• Optimization Modelling of the Decarbonization Scenario of the Total Energy System of Kazakhstan until 2060 

  Zhakiyev, Nurkhat; Khamzina, Ayagoz; Zhakiyeva, Svetlana; Miglio, Rocco De; Bakdolotov, Aidyn; Cosmi, Carmelina (Energies, 2023)

  This research article provides a comprehensive scenario analysis of key structural changes in Kazakhstan’s fuel and energy complex subsectors until 2060, focusing on decarbonization efforts. The background places the ...
• On weighted integrability of the sum of series with monotone coefficients with respect to multiplicative systems 

  Turgumbaev, M.Zh.; Suleimenova, Z.R.; Tungushbaeva, D.I. (Bulletin of the Karaganda University. Mathematics Series, 2023)

  In this paper, we consider the questions about the weighted integrability of the sum of series with respect to multiplicative systems with monotone coefficients. Conditions are obtained for weight functions that ensure ...
• On the Resolvent Existence and the Separability of a Hyperbolic Operator with Fast Growing Coefficients in L2(R 2 ) 

  Muratbekova, Mussakan; Bayandiyev, Yerik (Faculty of Sciences and Mathematics, 2021)

  This paper studies the question of the resolvent existence, as well as, the smoothness of elements from the definition domain (separability) of a class of hyperbolic differential operators defined in an unbounded domain ...
• On the Fourier transform of functions from a Lorentz space L2,r with a mixed metric 

  Tleukhanova, N.T.; Mussabayeva, G.K.; Manarbek, M. (Bulletin of the Karaganda University. Mathematics Series, 2023)

  The classical inequalities of Bochkarev play a very important role in harmonic analysis. The meaning of these inequalities lies in the connection between the metric characteristics of functions and the summability of ...
• ON THE BOUNDEDNESS OF A GENERALIZED FRACTIONAL-MAXIMAL OPERATOR IN LORENTZ SPACES 

  Abek, А.N.; Turgumbayev, M.Zh.; Suleimenova, Z.R. (JMMCS, 2023)
• On quasi-identities of finite modular lattices. II 

  Basheyeva, A.O.; Lutsak, S.M. (Bulletin of the Karaganda University. Mathematics Series, 2023)

  The existence of a finite identity basis for any finite lattice was established by R. McKenzie in 1970, but the analogous statement for quasi-identities is incorrect. So, there is a finite lattice that does not have a ...
• On one integrable cosmological model of the flat universe in k-essence 

  Myrzakulov, K.R.; Kenzhalin, D.Zh.; Myrzakul, T.R. (International Journal of Mathematics and Physics, 2021)

  The study of the origin and evolution of our Universe is one of the interesting and actual directions in modern physics and astrophysics. This paper considers the cosmological model of the Universe in the Einstein's ...
• One-Dimensional Schrodinger Operator with a Negative Parameter and Its Applications to the Study of the Approximation Numbers of a Singular Hyperbolic Operator 

  Muratbekov, M.B.; Muratbekov, M.M. (Faculty of Sciences and Mathematics, 2018)

  In this paper we use the one-dimensional Schrodinger operator with a negative parameter to the ¨ study of the approximation numbers of a hyperbolic type singular operator. Estimates for the distribution function of the ...
• On the Feasibility of Interference Alignment in Compounded MIMO Broadcast Channels With Antenna Correlation and Mixed User Classes 

  Nauryzbayev, Galymzhan; Alsusa, Emad; Abdallah, Mohamed (IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY, 2018)

  This paper presents a generalized closed-form beamforming technique that can achieve the maximum degrees of freedom in compounded multiple-input multiple-output (MIMO) broadcast channels with mixed classes of multiple-antenna ...
• OBTAINING A FORMULA DESCRIBING THE INTERACTION OF FINE PARTICLES WITH AN EXPANDING GAS FLOW IN A FLUID LAYER 

  Alpeissov, Y.; Iskakov, R.,; Issenov, S; Ukenova, А (Eastern-European Journal of Enterprise Technologies, 2022)

  The interaction of fine particles with an expanding gas flow under fluidization conditions is considered. The objects of study are finely dispersed materials, their single particles, gas flow in a fluidized layer. ...
• Observational Constraints on F(T ,TG) Gravity with Hubble’s Parametrization 

  Shekh, Salim Harun; Myrzakulov, Nurgissa; Pradhan, Anirudh; Mussatayeva, Assem (Symmetry, 2023)

  Any new gravitational theories can be built with the help of a gauge theory with local Poincare symmetry. This local Poincare symmetry can set up a space-time with torsion. In the present study, the authors working on ...
• ON ITERATED DISCRETE HARDY TYPE OPERATORS 

  KALYBAY, AIGERIM; ZHANGABERGENOVA, NAZERKE (Operators and Matrices, 2023)

  The paper discusses a new iterated discrete inequality of Hardy type involving an operator with some matrix kernel. Under certain conditions on this matrix kernel, the given inequality is characterized.
• Note on quasivarieties generated by finite pointed abelian groups 

  Basheyeva, Ainur; Lutsak, Svetlana (De Gruyter proceedings in mathematics, 2024)

  We prove that a finite pointed abelian group generates a finitely axiomatizable variety that has a finite quasivariety lattice. As a consequence, we obtain that a quasivariety generated by a finite pointed abelian group ...
• EXISTENCE AND MAXIMAL REGULARITY OF SOLUTIONS IN L2(R 2 ) FOR A HYPERBOLIC TYPE DIFFERENTIAL EQUATION WITH QUICKLY GROWING COEFFICIENTS 

  Muratbekov, M.B.; Bayandiyev, Ye.N. (EURASIAN MATHEMATICAL JOURNAL, 2020)

  In this paper the problem of the existence of solutions is studied for a hyperbolic type differential equation defined in an unbounded domain. The problem of the smoothness of solutions is also considered here. Such ...
• MODIFICATION OF THE ONTOLOGY USING THE TEACHER’S PERSONAL MATERIALS TO INCREASE THE DEGREE OF AUTOMATION OF EC PREPARATION 

  Sabitova, N.,; Tikhonov, Y.,; Lakhno, V.,; Nyazova, R.,; Razakhova, B.,; Zholdasova, S.; Ospanova, T.; Taimuratova, L. (Eastern-European Journal of Enterprise Technologies, 2023)

  The object of the research is the technology of constructing a computer ontology (CO) for electronic textbooks of the subject area (KSA). As an example, the industry is consideredinformation and communication ...
• Modeling of a Catalytic Cracking in the Gasoline Production Installation with a Fuzzy Environment 

  Orazbayev, Batyr; Kozhakhmetova, Dinara; Wójtowicz, Ryszard; Krawczyk, Janusz (Energies, 2020)

  The article offers a systematic approach to the method of developing mathematical models of a chemical-technological system (CTS) in conditions of deficit and fuzziness of initial information using available data of ...
• Model companion properties of some theories 

  Kabidenov, A.; Kasatova, A.; Bekenov, M.I.; Markhabatov, N.D. (Bulletin of the Karaganda University. Mathematics Series, 2024)
• OSCILLATORY AND SPECTRAL PROPERTIES OF A CLASS OF FOURTH–ORDER DIFFERENTIAL OPERATORS VIA A NEW HARDY–TYPE INEQUALITY 

  OINAROV, RYSKUL; KALYBAY, AIGERIM; PERSSON, LARS-ERIK (Mathematical Inequalities & Applications, 2024)

  In this paper, we study oscillatory properties of a fourth-order differential equation and spectral properties of a corresponding differential operator. These properties are established by first proving a new second-order ...
• Metric-Affine Myrzakulov Gravity Theories 

  Myrzakulov, Nurgissa; Myrzakulov, Ratbay; Ravera, Lucrezia (Symmetry, 2021)

  In this paper, we review the so-called Myrzakulov Gravity models (MG-N, with N = I, II, . . . , VIII) and derive their respective metric-affine generalizations (MAMG-N), discussing also their particular sub-cases. The ...
• Methods of Fuzzy Multi-Criteria Decision Making for Controlling the Operating Modes of the Stabilization Column of the Primary Oil-Refining Unit 

  Orazbayev, Batyr; Ospanov, Yerbol; Makhatova, Valentina; Salybek, Lazzat; Abdugulova, Zhanat; Kulmagambetova, Zhumazhan; Suleimenova, Salamat; Orazbayeva, Kulman (Mathematics, 2023)

  Many technological systems are characterized by fuzzy initial information, necessary for the development of their models, optimization and control of operating modes. Therefore, the purpose of this study is to formulate ...

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