Труды сотрудников ИВМ СО РАН

[Text] : научное издание / Gorban A.N.,Zinovyev A.Y., Popova T. // Institut des Hautes Etudes Scientifiques Preprint . - 2001
   Перевод заглавия: Статистический подход к автоматической идентификации генов без учителя
Аннотация: Overview of statistical methods of gene identification is made. Particular attention is given to the methods which need not a training set of already known genes. After analysis several statistical approaches are proposed for computational exon identification in whole genomes. For several genomes an optimal window length for averaging GC-content function and calculating codon frequencies has been found. Self-training procedure based on clustering in multidimensional codon frequencies space is proposed.

http://icm.krasn.ru/refextra.php?id=2108


Доп.точки доступа:
Zinovyev, A.Y.; Зиновьев, Андрей Юрьевич; Popova, T.G.; Попова Т.Г.; Горбань, Александр Николаевич

/ O.V. Kaptsov [et al.] // J. Appl. Mech. Tech. Phys. - 2012. - Vol. 53, Is. 5. - pp. 672-678, DOI 10.1134/S0021894412050069. - Cited References: 16. - This work was supported by the Russian Foundation for Basic Research (Grants Nos. 10-01-00435-a and 11-01-09368-mob_z), by the Council on Grants of the President of the Russian Federation for Support of Leading Scientific Schools (Grants Nos. NSh-544.2012.1 and NSh-6293.2012.9), and by the Russian Academy of Sciences (Integration Project No. 103 (Siberian, Far-East, and Ural Branches)). . - 7. - ISSN 0021-8944РУБ Mechanics + Physics, Applied

Аннотация: A mathematical model of the far turbulent wake behind a towed body in a passively stratified medium, based on the known semi-empirical e-E > model of turbulence, is considered. A grouptheoretical analysis of the model is performed. With the help of the method of B-determining equations, the model is reduced to a system of ordinary differential equations, which is solved numerically. The resultant solution is compared with a self-similar solution obtained by direct numerical integration of the differential equations at large distances from the body.


Доп.точки доступа:
Kaptsov, O.V.; Капцов, Олег Викторович; Fomina, A.V.; Chernykh, G.G.; Schmidt, A.V.; Шмидт, Алексей Владимирович

/ N.Y. Shaparev // 2012 INTERNATIONAL CONFERENCE ON OPTOELECTRONICS AND MICROELECTRONICS (ICOM) : IEEE COMPUTER SOC, 2012. - International Conference on Optoelectronics and Microelectronics (ICOM) (AUG 23-25, 2012, Changchun, PEOPLES R CHINA). - pp. 342-345. - Cited References: 14 . - ISBN 978-1-4673-2639-1РУБ Engineering, Electrical & Electronic + Nanoscience & Nanotechnology + Optics

Аннотация: The paper deals with absorption of resonance and continuum radiation in an expanding gaseous sphere. For self-similar expansion, a probability of radiation to be transmitted is studied depending on the velocity gradient and optical thickness. It is shown that an optically thick medium grows thinner with the velocity gradient.

РИНЦ


Доп.точки доступа:
Шапарев, Николай Якимович

[Text] / A.D. Aponasenko [et al.] // Water Resour. - 2010. - Vol. 37, Is. 6. - pp. 817-824, DOI 10.1134/S0097807810060072. - Cited References: 17 . - ISSN 0097-8078РУБ Water Resources

Аннотация: Multidisciplinary studies carried out in 2007-2008 revealed the features of concentration dynamics of biogenic and organic substances, bacterio- and phytoplankton, and chlorophyll in different reaches of the Enisei River. By the development state of bacterio- and phytoplankton, saprobity index, total primary production g O(2)/(m(2) day), and self-purification index, the water refers to the third quality class (satisfactorily clean), beta-mesosaprobic. The Enisei refers to the oligotrophic type upstream of the Angara mouth and to the mesotrophic type downstream of it.


Доп.точки доступа:
Aponasenko, A.D.; Апонасенко, Анатолий Дмитриевич; Dryukker, V.V.; Sorokovikova, L.M.; Shchur, L.A.; Щур, Людмила Александровна

[Text] / V. K. Andreev // Differ. Equ. - 2008. - Vol. 44, Is. 12. - P1730-1736, DOI 10.1134/S0012266108120094. - Cited References: 5. - The research was financially supported by Integration Project no. 2.15 of the Siberian Branch of the Russian Academy of Sciences and by the 'Program for the Support of Leading Scientific Schools of the Russian Federation (project no. NSh-587.3.2006.1). . - ISSN 0012-2661РУБ Mathematics

Аннотация: We study an adjoint initial-boundary value problem for linear parabolic equations; which arises when modeling the unidirectional motion of two viscous fluids with a common interface under the action of a pressure gradient. Under some conditions on the pressure gradient, we obtain a priori estimates and show that the solution enters a stationary mode. For semi-bounded layers, we find the solution in closed form and indicate the case of a self-similar solution. We determine the volume flow rates in the layers.

Полный текст на сайте издательства


Доп.точки доступа:
Андреев, Виктор Константинович

[Text] / C. J. Farrugia [et al.] // J. Geophys. Res-Space Phys. - 2001. - Vol. 106, Is. A12. - P29373-29385, DOI 10.1029/2001JA000034. - Cited References: 42 . - ISSN 0148-0227РУБ Astronomy & Astrophysics

Аннотация: We carry out a first comparison with spacecraft measurements of our recent three-dimensional, one-fluid magnetohydrodynamic (MHD) model for the anisotropic magnetosheath [Erkaev et al., 1999], using data acquired by the Wind spacecraft on an inbound magnetosheath pass on December 24, 1994. The spacecraft trajectory was very close to the stagnation streamline, being displaced by less than 1/2 hour from noon and passing at low southern magnetic latitudes (similar to4.5degrees). All quantities downstream of the bow shock are obtained by solving the Rankine-Hugoniot equations taking the pressure anisotropy into account. In this application of our model we close the MHD equations by a "bounded anisotropy" ansatz using for this purpose the inverse correlation between the proton temperature anisotropy, A(p) (equivalent to T-pperpendicular to/T-pparallel to - 1) and the proton plasma beta parallel to the magnetic field beta(pparallel to) observed on this pass when conditions are steady. In the model the total perpendicular pressure is prescribed and not obtained self-consistently. For all quantities studied we find very good agreement between the predicted and the observed profiles, indicating that the bounded anisotropy method of closing the magnetosheath equations, first suggested by Denton et al. [1994], is valid and reflects the physics of the magnetosheath well. We assess how sensitive our model results are to different parameters in the A(p) = alpha(0)beta(pparallel to)(-alpha1) (alpha(1) 0) relation, taking for al the two limiting values (0.4, 0.5) resulting from the two-dimensional hybrid simulations of Gary et al. [1997], and varying alpha(0) in the range 0.6 - 0.8. Input solar wind conditions are as measured on this pass. In general, the model profiles depend more strongly on alpha(0) than on al. In particular, decreasing alpha(0) narrows the width of the plasma depletion layer (PDL) and widens the mirror stable region. For the lowest value of alpha(0) the mirror stable region extends sunward of the outer edge of the PDL. For the other two values of alpha(0) and regardless of the value of al, it is contained within the PDL. Finally, we also study phenomenological double-polytropic laws and find polytropic indices gamma(perpendicular to) approximate to 1 and gamma(parallel to) approximate to 1.5. These results agree well with those of Hau et al. [1993] inferred from Active Magnetospheric Particle Tracer Explorers/ Ion Release Module data on a crossing of the near-subsolar magnetosheath.


Доп.точки доступа:
Farrugia, C.J.; Erkaev, N.V.; Еркаев, Николай Васильевич; Vogl, D.F.; Biernat, H.K.; Oieroset, M.; Lin, R.P.; Lepping, R.P.

[Text] / A. Shevyrnogov [et al.] // Adv. Space Res. - 2008. - Vol. 41, Is. 1. - P36-40, DOI 10.1016/j.asr.2007.02.008. - Cited References: 7 . - ISSN 0273-1177РУБ Astronomy & Astrophysics + Geosciences, Multidisciplinary + Meteorology & Atmospheric Sciences

Аннотация: The paper shows the efficiency of an application of the vegetation index image time series to determine long-term vegetation dynamics. The influence of large industrial centers of Siberia on the near-by vegetation is demonstrated. The analysis of the data shows that the influence of industrial waste is stronger in the Siberian North. These regions are characterized by critical conditions for vegetation existence. In the south of the Krasnoyarsk region, human impact is also important, but the possibility of vegetation self-rehabilitation is higher. The present-day economic situation in Russia is unique, with a temporary abrupt fall of industrial production and its following increase. Thus, we managed to analyze the degree of human impact on the environment within a relatively short-time interval. (C) 2007 Published by Elsevier Ltd on behalf of COSPAR.


Доп.точки доступа:
Shevyrnogov, A.; Vysotskaya, G.; Высоцкая, Галина Степановна; Sukhinin, A.; Frolikova, O.; Tchernetsky, M.

[Text] : статья / W. P. Yudistiawan, S. Ansumali, I. V. Karlin // Physical review E. - 2008. - Vol. 78. - Ст. 016705, DOI 10.1103/PhysRevE.78.016705 . - ISSN 1539-3755
Аннотация: Recently, analytical solutions for the nonlinear Couette flow demonstrated the relevance of the lattice Boltzmann (LB) models to hydrodynamics beyond the continuum limit [S. Ansumali et al., Phys. Rev. Lett. 98, 124502 (2007)]. In this paper, we present a systematic study of the simplest LB kinetic equation—the nine-bit model in two dimensions—in order to quantify it as a slip flow approximation. Details of the aforementioned analytical solution are presented, and results are extended to include a general shear- and force-driven unidirectional flow in confined geometry. Exact solutions for the velocity, as well as for pertinent higher-order moments of the distribution functions, are obtained in both Couette and Poiseuille steady-state flows for all values of rarefaction parameter (Knudsen number). Results are compared with the slip flow solution by Cercignani, and a good quantitative agreement is found for both flow situations. Thus, the standard nine-bit LB model is characterized as a valid and self-consistent slip flow model for simulations beyond the Navier-Stokes approximation.

Держатели документа:
ИВМ СО РАН : 660036, Красноярск, Академгородок, 50, стр.44

Доп.точки доступа:
Ansumali, Santosh; Karlin, I.V.; Карлин, Илья Вениаминович

[Text] / Y. Y. STEPANSKII [et al.] // React. Kinet. Catal. Lett. - 1980. - Vol. 14, Is. 3. - P335-339, DOI 10.1007/BF02073501. - Cited References: 3 . - ISSN 0133-1736РУБ Chemistry, Physical


WOS

Держатели документа:
ACAD SCI USSR,CTR COMP,KRASNOYARSK,USSR
ИВМ СО РАН
Доп.точки доступа:
STEPANSKII, Y.Y.; EVMENENKO, N.P.; YABLONSKII, G.S.; BYKOV, V.I.; Быков, Валерий Иванович

[Text] / V. I. BYKOV, A. N. GORBAN // React. Kinet. Catal. Lett. - 1985. - Vol. 27, Is. 1. - P153-155, DOI 10.1007/BF02064477. - Cited References: 3 . - ISSN 0133-1736РУБ Chemistry, Physical


WOS,
Scopus

Держатели документа:
Computing Center, Krasnoyarsk, Russia
ИВМ СО РАН
Доп.точки доступа:
BYKOV, V.I.; Быков, Валерий Иванович; GORBAN, A.N.; Горбань, Александр Николаевич

[Text] / T. P. PUSHKAREVA, V. I. BYKOV // React. Kinet. Catal. Lett. - 1993. - Vol. 49, Is. 1. - P45-51, DOI 10.1007/BF02084027. - Cited References: 5 . - ISSN 0133-1736РУБ Chemistry, Physical

Аннотация: The number of steady states and their stability is analyzed for the kinetic model of non-autocatalytic chemical reactions corresponding to the scheme 1. 2Z half arrow right over half arrow left 2X; 2. Z half arrow right over half arrow left Y; 3. X + Y --> 2Z; 4. X half arrow right over half arrow left S The regions of three steady states and self-oscillations have been established in various parametric planes.

WOS,
Scopus

Держатели документа:
Computer Center, Krasnoyarsk, 660036, Russian Federation
ИВМ СО РАН

Доп.точки доступа:
PUSHKAREVA, T.P.; BYKOV, V.I.; Быков, Валерий Иванович

/ T. P. Pushkareva, V. I. Bykov // Reaction Kinetics & Catalysis Letters. - 1994. - Vol. 52, Is. 1. - P87-93, DOI 10.1007/BF02129854 . - ISSN 0133-1736
Аннотация: The bifurcation curves of the multiplicity and neutrality of steady states are constructed for the kinetic model, corresponding to the reaction scheme {Mathematical expression} The region of self-oscillation is singled out. В© 1994 Akademiai Kiado.

Scopus

Держатели документа:
Computer Center, Krasnoyarsk, 660036, Russian Federation
ИВМ СО РАН

Доп.точки доступа:
Pushkareva, T.P.; Bykov, V.I.; Быков, Валерий Иванович

/ A. M. Fedotov // Vestnik Moskovskogo Universiteta. Ser. 15 Vychislitel'naya Matematika i Kibernetika. - 1995. - Is. 1. - P64-79 . - ISSN 0137-0782
Аннотация: The paper is devoted to the problem of analytical continuation of functions from sets, being within regularity sets, at the presence of errors in predetermination of initial data. The problem of constructing the optimal algorithms of continuation is considered. Estimations for the accuracy and stability of the optimal continuation algorithms are obtained. A new form is proposed of the uniqueness theorem of analytical functions - the theorem of asymptotic uniqueness and self-regularizating algorithms. Causes of computational instability of the analytical continuation problems are elucidated and a method for organization of a computational process with control of computational errors is proposed.

Scopus

Держатели документа:
Vychislitel'nyj Tsentr SO RAN, Krasnoyarsk, Russian Federation
ИВМ СО РАН

Доп.точки доступа:
Fedotov, A.M.; Федотов, Анатолий Михайлович

/ V. V. Shaidurov // Computers and Mathematics with Applications. - 1996. - Vol. 31, Is. 4-5. - P161-171 . - ISSN 0898-1221
Аннотация: The paper deals with a cascadic conjugate-gradient method (shortly called the CCG-algorithm) which was proposed by P. Deuflhard and can be considered as a simpler version of a multigrid (multilevel) method. We define it recurrently for discrete self-adjoint positive-definite problems on a sequence of grids. On the coarsest grid, the linear discrete algebraic system is solved directly. On the finer grids, the system is iteratively solved by the conjugate-gradient method where the starting guess is an interpolation of the approximated solution on the previous grid. Any preconditioning or restriction to coarser grids is not implemented. Nevertheless, the CCG-algorithm has the same optimal property compared to multigrid methods; namely, the algorithm converges with a rate which is independent of the number of unknowns and the number of grids. As an example, this property is proved for elliptic second order Dirichlet problems in two-dimensional, convex, polygonal bounded domains. For ensuring convergence, the number of iterations on each grid level has to increase from finer to coarser grids. The optimal dependence of these numbers is established with respect to the mesh size and the number of unknowns. The theory has been presented in an abstract setting which allows the application to both finite element and finite difference methods. CopyrightВ©1996 Elsevier Science Ltd. All rights reserved.

Scopus

Держатели документа:
Computing Center, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk, 660036, Russian Federation
ИВМ СО РАН

Доп.точки доступа:
Shaidurov, V.V.; Шайдуров, Владимир Викторович

/ I. I. Koksharov // Mech. Compos. Mater. - 1996. - Vol. 32: IX International Conference on the Mechanics of Composite Materials (OCT, 1995, RIGA, LATVIA), Is. 4. - P374-380, DOI 10.1007/BF02254751. - Cited References: 14 . - ISSN 0191-5665РУБ Mechanics + Materials Science, Composites + Polymer Science

Аннотация: In the present work, interest is centered on the theory of fracture and practical approaches to reliability estimation of unidirectional composite materials which are based on it. Fracture mechanics is considered not as a theory of macrocracks but as mechanics of fracture mechanisms of the composites with allowance made for probability estimation. A model of composite material with fibers eliminated from the carrying scheme and parameters specific to the stress-strain-damage state (SSDS) was considered. According to the model, during loading, self-accelerated energy rise is accounted for by structural damages growth - the catastrophe takes place. The model allows us to calculate the critical stress. The composites redistribute forces from overloading zones to neighboring ones by microstructural deformations and damages. It is the effect of reservation of carrying ability. Due to this effect, low-value probability of fracture is sufficiently less for the composite than for homogeneous materials. The approach allows us to evaluate the reliability function for Both static loading and fatigue.

WOS,
Scopus

Держатели документа:
Computing Center, Russian Academy of Sciences, Krasnoyarsk, Russian Federation
ИВМ СО РАН

Доп.точки доступа:
Koksharov, I.I.; Кокшаров, Игорь Ильич

[Text] / N. Y. Shaparev // J. Phys. B-At. Mol. Opt. Phys. - 2014. - Vol. 47, Is. 22. - Ст. 225401, DOI 10.1088/0953-4075/47/22/225401. - Cited References: 11 . - ISSN 0953-4075. - ISSN 1361-6455РУБ Optics + Physics, Atomic, Molecular & Chemical

Аннотация: The paper deals with absorption of external continuum radiation in a self-similarly expanding gaseous sphere. Frequency probability and integral probability of radiation absorption in the resonance frequency range are determined depending on the expansion velocity gradient and thickness of the optical medium. It is shown that expansion results in a reduced optical thickness of the medium and enhanced integral absorption.

WOS

Держатели документа:
Russian Acad Sci, Inst Computat Modeling, Krasnoyarsk 660036, Russia
ИВМ СО РАН

Доп.точки доступа:
Шапарев, Николай Якимович

/ I. F. Shaikhislamov [et al.] // Astrophys. J. - 2014. - Vol. 795, Is. 2, DOI 10.1088/0004-637X/795/2/132 . - ISSN 0004-637X
Аннотация: In the present series of papers we propose a consistent description of the mass loss process. To study in a comprehensive way the effects of the intrinsic magnetic field of a close-orbit giant exoplanet (a so-called hot Jupiter) on atmospheric material escape and the formation of a planetary inner magnetosphere, we start with a hydrodynamic model of an upper atmosphere expansion in this paper. While considering a simple hydrogen atmosphere model, we focus on the self-consistent inclusion of the effects of radiative heating and ionization of the atmospheric gas with its consequent expansion in the outer space. Primary attention is paid to an investigation of the role of the specific conditions at the inner and outer boundaries of the simulation domain, under which different regimes of material escape (free and restricted flow) are formed. A comparative study is performed of different processes, such as X-ray and ultraviolet (XUV) heating, material ionization and recombination, H+ 3 cooling, adiabatic and Lyα cooling, and Lyα reabsorption. We confirm the basic consistency of the outcomes of our modeling with the results of other hydrodynamic models of expanding planetary atmospheres. In particular, we determine that, under the typical conditions of an orbital distance of 0.05AU around a Sun-type star, a hot Jupiter plasma envelope may reach maximum temperatures up to ∼9000K with a hydrodynamic escape speed of ∼9 km s-1, resulting in mass loss rates of ∼ (4-7) · 1010 g s-1. In the range of the considered stellar-planetary parameters and XUV fluxes, that is close to the mass loss in the energy-limited case. The inclusion of planetary intrinsic magnetic fields in the model is a subject of the follow-up paper (Paper II).

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Полный текст (доступен только в локальной сети)

Держатели документа:
Institute of Computational Modelling, SB RASKrasnoyarsk, Russian Federation

Доп.точки доступа:
Shaikhislamov, I.F.; Khodachenko, M.L.; Sasunov, Y.L.; Lammer, H.; Kislyakova, K.G.; Erkaev, N.V.; Еркаев, Николай Васильевич

/ N. Y. Shaparev // Russ. Phys. J. - 2015. - Vol. 58, Is. 2. - P198-204, DOI 10.1007/s11182-015-0482-0 . - ISSN 1064-8887
Аннотация: The absorption of external radiation and continuum radiation originating from the center in a self-similar expanding gas sphere is considered. The frequency and integral probabilities of radiation absorption in a resonance frequency domain are analyzed depending on the expansion velocity gradient and the optical thickness of the medium. It is demonstrated that the optical density of the medium decreases and the integral absorption increases in the expanding medium. © 2015, Springer Science+Business Media New York.

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WOS

Держатели документа:
Institute of Computational Modeling of the Siberian Branch of the Russian Academy of Sciences, Krasnoyarsk, Russian Federation
National Research Tomsk State University, Tomsk, Russian Federation

Доп.точки доступа:
Шапарев, Николай Якимович

[Text] / A. V. Shmidt // J. Appl. Mech. Tech. Phys. - 2015. - Vol. 56, Is. 3. - P414-419, DOI 10.1134/S0021894415030104. - Cited References:17. - This work was supported by the Russian Foundation for Basic Research (Grant No. 13-01-00246) and by the Council on the Grants of the President of the Russian Federation for State Support of the Leading Scientific Schools (Grant No. NSh-4382.2014.1). . - ISSN 0021-8944. - ISSN 1573-8620РУБ Mechanics + Physics, Applied

Аннотация: A mathematical model of the flow in a round submerged turbulent jet is considered. The model includes differential transport equations for the normal components of the Reynolds stress tensor and Rodi's algebraic approximations for shear stresses. A theoretical-group analysis of the examined model is performed, and a reduced self-similar system of ordinary differential equations is derived and solved numerically. It is shown that the calculated results agree with available experimental data.

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Scopus

Держатели документа:
Russian Acad Sci, Siberian Branch, Inst Computat Modeling, Krasnoyarsk 660036, Russia.

Доп.точки доступа:
Шмидт, Алексей Владимирович; Russian Foundation for Basic Research [13-01-00246]; Russian Federation [NSh-4382.2014.1]

/ N. Y. Shaparev // Dokl. Phys. - 2015. - Vol. 60, Is. 11. - P479-482, DOI 10.1134/S102833581511004X . - ISSN 1028-3358
Аннотация: Absorption of external radiation in self-similar expanding gaseous sphere is considered. The dependence of the optical thickness of the medium, contour shape, and width of the spectral line of absorption on the initial optical thickness and ratio of the boundary gas spread velocity to the thermal velocity of atoms is determined. © 2015, Pleiades Publishing, Ltd.

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Держатели документа:
Institute of Computational Modelling, Siberian Branch, Russian Academy of Sciences, Akademgorodok 50, str. 44, Krasnoyarsk, Russian Federation
National Research Tomsk State University, pr. Lenina 36, Tomsk, Russian Federation

Доп.точки доступа:
Шапарев, Николай Якимович
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