Труды сотрудников ИВМ СО РАН

[Text] / N.I. Kosarev, N.Y. Shaparev // Quantum Electron. - 2006. - Vol. 36, Is. 4. - pp. 369-375, DOI 10.1070/QE2006v036n04ABEH013153. - Cited References: 23 . - ISSN 1063-7818РУБ Engineering, Electrical & Electronic + Physics, Applied

Аннотация: The problem of ionisation of atomic sodium in the field of resonance laser radiation is numerically solved taking radiative transfer into account. Seed electrons are produced due to the mechanism of associative ionisation, then they gain energy in superelastic processes (collisions of the second kind) and initiate the avalanche ionisation of the medium by electron impact. We studied the effect of secondary radiation on the laser pulse propagation upon competition between the ionising and quenching electron collisions with excited atoms, on the kinetics of ionisation-induced vapour bleaching, and the plasma channel expansion in the form of a halo.


Доп.точки доступа:
Shaparev, N.Ya.; Шапарев, Николай Якимович; Косарев Н.И.

[Text] / N.I. Kosarev, N.Y. Shaparev // Quantum Electron. - 2009. - Vol. 39, Is. 12. - pp. 1112-1116, DOI 10.1070/QE2009v039n12ABEH014094. - Cited References: 13 . - ISSN 1063-7818РУБ Engineering, Electrical & Electronic + Physics, Applied

Аннотация: We report a computer simulation study of light absorption, scattering and emission at 397 nm in an ultracold calcium ion plasma under resonant excitation. The results point to spectral asymmetry of light scattering, nonlinear absorption, and emission in the plasma. An approach is proposed for ultracold plasma diagnostics using resonant optical characteristics.


Доп.точки доступа:
Shaparev, N.Ya.; Шапарев, Николай Якимович; Косарев Н.И.

[Text] / N. Rubab [et al.] // Phys. Plasmas. - 2010. - Vol. 17, Is. 10. - Ст. 103704, DOI 10.1063/1.3491336. - Cited References: 54. - This work is funded by the Higher Education Commission of Pakistan under the HEC-Overseas scholarship program Grant No. Ref: 1-1/PM OS /Phase-II/Batch-I/Austria/2007/. Part of this work was done while N. V. Erkaev was at the Space Research Institute of the Austrian Academy of Sciences in Graz. This work is also supported due to the RFBR Grant No. 09-05-91000-ANF-a. Further support is due to the "Austrian Fonds zur Forderung der Wissenschaftlichen Forschung" under Grant No. P20145-N16. . - ISSN 1070-664XРУБ Physics, Fluids & Plasmas

Аннотация: This study presents a theoretical approach to analyze the influence of kappa distributed streaming ions and magnetized electrons on the plasma wave propagation in the presence of dust by employing two-potential theory. In particular, analytical expressions under certain conditions are derived for various modes of propagation comprising of kinetic Alfven wave streaming instability, two stream instability, and dust acoustic and whistler waves. A dispersion relation for kinetic Alfven-like streaming instability has been derived. The effects of dust particles and Lorentzian index on the growth rates and the threshold streaming velocity for the excitation of the instability are examined. The streaming velocity is observed to be destabilizing for slow motion and stabilizing for fast streaming motions. It is also observed that the presence of magnetic field and superthermal particles hinders the growth rate of instability. Possible applications to various space and astrophysical situations are discussed. (C) 2010 American Institute of Physics. [doi:10.1063/1.3491336]


Доп.точки доступа:
Rubab, N.; Erkaev, N.V.; Еркаев, Николай Васильевич; Langmayr, D.; Biernat, H.K.

[Text] / D.Langmayr, N. V. Erkaev, H. K. Biernat // Planet Space Sci. - 2007. - Vol. 55, Is. 12. - P1804-1810, DOI 10.1016/j.pss.2007.01.017. - Cited References: 19 . - ISSN 0032-0633РУБ Astronomy & Astrophysics

Аннотация: This paper is devoted to the application of the modified two stream or cross current instability (MTST) to the interaction of the solar wind and Venus. Two scenarios are presented providing favorable conditions for the excitation of the instability. For the first scenario, the free energy source of the MTSI is a significant gradient drift of the solar wind protons near the subsolar ionopause. The corresponding growth rates and frequencies of the MTSI are calculated within a full electromagnetic approach for a two-component plasma. The driving source of the second considered scenario consists in the relative drift velocity between solar wind and planetary particles. For modelling this situation, the dispersion equation for a four-component plasma is solved numerically. (C) 2007 Elsevier Ltd. All rights reserved.


Доп.точки доступа:
Langmayr, D.; Erkaev, N.V.; Еркаев, Николай Васильевич; Biernat, H.K.

/ A. P. Gavriluk, N. Ya. Shaparev // Opt. Commun. - 1981. - Vol. 39, Is. 6. - P379-382, DOI 10.1016/0030-4018(81)90227-3. - Cited References: 11 . - ISSN 0030-4018РУБ Optics

Аннотация: The propagation of the resonance electromagnetic wave accompanied by gas ionization is considered. Plasma is formed through initial associative processes followed by the action of electrons which gain energy when colliding with the excited atoms. The change in the nature of the radiation propagation results from both a decrease in the ground state atom density and an increase in the probability of the upper state atom de-excitation. Concrete estimates are made for cesium. The degree of gas ionization and the wave propagation velocity of transparency are calculated. В© 1981.

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Держатели документа:
Computing Center of the Siberian Branch of the USSR, Academy of Sciences, Krasnoyarsk, USSR, 660049
ИВМ СО РАН

Доп.точки доступа:
GAVRILUK, A.P.; Гаврилюк, Анатолий Петрович; Shaparev, N.Ya.; Шапарев, Николай Якимович

/ V. M. Sadovskii // AIP Conference Proceedings. - 2014. - Vol. 1629: 6th International Conference for Promoting the Application of Mathematics in Technical and Natural Sciences, AMiTaNS 2014 (26 June 2014 through 1 July 2014, ) Conference code: 109043. - P311-318, DOI 10.1063/1.4902287 . -
Аннотация: The paper is devoted to the construction of the simplified mathematical model of thermomechanical behavior of a liquid crystal under the influence of weak mechanical and thermal perturbations. This model is based on the nonlinear equations of a micropolar viscoelastic medium with rotating particles. To describe small strains and finite rotations of molecules, the hypothesis of the dependence of potential energy on the volume change, on the angle of relative rotation and on the entropy is used in the framework of the method of internal thermodynamic parameters. The heat conduction process is described taking into account the anisotropy of a material due to the difference in coefficients of thermal conductivity along the axis of orientation of the particles and in the transverse direction. Separate equation for the tangential stress is obtained from the simplified model, which is useful for the analysis of the recently discussed issues of orientational thermoelasticity and resonant excitation of liquid crystals.

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Держатели документа:
Institute of Computational Modeling, SB RAS, Akademgorodok 50/44Krasnoyarsk, Russian Federation

Доп.точки доступа:
Sadovskii, V.M.; Садовский, Владимир Михайлович

[Текст] : статья / В. М. Садовский, Е. П. Ченцов // Вычислительные методы и программирование: новые вычислительные технологии. - 2015. - Т. 16, № 2. - С. 318-327 . - ISSN 1726-3522
   Перевод заглавия: Analysis of resonant excitation of layered and block media on the basis of discrete models

УДК

519.63

539.37

Аннотация: В рамках дискретных моделей исследуются резонансные процессы в структурно неоднородных материалах со слоистой и блочной микроструктурой. Вычислены собственные частоты продольного движения частиц в линейной моноатомной цепочке, имитирующей слоистую среду, с различными типами граничных условий. Для анализа поведения цепочки в окрестности резонансных частот построены спектральные портреты матриц. Показано, что при предельном переходе от модели моноатомной цепочки с упругими связями, учитывающей сопротивление вращению частиц, к модели моментного континуума выделяется характерная резонансная частота вращательного движения, не зависящая от длины цепочки.
Resonant processes in structurally inhomogeneous materials of layered and block microstructure are studied in the framework of discrete models. Natural frequencies of longitudinal motion in a linear monato\-mic chain modeling a layered medium are determined for various boundary conditions. In order to analyze the behavior of the chain near resonant frequencies, the spectral portraits of the corresponding matrices are specified. It is shown that a special resonant frequency of rotational motion is observed when passing to the limit from a model of a monatomic chain with elastic connections to a moment continuum model. The particle rotation resistance is taken into account in this passage to the limit. This special resonant frequency does not depend on the chain length.

РИНЦ

Держатели документа:
Институт вычислительного моделирования СО РАН

Доп.точки доступа:
Ченцов, Евгений Петрович; Sadovskii V.M.

[Text] / V. Shaydurov, G. Shchepanovskaya, M. Yakubovich ; ed. M. D. Todorov // APPLICATION OF MATHEMATICS IN TECHNICAL AND NATURAL SCIENCES : AMER INST PHYSICS, 2015. - Vol. 1684: 7th International Conference on Application of Mathematics in Technical (JUN 28-JUL 03, 2015, Albena, BULGARIA). - Ст. UNSP 020003. - (AIP Conference Proceedings), DOI 10.1063/1.4934284. - Cited References:23 . - РУБ Mathematics, Applied + Physics, Applied

Аннотация: In the paper, a mathematical model and a numerical algorithm are proposed for modeling the complex of phenomena which accompany the passage of a friable asteroid-comet body through the Earth's atmosphere: the material ablation, the dissociation of molecules, and the radiation. The proposed model is constructed on the basis of the Navier-Stokes equations for viscous heat-conducting gas with an additional equation for the motion and propagation of a friable lumpy-dust material in air. The energy equation is modified for the relation between two its kinds: the usual energy of the translation of molecules (which defines the temperature and pressure) and the combined energy of their rotation, oscillation, electronic excitation, dissociation, and radiation. For the mathematical model of atmosphere, the distribution of density, pressure, and temperature in height is taken as for the standard atmosphere. An asteroid-comet body is taken initially as a round body consisting of a friable lumpy-dust material with corresponding density and significant viscosity which far exceed those for the atmosphere gas. A numerical algorithm is proposed for solving the initial-boundary problem for the extended system of Navier-Stokes equations. The algorithm is the combination of the semi-Lagrangian approximation for Lagrange transport derivatives and the conforming finite element method for other terms. The implementation of these approaches is illustrated by a numerical example.

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Держатели документа:
SB RAS, Inst Computat Modeling, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Krasnoyarsk 660041, Russia.

Доп.точки доступа:
Shchepanovskaya, G.I.; Щепановская, Галина Ивановна; Yakubovich, M.V.; Якубович, Максим Викторович; Todorov, M.D. \ed.\; Шайдуров, Владимир Викторович

/ A. E. Ershov [et al.] // J. Quant. Spectrosc. Radiat. Transf. - 2017. - Vol. 191. - P1-6, DOI 10.1016/j.jqsrt.2017.01.023 . - ISSN 0022-4073
Аннотация: We have studied thermal effects occurring during excitation of optical plasmonic waveguide (OPW) in the form of linear chain of spherical Ag nanoparticles by pulsed laser radiation. It was shown that heating and subsequent melting of the first irradiated particle in a chain can significantly deteriorate the transmission efficiency of OPW that is the crucial and limiting factor and continuous operation of OPW requires cooling devices. This effect is caused by suppression of particle's surface plasmon resonance due to reaching the melting point temperature. We have determined optimal excitation parameters which do not significantly affect the transmission efficiency of OPW. © 2017

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Держатели документа:
Institute of Computational Modeling, Federal Research Center KSC SB RAS, Krasnoyarsk, Russian Federation
Institute of Nanotechnology, Spectroscopy and Quantum Chemistry, Siberian Federal University, Krasnoyarsk, Russian Federation
Siberian State Aerospace University, Krasnoyarsk, Russian Federation
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, Russian Federation
Royal Institute of Technology, Stockholm, Sweden
The Beckman Institute for Advanced Science and Technology, University of Illinois at Urbana-Champaign, Urbana, IL, United States

Доп.точки доступа:
Ershov, A.E.; Ершов, Александр Евгеньевич; Gerasimov, V. S.; Gavrilyuk, A.P.; Гаврилюк, Анатолий Петрович; Karpov, S. V.; Zakomirnyi, V. I.; Rasskazov, I. L.; Polyutov, S. P.

/ V. Sadovskii, O. Sadovskaya // Advances in Mechanics of Microstructured Media and Structures : Springer Verlag, 2018. - Vol. 87. - P297-341, DOI 10.1007/978-3-319-73694-5_17 . -
Аннотация: A simplified mathematical model of thermomechanical behavior of a liquid crystal in nematic phase under weak mechanical and thermal perturbations as a micropolar viscoelastic medium with rotating particles is constructed. This model is based on the assumption that potential energy of elastic deformation depends on four parameters—the change in volume, angle of relative rotation of particles, first invariant of curvature measure and entropy. The heat conduction process is described taking into account the anisotropy of a material due to the difference in coefficients of thermal conductivity along the axis of orientation of particles and in the transverse direction. Influence of electric field on the layer of a liquid crystal is modeled by means of the equations of electrostatics for an inhomogeneous anisotropic medium. In the plane formulation, the parallel computational algorithm is worked out on the basis of splitting method with respect to spatial variables, Godunov’s gap decay method, Ivanov’s method of constructing finite-difference schemes with controlled dissipation properties and method of straight lines for finding electric field. The algorithm is implemented using the CUDA technology for computer systems with graphics accelerators. Results of computations of wave motions demonstrating the efficiency of proposed method and algorithm are represented. It is shown that the effect of orientational thermoelasticity of a liquid crystal in the form of re-orientation of particles in an inhomogeneous temperature field can only be evident in the presence of tangential stresses at the boundary. The modes of resonance excitation in a liquid crystal at the eigenfrequency of rotational motion of particles are analyzed numerically. © Springer International Publishing AG, part of Springer Nature 2018.

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Держатели документа:
Siberian Branch of the Russian Academy of Sciences, Institute of Computational Modeling, Akademgorodok 50/44, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Sadovskii, V.; Sadovskaya, O.

/ Y. Gaponenko, A. Mialdun, V. Shevtsova // Phys. Fluids. - 2018. - Vol. 30, Is. 6, DOI 10.1063/1.5032107 . - ISSN 1070-6631
Аннотация: We develop a connection between instabilities in a two-liquid miscible system and in a liquid mixture with a linear distribution of density. In both cases, the liquids are placed in a closed cell and subjected to horizontal oscillations at different frequencies and amplitudes in a microgravity environment. The study includes parabolic flight experiments and numerical simulations. We examine the transformation of the interfacial pattern when the diffusive interface widens from a thin transient zone occupying 4% of the cell height to a situation when it occupies the entire cell height. In the case of sharp concentration (density) difference between miscible liquids, under reduced gravity conditions, instability leads to the formation of rectangular columns of liquids of alternating densities with an amplitude nearly equal to the height of the cell. The increase of the interface width promotes the selection of a smaller wave number associated with columns. The experimental observations are confirmed by the numerical simulations. In order to quantify the pattern regimes, we suggested to use the averaged mass flux through the mid-height of the cell. © 2018 Author(s).

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Держатели документа:
MRC, CP165/62, Universite Libre de Bruxelles, Ave. Franklin Roosevelt, 50, Brussels, Belgium
Institute of Computational Modelling, SB RAS, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Gaponenko, Y.; Mialdun, A.; Shevtsova, V.

/ V. M. Sadovskii, O. V. Sadovskaya, V. A. Detkov // IOP Conference Series: Earth and Environmental Science : Institute of Physics Publishing, 2018. - Vol. 193: 5th All-Russian Conference with International Participation on Polar Mechanics 2018 (9 October 2018 through 11 October 2018, ) Conference code: 141746, Is. 1, DOI 10.1088/1755-1315/193/1/012058 . -
Аннотация: Computational technology for multiprocessor computing systems of cluster architecture is developed, the ultimate goal of which is numerical modeling of wave fields generated by the electromagnetic pulse source "Yenisei" in blocky-layered geomedia. To describe the wave processes, mathematical models of the dynamics of elastic and elastic-plastic media, of porous and granular materials are applied. The algorithms of numerical realization are constructed based on the method of two-cyclic splitting with respect to spatial variables. Computational experiments showed that the proposed technology allows reproducing the system of waves near the region of excitation of seismic oscillations in 3D setting with a high degree of details and accuracy. The results of computations can be used in working out the optimal modes of functioning the source "Yenisei", when mechanical characteristics of the layers vary in a wide range from solid and frozen grounds with inclusions of rock till granular and clayey water-saturated grounds. Numerical analysis makes also possible to obtain the averaged data, necessary for the adequate simulation of the localized pulse action from the source, using simplified mathematical models for calculating the synthetic seismograms of reflected waves over large scale and at great depth of layers bedding in complex geomedia. © Published under licence by IOP Publishing Ltd.

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Держатели документа:
Institute of Computational Modeling, SB RAS, Akademgorodok 50/44, Krasnoyarsk, Russian Federation
LLC Evenkiyageofizika, Leningradskaya 66, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Sadovskii, V. M.; Sadovskaya, O. V.; Detkov, V. A.

[Текст] : статья / О. В. Садовская, В. М. Садовский // Решетневские чтения. - 2018. - Т. 1, № 22. - С. 575-577 . - ISSN 1990-7702
   Перевод заглавия: NUMERICAL STUDY OF WAVE FIELDS, GENERATED BY SEISMIC SOURCE “YENISEI”, IN BLOCKY-LAYERED MEDIA

УДК

539.37

Аннотация: Разработана вычислительная технология для многопроцессорных систем кластерной архитектуры, позволяющая с высокой степенью детализации моделировать систему волн вблизи области возбуждения сейсмических колебаний импульсным источником «Енисей».
We developed computational technology for multiprocessor computing systems of cluster architecture, which allows modeling a system of waves near the region of excitation of seismic oscillations by a pulse source “Yenisei” with a high degree of details.

РИНЦ

Держатели документа:
Институт вычислительного моделирования СО РАН

Доп.точки доступа:
Садовская, О.В.; Sadovskaya O.V.; Садовский, В.М.; Sadovskii V.M.