共查询到20条相似文献,搜索用时 31 毫秒
1.
The direct solution of the vertical electrical sounding problem is considered for three-dimensional quasilayered media. An
efficient fast algorithm is obtained for computing the apparent resistivity curves in the two-dimensional case. A PC implementation
of the algorithm is proposed.
Translated from Obratnye Zadachi Estestvoznaniya, Published by Moscow University, Moscow, 1997, pp. 123–131. 相似文献
2.
V. I. Maksimov 《Computational Mathematics and Modeling》1997,8(3):217-225
The problem of estimating the right-hand side of a nonlinear parabolic equation is considered. A finite-step algorithm based
on the model positional control method and the finite element method is proposed. The algorithm is robust to informational
noise and computational errors.
Translated from Obratnye Zadachi Estestvoznaniya, Published by Moscow University, Moscow, 1997, pp. 23–33. 相似文献
3.
V. I. Dmitriev 《Computational Mathematics and Modeling》1997,8(3):270-277
We consider the inverse sounding problem for a stratified medium using the variable magnetic field of a loop. A uniqueness
theorem and a theorem ensuring stable determination of the integral conductivity of the medium are proved. An algorithm is
proposed for the solution of the inverse problem based on a transformation from the time domain to the frequency domain.
Translated from Obratnye Zadachi Estestvoznaniya, Published by Moscow University, Moscow, 1997, pp. 87–95. 相似文献
4.
E. V. Zakharov S. N. Levchenko Yu. Ya. Kharlanov 《Computational Mathematics and Modeling》1997,8(3):282-287
The article considers the mathematical model of a lens antenna in the shape of a homogeneous dielectric torus excited by an
axial magnetic dipole. The boundary-value problem for an elliptical differential equation is posed and reduced by the fundamental
solution method to an integral equation of 2nd kind over the torus section. A numerical algorithm is proposed, and the numerical
results are compared with experimental findings.
Translated from Obratnye Zadachi Estestvoznaniya, Published by Moscow University, Moscow, 1997, pp. 109–115. 相似文献
5.
The article considers the construction of a stable approximation of the basic component in an experimental spectrum. Conditions
of independence and nondegeneracy are introduced for the local resonance nonhomogeneities and the basic component, which is
treated as a continuous smooth function whose local variation is substantially less than the variation of the local nonhomogeneities.
The problem of approximating the basic component is shown to have a unique solution under these conditions. A stable algorithm
is developed for the construction of the basic component. The algorithm is applied to construct the basic component from typical
spectrometric data, and the results are compared with other known basic-component fitting methods.
Translated from Chislennye Metody v Matematicheskoi Fizike, Published by Moscow University, Moscow, 1996, pp. 137–146. 相似文献
6.
The paper considers the problem of determining the velocities of targets in the atmosphere given a set of Doppler spectra produced by continuous Doppler systems. The problem of determining the velocities of particles moving in a closed trajectory (a circle) is examined. A uniqueness theorem is proved for the reconstruction of velocities from two spectra. An algorithm is proposed for determining the sought function, and a numerical experiment is conducted to establish its efficiency.Translated from Matematicheskie Modeli Estestvoznaniya, Published by Moscow University, Moscow, 1995, pp. 162–167. 相似文献
7.
A simple mathematical model of the motion of a parachute system in space is described and an interactive algorithm for parametric identification of the model is proposed. The algorithm selects the model parameters that minimize the deviation of the calculated dependences from experimental observations on the computer graphic monitor.Moscow. Translated from Dinamicheskie Sistemy, No. 10, pp. 106–111, 1992. 相似文献
8.
Mathematical models are proposed for optimizing the structure of modular associative memory. Optimal hashing is considered.
The optimization problem is solved using a genetic algorithm.
Research supported by Ministry of Science grants 201.03.002 and 201.03.003.
Translated from Chislennye Metody i Vychislitel'nyi Eksperiment, Moscow State University, pp. 97–106, 1998. 相似文献
9.
E. E. Malyutina 《Computational Mathematics and Modeling》1999,10(4):393-404
A genetic algorithm is applied to compute the control of a complex dynamic system. Methods are proposed to modify the genetic
algorithm so as to adapt it to variation of the objective function. Comparison with dynamic programming results is carried
out.
The study was supported by the Russian Foundation of Basic Research (grant No. 9607-89110) and Ministry of Science (grants
0201.03.002 and 0201.03.003).
Translated from Chislennye Metody i Vychislitel'nyi Eksperiment, Moscow State University, pp. 82–96, 1998. 相似文献
10.
A. G. Aslanyan A. V. Gulin S. V. Kartyshov A. V. Shyarmokas 《Computational Mathematics and Modeling》1995,6(4):264-268
M. V. Lomonosov Moscow State University, Institute of Mathematical Modeling of Russian Academy of Sciences, Moscow. Translated from Matematicheskoe Modelirovanie, Published by Moscow University, Moscow, 1993, pp. 19–24. 相似文献
11.
A. S. Kholodov 《Computational Mathematics and Modeling》1995,6(4):235-241
Moscow Physico-Technical Institute. Translated from Matematicheskoe Modelirovanie, Published by Moscow University, Moscow, 1993, pp. 105–113. 相似文献
12.
Search for optimal routing (in the game-theoretical sense) in a packet data transmission network is considered. The proposed
method reduces the general problem to a particular problem of routing in ring networks. A fast parallel (distributed) algorithm
is constructed, which may be used in network-level data transmission protocols.
Translated from Chislennye Metody i Vychislitel'nyi Eksperiment, Moscow State University, pp. 107–123, 1998. 相似文献
13.
M. V. Lomonosov Moscow State University. Translated from Matematicheskoe Modelirovanie. Published by Moscow University, Moscow, 1993, pp. 279–295. 相似文献
14.
V. F. Butuzov A. B. Vasil'eva N. N. Nefedov 《Computational Mathematics and Modeling》1995,6(4):231-234
M. V. Lomonosov Moscow State University. Translated from Matematicheskoe Modelirovanie, Published by Moscow University, Moscow, 1993, pp. 63–67. 相似文献
15.
An algorithm is proposed to construct a sequence of evolutionary adaptive grids, each consisting of segments of uniform grids
compatible with the Richardson extrapolation procedure. The necessary numerical accuracy is achieved by using Richardson's
extrapolation method to increase the accuracy of the difference solution and by controlling the nonhomogeneity parameter on
passing from one segment to the next. The numerical model used in the article is the diffusion-convection equation, whose
solution contains large gradients. Numerical calculations show that the algorithm attains the prespecified accuracy on a nonuniform
difference grid. Numerical examples support the universality of the proposed algorithm. High accuracy results can be obtained
without changing the structure of the difference schemes approximating the original problem; only the grid spacing has to
be changed.
Translated from Chislennye Metody v Matematicheskoi Fizike, Moscow State University, pp. 22–36, 1998. 相似文献
16.
Leon Cooper 《Historia Mathematica》2011,38(4):455-484
It has been at various times proposed in regard to Problem 10 of the Moscow Mathematical Papyrus that Egyptian scribes had developed a computational algorithm by which they could calculate the circumference of a circle of known diameter length. It has also been proposed at various times that the 7:22 ratio between a circle’s diameter and its circumference was known by the Egyptian scribes at a surprisingly early period.The present paper explores currently available evidence that lends support to each of these propositions. 相似文献
17.
This article examines some aspects of the one-dimensional inverse problem of magnetotelluric sounding. A uniqueness theorem
is proved in the presence ofS-surfaces. A numerical algorithm based on transformation formulas is proposed.
This research was partially supported by Russian Foundation for Basic Research (grant No. 96-01-00410) and by the State Scientific-Technical
Program “Future Information Technologies” (grant No. 0201.06.010).
Translated from Chislennye Metody v Matematicheskoi Fizike, Moscow State University, pp. 53–66, 1998. 相似文献
18.
A. A. Frolov E. V. Chizhonkov 《Computational Mathematics and Mathematical Physics》2017,57(11):1808-1821
A numerical asymptotic model for the breaking of two-dimensional plane relativistic electron oscillations under a small deviation from axial symmetry is developed. The asymptotic theory makes use of the construction of time-uniformly applicable solutions to weakly nonlinear equations. A special finite-difference algorithm on staggered grids is used for numerical simulation. The numerical solutions of axially symmetric one-dimensional relativistic problems yield two-sided estimates for the breaking time. Some of the computations were performed on the “Chebyshev” supercomputer (Moscow State University). 相似文献
19.
A. G. Kolesnik S. S. Korolev M. D. Kaminskaya 《Computational Mathematics and Modeling》1995,6(4):290-301
Tomsk State University. Translated from Matematicheskoe Modelirovanie, Published by Moscow University, Moscow, 1993, pp. 122–138. 相似文献
20.
Moscow Mathematical Institute. Independent Moscow University. Translated from Funktsional'nyi Analiz i Ego Prilozheniya, Vol. 28, No. 1, pp. 68–90, January–March, 1994. 相似文献