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2020
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2(98)/2020-Математика
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Browsing 2(98)/2020-Математика by Title

Browsing 2(98)/2020-Математика by Title

Now showing items 1-19 of 19

A boundary jumps phenomenon in the integral boundary value problem for singularly perturbed differential equations

Bukanay, N.U.; Mirzakulova, A.E.; Dauylbayev, M.K.; Konisbayeva, K.T. (KSU Publ., 2020-06-30)

The article is devoted to the study of the asymptotic behavior of solving an integral boundary value problem for a third-order linear differential equation with a small parameter for two higher derivatives, provided that ...
Bessel functions of two variables as solutions for systems of the second order differential equations

Tasmambetov, Zh.N.; Issenova, A.A. (KSU Publ., 2020-06-30)

In this paper, the systems with solutions in the form of degenerate hypergeometric Humbert functions of two variables reduced to Bessel functions of two variables are established and studied. The connections between the ...
Development of an algorithm for calculating the concentration of radiation defects during ion irradiation

Shmygaleva, T.A.; Konysbayeva, A.A. (KSU Publ., 2020-06-30)

The paper considers mathematical modeling of radiation defect formation processes in materials under ion irradiation. Algorithms for calculating cascade probability functions (CPF) taking into account energy, spectra of ...
Fuzzy Multi-criteria Selection of Alternatives by Quasi-best Case as the Basis for Choosing Robotic Machine-Assembling Technologies

Kyrylovych, V.A.; Dimitrov, L.V.; Melnychuk, P.P.; Belskiy, D.G.; Shadura, V.A.; Savkiv, V.B.; Kryzhanivska, I.V. (KSU Publ., 2020-06-30)

The process of choosing the robotic machine-assembling technologies (RMAT) is implemented as the fuzzy multi-criteria selection of alternatives by the suggested previousely method of quasi-best case. The basic concept ...
Generalization of one theorem of F. Riesz to some other spaces

Bitimkhan, S.; Alibieva, D.T. (KSU Publ., 2020-06-30)

It is known from the analysis course that in order a function to serve as an undefined integral of a summable function, it is necessary and sufficient that it be absolutely continuous. Therefore, it is natural to raise ...
Mapes of secondary sources in the problem of ERT probing 2D medium: numerical method and analytical solutions

Rakisheva, D.S.; Modin, I.N.; Mukanova, B.G. (KSU Publ., 2020-06-30)

The paper considers a mathematical model of electrical tomography above the media with local inclusions. Numerical solutions of a system of integral equations for a medium with local inclusion are compared against a ...
Model-theoretical questions of the Jonsson spectrum

Yeshkeyev, A.R. (KSU Publ., 2020-06-30)

In this paper, new concepts are defined in the framework of the study of Jonsson spectrum. We consider a spectrum with respect to the concept of cosemanticness, which is a generalization of elementary equivalence in the ...
Multiperiodic solution of linear hyperbolic in the narrow sense system with constant coefficients

Sartabanov, Zh.A.; Zhumagaziyev, A.Kh.; Abdikalikova, G.A. (KSU Publ., 2020-06-30)

There is researched existential problem of a unique multiperiodic in all independent variables solution of a linear hyperbolic in the narrow sense system of differential equations with constant coefficients and its ...
On boundary value problems for essentially loaded parabolic equations in bounded domains

Akhmanova, D.M.; Shamatayeva, N.K.; Kasymova, L.Zh. (KSU Publ., 2020-06-30)

In the paper we study issues of a strong solution for "essentially" loaded differential equations of the parabolic type in bounded domains. Features of the problems under consideration: for example, in the L2(Q) space ...
On Solonnikov-Fasano Problem for the Burgers Equation

Jenaliyev, M.T.; Ramazanov, M.I.; Assetov, A.A. (KSU Publ., 2020-06-30)

The paper is devoted to the questions of solvability in the Sobolev classes for boundary value problem for the Burgers equation with boundary conditions of the Solonnikov-Fasano type in degenerating domain with degenerate ...
On the parallel surfaces of the non-developable surfaces

Cakmak, Ali; Yaylı, Y. (KSU Publ., 2020-06-30)

In the differential geometry of curves and surfaces, the curvatures of curves and surfaces are often calculated and results are given. In particular, the results given by using the apparatus of the curve-surface pair ...
On the solution to a two-dimensional boundary value problem of heat conduction in a degenerating domain

Kosmakova, M.T.; Romanovski, V.G.; Akhmanova, D.M. (KSU Publ., 2020-06-30)

The article considers a homogeneous boundary-value problem for the heat equation in the non-cylindrical domain, namely, in an inverted pyramid with a vertex at the origin of coordinates, two faces of which lie in coordinate ...
On the spectral properties of a class of high-order differential operators with operator coefficients

Muratbekov, M.B.; Igisinov, S.Zh.; Musilimov, B.M.; Makulbekova, R.R. (KSU Publ., 2020-06-30)

In this paper, we study one class of high-order differential operators. The main feature of these operators is their nonsemi-boundedness. The dependence of operator coefficients on variables creates additional difficulties ...
Solution of inhomogeneous systems for differential equations in private derivatives of the third order

Tasmambetov, Zh.N.; Ubayeva, Zh.K. (KSU Publ., 2020-06-30)

The possibilities of constructing inhomogeneous system solutions for partial differential equations of the third order have been studied. The construction of general and particular solutions corresponding to homogeneous ...
Solvability of a semi-periodic boundary value problem for a third order differential equation with mixed derivative

Keldibekova, A.B. (KSU Publ., 2020-06-30)

This article is devoted to the study of the solvability of a semi-periodic boundary value problem for an evolution equation of the pseudoparabolic type. Nonlocal problems for high order partial differential equations ...
The Cauchy problem for the Navier-Stokes equations

Akysh (Akishev), A.Sh. (KSU Publ., 2020-06-30)

Ch. Fefferman in his works two problems for Navier-Stokes equations are set out: one of them is the Cauchy problem and he considers ¾only those solutions that are infinitely smooth functions are physically meaningful¿. ...
The first with displacement problem for a third-order parabolic-hyperbolic equation and the effect of inequality of characteristics as data carriers of the Tricomi problem

Balkizov, Zh.A.; Guchaeva, Z.Kh.; Kodzokov, A.Kh. (KSU Publ., 2020-06-30)

As part of this scientific work, we study a displacement boundary value problem for a third-order parabolichyperbolic type equation with a third-order parabolic equation backward in time and a wave equation in the domain ...
The hybrids of the ∆-PJ theories

Yeshkeyev, A.R.; Mussina, N.M. (KSU Publ., 2020-06-30)

When studying Jonsson theories, which are a wide subclass of inductive theories, it becomes necessary to study the so-called Jonsson sets. Similar problems are considered both in model theory and in universal algebra. ...
Wave field in a strip with symmetric located holes

Ashirbayev, N.; Ashirbayeva, Zh.; Shomanbayeva, M.; Altynbekov, Sh. (KSU Publ., 2020-06-30)

In the linear formulation, the problem of the propagation of unsteady stress waves in an elastic body with symmetrically located rectangular holes is considered. Formulated in terms of stresses and velocities, the mixed ...

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