|Archive of LIT Seminars (2009)|
|December 24, 2009, at 15.00, ( LIT, r. 310 ) the seminar LIT will be held:|
| O.I. Yuldashev: "Projection - mesh methods for solving
nonlinear elliptic problems with differential operators of vector analysis"|
(materials of a Doctor's thesis)
|December 18, 2009, at 15.00, ( LIT, r. 310 ) the seminar LIT will be held:|
H.A. SARKISYAN, K.G. Dvoyan, E.M. Kazaryan, L.S. Petrosyan,
S.I. Vinitsky, A.A. Gusev, O. Chuluunbaatar,
V.L. Derbov, V.V. Serov: "Analysis of semiconductor quantum-dimensional
nanostructure models using adiabatic approach"
Models of semiconductor quantum nanostructures and their basic spectral characteristics are
considered. The adiabatic approach based on the approximate separation of fast and slow
variables, is related to the Kantorovich method providing the reduction of a multidimensional
wave problem to a set of ordinary differential equations. Adiabatic description of models of
electronic and Coulomb systems in quantum dots, quantum wires and quantum wells
nanostructures is presented. The application of adiabatic approach and Kantorovich method to
boundary problems with elliptic equations is illustrated. The prospects of development and
application of the method are outlined.
|December 22, 2009, at 15.00, ( LIT, r. 310 ) the seminar LIT will be held:|
| 1. Lebedev Semeon: "Ring recognition and electron identification
algorithms for the RICH detector in the CBM experiment at FAIR"
2. Lebedev Andrey: "Algorithms for glodal track reconstruction
in the CBM experiment at FAIR"
|December 17, 2009, at 15.00, ( LIT, r. 310 ) the seminar LIT will be held:|
| Z.A. Sharipov: "Mathematical simulations of thermal
processes in materials exposed to high-energy heavy ions"|
(materials of a PhD thesis)
|December 3, 2009, at 15.00, ( LIT, r. 310 ) the seminar LIT will be held:|
D.D. Ahmedov, R.K. Bazarov (Institute of mathematics and information technologies National Academy of Science Uzbekistan): "Experience educational Grid-infrastructure
creations in IMIT NAS RUz"
With support of our colleagues from JINR (LIT) has been created local grid-site in IMIT
NAS RUz, that has been included in virtual organization EDU. It was created VO IMIT
and own certification centre. Installed services are: UI, CA, VOMS, WMS, LB, CE
(support MPI, with shared directory /home), top-BDII, BDII-sites, WN (mpi). Grid –site
was tested by the algorithm of Needleman-Wunsch, which is known from bioinformatics
as procedure for an estimation of similarity of two set sequences of symbols.
|November 12, 2009, at 15.00, ( LIT, r. 310 ) the seminar LIT will be held:|
V.M. Voronyuk, V.M. DUBOVIK, E.N. Dubovik: "Generalized evolution equation for potentials created by higher polarizabilities"
In frames of our generalized electromagnetism (V.M. Voronyuk,V.M. Dubovik, B. Saha, 2001, further E.N. Dubovik, 2005), an equation has been derived for potentials of the n-order that are created by
higher polarizations and polarizabilities. The equations contain higher derivatives on time and spatial
coordinates and have a complex symmetry. The numerical simulation of the dynamic effects created
by these potentials, is important for creating advanced technologies from a macroscopic level to an
atomic one. An equation of the third order similar to ours, has been found earlier by A.F. Andreev at
linearization of the Young-Mills equations.
|October 23, 2009, at 15.00, ( LIT conference hall ) the seminar LIT will be held:|
1. A.L. Golovinsky (V.N.Glushkov Institute of Cybernetics, National
Academy of Sciences, Ukraine): "Architecture of the SKIT supercomputer, ways of applying high-
performance systems for nuclear research data processing centres"
2. E. Perepelkin: "CUDA applications for some physics problems"
|October 22, 2009, at 15.00, ( LIT, r. 310 ) the seminar LIT will be held:|
V. SMIRNOV, E. Perepelkin, A. Povolotsky: "Modeling of stochastic cellular automata using CUDA technology"
We perform Monte-Carlo simulations of the Asymmetric Simple Exclusion Process. Simulations of stochastic cellular automata of this type are known to be very time consuming problem. In practice, they deal with systems with many degrees of freedom, which evolve with a sequence of operations of
similar nature. To increase the efficiency of calculations one can use parallel programming methods.
We present the simulations realized with the Graphic Processors (NVIDIA TESLA C1060). The use
of this approach significantly accelerates calculations, which in turn allows for applications to highly
|September 18, 2009, at 15.00, ( LIT, r. 310 ) the seminar LIT will be held:|
Daniel Zablocki (Institute for Physics, University of Rostock,
Rostock, Germany): "Mesons and diquarks in the NJL model: Chiral symmetry and superfluidity"
The relationship between mesonic correlations and quantum condensates in the
quark matter phase diagram of quantum chromodynamics (QCD) with two colors
and two flavors of light quarks is explored within a quantum field theoretical
approach of the Nambu and Jona-Lasinio (NJL) type. This is motivated by the
increasing interest in the QCD phase diagram as follows: (1) The QCD critical point
search has been under intensive dispute. (2) A new phase called quarkyonic matter is
drawing theoretical and experimental attention but it is not clear whether it can
coexist with diquark condensation. We point out that two-color QCD is nontrivial
enough to contain essential ingredients for (1) and (2), in its PNJL extension, both,
and most importantly, is a system without the sign problem in numerical simulations
on the lattice. Mean-field values in the scalar meson and diquark channels are order
parameters signaling the occurrence of quark condensates, entailing chiral symmetry
breaking ( SB) and color superconductivity (2SC) in quark matter. We investigate the
spectral properties of scalar and pseudoscalar meson excitations in the phase
in Gaussian approximation. We discuss the influence of mixing between the and
diquarks which was omitted so far in the literature..
|September 3, 2009, at 15.00, ( LIT, r. 310 ) the seminar LIT will be held:|
E. Jurčišinova: "Methods of Investigation of Mathematical Models of fully developed turbulence"
A method for investigation of the influence of breaking of isotropic symmetry on the existence of scaling regimes in models of developed turbulence in different approximations with respect to
interaction is worked out. Theoretical investigation of the method is done and the algorithms for its realization are constructed and investigated. The algorithms are realized in the form of computer programs and they are used in numerical experiments. The analysis of the results of the numerical experiments has allowed to make variety of conclusions about the existence of scaling regimes in anisotropic models of developed turbulence: for uniaxial anisotropy at the first order of approximation and for helicity at the second order of approximation.
|July 30, 2009, at 15.00, ( LIT, r. 310 ) the seminar LIT will be held:|
1. E. Jurčišinova: "Numerical solution of Gell-Mann-Low
differential Equations in anisotropic model of developed turbulence"
Using the field-theoretic renormalization group technique in theory of developed turbulence
based on the stochastic Navier-Stokes equation the influence of uniaxial anisotropy on the
stability of the Kolmogorov regime is analyzed by numerical solution of the Gell-Mann-Low
differential equations. The stability of the Kolmogorov regime is driven by properties of the
solution of the system of strongly nonlinear differential equations which contain integrals.
The analysis of the convergence of integrals is given and possible ways of their solution are
discussed. Numerical analysis of the differential equations is given. As a result, the so-called
borderline dimension below which the Kolmogorov regime becomes unstable is found as
function of anisotropy parameters.
2. H.A. Sarkisyan, K.G. Dvoyan, E.M. Kazaryan, L.S. Petrosyan (Russian-Armenian (Slavonic) University, Yerevan, Armenia),
S.I. Vinitsky, A.A. Gusev, O. Chuluunbaatar (JINR): "Adiabatic description of electronic and Coulomb systems
in quantum nanostructures"
In the present review on the base of adiabatic approximation, results of research of electronic and Coulomb states in quantum nanostructures with various geometry (spherical, cylindrical, ellpsoidal, lynse-like, layered) are presented. Consideration is given in both at presence, and absence of the external fields, supposing representation of Hamiltonians of corresponding systems as the sum of Hamiltonians of slow and fast subsystems. The scheme of solution of an elliptic boundary-value problem with axial symmetry, by means of the Kantorovich method for quasi-two-dimensional impurity states in quantum wells with parabolic and rectangular inpenetrable confining potentials is presented.
|July 22, 2009, at 15.00 ( LIT Conference Hall ) the seminar LIT will be held:|
И.Б. Соловьёв (ЦЕРН, Женева - ПИЯФ, Гатчина): "Эволюция контроля и конфигурирования
системы сбора и обработки данных эксперимента АТЛАС (ЦЕРН)"
Доклад содержит обзор программного комплекса, используемого для реализации контроля и конфигурирования эксперимента АТЛАС, созданного группой системы сбора и обработки данных. Будет представлено, как этот комплекс был спроектирован, реализован, установлен на рабочей площадке эксперимента и используется в настоящее время. Особое внимание будет уделено новым требованиям и связанным с ними проблемам, появившимся после окончательного технического задания, сформулированного в 2004 году,
что включает в себя:
- Аудит, т.е. возможность анализа процессов, происходящих во время сборки данных, возможность их воспроизведения из архивов, анализ условий и ошибок.
- Безопасность - идентификация пользователей и ограничение управления доступом на основе ролей пользователей.
- Масштабируемость и производительность системы, учитывая беспрецедентные размеры системы, включающей порядка 50-ти тысяч
взаимосвязанных процессов, запущенных на 3-х тысячах компьютеров.
- Устойчивость к ошибкам и восстановление после ошибок, основанные на использовании экспертных систем.
- Удобство и корректность использования систем контроля и конфигурирования не только экспертами, разработка интерфейсов для
|July 16, 2009, at 10.30 ( LIT Conference Hall ) the seminar LIT will be held:|
| "Эффективное внедрение Autodesk Inventor в ОИЯИ. Особенности проектирования"|
Programme of the seminar - presentation:
1. Использование Autodesk Inventor для проектирования различных задач (опыт специалистов ОИЯИ);
2. Внедрение Autodesk Inventor на других предприятиях страны. Примеры.(RGP, Autodesk);
3. Выработка эффективных схем внедрения Autodesk Inventor в ОИЯИ; (ОИЯИ, RGP, Autodesk);
4. Разработка плана внедрения (обучение специалистов, выполнение совместного 'пилотного' проекта и пр.,);
5. Анализ программных сред для проектирования аналогичных задач.(RGP, Autodesk).
|July 2, 2009, at 10.30 ( LIT Conference Hall ) the seminar LIT will be held:|
| "SIEMENS PLM Software RU 'CAD and PLM technologies'"|
Programme of the seminar - presentation:
1. CAD Solid Edge with synchronous technology.
2. Tool of reverse engineering Femap - CAE solution.
3. Teamcenter solution of joint control over engineering data.
|July 2, 2009, at 15.00, ( LIT, r. 310 ) the seminar LIT will be held:|
1. E. Jurčišinova: "Construction of n-loop Feуnman diagrams in field-theoretic models of fully developed turbulence"
An effective approach for construction of all n-loop one-irreducible two-
point Feynman diagrams for theories with triple interaction vertices is
introduced and discussed. The method is based purely on the graph theory
approach and the completeness and uniqueness of the solution of the
problem is proven. The corresponding algorithms for the theory are
constructed and used. The general theory is applied to the field-theoretic
model of fully developed turbulence based on the stochastic Navier-Stokes
equation. The obtained results are discussed and their relevance for further
analysis of the model is briefly described.
2. Ivan G. Hristov, Stefka N. DIMOVA, Todor L. Boyadjiev: "Critical Dependencies in Three-lavered Josephson Junctions"
The dynamics of the Josephson phases in stacked long Josephson Junctions is
described by Sakai-Bodin-Pedersen model . Partial critical dependencies of the
kind current-magnetic field for three-layered Josephson Junctions are numerically
investigated by using this model. Numerical procedure for finding the critical
currents of the individual junctions for fixed parameters is proposed and realized. A
correspondence between switching to nonzero voltage of the system and the loss of
stability of some static solutions is found. For this reason the static problem is
numerically investigated as well . In order to study the stability of possible static
distributions a Sturm-Liouville problem is generated  and solved. Critical
currents for individual junctions are found for different values of the damping and
coupling parameters at low magnetic field. We show that the individual critical
currents depend on these parameters and that there is a domain in vicinity of zero
magnetic field where the junctions switch to nonzero voltage simultaneously.
 S. Sakai, P. Bodin, N.F. Pedersen, Fluxons in thin-film superconductor-insulator su-
perlattices, J. Appl. Phys., v. 73, No. 5, 1993, pp. 2411 - 2418.
 I. Christov, S. Dimova, T. Boyadjiev, Stability and Bifurcation of the Magnetic
Flux Bound States in Stacked Josephson Junctions. LNCS, v. 5434, 2009, pp. 224 - 232.
|July 1, 2009, at 11.00, ( LIT, r. 310 ) the seminar LIT will be held:|
1. V.B. Zlokazov: "On estimation of the exponential distribution parameter under
conditions of small statistics and observation interval"
The exponential distribution is defined over the total axis, and its
parameters describe the whole set of values. Since all the observations
are performed within a finite interval [t1,t2], added to what, t1 is
sometimes substantially greater than zero, even the theoretical mean
and variance are strongly biased as compared with the true parameters,
and all the more are the estimates. Another unfavorable factor for the
reliability of these estimates is the low statistics of observations.
The paper adduces the results of the mathematical analysis of the
2. V.B. ZLOKAZOV, Yu.S. Tsyganov: "Half-Life Time Estimation Under Indefinite 'Mother - Daughter' Relation"
The situation is even more depressing if low statistics and insufficient
observation interval are accompanied by an indefinite "mother -
daughter" relation, when in the observed picture the decays are
chaotically intermingled with each other, and it is not clear who is the
mother, and who is the daughter.
The report suggests a method for a sufficiently reliable estimate of the
half-life time parameter under more favorable conditions, and its lower
bound under less favorable ones.
|June 25, 2009, at 15.00, ( LIT, r. 310 ) the seminar LIT will be held:|
A.A. Egorov (GPI RAS), A.L. Sevastyanov, K.P. Lovetskiy,
L.A. SEVASTIANOV (PFUR), E.A. Hayryan: "Adiabatic modes of smoothly irregular open waveguide: zero approximation"
Adiabatic model of smoothly irregular multilayer optical waveguides in absence of irregularities coincides with regular waveguide model in terms of longitudinal components of electromagnetic fields of waveguide modes. Such a model deals with transfer matrix formalism.
The same formalism is also valid for investigation of waveguide and leaky modes of regular waveguide. We have used this formalism to
calculate dispersion relations and field amplitudes with the help of regularized method of solution of homogeneous system of linear
|June 18, 2009, at 15.00, ( LIT, r. 310 ) the seminar LIT will be held:|
| S.E. Kolos (University of California, Irvine, USA, CERN, Geneva): "Results of the analysis of methods and approaches to the experimental data monitoring within the ATLAS CERN project"
|June 4, 2009, at 15.00, ( LIT, r. 310 ) the seminar LIT will be held:|
P. Kh. ATANASOVA, T.L. Boyadjiev,
E.V. Zemlyanaya, Yu.M. Shukrinov: "Numerical modeling of long
Josephson junctions, describing by double sine-Gordon equation "
Physical properties of magnetic flux in Josephson junctions are the
base of the modern superconducting electronics. Tunnel superconductor-
insulator-superconductor (SIS) Josephson junctions have sinusoidal
current-phase relation, while with the decrease of the barrier
transparency deviations from this relation take place. The sign
of the higher harmonic is important for many applications, in
particular in junctions like SNINS and SFIFS, where N is a
normal metal and F is a weak metallic ferromagnet. In this
work static magnetic flux distributions in long Josephson
junctions are investigated numerically taking into account
the second harmonics in the Fourier-decomposition of the
Josephson current. We have calculate some basic distributions
along the junction and analyze their stability in dependence
on the model parameters. A comparison with traditional SIS
Josephson junction model is performed.
|June 3, 2009, at 11.00, ( LIT, r. 310 ) the seminar LIT will be held:|
N.D. Dikoussar: "The Basic Element Method in Polynomial Approximation and Smoothing Problems"
To increase the solution efficiency in polynomial approximation and smoothing
problems a base element method (BEM) is suggested. The essence of the method
consists in decomposition of the algebraic polynomial via quadratic and cubic
elements, obtained with the aid of cross-ratio functions. The main properties of BEM
comprise: threefold reduction of the order of derivatives in function decomposition,
uniform approximation along the entire length, expansion of the approximation
interval, direct relationship of model and data, the use of continuous parameters for
adjustment of computation accuracy and stability. The use of BEM opens new
possibilities for increasing the efficiency of the LSM procedures when resolving
polynomial regression problems.
|May 28, 2009, at 15.00, ( LIT, r. 310 ) the seminar LIT will be held:|
O. Zaimidoroga, O. Strelcova, K. FOMENKO: "Modeling of the propagation of electromagnetic pulses in binary scintillator media"
The propagation of electromagnetic pulses in binary scintillator
media has been modeled. The spatial evolution of electromagnetic
excitations caused by particle passing through the scintillator
has been studied. Space-time dependence of light profiles,
time dependence of light-media energy balance and estimation
of signal formation length were obtained.
|April 24, 2009, at 11.00, ( LIT, r. 310 ) the seminar LIT will be held:|
Saha Bijan: "Spinor fields in anisotropic cosmologies"
(Materials of Doctoral Thesis)
|April 2, 2009, at 15.00, ( LIT, r. 310 ) the seminar LIT will be held:|
A.V. Tikhonenko (State university of nuclear power engineering, Obninsk): "Application-oriented program system with the analytical-numerical algorithms
in symbolic mathematical packets for solving of applied problems of nuclear
engineering and particle physics "
Application-oriented program system are developed with the analytical-numerical algorithms for
solving of applied problems of nuclear engineering and particle physics; series of applied results are
obtained with program system. Theoretical foundations of program system creation are developed on
basis of the analytical-numerical algorithms in symbolic mathematical packets.
|January 28, 2009, at 15.00, ( LIT, r. 310 ) the seminar LIT will be held:|
| V.V.Korenkov, L.G.Levchuk (Research center "Kharkov physico-technical institute"): "Preparation of the Grid-infrastructures of LIT JINR and Research Center KhPTI for CMS (CERN) experimental data processing"
|January 22, 2009, at 15.00, ( LIT, r. 310 ) the seminar LIT will be held:|
Ju.V. Tchemarina (Tver State University): "Analytical and numerical investigation of gravitating static
spherically symmetric scalar field configurations"
(Materials of Master's Thesis)
The thesis discusses static particlelike configurations of minimally coupled
gravitating scalar fields are considered. An exact general solution to the
inverse problem for spherically symmetric configurations in the form of an
integral formula, whereby one can find an associated potential and space-time
metric, is obtained. The common properties of scalar field black holes, regular
solutions, wormholes and topological solutions are studied. A new two-parameter
family of exact asymptotically flat solutions to the Einstein-scalar field equations
with a positive kinetic term is obtained. Numerical simulations of the topological
geon with a phantom scalar field and given potential are performed.
|Archive of LIT Seminars (2008)