
LOCATION:
URL:https://indico.jinr.ru/event/137/contributions/537/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Analisys of the Distribution of the Beam in Particle Accelerators
DTSTART;VALUE=DATE-TIME:20170706T124500Z
DTEND;VALUE=DATE-TIME:20170706T130000Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-608@indico.jinr.ru
DESCRIPTION:Speakers: Nataliia Kulabukhova (Saint Petersburg State Univers
ity)\nIn particle accelerator physics the problem is that we can not see w
hat is going on inside the working machine. There are a lot of packages fo
r modelling the behaviour of the particles in numerical or analytical way.
The idea is to provide scientists with a problem-solving environment\, wh
ich can not only do some numerical calculations\, but show the changes of
the particle distribution as a motion 3D picture.\n\nhttps://indico.jinr.
ru/event/137/contributions/608/
LOCATION:
URL:https://indico.jinr.ru/event/137/contributions/608/
END:VEVENT
BEGIN:VEVENT
SUMMARY:MECHANISM OF CONTROLLING THE PROCESS OF THE CONVERGENCE OF THE NEW
TON ITERATION METHOD
DTSTART;VALUE=DATE-TIME:20170706T104500Z
DTEND;VALUE=DATE-TIME:20170706T110000Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-538@indico.jinr.ru
DESCRIPTION:Speakers: Dmitrii Kazakov (Dubna State University)\nA mechanis
m for controlling the convergence of the continuous analog of the Newton m
ethod (NAMN) with the use\, as a control parameter\, of the step variation
coefficient of the difference scheme for the numerical solution of the di
fferential equation of the NAMN. Using the example of a developed algorith
m for a modified NAMN\, it was shown that it is possible to control the ch
aracteristics of the convergence of NAMN using the step change coefficient
of the difference scheme for the numerical solution of the differential e
quation of the NAMN as a control parameter. The development and implementa
tion of mechanisms for controlling the iterative processes of solving the
equations will make it possible to significantly reduce the time required
to calculate the required value\, which will significantly improve the eff
iciency of the algorithms for solving nonlinear equations.\n\nReferences \
n1.E.G. Nikonov. One class of conservative difference schemes for solving
molecular dynamics equations of motion. arXiv:1605.05714v1 [math.NA].\n2.
Gavurin M.K. Nonlinear functional equations and continuous analogues of it
erative methods [Text]: Izv. Higher education \\ Gavurin M.K. - Mat.\, No.
5\, 18-31 (1958).\n3. T. Zhanlav\, I. V. Puzynin. On the convergence of i
terations on the basis of the continuous analogue of Newton's method\, ZhV
MiMF.\, 1992\, vol. 32\, no. 6\, 846-856.\n4. N. N. Kalitkin. Numerical me
thods. Moscow: Science\, 1978.\n\nhttps://indico.jinr.ru/event/137/contrib
utions/538/
LOCATION: 406A
URL:https://indico.jinr.ru/event/137/contributions/538/
END:VEVENT
BEGIN:VEVENT
SUMMARY:On the Wigner quasiprobability function for N-level quantum syste
ms
DTSTART;VALUE=DATE-TIME:20170706T131500Z
DTEND;VALUE=DATE-TIME:20170706T133000Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-539@indico.jinr.ru
DESCRIPTION:Speakers: Vahagn Abgaryan (JINR LTP)\nAccording to the Straton
ovich-Weyl correspondence there is mapping between\noperators on the Hilbe
rt space of a finite-dimensional quantum system and functions on the phase
space of its classical mechanical counterpart. This map is given by the W
igner quasiprobability distribution and can be implemented with the aid of
the Stratonovich–Weyl operator kernel which satisfies a number of lucid
physical postulates. In the present report\, applying this formulation to
a generic N-level quantum system\, we propose the k-fold family of Wigner
functions defined on the complex flag manifolds F_N^N-k : = U(N)/(U(N-k)
×U(k)) with k ≤ [(N-1)/2] and present explicit expressions for kernels
of few low-dimensional Wigner function.\n\nhttps://indico.jinr.ru/event/13
7/contributions/539/
LOCATION: LIT Conference Hall
URL:https://indico.jinr.ru/event/137/contributions/539/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Modeling the quarks' helicity flipping stimulated by their confine
ment potential
DTSTART;VALUE=DATE-TIME:20170703T130000Z
DTEND;VALUE=DATE-TIME:20170703T131500Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-541@indico.jinr.ru
DESCRIPTION:Speakers: Boris Kostenko (JINR)\nThe proton spin puzzle is kno
wn since 1988 after measurements of\nquarks' helicity contribution to the
proton spin [1]. In\nspite of all efforts applied\, the problem remains an
unresolved\nenigma of high-energy physics till now (see [2] and\nreferenc
es therein). It has been recently shown that the confinement\nof quarks in
duces a change of their helicities together with a\nsimultaneous alteratio
n of orbital momenta\, so that the total\nangular momentum of each quark i
s conserved [3]. As a\nnecessary consequence\, a superposition of states w
ith opposite\nhelicities of quarks should appear. Thus\, contribution of q
uarks\nhelicities to the proton polarization may be much less than it is\n
expected on the ground of the conventional picture of entirely free\nparto
ns. In principle\, this mechanism might be considered as a\nsolution to th
e proton spin puzzle.\n\nIn present communication\, such a scenario is ver
ified on basis of\nthe Dirac equation written in the cylindrical coordinat
es. Firstly\na resulting system of differential equations was tried to be
solved\nnumerically with MAPLE assisted standard methods such as\nRunge-
Kutta-Fehlberg algorithm (the rkf45 procedure) and a\nfinite difference t
echnique with the Richardson extrapolation (the\n bvp procedure). Unfortun
ally\, none of them was able to\nreproduce the confinement of quarks in th
e usual linearly increasing\nattractive potential. A method of numerical
solution of the system\ndescribing the quarks' helicity flipping as well a
s their\nconfinement is proposed in this report.\n\nReferences\n\n[1]EMC\,
J. Ashman et al.\, Phys. Lett. B {\\bf 206}\, 364 (1988)\n\n[2]PHENIX\, A
. Adare\, et al.\, Phys. Rev. D {\\bf 93}\, 011501(R)\n(2016)\n\n[3]B. Kos
tenko\, Europ. Phys. J.\, EPJ Web of Conferences {\\bf 138}\,\n8009 (2017)
\n\nhttps://indico.jinr.ru/event/137/contributions/541/
LOCATION: 406A
URL:https://indico.jinr.ru/event/137/contributions/541/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Mathematical modeling of air pollution and the frequency of respir
atory diseases among the population of the city of Ulaanbaatar
DTSTART;VALUE=DATE-TIME:20170704T130000Z
DTEND;VALUE=DATE-TIME:20170704T131500Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-542@indico.jinr.ru
DESCRIPTION:Speakers: Budnyam Sanjaa (professor of IM\, NUM)\nIn this repo
rt we considered research results based on mathematical modeling approach
to estimating and forecasting health indicators of population of Ulaanbaat
ar city from influenced of air pollution distribution in the atmosphere. \
nIn particular of the research\, the present situation of air pollution so
urces in the districts on UB’s have been broadly reviewed and health imp
act analysis how it’s influenced for health of 0-14\, 15-60\, over old p
erson’s ability to breath. The main sources of air pollution in UB\, in
no particulate order\, include ger district\, blast-furnace of low pressur
e\, power plants\, means of transports. We forecasting that reduction of a
ir pollution from this main sources by 10\, 20\, 30 per should decrease il
lness respiratory way. \n\nKey: ecology\, mathematical modeling\, forecast
ing\, innovation\n\nhttps://indico.jinr.ru/event/137/contributions/542/
LOCATION: 310
URL:https://indico.jinr.ru/event/137/contributions/542/
END:VEVENT
BEGIN:VEVENT
SUMMARY:MINIMUM PERIOD OF ROTATION OF MILLISECOND PULSARS AND EQUATIONS OF
PULSAR MATTER STATE
DTSTART;VALUE=DATE-TIME:20170704T104500Z
DTEND;VALUE=DATE-TIME:20170704T110000Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-547@indico.jinr.ru
DESCRIPTION:Speakers: Sergey Mikheev (Tver State University)\nThe astrophy
sical data is indicative of the presence of a minimum period of rotation o
f millisecond pulsars. Now this period is 1.396648 ms.At that\, the indica
ted value is reached long before pulsar destruction under the influence of
centrifugal forces. This phenomenon is easily explained by the fast growt
h of angular momentum losses near the bifurcation point of pulsar configur
ation due to intense pulsar gravitational radiation.\nBased on the finding
s of our previous studies of fast-rotating Newtonian magnetized polytropie
s\, we found the relation between a minimum pulsar rotation period\, a val
ue of pulsar central density\, and a polytropy index. Due to this relation
we drawn a conclusion that a value of minimum central density of a pulsar
with a peak period was 2.5088·1014 g/cm3.\n\nhttps://indico.jinr.ru/even
t/137/contributions/547/
LOCATION: 406A
URL:https://indico.jinr.ru/event/137/contributions/547/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Computer algebra algorithms of simplification of tensor expression
s
DTSTART;VALUE=DATE-TIME:20170707T124500Z
DTEND;VALUE=DATE-TIME:20170707T130000Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-637@indico.jinr.ru
DESCRIPTION:Speakers: Alexander Kryukov (SINP MSU)\nWill be presented the
computer algebra algorithms of simplification of tensor expressions which
based on group-theoretical properties of tensor monoms and multilinear ide
ntities like Bianchi.\n\nhttps://indico.jinr.ru/event/137/contributions/63
7/
LOCATION:
URL:https://indico.jinr.ru/event/137/contributions/637/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Near-perfect matchings on cylinders $C_m \\times P_n$ of odd order
DTSTART;VALUE=DATE-TIME:20170707T103000Z
DTEND;VALUE=DATE-TIME:20170707T104500Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-543@indico.jinr.ru
DESCRIPTION:Speakers: Sergey Perepechko (Petrozavodsk State University)\n\
\documentclass[12pt]{article}\n \\usepackage{amssymb}\n \\sloppy\n \\paper
width=210mm\n \\paperheight=297mm\n \\textheight=250mm\n \\textwidth=165mm
\n \\oddsidemargin=-0.4mm\n \\evensidemargin=-5.4mm\n \\topmargin=-5.4mm\n
\n\\begin{document}\n\\begin{center}\nNear-perfect matchings on cylinders
$C_m \\times P_n$ of odd order\n\\end{center}\nAbstract:\\\\\nThe problem
of counting near-perfect matchings on cylinders $C_m \\times P_n$ is\ndisc
ussed when both parameters $m$ and $n$ are odd. A distinctive feature of \
nthese matchings is the presence of exactly one node which is left unmatch
ed.\nThis node will be called vacancy.\n\nThis combinatorial problem is di
rectly related to the dimer problem\, one of the\nclassical lattice models
of statistical physics. If at least one of the \nlattice parameters is ev
en\, then maximum matchings often turn out to be perfect\nmatchings. But i
f the order of the graph is odd\, then maximum matchings are \nusually nea
r-perfect matchings. The generating function for the number of \nnear-perf
ect matchings is identical to generating function for the dimer model\nwhe
n activities of all dimers are the same.\n\nThe methods known to date are
able to find closed-form expressions for the \nnumber of near-perfect matc
hings on $C_m \\times P_n$ graphs only when the vacancy\nis located on the
boundary~\\cite{Wu1}. Summation over all possible vacancy locations\nfor
arbitrary values of parameters $m$ and $n$ is beyond the scope of availabl
e \nanalytical tools.\n\nIn our work\, a counting problem is considered fo
r a fixed value of the parameter\n$m$. Under this condition\, generating f
unctions $G_m^P(z)$ for the number of \nperfect matchings in the graphs $C
_m \\times P_{2n}$ and $G_m^N(z)$ for the number\nof near-perfect matching
s in the graphs $C_m \\times P_{2n+1}$ are rational. These\ngenerating fun
ctions can be reconstructed from sufficiently long initial segments\nof se
quences\, the elements of which are numbers of near-perfect matchings in g
raphs\nfor fixed values of $m$ and changing $n$.\n\nThe implementation of
the method by Wilf~\\cite{Wilf1} in computer algebra system\nMaple allowed
us to obtain a set of recurrence relations and generating functions\nfor
the number of near-perfect matchings for fixed odd values of the parameter
\n$3 \\leqslant m \\leqslant 13$. The coefficients of the asymptotic expan
sions are\ncalculated for $3 \\leqslant m \\leqslant 19$.\n\nThe study of
generating functions $G_m^N(z)$ made it possible to establish a\nclose con
nection between their denominators and the denominators $G_m^P(z)$. For\na
ll values of $m$ studied in our research\, the denominator $G_m^N(z)$ had
been \nalways the square of the denominator $G_m^P(z)$.\n% ---------------
------------------------------\n\\begin{thebibliography}{9}\n%References\\
\\\n\\bibitem{Wu1}\nF. Y. Wu\, Wen-Jer Tzeng and N. Sh. Izmailian\, Physic
al Review E 83\, 011106\, (2011).\n\\bibitem{Wilf1}\nH. S. Wilf\, Journal
of Combinatorial Theory\, 4\, 246--258\, (1968).\n\\end{thebibliography}\n
% ---------------------------------------------\n\\end{document}\n\nhttps:
//indico.jinr.ru/event/137/contributions/543/
LOCATION: 310
URL:https://indico.jinr.ru/event/137/contributions/543/
END:VEVENT
BEGIN:VEVENT
SUMMARY:GPU simulations of blood flow in CT based domains
DTSTART;VALUE=DATE-TIME:20170703T140000Z
DTEND;VALUE=DATE-TIME:20170703T143000Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-544@indico.jinr.ru
DESCRIPTION:Speakers: Ivan Georgiev (IICT&\;IMI-BAS)\nArterial aneurysm
s are dilations of arterial walls that can grow over time and\, in case of
rupture leads to dangerous hemorrhage. \nComputer simulations of the bloo
d flow and its interaction with the surrounding vessel tissue enables phys
icians to estimate rupture \nrisks by calculating the distribution of bloo
d pressure\, velocity and wall stresses in the aneurysm\, in order to supp
ort the planning of clinical interventions. \nFor the numerical simulatio
n\, the computational domain is extracted from medical image data of the p
atient's vascular system. The blood is modeled as an incompressible Newton
ian fluid\, and the surrounding vessel wall as an isotropic linear elastic
material. \nBoth the Navier-Stokes equations for the fluid domain and the
Navier-Lame equations for the solid domain are handled with a finite elem
ent method\, and the resulting linear equation systems are solved via and
algebraic multigrid algorithm. Implicit coupling between blood flow and wa
ll elasticity is achieved using an iterative fluid-structure interaction t
echnique deforming the fluid mesh according to the wall displacement in ea
ch step. For the efficient solution of the resulting large-scale problem\,
we exploit efficient numerical methods and high performance computing on
advanced heterogeneous CPU-GPU parallel architectures.\n\nhttps://indico.j
inr.ru/event/137/contributions/544/
LOCATION:
URL:https://indico.jinr.ru/event/137/contributions/544/
END:VEVENT
BEGIN:VEVENT
SUMMARY:An application of geometric methods to the one-step processes stoc
hastization
DTSTART;VALUE=DATE-TIME:20170707T123000Z
DTEND;VALUE=DATE-TIME:20170707T124500Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-545@indico.jinr.ru
DESCRIPTION:Speakers: Dmitry Kulyabov (PFUR & JINR)\nWhen modeling differe
nt physical and technical systems\, they can often be modeled in the form
of one-step processes. Our group has been developing a formalism of stocha
stization of one-step processes for quite a long time. We investigated a v
ariety of representations of both the one-step processes\, and methods of
their stochastization. We have considered representations in the state vec
tors (combinatorial approach) and in the occupation numbers (operator appr
oach) [1]. With stochastization of systems with control\, we use a geometr
ic approach to control theory. It would be useful to consider the geometri
c approach also to the methods of stochastization of one-step processes.\n
\nWe have considered various variants of geometrization of the process of
stochastization of one-step processes and stochastic differential equation
s. Approaches were considered both on the basis of Riemannian quadratic me
trics [2-3] and on the basis of a more general approach of Finsler geometr
y [4-8].\n\nDifferent approaches to geometrization of stochastic systems a
re considered in the paper and comparison with other methodological approa
ches is made.\n\nThe work is partially supported by RFBR grants No's 15-07
-08795 and 16-07-00556. Also the publication was financially supported by
the Ministry of Education and Science of the Russian Federation (the Agree
ment No 02.A03.21.0008).\n\nReferences\n\n1. M. Hnatič\, E. G. Eferina\,
A. V. Korolkova\, D. S. Kulyabov\, L. A. Sevastyanov\, Operator Approach t
o the Master Equation for the One-Step Process\, EPJ Web of Conferences 10
8 (2016) 02027. arXiv:1603.02205\, doi:10.1051/epjconf/201610802027.\n\n2.
Graham\, R.\, 1977. Covariant formulation of non-equilibrium statistical
thermodynamics. Zeitschrift für Physik B Condensed Matter and Quanta 26\,
397–405. doi:10.1007/BF01570750\n\n3. Graham\, R.\, 1977. Path integral
formulation of general diffusion processes. Zeitschrift für Physik B Con
densed Matter and Quanta 26\, 281–290. doi:10.1007/BF01312935\n\n4. Asan
ov\, G.S.\, 1985. Finsler Geometry\, Relativity and Gauge Theories. Spring
er Netherlands\, Dordrecht. doi:10.1007/978-94-009-5329-1\n\n5. Rund\, H.\
, 1959. The Differential Geometry of Finsler Spaces. Springer Berlin Heide
lberg\, Berlin\, Heidelberg. doi:10.1007/978-3-642-51610-8\n\n6. Antonelli
\, P.L.\, Ingarden\, R.S.\, Matsumoto\, M.\, 1993. The Theory of Sprays an
d Finsler Spaces with Applications in Physics and Biology\, Fundamental Th
eories of Physics. Volume 58. Springer Netherlands\, Dordrecht. doi:10.100
7/978-94-015-8194-3\n\n7. Antonelli\, P.L.\, Miron\, R. (Eds.)\, 1996. Lag
range and Finsler Geometry\, Fundamental Theories of Physics . Volume 76.
Springer Netherlands\, Dordrecht. doi:10.1007/978-94-015-8650-4\n\n8. Anto
nelli\, P.L.\, Zastawniak\, T.J.\, 1999. Fundamentals of Finslerian Diffus
ion with Applications\, Fundamental Theories of Physics. Volume 101. Sprin
ger Netherlands\, Dordrecht. doi:10.1007/978-94-011-4824-5\n\nhttps://indi
co.jinr.ru/event/137/contributions/545/
LOCATION:
URL:https://indico.jinr.ru/event/137/contributions/545/
END:VEVENT
BEGIN:VEVENT
SUMMARY:CUNNINGHAM NUMBERS IN ACCELERATED MODULAR ARITHMETIC AND APPLICATI
ONS
DTSTART;VALUE=DATE-TIME:20170706T104500Z
DTEND;VALUE=DATE-TIME:20170706T111500Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-546@indico.jinr.ru
DESCRIPTION:Speakers: Eugene Zima (Physics and Computer Science Department
\, Wilfrid Laurier University\, Waterloo\, Canada)\nFor certain modular al
gorithms\, the modulus need not be a prime\, and implementers are left wit
h more freedom to choose moduli. One suggestion\, made by Knuth [3]\, is t
o use integers of the form A similar choice is Numbers of these forms ar
e Cunningham numbers for the special case of the base We discuss suitabi
lity of these types of moduli for standard computer algebraic modular algo
rithms. Different schemes of choice of these types of moduli are analyzed
along with algorithms for conversion of arbitrary precision integers into
the modular representation. In particular\, this leads to division free li
near time conversion to modular representation\, and multiplication free r
econstruction of the result from modular images. Experimental implementati
on of the described algorithms along with applications in multi-precision
linear algebra and evaluation of rapidly convergent hypergeometric series
are discussed. For very high bit lengths\, over 10 000 bits\, a modular re
presentation using these Cunningham moduli outperforms both the standard b
inary representation as well as a modular representation using small prime
moduli.\n\nReferences\n1. Garner H. The Residue Number System // IRE T
ransactions no Electronic Computers. Vol. 8. 1959. Pp. 140-147.\n2. Ged
des K.O.\, Czapor S.R.\, Labahn G. Algorithms for Computer Algebra (6th pr
inting). – Boston: Kluwer Academic. 1992.\n3. Knuth D.E. The Art of C
omputer Programming\, Vol 2.\n4. Křížek M.\, Luca F.\, Somer L. 17 L
ectures on Fermat Numbers: From Number Theory to Geometry. – New York: S
pringer. 2001.\n\nhttps://indico.jinr.ru/event/137/contributions/546/
LOCATION: LIT Conference Hall
URL:https://indico.jinr.ru/event/137/contributions/546/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Lattice study of effective gluon mass at various boundary conditio
ns
DTSTART;VALUE=DATE-TIME:20170703T111500Z
DTEND;VALUE=DATE-TIME:20170703T113000Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-560@indico.jinr.ru
DESCRIPTION:Speakers: Igor Bogolubsky (JINR\, Dubna)\nWe extract effective
gluon mass from zero-momentum gluon correlators in the SU(2) lattice Quan
tum Chromodynamics (QCD). Lattice simulations of these correlators have be
en done both for (i) periodic and (ii) so-called "open" boundary condition
s. We found that\nthe results for effective mass obtained in cases (i) and
(ii) get closer when the lattice size increases. Nonzero effective gluon
mass found for zero-momentum gluon correlators can be viewed as additional
confirmation of "decoupling"\, or "massive"\, solution found in lattice s
imulations of momentum-dependent gluon correlators\, accomplished both in
SU(2) and SU(3) QCD.\n\nhttps://indico.jinr.ru/event/137/contributions/560
/
LOCATION: 310
URL:https://indico.jinr.ru/event/137/contributions/560/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Joint analytical and numerical investigation of blow-up in some ma
thematical models
DTSTART;VALUE=DATE-TIME:20170704T114500Z
DTEND;VALUE=DATE-TIME:20170704T120000Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-548@indico.jinr.ru
DESCRIPTION:Speakers: Alexander Panin (Lomonosov MSU\, faculty of physics\
, chair of mathematics)\nIn some models (for example\, in plasma physics a
nd semiconductor physics)\, the blow-up phenomenon occurs\, i. e. the solu
tion's norm tends to infinity as time tends to a finite moment. There exis
t some methods to detect blow-up analytically: Pokhozhaev and Mitidieri's
test function method\, Levine's method\, and Samarskii and Galaktionov's s
imilarity solutions method. These methods typically provide us with an est
imation of the blow-up moment. The numerical algorithm (based on N. N. Kal
itkin and co-authors' ideas)\, however\, allows us to specify the moment a
nd the process of the solution’s blow-up by using Richardson's effective
accuracy order. In particular\, one can obtain the blow-up moment with th
e accuracy up to mesh interval. Some numerical experiments will be present
ed in order to demonstrate the effectiveness of the method.\n\nhttps://ind
ico.jinr.ru/event/137/contributions/548/
LOCATION: 406A
URL:https://indico.jinr.ru/event/137/contributions/548/
END:VEVENT
BEGIN:VEVENT
SUMMARY:SIMULATING FLUID FLOW WITH COMPLEX PHYSICS IN ARBITRARY SHAPED DOM
AINS BY CFD CODE FLOWVISION
DTSTART;VALUE=DATE-TIME:20170703T114500Z
DTEND;VALUE=DATE-TIME:20170703T120000Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-549@indico.jinr.ru
DESCRIPTION:Speakers: A Aksenov (TESIS Ltd\, Moscow\, Russia)\nFlowVision
software is designed for automation of engineering calculations in industr
ial computational fluid dynamics (CFD). It has a capability to solve compl
ex non-tradition problems involving different physical processes. The para
digm of complete automation of labor-intensive and time-taking processes l
ike grid generation makes FlowVision attractive for many engineers. FlowVi
sion includes an advanced graphical interface\, the system for specifying
a computational project as well as the system for flow visualization by di
fferent methods – from planar to volume visualization.\nThe software is
based on the finite-volume approach to approximation of the partial differ
ential equations describing fluid motion and accompanying physical process
es. It provides explicit and implicit methods for time integration of thes
e equations. FlowVision has own split-based method for solving Navier-Stok
es equations allowing to solve incompressible as well as supersonic gas fl
ows existing simultaneously in one computational domain. The software incl
udes automated generator of unstructured grid with capability of its local
dynamic adaptation and resolving boundary layers. The solver involves two
-level parallelism which allows calculations on computers with distributed
and shared memory (coexisting in the same hardware). FlowVision incorpora
tes a wide spectrum of physical models: different turbulence models\, mode
ls for mass transfer accounting for chemical reactions and radioactive dec
ay\, several combustion models\, a dispersed phase model\, an electro-hydr
odynamic model\, an original VOF model for tracking moving interfaces. It
should be noted that turbulence can be simulated within URANS\, LES\, and
ILES approaches. FlowVision simulates fluid motion with velocities corresp
onding to all possible flow regimes: from incompressible to hypersonic. Th
is is achieved by using an original all-speed velocity-pressure split algo
rithm for integration of the Navier-Stokes equations.\nFlowVision enables
solving multi-physic problems with use of different modeling tools. For in
stance\, one can simulate multi-phase flows with use of the VOF method\, f
lows past bodies moving across a stationary grid (within Euler approach)\,
flows in rotary machines with use of the technology of sliding grid. Besi
des that\, the software solves fluid-structure interaction problems using
the technology of two-way coupling of FlowVision with finite-element codes
. Some industrial examples of solving challenging problems in the FlowVisi
on software are demonstrated in this paper. The first one is splashdown of
a spacecraft after deceleration by means of jet engines. The second probl
em is simulation of the work of a human heart with artificial and natural
valves designed on the basis of tomographic investigations with use of a f
inite-element model of the heart.\n\nhttps://indico.jinr.ru/event/137/cont
ributions/549/
LOCATION: LIT Conference Hall
URL:https://indico.jinr.ru/event/137/contributions/549/
END:VEVENT
BEGIN:VEVENT
SUMMARY:TESTS OF DIFFERENT MPI IMPLEMENTATIONS IN HPC/KVM CLUSTER
DTSTART;VALUE=DATE-TIME:20170704T103000Z
DTEND;VALUE=DATE-TIME:20170704T104500Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-550@indico.jinr.ru
DESCRIPTION:Speakers: E. Alexandrov (LIT JINR)\nThe work explored the poss
ibility of combining Cloud and High-performance computing (HPC) cluster in
to a single system. Message Passing Interface (MPI) is the most popular pr
ogramming technology used for parallel calculations conducted on HPC clust
er. The solution of the problem of combining Cloud and HPC cluster is of i
nterest to investigate the efficiency of MPI technology when it is used on
virtual machines.\nIn this paper various MPI implementations (IntelMPI\,
OpenMPI) were tested on virtual machines based on Kernel Virtual Machine (
KVM) [1] hypervisor. The test polygon was placed on the Dell PowerEdge FX2
server which consists of 8 computing units with 2x CPU Intel Xeon E5-2680
v3\, 256 GB RAM. Each computing unit was connected to others by integrate
d 10 Gbit/s switch.\nDuring the tests all available combinations of connec
tions to local network and types of virtual network card supported by KVM
hypervisor were investigated. For each combination the test of network’s
bandwidth and processor load were measured.\nTesting was carried out for
two cases: 1) when virtual machines were placed on different physical comp
uting units\; 2) when virtual machines were placed on the same physical co
mputing unit.\nVarious MPI implementations were used following tests: Inte
l MPI Benchmarks [2]\, the program for calculating CVC in Long Josephson J
unctions [3]\, science package GIMM_FPEIVE [4] and so on. The results of t
he efficiency of MPI-tasks performed in HPC/KVM cluster are presented.\nTh
e work was financially supported by the RFBR grant No. 15-29-01217.\n\nRef
erences\n1. Humble Devassy Chirammal\, Prasad Mukhedkar\, Anil Vettathu
. Mastering KVM Virtualization // August 2016\n2. Intel® MPI Benchmark
s User Guide. – https://software.intel.com/en-us/imb-user-guide\n3. A
tanasova P.\, Bashashin M.V.\, Rahmonov I.R.\, Shukrinov Yu.M.\, Volohova
A.V.\, Zemlyanaya E.V. Numerical approach and parallel implementation for
computer simulation of stacked long Josephson Junctions // Computer Resear
ch and Modeling. Vol. 8\, No.4. 2016. Pp. 593-604.\n4. Alexandrov E.\,
Amirkhanov I. et al. Principles of Software Construction for Simulation of
Physical Processes on Hybrid Computing Systems (on the Example of GIMM FP
EIP Complex) // Bulletin of PFUR. Series: Mathematics. Information Science
s. Physics. No. 2. 2014. Pp. 197-205.\n\nhttps://indico.jinr.ru/event/137/
contributions/550/
LOCATION: 406B
URL:https://indico.jinr.ru/event/137/contributions/550/
END:VEVENT
BEGIN:VEVENT
SUMMARY:PHASE SPACE OF INSTANTANEOUS CARDIAC RHYTHM IS A FRACTAL
DTSTART;VALUE=DATE-TIME:20170707T101500Z
DTEND;VALUE=DATE-TIME:20170707T103000Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-551@indico.jinr.ru
DESCRIPTION:Speakers: A. Kudinov (Tver State University\, Tver\, Russia)\n
In this paper we present the instantaneous cardiac rhythm (ICR) function
and its difference derivative constructed based on the data of day-long
Holter monitoring. These functions contain complete patient cardiovascular
system state information. In order to analyze the behavior of these funct
ions\, there was introduced a concept of phase space (PS) of ICR the point
s of which had coordinates and in space R2 and moved along the phase t
rajectories. In order to visualize the ICR dynamics\, there was introduced
a concept of extended phase space (EPS) of ICR. The examples of PS and EF
S of ICR for specific patients of the Tver Cardiology Health Center are sh
own visually.\nWithin 24-48 hours we calculated the volumes of PS and EFS
filled with the phase trajectories of ICR with different sizes of cells co
vering the phase trajectories. The calculation results showed that a phase
volume of ICR had a power law dependence on cell size within the accuracy
of 1-2%. That established the fractality of PS of ICR.\nTaking into accou
nt the fractal properties of PS of ICR\, volume Г of PS of ICR is introdu
ced. Г is a volume filled with the phase trajectories of ICR in the D-dim
ensional space. As in statistical physic\, the log Г can be referred to a
s fractal entropy of ICR.\nWe undertook a study of and behavior dyna
mics for several patients the results of which are given in the tables.\nW
e argued in favor of use of parameters Г and S as cardiovascular system s
tate markers.\n\nhttps://indico.jinr.ru/event/137/contributions/551/
LOCATION: 406A
URL:https://indico.jinr.ru/event/137/contributions/551/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Quantum correlations in remote state creation. Information exchan
ge with vanishing entanglement.
DTSTART;VALUE=DATE-TIME:20170706T134500Z
DTEND;VALUE=DATE-TIME:20170706T140000Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-552@indico.jinr.ru
DESCRIPTION:Speakers: Alexander Zenchuk (Institute of Problems of Chemical
Physics of RAS)\nThe formation and evolution of quantum correlations is
one of the central problems of quantum information. Although quantum cor
relations are necessary to provide advantages of quantum information devic
es in comparison with their classical counterparts\, the appropriate me
asure of these correlations is not well-established yet. Quantum entanglem
ent [1] was considered as a suitable measure for a long time. However\, r
ecently the quantum discord was introduces [2\,3] as an alternative measur
e which can be valuable in systems with vanishing entanglement. \n\nWe ass
ume that quantum correlations can be classified (with possible overlaps
among different classes) so that a given quantum process is governed by a
certain class of quantum correlations rather than by all of them. In our
work we are aimed on revealing those quantum correlations that are respo
nsible for remote creation of a one-qubit state in a spin chain [4]\, wh
ich is the further development of the problem of end-to-end quantum sta
te transfer along a spin chain [5]. \n\nWe study the dependence of quant
um correlations between the two remote qubits (sender and receiver) connec
ted by a transmission line (homogeneous spin-1/2 chain) on the parameters
of the sender's and receiver's initial states (control parameters) [6].
We consider two different measures of quantum correlations: the entangleme
nt [1] (a traditional measure) and the informational correlation [7] (base
d on the parameter exchange between the sender and receiver). We find t
he domain in the control parameter space yielding (i) zero entanglement be
tween the sender and receiver during the whole evolution period and (ii) n
on-vanishing informational correlation between the sender and receiver\,
thus showing that the informational correlation is responsible for the rem
ote state creation. We demonstrate that\, among the control parameters\, t
here are the strong parameters (which strongly effect the values of studi
ed measures) and the weak ones (whose effect is negligible)\, therewith t
he eigenvalues of the initial state are given a privileged role. We also
show that the problem of small entanglement (concurrence) in quantum info
rmation processing is similar (in certain sense) to the problem of small
determinants in linear algebra. The particular model of the 40-node spi
n-1/2 communication line is presented.\n\nThis work is partially supported
by the Program of the Presidium of RAS “Element base of quantum compute
rs”(No. 0089-2015-0220) and by the Russian Foundation for Basic Research
\, Grant No. 15-07-07928.\n\n[1] S.Hill and W.K.Wootters\, Phys. Rev. Lett
. v.78\, 5022 (1997)\n[2] L.Henderson and V.Vedral J.Phys.A:Math.Gen. v.34
\, 6899 (2001)\n[3] H.Ollivier\, W.H.Zurek\, Phys. Rev. Lett. v.88\, 01790
1 (2001)\n[4] M.Zukowski\, A.Zeilinger\, M.A.Horne\, A.K.Ekert\, Phys. Rev
. Lett. v.71\, 4287 (1993)\n[5] S. Bose\, Phys. Rev. Lett. v.91\, 207901 (
2003)\n[6] S. I. Doronin\, A. I. Zenchuk\, Quant. Inf. Proc. (2017) DOI 1
0.1007/s11128-016-1514-6\n[7] A.I.Zenchuk\, Quant. Inf. Proc. v.13\, 2667
(2014)\n\nhttps://indico.jinr.ru/event/137/contributions/552/
LOCATION: LIT Conference Hall
URL:https://indico.jinr.ru/event/137/contributions/552/
END:VEVENT
BEGIN:VEVENT
SUMMARY:SOLUTION OF MAGNETOGASDYNAMICS PROBLEMS WITH THE HELP OF HIGH PERF
ORMANCE COMPUTER SYSTEMS
DTSTART;VALUE=DATE-TIME:20170703T080000Z
DTEND;VALUE=DATE-TIME:20170703T083000Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-553@indico.jinr.ru
DESCRIPTION:Speakers: Boris Chetverushkin (Keldysh Institute of Applied Ma
thematics\, Moscow\, Russia)\nNew approach to an obtaining of the equation
s of magnetic gas dynamics is offered. This approach is based on complex-v
alued locally Maxwellian distribution function. By means of the approach t
he equations of ideal magnetic gas dynamics are received. The analog of qu
asidynamic system of the equations is also constructed\, describing magnet
ic and gasdynamic processes taking into account dissipation of an impulse
and energy. The elaborated kinetic models and numerical algorithms of thei
r analysis were tested on the example of well-known tasks. The offered alg
orithms easily adapt to architecture of modern high-performance computer s
ystems.\n\nhttps://indico.jinr.ru/event/137/contributions/553/
LOCATION:
URL:https://indico.jinr.ru/event/137/contributions/553/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Fitting by orthogonal polynomials of silver nanoparticles spectro
scopic data
DTSTART;VALUE=DATE-TIME:20170704T111500Z
DTEND;VALUE=DATE-TIME:20170704T113000Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-568@indico.jinr.ru
DESCRIPTION:Speakers: Nina Bogdanova (INRNE\, BAS\, Sofia)\nNina Bogdanova
1 and Mihaela Koleva2\n1 INRNE\, BAS\, Sofia\, Email:nibogd@inrne.bas.bg\
n2 IE\, BAS\, Sofia\, Email:mihaela_ek@yahoo.com\nOur original Orthonorma
l Polynomial Expansion Method (OPEM) [1] in one-dimensional version is app
lied for first time to describe the silver nanoparticles spectroscopic dat
a [2\,3]. The experimental errors in variables are included in weights for
approximation - different in every point. In this way we construct orthog
onal (orthonormal ) polynomials for presenting the curve. The corridors of
given data by the help of the weights define the optimal behavior of soug
ht for curve with the help of some criteria. \nWe have received four exper
imental curves in thousands points for analysis. We have chosen one subint
erval in one of them. The most important subinterval of spectra data is in
vestigated\, where the minimum (surface plasmon resonance absorption) is l
ooking for.\nThe received results from our numerical experiments are compa
red with other theoretical curves for the data. We hope that with our desc
ription we have pointed the experimental work to regular direction.\nRefer
ences.:\n1. Nina Boganova and Stefan Todorov\, "New approximating resul
ts for data with errors in both variables"\, in J. OF PHYSICS OF PARTICLE
S AND NUCLEUS LETTERS\, JINR\, DUBNA\, 2015\, vol.12 No.3\, pp.358-388.\n2
. Koleva M.E.\, Nedyalkov N.N.\, Fukata N.\, Jevasuwan W.\, Amoruso\, S
..“Laser nanostructuring for plasmon enhancement of Ag/ZnO optical chara
cteristics”\, 2017\, Proceedings of SPIE - The International Society for
Optical Engineering\, 10226\, 1022609. \n3. Koleva M.E.\, Nedyalkov
N.N.\, Atanasov P.A.\, Gerlach J.W.\, Hirsch D.\, Prager A.\, Rauschenbach
\, B.\, Fukata\, N.\, Jevasuwan\, W. “Porous plasmonic nanocomposites fo
r SERS substrates fabricated by two-step laser method”\,2016\, Journal o
f Alloys and Compounds\, 665\, pp. 282-287.\n\nhttps://indico.jinr.ru/even
t/137/contributions/568/
LOCATION:
URL:https://indico.jinr.ru/event/137/contributions/568/
END:VEVENT
BEGIN:VEVENT
SUMMARY:IMAGE CLASSIFICATION BY SHALLOW AND DEEP NEURAL NETWORKS
DTSTART;VALUE=DATE-TIME:20170706T103000Z
DTEND;VALUE=DATE-TIME:20170706T110000Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-554@indico.jinr.ru
DESCRIPTION:Speakers: Gennady Ososkov (Joint Institute for Nuclear Researc
h)\nThe paper intends to demonstrate the advantages of deep learning appro
aches over ordinary shallow neural network (NN) on their comparative appli
cations to image classifying. An autoassociative neural network is used as
a standalone program realized the nonlinear principal component analysis
(NLPCA) for prior extracting the most informative features of input data f
or neural networks to be compared further as classifiers. Two special stud
ies devoted to the optimal choice of activation function\, the normalizati
on transformation of input data and to denoising properties of our NLPCA a
lgorithm demonstrate its efficiency even on noisy data. Three types of neu
ral networks are compared: feed-forward NN with one hidden layer\, deep NN
with several hidden layers and deep belief NN with several pretraining RB
M layers. The number of hidden layer and the number of hidden neurons in t
hem were chosen by cross-validation procedure to keep balance between numb
er of layers and hidden neurons and classification efficiency. Results of
our comparative study demonstrate the undoubted advantage of deep networks
\, as well as denoising power of autoencoders. In our work we use both GPU
and cloud services to speed up our calculations.\n\nhttps://indico.jinr.r
u/event/137/contributions/554/
LOCATION: 406B
URL:https://indico.jinr.ru/event/137/contributions/554/
END:VEVENT
BEGIN:VEVENT
SUMMARY:A COMPUTATIONAL ALGORITHM FOR COVARIANT SERIES EXPANSIONS IN GENER
AL RELATIVITY
DTSTART;VALUE=DATE-TIME:20170704T103000Z
DTEND;VALUE=DATE-TIME:20170704T104500Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-555@indico.jinr.ru
DESCRIPTION:Speakers: Alexander Tsirulev (Tver State University)\nWe prese
nt a new algorithm for computing covariant power expansions of tensor fiel
ds in generalized Riemannian normal coordinates introduced in some neighbo
rhood of a parallelized k-dimensional embedded submanifold the case cor
responds to a point. The algorithm is applicable for nonmetric connections
\, possibly with the torsion. The power series coefficients of an arbitrar
y real analytic tensor field are expressed in terms of its covariant deriv
atives and covariant derivatives of the curvature and the torsion. We disc
uss different ways to reduce normal polynomial expansions to the irreducib
le form\, enumerate the number of summands in the coefficients\, and evalu
ate the computational complexity of the algorithm.\n\nhttps://indico.jinr.
ru/event/137/contributions/555/
LOCATION: 406A
URL:https://indico.jinr.ru/event/137/contributions/555/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Variational solution of the Schrödinger equation in an inhomogene
ous central field as applied to emission problems.
DTSTART;VALUE=DATE-TIME:20170704T130000Z
DTEND;VALUE=DATE-TIME:20170704T131500Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-557@indico.jinr.ru
DESCRIPTION:Speakers: Ilya Tolstov (Keldysh Institute of Applied Mathemati
cs)\nThe present work is devoted to the supercomputer modelling of the emi
ssion processes from the surface of nanostructures that are perspective fo
r modern applications. Within the subject emission processes from single-w
all nanotubes with diameters of nanometre range are of particular interest
. These devices can be successfully used in nanolithography and non-destru
ctive sounding of nanomaterials. However\, for their practical realization
the emission processes are needed a detailed study\, considering quantum
effects. One of essential elements of such analysis is studying the proper
ties of the nanotube surface at the atomic level. In the present paper\, w
e use the fact that the fragment of the nanotube surface is a layer of gra
phene. A hydrogen-like atom model is used for a detailed consideration of
the properties of this object. Earlier\, we solved this problem without ta
king into account the inhomogeneity of the ion field. This research was ma
de with considering the influence of the inhomogeneity of the ion field on
the solution of the ground state of a weakly bound electron of a hydrogen
-like carbon atom in a graphene lattice. It is shown that the use of the v
irial theorem in an inhomogeneous field essentially affects the variationa
l solution of the Schrödinger equation.\n\nhttps://indico.jinr.ru/event/1
37/contributions/557/
LOCATION: 406A
URL:https://indico.jinr.ru/event/137/contributions/557/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Features of plastic flow localization in hollow cylinder
DTSTART;VALUE=DATE-TIME:20170706T113000Z
DTEND;VALUE=DATE-TIME:20170706T114500Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-558@indico.jinr.ru
DESCRIPTION:Speakers: Pavel Ryabov (National Research Nuclear University M
EPhI)\, Rodion Muratov (National Research Nuclear University MEPhI)\nThe p
rocess of plastic flow localization in hollow cylinder which is made from
high-strength steel undergoing the torsion deformation is considered. The
mathematical model of the process of plastic flow localization is formulat
ed taking into account the cylindrical symmetry of the problem. The transi
tion of the proposed model to a mathematical model describing the processe
s of plastic flow localization in the plane case is discussed. Numerical a
lgorithm which allows one to simulate the fully localized plastic flow in
cylindrical case is proposed. The influence of the geometry of the problem
on the processes of plastic flow localization is considered. In particula
r\, the effect of the value of the internal radius of the cylinder on the
processes of localization of plastic deformation is studied. It was found
that a decrease in the radius of the inner cylinder leads to a substantial
change in the solution and to the displacement of the region of localizat
ion of the deformation to the inner surface of the hollow cylinder. The ef
fect of nonuniform heating of the sample on the localization of plastic de
formation is also investigated. The obtained results are compared with the
limiting case\, namely\, the process of localization of plastic deformati
on under shear deformations of the plate.\n\nhttps://indico.jinr.ru/event/
137/contributions/558/
LOCATION: 310
URL:https://indico.jinr.ru/event/137/contributions/558/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Automation of stochastization algorithm with use of SymPy computer
algebra library
DTSTART;VALUE=DATE-TIME:20170707T113000Z
DTEND;VALUE=DATE-TIME:20170707T114500Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-559@indico.jinr.ru
DESCRIPTION:Speakers: Anastasya Demidova (Peoples’ Friendship University
of Russia (RUDN University))\, Migran Gevorkyan (PFU)\nTo describe models
where the intensity of the interaction between components depends on the
concentration of a component\, one can use the scheme of interaction from
chemical kinetics:\n\\[\n\\sum\\limits^{n}_{i=1}N^{s}_{i}X_{i} \\xleftrigh
tarrow[\\\;\\\;k^{-}_{s}\\\;\\\;]{\\\;\\\;k^{+}_{s}\\\;\\\;} \\sum\\limits
^{n}_{i=1}M^{s}_{i}X_{i}\,\\\; s = 1\,\\ldots\,S.\n\\]\nHere $X_{i}$ repre
sents the number $i$-th component\, matrices $\\mathbf{M} = [M^{s}_{i}]$ a
nd $\\mathbf{N} = [N^{s}_{i}]$ are called the system state matrices and sp
ecify the number of interacting components of the system at each stage of
the reaction $k^{+}_{s}$ and $k^{-}_{s}$ --- are coefficients of interacti
on in direct and reverse reactions.\nOne can use such schemes to describe
models of chemical reactions\, biological and ecological systems. From the
se diagrams we can derive a system of ordinary differential equations desc
ribing the change of variables $X_{i}(t)$ over time.\n\nOur research group
has been generalized the stochastization method\, which allows write out
stochastic differential equation based on deterministic model . The origin
al data reported in the interaction scheme\, it is enough to get stochasti
c differential equations. For systems of large dimension\, the stochastiza
tion method requires a large amount of routine work. However\, it is possi
ble to automate it. This paper describes this automation\, by using Python
language and SymPy library for symbolic camputations.\n\nCreated program
allows from the array of the coefficients of the interactions to obtain at
the output the system of ODE and vector drift and the diffusion matrix fo
r the system of SDEs in human-readable form and in other formats suitable
for direct numerical solution.\n\nThe work is partially supported by RFBR
grants No's 15-07-08795 and 16-07-00556. Also the publication was financia
lly supported by the Ministry of Education and Science of the Russian Fede
ration (the Agreement No 02.A03.21.0008).\n\nhttps://indico.jinr.ru/event/
137/contributions/559/
LOCATION:
URL:https://indico.jinr.ru/event/137/contributions/559/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Optimisation of air pollution dispersion and deposition models
DTSTART;VALUE=DATE-TIME:20170704T124500Z
DTEND;VALUE=DATE-TIME:20170704T130000Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-561@indico.jinr.ru
DESCRIPTION:Speakers: Vladislav Svozilík (JINR)\nGaussian plume models ar
e commonly used class of mathematical models used in the air pollution dis
persion and/or deposition modelling. The goal of the study was to optimize
computations with the Gaussian model Symos'97 to significantly improve th
e speed of computations and to migrate computations from proprietary softw
ares (ArcGIS\, SW implementation of the model for PC) to unified\, platfor
m-independent and open source platform via the Python programming language
. The result is the Python script module which has been able to speed up w
hole modeling process by several order of magnitude thanks to more optimal
code and parallel processing and make it more user friendly for modelers.
\nThe modelling toolset is going to be used in studies evaluating air qual
ity and studying effectivity of potential air quality remedies within vast
regions in a detail scale.\n\nhttps://indico.jinr.ru/event/137/contributi
ons/561/
LOCATION: 310
URL:https://indico.jinr.ru/event/137/contributions/561/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Numerical methods for the prediction and optimization of the cryos
urgery operations
DTSTART;VALUE=DATE-TIME:20170706T111500Z
DTEND;VALUE=DATE-TIME:20170706T113000Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-562@indico.jinr.ru
DESCRIPTION:Speakers: Kirill Shilnikov (National Research Nuclear Universi
ty MEPhI)\nIn this talk we consider the problem of planning and optimizati
on of the cutaneous cryosurgery operations. The method of the additional h
eating and freezing elements mounting is studied as an approach to optimiz
e the cellular necrosis front propagation. Mathematical modeling is used f
or the effectiveness improvement of the method under consideration. An exp
licit scheme based on the finite volume approximation of phase averaged Pe
nnes bioheat transfer model is applied . The flux relaxation method is use
d for the stability improvement of scheme.\n\nhttps://indico.jinr.ru/event
/137/contributions/562/
LOCATION: 310
URL:https://indico.jinr.ru/event/137/contributions/562/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Comparing the effectiveness of PROOF with others methods of parall
elizm for the experimental data processing.
DTSTART;VALUE=DATE-TIME:20170707T130000Z
DTEND;VALUE=DATE-TIME:20170707T131500Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-563@indico.jinr.ru
DESCRIPTION:Speakers: Tatiana Solovjeva (JINR)\nThe modern scientific rese
arch requires careful modeling of experiments\, as well as the fast and qu
alitative processing of a large amount of data. Under that the comparison
of the used models and the optimization of the program code are performed.
Optimization implyes both algorithmic code improvement and the usage of h
igh-performance and parallel technologies.\nIn high-energy physics\, the s
tandard of data analysis and visualization has become ROOT - the object-or
iented framework been developed at CERN. ROOT based software is used in mo
st of modern experiments. ROOT provides several options for parallelism. F
irst\, it contains PROOF[1] - Parallel ROOT Facility - ROOT extension\, wh
ich performs interactive analysis on large sets of ROOT files in parallel
on multiprocessor machines. Secondly\, it allows the use of technologies O
penMP and MPI.\nIn current paper we compare the effectiveness of all ROOT
methods for parallelizing computations\, depending on the type of experime
ntal data analysis\, on their volume and on the computing platform.\nThe P
ROOF cluster is built according to the standard master-workers scheme. Due
to the multi-level architecture\, which allows creating a hierarchy of ma
ster and submaster nodes\, this approach can be easily adapted to a wide r
ange of virtual clusters. The user\, working in the ROOT session\, can sta
rt the processes communicating with the PROOF-cluster and submit requests
for job processing. Upon receiving request for job processing\, a special
ROOT application - proofserv - starts on the wizard and on the working nod
es for each user session. The process executed on the master coordinates t
he work between the work nodes and combines the results. At work nodes\, t
he proofserv process does performed the computational work itself\, proces
sing individual jobs.\nParallel calculations can also be implemented with
the TThread class. A single process can have multiple threads. The actual
work is done in the class TThreadImp (or TPosixThread or Twin32Thread).\n\
nReference\n1. Brun\, R. et al. Parallel interactive data analysis with
PROOF // Nuclear Instruments and Methods in Physics Research. – 2006.
– A559. – P. 13–16.\n\nhttps://indico.jinr.ru/event/137/contribution
s/563/
LOCATION: LIT Conference Hall
URL:https://indico.jinr.ru/event/137/contributions/563/
END:VEVENT
BEGIN:VEVENT
SUMMARY:RO-14-ITIM\, upgrades for a diskless site
DTSTART;VALUE=DATE-TIME:20170704T130000Z
DTEND;VALUE=DATE-TIME:20170704T131500Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-564@indico.jinr.ru
DESCRIPTION:Speakers: Jefte Nagy (National Institute for Research and Deve
lopment of Isotopic and Molecular Technologies\, 65-103 Donath\, 400293 Cl
uj-Napoca\, Romania)\nGrid site are a challenging job\, but in they can mo
dify for the greater good. They can become from full Grid sites just to si
mple processing units or simple storage systems. Everything depends on fin
ancial support or financial and human support. At the National Institute f
or Research and Development of Isotopic and Molecular Technologies (INCDTI
M) Cluj-Napoca\, there is such a Grid site which in the last time because
of lack of financial support and low storage capacity has to change his st
atus from a full site to a diskless site for the ATLAS processing experime
nt. This paper will present the last year thinking and solution for upgrad
ing the site to a strong processing system for single and multi-core jobs
from around the world.\n\nhttps://indico.jinr.ru/event/137/contributions/5
64/
LOCATION: 406B
URL:https://indico.jinr.ru/event/137/contributions/564/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Monte Carlo simulation of early biological damage induced by ioniz
ing radiation at the DNA scale: overview of the Geant4-DNA project
DTSTART;VALUE=DATE-TIME:20170704T083000Z
DTEND;VALUE=DATE-TIME:20170704T090000Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-565@indico.jinr.ru
DESCRIPTION:Speakers: SEBASTIEN INCERTI (CNRS/IN2P3)\nINTRODUCTION \n\nMod
eling accurately biological damage induced by ionizing radiation at the sc
ale of the DNA molecule remains a major challenge of today’s radiobiolog
y research (1). In order to provide the community with an easily accessibl
e mechanistic simulation platform\, the general purpose and open source
“Geant4” Monte Carlo simulation toolkit (2) is being extended in the f
ramework of the “Geant4-DNA” project (3) with a set of functionalities
allowing the detailed simulation of particle-matter interactions in biolo
gical medium. These functionalities include physical\, physico-chemical an
d chemical processes that can be combined with nanometer size geometries o
f biological targets in order to predict early DNA damage. We will present
an overview of the Geant4-DNA project and discuss on-going developments.
\n\nTHE GEANT4-DNA EXTENSION OF GEANT4\n\n The main developments undertak
en by the Geant4-DNA collaboration (3-5) cover three main areas:\n• P
hysics processes: several sets of physics processes are available in order
to describe the dominant discrete physical interactions of electrons\, pr
otons\, hydrogen atoms\, alpha particles and their charged states in liqui
d water\, the main component of biological medium. These can be combined w
ith existing Geant4 processes for the description of other processes\, suc
h as photon interactions.\n• Physico-chemistry and chemistry processe
s: such processes can simulate water radiolysis from physical interactions
\, that is the creation\, the diffusion and mutual reactions of molecular
species in liquid water\, up to 1 microsecond after irradiation. \n•
Detailed geometries of biological targets: benefiting from Geant4 geometry
modeling capabilities\, it is now possible to simulate accurate geometrie
s of biological targets\, such as the DNA molecule.\n\nThese developments
can be combined in order to predict early DNA damage. In particular\, on-g
oing developments will lead to the prediction of indirect damage in bacter
ia and cells and pave the way to the inclusion of repair mechanisms\, exte
nding simulation capabilities well beyond the microsecond.\n\nOUTCOME \n\n
All features described above are fully accessible (6) through the Geant4 s
imulation toolkit and can be run using a freely downloadable Linux (TM) Ce
ntOS (TM) virtual machine (7). We hope that this platform and its future d
evelopments will be useful for the further mechanistic understanding of io
nizing radiation effects in biological targets\, especially when high spat
ial resolution (nanometer) and low energy (few electonsVolts) simulations
are required.\n\nREFERENCES \n\n1. “Monte Carlo role in radiobiological
modelling of radiotherapy outcomes\,” Phys. Med. Biol.\, 57\, pp. R75-R9
7 (2012).\n2. http://geant4.org \n3. “Track structure modeling in liquid
water: A review of the Geant4-DNA very low energy extension of the Geant4
Monte Carlo simulation toolkit\,” Phys. Medica\, 31\, pp. 861-874 (2015
).\n4. “Comparison of Geant4 very low energy cross section models with e
xperimental data in water\,” Med. Phys.\, 37\, pp. 4692-4708 (2010).\n5.
“The Geant4-DNA project\,” Int. J. Model. Simul. Sci. Comput.\, 1\, p
p. 157-178 (2010).\n6. http://geant4-dna.org \n7. http://geant4.in2p3.fr\n
\nhttps://indico.jinr.ru/event/137/contributions/565/
LOCATION:
URL:https://indico.jinr.ru/event/137/contributions/565/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Primary data treatment software for position-sensitive detector of
small-angle neutron scattering spectrometer in isotropic pattern scatteri
ng case
DTSTART;VALUE=DATE-TIME:20170707T131500Z
DTEND;VALUE=DATE-TIME:20170707T133000Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-566@indico.jinr.ru
DESCRIPTION:Speakers: Alexei Soloviev (JINR)\nThe modern trends in use of
the small-angle scattering method consist in varying a sample environment\
, e.g. temperature\, pressure\, magnetic or electric fields. The objects u
nder investigation can be oriented in the field or by the flow of a liquid
. In this case the need for the position-sensitive detector (PSD) arises.
\n\nThe position-sensitive detector of the new type has been created for t
he YuMO spectrometer. Currently\, this spectrometer has a two-detector sys
tem with coaxial ring detectors with a central hole [1] and does not have
azimutal angle sensitivity. And the SAS package [2-4] is used for its data
treatment. PSD is planed to be mount either in the place of one of YuMO d
etectors\, or in addition to them (turning it into three-detector system).
And the problem of PSD data processing is actual. \n\nDue to small size o
f PSD cells statistics in them is often poor. That fact negatively impact
s on data treatment. On the other hand\, in most of the experiments one ne
eds isotropic pattern of scattering only\, when objects in a sample are n
ot oriented. Thus in most cases is possible to combine PSD cells into conc
entric rings what first improves statistics and finally makes applicable t
he algorithms already used for data processing in SAS. \n\nTo implement th
is task of data reduction ROOT framework [5] was choosen. The final script
[6] allows one to choose the number of rings\, to correct their common ce
nter if needed\, to visualize and to control all the data at every stage o
f the conversion. The crossection area of a cell and the resulting ring is
taken into account. And the next step will be implementing it as the SAS
module for reading PSD data directly.\n\nhttps://indico.jinr.ru/event/137/
contributions/566/
LOCATION: LIT Conference Hall
URL:https://indico.jinr.ru/event/137/contributions/566/
END:VEVENT
BEGIN:VEVENT
SUMMARY:MOLECULAR DYNAMIC SIMULATION OF WATER VAPOR INTERACTION WITH BLIND
PORE OF DEAD-END AND SACCATE TYPE
DTSTART;VALUE=DATE-TIME:20170703T114500Z
DTEND;VALUE=DATE-TIME:20170703T120000Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-567@indico.jinr.ru
DESCRIPTION:Speakers: Mária Popovičová (University of Presov\, Presov\,
Slovakia)\nOne of the varieties of pores\, often found in natural or arti
ficial building materials\, are the so-called blind pores of dead-end or s
accate type. Three-dimensional model of such kind of pore has been develop
ed in this work. This model has been used for simulation of water vapor in
teraction with individual pore by molecular dynamic method [1]. Special in
vestigations have been done to find dependencies between thermostats imple
mentations and conservation of thermodynamic and statistical values of wat
er vapor - pore system. The all types of evolutions of water – pore syst
em have been investigated: drying and wetting of the pore. Full research o
f diffusion coefficient\, diffusion velocity and other diffusion parameter
s has been made. Simulation results analysis demonstrates an importance
of the investigation of the water vapor interaction with individual pore
from point of view the control of water penetration into building material
and protection of building material from wetting.\n\nReferences \n[1]
Gould H.\, Tobochnik J.\, Christian W.\, An Introduction to Computer Simul
ation Methods\, Third edition\, 2005. \n\n This work is supported by JINR
LIT topic No. 05-6-1118-2014/2019\, protocol No. 4596-6-17/19\n\nhttps://
indico.jinr.ru/event/137/contributions/567/
LOCATION: 406A
URL:https://indico.jinr.ru/event/137/contributions/567/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Symbolic and numerical modeling of nonlinear dynamics of particles
in accelerators
DTSTART;VALUE=DATE-TIME:20170706T134500Z
DTEND;VALUE=DATE-TIME:20170706T140000Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-569@indico.jinr.ru
DESCRIPTION:Speakers: Ekaterina Sboeva (Saint-Petersburg State University\
, Faculty of Applied Mathematics and Control Processes)\nThe actual task o
f accelerator physics is the preliminary modeling of particle beam dynamic
s in an accelerator (including polarized ones). The search for optimal par
ameters of the control system that provides the necessary functionality of
the particle beam particle control system is a resource-intensive problem
\, which leads to the need to use appropriate mathematical models which na
turally allow parallelization and distribution of the corresponding comput
ational procedures. At present\, the main tool are software packages based
on a numerical of trajectory description of the particle beam\, which sig
nificantly reduces the efficiency of finding optimal parameters for contro
l elements. In this paper\, we consider a method that allowing us to form
a map generating by the control system in terms of special matrices and en
sure the performance of the necessary properties (for example\, symplectic
ity).\nThe similar approach makes it possible to effectively use the metho
ds of symbolic computation\, which makes it possible not only to significa
ntly reduce the time spent and simplify the analysis procedure\, and also
to provide the possibility of varying the parameters that ensure the neces
sary properties of the beam.\nIn this paper\, we present a mathematical me
thod that allows us to construct the necessary solutions\, taking into acc
ount the symplecticity of the system with a given accuracy. Examples of th
e solution of such problems are given.\n\nhttps://indico.jinr.ru/event/137
/contributions/569/
LOCATION:
URL:https://indico.jinr.ru/event/137/contributions/569/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Linear approximation of volume integral equations for solving magn
etostatics problems
DTSTART;VALUE=DATE-TIME:20170706T123000Z
DTEND;VALUE=DATE-TIME:20170706T124500Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-570@indico.jinr.ru
DESCRIPTION:Speakers: Pavel Akishin (JINR\, LIT)\nVolume integral equation
s method is considered for calculation of magnetic systems. We discuss an
approach\, based on finite element linear approximation of unknown vector
field variables. Initially a three-dimensional domain is represented as a
combination of standard macro-blocks with two-dimensional mesh on the boun
daries. This allows to generate three-dimensional mesh in each individual
block. Cubature formula methods are used for matrix coefficient calculatio
ns. We introduce a special procedure for evaluating matrix elements in a s
ingular case. The results of various magnet systems simulations based on t
his approach are shown.\n\nhttps://indico.jinr.ru/event/137/contributions/
570/
LOCATION:
URL:https://indico.jinr.ru/event/137/contributions/570/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Computing Gröbner and Involutive Bases for Linear Systems of Diff
erence Equations
DTSTART;VALUE=DATE-TIME:20170707T104500Z
DTEND;VALUE=DATE-TIME:20170707T110000Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-571@indico.jinr.ru
DESCRIPTION:Speakers: Denis Yanovich (LIT JINR)\nIn this paper the author
will talk about the problem of computing involutive bases and Gröbner bas
es of linear systems of difference equations\, its importance\, applicabil
ity for physical and mathematical problems and the algorithm for solving i
t.\nAn implementation of the computation algorithm in C will be presented\
, calculation times will be compared with the competing programs. The para
llel version of this implementation and its scalability will be considered
.\n\nhttps://indico.jinr.ru/event/137/contributions/571/
LOCATION: 310
URL:https://indico.jinr.ru/event/137/contributions/571/
END:VEVENT
BEGIN:VEVENT
SUMMARY:SaaS platform for time series data handling
DTSTART;VALUE=DATE-TIME:20170704T124500Z
DTEND;VALUE=DATE-TIME:20170704T130000Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-572@indico.jinr.ru
DESCRIPTION:Speakers: Ekaterina Oplachko (Keldysh Institute of Applied Mat
hematics)\nThere is a cloud based resource MathBrain which provides users
with tools for time series analysis. The most of methods is dedicated to m
agnetic- and electro encephalography (MEG\, EEG) analysis which originally
contains big amount of data to calculate. These methods of brain analysis
are noninvasive\, and the process looks like a registration of electro-ma
gnetic activity. During the procedure\, magnetic encephalograph device reg
isters a magnetic field for several minutes\, in hundreds of channels. Thu
s\, as a result of these experiments specialists have big amount of data w
ith complex structure. The resource suggests spectral methods\, quantitati
ve analysis\, principal component analysis\, independent component analysi
s and inverse problem solution [1]. From mathematical prospective the anal
ysis is based mostly on Fourier transform method [2]. From technical side\
, Software as a Service platform gives such advantages as operating system
independency\, hardware capacity and opens a way for revising solutions i
n data-handling problems field [3\, 4]. These pros are available\, because
the tool is provided as a “thin” client and user doesn’t have to in
stall any application on local computer. The architecture of this resource
contains several layers of abstraction which help to share hardware betwe
en tasks and can be used for balancing the load. The engine of the resour
ce which handle data is written on Python language. The task queue works o
n JSON-RPC listener/task-dispatcher scripts. Such approach allows not to o
verload the hardware during the complex calculations. \nReferences \n1.
Rykunov S.D.\, Oplachko E.S.\, Ustinin M.N.\, Llinás R.R. Methods for mag
netic encephalography data analysis in MathBrain cloud service. Mathematic
al Biology and Bioinformatics. 2017. V.12. № 1. P. 176–185. doi: 10.17
537/2017.12.176\n2. Jansen B.J.\, Bourne J.R.\, Ward J.W. Spectral decompo
sition of EEG intervals using\nWalsh and Fourier transforms. IEEE Trans. B
iomed. Eng. 1981. V. 28. P. 836–838. \n3. Alex Mu-Hsing Kuo. Opportunit
ies and Challenges of Cloud Computing to Improve Health Care Services. J M
ed Internet Res. 2011\;13(3):e67.\n4. Oplachko E.S.\, Ustinin D.M.\, Ustin
in M.N. Cloud Computing Technologies and their Application in Problems of
Computational Biology. Mathematical Biology and Bioinformatics. 2013\;8(2)
:449-466 (in Russ.). doi: 10.17537/2013.8.449\n\nThis work was partially s
upported by the Russian Foundation for Basic Research (grants 16-0700937\,
16-07-01000\, 17-07-00677\, 17-07-00686)\, by the Program I.33P for Funda
mental Research of the Russian Academy of Sciences\, and by the CRDF Globa
l (USA) (grants CRDF RB1-2027 and RUB-7095-MO-13).\n\nhttps://indico.jinr.
ru/event/137/contributions/572/
LOCATION: LIT Conference Hall
URL:https://indico.jinr.ru/event/137/contributions/572/
END:VEVENT
BEGIN:VEVENT
SUMMARY:ELASTIC FORM FACTORS FROM SEPARABLE KERNEL
DTSTART;VALUE=DATE-TIME:20170703T133000Z
DTEND;VALUE=DATE-TIME:20170703T134500Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-573@indico.jinr.ru
DESCRIPTION:Speakers: Artem Bekzhanov (JINR\, BLTP)\, Serge Bondarenko (JI
NR)\nThe method of construction of bound systems (deuteron\, pion) based o
n the separable kernels of interaction is discussed. Also the work describ
es а way of studying the EM characteristics of such the systems\, includi
ng elastic form factors. The questions of gauge-invarience are discussed.
Comparison with the experimental data is carried out.\n\nhttps://indico.ji
nr.ru/event/137/contributions/573/
LOCATION: 310
URL:https://indico.jinr.ru/event/137/contributions/573/
END:VEVENT
BEGIN:VEVENT
SUMMARY:NUCLOTRON BEAM MOMENTUM RECONSTRUCTION USING MULTIWIRE PROPORTIONA
L CHAMBERS AND DRIFT CHAMBERS IN THE BM@N EXPERIMENT
DTSTART;VALUE=DATE-TIME:20170707T113000Z
DTEND;VALUE=DATE-TIME:20170707T114500Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-574@indico.jinr.ru
DESCRIPTION:Speakers: Nikolay Voytishin (LIT\, Joint Institute for Nuclear
Research\, Dubna\, Russia)\nVoytishin N.\nvoitishinn@gmail.com\nLIT\, Joi
nt Institute for Nuclear Research\, Dubna\, Russia\n\nRelativistic heavy i
on collisions provide the unique opportunity to study nuclear matter under
extreme density and temperature. If the energy density in the formed fire
ball is sufficiently large the quark-gluon substructure of nucleons become
s visible. Theoretical models\, however\, suggest different possible scena
rios to describe these features of strongly interacting matter. New experi
mental data with high resolution and statistics are needed in order to dis
entangle different theoretical predictions [1\,2]. The BM@N is a fix-targe
t experiment that is meant to fulfil this need. \nThe BM@N project is cons
idered as a 1st phase of NICA Mega science project. The energy of the beam
will vary from 1 to 6 GeV/u. The beams delivered by Nuclotron will be of
different types from simple protons to heavy Au. The ability to reconstruc
t the beam momentum with high precision is one of the methods for showing
that the tracking detectors are tuned in the right way and the reconstruct
ion procedure performs well.\nThe quick overview of the experimental setup
is given in the work along with the description of the main tracking dete
ctors. The performance parameters of the detectors and reconstruction algo
rithms are brought up. The beam momentum reconstruction procedure is descr
ibed and the results of this procedure are presented for different values
of beam energy.\n\nReferences\n1. Adams J. et al. // Nucl. Phys. A. Vol
. 757. 2005. Pp. 102-183.\n2. Adcox K. et al. // Nucl. Phys. A. Vol. 75
7. 2005. Pp. 184-283.\n\nhttps://indico.jinr.ru/event/137/contributions/57
4/
LOCATION: LIT Conference Hall
URL:https://indico.jinr.ru/event/137/contributions/574/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Model of phase transition mimicking cold quark-hadron mixed phase
DTSTART;VALUE=DATE-TIME:20170703T140000Z
DTEND;VALUE=DATE-TIME:20170703T143000Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-575@indico.jinr.ru
DESCRIPTION:Speakers: Alexander Ayriyan (Laboratory of Information Technol
ogies\, JINR)\nPossible hadron-quark phase transition in the interior of t
he compact stars is one of actual question nuclear physics. Usually modeli
ng of this transition are made with use of so called Maxwell construction\
, where the two phases assumed to be separated. However due to surface ten
sion effects the mixer of phases could be thermodynamically more sufficien
t. We have suggested a simple model of such a mixed phase equation of stat
e parametrized by impact of structure of phase mixing in pressure ΔP.\n\n
https://indico.jinr.ru/event/137/contributions/575/
LOCATION:
URL:https://indico.jinr.ru/event/137/contributions/575/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Study of the GEM detector performance in BM@N experiment
DTSTART;VALUE=DATE-TIME:20170707T114500Z
DTEND;VALUE=DATE-TIME:20170707T120000Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-576@indico.jinr.ru
DESCRIPTION:Speakers: Vasilisa Lenivenko (LHEP)\nGas Electron Multiplier (
GEM) detector is developed for modern purposes in elementary particle phys
ics.\nIn the actual BM@N experiment a GEM system is used for trajectories
reconstruction of charged particles.\nThe investigation of GEM performanc
e (efficiency and spacial resolution) is presented.\n\nhttps://indico.jin
r.ru/event/137/contributions/576/
LOCATION: LIT Conference Hall
URL:https://indico.jinr.ru/event/137/contributions/576/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Effective Methods for Solving Band SLE after Parabolic Nonlinear P
DEs.
DTSTART;VALUE=DATE-TIME:20170703T140000Z
DTEND;VALUE=DATE-TIME:20170703T143000Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-577@indico.jinr.ru
DESCRIPTION:Speakers: Milena Veneva (JINR)\nA class of models of heat tran
sfer processes in a multilayer domain was considered. The governing equati
on (GE) is a nonlinear heat-transfer equation with different temperature-d
ependent densities and thermal coefficients in each layer. Homogeneous Neu
mann boundary conditions and ideal contact ones were applied. The aim of t
his research was to build a finite difference scheme on an uneven mesh wit
h a second-order approximation in some norm in the case of a piecewise con
stant spatial step. This discretization leads to a pentadiagonal (PD) syst
em of linear equations with a matrix which is neither diagonally dominant\
, nor positive definite. A tridiagonal (TD) system was obtained\, using Ga
ussian elimination. Two different methods for solving the two linear syste
ms were developed – diagonal dominantization and symbolic algorithms.\n\
nhttps://indico.jinr.ru/event/137/contributions/577/
LOCATION:
URL:https://indico.jinr.ru/event/137/contributions/577/
END:VEVENT
BEGIN:VEVENT
SUMMARY:On the generalized Sundman transformations and integrable Li\\'{e}
nard--type equations
DTSTART;VALUE=DATE-TIME:20170706T113000Z
DTEND;VALUE=DATE-TIME:20170706T114500Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-578@indico.jinr.ru
DESCRIPTION:Speakers: Dmitry Sinelshchikov (National Research Nuclear Univ
erstiy)\nIn this talk we discuss applications of the generalized Sundman t
ransformations for finding families of integrable Li\\'{e}nard--type equat
ions. Under integrable equations here we understand equations for which we
can construct the general analytical solution. Employing connections\, gi
ven by the generalized Sundman transformations\, between Li\\'{e}nard--typ
e equations and equations of the Painleve--Gambier type we demonstrate a p
ossibility of finding new integrable Li\\'{e}nard--type equations. We cons
ider connections between Li\\'{e}nard--type equations and type I--III Pain
leve--Gambier equation. As a result\, we obtain nine criteria for the inte
grability of the Li\\'{e}nard--type equations. We also consider applicatio
ns of this approach for finding autonomous Lagrangians\, Jacobi multiplier
s and first integrals for Li\\'{e}nard--type equations.\n\nhttps://indico.
jinr.ru/event/137/contributions/578/
LOCATION: 406A
URL:https://indico.jinr.ru/event/137/contributions/578/
END:VEVENT
BEGIN:VEVENT
SUMMARY:A Scientific Workflow System for Satellite Data Processing with Re
al-time Monitoring
DTSTART;VALUE=DATE-TIME:20170707T123000Z
DTEND;VALUE=DATE-TIME:20170707T124500Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-579@indico.jinr.ru
DESCRIPTION:Speakers: Minh Duc Nguyen (Skobeltsyn Institute of Nuclear Phy
sics\, Lomonosov Moscow State University)\nFully automatic processing of s
atellite data is a dream for every space weather scientist. In fact\, a st
reamlined scientific workflow system that can process satellite data autom
atically and track the details of the data processing history is critical
for the efficient handling of fundamental routines used in space weather r
esearch. The information that describes the details of data processing his
tory is referred to as “provenance” which plays an important role in m
ost of the existing workflow management systems and also space weather mod
els that use data provided by such systems. The proper scope\, representat
ion\, granularity\, and implementation of a workflow management system can
vary from domain to domain and pose a number of challenges for an efficie
nt pipeline design. This paper provides a case study on satellite data pro
cessing\, storage\, and distribution in the space weather domain by introd
ucing the SDDS system. The approach proposed in this paper was evaluated t
hrough real-world scenarios and addresses the provenance scope\, represent
ation\, granularity\, and implementation issues related to satellite data
processing. Although SDDS is used as a primary data provider for space wea
ther models at SINP MSU\, the system can potentially be adapted to a wide
range of data processing scenarios in other fields of physics.\n\nhttps://
indico.jinr.ru/event/137/contributions/579/
LOCATION: LIT Conference Hall
URL:https://indico.jinr.ru/event/137/contributions/579/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Algorithm for the orthogonal fast discrete spherical Bessel transf
orm on a uniform grid
DTSTART;VALUE=DATE-TIME:20170704T111500Z
DTEND;VALUE=DATE-TIME:20170704T113000Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-580@indico.jinr.ru
DESCRIPTION:Speakers: Vladislav Serov (Saratov State University)\nWe propo
se an algorithm for the orthogonal fast discrete spherical Bessel transfor
m on a uniform grid. Our approach is based upon the spherical Bessel trans
form factorization into the two subsequent orthogonal transforms\, namely
the fast Fourier transform and the orthogonal transform founded on the der
ivatives of the discrete Legendre orthogonal polynomials. The method utili
ty is illustrated by its implementation for the numerical solution of the
three-dimensional time-dependent Schroedinger equation.\n\nhttps://indico.
jinr.ru/event/137/contributions/580/
LOCATION: 406A
URL:https://indico.jinr.ru/event/137/contributions/580/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Strange particles reconstruction by the missing mass method
DTSTART;VALUE=DATE-TIME:20170707T093000Z
DTEND;VALUE=DATE-TIME:20170707T094500Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-581@indico.jinr.ru
DESCRIPTION:Speakers: Pavel Kisel (Frankfurt Uni\, JINR)\nThe main goal of
modern heavy-ion experiments is a comprehensive study of the QCD phase di
agram\, in a region of Qaurk-Gluon Plasma (QGP) and possible phase transit
ion to QGP phase.\nOne of possible signals of QGP formation is enhanced st
rangeness production. Reconstruction of Σ particles together with other s
trange particles completes the picture of strangeness production. Σ+ and
Σ- have all decay modes with at least one neutral daughter\, which can no
t be registered by the CBM detector.\nFor their identification the missing
mass method is proposed: a) tracks of the mother (Σ-) and the charged da
ughter (π-) particles are reconstructed in the tracking system\; b) the n
eutral daughter particle (n) is reconstructed from these tracks\; c) a mas
s constraint is set on the reconstructed neutral daughter\; d) the mother
particle is constructed of the charged and reconstructed neutral daughter
particles and the mass spectrum is obtained\, by which the particle can be
identified.\nThe method can be applied for other strange particles too. I
n total 18 particle decays with neutral daughter are now included into phy
sics analysis.\n\nhttps://indico.jinr.ru/event/137/contributions/581/
LOCATION: LIT Conference Hall
URL:https://indico.jinr.ru/event/137/contributions/581/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Parallel evolutionary optimization algorithms for peptide-protein
docking
DTSTART;VALUE=DATE-TIME:20170704T113000Z
DTEND;VALUE=DATE-TIME:20170704T114500Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-582@indico.jinr.ru
DESCRIPTION:Speakers: Sergey Poluyan (Dubna State University)\nIn this stu
dy we examine the prospect of using evolutionary optimization algorithms i
n protein-peptide docking. We present the main assumptions that reduce the
docking problem to the continuous global optimization problem and provide
a way of using evolutionary optimization algorithms. The Rosetta all-atom
force field was used for structural representation and energy scoring. We
describe the parallelization scheme and MPI/OpenMP realization of the con
sidered algorithms. We demonstrate the efficiency and the performance for
some algorithms which were applied to a set of benchmark complexes.\n\nhtt
ps://indico.jinr.ru/event/137/contributions/582/
LOCATION: LIT Conference Hall
URL:https://indico.jinr.ru/event/137/contributions/582/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Renormdynamics (RD) and Generalized Analytic Functions (GAF)
DTSTART;VALUE=DATE-TIME:20170703T131500Z
DTEND;VALUE=DATE-TIME:20170703T133000Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-583@indico.jinr.ru
DESCRIPTION:Speakers: Nugzar Makhaldiani (JINR)\nConcise introduction in R
D and GAF with some applications.\n\nhttps://indico.jinr.ru/event/137/cont
ributions/583/
LOCATION: 310
URL:https://indico.jinr.ru/event/137/contributions/583/
END:VEVENT
BEGIN:VEVENT
SUMMARY:On Interpolational Approximation of Nonlinear Differential Operat
ors of the Second Order in Partial Derivatives
DTSTART;VALUE=DATE-TIME:20170703T131500Z
DTEND;VALUE=DATE-TIME:20170703T133000Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-584@indico.jinr.ru
DESCRIPTION:Speakers: Leonid Yanovich (Institute of Mathematics National A
cademy of Sciences of Belarus)\n\\documentclass{article}\n\n\\addtolength{
\\textheight}{-10mm}\n\\addtolength{\\topmargin}{-5mm}\n\n\\pagestyle{plai
n}\n\n\\def\\title#1{\\begin{center}#1\\end{center}}\n\n\\def\\author#1{\\
centerline{\\small{\\textsc{#1}}}}\n\n\\def\\address#1#2{\\begin{center}\\
small\\emph{#1}\\\\E-mail: \\texttt{#2}\\end{center}}\n\n\\def\\refname{{\
\small References}}\n\n\\begin{document}\n\\title{\\textsc{On Interpolatio
nal Approximation\nof Nonlinear Differential Operators of the Second Ord
er in\nPartial Derivatives{}}\\footnote{This work is supported by\nBelarus
ian Republican Foundation for Fundamental Research (project\n16D-002).}}\n
\n\\author{L.~A.~Yanovich and M.~V.~Ignatenko}\n\n\\address{Institute of M
athematics\, \\\\ National Academy of Sciences of Belarus\, \\\\\nSurganov
a Str. 11\, \\\\\n220072 Minsk\, Belarus}{yanovich@im.bas-net.by\, ignaten
komv@bsu.by}\n\n\\bigskip\n\n\\small\n\nWe consider the differential opera
tors $F:C^{2} \\left(T\\times\nS\\right)\\to Y$ of the second order in pa
rtial derivatives of the\nform $$ F\\left(x\\right)=f\\left(t\,s\,x\\left(
t\,s\\right)\,x'_{t}\n\\left(t\,s\\right)\,x'_{s} \\left(t\,s\\right)\,x''
_{t^{2} }\n\\left(t\,s\\right)\,x''_{t\,s} \\left(t\,s\\right)\,x''_{s^{2}
}\n\\left(t\,s\\right)\\right)\, \\eqno (1)$$ where $x'_{t}\n\\left(t\,s\
\right)=\\frac{\\partial x\\left(t\,s\\right)}{\\partial t\n }\,$\n$x''_{t
^{2} } \\left(t\,s\\right) =\\frac{\\partial ^{2}\nx\\left(t\,s\\right)}{\
\partial t^{2} }\,$ $x''_{t\,s} \\left(t\,s\\right)=\n\\frac{\\partial ^{2
} x\\left(t\,s\\right)}{\\partial t \\partial s }\,$\n the derivative $x'
'_{t\,s}\n\\left(t\,s\\right)=x''_{s\,t} \\left(t\,s\\right)$\, the space
$C^{2}\n\\left(T\\times S\\right)$ is the space of two times continuously\
ndifferentiable on $T\\times S\\subseteq R^{2} $ functions\n$x\\left(t\,s\
\right)\,$ the function $y=f\\left(t\,s\,u_{0} \,u_{1}\n\,...\,u_{5} \\rig
ht)$ is defined on a rectangle $\\Omega =T\\times\nS\\times T_{0} \\times
T_{1} \\times \\cdots \\times T_{5} \,$ $T_{i} $\nare sets of the number
line $\\left(i=0\,1\,...\,5\\right)$\, and $Y$ is\na function space.\n\nHe
re is the Lagrange interpolation formula for the operators (1):\n$$L_{n} \
\left(F\;x\\right)=F\\left(x_{0} \\right)+ \\sum _{k=1}^{n} \\\,\n\\int _{
0}^{1} \\sum _{i\,j=0\; \\\, i+j\\le 2} ^{2} \\frac{\\partial\n}{\\partial
\\left(\\frac{\\partial ^{i+j} \\upsilon _{k} }{\\partial\nt^{i}\n\\parti
al s^{j} } \\right)} F\\left(\\upsilon _{k} \\left(t\,s\,\\tau\n\\right)\
\right) \\times $$ $$\\times\\frac{\\partial ^{i+j} }{\\partial\nt^{i}\n\\
partial s^{j} } \\left\\{\\frac{l_{n\,k}\n\\left(x\\left(t\,s\\right)\\rig
ht)}{\\sigma _{n}\n\\left(x\\left(t\,s\\right)\\right)} \\left(x_{k} \\lef
t(t\,s\\right)-x_{0}\n\\left(t\,s\\right)\\right)\\right\\}d\\tau \, \\eqn
o (2)$$ where the\nfunctions $\\upsilon _{k} =\\upsilon _{k} \\left(t\,s\,
\\tau\n\\right)=x_{0} \\left(t\,s\\right)+\\tau \\left(x_{k}\n\\left(t\,s\
\right)-x_{0} \\left(t\,s\\right)\\right)$\n$\\left(k=1\,2\,...\,n\\right)
\,$ $l_{n\,k} \\left(x\\right)$ are\nfundamental polynomials of the $n$-de
gree with respect to the\nChebyshev system of functions $\\mathop{\\left\
\{\\varphi _{k}\n\\left(x\\right)\\right\\}}\\nolimits_{k=0}^{n} $\, $l_{
n\,k} (x_{j}\n)=\\delta _{kj} $ is the Kronecker symbol $(k\,j=0\,1\,...\,
n)\,$ and\n$\\sigma _{n} \\left(x\\right)=\\sum _{k=0}^{n}l_{n\,k} \\left(
x\\right)\n\\\, $ is a constant or a variable value. The polynomial (2)\ns
atisfies to the following interpolation conditions:\n\\[L_{n} \\left(F\;x_
{k} \\right)=F\\left(x_{k} \\right)\, \\left(k=0\,1\,...\,n\\right).\\]\n\
nFor the interpolation error $r_{n}\n\\left(x\\right)=F\\left(x\\right)-L_
{n} \\left(F\;x\\right)$\, where\n$L_{n} \\left(F\;x\\right)$ is interpola
tion polynomial (2)\, the\nfollowing representation holds:\n\\[r_{n} \\lef
t(x\\right)=\\sum _{k=1}^{n+1} \\\, \\int _{0}^{1}\n\\sum _{i\,j=0\; \\\,
i+j\\le 2} ^{2}\\frac{\\partial }{\\partial\n\\left(\\frac{\\partial ^{i+j
} \\upsilon _{k} }{\\partial t^{i} \\partial s^{j} } \\right)}\nF\\left(\\
upsilon _{k} \\left(t\,s\,\\tau \\right)\\right) \\times \\]\n\\[\\times \
\frac{\\partial ^{i+j} }{\\partial t^{i} \\partial s^{j} }\n \\left\\{\\le
ft(\\frac{l_{n+1\,k} \\left(x\\left(t\,s\\right)\\right)}{\\sigma _{n+1}\n
\\left(x\\left(t\,s\\right)\\right)} -\\frac{l_{n\,k} \\left(x\\left(t\,s
\\right)\\right)}{\\sigma _{n}\n \\left(x\\left(t\,s\\right)\\right)} \\ri
ght)\\left(x_{k} \\left(t\,s\\right)-x_{0}\n \\left(t\,s\\right)\\right)\\
right\\}d\\tau \,\\]\nwhere $x_{n+1} =x\,$ $l_{n\,n+1} (x)\\equiv 0$.\n\nS
ome other interpolation formulas for the operator (1) are also\nconstruct
ed.\n\n\n\n\\end{document}\n\nhttps://indico.jinr.ru/event/137/contributio
ns/584/
LOCATION: 406A
URL:https://indico.jinr.ru/event/137/contributions/584/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Higher-order partial differential equations for description of the
Fermi-Pasta-Ulam and the Kontorova-Frenkel models
DTSTART;VALUE=DATE-TIME:20170707T053000Z
DTEND;VALUE=DATE-TIME:20170707T060000Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-585@indico.jinr.ru
DESCRIPTION:Speakers: Nikolay Kudryashov (National Research Nuclear Univer
sity MEPhI)\nWe consider the following dynamical system:\n\\begin{equation
}\\begin{gathered}\n\\label{I_1}\nm\\\,\\frac{d^2y_{i}}{d t}=F_{i+1\,i}-F_
{i\,i-1}-f_0\\\,\\sin{\\left(\\frac{2\\\,\\pi\\\,y_i}{a}\\right)}\, \\qqua
d\n(i=1\,\\ldots\,N)\,\n\\end{gathered}\\end{equation}\nwhere $y_i$ measur
es the displacement of the i-th mass from equilibrium in time $t$\, the fo
rce $F_{i+1\,i}$ describes the nonlinear interaction between atpms disloca
tions in the crystal lattice in case of dislocations\n\\begin{equation}\\b
egin{gathered}\n\\label{I_2}\nF_{i+1\,i}=\\gamma\\\,(y_{i+1}-y_i)+\\alpha\
\\,(y_{i+1}-y_i)^2+\\beta\\\,(y_{i+1}-y_i)^3\,\n\\end{gathered}\\end{equat
ion}\nand $f_0$\, $a$\, $\\gamma$\, $\\alpha$\, $\\beta$ are constant para
meters of system \\eqref{I_1}.\n\nThe system of equations \\eqref{I_1} is
the generalization of some well-known dynamical systems. At $\\alpha=0$ an
d $\\beta=0$ the system of equations \\eqref{I_1} is the mathematical mode
l introduced by Frenkel and Kontorova for the description of dislocations
in the rigid body \\cite{Frenkel}. In this model it was suggested that the
influence of atoms in the crystal is taken into account by term $f_0\\\,\
\sin {\\frac{2\\\,\\pi\\\,y_i}{a}}$ but the atoms in case of dislocations
interact by means of linear low. Assuming that $N\\rightarrow \\infty$ and
$h\\rightarrow 0$ where $h$ is the distance between atoms\, we can get th
e Sine-Gordon equation.\n\nIn case of $f=0$ and $\\beta=0$ system of equat
ions \\eqref{I_1} is the well-known Fermi-Pasta-Ulam model \\cite{Fermi} w
hich was studied many times. It is known that the Fermi-Pasta-Ulam model
is transformed at $N\\rightarrow \\infty$ and $h\\rightarrow 0$ to the Kor
teweg-de Vries equation \\cite{Kruskal}.\n\nThe main result of work \\cite
{Kruskal} was the introduction of solitons as solutions of the Koryeweg-de
Vries equation.\nIt was shown in 1967 that the Cauchy problem for this eq
uation can be solved by the Inverse Scattering transform \\cite{Gardner}.\
n\nAssuming $f_0=0$\, $\\alpha \\neq 0$ and $\\beta \\neq 0$ at $N \\righ
tarrow \\infty$ and $h \\rightarrow 0$ one can find the modified Korteweg-
de Vries equation for the description of nonlinear waves.\n\nIn papers \\
cite{ Kudr15\, Kudr17} the author took into account high order terms in th
e Taylor series for the description of nonlinear waves in the Fermi-Pasta-
Ulam and the Kontorova-Frenkel models assuming that $\\alpha \\neq 0$ and
$\\beta \\neq 0$ and did not obtain nonlinear integrable differential equ
ations in mass chain. Here we assume that the interaction between disloca
tions in crystal is described by means of nonlinear low at $\\alpha \\neq
0 $ and $\\beta \\neq 0$ and consider the other equations. The aim of this
talk is to present the nonlinear partial differential equations correspon
ding to dynamical system \\eqref{I_1} and to discuss the properties of the
se equations.\n\nhttps://indico.jinr.ru/event/137/contributions/585/
LOCATION:
URL:https://indico.jinr.ru/event/137/contributions/585/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Anomalous Scaling in Compressible Kazantsev-Kraichnan Model with S
patial Parity Violation
DTSTART;VALUE=DATE-TIME:20170703T123000Z
DTEND;VALUE=DATE-TIME:20170703T124500Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-586@indico.jinr.ru
DESCRIPTION:Speakers: Martin Menkyna (Slovak Academy of Sciences)\nThe fie
ld theoretic renormalization group and the operator product expansion are
used for the investigation of the inertial-range anomalous scaling behavio
ur of the single-time correlation functions of the weak magnetic field wit
hin the framework of the compressible Kazantsev-Kraichnan rapid change mod
el with spatial parity violation of the corresponding conductive turbulent
environment. Two-loop expressions for the critical dimensions of the lead
ing composite operators in the operator product expansion are found as fun
ctions of the compressibility and helicity parameters. Their influence on
the hierarchy of the anisotropic contributions to the anomalous dimensions
is discussed and it is shown that the crucial role is played by the compo
site operator near the isotropic shell in agreement with the Kolmogorov is
otropy restoration hypothesis. It is shown that the presence of the helici
ty as well as that of the compressibility of the electrically conductive t
urbulent environment can have a nontrivial impact on the scaling propertie
s of the correlation functions of the passive magnetic field\, namely\, to
make the anomalous scaling more pronounced than in the incompressible and
non-helical case.\n\nEmail: menkyna@saske.sk\, jurcisin@saske.sk\, jurcis
ine@saske.sk\n\nhttps://indico.jinr.ru/event/137/contributions/586/
LOCATION: 310
URL:https://indico.jinr.ru/event/137/contributions/586/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Modeling of T-Cell polarization
DTSTART;VALUE=DATE-TIME:20170704T111500Z
DTEND;VALUE=DATE-TIME:20170704T113000Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-587@indico.jinr.ru
DESCRIPTION:Speakers: Ivan Hornak (Saarland University)\nThe repositioning
of the microtubule organizing center is a part of many fundamental biolog
ical processes. It occurs in T-cell lymphocyte immediately after antigen p
resenting cell is recognized by T-cell. The Dynein's effort to walk to the
minus end of the microtubule while being anchored at one place results in
microtubule's sliding\, and\, hence in the repositioning of the microtubu
le organizing center and in the rotation of the whole microtubule structur
e. This process was experimentally observed\, but its inner dynamics and k
ey features remained poorly understood. We developed a physical model of m
icrotubules and their organizing centre. By taking account of the cell's i
nner geometry\, various forces acting in the cell and contact between micr
otubules and other organelles\, we achieved to perform realistic simulatio
n of the repositioning. The output of the model is in compliance with expe
rimental observables. The results can cast a new light on the intracellula
r dynamics that is a key part of many biological processes. The influence
of the rotation of microtubule structure on the intracellular patterns of
concentration of calcium ions is explained.\n\nhttps://indico.jinr.ru/even
t/137/contributions/587/
LOCATION: LIT Conference Hall
URL:https://indico.jinr.ru/event/137/contributions/587/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Symbolic-numerical modeling of the influence of damping moments on
satellite dynamics
DTSTART;VALUE=DATE-TIME:20170706T114500Z
DTEND;VALUE=DATE-TIME:20170706T120000Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-588@indico.jinr.ru
DESCRIPTION:Speakers: Sergey Gutnik (Moscow Institute of Physics and Techn
ology)\nThe dynamics of a satellite in a circular orbit under the influenc
e of gravitational and active damping torques\, which are depend on the pr
ojections of the angular velocity of the satellite is investigated [1]. Su
ch active damping torques are proportional to the projections of angular v
elocities onto the axes of the satellite body coordinate system and can be
provided by using the angular velocity sensor. Computer algebra methods f
or determination of all equilibrium orientations of the satellite in the o
rbital coordinate system with given damping torque and given principal cen
tral moments of inertia are used. The equilibrium orientations are determi
ned by real roots of the system of nonlinear algebraic equations. An algor
ithm for construction of the Groebner basis for solving the problem was ap
plied.\nThe conditions of the equilibria existence depending on three damp
ing parameters were obtained by the analysis of real roots of algebraic eq
uations from the constructed Groebner basis.\nThe conditions of asymptotic
stability of the satellite's equilibria were determined as a result of th
e analysis of linearized equations of motion using Routh-Hurwitz criterion
. The integration of the differential equations of satellite attitude moti
on has been done numerically. The transition decay processes of spatial os
cillations of the satellite at different damping parameters have been stud
ied.\n\nhttps://indico.jinr.ru/event/137/contributions/588/
LOCATION: LIT Conference Hall
URL:https://indico.jinr.ru/event/137/contributions/588/
END:VEVENT
BEGIN:VEVENT
SUMMARY:High-Accuracy Finite Element Method for Elliptic Boundary-Value Pr
oblems
DTSTART;VALUE=DATE-TIME:20170706T111500Z
DTEND;VALUE=DATE-TIME:20170706T113000Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-589@indico.jinr.ru
DESCRIPTION:Speakers: Alexander Gusev (Laboratory of Information Technolog
ies Joint Institute for Nuclear Research)\nHigh-accuracy finite element me
thod for elliptic boundary-value problems is presented.\nThe basis functio
ns of finite elements are high-order polynomials\, determined from a speci
ally constructed set of values of the polynomials themselves\, their parti
al derivatives\, and their derivatives along the directions of the normals
to the boundaries of finite elements.\nSuch a choice of the polynomials a
llows us to construct a piecewise polynomial basis continuous on the bound
aries of elements together with the derivatives up to a given order. In pr
esent talk we show how this basis is applied to solve elliptic boundary va
lue problems in the limited domain of multidimensional Euclidean space\, s
pecified as a polyhedron.\nThe efficiency and the accuracy order of the fi
nite element scheme\, algorithm and program are demonstrated by the exampl
e of exactly solvable boundary-value problem for a triangular membrane\,
depending on the number of finite elements of the partition of the domain
and the number of piecewise polynomial basis functions.\n\nhttps://indico.
jinr.ru/event/137/contributions/589/
LOCATION: LIT Conference Hall
URL:https://indico.jinr.ru/event/137/contributions/589/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Kinetic\, Monte-Carlo and Multiparticle Models of the Processes in
Photosynthetic Membrane
DTSTART;VALUE=DATE-TIME:20170707T050000Z
DTEND;VALUE=DATE-TIME:20170707T053000Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-590@indico.jinr.ru
DESCRIPTION:Speakers: Galina Riznichenko (Lomonosov Moscow State Universi
ty\, MSU)\nProcesses in photosynthetic membrane proceed at wide time scale
s from 10-12s-1 (charge separation in photosynthetic reaction centers of P
hotosystems I and II) till dozen of milliseconds (interactions with Calvin
-Benson cycle of CO2 fixation). \nThe paper presents the results of the wo
rk on kinetic and computer modeling performed at the Dept. of Biophysics\,
Biological faculty MSU. Kinetic models of the primary photosynthetic proc
esses in thylakoid membrane are based on systems of ordinary differential
equations\, describing the processes in multi-enzyme complexes of Photosys
tem I\, Photosystem II and Cytochrome b6f complex\, coupled to transmembra
ne proton and other ions transport and generation of transmembrane electro
chemical potential. These models describe simultaneous kinetic changes of
different variables\, including concentrations of electron carriers at dif
ferent redox states\, electrical and electrochemical potential values\; fl
uorescence induction and adequately simulates a set of fluorescence induct
ion curves experimentally recorded at different light intensities under co
ntinuous illumination and after a short laser flash. \nMonte-Carlo models
simulate the consequence of individual elementary stages of electron-trans
port processes in ensembles of several millions electron transport chains\
, which number is comparable with the number of photosynthetic reaction ce
nters in a real algae cell. Models of this type could be simply modified a
ccording to the data of electron transport chain organization at different
growth conditions.\nThe multiparticle computer models describe processes
proceeding in the simulated membrane “scene”\, which includes stroma\,
lumen and in transmembrane compartments constructed according to structur
al data. We simulate interactions of ensembles of molecules in solution an
d in the heterogeneous interior of a cell. In the models protein molecules
move according to the laws of Brownian dynamics\, mutually orient themsel
ves in the electrical field and form complexes on the 3D scene. After the
interacting molecules approach each other and produce the preliminary comp
lex\, we switch off molecular dynamic procedure to simulate intermolecular
conformation activity leading to the formation of the final complex\, in
which the redox reaction occurs. The method allows to visualize the proces
ses of molecule interactions and to evaluate the rate constants for protei
n complex formation reactions in the solution and in the interior of the p
hotosynthetic membrane. 3D multiparticle computer models for simulation of
complex formation kinetics for plastocyanin with photosystem 1 and cytoch
rome bf complex\, ferredoxin with photosystem 1 and ferredoxin:NADP+-reduc
tase are considered. Effects of ionic strength are featured for wild type
and mutant proteins. The computer multiparticle models demonstrate non-mon
otonic dependences of complex formation rates on the ionic strength as the
result of long-range electrostatic interactions. The models of interactio
ns Cytf-Pc and Pc-PSI in lumen of thylakoid\, taking into account the infl
uence of the charge of the membrane\, are developed. Directed electron tra
nsport Cytf–PSI via Pc is simulated according to experimental data. The
models reveal the role of complex geometry of the interacting proteins and
spatial organization of photosynthetic membrane. \nKinetic and multiparti
cle computer models allow to evaluate the parameters of photosynthetic pro
cesses which cannot be determined experimentally and reveal physical mecha
nism of regulation of photosynthetic electron transport and coupled proces
ses of energy transformation. \nThe work was supported by grants of the RF
BR (grants N 14-04-00302\, 14-04-00326\, 17-04-00676)\n\nhttps://indico.ji
nr.ru/event/137/contributions/590/
LOCATION:
URL:https://indico.jinr.ru/event/137/contributions/590/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The system of n-order Riccati equations: derivation\, solutions\,
applications.
DTSTART;VALUE=DATE-TIME:20170707T130000Z
DTEND;VALUE=DATE-TIME:20170707T131500Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-591@indico.jinr.ru
DESCRIPTION:Speakers: Robert Yamaleev (JINR LIT)\nAn algorithm of reductio
n of n-order differential equation into the system of n-order Riccati-type
equations is constructed. Solutions of the system of Riccati equations ar
e roots of the polynomial coefficients of which are given by the set of l
inear independent solutions of n-order differential equation. Interrelatio
ns with the Poincare model of hyperbolic space and the general complex a
lgebra are established. The physical interpretation of the obtained system
of Riccati equations is given via dynamics of the generalized classical
mechanics.\n\nhttps://indico.jinr.ru/event/137/contributions/591/
LOCATION:
URL:https://indico.jinr.ru/event/137/contributions/591/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The problem of optimal motion control for dynamical systems of fra
ctional order
DTSTART;VALUE=DATE-TIME:20170703T140000Z
DTEND;VALUE=DATE-TIME:20170703T143000Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-592@indico.jinr.ru
DESCRIPTION:Speakers: Elena Postnova (Institute of Control Sciences)\nThe
problem of optimal motion control for one-dimensional and two-dimensional
systems of fractional order is considered. To search the analytical soluti
ons of the problem the method of moments was applied. The properties of op
timal controls depending on the index of fractional index\, the control ti
me\, initial and final conditions were analyzed.\n\nhttps://indico.jinr.ru
/event/137/contributions/592/
LOCATION:
URL:https://indico.jinr.ru/event/137/contributions/592/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Web Platform for Sharing Modeling Software in the Field of Nonline
ar Optics
DTSTART;VALUE=DATE-TIME:20170704T111500Z
DTEND;VALUE=DATE-TIME:20170704T113000Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-593@indico.jinr.ru
DESCRIPTION:Speakers: Yulia Dubenskaya (SINP MSU)\nWe present a web platfo
rm intended for sharing of software programs for computer modeling of nonl
inear optics phenomena. Nonlinear optic is a rapidly evolving area of mode
rn physical research and engineering with many important applications such
as fiber-optic communications\, nonlinear spectroscopy\, diagnostic of no
n-stationary and inhomogeneous processes in plasma and gas phases\, laser
biomedicine\, etc. Successful development of optical devices requires comp
licated modeling of physical processes that occur in components of devices
and comprehensive database of optical properties of used materials (see e
.g.\, [1]). Many developers of application software\, including those for
computer modeling\, have the intention to share their products for use by
other researchers. However\, individual developing and maintaining hardwar
e and software infrastructure supporting the delivery of a product is disa
dvantageous from a financial point of view and from the point of view of t
ime spent on its creation. Therefore\, a very important task is to develop
a web platform where users of application software\, presented in the for
m of web services\, and their providers be able to directly interact. \n\n
The suggested platform is build on the top of the HUBZero open-source mid
dleware (http://hubzero.org) [2]. It provides services for application sof
tware installation and includes a set of tools for simplifying the interac
tion between the software developers and resource administrators. In parti
cular\, the platform comprise tools for transforming application software
(with allowance for certain rules for API) into software as aservice (SaaS
). It also provides facilities for supporting communities of users (includ
ing on-line seminars\, network conferences\, storages of domain-specific i
nformation\, etc.). General architecture of the web platform have the thre
e-layer architecture. The first layer is the frontend that provides the us
er web interface\; the second layer consists of the platform engine respon
sible for job submitting\, obtaining results\, the system of remote softwa
re deployment\, the administration system (responsible for user management
\, tool configuration\, etc.)\; the third layer is a resource manager that
exposes data and compute resources to the preceding layer. The web platfo
rm uses the technology of virtual machines [3]\, which provide both securi
ty (software isolation) and an operating system required for a given appli
cation software. Users can interact with the platform through the web brow
ser interface. \n\nSuch a resource has no analogues in the field of nonlin
ear optics and will be created for the first time\, therefore allowing res
earchers to access high-performance computing resources that will signific
antly reduce the cost of the research and development process. \n\nReferen
ces\n[1] A.V. Smith\, Crystal nonlinear optics with SNLO examples. AS-Pho
tonics\, 2015\; \n L.C. GmbH\, “LASCAD 3.6 manual\,” 2014. htt
ps://www.las-cad.com.\n[2] McLennan\, M. and Kennell\, R.\, HUBzero: A pla
tform for dissemination and collaboration in computational science and eng
ineering\, Comput. Sci. Eng.\, 2010\, vol. 12\, no. 2\, pp. 48–52.\n[3]
Smith\, J. and Nair\, R.\, Virtual Machines: Versatile Platforms for Syste
ms and Processes\, Boston: Morgan Kaufmann\, 2005.\n\nhttps://indico.jinr.
ru/event/137/contributions/593/
LOCATION: 406B
URL:https://indico.jinr.ru/event/137/contributions/593/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Computer Modeling of a Dispersed Storage System for Private Data o
n Public Resources in P2P Networks for Determining the Optimal Values of i
ts Parameters
DTSTART;VALUE=DATE-TIME:20170704T110000Z
DTEND;VALUE=DATE-TIME:20170704T111500Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-594@indico.jinr.ru
DESCRIPTION:Speakers: Stanislav Polyakov (Lomonosov Moscow State Universit
y)\nWe present a project devoted to a development of a reliable\, secure\,
and convenient dispersed storage system for private data on public resour
ces in the Internet based on peer-to-peer (P2P) networks [1\,2]\, as an al
ternative to centralized solutions\, including clouds. Novelty of the offe
red project is the research of the behavior of dispersed storage system (D
SS) and determining the optimal parameters of its operation under the cond
itions of high volatility of resources within a P2P network. The proposed
method of solving the problem is the computer modeling and analysis of the
various algorithms of routing of private data between its owners and the
providers of the resources based on computer modeling\, and multi-objectiv
e optimization of the parameters of information dispersal algorithms (IDA)
[3] under the conditions of dynamically changing P2P network. In particul
ar\, effective integration of IDA in DSS implies mutual optimization of th
e choice of a particular variant of IDA\, type (structured\, unstructured\
, hybrid) of topology of the overlay P2P-networks\, search and data routin
g algorithms\, techniques for checking retrievability of undistorted data
stored on a particular node of the network as well as the timely restorati
on of lost fragments in dynamically changing network.\n\nThere is a number
of approaches and methods for the solution of tasks of such multi-objecti
ve optimization [4]. In particular\, in the project it is supposed to use
the adapted version of a method of the weighed sums (in more general conte
xt such approach is called a scalarization of the multi-objective optimiza
tion). Up to now these methods were not applied to assessment of efficienc
y of data stores on the basis of peer-to-peer networks. The parameters of
DSS operation will be optimized for different external conditions and dyna
mic change of a network\, in particular at different speeds and types of n
odes disappearing (churn\, failure\, crash)\, and also joining of the netw
ork by new nodes. The study of the functioning of the network and the sear
ch for the optimal parameters of its operation will be based on computer s
imulation that will estimate functionality\, performance\, scalability an
d reliability of the DSS.\n\nReferences\n[1] J. Buford\, H. Yu\, and E.K
. Lua. P2P Networking and Applications. Morgan Kaufmann. 2008.\n[2] A. M
alatras\, State-of-the-art survey on P2P overlay networks in pervasive com
puting environments\, Journal of Network and Computer Applications 55 (201
5): 1-23.\n[3] M. O. Rabin\, “Efficient dispersal of information for sec
urity\, load balancing and fault tolerance\,” in Journal of the ACM\, 36
(2):335–348\, 1989\; A. Dimakis et al.\, A survey on network codes for
distributed storage\, Proceedings of the IEEE 99\, no. 3 (2011): 476-489\n
[4] M. Ehrgott\, Multicriteria Optimization\, Birkhauser\, 2005\; R.E. S
teuer\, Multiple Criteria Optimization: Theory\, Computations\, and Applic
ation. - New York: John Wiley and Sons\, 1986.\n\nhttps://indico.jinr.ru/e
vent/137/contributions/594/
LOCATION: 406B
URL:https://indico.jinr.ru/event/137/contributions/594/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Petrov-Galerkin Finite Element Method for Fractional Advection-Di
spersion Equations
DTSTART;VALUE=DATE-TIME:20170703T083000Z
DTEND;VALUE=DATE-TIME:20170703T090000Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-595@indico.jinr.ru
DESCRIPTION:Speakers: Raytcho Lazarov (Texas A&M University)\nFirst\, we s
hall make a short introduction the concepts of fractional calculus and dif
ferential equations of fractional order that include both\, steady-state a
nd time dependent problems. This type of problems arise in mathematical mo
deling of asymmetric super-diffusion processes in highly heterogeneous med
ia. \n\nFurther\, we shall present variational formulations of Petrov-Gale
rkin type for one-dimensional fractional boundary value problems with eith
er a Riemann-Liouville or Caputo derivative of order $\\alpha\\in(3/2\, 2)
$ in the leading term and involving both convection \nand reaction terms.
The well-posedness of the formulations\nand sharp regularity pickup of the
weak solutions are established. \n\nA novel finite element method is deve
loped\, which employs continuous piecewise linear finite elements and ``sh
ifted'' fractional powers for the trial and test space\, respectively. The
new approach has a number of distinct features as it allows deriving opti
mal error \nestimates in both $L^2$- and $H^1$-norms and produces well con
ditioned linear systems\, since the leading term of the stiffness matrix i
s diagonal matrix for uniform meshes. Further\, in the Riemann-Liouville c
ase\, an enriched FEM is proposed to improve the convergence. Extensive nu
merical results are presented to\nverify the theoretical analysis and robu
stness of the numerical scheme.\n\nhttps://indico.jinr.ru/event/137/contri
butions/595/
LOCATION:
URL:https://indico.jinr.ru/event/137/contributions/595/
END:VEVENT
BEGIN:VEVENT
SUMMARY:High-Accuracy Finite Element Method for the 2D Parametric Elliptic
Boundary-Value Problems
DTSTART;VALUE=DATE-TIME:20170706T113000Z
DTEND;VALUE=DATE-TIME:20170706T114500Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-596@indico.jinr.ru
DESCRIPTION:Speakers: Sergue Vinitsky (BLTP JINR)\nHigh-accuracy finite el
ement method for solving the 2D parametric elliptic self-adjoint boundary-
value problems is presented. The triangular elements and new high-order fu
lly symmetric Gaussian quadratures with positive weights\, and no points a
re outside the triangle (PI type) is applied. The program calculates with
the given accuracy the eigenvalues\, the surface eigenfunctions and the
ir first derivatives with respect to the parameter of the BVP for parametr
ic self-adjoint elliptic differential equation with the mixed Dirichlet-Ne
umann type boundary conditions on the 2D polygonal domain\, and the potent
ial matrix elements\, expressed as integrals of the products of surface ei
genfunctions and/or their first derivatives with respect to the parameter.
We demonstrated an efficiency of finite element schemes and program by m
eans of benchmark calculations the 3D boundary-value problem for Helium at
om bound states in the framework of Kantorovich method.\n\nhttps://indico.
jinr.ru/event/137/contributions/596/
LOCATION: LIT Conference Hall
URL:https://indico.jinr.ru/event/137/contributions/596/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Beyond the phenomenology of the BCS model
DTSTART;VALUE=DATE-TIME:20170706T110000Z
DTEND;VALUE=DATE-TIME:20170706T111500Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-597@indico.jinr.ru
DESCRIPTION:Speakers: Dragos-Victor Anghel (IFIN-HH)\nBy a reevaluation of
the grandcanonical partition function\, we show that the phenomenology of
the BCS model is much richer than previously known: the phase transition
may be discontinuous (the energy gap has a jump at the phase transition te
mperature)\, there may be two solutions for the energy gap at the same tem
perature\, etc. We present both zero temperature [1] and finite temperatur
e results [2].\n[1] D. V. Anghel\, arXiv:1609.07931.\n[2] D. V. Anghel and
G. A. Nemnes\, Physica A 464\, 74 (2016)\n\nhttps://indico.jinr.ru/event/
137/contributions/597/
LOCATION: 310
URL:https://indico.jinr.ru/event/137/contributions/597/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Functional integral approach to system of stochastic differential
equations
DTSTART;VALUE=DATE-TIME:20170706T114500Z
DTEND;VALUE=DATE-TIME:20170706T120000Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-599@indico.jinr.ru
DESCRIPTION:Speakers: Victor Malyutin (Institute of Mathematics National A
cademy of Sciences of Belarus)\nVarious physical\, chemical\, and biologic
al systems with fluctuations or noise are described by stochastic differen
tial equations (SDEs). Constructing a SDEs for the modeled system such tha
t the stochastic part is related to the structure of the system is conside
red in [1\, 2]. \nEvaluation of probability density function (PDF) and oth
er quantities describing a solution of system of SDEs is considered in thi
s work. To solve this problem we use the Onsager-Machlup functional [3] to
represent a PDF through a functional integral. In the general case\, we c
annot find a PDF on a small time interval Δt corresponding to an arbitrar
y SDE. However\, we can find an expression for a PDF on a small time inter
val Δt which is true up to summands of orders higher than one with respec
t to Δt. Using this expression we can write a PDF in the form of function
al integral. Case of system of SDEs is more complicated than case of SDEs.
Therefore we consider the Onsager-Machlup functional technique only for t
he flat space when the diffusion matrix for system of SDEs defines a Riema
nnian space with vanishing curvature.\nA method for the approximate evalua
tion of the arising functional integrals is considered. Following this met
hod we distinguish among all trajectories the classical trajectory for whi
ch the action takes the extreme value. The classical trajectory is found a
s the solution of the multidimensional Euler-Lagrange equation. Further\,
to compute the integral\, we use the decomposition of action with respect
to the classical trajectory.\nFor SDE that is for one-dimensional case thi
s method is considered in [4].\nThis work was partially supported by a gra
nt of the Belarussian Republic’s Fund for Basic Research (project F16D-0
02).\n\nREFERENCES\n\n[1] D. S. Kulyabov and A. V. Demidova\, "Introductio
n of self-consistent term in stochastic population model equation\,"Vestn.
RUDN\, Ser. Mat. Inform. Fiz.\, No. 3\, 69-78 (2012).\n[2] A. V. Demidova
\, M. N. Gevorkian\, A. D. Egorov\, D. S. Kuliabov\, A.V. Korolkova\, and
L. A. Sevastianov\, "Influence of stochastization on one-step models\,"Ves
tn. RUDN\, Ser. Mat. Inform. Fiz.\, No. 1\, 71-85 (2014).\n[3] F. Langouch
e\, D. Roekaerts\, and E. Tirapegui\, Functional integration and Semi-Clas
sical Expansions (D. Reidel\, Dordrecht\, 1982).\n[4] E.A. Ayryan\, A.D. E
gorov\, D.S. Kulyabov\, V.B. Malyutin\, and L.A. Sevastyanov. Application
of Functional Integrals to Stochastic Equations. // Matematicheskoe Modeli
rovanie\, 2016\, Vol. 28\, No. 11\, pp. 113-125.\n\nhttps://indico.jinr.ru
/event/137/contributions/599/
LOCATION: 406A
URL:https://indico.jinr.ru/event/137/contributions/599/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Algorithm of the explicit type for porous medium flow simulation
DTSTART;VALUE=DATE-TIME:20170703T130000Z
DTEND;VALUE=DATE-TIME:20170703T131500Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-600@indico.jinr.ru
DESCRIPTION:Speakers: Marina Trapeznikova (Keldysh Institute of Applied Ma
thematics RAS)\nDevelopment of mathematical fundamentals and software for
simulation of complex fluid flows in the subsurface is one of urgent tende
ncies of industrial mathematics. Among applications of such flow modeling
there are oil-and-gas industry problems\, in particular\, the development
of perspective hydrocarbon recovery technologies\, as well as ecological p
roblems concerning the soil and groundwater contamination. \n\nThe present
work is devoted to elaboration of an original mathematical model of porou
s medium flows constructed by analogy with the quasigasdynamic system of e
quations and allowing implementation via explicit numerical methods [1]. T
he model is generalized to the case of multiphase multicomponent fluid and
takes into account possible heat sources. It also accounts for gravitatio
nal and capillary forces.\n\nThe distinguishing feature of the model is mo
dification of phase continuity equations: they get regularizing terms and
second order time derivatives with small parameters. The equations' type i
s changed from parabolic to hyperbolic\, consequently they can be approxim
ated by the three-level explicit scheme with rather a mild stability condi
tion\; convective terms are approximated by central differences. As the te
mperature of all phases and the rock is identical the system involves a si
ngle equation of the total energy conservation approximated also by an exp
licit scheme.\n\nTo ensure the critical accuracy of the solution of some l
arge-scale oil-recovery problems it is necessary to execute computations w
ith a very small space step what constrains a time step strictly. Then exp
licit schemes can gain in terms of the total computational time in compari
son with implicit schemes. Besides algorithms of the explicit type are pre
ferable as they can be easily adapted to modern HPC systems.\n\nThe propos
ed approach is verified by a number of test predictions. High parallelizat
ion efficiency is achieved on a hybrid supercomputer.\n\nThe work is suppo
rted by RFBR (grants No. 16-29-15095-ofi\, 15-01-03445\, 15-01-03654).\n\n
[1] B.N. Chetverushkin\, D.N. Morozov\, M.A. Trapeznikova\, N.G. Churbanov
a and E.V. Shil’nikov. An Explicit Scheme for the Solution of the Filtra
tion Problems // Mathematical Models and Computer Simulations\, 2010\, Vol
. 2\, No. 6\, pp. 669–677.\n\nhttps://indico.jinr.ru/event/137/contribut
ions/600/
LOCATION: LIT Conference Hall
URL:https://indico.jinr.ru/event/137/contributions/600/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Multilane traffic flow modelling using cellular automata theory
DTSTART;VALUE=DATE-TIME:20170703T131500Z
DTEND;VALUE=DATE-TIME:20170703T133000Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-601@indico.jinr.ru
DESCRIPTION:Speakers: Antonina Chechina (Keldysh Institute of Applied Math
ematics RAS)\nThe paper deals with mathematical modelling of traffic flows
on urban road networks. The presented model relates to microscopic approa
ch\, i. e. each car is considered separately and is described by its own s
et of parameters. \nThe model is based on cellular automata theory and pre
sents generalization of Nagel-Schreckenberg model [1] to a multilane case
[2]. The computational domain is a 2D lattice\, where two directions corre
spond to road length and width. A number of cells in the transverse direct
ion corresponds to a number of lanes. Each cell of the lattice can be eith
er empty or occupied by one vehicle. This approach allows vehicles to chan
ge lanes and to overtake one another. The algorithm of cell state update i
s formed by two components: lane change (if it is necessary and possible)\
, movement along the road by the rules of Nagel-Schreckenberg model. \nNum
erical realization of the model is represented in a form of the program pa
ckage CAM-2D\, that consists of two modules: User Interface and Visualizat
ion module (for setting initial conditions and modelling parameters and ca
lculations visual representation) and Computation module (for calculations
).\nComputations are carried out for each element of the road (i. e. T or
X type intersection\, strait road fragment) separately and in parallel\, t
hat allows performing calculations on various complex road networks. \nCom
putations show that CAM-2D can be used to set up optimal traffic lights re
gimes on complex road fragments. Besides that\, the program package allows
to predict the consequences of various decisions regarding road infrastru
cture changes\, such as: number of lanes increasing/decreasing\, putting n
ew traffic lights into operation\, building new roads\, entrances/exits\,
road junctions. \n\nACKNOWLEDGEMENTS: The work is supported by RFBR proje
cts № 16-31-00087\, 16-01-00347\, 15-01-03445.\n\nREFERENCES:\n[1] [1
] K. Nagel\, M. Schreckenberg\, A Cellular Automation Model for Freeway Tr
affic. J. Phys. I France\, Vol.2\, p. 2221 (1992)\n[2] Antonina Chechin
a\, Natalia Churbanova and Marina Trapeznikova\, Different Approaches to t
he Multilane Traffic Simulation // Traffic and Granular Flow ‘ 13\, M. C
hraibi et al. (Eds.)\, Springer\, pp. 361-368 (2015)\n\nKeywords: mathemat
ical modeling of traffic flows\, cellular automata\n\nhttps://indico.jinr.
ru/event/137/contributions/601/
LOCATION: LIT Conference Hall
URL:https://indico.jinr.ru/event/137/contributions/601/
END:VEVENT
BEGIN:VEVENT
SUMMARY:One principle for the identification of shape of an object
DTSTART;VALUE=DATE-TIME:20170704T140000Z
DTEND;VALUE=DATE-TIME:20170704T141500Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-602@indico.jinr.ru
DESCRIPTION:Speakers: Ivan Gostev (NRU HSE)\nProcess of recognition of the
shape of graphic objects consists of several stages. At the first stage a
s a result of processing images some set of characteristic properties of s
ome object are extracted. On the second one\, identification of object is
made by comparison of these properties with properties of the sample. Pres
ence of noise on real graphical images often distorts quality of character
istic properties. This article describes methods for the extraction of cha
racteristic properties of graphical objects and presents methods for the i
dentification of object’s shape with partly-present or distorted charact
eristic properties. The advantage of the described methods is their invari
ance to affine transformations of the shape of object\, and also high spee
d of identification independent on complexity of the object being identifi
ed.\n\nhttps://indico.jinr.ru/event/137/contributions/602/
LOCATION: 310
URL:https://indico.jinr.ru/event/137/contributions/602/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The dipolar relaxation of multiple quantum coherences as a model f
or an investigation of decoherence processes in many-qubit clusters in mul
tiple-quantum NMR
DTSTART;VALUE=DATE-TIME:20170706T133000Z
DTEND;VALUE=DATE-TIME:20170706T134500Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-603@indico.jinr.ru
DESCRIPTION:Speakers: Georgii Bochkin (Institute of Problems of Chemical P
hysics of RAS)\nQuantum decoherence is one of the most important problems
for creation of quantum devices which outperform their classical counterp
arts [1]. The performed investigations demonstrate [2] that the decoherenc
e time decreases when the number of qubits in the coherent cluster increas
es.\n We used methods of multiple-quantum (MQ) NMR [3] for the investi
gation of the decoherence processes in many-qubit clusters forming in the
course of the MQ NMR experiment. One-dimensional systems are very suitable
for the considered problem because the consistent quantum-mechanical the
ory for MQ NMR dynamics was developed [4] only for one-dimensional systems
. It was shown [4] that only MQ coherences of zeroth and plus/minus second
orders emerge in a one-dimensional chain\, initially prepared in the ther
modynamic equilibrium state\, on the preparation period of the MQ NMR expe
riment in the approximation of the nearest neighbor interactions [5]. We d
eveloped a theory describing the dipolar relaxation of the MQ coherences o
f zeroth and second orders in the finite spin chain on the evolution perio
d of the experiment which follows immediately after the preparation period
[6]. The dependencies of the intensities of the MQ NMR coherences of the
zeroth and second orders on the evolution period are obtained for various
numbers of spins in the chain. It is shown that the MQ NMR coherence of t
he zeroth order does not decay completely in the relaxation process.\n
The size of the coherent clusters forming on the preparation period is e
xpressed via the duration of this period and the space dimension. The depe
ndence of the relaxation time on the number of spins in the formed cluster
is obtained. Considering the dipolar relaxation of the MQ NMR coherence o
f the second order as a simple model of the decoherence process in the man
y-qubit system\, we found that the decoherence time slowly decreases with
the increase of the number of spins in the correlated cluster. \n \n
The work is supported by Russian Foundation of Basic Research (Grant No
. 16-03-00056) and the Program of the Presidium of RAS “Element base of
quantum computers” (Grant No. 0089-2015-0220).\n\n1. M.A.Nielsen\, I.L.
Chuang. Quantum Computation and Quantum Information. Cambridge University
Press. Cambridge ( 2000).\n2. H.G.Kroyanski\, D.Suter\, Phys.Rev.Lett.93\,
090501 (2004).\n3. J.Baum\, M.Munovitz\, A.N.Garroway\, A.Pines\, J.Chem
.Phys 83\, 2015 (1985).\n4. E.B.Fel’dman\, Appl. Magn.Reson.45\, 797 (20
14).\n5. M.Goldman\, Spin temperature and Nuclear Magnetic Resonance in So
lids\, Clarendon Press\, Oxford\, 1970.\n6. G.A.Bochkin\, E.B.Fel’dman\,
S.G.Vasil’ev\, Chem.Phys.Lett.\, accepted\n\nhttps://indico.jinr.ru/eve
nt/137/contributions/603/
LOCATION: LIT Conference Hall
URL:https://indico.jinr.ru/event/137/contributions/603/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Parallel implementation of numerical solution of few-body problem
using Feynman’s continual integrals
DTSTART;VALUE=DATE-TIME:20170703T113000Z
DTEND;VALUE=DATE-TIME:20170703T114500Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-604@indico.jinr.ru
DESCRIPTION:Speakers: Mikhail Naumenko (Joint Institute for Nuclear Resear
ch)\nModern parallel computing algorithm has been applied to the solution
of the few-body problem. The approach is based on Feynman’s continual in
tegrals method implemented in C++ programming language using NVIDIA CUDA t
echnology. Calculations were performed on the NVIDIA Tesla K40 accelerator
installed within the heterogeneous cluster of the Laboratory of Informati
on Technologies\, Joint Institute for Nuclear Research\, Dubna. A wide ran
ge of few-body bound systems has been considered including nuclei describe
d as consisting of protons and neutrons (e.g.\, 3\,4He)\, nuclei described
as consisting of clusters and nucleons (e.g.\, 6He)\, as well as quark sy
stems. The correctness of the results was checked by the comparison with t
he experimental data and the results obtained within other approaches. Par
allel implementation of Feynman’s continual integrals method significant
ly increases the speed of calculations\, which\, in certain cases\, enable
s calculations impossible before. In addition\, it allows one to reduce th
e mesh step in calculations of wave functions as well as obtain good stati
stics\, which increases the accuracy of calculations.\n\nhttps://indico.ji
nr.ru/event/137/contributions/604/
LOCATION: 406A
URL:https://indico.jinr.ru/event/137/contributions/604/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Reduction of network traffic to point images for the analysis of i
ts behavioral structure
DTSTART;VALUE=DATE-TIME:20170704T133000Z
DTEND;VALUE=DATE-TIME:20170704T134500Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-605@indico.jinr.ru
DESCRIPTION:Speakers: Dmitry Repin (State Institute of Information Technol
ogies and Telecommunications «Informika»)\nIn Cisco Guard XT technology
under the protection against DDoS attacks\, along with filtering and activ
e verification\, uses anomaly detection. In this case\, all traffic that i
s not stopped by the filtering and active verification modules is monitore
d\, and this traffic is matched against the basic behavior recorded for a
certain period of time.\nIn this paper\, we propose an approach based on t
he reduction of numerous parameters of network traffic into point images t
hat form the corresponding time trajectories in 3D and 2D spaces. Initial
parameters of the network traffic are obtained from the information genera
ted by the NetFlow protocol (Cisco). In the future\, the resulting traject
ories can be easily used both at the learning stage and at the stage of an
omalies recognizing of network traffic\, since it becomes possible both fo
r visual and automatic marking of 3D and 2D spaces to normal and abnormal
areas.\nExamples of visualization of network traffic are presented\, which
simplify the analysis of its behavioral structure.\n\nKeywords: network t
raffic\, DDoS-attack\, parameters\, reduction\, point images\, learning\,
recognition\, behavioral structure.\n\nРедукция сетевого
трафика в точечные образы для анализа ег
о поведенческой структуры \n\nБоков Д.Ю.\,
Краснов А.Е.\, Никольский Д.Н.\, Репин Д.С.\n\
nАннотация.\nВ технологии Cisco Guard XT при защ
ите от DDoS атак наряду с фильтрацией и акт
ивной верификацией используется распоз
навание аномалий. При этом выполняется м
ониторинг всего трафика\, который не был
остановлен модулями фильтрации и активн
ой верификации\, и этот трафик сопоставл
яется с базовым поведением\, зафиксирова
нным в течение определенного периода вр
емени. \nВ настоящей работе предлагается
подход\, основанный на редукции многочис
ленных параметров сетевого трафика в то
чечные образы\, формирующие соответству
ющие временные траектории в 3D и 2D простр
анствах. При этом исходные параметры сет
евого трафика получают из информации\, ф
ормируемой протоколом NetFlow (Cisco). В дальне
йшем получаемые траектории легко исполь
зовать как на стадии обучения\, так и на с
тадии распознавания аномалий сетевого т
рафика\, поскольку появляется возможнос
ть как визуальной\, так и автоматической
разметки 3D и 2D пространств на нормальные
и аномальные области.\nПриведены пример
ы образной визуализации сетевого трафик
а\, упрощающие анализ его поведенческой
структуры.\n\nКлючевые слова: сетевой тра
фик\, DDoS-атака\, параметры\, редукция\, точ
ечные образы\, обучение\, распознавание\,
поведенческая структура.\n\nhttps://indico.jinr.ru/e
vent/137/contributions/605/
LOCATION: 310
URL:https://indico.jinr.ru/event/137/contributions/605/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Generalized Techniques in Numerical Integration
DTSTART;VALUE=DATE-TIME:20170705T053000Z
DTEND;VALUE=DATE-TIME:20170705T060000Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-606@indico.jinr.ru
DESCRIPTION:Speakers: Hassan Safouhi (Campus Saint-Jean\, University of Al
berta 8406\, 91 Street\, Edmonton\, Alberta T6C 4G9\, Canada)\nIntegration
by parts is one of the most popular techniques in the analysis of integra
ls and it has frequently been used to create divergent series or asymptoti
c expansions of integral representations. The product of the technique is
usually a divergent series formed from evaluating boundary terms\; however
\, sometimes the remaining integral is also evaluated. Striking examples a
re the Euler series arising from integrating the Euler integral by parts a
nd examples arising in molecular structure calculations. \nIn this contrib
ution\, we explore a generalized and formalized integration by parts to cr
eate equivalent representations to some challenging integrals and we intro
duce a numerical algorithm\, called the staircase algorithm\, which is sho
wn to be robust and leads to an unprecedented accuracy.\nAs a demonstrativ
e archetype\, we examine the infinite-range Fresnel integrals\, the Twiste
d Tail\, Airy functions and Bessel integrals.\n\nhttps://indico.jinr.ru/ev
ent/137/contributions/606/
LOCATION: LIT Conference Hall
URL:https://indico.jinr.ru/event/137/contributions/606/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Wavelet-Based Numerical and Semianalytical Methods of Local Struct
ural Analysis in Engineering
DTSTART;VALUE=DATE-TIME:20170703T113000Z
DTEND;VALUE=DATE-TIME:20170703T114500Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-609@indico.jinr.ru
DESCRIPTION:Speakers: Marina Mozgaleva (National Research Moscow State Uni
versity of Civil Engineering)\, Pavel Akimov (Scientific Research Center
“StaDyO”)\nNumerical or semianalytical solution of problems of structu
ral mechanics with immense number of unknowns is time-consuming process. H
igh-accuracy solution at all points of the model is not required normally\
, it is necessary to find only the most accurate solution in some pre-know
n domains. The choice of these domains is a priori data with respect to th
e structure being modeled. Designers usually choose domains with the so-ca
lled edge effect (with the risk of significant stresses that could lead to
destruction of structures) and regions which are subject to specific oper
ational requirements. Stress-strain state in such domains is important. Wa
velets provide effective and popular tool for local structural analysis. \
nOperational and variational formulations of problems of structural mechan
ics with the use of method of extended domain are presented. After discret
ization and obtaining of governing equations\, problems are transformed to
a multilevel space by multilevel wavelet transform. Discrete wavelet basi
s is used and corresponding direct and inverse algorithms of transformatio
ns are performed. Due to special algorithms of averaging\, reduction of th
e problems is provided. Wavelet-based methods allows reducing the size of
the problems and obtaining accurate results in selected domains simultaneo
usly. These are rather efficient methods for evaluation of local phenomeno
n in structures.\n\nhttps://indico.jinr.ru/event/137/contributions/609/
LOCATION: LIT Conference Hall
URL:https://indico.jinr.ru/event/137/contributions/609/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The Disrete-Continual Finite Element Method in Engineering
DTSTART;VALUE=DATE-TIME:20170703T111500Z
DTEND;VALUE=DATE-TIME:20170703T113000Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-610@indico.jinr.ru
DESCRIPTION:Speakers: Oleg Negrozov (National Research Moscow State Univer
sity of Civil Engineering)\, Pavel Akimov (Scientific Research Center “S
taDyO”)\nDevelopment\, research and verification of correct mathematical
models and methods of structural mechanics are the most important aspects
of ensuring safety of structures and buildings. Finite element method (FE
M) is the most popular method of structural analysis. The field of applica
tion of discrete-continual finite element method (DCFEM) comprises structu
res with regular (in particular\, constant or piecewise constant) physical
and geometrical parameters in some dimension (“basic” direction). Con
sidering problems remain continual along “basic” direction while along
other directions finite element approximation is presupposed.\nAfter disc
retization within DCFEM we obtain resultant multipoint boundary problem fo
r system of ordinary differential equations with piecewise constant numeri
cal coefficients. Solution of such problems is accentuated by numerous fac
tors. They include boundary effects (stiff systems) and considerable numbe
r of differential equations. Moreover\, matrices of coefficients of a syst
em normally have eigenvalues of opposite signs and corresponding Jordan ma
trices are not diagonal. Special method of solution of such multipoint bou
ndary problems of structural analysis has been developed. Its major peculi
arities include universality\, computer-oriented algorithm\, computational
stability\, optimal conditionality of resultant systems and partial Jorda
n decomposition of matrix of coefficient\, eliminating necessity of calcul
ation of root vectors.\nCombinations of DCFEM and FEM are considered as we
ll.\n\nhttps://indico.jinr.ru/event/137/contributions/610/
LOCATION: LIT Conference Hall
URL:https://indico.jinr.ru/event/137/contributions/610/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Numerical Simulation of the Hydrated Electron States Formation
DTSTART;VALUE=DATE-TIME:20170703T133000Z
DTEND;VALUE=DATE-TIME:20170703T134500Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-611@indico.jinr.ru
DESCRIPTION:Speakers: Alina Volokhova (LIT JINR)\nA method and a complex o
f computer programs are developed for the numerical solution of the system
of nonlinear partial differential equations describing a formation of the
polaron states in condensed media [1\,2]. Parallel implementation is base
d on the MPI technique and on the utilizing of the partition algorithm [3]
.\n\nNumerical simulation of the photoexcited electron states formation in
water under the action of the ultraviolet range laser irradiation is carr
ied out. Our approach allows one to reproduce the experimental data on the
hydrated electrons formation [2\,4]. The model was modified to account fo
r the time-dependence of the absorption band width of the hydrated electro
n. This modification improves an agreement of numerical results with exper
imental data.\n\nThe work was supported by the RFBR (grant 17-01-00661a)\n
\n[1] V. D. Lakhno Chem. Phys. Lett. 437 P.198-202 (2007)\n[2] V.D. Lakhno
\, A.V. Volokhova\, E.V. Zemlyanaya\, et al Journal of Surface Investigati
on: X-ray\, Synchrotron and Neutron Techniques 9 (1)\, 7580 (2015)\n\n[3]
A.V. Volokhova\, E.V. Zemlyanaya\, V.S. Rikhvitskij Computational Methods
and Programming (Russian) 16\, 281-289 (2015)\n\n[4] E.V. Zemlyanaya\, A
.V. Volokhova\, V.D. Lakhno\, I.V. Amirkhanov\, I.V. Puzynin\, T.P. Puzyni
na\, V.S. Rikhvitskiy\, P.Kh. Atanasova AIP Conference Proceedings\, Vol.
1684\, 100006(1-9)\, 2015\n\nhttps://indico.jinr.ru/event/137/contribution
s/611/
LOCATION: 406A
URL:https://indico.jinr.ru/event/137/contributions/611/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Contemporary Problems of Numerical Modeling of Unique Structures\,
Buildings and Complexes
DTSTART;VALUE=DATE-TIME:20170703T103000Z
DTEND;VALUE=DATE-TIME:20170703T110000Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-612@indico.jinr.ru
DESCRIPTION:Speakers: Alexander Belostotsky (Scientific Research Center
“StaDyO”)\nThe following contemporary problems of mathematical modelli
ng of unique structures\, buildings and complexes are under consideration:
modeling of interaction of buildings and structures with a foundation wit
h allowance for real properties\, stage-by-stage construction and actual o
peration history\; structural analysis with allowance for physical\, geome
trical and other nonlinearities\; structural analysis with allowance for s
tructural and technological specificity of buildings and facilities\; nume
rical modeling of wind flows and loads\, experimental validations of wind
load analysis\; seismic analysis\; progressive collapse analysis of buildi
ngs and facilities with allowance for real dynamic highly nonlinear effect
s of elastoviscoplasticity and large displacements\; development and refin
ement of methods and algorithms for solution of large-scale computational
problems\; development of calibratable predictive mathematical and compute
r models as part of structural health monitoring systems at the stages of
erection and operation of buildings and facilities\; application of algori
thms of aerodynamics for modelling of snow sedimentations\, explosion load
s and distribution of hazardous emissions\; numerical modeling of three-di
mensional nonstationary roblems of fire resistance\; solution of coupled p
roblems of aerohydroelasticity. Development of proprietary software and ve
rification of software in the Russian Academy of Architecture and Building
Sciences are considered as well.\n\nhttps://indico.jinr.ru/event/137/cont
ributions/612/
LOCATION: LIT Conference Hall
URL:https://indico.jinr.ru/event/137/contributions/612/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Machine-learning algorithms for classification and separation of n
oisy signals
DTSTART;VALUE=DATE-TIME:20170706T110000Z
DTEND;VALUE=DATE-TIME:20170706T111500Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-613@indico.jinr.ru
DESCRIPTION:Speakers: Yurii Butenko (JINR)\nThe main goal of this paper is
to investigate the applicability of machine learning methods for processi
ng and classifying experimental data obtained from the DEMON detector\, as
well as a comparative analysis of their effectiveness.\nDetectors of the
DEMON type are one of the basic measuring elements in the ATLAS and ALICE
experiments and are usually used for detecting neutrons and gamma quanta.\
n The standard software package for this detector allows you to convert al
l events into energy diagrams that are recorded and saved for later statis
tical and mathematical analysis. The main problem of statistical processin
g of the obtained data is the separation and identification of events corr
esponding to neutrons and gamma / quanta. The double integration method us
ed to solve it in the framework of standard software does not allow us to
clearly identify and separate these events at certain energy intervals.\n
This fact motivated us to apply modern methods of machine learning to this
problem.\n\nhttps://indico.jinr.ru/event/137/contributions/613/
LOCATION: 406B
URL:https://indico.jinr.ru/event/137/contributions/613/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Intel® Data Analytics Acceleration Library – modern solution fo
r Big Data\, neural networks and Machine learning
DTSTART;VALUE=DATE-TIME:20170706T130000Z
DTEND;VALUE=DATE-TIME:20170706T131500Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-614@indico.jinr.ru
DESCRIPTION:Speakers: G. Fedorov (Intel)\nhttps://indico.jinr.ru/event/137
/contributions/614/
LOCATION:
URL:https://indico.jinr.ru/event/137/contributions/614/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Computational methods in relativistic atomic physics
DTSTART;VALUE=DATE-TIME:20170704T134500Z
DTEND;VALUE=DATE-TIME:20170704T141500Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-615@indico.jinr.ru
DESCRIPTION:Speakers: Andrey SURZHYKOV (Physikalisch-Technische Bundesanst
alt\, Braunschweig\, Germany)\nOwing to recent advances in accelerator and
storage ring techniques\, more possibilities arise to study formation of
quasi-molecules in slow heavy-ion collisions. Today\, these (quasi) molecu
les are believed to be a versatile tool for investigating a number of fund
amental problems in modern physics. In particular\, analysis of molecular
spectra can provide unique knowledge on the relativistic\, many-body and q
uantum electrodynamics (QED) effects in the non-perturbative domain of hig
h nuclear charges and super strong electromagnetic fields. Moreover\, the
electron-positron pair production that occurs under such extreme condition
s might be utilized to explore the properties and behaviour of physical va
cuum and\, even\, to search for new particles.\nTheoretical description of
super-heavy quasi-molecules is a complicated task which requires solution
of the two-center Dirac equation. During the recent years\, we have devel
oped several methods for dealing with such a two-center problem. The meth
ods utilize finite basis sets constructed from B-splines and provide an ef
ficient access to a complete (quasi-) molecular spectrum\, including not o
nly bound states but also positive- as well as negative-continuum solution
s. In my contribution\, I will review these novel computational approaches
and will show their application for the analysis of the structure and dyn
amics of quasi-molecules.\n\nhttps://indico.jinr.ru/event/137/contribution
s/615/
LOCATION: 406A
URL:https://indico.jinr.ru/event/137/contributions/615/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Turbulent mixing of a critical fluid: the exact renormalization
DTSTART;VALUE=DATE-TIME:20170703T134500Z
DTEND;VALUE=DATE-TIME:20170703T140000Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-616@indico.jinr.ru
DESCRIPTION:Speakers: Michal Hnatič (Department of Theoretical Physics an
d Astrophysics\, Faculty of Science\, P.J. Safarik University\, Bogoliubo
v Laboratory of Theoretical Physics\, Joint Institute for Nuclear Researc
h)\nNon- perturbative Renormalization Group ( NPRG ) technique is applied
to a stochastical model of non-conserved scalar order parameter near
its critical point\, subject to turbulent advection .\nThe compressible a
dvecting flow is modelled by a random Gaussian velocity field with zero m
ean and correlation function $\\langle \\upsilon_j \\\, \\upsilon_i \\ra
ngle \\sim\n(P_{j i}^{\\perp} + \\alpha P_{j i}^{\\parallel})/k^{d+\\zeta}
$. Depending on the relations between the parameters $ \\zeta\, \\alpha$
and the space dimensionality $d$\, the model reveals several types of sca
ling regimes. Some of them are well known (model $A$ of equilibrium crit
ical dynamics and\nlinear passive scalar field advected by a random turbul
ent flow)\, but there is a new nonequilibrium regime (universality class)
associated with new nontrivial fixed points of the renormalization group
equations. We have obtained the phase diagram ($d\, \\zeta$) of possible
scaling regimes in system. The physical point $d=3\,\n\\zeta=4/3$ corres
ponding to three-dimensional fully developed Kolmogorov's turbulence wher
e critical fluctuations are irrelevant\, is stable for $\\alpha \\lesssim
2.26$. Otherwise\, in the case of ``strong compressibility'' $\\alpha \\
gtrsim 2.26$\, the critical fluctuations of the order parameter become\nr
elevant for tree-dimensional turbulence. Estimations of critical exponen
ts for each scaling regimes are presented.\n\nhttps://indico.jinr.ru/event
/137/contributions/616/
LOCATION: 310
URL:https://indico.jinr.ru/event/137/contributions/616/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Time discretization impact on the target localization precision u
sing UWB radar
DTSTART;VALUE=DATE-TIME:20170706T131500Z
DTEND;VALUE=DATE-TIME:20170706T133000Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-617@indico.jinr.ru
DESCRIPTION:Speakers: Ján Buša (Department of Mathematics and Theoretica
l Informatics\, FEEI Technical University in Košice\, Nemcovej 32\, 040 0
1 Košice\, Slovakia)\nUWB radar technology enables a target localization
of an object\, \ne.g.\, man behind a wall of known material consistency\,
e.g.\, concrete. \nIf exact values of TOA (Time of a signal arrival from a
transmitting antenna to a receiver) \nare known\, it is possible to achie
ve high precision of localization.\nIn the paper an influence of a time qu
antization on the localization \nprecision will be studied and discussed.\
n\nhttps://indico.jinr.ru/event/137/contributions/617/
LOCATION:
URL:https://indico.jinr.ru/event/137/contributions/617/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Radiactivity registered with a small number of events
DTSTART;VALUE=DATE-TIME:20170707T133000Z
DTEND;VALUE=DATE-TIME:20170707T134500Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-618@indico.jinr.ru
DESCRIPTION:Speakers: Victor Zlokazov (JINR\, LIT)\nA significant amount o
f the human knowledge of Nature is based on the \nevidence which the
rigorous mathematics would have called insufficient. \nHowever\, in som
e cases (very important ones indeed) the increasing of data \nstatistics i
s hardly implementable\, added to which \nonce suc
h problem has been overcome in one field of the research \ninves
tigations there appear another ones with the same problem. \nRa
dioactivity is a very proliferic source of the information about the \
natomic and subatomic world\, but in some cases it is just an example of
\nthe above situation\, e.g.\, experiments on the synthesis of superhea
vy \nelements\, the outcome of which is always small.
\nThe report discusses the different aspects of the data analy
sis under \nunfavorable conditions : low statistics\, incomplete obse
rvation data etc. \nand their impact on the the parameter estimation and
the hypothesis \ntesting which in case of the exponential distribut
ion are very unfavorable \nto the low statistics\, since here its most pro
bable event is very far from \nthe expected one.
\nA special attention is given to criteria
for an optimum test by its \ndifferent merits: minimal confidence
interval length\, maximum covering \nprobability\, the most "natural"
interpretation\, etc.\n\nhttps://indico.jinr.ru/event/137/contributions/61
8/
LOCATION: LIT Conference Hall
URL:https://indico.jinr.ru/event/137/contributions/618/
END:VEVENT
BEGIN:VEVENT
SUMMARY:New HybriLIT cluster module devoted to graphical applications
DTSTART;VALUE=DATE-TIME:20170704T124500Z
DTEND;VALUE=DATE-TIME:20170704T130000Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-619@indico.jinr.ru
DESCRIPTION:Speakers: Mikhail Matveyev (JINR)\nThe heterogeneous cluster H
ybriLIT [1] enables high performance computing (HPC) in JINR by means of a
modular architecture involving multi-core processors\, coprocessors and g
raphical accelerators. A lately acquired HybriLIT module – the virtual d
esktop infrastructure (VDI) – secures the coverage of another vital need
\, the resource intensive graphical applications.\nThe VDI implementation
merges both cloud services and HPC resources within two kinds of virtual d
esktop solutions. The QUVE/KVM [2] based solution answers the cases when n
o dedicated GPU resources are requested. The XenServer [3] with Citrix Xen
software [3] enables the use of high performance GPU resources as well.\n
The present paper provides technical details of the VDI implementation. Ty
pical scenarios enabling remote access to the graphic applications are des
cribed. They allow the SaaS (software as a service) use of HPC resources b
y the end users.\n\n\nReferences\n1. Heterogeneous cluster HybriLIT of
LIT JINR. URL: http://hybrilit.jinr.ru/en/\n2. Hypervisor QEMU/KVM. URL
: http://linux-kvm.org\n3. Hypervisor XenServer. URL: http://xenserver.
org\, http://citrix.com\n\nhttps://indico.jinr.ru/event/137/contributions/
619/
LOCATION: 406B
URL:https://indico.jinr.ru/event/137/contributions/619/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Modeling turbulence via numerical functional integration
DTSTART;VALUE=DATE-TIME:20170706T111500Z
DTEND;VALUE=DATE-TIME:20170706T113000Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-620@indico.jinr.ru
DESCRIPTION:Speakers: Ilja Honkonen (Finnish Meteorlogical Institute)\nWe
investigate the possibility of modeling turbulence via numerical function
al integration. By transforming the incompressible stochastic Navier-Stok
es equation into a functional integral we are able to calculate equal-time
spatial correlation of system variables using standard methods of multid
imensional integration. In contrast to direct numerical simulation\, our
method allows for simple parallelization of the problem as the value of t
he integral at any point is independent of other points. Thus the entire
problem does not have to fit into available memory of any one computer but
can be distributed even onto several supercomputers and the cloud.\n\nWe
present the mathematical background of our method and its numerical implem
entation. The implementation is composed of a fast serial program for eval
uating the integral over a given volume and a Python wrapper that divides
the problem into subvolumes and distributes the work among available proce
sses. We use various existing programs/libraries written mostly in C/C++ f
or integrating subvolumes. We show preliminary results obtained with our m
ethod and discuss its pros\, cons and future developments.\n\nhttps://indi
co.jinr.ru/event/137/contributions/620/
LOCATION: 406A
URL:https://indico.jinr.ru/event/137/contributions/620/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Quasicrossings of the energy terms in the two-Coulomb-centre probl
em
DTSTART;VALUE=DATE-TIME:20170703T113000Z
DTEND;VALUE=DATE-TIME:20170703T114500Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-621@indico.jinr.ru
DESCRIPTION:Speakers: Michal HNATIČ (Institute of Physics\, Pavol Jozef S
afarik University\, Kosice\, Slovak Republic\; Bogoliubov Laboratory of T
heoretical Physics\, Joint Institute for Nuclear Research)\nThe first thre
e corrections to the bound state energy\, separation constants\, and wave
functions of hydrogen-like ion in the field of remote ($R \\gg 1$) point
charge are calculated by means of the modified perturbation theory. The c
onsistent scheme for obtaining WKB expansions for solutions of the quasia
ngular equation in quantum mechanical two-Coulomb-centre problem $Z_1eZ_2
$ is developed. In the framework of this scheme\, the quasiclassical angu
lar Coulomb spheroidal wavefunctions for large distances between the fixe
d positive charges (nuclei) are constructed for the below-barrier motion
of the negative particle (electron). The quasiclassical expression for t
he exchange interaction $\\Delta E$ of potential curves at the points of
their quasicrossing is found. It can be used further for the calculation
of cross sections of charge exchange processes between hydrogen or hydrog
en-like atoms and bare nuclei.\n\nhttps://indico.jinr.ru/event/137/contrib
utions/621/
LOCATION: 310
URL:https://indico.jinr.ru/event/137/contributions/621/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Creating Development environment and based on it versions of the c
omputer algebra systems AXIOM\, REDUCE and MAXIMA
DTSTART;VALUE=DATE-TIME:20170707T131500Z
DTEND;VALUE=DATE-TIME:20170707T133000Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-622@indico.jinr.ru
DESCRIPTION:Speakers: A. Raportirenko (JINR)\nIt is created the minimal de
velopment environment for computer algebra systems\nAXIOM\, REDUCE and MAX
IMA\, which includes compilers from С and FORTRAN\, standard\nlibraries l
ibc\, libm\, ...\, utilities lex\, yacc\, awk\, ...\, and COMMON LISP\nint
erpreter\, which is complete and closed.\n\nIt is based on sources of libr
aries and compilers of the middle of 90-th\,\navailable in internet and be
longing to classical software.\nMainly it is from System V Release 4 sourc
es of the UNIX System Laboratories\,\nand COMMON LISP interpreter from Luc
id.\n\nThis\, from one side\, allows again to provide numerical computatio
ns from\nsymbolic session\, dynamically loading needed object files.\n\nFr
om another side\, it is possible to works with the same environment in\ndi
fferent operating systems.\n\nAt present it is worked under Linux.\n\nhttp
s://indico.jinr.ru/event/137/contributions/622/
LOCATION:
URL:https://indico.jinr.ru/event/137/contributions/622/
END:VEVENT
BEGIN:VEVENT
SUMMARY:New methods of detection in Computer Vision
DTSTART;VALUE=DATE-TIME:20170704T134500Z
DTEND;VALUE=DATE-TIME:20170704T140000Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-623@indico.jinr.ru
DESCRIPTION:Speakers: Alexey Stadnik (Videointellect\, Dubna\, Russia)\nTh
e construction of event detectors is still a relevant task\, due to dynam
ic developments in the field of computer vision. We present the new appro
aches which we developed to achieve superior\ndetection perfomance for rea
listic tasks\, such as detection of objects\, detection of motion and det
ection of behaviors. These are then successfully implemented in detector
s\, which can be integrated\nin real life projects - such as smart cities\
, security monitoring\, safe cities.\n\nhttps://indico.jinr.ru/event/137/
contributions/623/
LOCATION: 310
URL:https://indico.jinr.ru/event/137/contributions/623/
END:VEVENT
BEGIN:VEVENT
SUMMARY:ONLINE EVENT RECONSTRUCTION IN THE CBM EXPERIMENT AT FAIR
DTSTART;VALUE=DATE-TIME:20170707T070000Z
DTEND;VALUE=DATE-TIME:20170707T073000Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-624@indico.jinr.ru
DESCRIPTION:Speakers: Ivan (for the CBM collaboration) Kisel (Goethe Unive
rsity Frankfurt\, Frankfurt am Main\, Hesse\, Germany\, Frankfurt Institu
te for Advanced Studies\, Frankfurt am Main\, Hesse\, Germany GSI Helmholt
z Centre for Heavy Ion Research\, Darmstadt\, Germany)\, Valentina Akishin
a (GSI)\nOne of the main purposes of the physics program of the future hea
vy-ion experiment CBM (FAIR\, Germany) is to understand the properties of
strongly interacting matter at very high baryonic densities and to study t
he possibility of a phase transition to a deconfined and chirally restored
phase of quark matter. The experiment will operate at high interaction ra
tes up to 10 MHz\, that requires a full event reconstruction in real time.
\nIn order to make an efficient event selection online a clean sample of p
articles has to be provided by the reconstruction package called First Lev
el Event Selection (FLES). The FLES package operates in two stages. First\
, particles registered in the CBM detector system are reconstructed. Then
short-lived particles decayed before or inside the setup are searched base
d on their charged and neutral daughter particles. Since the FLES package
is developed to run on many-core computer architectures\, the reconstructi
on of particles is done in parallel that provides a possibility for a glob
al competition between particle candidates. Such a global event reconstruc
tion significantly improves suppression of a combinatorial background and
provides for further physics analysis a very clean sample of particles pro
duced at different stages of heavy-ion collision.\nThe event reconstructio
n procedure and the results of its application to simulated collisions in
the CBM detector setup are presented and discussed in details.\n\nhttps://
indico.jinr.ru/event/137/contributions/624/
LOCATION:
URL:https://indico.jinr.ru/event/137/contributions/624/
END:VEVENT
BEGIN:VEVENT
SUMMARY:HOLTER MONITORING DATA-BASED INSTANTANEOUS CARDIAC RHYTHM SPECTRUM
. RESONANCES AND ANTIRESONANCESX
DTSTART;VALUE=DATE-TIME:20170707T094500Z
DTEND;VALUE=DATE-TIME:20170707T100000Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-625@indico.jinr.ru
DESCRIPTION:Speakers: Victor Tsvetkov (Tver State University)\nThe report
contains the instantaneous cardiac rhythm (ICR) frequency (y) distribution
functions f(y) determined on the basis of the Holter monitoring data usin
g MAPLE programs. There was identified a multimodal behaviour of the distr
ibution function f(y). It was shown that the ICR spectrum consisted of a s
olid component\, resonances and antiresonances. The resonances are peaks f
(y) determined by peak height h and peak width Г. The antiresonances are
dips f(y) determined by peak dip depth h and width Г. The most of the tim
e an ICR is in resonance states\, and the rest of the time – in antireso
nance states.\n\nhttps://indico.jinr.ru/event/137/contributions/625/
LOCATION: 406A
URL:https://indico.jinr.ru/event/137/contributions/625/
END:VEVENT
BEGIN:VEVENT
SUMMARY:MODELING THE BEHAVIOR OF VIRTUAL SYSTEMS WITH ENDOGENOUSLY SHAPING
PURPOSES
DTSTART;VALUE=DATE-TIME:20170704T073000Z
DTEND;VALUE=DATE-TIME:20170704T080000Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-626@indico.jinr.ru
DESCRIPTION:Speakers: G. Vinogradov (Tver State University\, Tver\, Russia
)\nThe problem of constructing a choice model of an agent endogenously sha
ping purposes of his evolution is under debate. It is demonstrated that it
s solution requires the development of well-known methods of decision-maki
ng while taking into account the relation of action mode motivation to an
agent's ambition to implement subjectively understood interests and the en
vironment state. The latter is submitted for consideration as a purposeful
state situation model that exists only in the mind of an agent. It is the
situation that is a basis for getting an insight into the agent’s ideas
on the possible selected action mode results. The agent’s ambition to b
uild his confidence in the feasibility of the action mode and the possibil
ity of achieving the desired state requires him to use the procedures of f
orming a model-representation based on the measured values of the environm
ent state. This leads to the gaming approach for the choice problem and it
s solution can be obtained on a set of trade-off alternatives.\n\nhttps://
indico.jinr.ru/event/137/contributions/626/
LOCATION:
URL:https://indico.jinr.ru/event/137/contributions/626/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Global Alignment of BM@N Drift Chambers
DTSTART;VALUE=DATE-TIME:20170707T120000Z
DTEND;VALUE=DATE-TIME:20170707T121500Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-627@indico.jinr.ru
DESCRIPTION:Speakers: Ján Fedorišin (VB LHE\, JINR\, Dubna)\nVeksler and
Baldin Laboratory of High Energy Physics\,\n Joint Institute
for Nuclear Research\,\n 141980 Dubna\, Moscow region\, Russ
ia\n E-mail:fedorisin@jinr.ru\n\nDrift chambers (DCH's)
constitute an important part of the tracking system of the BM@N experiment
designed to study the production of baryonic matter at the Nuclotron ener
gies.\n The method [1\,2] of particle hit and track reconstruction in the
drift chambers has been already proposed and tested on the BM@N deuteron b
eam data.\n In this study the new approach to global alignment of DCH's is
introduced and applied in order to correct the systematic errors of exper
imental data caused by the detectors misalignment. The approach is based o
n the GEANT backward extrapolation of DCH reconstructed deuteron beam to a
position prior to being affected by the BM@N magnetic field. The differen
ce between the extrapolated and the assumed beam position is subsequently
used to globally align both the drift chambers.\n\n\nReferences\n\n[1] J.
Fedorišin\, EPJ Web of Conferences 108\, 02021 (2016)\n[2] J. Fedorišin\
, EPJ Web of Conferences 138\, 11005 (2017)\n\nhttps://indico.jinr.ru/even
t/137/contributions/627/
LOCATION: LIT Conference Hall
URL:https://indico.jinr.ru/event/137/contributions/627/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Application of artificial neural networks and singular-spectral an
alysis in forecasting the daily passenger’s traffic in the Moscow Metro
DTSTART;VALUE=DATE-TIME:20170704T131500Z
DTEND;VALUE=DATE-TIME:20170704T133000Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-628@indico.jinr.ru
DESCRIPTION:Speakers: Evgeny Osetrov (JINR / FTI “Rostransmodernizatsiya
)\, Victor Ivanov (JINR\, LIT)\nIn this paper\, we developed a methodology
for the medium-term prediction of daily volumes of passenger traffic in t
he Moscow Metro. It includes three variants of the forecast:\n1) on the ba
sis of artificial neural networks: a multilayer perceptron (MLP) was used\
, on the input of which a set of factors affecting the daily volume of pas
senger transportation was supplied\; 2) using the singular-spectral analys
is implemented in the package "Caterpillar"-SSA: in this case\, only the d
ata of the time series of daily passenger\ntraffic were analyzed\; 3) join
t use of the MLP and the "Caterpillar"-SSA approach: to the input of the n
eural network\, in addition to the above factors\, the forecast data compu
ted using the package "Caterpillar"-SSA were supplied. The developed metho
ds and algorithms allow one to conduct with an acceptable accuracy a mediu
m-term forecasting of the passenger traffic in the Moscow Metro.\n\nhttps:
//indico.jinr.ru/event/137/contributions/628/
LOCATION: 310
URL:https://indico.jinr.ru/event/137/contributions/628/
END:VEVENT
BEGIN:VEVENT
SUMMARY:APPLICATION OF HARMONIC OSCILLATOR BASIS WITH DIFFERENT SIZE PARAM
ETERS FOR CALCULATION OF GROUND STATE ENERGY OF COULOMB THREE-BODY SYSTEMS
DTSTART;VALUE=DATE-TIME:20170703T124500Z
DTEND;VALUE=DATE-TIME:20170703T130000Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-629@indico.jinr.ru
DESCRIPTION:Speakers: Algirdas Deveikis (Dr.\, Assoc. Prof.\, Department o
f Applied Informatics\, Vytautas Magnus University\, Vileikos 8\, LT-44404
\, Kaunas\, Lithuania)\nThe new harmonic oscillator (HO) expansion method
[1] is applied to calculate non-relativistic ground state energy of a numb
er of Coulomb three-particle systems with two identical particles for up t
o 28 excitation HO quanta. The novelty of the method is the introduction o
f different size parameters in the Jacobi coordinates instead of only one
unique oscillator length parameter in the traditional approach. It has bee
n found that variational calculations of the ground state energies of thes
e systems using the proposed basis with different size parameters converge
much faster than in the traditional treatment with only one oscillator le
ngth. Particularly\, for systems with molecular character the second nonli
near variational parameter is vital for reasonable convergence. The result
s obtained in basis with different sizes are compared with the ones calcul
ated in traditional basis with the same oscillator length for each Jacobi
coordinate and with those given in the literature [2].\n\nhttps://indico.j
inr.ru/event/137/contributions/629/
LOCATION: 406A
URL:https://indico.jinr.ru/event/137/contributions/629/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Astroparticle Data Life Cycle Initiative
DTSTART;VALUE=DATE-TIME:20170706T113000Z
DTEND;VALUE=DATE-TIME:20170706T114500Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-630@indico.jinr.ru
DESCRIPTION:Speakers: Alexander Kryukov (SINP MSU)\nNowadays the exponenti
al growth of the amount of experimental data can be observed. While there
was 1-10 Tb of data per year in astrophysics 10-15 years ago\, new experim
ental facilities generate data sets ranging in size from 100’s to 1000's
of terabytes per year.\n\nIt's obvious that various activities must be pe
rformed continually across all stages of the data life cycle to help suppo
rt effective\ndata management: the collection and storage of data\, its pr
ocessing and analysis\, refining the physical model\, making preparations
for publication\, and data reprocessing taking refinement into account. An
important topic for modern science in general and astroparticle physics i
n particular is open science\, the model of free\naccess to data. This app
roach is especially important in the age of Big Data\, when a complete ana
lysis of the experimental data cannot be performed within one collaboratio
n.\n\nThe present project will strive to develop an open science system to
be able to collect\, store\, and analyze astrophysical data having the TA
IGA and KASCADE experiments as the examples.\n\nThis is an innovative appr
oach that will be used in astroparticle physics research for the first tim
e. Plans are underway to expand the number of experiments by exporting dat
a from other scientific collaborations\, it will rapidly advance the resea
rch of fundamental properties of matter and the universe.\n\nhttps://indic
o.jinr.ru/event/137/contributions/630/
LOCATION: 406B
URL:https://indico.jinr.ru/event/137/contributions/630/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Finite size effects in the thermodynamics of a free neutral scalar
field on the lattice and in the continuum
DTSTART;VALUE=DATE-TIME:20170703T114500Z
DTEND;VALUE=DATE-TIME:20170703T120000Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-631@indico.jinr.ru
DESCRIPTION:Speakers: Alexandru Parvan (IFIN-HH and JINR)\nThe exact analy
tical lattice results for the partition function of the free neutral scala
r field in one spatial dimension in both the configuration and the momentu
m space were obtained in the framework of the path integral method. The sy
mmetric square matrices of the bilinear forms on the vector space of field
s in both configuration space and momentum space were found explicitly. Th
e exact lattice results for the partition function were generalized to the
three-dimensional spatial momentum space and the main thermodynamic quant
ities were derived both on the lattice and in the continuum limit. The the
rmodynamic properties and the finite volume corrections to the thermodynam
ic quantities of the free real scalar field were studied.\n\nhttps://indic
o.jinr.ru/event/137/contributions/631/
LOCATION: 310
URL:https://indico.jinr.ru/event/137/contributions/631/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Closing
DTSTART;VALUE=DATE-TIME:20170707T140000Z
DTEND;VALUE=DATE-TIME:20170707T143000Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-632@indico.jinr.ru
DESCRIPTION:https://indico.jinr.ru/event/137/contributions/632/
LOCATION: LIT Conference Hall
URL:https://indico.jinr.ru/event/137/contributions/632/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The mass-to-charge ratio of self-gravitating scalar field configur
ations
DTSTART;VALUE=DATE-TIME:20170707T103000Z
DTEND;VALUE=DATE-TIME:20170707T104500Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-633@indico.jinr.ru
DESCRIPTION:Speakers: Julia Chemarina ()\nhttps://indico.jinr.ru/event/137
/contributions/633/
LOCATION: 406A
URL:https://indico.jinr.ru/event/137/contributions/633/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Short-range interaction impact on two dimensional dipolar scatteri
ng
DTSTART;VALUE=DATE-TIME:20170703T140000Z
DTEND;VALUE=DATE-TIME:20170703T143000Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-634@indico.jinr.ru
DESCRIPTION:Speakers: Eu. Koval (JINR)\nhttps://indico.jinr.ru/event/137/c
ontributions/634/
LOCATION:
URL:https://indico.jinr.ru/event/137/contributions/634/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Radiation damage to nervous system: designing of optimal models fo
r realistic neuron morphology
DTSTART;VALUE=DATE-TIME:20170704T103000Z
DTEND;VALUE=DATE-TIME:20170704T104500Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-635@indico.jinr.ru
DESCRIPTION:Speakers: Batmunkh Munkhbaatar (LRB\, JINR)\nA quantitative st
udy of early mechanisms of the central nervous system (CNS) disorders indu
ced by high-energy heavy ions at the molecular and cellular levels is one
of urgent problem of modern radiobiology. The present study is focused on
the development of optimal models of neuronal morphology for Monte Carlo m
icrodosimetry simulation of initial radiation-induced events of heavy char
ged particles in the specific types of cells of hippocampus\, which is mos
t radiation-sensitive CNS structure. The applied simulation technique is b
ased on the Geant4-DNA toolkit. The calculations were made for beams of he
avy ions with doses corresponding to real fluxes of galactic cosmic rays.
Simple compartmental model and complex model with realistic morphology ext
racted from experimental data were constructed and compared. We estimated
distribution of energy deposition events and production of reactive chemic
al species within developed models of CA3\, CA1 pyramidal neurons\, DG gra
nule cells and interneurons of hippocampus. Similar distributions of energ
y deposition events were obtained in both simplified and realistic neuron
models. The results demonstrate that neuron morphology is an important fac
tor determining the accumulation of microscopic radiation dose and water r
adiolysis products in neurons.\n\nhttps://indico.jinr.ru/event/137/contrib
utions/635/
LOCATION: LIT Conference Hall
URL:https://indico.jinr.ru/event/137/contributions/635/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Prediction of Oscillations of the Thermodynamic Parameters of the
Cooling System of the IBR-2M Reactor Using Neural Nets
DTSTART;VALUE=DATE-TIME:20170703T140000Z
DTEND;VALUE=DATE-TIME:20170703T143000Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-636@indico.jinr.ru
DESCRIPTION:Speakers: Tsogtsaikhan Tsolmon (FLNP JINR)\nThe problem of pre
dicting the oscillations of the main thermodynamic parameters of the core
in the first loop of the sodium cooling system of IBR-2M reactor is examin
ed. Attention is focused mainly on the prediction of the temperature and s
odium flow at the entry into the core as well as the thermal power. It is
shown that the prediction makes it possible to reduce by a factor of 3 the
influence of slow oscillations of reactivity on the power and thereby red
uce the operational requirements for the automatic power stabilization sys
tem. Neural-net prediction using nonlinear autoregression nets with feedba
ck is proposed. The results agree with experiment to within ~5%.\n\nhttps:
//indico.jinr.ru/event/137/contributions/636/
LOCATION:
URL:https://indico.jinr.ru/event/137/contributions/636/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Spectral photosensitization of optical anisotropy in poly(vinyl ci
nnamate) solid films
DTSTART;VALUE=DATE-TIME:20170703T140000Z
DTEND;VALUE=DATE-TIME:20170703T143000Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-638@indico.jinr.ru
DESCRIPTION:Speakers: Denis Chausov (MRSU)\nWe observed possibilities and
properties of sensitized photo induced optical anisotropy formation in amo
rphous poly (vynyl-cinnamate) films (PVCi) and its derivant poly (vynyl-4-
methoxy-cinnamate) (PVMCi) under polarized light\, including the one which
is not absorbed by the supermolecules of the polymeric material. The effe
ct of the induced optical anisotropy involves transferring the energy of e
lectronic excitation from the donor molecules (Michler's ketone or 2-benzo
yl-methylene-3\, methyl-β-naphthosol) to the scavenger's molecules - PVCi
or PVMCi) and photo-topochemical ring formation of cinnamate units in pol
ymeric supermolecules. The discovered photo-induced anisotropy in solid PV
Ci and PVMCi films provides sensitized photo orientation of low-molecular
thermotropic liquid crystals.\n\nhttps://indico.jinr.ru/event/137/contribu
tions/638/
LOCATION:
URL:https://indico.jinr.ru/event/137/contributions/638/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Numerical algorithm for optimization of positive electrode in lead
-acid batteries
DTSTART;VALUE=DATE-TIME:20170706T103000Z
DTEND;VALUE=DATE-TIME:20170706T104500Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-639@indico.jinr.ru
DESCRIPTION:Speakers: Ancuta Teodora Murariu (INCDTIM)\nThe positive elect
rode in lead-acid batteries is one of the most sensitive parts of the batt
ery\, that is affected by aggressive chemical processes during its life. T
herefore\, an optimal design of the positive electrode of the battery may
have as effect a dramatic improvement of the properties of the battery - s
uch as total capacity or endurance during its life. Numerical optimization
of electrodes covers a range of rather complex tasks\, from the analysis
of the graphical representation of the current distribution to numerical s
olution of differential equations. We integrate all these in a software p
ackage that can be used for the development of optimized electrodes. We pr
esent the principles of our analysis as well as several guiding rules to b
e used for the electrode's design.\n\nhttps://indico.jinr.ru/event/137/con
tributions/639/
LOCATION: 310
URL:https://indico.jinr.ru/event/137/contributions/639/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Advanced computing in radiation biophysics
DTSTART;VALUE=DATE-TIME:20170704T063000Z
DTEND;VALUE=DATE-TIME:20170704T070000Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-640@indico.jinr.ru
DESCRIPTION:Speakers: Oleg Belov (LRB JINR)\nhttps://indico.jinr.ru/event/
137/contributions/640/
LOCATION: LIT Conference Hall
URL:https://indico.jinr.ru/event/137/contributions/640/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Approximate formulae for evaluation of expectations of random func
tionals based on chaotic development with respect to multiple Ito integral
s
DTSTART;VALUE=DATE-TIME:20170703T104500Z
DTEND;VALUE=DATE-TIME:20170703T110000Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-644@indico.jinr.ru
DESCRIPTION:Speakers: Alexandr Egorov (Institute of Mathematics National A
cademy of Sciences of Belarus)\nThe report is devoted to numerical evaluat
ion of mathematical expectations of functionals defined on trajectories of
stochastic processes. Our approach is to use quadrature formulas exact fo
r functional polynomials of the trajectories of the process\, as it was co
nsidered in [1\,2]. Construction of this type of formulas is strongly depe
ndent on way of giving the stochastic process. In [1\,2] the quadrature fo
rmulas are built in the cases where the characteristic functional of the p
rocess is known in explicit form. Some results are received in the cases w
here the process is the solution of Ito stochastic differential equation [
1-3]. Application of chaotic expansions of one class of functionals define
d on the trajectories of Gaussian processes with respect to functional Her
mite polynomials is considered in [4]. In this report we use chaos expansi
on with respect to multiple Ito integrals to construct quadrature formulae
for calculating of nonlinear functionals of one class of stochastic Levy
process containing continuous and discontinuous components. The formula is
exact for symmetric functional polynomial of third degree\, so we use in
the construction the product formula of multiple Levy-Ito integrals [5].\n
\nThis work is supported by Belarusian Republican Foundation for Fundament
al Research (project F16D-002).\n\nReferences\n\n[1] Egorov A.D.\, Sobolev
sky P.I. and Yanovich L.A. Functional Integrals: Approximate Evaluation an
d Applications. Kluwer Academic Publishers\, 1993\, 418 pp.\n\n[2] Egorov
A.D\, Zhidkov E.P.\, Lobanov Yu.Yu. Introduction to the theory and applica
tions of functional integrations. Fizmatlit\, Moskva\, 2006\, 400 pp. (in
Russian).\n\n[3] A.D. Egorov\, K. Sabelfeld. Monte Carlo Methods and Appli
cations\, Vol.18\, pp. 95-127.\n\n[4] Ayrjan E.A.\, Egorov A.D.\, Sevastya
nov L.A. On one approach to evaluation of mathematical expectations of ran
dom functionals\, Izvestiya NAN Belarusi. Series of Phys.-Math. Sci. 2014.
No. 2. pp. 21-26. (in Russian).\n\n[5] Yuh-Jia Lee\, Hsin-Hung Shih. The
product formula of multiple Levi-Ito integrals\, Bulletin of the Institute
of Mathematics Academia Sinica. V.32\, No. 2 (2004). pp. 71-95.\n\nhttps:
//indico.jinr.ru/event/137/contributions/644/
LOCATION: 310
URL:https://indico.jinr.ru/event/137/contributions/644/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Generating functions method for constructing new iterations
DTSTART;VALUE=DATE-TIME:20170703T140000Z
DTEND;VALUE=DATE-TIME:20170703T143000Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-645@indico.jinr.ru
DESCRIPTION:Speakers: Zhanlav Tugal (Institute of Mathematics\, National U
niversity of Mongolia)\nIn this paper we propose a generating function's m
ethod for constructing new two and three-point iterations with $p\\ (3\\le
q p\\leq8)$ order of convergence. This approach allows us to derive a new
family of optimal order iterative methods that includes well known methods
as a special cases. The necessary and sufficient conditions for $p$-th or
der convergence of proposed iterations are given in term of parameters $\\
tau_n$ and $\\alpha_n$. Several numerical results are given to demonstrate
the efficiency and performance of the presented methods and compare them
with some other existing methods.\n\nhttps://indico.jinr.ru/event/137/cont
ributions/645/
LOCATION:
URL:https://indico.jinr.ru/event/137/contributions/645/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Disentangling complexity in Bayesian automatic adaptive quadrature
DTSTART;VALUE=DATE-TIME:20170705T060000Z
DTEND;VALUE=DATE-TIME:20170705T063000Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-646@indico.jinr.ru
DESCRIPTION:Speakers: Gheorghe Adam (LIT-JINR and IFIN-HH\, Bucharest\, Ro
mania)\nThe present report discusses a Bayesian automatic adaptive quadrat
ure (BAAQ) solution for numerical integration which is simultaneously robu
st\, reliable\, and efficient\, hence able to yield guaranteed output in n
umerical experiments involving sudden unexpected modifications of the beha
vior of the integrand function.\nAn essential ingredient of the solution i
s the multiscale approach [1]. Within it\, for integration ranges of macro
scopic length\, which are of primary practical interest\, an early decisio
n path for the integrand profile (IP) scrutiny is defined which enables fa
st solution of four basic problems: (i) identification of simple integrals
\; (ii) check of the need to relax the user requested accuracy parameters\
; (iii) end of computation diagnostic for simple integrals\; (iv) hints on
manifestly ill-conditioning IP features.\nFor integrals which are neither
trivial\, nor manifestly ill-conditioned\, the Clenshaw-Curtis quadrature
is activated within the approach discussed in [2]. This enables further i
dentification of unresolved ill-conditioning features. We are thus left ei
ther with a hopefully well-conditioned integral\, for which the standard a
utomatic adaptive quadrature [3] is expected to yield reliable output\, or
with a manifestly ill-conditioned problem for which an improved version o
f the full BAAQ machinery [4] is activated.\n\nReferences\n[1] Gh. Adam\,
S. Adam\, “Length Scales in Bayesian Automatic Adaptive Quadrature”\,
in EPJ Web of Conferences\, vol. 108\, 2016\, 02002\, 1-6\; DOI: 10.1051/e
pjconf/201610802002. \n[2] S. Adam\, Gh. Adam\, “Summation Paths in Clen
shaw-Curtis Quadrature”\, in EPJ Web of Conferences\, vol. 108\, 2016\,
02003\, 1-6\; DOI: 10.1051/epjconf/201610802003.\n[3] A.R. Krommer and C.W
. Ueberhuber\, Computational Integration SIAM\, Philadelphia\, 1998.\n[4]
Gh. Adam and S. Adam\, in Mathematical Modeling and Computational Science
(MMCP2011)\, Gh. Adam\, J. Buša\, and M. Hnatič (Eds.)\, Springer\, Heid
elberg\, LNCS 7125\, (2012) pp.1–16.\n\nhttps://indico.jinr.ru/event/137
/contributions/646/
LOCATION: LIT Conference Hall
URL:https://indico.jinr.ru/event/137/contributions/646/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Dynamics of quantum correlations in bipartite Gaussian open quantu
m systems
DTSTART;VALUE=DATE-TIME:20170706T050000Z
DTEND;VALUE=DATE-TIME:20170706T053000Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-647@indico.jinr.ru
DESCRIPTION:Speakers: Aurelian Isar (National Institute of Physics and Nuc
lear Engineering\, Bucharest-Magurele\, Romania)\nIn the framework of the
theory of open systems based on completely positive quantum dynamical semi
groups\, we make a comparison of the behaviour of continuous variable quan
tum correlations (quantum entanglement\, entropic quantum discord\, geomet
ric quantum discord\, quantum steering) for a system consisting of: 1) two
non-coupled\; 2) two coupled bosonic modes embedded in a common environme
nt of the form of a thermal bath or of a squeezed thermal bath. We solve t
he Markovian master equation for the time evolution of the considered syst
em and describe the quantum correlations in terms of the covariance matrix
for Gaussian input states. Depending on the values of the parameters char
acterizing the initial state of the system (squeezing parameter\, average
photon numbers)\, the coefficients describing the interaction of the syste
m with the reservoir (temperature\, dissipation constant)\, and on the int
ensity of the interaction between the two modes\, one may notice phenomena
like generation of quantum correlations\, their suppression (sudden death
)\, periodic revivals and suppressions\, or an asymptotic decay in time of
quantum correlations.\n\nhttps://indico.jinr.ru/event/137/contributions/6
47/
LOCATION: LIT Conference Hall
URL:https://indico.jinr.ru/event/137/contributions/647/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Hidden attractors in bubble contrast agent model
DTSTART;VALUE=DATE-TIME:20170706T114500Z
DTEND;VALUE=DATE-TIME:20170706T120000Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-648@indico.jinr.ru
DESCRIPTION:Speakers: Ivan Garashchuk (National Research Nuclear Universit
y MEPhI\, Moscow\, Russia)\nIn this work we studied a model\, describing d
ynamics of a spherical gas bubble in a fluid. The bubble is oscillating cl
ose to the wall of finite thickness under the influence of external field
pressure. This model is a generalization of the well-known Rayleigh-Plesse
t equation describing dynamics of gas filled bubble in an incompressible f
luid. In the model considered in this work\, the fact that gas bubble is c
lose to an elastic wall of finite thickness is taken into account. Thus\,
the model depicts a bubble contrast agent\, oscillating in a neighborhood
of a blood vessel wall. Besides\, in the model being studied\, compressibi
lity and viscosity of the fluid are taken into consideration. In earlier w
orks\, dedicated to the dynamics of gas bubbles in a fluid\, the possibili
ty of existence of hidden attractors was not taken into account. In this w
ork we investigated different motion modes of the bubble oscillations. We
used perpetual points method to seek for hidden attractors. We have shown
that in the system under investigation there are hidden chaotic attractors
and co-existing periodic attractors. Also\, we have given an example of e
xistence of hidden chaotic attractor\, when the parameters of the system a
re physically realistic. As well\, it was shown that in the range of param
eters where this attractor exists\, if we vary frequency of the external f
orce\, system can unexpectedly switch from periodic motion to chaotic and
vice versa. The example mentioned above shows importance of finding of hid
den attractors for applications. If chaotic behavior is undesirable\, para
meters should be choosen in a way avoiding ranges where hidden attractors
exist.\n\nhttps://indico.jinr.ru/event/137/contributions/648/
LOCATION: 310
URL:https://indico.jinr.ru/event/137/contributions/648/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Partial analytic integration of Cosserat PDE system describing dyn
amics of slender structures
DTSTART;VALUE=DATE-TIME:20170706T073000Z
DTEND;VALUE=DATE-TIME:20170706T080000Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-649@indico.jinr.ru
DESCRIPTION:Speakers: Vladimir Gerdt (Joint Institute for Nuclear Research
)\nWe apply modern computer algebra methods and software for the Lie symme
try analysis to the governing Cosserat system of twelve nonlinear partial
differential equations (PDEs) describing dynamics of nearly one-dimensiona
l flexible structures (rods\, fibers\, cables\, etc.) and construct the ge
neral analytical solution to the kinematic part (six equations) of the sys
tem. The obtained solution depends on two arbitrary analytical vector func
tions\, and we show that its knowledge helps to resolve stiffness of the g
overning Cosserat system. Based on this result we develope algorithms base
d on combinations of numerical (exponential integration) and analytical (s
olver of differential equations built-in Maple) treatments of the dynamica
l part of the governing PDE system. Our approach allows for larger step si
zes compared to pure numerical solvers and at the same time combines effic
iency and accuracy without sanctifying one for another. Based on this obse
rvation\, we create a hybrid semi-analytical solver for highly viscous two
-way coupled fluid-rod problems which allows for the interactive high-fide
lity simulations of flagellated microswimmers\, as a result of a substanti
al reduction of the numerical stiffness. Besides\, we present in the talk
experimental comparison of our method with the so-called $\\alpha-$method\
, the best one among pure numerical methods developed for integrating Coss
erat equations\, and demonstrate superiority of our method.\n\nhttps://ind
ico.jinr.ru/event/137/contributions/649/
LOCATION: LIT Conference Hall
URL:https://indico.jinr.ru/event/137/contributions/649/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Extrapolation of functions of many variables by means of metric a
nalysis
DTSTART;VALUE=DATE-TIME:20170703T103000Z
DTEND;VALUE=DATE-TIME:20170703T104500Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-650@indico.jinr.ru
DESCRIPTION:Speakers: Alexander Kryanev (National Research Nuclear Univers
ity MEPhI\, Joint Institute for Nuclear Research)\, David Udumyan (Peoples
' Friendship University of Russia\, National Research Nuclear University M
EPhI\, University of Miami)\, Leonid SEVASTYANOV (PFUR)\, Victor Ivanov (J
oint Institute for Nuclear Research\, National Research Nuclear University
MEPhI)\nWe consider a problem of extrapolating functions of several varia
bles. It is assumed that the values of the function of m variables are giv
en at a finite number of points in some domain D of the m-dimensional spac
e. It is required to restore the value of the function at the points outsi
de the domain D. To solve the extrapolation problem\, we propose a scheme
which is based on a metric analysis approach. This scheme consists of two
stages. At the first stage\, using the metric analysis\, the function is i
nterpolated to the points of the domain D belonging to the segment of the
straight line connecting the center of the domain D to the point M in whic
h it is necessary to restore the value of the function. At the second stag
e\, based on the autoregression model and the metric analysis\, the functi
on values are predicted along the above straight-line segment beyond the d
omain D up to the point M. We present some numerical examples which demost
rate the efficiency of the proposed scheme.\n\nKeywords: function of many
variables\, extrapolation\, metric analysis\, interpolation\, autoregressi
on model.\n\nhttps://indico.jinr.ru/event/137/contributions/650/
LOCATION: 406A
URL:https://indico.jinr.ru/event/137/contributions/650/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Application of SLURM\, BOINC and GlusterFS as Software Complex for
Sustainable Modeling and Data Analytics
DTSTART;VALUE=DATE-TIME:20170704T123000Z
DTEND;VALUE=DATE-TIME:20170704T124500Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-651@indico.jinr.ru
DESCRIPTION:Speakers: Vladislav Kashansky (SUSU\, Dept. of Electrical Engi
neering and Computer Science)\nModern numerical modeling experiments and d
ata analytics problems in various fields of science and technology reveal
wide variety of serious requirements for distributed computing systems. Ma
ny scientific computing projects sometimes exceed allowed resource pool li
mits\, requiring extra scalability and sustainability. In this paper we s
hare the experience and findings of our own on combining power of SLURM\,
BOINC and GlusterFS as software complex for scientific computing. Especial
ly\, we suggest a complete architecture and highlight important aspects of
systems integration.\n\nhttps://indico.jinr.ru/event/137/contributions/65
1/
LOCATION: 406B
URL:https://indico.jinr.ru/event/137/contributions/651/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Transport Description of Heavy Ion Fragmentation Reactions at Ene
rgies of 35-140 MeV
DTSTART;VALUE=DATE-TIME:20170706T133000Z
DTEND;VALUE=DATE-TIME:20170706T134500Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-652@indico.jinr.ru
DESCRIPTION:Speakers: Tatiana Mikhaylova (LIT)\nFragmentation reactions ar
e of interest for the production of exotic beams and for accelerator drive
n applications. They have been well parametrized by empirical methods\, bu
t a microscopic understanding of the mechanism is of great interest. One s
uch method is the transport approach which describes the collision as a Ha
miltonian mean field propagation together with a dissipative two-body coll
ision term of the Boltzmann-type including Pauli blocking factors. The pro
pagation is treated in the Euler method\, while the collision term is simu
lated stochastically. Here we present a comparative study of such collisio
ns for light and intermediate mass systems in the energy range from Fermi
to intermediate energies in relation to experimental data from the FLNR\,
Dubna\, and other laboratories. The primary fragments obtained from the tr
ansport calculation are still excited by several MeV/A and the considerati
on of their de-excitation is important for the comparison to experiment. T
his is done using statistical multi-fragmentation approach\, where the inp
ut of the excitation energies of the primary fragments is calculated consi
stently with the transport method. We discuss the isotope yield distributi
ons as well as the energy or velocity distributions of the isotopes. \nFro
m the evolution with incident energy one sees an evolution of the mechanis
m of the fragmentation reactions. At the lower energies a substantial dire
ct component is seen \, which is not well described by the transport appro
ach\, while at higher energies the process is dominantly dissipative and i
s reasonably well reproduced by transport. This evolution is seen particul
arly in the velocity distributions\, which at lower incident energies disp
lay an undamped component\, probably due to direct transfer-type processes
. The main dissipative component is well described by transport\, however\
, the strongly damped tail of the velocity distribution is not well accoun
ted for. Here most likely fluctuations around the mean field evolution of
the system are responsible\, the implementation of which is one of the cur
rent developments in transport theory.\n\nhttps://indico.jinr.ru/event/137
/contributions/652/
LOCATION:
URL:https://indico.jinr.ru/event/137/contributions/652/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Using of machine learning algorithms to the problem of recognition
of vehicles tracks
DTSTART;VALUE=DATE-TIME:20170703T140000Z
DTEND;VALUE=DATE-TIME:20170703T143000Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-653@indico.jinr.ru
DESCRIPTION:Speakers: Natalia Puchkova (student)\nWithin the framework of
our project on modeling of urban transport traffic\, we consider the follo
wing task. There is a mobile application that continuously records the geo
graphic coordinates of the mobile device and data from its other sensors (
for example\, an accelerometer). These data form a "loaded" track - the tr
ajectory of the movement of the device\, the points of which are assigned
additional information. Our goal is to automatically extract from this raw
track those parts of it that correspond to the movement of the device on
the vehicle (car\, taxi\, bus). Collected in this way\, "transport" tracks
in the future should be combined into a single network - a scheme of traf
fic in a certain area. To solve this problem\, it is proposed to use algor
ithms of machine learning. We collected a database of training data - shor
t tracks (10 seconds) with a known type of traffic - "car" and "no car". T
hese data were used to construct a logistic regression to predict the like
lihood that a given track corresponds to movement on a car. A method for i
mproving recognition is proposed\, taking into account the connectedness o
f individual tracks (neighboring tracks should most likely belong to the s
ame type). The results of testing the proposed approach for the analysis o
f traffic tracks in the Dubna town are presented.\n\nhttps://indico.jinr.r
u/event/137/contributions/653/
LOCATION:
URL:https://indico.jinr.ru/event/137/contributions/653/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Mock Data Challenge for the MPD/NICA experiment on the HybriLIT cl
uster
DTSTART;VALUE=DATE-TIME:20170706T123000Z
DTEND;VALUE=DATE-TIME:20170706T124500Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-654@indico.jinr.ru
DESCRIPTION:Speakers: Konstantin Gertsenberger (JINR)\nThe simulated data
processing before receiving first experimental data is an important issue
in the high-energy physics experiments. This work presents Mock Data Chall
enge (MDC) for the MPD experiment at the NICA accelerator complex. It uses
the ongoing simulation studies to exercise in a stress-testing distribute
d computing infrastructure and experiment software in the full production
environment from simulated data through a physical analysis. The current E
vent Data Model of the MPD experiment will be shown\, and the MpdRoot soft
ware of the experiment based on this model will be noted. The report brief
ly describes a hardware part – the current structure of the heterogeneou
s computations cluster HybriLIT of the Laboratory of Information Technolog
ies. In addition\, software for parallelization of the MPD data processing
is noted. The MDC presented in the work allows one to test the full proce
ssing chain (simulation\, reconstruction and following physical analysis)
for the MC data stream parallelized by the MPD scheduling system on the Hy
briLIT cluster and helps to identify its potential issues.\n\nhttps://indi
co.jinr.ru/event/137/contributions/654/
LOCATION:
URL:https://indico.jinr.ru/event/137/contributions/654/
END:VEVENT
BEGIN:VEVENT
SUMMARY:BigData challenges and processing at present and future High Energ
y Physics and Nuclear Physics experiments and Computing Model Evolution
DTSTART;VALUE=DATE-TIME:20170705T070000Z
DTEND;VALUE=DATE-TIME:20170705T073000Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-655@indico.jinr.ru
DESCRIPTION:Speakers: Alexei Klimentov (Brookhaven National Lab)\nhttps://
indico.jinr.ru/event/137/contributions/655/
LOCATION: LIT Conference Hall
URL:https://indico.jinr.ru/event/137/contributions/655/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Modern approaches to synthesis\, stability analysis and verificati
on of nonlinear stochastic models of natural science
DTSTART;VALUE=DATE-TIME:20170704T133000Z
DTEND;VALUE=DATE-TIME:20170704T134500Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-656@indico.jinr.ru
DESCRIPTION:Speakers: Olga Druzhinina (Federal Research Center «Computer
Science and Control» of RAS and V.A. Trapeznikov Institute of Control Sci
ences of RAS)\nThe modern approaches to the nonlinear stochastic models sy
nthesis\, stability analysis and verification are characterized in the cur
rent work. One of the approaches is related to the self-consistent stochas
tic models constructing technique. Based on this technique\, the interacti
on schemes are constructed that includes the symbolic record of the possib
le interactions between the system elements. Then\, using the system state
operators and the state change operator\, the stochastic models structure
is described and the transition to the corresponding Fokker–Planck vect
or equation is performed\, and the rules for the transition to the multidi
mensional stochastic differential equation in Langevin form are formulated
. The specified approach allows us to estimate the influence of the stocha
stic injection on the properties of the models [1]. For the models under
study\, it is possible to carry out a numerical experiment with the appli
cation of the developed software package that allows us to solve the stoch
astic differential equations systems taking into account the features of t
he described transition from the deterministic case to the stochastic case
. The second approach is based on the transition from the deterministic de
scription of the model to the stochastic description and on the principle
of the stability problem reduction of the differential inclusion solutions
to the stability problem for other types of the equations [2\, 3]. In the
framework of this approach\, the usual\, fuzzy and stochastic Lyapunov fu
nctions are applied and from the unified point of view the stability prope
rties of the solutions of differential inclusions\, fuzzy and stochastic d
ifferential equations are studied. For obtaining the stability conditions\
, we use both the properties of Lyapunov functions and the divergence prop
erties of the vector fields determined by the right-hand sides of the diff
erential equations [4]. Based on the combination of the specified approach
es\, nonlinear mathematical models of the populations interactions are con
structed and studied [5\, 6]. The results can be used in the modeling prob
lems of the various classes of stochastic systems\, and also for comparing
the qualitative properties of the natural science and technics models in
deterministic and stochastic cases.\n\nhttps://indico.jinr.ru/event/137/co
ntributions/656/
LOCATION: 406A
URL:https://indico.jinr.ru/event/137/contributions/656/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The Numerical Evaluation of Universal Quantities of Directed Bond
Percolation: Three-loop Approximation
DTSTART;VALUE=DATE-TIME:20170703T130000Z
DTEND;VALUE=DATE-TIME:20170703T131500Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-657@indico.jinr.ru
DESCRIPTION:Speakers: Lukas Mizisin (JINR Dubna\, Pavol Josef Safarik Univ
ersity in Kosice)\nUniversal quantities (anomalous dimensions and critical
exponents) of directed bond percolation are calculated by the renormaliza
tion group method in higher order perturbation theory. We put forward a re
normalization procedure for a numerical calculation in which the quantitie
s are expressed in terms of irreducible renormalized Feynman diagrams. The
procedure is based on the perturbative renormalization scheme in formall
y small parameter $\\epsilon$\, where $\\epsilon = 4-d$ denotes a deviatio
n from an upper critical dimension. Numerical calculation of integrals ha
s been performed using Vegas algorithm from CUBA library. Main resulst of
our approach is a calculation of the dynamical exponent $z$ and the critic
al exponent $\\eta$ to the third order in $\\epsilon$ expansion.\n\nhttp
s://indico.jinr.ru/event/137/contributions/657/
LOCATION: 310
URL:https://indico.jinr.ru/event/137/contributions/657/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Fractional Langevin equation model for characterization of anomalo
us Brownian motion from NMR signals
DTSTART;VALUE=DATE-TIME:20170704T110000Z
DTEND;VALUE=DATE-TIME:20170704T111500Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-658@indico.jinr.ru
DESCRIPTION:Speakers: Vladimir Lisy (LRB JINR)\nNuclear magnetic resonance
(NMR) is non-destructive and one of the best developed tools to study ran
dom motion of spins in different systems\, including soft tissues such as
the brain\, heart and muscles. In the long-time limit the current mathemat
ical description of the experiments allows proper interpretation of measur
ements of normal and anomalous diffusion. The all-time dynamics is correct
ly considered only in a few works that however do not go beyond the standa
rd Langevin description of the Brownian motion (BM). In the present contri
bution\, the attenuation function S(t) for an ensemble of spins in a magne
tic-field gradient is calculated by accumulation of the phase shifts in th
e rotating frame that result from the motion of spin-bearing particles. Th
e found S(t)\, expressed through the particles’ mean square displacement
(MSD)\, is applicable for any kind of stationary stochastic dynamics of s
pins with or without a memory. We have studied in detail the model of the
fractional BM and obtained in a simple way the MSD of particles trapped in
a harmonic potential. The solution is used for the calculation of S(t). I
n the limit of free particles coupled to a fractal heat bath\, the results
compare favorably with experiments acquired in human neuronal tissues.\n\
nhttps://indico.jinr.ru/event/137/contributions/658/
LOCATION: LIT Conference Hall
URL:https://indico.jinr.ru/event/137/contributions/658/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Adaptation of swarm optimization algorithms to the swarm robotics
control problems
DTSTART;VALUE=DATE-TIME:20170703T140000Z
DTEND;VALUE=DATE-TIME:20170703T143000Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-659@indico.jinr.ru
DESCRIPTION:Speakers: Mikhail Raportirenko (Dubna State University)\nThe w
ork is devoted to the development of algorithms for control of robot swarm
s. The complexity of this problem lies in the fact that we should program
the behavior (identical) of the individual robot\, and the programming goa
l is the collective behavior of the entire swarm. At the same time\, there
are a number of search-type problems\, for example\, the problem of findi
ng the source of pollution\, which can be considered as optimization probl
ems. To solve such problems\, there is a well-designed class of algorithms
called swarm optimization algorithms (particle swarm optimization algorit
hm\, bacterial foraging optimization algorithm)\, which were originally de
signed on the basis of swarm behavior. However\, direct application of suc
h algorithms in swarm robotics is impossible due to the use of mechanisms
that can not be supported by real robots (instantaneous movement of robots
to any point in the decision space\, reproduction and selection). In addi
tion\, the very task of searching for a particular object inside given are
a can limit even the usual behavior of robots - for example\, the presence
of obstacles (walls) prevents the movement of robots even a short distanc
e. Such limitations in optimization problems are usually absent. The purpo
se of our research is to adapt the algorithms of swarm optimization to sol
ving search problems by swarm robots. We consider the model problem of se
arching for the source of a certain signal\, describe the adapted versions
of several classical algorithms of swarm optimization\, and present the r
esults of a numerical study of the efficiency of the developed algorithms.
We use NetLogo integrated environment as a modeling tool.\n\nhttps://indi
co.jinr.ru/event/137/contributions/659/
LOCATION:
URL:https://indico.jinr.ru/event/137/contributions/659/
END:VEVENT
BEGIN:VEVENT
SUMMARY:MODELING THERMAL EFFECTS IN METALS IRRADIATED BY COPPER NANOCLUSTE
RS
DTSTART;VALUE=DATE-TIME:20170704T103000Z
DTEND;VALUE=DATE-TIME:20170704T104500Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-660@indico.jinr.ru
DESCRIPTION:Speakers: Zafar Tukhliev (JOINT INSTITUTE FOR NUCLEAR RESEARCH
)\nOne of the promising and important areas in condensed matter physics is
the study of the interaction of nanoclusters with various metallic target
s [1]. When nanoclusters interact with a metal target in a small volume\,
there is a huge energy release per unit volume and this leads to structura
l changes. The origin of the structural changes can be a consequence of th
ermal processes or elastic interactions (repulsion of target atoms). In ex
perimental studies\, one can only see the effect of structural changes in
targets when irradiated with nanoclusters\, and the application of mathema
tical modeling techniques allows one to "see" the entire cycle of the targ
et irradiation process with nanoclusters.\nIn this paper we investigate th
ermal processes in metals irradiated with nanoclusters by the molecular dy
namics method and within the thermal speak model [2\, 3]. In the framework
of the molecular dynamics method\, the wave effects of heat transfer are
obtained\, what is not observed when the thermal peak model is used. The r
esults of simulation of the structural changes in irradiated targets of di
fferent sizes are also obtained depending on the energy of nanoclusters. W
hen processing results\, the fractal analysis method [4] is used.\nThe wor
k was financially supported by the RFBR grant No. 17-01-00661-a and partia
lly supported by a grant of the Plenipotentiary Representative of the Repu
blic of Bulgaria at the JINR.\n\nhttps://indico.jinr.ru/event/137/contribu
tions/660/
LOCATION:
URL:https://indico.jinr.ru/event/137/contributions/660/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Evolution of quantum steering of two bosonic modes in a squeezed t
hermal environment
DTSTART;VALUE=DATE-TIME:20170706T140000Z
DTEND;VALUE=DATE-TIME:20170706T141500Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-661@indico.jinr.ru
DESCRIPTION:Speakers: Tatiana Mihaescu (Horia Hulubei National Institute o
f Physics and Nuclear Engineering (IFIN-HH)\, Bucharest-Magurele\, Romania
)\nEinstein-Podolsky-Rosen steerability of quantum states is a property th
at is different from entanglement and Bell nonlocality. We describe the ti
me evolution of a recently introduced measure that quantifies steerability
for arbitrary bipartite Gaussian states in a system consisting of two bos
onic modes embedded in a common squeezed thermal environment.\nWe work in
the framework of the theory of open systems. If the initial state of the s
ubsystem is taken of Gaussian form\, then the evolution under completely p
ositive quantum dynamical semigroups assures the preservation in time of t
he Gaussian form of the states.\nIt was shown that the thermal noise and
dissipation introduced by the thermal environment destroy the steerability
between the two bosonic modes. In the case of the squeezed thermal bath w
e show the dependence of the Gaussian steering on the squeezing parameters
of the bath and of the initial state of the system. A comparison with oth
er quantum correlations for the same system shows that\, unlike Gaussian q
uantum discord\, which is decreasing asymptotically in time\, the Gaussian
quantum steerability suffers a sudden death behaviour\, like quantum enta
nglement.\n\nhttps://indico.jinr.ru/event/137/contributions/661/
LOCATION: LIT Conference Hall
URL:https://indico.jinr.ru/event/137/contributions/661/
END:VEVENT
BEGIN:VEVENT
SUMMARY:BM@N online monitoring
DTSTART;VALUE=DATE-TIME:20170707T121500Z
DTEND;VALUE=DATE-TIME:20170707T123000Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-677@indico.jinr.ru
DESCRIPTION:Speakers: Ilnur Gabdrakhmanov (VBLHEP JINR)\nThe BM@N experime
nt is the crucial stage in the technical development\nof the NICA project.
\nIn order to effectively maintain experiment it is extremely important\nt
o have uniform for all detectors\,\nfast and convenient tool to monitor ex
perimental facility.\nThe system implements decoding of the incoming raw d
ata on the fly\,\npreprocessing and visualization on the webpage.\nUsers c
an monitor any detector subsystem\, select specific detector's\nplane/stat
ion\, time or strip profile histograms in 1/2/3D view.\nThe system is deve
loped as a part of the BmnRoot package with the use\nof the CERN jsROOT li
brary. The lighttpd webserver is used.\n\nhttps://indico.jinr.ru/event/137
/contributions/677/
LOCATION: LIT Conference Hall
URL:https://indico.jinr.ru/event/137/contributions/677/
END:VEVENT
BEGIN:VEVENT
SUMMARY:INSTANTANEOUS CARDIAC RHYTHM RATE SPECTRUM BASED ON HOLTER MONITOR
ING DATA AND ITS FEATURES
DTSTART;VALUE=DATE-TIME:20170707T100000Z
DTEND;VALUE=DATE-TIME:20170707T101500Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-678@indico.jinr.ru
DESCRIPTION:Speakers: Victor Tsvetkov (Tver State University)\nTogether wi
th frequency characteristics of instantaneous cardiac rhythm (ICR)\, chara
cteristics related to the ICR change rate v are of great value for studies
in cardiology. According to the data from day-long Holter monitoring\, we
constructed the ICR change rate distribution function It was demonstrat
ed that for different patients the function had both the unimodal and the
polymodal characters. In many cases the is approximated accurately by th
e Laplace distribution In general\, the is approximated with the plenty
high enough accuracy by the linear combination of Laplace’s and Gaussia
n functions.\n\nhttps://indico.jinr.ru/event/137/contributions/678/
LOCATION: 406A
URL:https://indico.jinr.ru/event/137/contributions/678/
END:VEVENT
BEGIN:VEVENT
SUMMARY:ROADMAP FOR COMPUTER-AIDED MODELING OF THERANOSTICS AND RELATED NA
NOSYSTEMS.
DTSTART;VALUE=DATE-TIME:20170704T133000Z
DTEND;VALUE=DATE-TIME:20170704T134500Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-662@indico.jinr.ru
DESCRIPTION:Speakers: Tibor Kozar (Institute of Physics\, Pavol Jozef Safa
rik University\, Kosice\, Slovakia and Institute of Experimental Physics\,
Slovak Academy of Sciences\, Kosice\, Slovakia)\nThe key impact of nanote
chnologies on many areas of research and development has become prominent
in recent years. Biomedicine belongs to the most influenced fields by nano
technology\, for example thanks to the introduction of theranostics (syste
ms for combined diagnostics and therapeutic utilization). These systems ca
n be composed from metallic core nanoparticles functionalized with monolay
er-covered bio-active molecules. Despite the recent “state of the art”
level of molecular modeling methodologies and the number of articles publ
ished annually on noble-metal nanostructures\, this particular field is st
ill in discovery phase [1]. In addition\, detailed understanding of intera
ctions of such nanoparticles with biological membranes\, macromolecules an
d other entities of the living cell has crucial importance for elucidation
of the mechanisms governing biological actions of these nanosystems. Insi
ghts into molecular details how these nanomaterials interact with subcellu
lar nano-machinery of the cells can facilitate design and engineering of n
ew generation of nanoparticles [2]. We were interested in building and mod
eling thiolate-protected gold clusters and compute their static and dynami
c properties\, using our in-house hardware and software resources. In orde
r to compare the performance issues for modeling of such complex nanosyste
ms\, we performed comprehensive testing of available software protocols.\n
\nReferences\n1.Malola\, S. and H. Häkkinen\, How many gold atoms make go
ld metal? Europhysics News\, 2015. 46(4): p. 23-26 DOI: 10.1051/epn/201540
2.\n2.Yanamala\, N.\, V.E. Kagan\, and A.A. Shvedova\, Molecular modeling
in structural nano-toxicology: interactions of nano-particles with nano-ma
chinery of cells. Adv Drug Deliv Rev\, 2013. 65(15): p. 2070-7 DOI: 10.101
6/j.addr.2013.05.005.\n\nhttps://indico.jinr.ru/event/137/contributions/66
2/
LOCATION: LIT Conference Hall
URL:https://indico.jinr.ru/event/137/contributions/662/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Simulation of radiation damage to neural cells
DTSTART;VALUE=DATE-TIME:20170704T104500Z
DTEND;VALUE=DATE-TIME:20170704T110000Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-663@indico.jinr.ru
DESCRIPTION:Speakers: Batmunkh Munkhbaatar (LRB\, JINR)\nRadiation damage
to the central nervous system (CNS) has been an on-going challenge for the
last decades primarily due to the issues of brain radiotherapy and radiat
ion protection for astronauts during space travel. Although recent ﬁndin
gs revealed a number of molecular mechanisms associated with radiation-ind
uced impairments in behaviour and cognition\, some uncertainties exist in
the initial neuronal cell injury leading to the further development of CNS
malfunction. As usual\, these initial stages of neuronal injury are hardl
y accessible to experimental measurements. Many events cannot be investiga
tes experimentally at all. In this regard\, development of computation met
hods for assessing these early stages of radiation damage to CNS is of gre
at interest. \nTo help in understanding the physical and biological mecha
nisms underlying effects of cosmic and therapeutic types of radiation on C
NS\, we have developed an original microdosimetry application based on the
Monte-Carlo Geant4 toolkit\, in particular\, its biophysical extension of
Geant4-DNA [1\, 2]. The applied simulation technique provides a tool for
simulation of physical\, physico-chemical and chemical processes (e.g. pro
duction of water radiolysis species in the vicinity of neurons) in realist
ic geometrical model of neuronal cells exposed to particle radiation. The
present study is performed to evaluate microscopic dose depositions and wa
ter radiolysis species yields within a detailed structure of individual ne
urons taking into account such cell components as soma\, dendrites\, axon
and spines. To demonstrate benefits of the developed approach\, the calcul
ations were made for proton\, 12C and 56Fe of different energy within a re
latively wide range of linear energy transfer values from a few to hundred
s of keV/μm. Simulation results indicate that the neuron morphology is an
important factor determining the accumulation of microscopic radiation do
se and water radiolysis products in neurons. The estimation of the radioly
tic yields in neural cells suggests that the observed enhancement in the l
evels of reactive oxygen species may potentially lead to oxidative damage
to neuronal components disrupting the normal communication between cells o
f the neural network.\n\n[1] M. Batmunkh\, O.V. Belov\, L. Bayarchimeg\, O
. Lkhagva\, N.H. Sweilam\, Estimation of the spatial energy deposition in
CA1 pyramidal neurons under exposure to 12C and 56Fe ion beams\, // J. Rad
iat. Res. Appl. Sci. 2015. 8:498-507.\n[2] O.V. Belov\, M. Batmunkh\, S. I
ncerti\, O. Lkhagva\, Radiation damage to neuronal cells: Simulating the e
nergy deposition and water radiolysis in a small neural network // Physica
Medica 2016. 32:1510-1520.\n\nhttps://indico.jinr.ru/event/137/contributi
ons/663/
LOCATION: LIT Conference Hall
URL:https://indico.jinr.ru/event/137/contributions/663/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Diffusion processes in A model of vector admixture: Turbulent Pran
dtl number
DTSTART;VALUE=DATE-TIME:20170704T113000Z
DTEND;VALUE=DATE-TIME:20170704T114500Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-664@indico.jinr.ru
DESCRIPTION:Speakers: Richard Remecky (BLTP JINR\, Dubna)\nOne of the most
important characteristics of diffusion processes in fluids is the Prandtl
number as a ratio of the coefficient of kinematic viscosity to the coeffi
cient of the corresponding diffusivity. The numerical values of various Pr
andtl numbers\, in general\, depend on the microscopic structure of the fl
uids at low Reynolds numbers. The situation changes when the Reynolds numb
ers obtain very high values\, i.e.\, in the so-called fully developed turb
ulence regime. Here\, the Prandtl numbers obtain universal values which a
re known as ``effective’’ or “turbulent’’ Prandtl numbers. Recen
tly\, the turbulent Prandtl numbers were studied in various models of pass
ive admixtures (scalar or vector) in fully developed turbulence given by t
he stochastic Navier-Stokes equation using the field theoretic renormaliza
tion group technique in the second order of the perturbative expansion (tw
o-loop approximation) [1\,2\,3\,4]. \n\nIn the present work the behavior o
f the turbulent vector Prandtl number is investigated as the function of t
he spatial dimension d > 2 in the framework of the general A model of pass
ively advected vector field\, where three important and physically interes
ting cases\, namely\, kinematic MHD (A = 1)\, linearized Navier-Stokes equ
ation (A = -1) and admixture of a vector impurity by the N-S turbulent flo
w (A = 0)\, are included. The behavior of the turbulent Prandtl number is
studied in the model with the Navier-Stokes fully developed turbulence. Us
ing the field theoretic renormalization group approach in the two-loop app
roximation we analyzed the dependence of the turbulent vector Prandtl numb
er on the parameter A as well as on the spatial dimension d. For detailed
analysis and results see [5].\n\nhttps://indico.jinr.ru/event/137/contribu
tions/664/
LOCATION:
URL:https://indico.jinr.ru/event/137/contributions/664/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Speed up approaches in the Cellular Automaton track finder
DTSTART;VALUE=DATE-TIME:20170707T103000Z
DTEND;VALUE=DATE-TIME:20170707T104500Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-665@indico.jinr.ru
DESCRIPTION:Speakers: Grigory Kozlov (LIT JINR Dubna\, FIAS Frankfurt)\nTr
acking procedure is an important part of event reconstruction in high ener
gy physics experiments. One of the fastest and efficient track finding alg
orithm is a cellular automaton (CA). It is used in various experiments inc
luding CBM at FAIR and STAR at RHIC. CBM and STAR CA track finders have si
milar implementations. But standard track finding procedure may be not fas
t enough for online calculations\, especially in case of high particle mul
tiplicity.\nIn this work we consider several methods to speed up CA track
finders in STAR and CBM. Different approaches were implemented and investi
gated. For instance\, grid structure allows us to seriously reduce the num
ber of calculations when hits are combined into segments. Using of multima
p for merging of neighbouring segments help us quickly exclude impossible
combinations. In addition\, CA track finder was vectorized taking into acc
ount scalability for CPUs with SSE and AVX instructions (128 and 256 bit r
egisters). Appropriate data structures provides to reduce combinatorial ca
lculations and optimise memory usage\, which leads to nice speed up for ve
ctorized calculations.\nMost of used approaches are common and can be easi
ly applied to different versions of CA tracking algorithms.\n\nhttps://ind
ico.jinr.ru/event/137/contributions/665/
LOCATION: LIT Conference Hall
URL:https://indico.jinr.ru/event/137/contributions/665/
END:VEVENT
BEGIN:VEVENT
SUMMARY:FULLY DIFFERENTIAL CROSS SECTIONS FOR SINGLE IONIZING 1-MEV P+HE C
OLLISIONS AT SMALL MOMENTUM TRANSFER
DTSTART;VALUE=DATE-TIME:20170704T131500Z
DTEND;VALUE=DATE-TIME:20170704T133000Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-684@indico.jinr.ru
DESCRIPTION:Speakers: Ochbadrakh Chuluunbaatar (LIT JINR)\nWe present ultr
ahigh resolution data on single ionization of helium under impact of 1-MeV
protons in comparison with theoretical calculations. Good agreement betwe
en theory and experiment is obtained. Three initial trial helium wave func
tions are employed: a weakly correlated Roothaan-Hartree-Fock function\, a
simple Silverman-Platas-Matsen function of the configuration interaction
family\, and a strongly correlated function. Multidimensional singular int
egrals which defining differential cross sections are calculated using spe
cial transform for each above trial function.\n\nhttps://indico.jinr.ru/ev
ent/137/contributions/684/
LOCATION: 406A
URL:https://indico.jinr.ru/event/137/contributions/684/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Showers Simulation Study over Caucasus Region by WRF Model Based o
n Grid Computing
DTSTART;VALUE=DATE-TIME:20170704T104500Z
DTEND;VALUE=DATE-TIME:20170704T110000Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-666@indico.jinr.ru
DESCRIPTION:Speakers: Nato Jiadze (Ministry of Defense of Georgia)\, Teimu
razi Davitashvili (. I.Vekua Institute of Applied mathematics of Tbilisi S
tate University)\nThe main goal of this paper is investigation of some sin
gularities and specific features of atmosphere flows above the complex ter
rain of the Georgian territory\, for prediction a regional scale dangerous
events (heavy rains\, hails) formation by different cumulus parameterizat
ion (CPSs) and micro physics (MP) schemes. To achieve the specified goal\
, we have used 3-D non-hydrostatic\, non-stationary Whether Research Forec
ast - Advanced Researcher Weather (WRF-ARW) version 3.6 model. We have co
nfigured the WRF-ARW nested grid model for Caucasus region considering geo
graphical-landscape character\, topography height\, land use\, soil type a
nd temperature in deep layers\, vegetation monthly distribution\, albedo a
nd others. Investigations required High Performance Computer systems. That
is way we have ported the WRF-ARW application to the GRID site GE-01-GREN
A in Georgia which is located at Georgian Research and Educational Network
s Association (GRENA). As GRENA connected in European GRID infrastructure
so it was a good opportunity for running model on larger number of CPUs an
d storing large amount of data on the grid storage elements. The ability o
f the WRF model in prediction precipitations with different set of these M
P and CPSs was examined using two precipitation events occur on the territ
ory of eastern Georgia for warm season of 2015. Two set of domains with ho
rizontal grid-point resolutions of 6.6 and 2.2 km are chosen to represent
complex topography in current research WRF v.3.6 model. Accumulated total
(24 h) precipitations are evaluated by careful examination of meteorologic
al radar and radio zoned data and simulated fields. Some results of the nu
merical calculations performed by WRF model are presented.\n\nhttps://indi
co.jinr.ru/event/137/contributions/666/
LOCATION: 406B
URL:https://indico.jinr.ru/event/137/contributions/666/
END:VEVENT
BEGIN:VEVENT
SUMMARY:On generation of random ensembles of mixed states for quantum bipa
rtite systems
DTSTART;VALUE=DATE-TIME:20170706T123000Z
DTEND;VALUE=DATE-TIME:20170706T124500Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-667@indico.jinr.ru
DESCRIPTION:Speakers: Ilia Rogojin (JINR)\nTwo methods of generation of ra
ndom ensembles of mixed quantum states of different ranks are discussed. T
he first method exploits the Ginibre ensemble of complex square random mat
rices\, while the second one is based on the singular value decomposition
of density matrices. Distribution properties of the “probability of enta
nglement” in composite systems consisting from qubit-qubit and qubit-qut
rit pairs are studied using both approaches to generate random Hilbert-Sch
midt and Bures ensembles of quantum states of all possible ranks.\n\nhttps
://indico.jinr.ru/event/137/contributions/667/
LOCATION: LIT Conference Hall
URL:https://indico.jinr.ru/event/137/contributions/667/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Precise Frequency-Pattern Analysis Reveals the Functional Structur
e of Complex Systems
DTSTART;VALUE=DATE-TIME:20170704T050000Z
DTEND;VALUE=DATE-TIME:20170704T053000Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-668@indico.jinr.ru
DESCRIPTION:Speakers: Mikhail Ustinin (Keldysh Institute of Applied Mathem
atics)\nA method for the analysis of complex oscillating electrical system
s was proposed [1]\, based on the multichannel measurements of magnetic fi
eld through the hundreds of seconds. Using whole registration time\, the F
ourier transform of the data is performed\, leading to detailed spectra wi
th many frequency components. Further analysis results in total decomposit
ion of the system into functionally invariant entities\, each of them havi
ng invariant field pattern. The method of functional tomography is describ
ed\, making it possible to distribute in space the energy of magnetic fiel
d sources. Method was verified on the physical phantoms with highly satisf
actory results. This approach was applied in different studies of the huma
n brain [2]\, heart and hand\, providing the three-dimensional arrays of s
ources distribution in the space of measurement. Generally corresponding t
o anatomy of the systems under study\, those 3D arrays reveal their functi
onal structure. Recently the method was successfully applied to localizati
on of magnetic nanoparticles without pre-magnetization or displacement of
the sample [3].\n\n1. Llinas R.R.\, Ustinin M.N. Precise Frequency-Pattern
Analysis to Decompose Complex Systems into Functionally Invariant Entitie
s: U.S. Patent. US Patent App. Publ. 20160012011 A1. 01/14/2016.\n2. Llina
s R.R.\, Ustinin M.N.\, Rykunov S.D.\, Boyko A.I.\, Sychev V.V.\, Walton K
.D.\, Rabello G.M. and Garcia J. Reconstruction of human brain spontaneous
activity based on frequency-pattern analysis of magnetoencephalography da
ta. Frontiers in Neuroscience. 2015. V. 9. P. 373. doi: 10.3389/fnins.2015
.00373.\n3. Polikarpov M.A.\, Ustinin M.N.\, Rykunov S.D.\, Yurenya A.Y.\,
Naurzakov S.P.\, Grebenkin A.P.\, Panchenko V.Y. 3D imaging of magnetic p
articles using the 7-channel magnetoencephalography device without pre-mag
netization or displacement of the sample // Journal of Magnetism and Magne
tic Materials. 2017. Vol. 427. P. 139–143. doi:10.1016/j.jmmm.2016.10.05
5.\n\nThis work was partially supported by the Russian Foundation for Basi
c Research (grants 16-0700937\, 16-07-01000\, 17-07-00677\, 17-07-00686)\,
by the Program I.33P for Fundamental Research of the Russian Academy of S
ciences\, and by the CRDF Global (USA) (grants CRDF RB1-2027 and RUB-7095-
MO-13).\n\nhttps://indico.jinr.ru/event/137/contributions/668/
LOCATION: LIT Conference Hall
URL:https://indico.jinr.ru/event/137/contributions/668/
END:VEVENT
BEGIN:VEVENT
SUMMARY:NEW METHODS FOR CALCULATION OF COMPLICATED FUNCTIONAL INTEGRALS
DTSTART;VALUE=DATE-TIME:20170703T140000Z
DTEND;VALUE=DATE-TIME:20170703T143000Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-669@indico.jinr.ru
DESCRIPTION:Speakers: Purevkhuu Munkhbaatar (Ulaanbaatar\, Mongolia)\nWe p
resent an elegant method for calculation of complicated integrals by using
the Mellin representation. In this paper\, the passage to a complex plane
plays a vital role in obtaining universal formulas for taking enormous nu
mber of integrals from sign variables functions.\n\nhttps://indico.jinr.ru
/event/137/contributions/669/
LOCATION:
URL:https://indico.jinr.ru/event/137/contributions/669/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The Boundary Value Problem for Elliptic Equation in the Corner Dom
ain in the Numerical Simulation of Magnetic Systems
DTSTART;VALUE=DATE-TIME:20170703T104500Z
DTEND;VALUE=DATE-TIME:20170703T110000Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-670@indico.jinr.ru
DESCRIPTION:Speakers: Evgeny Perepelkin (JINR)\nThe formula¬tion of the b
oundary value problem arises in magnitostatics when finding the mag¬netic
field distribution by the method of two scalar potentials in the domain c
om¬prising ferromagnetic and vacuum. The problem nonlinearity is stipulat
ed by the dependence of the medium properties (magnetic permeability) on t
he solution to be found. In connection with that the solution of such a pr
oblem has to be found by numerical methods\, a question arises about the b
ehavior of the boundary value problem solution around the angular point (t
he intersection of two environments-vacuum/iron) of the ferromagnetic. The
upper estimate for the acceptable growth of the magnetic field in the vac
uum region near the corner point of the ferromagnet has been obtained. It
is shown that under certain conditions imposed on the magnetic permeabili
ty\, the magnetic field within the vacuum region in the vicinity of the co
rner points is limited. An algorithm of thickening differential grid near
the corner point has been developed. It allows one to significantly reduce
the computation time and simultaneously to increase the accuracy of the s
olution of the boundary value problem. The results of modeling the magneti
c system containing corner points are presented. The problems of creating
a homogeneous map of the field of possible solenoid-type magnetic systems
of the NICA installation are analyzed. The computations were performed wit
h the help of two software products\, i.e. TOSCA and MFC (Magnetic Field C
alculation) developed by the authors.\n\nKey words and phrases: magnet sys
tems\, mathematical modeling\, boundary value problem\, elliptic equations
\, the behavior of solutions in the corner domain.\n\nhttps://indico.jinr.
ru/event/137/contributions/670/
LOCATION: 406A
URL:https://indico.jinr.ru/event/137/contributions/670/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Multiscale simulations of neuronal receptors
DTSTART;VALUE=DATE-TIME:20170703T063000Z
DTEND;VALUE=DATE-TIME:20170703T070000Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-685@indico.jinr.ru
DESCRIPTION:Speakers: Paolo Carloni (Forschungszentrum Jülich GmbH)\nMole
cular dynamics simulations of proteins may differ by the granularity of th
e underlying force fields (from quantum to coarse grain). At times\, it is
very useful to combine different descriptions in a hybrid description. He
re I will present recent hybrid Quantum Mechanics/Molecular Mechanics (QM/
MM) – and MM/coarse grain (CG) based investigations of targets for pharm
aceutical intervention. The predictive power and limitations of these mult
i-scale methods will be illustrated. The talk will close with a brief surv
ey of multi-scale simulations within the recently formed consortium of the
Human Brain Project\, one of the two flagships grant funded by the EU.\nT
he HPC-Leap\, BioExel\, Human Brain Project EU grants\, along with the Ger
man agencies DFG and BMBF agencies are acknowledged for funding part of th
is research.\n\nhttps://indico.jinr.ru/event/137/contributions/685/
LOCATION:
URL:https://indico.jinr.ru/event/137/contributions/685/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Development of the geometry database for the CBM experiment
DTSTART;VALUE=DATE-TIME:20170706T133000Z
DTEND;VALUE=DATE-TIME:20170706T134500Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-671@indico.jinr.ru
DESCRIPTION:Speakers: Elena Akishina (JINR)\nThe CBM (Compressed Baryonic
Matter) experimental facility that is being built at GSI (Darmstadt\, Germ
any) at the accelerator complex of antiprotons and heavy ions FAIR (Facili
ty for Antiproton and Ion Research) is intended for studying the propertie
s of superdense baryonic matter generating in 2-45 GeV/nucleon proton-nucl
ear and nucleus-nucleus collisions [1].\nAt the current moment\, the CBM c
ollaboration moves from the stage of prototypes research and tests to the
detectors and their components production. A high level control for the ma
nufacturing process is required because of the complexity and high price o
f the detector components.\nAs a result\, there is a need for the developm
ent of a database complex for the CBM experiment. In the paper [2] we brie
fly discussed a complex of Database Management Systems (DBMS) for the CBM
collaboration and described a current status of its implementation. The DB
MS structure was developed on the basis of databases usage at LHC and othe
r high energy physics experiments [2]. \nHere we present the current state
of developments of the Geometry DB (Geometry Database) for the CBM experi
ment. The Geometry DB supports the CBM geometry\, which describes the CBM
experimental setup at the detail level required for simulation of particle
s transport through the setup using GEANT3 [3]. \nOn the basis of the requ
irements the Geometry Database [4] has been developed in frameworks of the
PostgreSQL and SQLite DBMS. The main purpose of this database is to provi
de convenient tools for: 1) managing the geometry modules (MVD\, STS\, RIC
H\, TRD\, RPC\, ECAL\, PSD\, Magnet\, Beam Pipe)\; 2) assembling various v
ersions of the CBM setup as a combination of geometry modules and addition
al files (Field\, Materials)\; 3) providing support of various versions of
the CBM setup. The CBM users of the Geometry Database may use both GUI (G
raphical User Interface) and API (Application Programming Interface) tools
for working with it. \n\n1. Friman B. et al. Compressed Baryonic Matter i
n Laboratory Experiments // The CBM Physics Book— 2011.\n2. E.P. Akishin
a\, E.I. Alexandrov\, I.N. Alexandrov\, I.A. Filozova\, V. Friese\, V.V. I
vanov: Conceptual Consideration for CBM Databases\, Communication of JINR\
, E10-2014-103\, Dubna\, 2014.\n3. GEANT - Detector Description and Simula
tion Tool\, CERN Program Library\, Long Write-up\, W5013 (1995).\n4. User
Requirements Document of the Geometry Database for the CBM experiment htt
p://lt-jds.jinr.ru/record/69336?ln=en\n\nhttps://indico.jinr.ru/event/137/
contributions/671/
LOCATION:
URL:https://indico.jinr.ru/event/137/contributions/671/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Quantum dynamics of a hole migration through DNA.
DTSTART;VALUE=DATE-TIME:20170704T060000Z
DTEND;VALUE=DATE-TIME:20170704T063000Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-672@indico.jinr.ru
DESCRIPTION:Speakers: Sergey Shirmovsky (Theoretical and Nuclear Physics C
athedra\, Far Eastern Federal University)\nA model predicting the behavior
of a hole acting on the DNA strand was investigated. The hole-DNA interac
tion on the basis of a quantum-classical\, non-linear DNA single strand mo
del was described. The fact that a DNA molecule is formed by a furanose ri
ng as its sugar\, phosphate group and bases was taken into consideration.
Based on the model\, results were obtained for the probability of a hole l
ocation on the DNA base sequences as well as on the sugar-phosphate groups
mated with them. \nThe above considered model results in the following c
onclusions: the hole migration is a quantum phenomenon. The tunnel effect\
, owing to which the hole migrates through the chain bypassing the bases w
ith a high ionization potential\, influences the process of its migration
considerably. The period of the hole migration lies in the range of time s
cales on which various processes in biomolecules and their solutions occur
\; the sugar-phosphate backbone possesses conducting properties affecting
the hole migration process through the DNA strand considerably.\n\nhttps:/
/indico.jinr.ru/event/137/contributions/672/
LOCATION: LIT Conference Hall
URL:https://indico.jinr.ru/event/137/contributions/672/
END:VEVENT
BEGIN:VEVENT
SUMMARY:ON A METHOD OF INVESTIGATION NONLINEAR SELF-CONSISTENT EIGENVALUE
PROBLEM WITH THE GROWING POTENTIALS
DTSTART;VALUE=DATE-TIME:20170703T140000Z
DTEND;VALUE=DATE-TIME:20170703T143000Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-673@indico.jinr.ru
DESCRIPTION:Speakers: Nil Ratan Sarker (JINR)\nSuccess in solving multipar
ticle problems is in many cases connected with the choice of an adequate m
odel. As a simple example\, we can cite the concept of a polaron as a prob
lem of an autolocalized electron in an ionic crystal. At present\, there a
re a large number of physical examples [1-3]\, the theory of polarons\, bi
polarons\, a strong-coupling binucleon model\, a generalized polaron model
\, etc. The effect of autolocalization in liquids leads to the formation o
f solvated electrons in them\, which play an important role in many chemic
al processes [4\, 5]. Similar problems arise in the nonrelativistic potent
ial model at the description of the spectrum of heavy quarkonia [6]. To st
udy such problems\, one can involve methods of self-consistent description
of multiparticle systems.\nA method is proposed for investigating the pro
perties of solutions of a nonlinear self-consistent boundary value problem
with increasing potentials of even and odd powers. A comparative analysis
of the solutions of the linear boundary value problem for a quadratic gro
wing potential with a nonlinear self-consistent boundary value problem for
this potential is carried out. Formulas are obtained which allow us to ca
lculate the shift of the eigenvalues. If the distances between the levels
of a linear problem are equidistant\, then in a self-consistent problem th
is property is also satisfied. In addition\, when investigating problems w
ith potentials above the quadratic one\, new growing potentials appear to
a lesser degree in the self-consistent problem than the original potential
.\nReferences\n1. N.I. Kashirina\, V.D. Lakhno\, Mathematical modeling of
autolocalized states in condensed media. Moscow: Fizmatlit. -2013. -292 p.
\n2. I.V. Amirkhanov\, V.D. Lakhno\, I.V. Puzynin\, T.A. Strizh\, V.K. Fed
yayin. Numerical investigation of a nonlinear self-consistent eigenvalue p
roblem in the generalized polaron model. Preprint\, Biological Studies of
the Academy of Sciences of the USSR\, Pushchino. -1988. -23 p.\n3. I.V. Am
irkhanov\, I.V. Puzynin\, T.A. Strizh\, V.D. Lakhno. Solution of LLP equat
ions in bipolaron theory. Bulletin of the Academy of Sciences\, series of
physical. -V.59. -N.8. -1995. -P.106-110.\n4. Thompson J. Electrons in liq
uid ammonia. Moscow: Mir. - 1979.-138 p.\n5. I.V. Amirkhanov\, I..V. Puzyn
in\, T.A. Strizh\, O.V. Vasilyev\, V.D. Lakhno. Numerical study of a nonli
near self-consistent eigenvalue problem in the generalized model of a solv
ated electron. Preprint\, Biological Studies of the USSR\, Pushchino\, -19
90\, -24 p. \n6. A.A. Bykov\, I.M. Dremin\, A.V. Leonidov. -UFM. -V.143. -
P.3. -1984.\n\nThe work was carried out at the financial support of the RF
BR grant\, No. 17-01-00661a.\n\nhttps://indico.jinr.ru/event/137/contribut
ions/673/
LOCATION:
URL:https://indico.jinr.ru/event/137/contributions/673/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Numerical modelling of normal and superconducting properties of th
e doped graphane
DTSTART;VALUE=DATE-TIME:20170706T103000Z
DTEND;VALUE=DATE-TIME:20170706T104500Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-674@indico.jinr.ru
DESCRIPTION:Speakers: Aleksandr Kutukov (National Research Nuclear Univers
ity MEPhI)\nThe normal properties of graphane with various degrees of dopi
ng are calculated with the help of the generalized Eliashberg theory. With
in the theory of strong electron-phonon interaction\, a superconducting or
der parameter of the doped graphane has been found. The classical approach
for determining the critical temperature of a superconducting transition
as a result of a strong electron-phonon interaction does not involve calcu
lating the renormalization of the density of electronic states and the che
mical potential. In this work the critical temperature of superconductivit
y of graphane has been calculated as a function of the doping degree takin
g into account the renormalization of the electron mass\, the chemical pot
ential\, and the density of electronic states.\nAcknowledgement\nThis work
was supported by the Ministry of Education and Science of the Russian Fed
eration(base part of state task\, project no. 1.9746.2017/BCh)\n\nhttps://
indico.jinr.ru/event/137/contributions/674/
LOCATION: 406A
URL:https://indico.jinr.ru/event/137/contributions/674/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Machine learning and complex networks for precision and systems bi
omedicine
DTSTART;VALUE=DATE-TIME:20170704T080000Z
DTEND;VALUE=DATE-TIME:20170704T083000Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-675@indico.jinr.ru
DESCRIPTION:Speakers: Carlo Cannistraci (Technische Universität Dresden)\
nAbstract\nThe talk will present our research at the Biomedical Cybernetic
s Group that I established about three years ago in Dresden. We adopt a tr
ansdisciplinary approach integrating information theory\, machine learning
and network science to investigate the physics of adaptive processes that
characterize complex interacting systems at different scales\, from molec
ules to ecosystems\, with a particular attention to biology and medicine.
Our theoretical effort is to translate advanced mathematical paradigms typ
ically adopted in theoretical physics (such as topology\, network and mani
fold theory) to characterize many-body interactions in complex systems and
quantitative biomedicine. We apply the theoretical frameworks we invent i
n the mission to develop computational tools for systems and network analy
sis. In particular\, in biomedicine we deal with: prediction of wiring in
biological networks\, combinatorial and multiscale biomarkers design\, pre
cision biomedicine\, drug repositioning and combinatorial drug therapy. In
general\, we devise theoretical models of structural organization in comp
lex networks and we leverage this knowledge to create novel and more effic
ient algorithms and to perform advanced analyses and predictions of patter
ns in complex systems. This talk will focus on two main theories. Firstly\
, Minimum Curvilinearity\, which is a theory for topological estimation of
nonlinear relations in high-dimensional data1 (or in complex networks2) a
nd its relevance for machine learning applications in biomedicine. The new
topic on the impact of Minimum Curvilinearity for network embedding in th
e hyperbolic space will be also treated3. Secondly\, we will discuss the L
ocal Community Paradigm (LCP)4\,5\, which is a theory proposed to model lo
cal-topology-dependent link-growth in complex networks and therefore it is
useful to devise topological methods for link prediction in monopartite a
nd bipartite5 networks. In particular\, we will discuss the impact of this
new method for pioneering topological methods for network-based drug-targ
et interaction prediction and repositioning6.\n\nReferences (* indicates f
irst co-authorship)\n1. Cannistraci\, C. V.\, Ravasi\, T.\, Montevecchi
\, F. M.\, Ideker\, T. & Alessio\, M. Nonlinear dimension reduction and cl
ustering by minimum curvilinearity unfold neuropathic pain and tissue embr
yological classes. Bioinformatics 26\, i531–i539 (2010).\n2. Cannistr
aci\, C. V.\, Alanis-Lobato\, G. & Ravasi\, T. Minimum curvilinearity to e
nhance topological prediction of protein interactions by network embedding
. in Bioinformatics 29\, (2013).\n3. Thomas\, J. M.\, Muscoloni\, A.\,
..\, & Cannistraci\, C. V. Machine learning meets network science: dimens
ionality reduction for fast and efficient embedding of networks in the hyp
erbolic space. (2016). at \n4. Cannistraci\, C. V.\, Alanis-Lobato\, G.
& Ravasi\, T. From link-prediction in brain connectomes and protein inter
actomes to the local-community-paradigm in complex networks. Sci. Rep. 3\,
1–13 (2013).\n5. Daminelli\, S.\, Thomas\, J. M.\, Durán\, C. & Vit
torio Cannistraci\, C. Common neighbours and the local-community-paradigm
for topological link prediction in bipartite networks. New J. Phys. 17\, 1
13037 (2015).\n6. Duran\, C.\, … & Cannistraci\, C.V.. Pione
ering topological methods for network-based drug-target prediction. Briefi
ngs in Bioinformatics (to appear 2017)\n\nhttps://indico.jinr.ru/event/137
/contributions/675/
LOCATION:
URL:https://indico.jinr.ru/event/137/contributions/675/
END:VEVENT
BEGIN:VEVENT
SUMMARY:CRITICAL POINTS OF EXTENDED PHASE SPACE OF INSTANTANEOUS CARDIAC R
HYTHM AS CARDIOVASCULAR SYSTEM STATE MARKERS
DTSTART;VALUE=DATE-TIME:20170707T093000Z
DTEND;VALUE=DATE-TIME:20170707T094500Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-676@indico.jinr.ru
DESCRIPTION:Speakers: Dmitry Lebedev (Tver State University)\nOne of the m
ost effective instantaneous cardiac rhythm (ICR) imaging methods is applic
ation of extended phase space (EPS) of ICR. In this space\, the ICR state
is described by a point in the with coordinates where – ICR rate
\, – ICR change rate\, – retry equal values y and v in different t
ime moments.\nWe wrote down and implemented the MAPLE programs allowing th
e real-time monitoring of the dynamics of EPS of ICR. In this work\, we de
monstrate the actual examples of this dynamics based on the results of Hol
ter monitoring of patients of the Tver Cardiology Health Center.\nIt was d
emonstrated that the EPS structure corresponded with the patient statuses
determined by standard cardiology methods.\nThere were found critical poin
ts of EPS of ICR representing the centres of attraction of phase trajector
y. Geometrically this appears as high and narrow EPS peaks. Near the peaks
\, the phase point spends sufficiently long time thus giving deterministic
tone to ICR. The critical points of EPS of ICR are determined by cardiova
scular system state features\, and undoubtedly can be its markers.\n\nhttp
s://indico.jinr.ru/event/137/contributions/676/
LOCATION: 406A
URL:https://indico.jinr.ru/event/137/contributions/676/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Reduced model of electron transfer in photosystem II inhibited by
DCMU
DTSTART;VALUE=DATE-TIME:20170704T130000Z
DTEND;VALUE=DATE-TIME:20170704T131500Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-679@indico.jinr.ru
DESCRIPTION:Speakers: Tatiana Plyusnina (Lomonosov Moscow State University
)\nPhotosystem II (PSII) is one of the cue protein complexes involved in p
hotosynthesis. It carries out the transfer of electrons from oxygen evolvi
ng complex (OEC) to the plastoquinone in the time range from picoseconds t
o hundreds of milliseconds. The fluorescence emitted by the antenna pigmen
ts of PSII is an important marker of the photosynthesis activity. Differen
t phases of fluorescence transient reflect definite stages of electron tra
nsfer in PSII\, but the interpretation of fluorescence transient is not fu
lly clear because of the complexity of PSII. To get more simple system for
studying the inhibitor DCMU\, which blocks transfer of electron to plasto
quione\, is used.\nIn this work we developed the detailed model of electro
n transfers in PSII treated with DCMU. The model describe transitions of d
ifferent states of PSII\, which mediate electron transfer from OEC to prim
ary quinone. The model possesses 24 ordinary differential linear equations
. Time hierarchy of processes allowed us to apply Tikhonov’s theorem and
reduce this system to three ordinary differential linear equations. The p
arameters of novel reduced model are the expressions that consists of orig
inal parameters of the fully model. We derived the analytical solution of
the reduced model as the sum of three exponential functions. The final thr
ee-exponential expression describes three slow stages of electron transfer
: light-dependent stage and two stages of electron transfer by OEC. This a
nalytical solution allowed us to get single-valued fitting of experimental
curves and analyze some changes in PSII of algae growth under different l
ight conditions.\n\nhttps://indico.jinr.ru/event/137/contributions/679/
LOCATION: LIT Conference Hall
URL:https://indico.jinr.ru/event/137/contributions/679/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Percolation process in the Presence of Velocity Fluctuations: Two-
loop Approximation
DTSTART;VALUE=DATE-TIME:20170703T124500Z
DTEND;VALUE=DATE-TIME:20170703T130000Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-680@indico.jinr.ru
DESCRIPTION:Speakers: Sarlota Birnsteinova (Slovak)\nCritical behaviour of
directed bond percolation is studied in presence of an advective velocity
field [1\,2]. The velocity field is modeled by Kraichnan ensemble [3]: ti
me-decorrelated compressible Gaussian velocity field. The model is studied
by means of field-theoretic approach. Renormalization group (RG) method i
s used in order to analyse asymptotic large-scale behaviour of the model n
ear its critical point and to calculate perturbatively all fixed RG points
and critical exponents in the framework of double-expansion scheme [4\,5]
. We classified possible asymptotic regimes corresponding to infrared stab
le fixed points of the RG equations which have been calculated up to the t
wo-loop approximation.\n\nhttps://indico.jinr.ru/event/137/contributions/6
80/
LOCATION: 310
URL:https://indico.jinr.ru/event/137/contributions/680/
END:VEVENT
BEGIN:VEVENT
SUMMARY:QUASI-VECTOR MODEL OF PROPAGATION OF POLARIZED LIGHT IN A THIN-FIL
M WAVEGUIDE LENS
DTSTART;VALUE=DATE-TIME:20170704T110000Z
DTEND;VALUE=DATE-TIME:20170704T111500Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-681@indico.jinr.ru
DESCRIPTION:Speakers: Dmitriy Divakov (Peoples' Friendship University of R
ussia)\nIn [1]\, a scalar model of the propagation of electromagnetic radi
ation in a thin-film waveguide lens is described. The applicability of the
model to the approximate description of the depolarization process in a t
hin-film waveguide lens is investigated.\nIn this paper\, based on the ide
as underlying the model\, we propose an approximate vector model. The prop
osed model explicitly uses the slow dependence of the Maxwell equations on
the transverse horizontal independent variable y and the rapid dependence
on the two remaining ones x\, z. In Cartesian coordinates related to the
geometry of the regular waveguide on which the thin-film waveguide lens is
based\, taking into account the small parameter of the ratio of slow and
fast variables\, we obtain a system of zero order equations for TE-polariz
ation:\n (1)\nand for TM-polarization:\n (2)\nThe syst
ems (1) and (2) are solved by the incomplete Galerkin method in the standa
rd basis\nwith Maxwell’s system of equations in the first approximatio
n takes the form:\n (3)\n (4)\n
(5)\n (6)\nwith the know
n values of and in the right-hand side\, calculated in the previous st
ep. The systems (3)\, (4) and (5)\, (6) are solved by the incomplete Galer
kin method in the basis\nof [1]. A boundary value problem of the third kin
d for equations (3)\, (4) takes the form:\n \nThe boundary value problem f
or equations (5)\, (6) has an analogous form.\n\nReferences\n1. Malykh
M.D.\, Divakov D.V.\, Sevastianov A.L.\, Sevastianov L.A. Simulation of Po
larized Light Propagation in the Thin-FilmWaveguide Lens // Bulletin of PF
UR. Series: Mathematics. Information Sciences. Physics. Vol. 25\, No. 1. 2
017. Pp. 56-68.\n\nhttps://indico.jinr.ru/event/137/contributions/681/
LOCATION:
URL:https://indico.jinr.ru/event/137/contributions/681/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Simulation of collective excitations in the stack of long Josephso
n junctions
DTSTART;VALUE=DATE-TIME:20170706T130000Z
DTEND;VALUE=DATE-TIME:20170706T131500Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-682@indico.jinr.ru
DESCRIPTION:Speakers: Ilhom Rahmonov (BLTP\, Joint Institute for Nuclear R
esearch)\nWe consider the generalized model of the system of coupled long
JJs[1] which takes into account the inductive and capacitive coupling and
the diffusion current[2\,3]. Numerical investigation of phase dynamics of
long JJs stack is based on the parallel simulation algorithm which provide
s an essential acceleration of simulation procedure[4]. Using the develope
d numerical approach\, we demonstrate a creation of charge travelling wave
in the system of coupled LJJs. Another important result is related to the
demonstration of the coexistence of the charge travelling wave with the s
tandard fluxon mode. This fact indicates an appearance of a new unique col
lective excitation in the system of coupled Josephson junctions\, namely\,
a composite state of the Josephson current\, electric field\, and vortex
magnetic field. We have demonstrated the effect of this collective excitat
ion on the power of the electromagnetic radiation from the stack of long J
Js.\nThis work was funded by RFBR according to the research project 15–2
9–01217\n[1] R. Kleiner\, F. Steinmeyer\, G. KunkelandP. Muller. // P
hys. Rev. Lett. \, V. 68\, 2394 (1992). \n[2] I. R. Rahmonov\, Yu. M. S
hukrinov\, A. Irie // JETP Letters V. 99\, 632 (2014).\n[3] I. R. Rahmo
nov\, Yu. M. Shukrinov\, P. Kh. Atanasova\, E. V. Zemlyanaya\, M. V. Basha
shin\, JETP V124\, 131 (2017).\n[4] I. R. Rahmonov\, Yu. M. Shukrinov\,
A. Plecenik\, E. V. Zemlyanaya and M. V. Bashashin\, EPJ Web of Conferenc
es V108\, 02038 (2016).\n\nhttps://indico.jinr.ru/event/137/contributions/
682/
LOCATION:
URL:https://indico.jinr.ru/event/137/contributions/682/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Ground state of the electron–hole liquid in quantum wells
DTSTART;VALUE=DATE-TIME:20170704T113000Z
DTEND;VALUE=DATE-TIME:20170704T114500Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-683@indico.jinr.ru
DESCRIPTION:Speakers: Alexander Vasilchenko (Kuban State Technological Uni
versity\, Krasnodar\, Russia)\nThe study of the properties of electron-hol
e systems is one of the rapidly developing areas of modern condensed matte
r phys-ics. At present\, most attention is paid to low-dimensional elec-tr
on-hole systems\, in which the role of the Coulomb interaction increases.
Recently\, electron-hole liquid (EHL) was found in SiO2/Si/SiO2 quantum we
lls [1] and in Si/Si1–xGex/Si het-erostructures [2].\nThe aim of this wo
rk is to find the energy and equilibrium density of a quasi-two-dimensiona
l EHL. The ground states of quasi-two-dimensional EHL are studied by the d
ensity func-tional theory. The nonlinear Schrödinger equations for electr
ons and holes are numerically solved. The wave functions and en-ergy level
s of electrons and holes field are found. The binding energy of the electr
on and hole for different surfaces of silicon is calculated. The calculat
ed values of the equilibrium density are in good agreement with the experi
mental values [2].\nThe work was supported by the RFBR and Administration
of the Krasnodar Region (Project No. 16-42-230280).\n\n1. N. Pauc\, V.
Calvo\, J. Eymery\, et al.\, Phys. Rev. B\, 72\, 205325 (2005).\n2. S.N
. Nikolaev\, V.S. Krivobok\, V.S.Baga\, et al.\, Pisma Zh. Exp. Teor. Fiz.
\, 194\, 61 (2016).\n\nhttps://indico.jinr.ru/event/137/contributions/683/
LOCATION: 406A
URL:https://indico.jinr.ru/event/137/contributions/683/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The calculation of multicomponent mixture phase diagram\, using th
e equations of state of the van der Waals type
DTSTART;VALUE=DATE-TIME:20170704T123000Z
DTEND;VALUE=DATE-TIME:20170704T124500Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-686@indico.jinr.ru
DESCRIPTION:Speakers: Dmitry Molchanov (JIHT RAS)\nHydrocarbon mixtures
ﬁltration process simulation development has resulted in use of cubic eq
uations of state of the van der Waals type to describe the thermodynamic p
roperties of natural ﬂuids under real thermobaric conditions [1]. Two- a
nd three-component hydrocarbon systems allow to simulate the ﬂuids of di
ﬀerent types of reservoirs qualitatively\, what makes it possible to car
ry out the experimental study of their ﬁltration features. Exploitation
of gas-condensate reservoirs shows the possibility of existence of various
two-phase ﬁltration regimes\, including self-oscillatory one\, which oc
curs under certain values of mixture composition\, temperature and pressur
e drop [2]. Plotting of the phase diagram of the model mixture is required
to determine these values. A software package to calculate the vapor-liqu
id equilibrium of multicomponent systems using cubic equation of state of
the van der Waals type has been created. Phase diagrams of gas-condensate
model mixtures have been calculated.\n\n1. Brusilovsky A. I. Phase transit
ions in the development of oil and gas reservoirs // Moscow: “Graal”\,
2002\, p. 575.\n2. Kachalov V.V.\, Maikov I.L.\, Molchanov D.A.\, Torchin
sky V.M. Gas condensate reservoirs as the oscillating system of oscillator
type // Gas Science Chronicle\, №2(18)\, 2014\, p. 106–112.\n\nhttps:
//indico.jinr.ru/event/137/contributions/686/
LOCATION: 406A
URL:https://indico.jinr.ru/event/137/contributions/686/
END:VEVENT
BEGIN:VEVENT
SUMMARY:EVOLUTION OF CONTINUUM-ATOMISTIC APPROACH FOR THE MODELING OF IRRA
DIATION OF METALS BY HEAVY IONS
DTSTART;VALUE=DATE-TIME:20170704T104500Z
DTEND;VALUE=DATE-TIME:20170704T110000Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-687@indico.jinr.ru
DESCRIPTION:Speakers: Zarif Sharipov (JINR)\nResearch in the field of mate
rials irradiation by high energy heavy ions (HEHI) has been actively made
for several decades. The experiments in this area are labor-consuming and
expensive. Therefore the improvement of existing mathematical models and t
he development of new ones based on the experimental data of interaction o
f HEHI with materials is of current interest. Currently\, there are used t
wo models for studying these processes: a thermal spike (TS) model [1] and
a method of molecular dynamics (MD) [2]. Combining two these models (cont
inuous-atomistic model (CAM)) will give the opportunity to investigate mor
e thoroughly the processes of irradiation of materials by HEHI.\nThe work
presents the evolution of using the CAM when irradiating metal targets wit
h heavy ions of different energies. The applicability of CAM and the essen
tial points of the model are discussed. A software package has been develo
ped to solve the CAM equations and to test the block of MD of the software
complex on the heterogeneous HybriLIT cluster [4]. The results of modelin
g the processes of interaction of uranium ions with different energies wit
h a nickel target are obtained.\nThe work was financially supported by the
RFBR grant No. 17-01-00661-a and partially supported by a grant of the Pl
enipotentiary Representative of the Republic of Bulgaria at the JINR.\n\nh
ttps://indico.jinr.ru/event/137/contributions/687/
LOCATION:
URL:https://indico.jinr.ru/event/137/contributions/687/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Parallel calculations in optimal control problem
DTSTART;VALUE=DATE-TIME:20170706T134500Z
DTEND;VALUE=DATE-TIME:20170706T140000Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-688@indico.jinr.ru
DESCRIPTION:Speakers: Vasily Dikusar (Dorodnicyn Computing Centre\, FRC CS
C RAS)\nWe consider the problem of choice of angle of attack and bank by a
device which is slowed down in the atmosphere for the flight on the minim
um of maximum heat with constraints on the value of full loading factor. T
he solution of mentioned problems allows to determine maneuver abilities o
f the device. The constraints on full loading factor (control-state constr
aint)\, the lift force coefficient (control)\, constraints on the bank\, t
ypical device area\, the drag force coefficient\, mass\, the boundary cond
itions are parameters. For the solution proposed problem we use two stages
approaches. On the first stage we determine geometry of optimal trajector
y on inequality constraints. Here we solve a non-linear programming proble
m with the help of factor analysis. On the second stage we verify received
solution by the maximum principle in the form of Dubovitsky-Milyutin. For
all proposed algorithms we use parallel calculations.\n\nhttps://indico.j
inr.ru/event/137/contributions/688/
LOCATION:
URL:https://indico.jinr.ru/event/137/contributions/688/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Nonlinear spinor field in non-diagonal Bianchi type space-time
DTSTART;VALUE=DATE-TIME:20170703T110000Z
DTEND;VALUE=DATE-TIME:20170703T111500Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-689@indico.jinr.ru
DESCRIPTION:Speakers: Bijan Saha (Laboratory of Information Technologies\,
Joint Institute for Nuclear Research)\nWithin the scope of non-diagonal
Bianchi cosmological models we have\nstudied the role of spinor field in t
he evolution of the Universe.\nUnlike in diagonal Bianchi models such as I
\, III\, V\, VI0 \nand VI where spinor field distribution along the main a
xis is\nisotropic and becomes zero for linear spinor field\, in case\n(non
-diagonal) Bianchi models such as II\, VIII and IX\, spinor\nfield distrib
ution along the main axis is anisotropic and does not\nvanish in absence o
f spinor field nonlinearity. The equation for\nvolume scale V in case of d
iagonal Bianchi models can be resolved\nexactly and the corresponding solu
tion can be presented as\nquadrature. In case of non-diagonal Bianchi mode
ls the corresponding\nequation contains a term with the firs derivative of
V explicitly and does not allow\nexact solution in quadrature.\n\nIn abse
nce of non-diagonal components of energy-momentum tensor non-diagonal Bian
chi spacetime becomes locally rotationally symmetric.\nInclusion of spinor
field does not change the situation as well.\n\nIt was found that dependi
ng on the sign of coupling constant the\nmodel allows either an open Unive
rse that rapidly grows up or a\nclose Universe that ends in Big Crunch sin
gularity.\n\nhttps://indico.jinr.ru/event/137/contributions/689/
LOCATION: 310
URL:https://indico.jinr.ru/event/137/contributions/689/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Diffraction of electromagnetic waves on a waveguide joint
DTSTART;VALUE=DATE-TIME:20170707T101500Z
DTEND;VALUE=DATE-TIME:20170707T103000Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-690@indico.jinr.ru
DESCRIPTION:Speakers: Mikhail Malykh (RUDN University)\nConsider a wavegui
de of a constant simply connected cross-section $S$ with ideally conductin
g walls. The axis $Oz$ is directed along the cylinder axis\, the normal to
$\\partial S$ will be denoted as $\\vec n$\, the tangent vector perpendic
ular to $\\vec e_z$ as $\\vec \\tau$. Let the filling $\\epsilon$\, $\\mu$
of this waveguide have the jump at $z=0$ so this plane is the joint of tw
o waveguide. For a while we will not make any assumptions about the depend
ence $\\epsilon$\, $\\mu$ on $x\,y$. \n\nFor a basis we take the system o
f Maxwell's equations\, from which we exclude $E_z$ and $H_z$. A two-dimen
sional analogue of the Helmholtz decomposition makes it possible\, without
loss of generality\, to seek a solution in the form\n\\[\n\\vec E_\\perp
= \\nabla u_e +\\nabla' v_e\, \\quad\n\\vec H_\\perp = \\nabla v_h +\\nabl
a' u_h\,\n\\]\nwhere\n\\[\n\\nabla = (\\partial_x\, \\partial_y)^T\, \\qua
d \\nabla' = (-\\partial_y\, \\partial_x)^T.\n\\]\nThe four scalar functio
ns introduced here will be called potentials\, and we'll always assume tha
t they satisfy the boundary conditions\n\\[\nu_e=u_h = n \\cdot \\nabla v_
e = n \\cdot \\nabla v_h =0.\n\\]\nThe boundary conditions for the field a
re automatically satisfied and Maxwell's equations give a system of four
equations on the potentials. The solution of this system we consider as fu
nctions of variable $z$ with values in appropriate Sobolev spaces. Thus Ma
xwell's equations give for vector $w =(u_e\,u_h\,v_e\,v_h)$ the ordinary d
ifferential equation\n\\[\nB \\frac{dw}{dz} + ik Aw -\\frac{1}{ik} Cw=0\,\
n\\]\nwhere $A\,B\,C$ are bounded operators. Any solution of this equation
at $z<0$ and at $z>0$ can be represented as the superposition of normal m
odes with respect to the eigenvalue problem \n\\[\n\\beta B w = A w + \\f
rac{1}{k^2} C w\, \n\\]\nso the solving of diffraction problem is reduced
to the matching of both solutions. \n\nIn our talk we want to show how to
calculate the eigenmodes and to make the matching in Sage partially by the
analytic way.\n\nhttps://indico.jinr.ru/event/137/contributions/690/
LOCATION: 310
URL:https://indico.jinr.ru/event/137/contributions/690/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Finite difference schemes as algebraic correspondences between lay
ers
DTSTART;VALUE=DATE-TIME:20170707T100000Z
DTEND;VALUE=DATE-TIME:20170707T101500Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-691@indico.jinr.ru
DESCRIPTION:Speakers: Mikhail Malykh (RUDN University)\nModern development
of computer science revived the old investigations about the solvability
of differential equations in the finite terms. There are remarkable differ
ential equations which can be integrated in CAS. In our work we want to sp
eak about remarkable differential equations in another sense: for these eq
uations there are finite difference schemes which conserve algebraic prope
rties of solutions exactly. It should be noted that these classes of diffe
rential equations are very similar. \n\nAs was shown by Painlev\\'e\, all
ordinary differential equations which can be integrated in classical tran
scendental functions have a common algebraic property\, namely\, general
solution of such differential equation depends on integration constant alg
ebraically. So we can construct a version of Galois theory without fixatio
n of allowed transcendental operations [1\,2].\n\nIn term of Cauchy proble
m this property means that the differential equation defines an algebraic
correspondence between initial and terminal values. For example Riccati eq
uation $y' = p(x)y^2 + q(x)y + r(x)$ defines one-to-one correspondence bet
ween initial and terminal values of $y$ on projective straight line. Howev
er\, standard finite difference scheme don't conserve this algebraic prope
rty of exact solution. Further more\, the scheme\, which defines one-to-on
e correspondence between layers\, truly describes solution not only befor
e but also after mobile singularities and conserves algebraic properties o
f equations like the anharmonic ratio [3]. \n\nWhen the differential equat
ion has a form $F(x\,y\,y')=0$ we reduce it to equation of 2nd degree and
then apply the finite difference method. In so doing\, the expression $F(
x\,y\,y')$ is the integral of the differential equation of 2nd degree and
thus its quantity is conserved on approximate equation only with some smal
l error. However if the equation $F(x\,y\,y')=0$ defines one-to-one corres
pondence between initial and terminal values we can try to find the differ
ence scheme which define one-to-one correspondence between layers\, that i
s between algebraic curves. For curves with the genus $p>0$ such correspon
dence can be constructed by pure algebraic way and at the same time perio
dical functions appear here naturally without any references on exact solu
tion. In our talk such schemes will be presented.\n\nhttps://indico.jinr.r
u/event/137/contributions/691/
LOCATION: 310
URL:https://indico.jinr.ru/event/137/contributions/691/
END:VEVENT
BEGIN:VEVENT
SUMMARY:A NEW APPROACH TO WEIGHT MULTIPLICITY IN REPRESENTATIONS OF COMPAC
T LIE GROUPS
DTSTART;VALUE=DATE-TIME:20170707T094500Z
DTEND;VALUE=DATE-TIME:20170707T100000Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-692@indico.jinr.ru
DESCRIPTION:Speakers: Anatoli Loutsiouk (Department of Civil Engineering\,
King Mongkut University of Technology Thonburi\, Thailand)\nThe multipli
city of a weight of an irreducible finite-dimensional representation of a
complex semisimple Lie algebra can in principle be evaluated by using the
celebrated Kostant multiplicity formula\, which employs summation of valu
es of Kostant partition function over the Weyl group of the algebra. While
Kostant’s formula is quite elegant\, it is usually not suitable for com
putations due to the size of the Weyl group. From the computational point
of view\, storing all data about the Weyl group consumes an enormous amoun
t of space. In practice\, computer methods based on the recursive method o
f Freudenthal are usually implemented. Another inductive formula is that o
f Racah\, which also uses summation over the Weyl group. The new direct a
pproach to weight multiplicity suggests a method for computing the weight
multiplicity that does not use summation over the Weyl group and is not re
cursive. The method is based on localized partition functions.\n\nhttps://
indico.jinr.ru/event/137/contributions/692/
LOCATION: 310
URL:https://indico.jinr.ru/event/137/contributions/692/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Methods of investigation of equations that describe waves in tubes
with elastic walls and application of the theory of reversible and weak d
issipative shocks
DTSTART;VALUE=DATE-TIME:20170703T124500Z
DTEND;VALUE=DATE-TIME:20170703T130000Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-693@indico.jinr.ru
DESCRIPTION:Speakers: Igor Bakholdin (Keldysh Institute for Applied Mathem
atics)\nDifferent models of tube with hyper elastic walls are investigated
. They are tube with controlled pressure\, tube filled by incompressible
fluid\, tube filled by compressible gas. Complete membrane model and non-l
inear hyper elastic model are used for walls of tube. Linear model of plat
e is used in order to take bending resistance of walls into account. Equat
ions are solved numerically. Walls of the tube are treated as incompressib
le. Compressibility of material of walls and viscosity of material and gas
of fluid may be taken into account. Simplified hyperbolic equations and
Boussinesq-type equations are derived. Stability of solitary waves for the
case of controlled pressure is investigated. Analysis of solutions of Rie
mann problem is made for all models. It is opened that in all cases typica
l non-dissipative shock structures are predicted by the theory of reversib
le and weak dissipative shocks. Three-layer centered time and space revers
ible numerical scheme and similar two-layer space reversible numerical sch
eme with approximation of time derivatives by Runge-Kutta method are used.
It is opened that in the case controlled pressure both methods gives good
results. But in the case of fluid-filled and gas-filled tube numerical ed
ge instability appears. Numerical scheme based on Runge-Kutta method was
used in these cases. It was opened that this scheme possesses non-correct
scheme dissipation. Increase of disturbances is observed for long-time cal
culations. It was opened that there are no such increase if predictor-corr
ector method with predictor for complete time step is used. In the case of
Runge-Kutta method predictor is calculated for half of time step. Hence t
he same program may be used. But this method is method of first order appr
oximation. It possesses essential numerical viscosity. Non-dissipative sh
ocks become weak dissipative shocks if this method is used. Method of corr
ection of numerical schemes by inclusion of terms with high-order derivati
ves was developed. Order of approximation of numerical scheme is not chang
ed. Good results for tubes filled by inviscid fluid and gas were obtained.
It seems that such approach may be used in all cases of models with evol
utional equations. Result of the investigation is a step to development of
general approach of calculations of equations with dispersion. This work
is supported by Russian Fund for Basic Research\, grant 15-01-04357a.\n\nh
ttps://indico.jinr.ru/event/137/contributions/693/
LOCATION: LIT Conference Hall
URL:https://indico.jinr.ru/event/137/contributions/693/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Numerical damping of oscillations of beams by using multiple point
actuators
DTSTART;VALUE=DATE-TIME:20170703T123000Z
DTEND;VALUE=DATE-TIME:20170703T124500Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-694@indico.jinr.ru
DESCRIPTION:Speakers: Nikolay Taran (Moscow Aviation Institute)\nThe beams
are typical elements of complex mechanical systems. Vibrations of beams a
re modeled by initial boundary problems for the forth order partial differ
ential equation\, where initial conditions are considered as non-desirable
perturbations and right parts of the equation as a control function. In t
his report we investigate the possibility of numerical damping non-desirab
le vibrations for minimal time t = T by using multiple point actuators. Gi
ven examples for numerical solutions obtained with one and multiple point
actuators showing process of damping oscillations of a beam.\n\nhttps://in
dico.jinr.ru/event/137/contributions/694/
LOCATION: LIT Conference Hall
URL:https://indico.jinr.ru/event/137/contributions/694/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Finite-difference splitting scheme for three-dimensional Schroedi
nger equation\, describing tunneling from anharmonic atomic traps
DTSTART;VALUE=DATE-TIME:20170703T123000Z
DTEND;VALUE=DATE-TIME:20170703T124500Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-695@indico.jinr.ru
DESCRIPTION:Speakers: Ilyas Ishmukhamedov (BLTP\, JINR/KazNU)\nWe present
an efficient computational scheme to integrate the time-dependent three-di
mensional Schroedinger equation. The time-evolution operator is calculated
with a second order split-operator technique and spatial derivatives are
approximated with a sixth-order finite-difference method.\n\nThe efficienc
y of our implicit scheme is demonstrated in comparison with a high-order d
irect method [1] for an exactly solvable problem of a harmonic oscillator.
\n\nOur method was successfully applied to a tunneling problem of two inte
racting atoms confined in a one-dimensional optical trap by "walls" of an
anharmonic potential [2]. By computing a time-evolution of a population of
the trap states we extract tunneling rates of the atoms [2].\n\nBy using
the above examples\, we demonstrate a linear dependence of a computational
time of the method on a number of spatial grid points and a fast converge
nce with respect to a step of integration over time and spatial variables.
The computational method can be extended to more complicated problems in
higher dimensions.\n\nhttps://indico.jinr.ru/event/137/contributions/695/
LOCATION: 406A
URL:https://indico.jinr.ru/event/137/contributions/695/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Development of swarm optimization methods for the structural bioin
formatics problems on the basis of the model problem of graph drawing
DTSTART;VALUE=DATE-TIME:20170703T140000Z
DTEND;VALUE=DATE-TIME:20170703T143000Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-696@indico.jinr.ru
DESCRIPTION:Speakers: Maxim Bystrov (Dubna State University)\nOur research
is related to the problems of predicting the spatial structure of polypep
tide molecules and their complexes. Our approach is based on the solution
of the corresponding optimization problem\, in which the objective functio
n is the potential energy of the corresponding atomic ensemble\, and the p
arameters of optimization are such geometric characteristics as bond lengt
hs\, valence and torsion angles. Distinctive features of this kind of opti
mization tasks are their high dimension and a long calculation time of the
objective function\, which determines the high requirements to the speed
of convergence of the optimization algorithm. Our preliminary studies have
shown that the absolute majority of existing optimization algorithms solv
e this task very badly. The development of new algorithms (or optimization
of existing ones) is obstructed by the high computational complexity of t
he problem itself - typical calculation time is measured in hours and even
days. In addition\, the calculation of the objective function (energy) re
quires the installation of very serious software. For these reasons\, we p
roposed to use the simpler related problem of graphs drawing to develop ne
w optimization algorithms. The results of numerical investigation of sever
al classical algorithms of swarm and evolutionary optimization are present
ed on the solution of such a model problem.\n\nhttps://indico.jinr.ru/even
t/137/contributions/696/
LOCATION:
URL:https://indico.jinr.ru/event/137/contributions/696/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Modeling hysteretic effects in perovskite solar cells
DTSTART;VALUE=DATE-TIME:20170706T104500Z
DTEND;VALUE=DATE-TIME:20170706T110000Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-697@indico.jinr.ru
DESCRIPTION:Speakers: George Alexandru Nemnes (Horia Hulubei National Inst
itute for Physics and Nuclear Engineering\, 077126\, Magurele-Ilfov\, Roma
nia \; University of Bucharest\, Faculty of Physics\, MDEO Research Center
\, 077125 Magurele-Ilfov\, Romania)\nDynamic J-V hysteretic effects [1] ar
e consistently described by the dynamic electrical model (DEM) introduced
in Ref. [2]. DEM explains the dependence of the hysteresis amplitude and s
hort circuit current on the bias scan rate. It also reproduces the current
overshoot experimentally observed in the reverse characteristics and its
dependence on bias pre-poling. The basic assumption is that the rather slo
w ion migration process (typically in the order of seconds) governing the
time evolution of the polarization charge is described in the single relax
ation time approximation\, however the steady state polarization charge be
ing a bias dependent quantity. Using DEM we obtain the time dependent solu
tion of the coupled differential equations that govern the dynamic J-V cha
racteristics. Furthermore\, analytical extensions are considered.\n
We investigate here the dynamic J-V characteristics of perovskite solar c
ells obtained by successive spin-coating deposition of TiO2 thin and meso-
porous layers\, CH3NH3PbI3−xClx mixed halide perovskite and spiro-OMeTAD
on comercial glass/FTO substrate\, with Au electrodes [3]. We report the
occurrence of normal hysteresis (NH) and inverted hysteresis (IH) in the J
-V characteristics in the same device structure\, the behavior strictly de
pending on the pre-poling bias (Vpol). \n Using a three step measuremen
t protocol\, which includes the stabilization of the open circuit bias (Vo
c)\, bias pre-poling at Vpol for a time interval tpol\, followed by a re
verse-forward scan starting from Voc as actual measurement\, we introduce
a unified description of the dynamic hysteresis\, which can be tuned from
NH (Vpol>Voc) to IH (Vpol<0) [4]. We also analyze comparatively reverse-fo
rward and forward-reverse scans\, with different pre-poling conditions. In
this context we discuss the conditions for a correct evaluation of the so
lar cell power conversion efficiency (PCE). \n\nReferences:\n[1] H. J. Sn
aith\, A. Abate\, J. M. Ball et al.\, J. Phys. Chem. Lett. 5\, 1511 (2014)
.\n[2] G.A. Nemnes\, C. Besleaga\, A.G. Tomulescu et al.\, Sol. Energy Mat
er. Sol. Cells 159\, 197 (2017).\n[3] C. Besleaga\, L.E. Abramiuc\, Vioric
a Stancu et al.\, J. Phys. Chem. Lett. 7\, 5168 (2016).\n[4] G.A. Nemnes\,
C. Besleaga\, Viorica Stancu et al.\, J. Phys. Chem. C\, DOI: 10.1021/acs
.jpcc.7b04248 (2017).\n\nhttps://indico.jinr.ru/event/137/contributions/69
7/
LOCATION: 310
URL:https://indico.jinr.ru/event/137/contributions/697/
END:VEVENT
BEGIN:VEVENT
SUMMARY:On stratifications of X-state space of two qubits
DTSTART;VALUE=DATE-TIME:20170706T124500Z
DTEND;VALUE=DATE-TIME:20170706T130000Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-698@indico.jinr.ru
DESCRIPTION:Speakers: Astghik Torosyan (LTP)\nWe are considering the state
space of two qubits formed from the X-states. Its decompositions with res
pect to two groups actions are studied. The first decomposition is constr
ucted in accordance with the types of orbits of the invariance group G_X o
f X-state space. The second decomposition arises considering the action of
the subgroup LG_X of invariance group G_X\, the so-called “local group
of invariance” of X-states\, every element of which is given by the tens
or product of mutually independent unitary transformations acting on each
qubit. The equations and inequalities\, determining all components of both
stratifications\, are given in terms of the corresponding group invariant
s.\nThe primary stratification classifies the X-state space in accordance
with the properties of two-qubit system as a whole\, while the secondary s
tratification provides complete information on non-local characteristics o
f the given composite system.\n\nhttps://indico.jinr.ru/event/137/contribu
tions/698/
LOCATION: LIT Conference Hall
URL:https://indico.jinr.ru/event/137/contributions/698/
END:VEVENT
BEGIN:VEVENT
SUMMARY:High precision computer simulation of cyclotrons
DTSTART;VALUE=DATE-TIME:20170704T123000Z
DTEND;VALUE=DATE-TIME:20170704T124500Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-699@indico.jinr.ru
DESCRIPTION:Speakers: Dmitriy Popov (JINR)\, Taisia Karamysheva (JINR)\, V
ladimir Malinin (JINR)\nEffective and accurate computer simulations are hi
ghly important in accelerators design and production. The most difficult a
nd important task in cyclotron development is the magnetic field simulatio
ns. It is necessary to achieve the accuracy of the model that is higher th
an the tolerance for the magnetic field in the real magnet. An accurate mo
del of the magnet and other systems of the cyclotron allows us to perform
beam tracking through the whole accelerator from the ion source to the ext
raction. While high accuracy is necessary in the late stages of R&D works\
, high performance of the simulations and ability to swiftly analyze and a
pply changes to the project plays the key role in the early stages of the
project. Techniques and algorithms for high accuracy and performance of th
e magnet simulations have been created and used for development of the SC2
02 cyclotron for proton therapy\, which is under production by collaborati
on between JINR (Dubna\, Russia) and ASIPP (Hefei\, China).\n\nhttps://ind
ico.jinr.ru/event/137/contributions/699/
LOCATION: 310
URL:https://indico.jinr.ru/event/137/contributions/699/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Modeling of Static Electric Field Effect on Nematic Liquid Crystal
Director Orientation in Side-Electrode Cell
DTSTART;VALUE=DATE-TIME:20170703T133000Z
DTEND;VALUE=DATE-TIME:20170703T134500Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-700@indico.jinr.ru
DESCRIPTION:Speakers: Aleksandr Egorov (A.M. Prokhorov General Physics Ins
titute\, Russian Academy of Sciences)\nTwo-dimensional model of Fredericks
effect was used for the investigation of the static electric field influe
nce on nematic liquid crystal director orientation in the side–electrode
cell. The solutions were obtained by finite-difference methods. The progr
ams for numerical solution of two-dimensional parabolic partial differenti
al equation were developed by using both FORTRAN and C++. Fredericks trans
ition threshold for the central part of the cell\, as well as dependencies
of the distribution of the director orientation patterns on the electric
field and location were obtained. The results of the calculation were comp
ared to the experiment.\n\nhttps://indico.jinr.ru/event/137/contributions/
700/
LOCATION: LIT Conference Hall
URL:https://indico.jinr.ru/event/137/contributions/700/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Quantum correlations in bipartite systems
DTSTART;VALUE=DATE-TIME:20170706T053000Z
DTEND;VALUE=DATE-TIME:20170706T060000Z
DTSTAMP;VALUE=DATE-TIME:20201201T051750Z
UID:indico-contribution-137-701@indico.jinr.ru
DESCRIPTION:Speakers: Edward Fel'dman (Institute of Problems of Chemical P
hysics of RAS)\nQuantum correlations are different from all other correlat
ions in many-particle systems. They depend on measurements. Quantum correl
ations are responsible for the advantages of quantum devices over their cl
assical counterparts and ensure efficient work of all quantum devices\, in
cluding quantum computers. Entanglement is a measure of quantum correlatio
ns for pure states. According to the current understanding\, total correl
ations\, classical and quantum\, can be described by the mutual quantum i
nformation [1\, 2]. In order to separate quantum and classical correlation
s\, one should perform a total system of projective measurements over one
of the subsystems of a bipartite system [1\, 2]. As a result of those meas
urements\, at least a part of quantum correlations disappears. Performing
minimization of the quantum conditional entropy over all possible total se
ts of projective measurements\, one can annihilate all quantum correlatio
ns and separate the contributions of classical and quantum correlations to
the mutual quantum information. The contribution of quantum correlations
to the mutual quantum information is called quantum discord [1]. \n The
calculation of quantum discord is a very difficult problem because it req
uires complex optimization. The problem can be solved in general bipartite
systems only with numerical methods. We consider here some cases where qu
antum discord can be found analytically [3\,4].\n First we consider qua
ntum correlations in a bipartite heteronuclear (N-1)х1 system in an exter
nal magnetic field. The system consists of a spin ring with an arbitrary n
umber N-1 of spins on the ring and one spin in its center [3]. The spins o
n the ring are connected by the secular dipole-dipole interaction (DDI) an
d interact with the central spin through the Heisenberg zz-interaction. We
show that quantum discord can be obtained analytically in the high-temper
ature approximation. The model allows us to find contributions of differen
t parts of the spin-spin interactions to quantum correlations [3].\n W
e investigate also [4] quantum correlations in a two-spin system with the
DDI in NMR multiple-pulse spin locking experiments [5]. We demonstrate tha
t quantum correlations are absent in the multiple-pulse spin-locking with
π/2-radio-frequency pulses even at long times. At the same time\, entang
lement emerges after several periods of the pulse sequence with π/4-radio
-frequency pulses. We demonstrate the dependence of entanglement on the nu
mber of periods of the multiple-pulse sequence. Quantum discord is obtaine
d for the multiple-spin-locking experiment at different temperatures [6].\
n The work is supported by Russian Foundation of Basic Research (Grant
No. 16-03-00056) and the Program of the Presidium of RAS “Element base
of quantum computers” (Grants No. 0089-2015-0220).\n\n1.H.Ollivier\, W.H
.Zurek\, Phys.Rev.Lett. 88\, 017901 (2001).\n2.L.Henderson\, V.Vedral\, J.
Phys.A: Math-Gen.34\, 6899 (2001).\n3.S.I.Doronin\, E.B.Fel’dman\, E.I.K
uznetsova\, Quant. Inf.Process.14\, 2929 (2015).\n4.E.B.Fel’dman\, D.E.F
eldman\, E.I.Kuznetsova\, Appl. Magn.Reson.48\, 516 (2017).\n5.M.Goldman\,
Spin temperature and Nuclear Magnetic Resonance in Solids\, Clarendon Pres
s\, Oxford\, 1970.\n6.S.A.Gerasev\, A.V.Fedorova\, E.B.Fel’dman\, E.I.Ku
znetsova\, Quant. Inf. Process.\, in press.\n\nhttps://indico.jinr.ru/even
t/137/contributions/701/
LOCATION: LIT Conference Hall
URL:https://indico.jinr.ru/event/137/contributions/701/
END:VEVENT
END:VCALENDAR