... Nurislamova L.F. and Gubaydullin I.M. Reduction of detailed schemes for chemical transformations of formaldehyde and hydrogen oxidation reactions based on a sensitivity analysis of a mathematical model . ... Baranov A.A. and Permyakov M.S. A contour-advective semi-Lagrangian numerical algorithm for the problem of interaction between a vortex and an isolated topographic feature on a ЮВ -plane . ... Pavel'chak I.A. Numerical analysis of the FitzHugh-Nagumo model in a three-dimensional domain . ...
... Intermittency of vector fields and natural random number generators" . Kalinin A.O. and Sokoloff D.D. Growth of Jacobi fields on geodesic lines over a 2D manifold with Gaussian curvature as a random process is considered. ... Keywords: intermittency, vector field, Jacobi equation, random numbers, Lyapunov exponent. ... Kalinin A.O. тАУ Lomonosov Moscow State University, Faculty of Physics; Leninskie Gory, Moscow, 119991, Russia; Student, e-mail: kalinanton@me.com . ...
... Aspects of parallel computing to solve Helmholtz equation by a direct solver with low-rank approximation and the HSS format of data storage" . ... Keywords: Helmholtz equation, algorithms for sparse systems of linear algebraic equations, Gaussian elimination method, low-rank approximation, HSS matrix representation, distributed parallel systems, heterogeneous high-performance computing systems. ...
... A parallel algorithm for solving 2D Poisson's equation in the context of nonstationary problems . ... An algorithm for solving transient problems of gravitational gas dynamics: a combination of the SPH method with a grid method of gravitational potential computation . ... Domain decomposition based on a direct method for solving the three-dimensional Poisson's equation in nonstationary astrophysical problems . ... Iterative methods for solving inverse problems of ultrasonic tomography . ...
... Efficiency study of computation parallelization for viscous incompressible flow simulation on computing systems with shared memory by the LS-STAG method" . Marchevsky I.K. and Puzikova V.V. The LS-STAG_ext parallel software package is developed for viscous incompressible flow simulation by the LS-STAG immersed boundary method and its modifications. This package allows one to simulate a flow around moving airfoils of arbitrary shape or around airfoil systems with one or two degrees of freedom. ...
... Calculation of exact frequency-dependent rays when the solution of the Helmholtz equation is known" . Gadylshin K.G. and Protasov M.I. A numerical method is proposed for the calculation of exact frequency-dependent rays when the solution of the Helmholtz equation is known. The properties of frequency-dependent rays are analyzed and compared with the classical ray theory and with the method of finite-difference modeling for the first time. ...
... A parallel algorithm for the sparse QR decomposition of a rectangular upper quasi-triangular matrix with ND-type sparsity" . Kharchenko S.A. An algorithm for computing the sparse QR decomposition of a specially ordered rectangular matrix is proposed. ... Keywords: sparse rectangular matrix, upper quasi-triangular matrix, volume partitioning, nested dissection, QR decomposition, Householder transformations, parallel algorithm. ...
... Composition of infinitary structures" . Ryabov G.G. and Serov V.A. The infinitary structure of an n -cube, global k -ary trees, and natural numbers are considered as a single genetic structure. A number of geometric characteristics of the shortest paths in an n -cube are specified and the properties of prime number symmetry among the natural numbers are studied on the basis of this structure. ... PDF (Full text in Russian, References in English) (382KB) . ...
... Efficiency of ARM processors for classical molecular dynamics" . ... Recently, the development of ARM processors has come to the point when their floating point performance can be seriously considered for a range of scientific applications. In this paper, we present an analysis of the floating point performance of the latest ARM cores and their efficiency for the algorithms of classical molecular dynamics. ...
... A multilevel approach to algorithm and software design for exaflops supercomputers" . Glinskiy B.M., Kulikov I.M., Snytnikov A.V., Chernykh I.G., and Weins D.V. A strategy is proposed for the development of algorithms and software for exaflops supercomputers. ... Glinskiy B.M. тАУ Institute of Computational Mathematics and Mathematical Geophysics, Siberian Branch of Russian Academy of Sciences; prospekt Lavrentyeva 6, Novosibirsk, 630090, Russia; Dr. Sci., ...
... Using Intel Xeon Phi coprocessors for execution of natural join on compressed data" . ... This coprocessor uses distributed columnar indexes with interval fragmentation. The operation of the coprocessor engine is considered by an example of natural join processing. ... Keywords: columnar data representation, columnar indexes, database coprocessor, interval fragmentation, parallel database system, cluster computing systems with many-core accelerators, Intel Xeon Phi. ...
... PDF (Full text in Russian, References in English) (1.47MB) . PDF. zip (Full text in Russian, References in English) (1.30MB) . Plenkin A.V. тАУ Nuclear Safety Institute, Russian Academy of Sciences; ulitsa BolтАЩshaya TulтАЩskaya 52, Moscow, 115191, Russia; Ph.D., Scientist, e-mail: golden_dragon_84@mail.ru . Chernyshenko A.Yu. тАУ Institute of Numerical Mathematics, Russian Academy of Sciences; ulitsa Gubkina 8, Moscow, 119333, Russia; Ph.D., Scientist, e-mail: chernyshenko.a@gmail.com . ...
... It makes sense, therefore, to partition a mesh into a great number of microdomains which then are used to create subdomains. Graph partitioning methods implemented in state-of-the-art parallel partitioning tools ParMETIS, Jostle, PT-Scotch and Zoltan are based on multilevel algorithms. ... The program package for parallel large mesh decomposition GridSpiderPar was developed. ... Keywords: parallel programming, graph partitioning, mesh decomposition. ...
... An iterative method for determining the shape and conductivity of a homogeneous inclusion in the two-dimensional electrical impedance tomography problem" . Gavrilov S.V. The problem of electrical impedance tomography in a bounded two-dimensional domain with a piecewise two-valued constant electrical conductivity is considered. ... Keywords: electrical impedance tomography, piecewise constant conductivity, iterative method, Tikhonov regularization method. ...
... Three-dimensional particle-in-cell plasma simulation on Intel Xeon Phi: performance optimization and case study" . ... The features of Xeon Phi architecture that influence the performance of Particle-in-Cell plasma simulation are analyzed. ... Its performance on Xeon Phi compared to CPU is studied on three computationally intensive plasma simulation problems. ... Keywords: plasma physics, particle-in-cell method, high-performance computing, Xeon Phi, performance optimization. ...
... Iterative methods for solving inverse problems of ultrasonic tomography" . ... This paper is dedicated to rigorous mathematical substantiation of iterative methods for solving inverse problems of ultrasonic tomography. ... The representation for the Frechet derivative is obtained both for the two-dimensional problems and for the three-dimensional case. ... Keywords: coefficient inverse problems, wave equation, ultrasonic tomography, Frechet derivative, iterative methods. ...
... Numerical modeling of air-jet flows under the action of an input-exhaust system" . ... The parameters of an input-exhaust system with the largest velocity of incoming air are numerically determined. ... Logachev K.I. тАУ Shukhov Belgorod State Technological University; ulitsa Kostyukova 44, Belgorod, 308012, Russia; Dr. Sci., ... Pusanok A.I. тАУ Shukhov Belgorod State Technological University; ulitsa Kostyukova 44, Belgorod, 308012, Russia; Ph.D., Programmer, e-mail: apuzanok@mail.ru . ...
... A modified generalized residual method for minimization problems with errors of a known level in weakened norms" . ... This algorithm is a certain transform of the generalized residual method designed previously for the application in nonclassical information conditions when {\it a priori} information on the error level in an operator defining the cost functional is available only in the norms being weaker than the original ones. ...
... Представление статей для публикации . ... Публикация томов журнала . ... Шаблон письма о согласии на публикацию статьи . ... электронного журнала "Вычислительные методы и программирование" . ... Просим опубликовать в журнале "Вычислительные методы и программирование" статью <заголовок статьи>. ... Авторы согласны с правилами подготовки статьи к публикации, включая рецензирование, научное и литературное редактирование и доведение статьи до редакторских стандартов, принятых в рамках журнала. ...
О журнале . Журнал предназначен для оперативной публикации новых научных и практических результатов, полученных в области вычислительной математики и ее приложений (подробнее см. Тематика журнала ). ... Порядок рецензирования статей . ... Тематические рубрики журнала . Методы и алгоритмы вычислительной математики и их приложения для решения научно-технических задач . Программные средства и технологии для решения задач вычислительной математики и ее научно-технических приложений . ...