Electronic catalog
Start with O
Genre:Естественные науки (natural_sciences)
Search result:
61-70 of 104
periodical press (Magazines)
OMAROVA B. ZH.
Omarova, B. Zh. On multiperiodic solutions of perturbed nonlinear autonomous systems with the differentiation operator on a vector field [Text] / B. Zh. Omarova, Zh. A. Sartabanov // Eurasian Mathematical Journal. - 2021. - V. 12, № 1. - p. 68-81. ISSN 2077-9879.
UDC:
517.988.6
Subject headings
- Nonlinear autonomous
Annotation
A quasilinear system with the differentiation operator with respect to the directions of vector fields specified by Lyapunov's system with respect to space independent variables and a multiperiodic system with respect to time variables is considered
Keywords
multiperiodic solutions, autonomous system, differentiation operator, Lyapunov's vector field, perturbation
Kazakhstan
0/0 Free
periodical press (Magazines)
KIM L. V.
Kim, L. V. On the jumping spider (Araneae, Salticidae) fauna of Almaty city (Republic of Kazakhstan) [Text] / L. V. Kim, M. Ye. Salmenova , A. B. Yeszhanov // Қарағанды университетінің хабаршысы. Биология. Медицина. География сериясы. - 2023. - № 3 (111). - P. 99-104. - Bibliogr.: p. 103-104 ISSN 2518-7201.
UDC:
595.444.4
Subject headings
- Salticidae. Jumping spiders
Annotation
This study provides new records of some jumping spider species from Almaty city
Keywords
Aranei, fauna, spider fauna, spiders, environmental community
Kazakhstan
0/0 Free
periodical press (Magazines)
AIDA-ZADE K. R.
Aida-zade, K. R. On the class of pointwise and integrally loaded differential equations [Text] / K. R. Aida-zade, V. M. Abdullayev // Қарағанды университетінің хабаршысы. Математика сериясы. - 2024. - № 1 (113). - P. 5-27. - Bibliogr.: p. 16-17 ISSN 2518-7929.
UDC:
517.9
Subject headings
- Differential equations. Integral equations
Annotation
The paper describes the application of the method using the example of solving a test model problem
Keywords
integro-differential equation, system of loaded equations, integral conditions, conditions of existenceand uniqueness, интегралдық-дифференциалдық теңдеу, интегро-дифференциальное уравнение
Kazakhstan
0/0 Free
periodical press (Magazines)
AKYLBAYEV M. I.
Akylbayev, M. I. On some estimations of deviations between real solution andnumerical solution of dynamical equations with regard for Baumgarteconstraint stabilization [Text] / M. I. Akylbayev, I. E. Kaspirovich // Қарағанды университетінің хабаршысы. Математика сериясы. - 2024. - № 1 (113). - P. 21-27. - Bibliogr.: p. 25-26 ISSN 2518-7929.
UDC:
517.9
Subject headings
- Differential equations. Integral equations
Annotation
The paper considers the estimation of the error of the numerical solution obtained by the first-order Euler method
Keywords
constraint stabilization, numerical integration, system of differential levels, numerical solution, difference scheme, байланыстарды тұрақтандыру, сандық интегралдау, стабилизация связей, численное интегрирование
Kazakhstan
0/0 Free
periodical press (Magazines)
AKISHEV G.
Akishev, G. On estimates of M-term approximations of the Sobolev class in the Lorentz space [Text] / G. Akishev, A. Kh. Myrzagaliyeva // Қарағанды университетінің хабаршысы. Математика сериясы. - 2024. - № 2 (114). - P. 4-21. - Bibliogr.: p. 17-18 ISSN 2518-7929.
UDC:
517.518.4
Subject headings
- Trigonometric series
Annotation
In the paper spaces of periodic functions of several variables were considered, namely the Lorentz space L2; (Tm), the class of functions with bounded mixed fractional derivative Wr 2; , 1 < 1, and the order of the best M-term approximation of a function f 2 Lp; (Tm) by trigonometric polynomials was studied
Keywords
Lorentz space, Sobolev class, mixed derivative, trigonometric polynomial, M-term approximation, Лоренц кеңiстiгi, Соболев класы, пространство Лоренца, класс Соболева
Kazakhstan
0/0 Free
periodical press (Magazines)
DEKHKONOV F. N.
Dekhkonov, F. N. On the time-optimal control problem for a fourth order parabolicequation in a two-dimensional domain [Text] / F. N. Dekhkonov // Қарағанды университетінің хабаршысы. Математика сериясы. - 2024. - Vol. 29, № 2 (114). - P. 57-70. - Bibliogr.: p. 66-68 ISSN 2518-7929.
UDC:
517.956.4
Subject headings
- Parabolic equations and systems
Annotation
In this paper, a boundary control problem associated with a fourth-order parabolic equationin a bounded two-dimensional domain was considered
Keywords
initial-boundary problem, fourth-order parabolic equation, admissible control, Volterra integral equation, Laplace transform method, төртiншi реттi параболалық теңдеу, параболическое уравнение четвертого порядка
Kazakhstan
0/0 Free
periodical press (Magazines)
JENALIYEV M. T.
Jenaliyev, M. T. On the spectral problem for three-dimesionalbi-Laplacian in the unit sphere [Text] / M. T. Jenaliyev, A. M. Serik // Қарағанды университетінің хабаршысы. Математика сериясы. - 2024. - Vol. 29, № 2 (114). - P. 86-104. - Bibliogr.: p. 98-100 ISSN 2518-7929.
UDC:
517.9
Subject headings
- Differential equations. Integral equations
Annotation
In this work, a new concept of the stream function and derive the equation for the streamfunction in the three-dimensional case was introduced
Keywords
Navier-Stokes system, bi-Laplacian, spectral problem, stream function, Навье-Стокс жүйесi, би-Лапласиан, cистема Навье-Стокса
Kazakhstan
0/0 Free
periodical press (Magazines)
KALMENOV T. SH.
Kalmenov, T. Sh. On a method for constructing the Green function of the Dirichletproblem for the Laplace equation [Text] / T. Sh. Kalmenov // Қарағанды университетінің хабаршысы. Математика сериясы. - 2024. - № 2 (114). - P. 105-113. - Bibliogr.: p. 110-111 ISSN 2518-7929.
UDC:
517.9
Subject headings
- Differential equations. Integral equations
Annotation
In this work, using the boundary condition of the Newtonian (volume)potential and the spectral property of the potential of a simple layer, the Green function of the Dirichletproblem for the Laplace equation was constructed
Keywords
Laplace equation, Green function, Dirichlet problem, simple layer potential, Лaплaс теңдеуi, Грин функциясы, Дирихле есебi
Kazakhstan
0/0 Free
periodical press (Magazines)
SULEIMBEKOVA A. O.
Suleimbekova, A. O. On the existence and coercive estimates of solutions to the Dirichletproblem for a class of third-order differential equations [Text] / A. O. Suleimbekova, B. M. Musilimov // Қарағанды университетінің хабаршысы. Математика сериясы. - 2024. - Vol. 29, № 2 (114). - P. 178-185. - Bibliogr.: p. 183 ISSN 2518-7929.
UDC:
517.9
Subject headings
- Differential equations. Integral equations
Annotation
In this paper, the properties of solutions of а class of the third order degenerate partial differential equations with variable coefficients given in a rectangle were studied
Keywords
resolvent, third order differential equation, Dirichlet problem, coercive estimates, дифференциалдық теңдеулер, Дирихле есебі, дифференциальные уравнения, задача Дирихле
Kazakhstan
0/0 Free
periodical press (Magazines)
KHAYITOV O. G.
Khayitov, O. G. On some results of studying the causes of anomalously high formation pressure on the hydrocarbons deposits of the Bashkent deep [Text] / O. G. Khayitov, A. A. Umirzokov , Sh. Sh. Turdiev [et al.] // Қазақстан Республикасы Ұлттық ғылым академиясының хабарлары. Геология және техникалық ғылымдар сериясы. - 2022. - № 6 (456). - P. 247-260. - Bibliogr.: p. 259-260 ISSN 2224-5278.
UDC:
553.982.2
Subject headings
- Oil fields
Annotation
The object of study is the Beshkent trough of the Bukhara Khiva region (BHR), which is the most promising for discovering new hydrocarbon deposits
Keywords
oil and gas potential, hydrocarbons deposits, field, density, porosity, tectonics
Kazakhstan
0/0 Free
OMAROVA B. ZH.
ON MULTIPERIODIC SOLUTIONS OF PERTURBED NONLINEAR AUTONOMOUS SYSTEMS WITH THE DIFFERENTIATION OPERATOR ON A VECTOR FIELD
periodical press (Magazines)
0/0 Free
KIM L. V.
ON THE JUMPING SPIDER (ARANEAE, SALTICIDAE) FAUNA OF ALMATY CITY (REPUBLIC OF KAZAKHSTAN)
periodical press (Magazines)
0/0 Free
AIDA-ZADE K. R.
ON THE CLASS OF POINTWISE AND INTEGRALLY LOADED DIFFERENTIAL EQUATIONS
periodical press (Magazines)
0/0 Free
AKYLBAYEV M. I.
ON SOME ESTIMATIONS OF DEVIATIONS BETWEEN REAL SOLUTION ANDNUMERICAL SOLUTION OF DYNAMICAL EQUATIONS WITH REGARD FOR BAUMGARTECONSTRAINT STABILIZATION
periodical press (Magazines)
0/0 Free
AKISHEV G.
ON ESTIMATES OF M-TERM APPROXIMATIONS OF THE SOBOLEV CLASS IN THE LORENTZ SPACE
periodical press (Magazines)
0/0 Free
DEKHKONOV F. N.
ON THE TIME-OPTIMAL CONTROL PROBLEM FOR A FOURTH ORDER PARABOLICEQUATION IN A TWO-DIMENSIONAL DOMAIN
periodical press (Magazines)
0/0 Free
JENALIYEV M. T.
ON THE SPECTRAL PROBLEM FOR THREE-DIMESIONALBI-LAPLACIAN IN THE UNIT SPHERE
periodical press (Magazines)
0/0 Free
KALMENOV T. SH.
ON A METHOD FOR CONSTRUCTING THE GREEN FUNCTION OF THE DIRICHLETPROBLEM FOR THE LAPLACE EQUATION
periodical press (Magazines)
0/0 Free
SULEIMBEKOVA A. O.
ON THE EXISTENCE AND COERCIVE ESTIMATES OF SOLUTIONS TO THE DIRICHLETPROBLEM FOR A CLASS OF THIRD-ORDER DIFFERENTIAL EQUATIONS
periodical press (Magazines)
0/0 Free
KHAYITOV O. G.
ON SOME RESULTS OF STUDYING THE CAUSES OF ANOMALOUSLY HIGH FORMATION PRESSURE ON THE HYDROCARBONS DEPOSITS OF THE BASHKENT DEEP
periodical press (Magazines)
0/0 Free