Результаты поиска по 'modeling':
Найдено статей: 781
  1. Lobanov A.I.
    Scientific and pedagogical schools founded by A. S. Kholodov
    Computer Research and Modeling, 2018, v. 10, no. 5, pp. 561-579

    In the science development an important role the scientific schools are played. This schools are the associations of researchers connected by the common problem, the ideas and the methods used for problems solution. Usually Scientific schools are formed around the leader and the uniting idea.

    The several sciences schools were created around academician A. S. Kholodov during his scientific and pedagogical activity.

    This review tries to present the main scientific directions in which the bright science collectives with the common frames of reference and approaches to researches were created. In the review this common base is marked out. First, this is development of the group of numerical methods for hyperbolic type systems of partial derivatives differential equations solution — grid and characteristic methods. Secondly, the description of different numerical methods in the undetermined coefficients spaces. This approach developed for all types of partial equations and for ordinary differential equations.

    On the basis of A. S. Kholodov’s numerical approaches the research teams working in different subject domains are formed. The fields of interests are including mathematical modeling of the plasma dynamics, deformable solid body dynamics, some problems of biology, biophysics, medical physics and biomechanics. The new field of interest includes solving problem on graphs (such as processes of the electric power transportation, modeling of the traffic flows on a road network etc).

    There is the attempt in the present review analyzed the activity of scientific schools from the moment of their origin so far, to trace the connection of A. S. Kholodov’s works with his colleagues and followers works. The complete overview of all the scientific schools created around A. S. Kholodov is impossible due to the huge amount and a variety of the scientific results.

    The attempt to connect scientific schools activity with the advent of scientific and educational school in Moscow Institute of Physics and Technology also becomes.

    Views (last year): 42.
  2. The 3rd BRICS Mathematics Conference
    Computer Research and Modeling, 2019, v. 11, no. 6, pp. 1015-1016
  3. Korchak A.B., Evdokimov A.V.
    Tool for integration of heterogeneous models and its application to loosely coupled sets of differential equations
    Computer Research and Modeling, 2009, v. 1, no. 2, pp. 127-136

    We develop the software tool for integration of dynamics models, which are inhomogeneous over mathematical properties and/or over requirements to the time step. The family of algorithms for the parallel computation of heterogeneous models with different time steps is offered. Analytical estimates and direct measurements of the error of these algorithms are made with reference to weakly coupled ODE sets. The advantage of the algorithms in the time cost as compared to accurate methods is shown.

    Views (last year): 1.
  4. Borisov A.V., Trifonov A.Y., Shapovalov A.V.
    Semiclassical solutions localized in a neighborhood of a circle for the Gross–Pitaevskii equation
    Computer Research and Modeling, 2009, v. 1, no. 4, pp. 359-365

    Non-collapsing soliton-like wave functions are shown to exist in semiclassical approximation for the Bose-Einstein condensate model based on the Gross–Pitaevskii equation with attractive nonlinearity and external field of magnetic trap of special form.

    Citations: 1 (RSCI).
  5. Gaiko V.A.
    Global bifurcation analysis of a quartic predator–prey model
    Computer Research and Modeling, 2011, v. 3, no. 2, pp. 125-134

    We complete the global bifurcation analysis of a quartic predator–prey model. In particular, studying global bifurcations of singular points and limit cycles, we prove that the corresponding dynamical system has at most two limit cycles.

    Views (last year): 5. Citations: 3 (RSCI).
  6. The paper develops a theory of a new so-called two-parametric approach to the random signals' analysis and processing. A mathematical simulation and the task solutions’ comparison have been implemented for the Gauss and Rice statistical models. The applicability of the Rice statistical model is substantiated for the tasks of data and images processing when the signal’s envelope is being analyzed. A technique is developed and theoretically substantiated for solving the task of the noise suppression and initial image reconstruction by means of joint calculation of both statistical parameters — an initial signal’s mean value and noise dispersion — based on the maximum likelihood method within the Rice distribution. The peculiarities of this distribution’s likelihood function and the following from them possibilities of the signal and noise estimation have been analyzed.

    Views (last year): 2. Citations: 4 (RSCI).
  7. Skalko Y.I., Karasev R.N., Akopyan A.V., Tsybulin I.V., Mendel M.A.
    Space-marching algorithm for solving radiative transfer problem based on short-characteristics method
    Computer Research and Modeling, 2014, v. 6, no. 2, pp. 203-215

    A procedure of approximate solving of the radiation transfer problem is presented. The approximated solution is being built successively from the domain border along the direction of radiation propagation. The algorithm was tested for model problem of hot ball radiation.

    Views (last year): 10. Citations: 3 (RSCI).
  8. Lopato A.I., Utkin P.S.
    Mathematical modeling of pulsating detonation wave using ENO-schemes of different approximation orders
    Computer Research and Modeling, 2014, v. 6, no. 5, pp. 643-653

    The results of the numerical investigations of pulsating detonation wave propagation using the ENO-schemes with the approximation orders from the first to the fourth inclusively are presented. The results obtained with the use of the schemes of different approximation orders demonstrate that the pattern of detonation wave propagation in acetylene-air mixture corresponds to the analytical estimates both qualitatively and quantitatively. For the hydrogen-air mixture none of the schemes concerned provides the stable detonation wave propagation. The transition from the regular mode to the marginal one with the subsequent detonation breakup is observed.

    Views (last year): 4. Citations: 5 (RSCI).
  9. Zhluktov S.V., Aksenov A.A., Karasev P.I.
    Modeling bypass transition within $k-\varepsilon$ approach
    Computer Research and Modeling, 2014, v. 6, no. 6, pp. 879-888

    This article is dedicated to investigation of the possibility to predict bypass transition by means of an unsophisticated low-Reynolds $k-\varepsilon$ turbulence model. Such a model has been developed at TESIS Ltd. The model is implemented in the FlowVision software suit. The ideas implemented in the model are discussed in the article. The capability of the model to predict bypass transition is demonstrated on well-known test cases T3B, T3A, T3A-.

    Views (last year): 11. Citations: 8 (RSCI).
  10. Breev A.I., Shapovalov A.V.
    Vacuum polarization of scalar field on Lie groups with Bi-invariant metric
    Computer Research and Modeling, 2015, v. 7, no. 5, pp. 989-999

    We consider vacuum polarization of a scalar field on the Lie groups with a bi-invariant metric of Robertson-Walker type. Using the method of orbits we found expression for the vacuum expectation values of the energy-momentum tensor of the scalar field which are determined by the representation character of the group. It is shown that Einstein’s equations with the energy-momentum tensor are consistent. As an example, we consider isotropic Bianchi type IX model.

    Views (last year): 2.
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