Mathematics: Недавние поступления

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    • Advanced Waste Management: Fast Pyrolysis Technology with Solid Heat Carrier for Municipal Solid Waste Processing 

      Sabitov, Ayat; Safarov, Ruslan; Salikhov, Ruslan; Petrov, Mikhail; Iskakova, Zhanar; Berdenov, Zharas; Mashan, Togzhan; Kusepova, Lyazat; Kopishev, Eldar; Aibuldinov, Yelaman (Engineered Science, 2025)
      Municipal solid waste (MSW) recycling is critical in addressing the environmental challenges posed by increasing urbanization and waste generation. This study explores the use of fast pyrolysis technology with solid heat carriers for efficient MSW processing. The technology, originally developed for oil shale processing, involves the thermal decomposition of waste in an ...
      2026-03-25

    • A Note on Pseudofinite Acyclic Graphs 

      Markhabatov, Nurlan D.; Baissalov, Yerzhan R. (THE BULLETIN OF IRKUTSK STATE UNIVERSITY». SERIES «MATHEMATICS, 2024)
      Acyclic graphs approximated by finite acyclic graphs are considered. It is proved that any countably categorical acyclic graph is smoothly approximable. An example of pseudofinite acyclic graph theory is given, which has an even, odd, and infinite number of rays.
      2026-03-25

    • Homogenization of attractors to reaction–diffusion equations in domains with rapidly oscillating boundary: Critical case 

      Azhmoldaev, Gaziz F.; Bekmaganbetov, Kuanysh A.; Chechkin, Gregory A.; Chepyzhov, Vladimir V. (Networks and Heterogeneous Media, 2024)
      In the present paper, reaction–diffusion systems (RD-systems) with rapidly oscillating coefficients and righthand sides in equations and in boundary conditions were considered in domains with locally periodic oscillating (wavering) boundary. We proved a weak convergence of the trajectory attractors of the given systems to the trajectory attractors of the limit (homogenized) ...
      2026-03-25

    • Explicit solutions of nonlocal reverse-time Hirota-Maxwell-Bloch system 

      Myrzakulova, Zh.; Zakariyeva, Z.; Suleimenov, K.; Uralbekova, U.; Yesmakhanova, K. (Mathematics, 2024)
      In this paper, we investigate the nonlocal reverse-time Hirota-Maxwell-Bloch system, focusing on its soliton solutions using the Darboux transformation method. By deriving the Darboux transformation for this system, we obtained explicit expressions for the new potentials q ′ , p ′ , and η ′ in both the defocusing (κ = 1) and focusing (κ = −1) cases. Our analysis reveals ...
      2026-03-25

    • The Current Status and Lost Biogas Production Potential of Kazakhstan from Anaerobic Digestion of Livestock and Poultry Manure 

      Yerassyl, Dulatbay; Jin, Yu; Sugirbaeva, Zhanar; Kazambayeva, Aigul; Yessengaliyeva, Saltanat (Energies, 2022)
      Kazakhstan has large reserves of natural resources, including coal, oil, and natural gas. We hope to replace fossil fuels with renewable sources of energy—particularly renewable natural gas. Thus, Kazakhstan, like other countries, should cut its dependency on coal, oil, and natural gas so as to reach net zero carbon emissions by 2050. This study, given that Kazakhstan is an ...
      2024-12-25

    • BOUNDEDNESS AND COMPACTNESS OF A CERTAIN CLASS OF MATRIX OPERATORS WITH VARIABLE LIMITS OF SUMMATION 

      Temirkhanova, A.M.; Beszhanova, A.T. (EURASIAN MATHEMATICAL JOURNAL, 2020)
      2024-12-25

    • TAME AND WILD AUTOMORPHISMS OF DIFFERENTIAL POLYNOMIAL ALGEBRAS OF RANK 2 

      Неизвестный автор (Journal of Mathematical Sciences, 2021)
      2024-12-25

    • Surfaces and Curves Induced by Nonlinear Schrödinger-Type Equations and Their Spin Systems 

      Myrzakul, Akbota; Nugmanova, Gulgassyl; Serikbayev, Nurzhan; Myrzakulov, Ratbay (Symmetry, 2021)
      In recent years, symmetry in abstract partial differential equations has found wide application in the field of nonlinear integrable equations. The symmetries of the corresponding transformation groups for such equations make it possible to significantly simplify the procedure for establishing equivalence between nonlinear integrable equations from different areas of physics, which ...
      2024-12-25

    • Supporting Multilingual Education with Computer Aided Instruction Applications 

      Rezuanova, G.; Bulatbayeva, K.; Smagulova, M.,; Tynybayeva, M.; Schnaider, V.; Zhukenova, A. (International Journal of Education in Mathematics, Science, and Technology, 2023)
      The purpose of this study is to examine the effect of computer-assisted instruction on the language achievement (Kazakh, English and Russian) and attitudes of university students who will work in general education schools in the future. In line with this purpose, pre-test post-test model with control group was applied in the study. The study group of the research consisted ...
      2024-12-25

    • Study of the Process of Packet Arrival at a Multiservice Node 

      Shingissov, Daniyar; Seilov, Shakhmaran; Goikhman, Vadim; Sokolov, Nikolai; Akhmetova, Zhanar; Uskenbayeva, Gulzhan; Rzayeva, Leila (Symmetry, 2022)
      The paper considers the main ways of describing the process that characterizes the arrival of packets to a multiservice node of a telecommunications network. The features of the process under consideration are best represented by the cumulative distribution function A(t). It determines the distribution of the interval size between the moments of arrival of neighboring packets ...
      2024-12-25

    • Spectrum of Primordial Gravitational Waves in Modified Gravities: A Short Overview 

      Odintsov, Sergei D.; Oikonomou, Vasilis K.; Myrzakulov, Ratbay (Symmetry, 2022)
      In this work, we shall exhaustively study the effects of modified gravity on the energy spectrum of the primordial gravitational waves background. S. Weinberg has also produced significant works related to the primordial gravitational waves, with the most important one being the effects of neutrinos on primordial gravitational waves. With this short review, our main aim is to ...
      2024-12-25

    • Some non-standard quasivarieties of lattices 

      Lutsak, S.M.; Basheyeva, A.O.; Asanbekov, A.M.; Voronina, O.A. (Bulletin of the Karaganda University. Mathematics Series, 2023)
      The questions of the standardness of quasivarieties have been investigated by many authors. The problem "Which finite lattices generate a standard topological prevariety?" was suggested by D.M. Clark, B.A. Davey, M.G. Jackson and J.G. Pitkethly in 2008. We continue to study the standardness problem for one specific finite modular lattice which does not satisfy all Tumanov’s ...
      2024-12-25

    • Some new Fourier inequalities for unbounded orthogonal systems in Lorentz–Zygmund spaces 

      Akishev, G.; Lukkassen, D.; Persson, L.E. (Journal of Inequalities and Applications, 2020)
      2024-12-25

    • SOME LOCAL WELL POSEDNESS RESULTS IN WEIGHTED SOBOLEV SPACE H1/3 FOR THE 3-KDV EQUATION 

      Castro, A.J.; Zhapsarbayeva, L.K. (KazNU Bulletin. Mathematics, Mechanics, Computer Science Series, 2023)
      The paper analyses the local well posedness of the initial value problem for the k-generalized Korteweg-de Vries equation for k = 3 with irregular initial data. k-generalized Korteweg-de Vries equations serve as a model of magnetoacoustic waves in plasma physics, of the nonlinear propagation of pulses in optical fibers. The solvability of many dispersive nonlinear equations has ...
      2024-12-25

    • Some Fourier inequalities for orthogonal systems in Lorentz–Zygmund spaces 

      Akishev, G.; Persson, L.E.; Seger, A. (Journal of Inequalities and Applications, 2019)
      A number of classical inequalities and convergence results related to Fourier coefficients with respect to unbounded orthogonal systems are generalized and complemented. All results are given in the case of Lorentz–Zygmund spaces.
      2024-12-25

    • Solution of one boundary value task of viscoelasticity in a nonlinear formulation, in the case of a cubic stress-strain relation 

      Dzhanmuldaev, B.D.; Janmuldayeva, A.B.; Jalbyrova, Zh.; Smakhanova, A.K.; Madelkhanova, A.Z. (International Journal of Mathematics and Physics, 2023)
      In this paper, the solution of a boundary value task in the nonlinear formulation is considered by the authors [1][2]. In spite of its proximity to linear theory, the nonlinear theory of viscoelasticityhas not yet been fully developed. This issue is far from being fully completed, since the existing calculation methods do not yet provide a complete answer to the many different ...
      2024-12-25

    • Solar-Powered Water Electrolysis Using Hybrid Solid Oxide Electrolyzer Cell (SOEC) for Green Hydrogen—A Review 

      Afroze, Shammya; Binti Sofri, Amal Najeebah Shalihah; Reza, Md Sumon; Iskakova, Zhanar Baktybaevna; Kabyshev, Asset; Kuterbekov, Kairat A.; Bekmyrza, Kenzhebatyr Z.; Taimuratova, Lidiya; Rakib Uddin, Mohammad; Azad, Abul K. (Energies, 2023)
      The depletion of fossil fuels in the current world has been a major concern due to their role as a primary source of energy for many countries. As non-renewable sources continue to deplete, there is a need for more research and initiatives to reduce reliance on these sources and explore better alternatives, such as renewable energy. Hydrogen is one of the most intriguing energy ...
      2024-12-25

    • Detection of the corner structures in 3D arrays using scalable masks 

      Kazantsev, I. G.; Mukhametzhanova, B. O.; Iskakov, K. T. (Siberian Electronic Mathematical Reports, 2021)
      Scalable masks for the selection of angular structures in three-dimensional (3D) digital images are considered, which are used in processing with a 3D window sliding over the image and convolved with image fragments. The model of scalable 3D mask was developed based on expanding smaller mask along its sides and edges. In this case, the submatrices remain unchanged, and new ...
      2024-12-25

    • Linearization of automorphisms and triangulation of derivations of free algebras of rank 2 

      Alimbaev, A. A.; Naurazbekova, A. S.; Kozybaev, D. Kh. (Siberian Electronic Mathematical Reports, 2019)
      We define a class of ◦-varieties of algebras and prove that the tame automorphism group of a free algebra of rank two of any ◦-variety of algebras over a field admits an amalgamated free product structure. In particular, the automorphism group of a free right-symmetric algebra of rank two admits an amalgamated free product structure. Using this structure, we prove that any ...
      2024-12-25

    • A wild automorphism of a free Novikov algebra 

      Duisengaliyeva, B. A.; Umirbaev, U. U.; Duisengaliyeva, B.A.; Umirbaev, U.U. (Siberian Electronic Mathematical Reports, 2018)
      B. A. Duisengaliyeva, U. U. Umirbaev, Duisengaliyeva, B.A., Umirbaev, U.U., A wild automorphism of a free Novikov algebra, Sib. Elektron. Mat. Izv. ` , 2018, Volume 15, 1671–1679
      2024-12-25