... An algorithm for solving transient problems of gravitational gas dynamics: a combination of the SPH method with a grid method of gravitational potential computation" . ... This algorithm is based on a combination of the meshless SPH (Smoothed Particle Hydrodynamics) method for gas dynamics and the convolution method for solving Poisson's equation on a Cartesian grid. ... The efficiency of the algorithm is demonstrated by numerical experiments on the formation of structures in a circumstellar disk. ...
... A parallel algorithm for solving 2D Poisson's equation in the context of nonstationary problems" . Snytnikov N.V. A new parallel method to solve the Dirichlet problem for Poisson's equation in the context of nonstationary problems of mathematical physics is proposed. ... Keywords: Poisson's equation, Dirichlet problem, domain decomposition, gravitational potential, stellar dynamics, parallel programming, scalability of algorithms. PDF (Full text in Russian, References in English) (281KB) . ...
... Regularization of multilingual topic models" . Dudarenko M.A. A multilingual probabilistic topic model based on the additive regularization ARTM allowing to combine both a parallel or comparable corpus and a bilingual translation dictionary is proposed. ... Keywords: multilingual topic model, probabilistic topic model, parallel corpus, comparable corpus, bilingual dictionary, regularization, cross-language search. ...
... A modification of the CABARET scheme for the computation of multicomponent gaseous flows" . Danilin A.V. and Solovjev A.V. An explicit numerical algorithm for computing one-dimensional motion of multicomponent gaseous mixtures is proposed. ... Keywords: one-velocity multicomponent medium, systems of hyperbolic equations, CABARET scheme, computational fluid dynamics (CFD), finite volume methods. PDF (Full text in Russian, References in English) (235KB) . ...
Порядок рецензирования рукописей, установленный редакцией . ... Все поступающие в редакцию статьи проходят этап предварительного отбора, который состоит в оценке соответствия статьи тематике журнала и ее общего научного уровня с точки зрения новизны изложенных результатов, их практической значимости и научной грамотности изложения. Мотивированное заключение о результате предварительного отбора высылается авторам. Статьи, прошедшие данный этап, направляются на анонимное рецензирование. ...
... Application of predictor-corrector finite-difference-based schemes in the lattice Boltzmann method" . Krivovichev G.V. and Voskoboinikova E.V. Predictor-corrector finite-difference-based lattice Boltzmann schemes are proposed. ... Krivovichev G.V. тАУ Saint Petersburg State University, Faculty of Applied Mathematics and Control Processes; prospekt Universitetskii 35, Saint Petersburg, 198504, Russia; Ph.D., Associate Professor, e-mail: gera1983k@bk.ru . ...
... An error estimate of a regularizing algorithm based of the generalized residual principle when solving integral equations" . Tanana V.P. and Sidikova A.I. A regularizing algorithm for the approximate solution of integral equations of the first kind is studied. ... An error estimate is proposed. ... Keywords: regularization, generalized residual method, modulus of continuity, error estimates, ill-posed problems, integral equations, operator equations, finite-dimensional approximations. ...
... Subpixel smoothing by floating grids for ring artifact reduction in fan-beam tomography" . ... A new method for suppressing such artifacts on the basis of subpixel smoothing by floating grids is proposed. ... Keywords: inverse problems, gas flow tomography, numerical algorithms, fan-beam tomography, tomogram artifacts, subpixel smoothing, Shepp-Logan filter. ...
... Supersonic flows of an inviscid compressible gas in aerodynamic windows of gas lasers" . Volkov K.N., Emelyanov V.N., and Pustovalov A.V. Development of mathematical modeling tools designed for calculations of supersonic flows in aerodynamic windows of gas lasers is considered. ... Volkov K.N. тАУ Ustinov Baltic State Technical University, Faculty of Power Engineering; ulitsa Pervaya Krasnoarmeiskaya 1, St. Petersburg, 190005, Russia; Dr. Sci., ...
... Mathematical modeling of multicomponent gas flows with energy intensive chemical processes by the example of ethane pyrolysis" . Stadnichenko O.A., Snytnikov V.N., and Snytnikov Vl.N. A mathematical model describing the three-dimensional gas flow dynamics in a laboratory reactor with diffusion, heat transfer and chemical reactions of the hydrocarbons pyrolysis with their thermal effects and thermal processes is proposed. ...
... An approach to the comparison of parallel program scalability" . Teplov A.M. An approach to the scalability analysis of parallel programs is proposed. ... An approach to the comparison of parallel program scalability based on the use of the scalability mark as a part of the parallel program scalability metric is described. ... Keywords: scalability, parallel computing, scalability analysis, comparison of scalability, scalability metrics, scalability mark, efficiency of parallel programs. ...
... Reduction of detailed schemes for chemical transformations of formaldehyde and hydrogen oxidation reactions based on a sensitivity analysis of a mathematical model" . ... The results of simulation are compared in the case of using a number of reduced and detailed schemes for formaldehyde and hydrogen oxidation reactions. Keywords: sensitivity analysis, mathematical model of reaction, formaldehyde oxidation reaction, hydrogen oxidation reaction, reduction of chemical reaction mechanisms. ...
... A probabilistic relation between the error estimates of physical quantities obtained by different methods" . ... A distribution function for the ratio of the error estimates of physical quantities calculated using the confidence region method (based on the chi-square statistics) to the errors estimates calculated using the least-squares method is obtained. ...
... Compression of fMRI data using wavelet tensor train decomposition" . Kharyuk P.V., єЮseledets I.V., and Ushakov V.L. The application of the Wavelet Tensor Train (WTT) decomposition to the compression of functional magnetic resonance imaging (fMRI) data is considered. ... Keywords: numerical tensor methods, Daubechies wavelet transform, wavelet tensor train decomposition, functional magnetic resonance imaging (fMRI) data, lossy data compression. ...
... Flow simulation by the lattice Boltzmann method with multiple-relaxation times" . Zakharov A.M., Senin D.S., and Grachev E.A. The lattice Boltzmann method with a multirelaxation collision integral is considered to simulate two-dimensional flows of an incompressible viscous Newtonian fluid. ... Keywords: computational fluid dynamics, lattice Boltzmann method, multiple-relaxation time, two-dimensional flows of Newtonian fluid, turbulent flows, Poiseuille flow, second Stokes problem. ...
... Arykov S.B., Malyshkin V.E. Main ideas of the high-level asynchronous parallel programming language and system are described. The system allows one to automatically construct parallel programs from the algorithm representation of high nonprocedurality. ... A brief overview of the Aspect programming language that allows the user to represent algorithms in nonprocedural form is given. ... PostScript (in Russian) (302KMB) . ... Arykov S.B., Malyshkin V.E. e-mail: arykov@mail.ru ; malysh@ssd.sscc.ru ...
Dynamic resources management of virtual appliances on a computational cluster" . ... Walker B.J. The virtual machine (VM) technology offers an increased flexibility in resource provisioning. The load for applications typically varies over time, justifying a need for the dynamic resource allocation/relinquish - exactly what the VM technology allows. We have devised an approach for the automated dynamic resource management of applications running on a computational cluster. ...
... Korzh A.A., Makagon D.V. Distributed shared memory systems with nonuniform memory access are considered. ... Minimum hardware requirement estimates is given for torus and Clos networks. ... PostScript (in Russian) (499KB) . PDF (in Russian) (156KB) . PostScript. zip (in Russian) (84.7KB) . PDF. zip (in Russian) (82.3KB) . Korzh A.A., Makagon D.V. e-mail: anton@korzh.ru ; makagond@mail.ru ...
Extreme metocean event simulation as a problem for high-performance computing" . Boukhanovsky A.V., Zilbershtein O.I., Ivanov S.V., Kovalchuk S.V., Lopatoukhin L.I., Popov S.K., Chumakov M.M. The design and development of high-performance computational software for the extreme metocean event simulation are considered. A performance model for this problem is proposed. ... PostScript (in Russian) (32.3MB) . PDF (in Russian) (1.23MB) . PostScript. zip (in Russian) (1.69MB) . ...