Журнал СФУ. Математика и физика. Journal of SibFU. Mathematics & Physics: Новые ресурсы

Отображаемые элементы 1-20 из 1104

    • On the Stability of the Solutions of Inverse Problems for Elliptic Equations 

      Velisevich, Alexander V.; Lyubanova, Anna Sh.; Велисевич, Александр В.; Любанова, Анна Ш. (Journal of Siberian Federal University. Сибирский федеральный университет, 2024-05)
      The inverse problems on finding the unknown lower coefficient in linear and nonlinear second- order elliptic equations with integral overdetermination conditions are considered. The conditions of overdetermination are ...

    • Simulation of the Process of Frost Formation on the Surface of the Heat Exchanger Fin 

      Vasil’ev, Evgeniy N.; Васильев, Евгений Н. (Journal of Siberian Federal University. Сибирский федеральный университет, 2024-05)
      The paper considers the process of heat and mass transfer during the flow of moist air and formation of frost in the inter-fin space of an air heat exchanger at temperature below 0oC. The mathematical model is based on ...

    • On the p-fold Well-posedness of Higher Order Abstract Cauchy Problem 

      Toumi, Habiba; Nouar, Ahmed; Тоуми, Хабиба; Нуар, Ахмед (Journal of Siberian Federal University. Сибирский федеральный университет, 2024-05)
      In this paper, we establish sufficient conditions for the p-fold well-posedness of higher-order abstract Cauchy problem. These conditions are expressed in terms of decay of some auxiliary pencils derived from the ...

    • On Periodic Bilinear Threshold GARCH models 

      Slimani, Walid; Lescheb, Ines; Cherfaoui, Mouloud; Слимани, Валид; Лешеб, Инес; Шерфауи, Мулуд (Journal of Siberian Federal University. Сибирский федеральный университет, 2024-05)
      Periodic Generalized Autoregressive Conditionally Heteroscedastic (P GARCH) models were introduced by Bollerslev et Ghysels. These models have gained considerable interest and continued to attract the attention of ...

    • The Weighted Hardy Operators and Quasi-monotone Functions 

      Senouci, Abdelkader; Zanou, Abdelkader; Сенучи, Абделькадер; Зану, Абделькадер (Journal of Siberian Federal University. Сибирский федеральный университет, 2024-05)
      Some Hardy-type inequalities are established by W. T. Sulaiman. The aim of this work is to extend these inequalities for weighted Hardy operators with quasi-monotone functions. Moreover some new integral weighted ...

    • Admissible Inference Rules of Temporal Intransitive Logic with the Operator "tomorrow" 

      Rimatsky, Vitaliy V.; Ganchukova, Olga V.; Римацкий, Виталий В.; Ганчукова, Ольга В. (Journal of Siberian Federal University. Сибирский федеральный университет, 2024-05)
      We investigates non-transitive temporal logic with the "tomorrow" operator. In this logic, the operator "necessary" 2 coincides with the operator “possible” 3 (or almost coincides in reflexive case). In addition to the ...

    • On the Collection Formulas for Positive Words 

      Leontiev, Vladimir M.; Леонтьев, Владимир М. (Journal of Siberian Federal University. Сибирский федеральный университет, 2024-05)
      For any formal commutator R of a free group F , we constructively prove the existence of a logical formula ER with the following properties. First, if we apply the collection process to a positive word W of the group F ...

    • Equilibrium Problem for a Kirchhoff-Love Plate Contacting by the Side Edge and the Bottom Boundary 

      Lazarev, Nyurgun P.; Rudoy, Evgeny M.; Nikiforov, Djulustan Ya.; Лазарев, Нюргун П.; Рудой, Евгений М.; Никифоров, Дулустан Я. (Journal of Siberian Federal University. Сибирский федеральный университет, 2024-05)
      A new model of a Kirchhoff–Love plate which is in contact with a rigid obstacle of a certain given configuration is proposed in the paper. The plate is in contact either on the side edge or on the bottom surface. A ...

    • The Impact of Inclination Angle and Thermal Load on Flow Patterns in a Bilayer System Taking into Account the Mass Transfer 

      Laskovets, Ekaterina V.; Makarov, Evgeniy E.; Ласковец, Екатерина В.; Макаров, Евгений Е. (Journal of Siberian Federal University. Сибирский федеральный университет, 2024-05)
      Bilayer convective flows of liquid and gas-vapor mixture in an inclined channel are modeled taking into account the heat and mass transfer at the thermocapillary interface. Mathematical modeling is based on the exact ...

    • On the Real Roots of Systems of Transcendental Equations 

      Kytmanov, Alexander M.; Khodos, Olga V.; Кытманов, Александр М.; Ходос, Ольга В. (Journal of Siberian Federal University. Сибирский федеральный университет, 2024-05)
      The work is devoted to finding the number of real roots of systems of transcendental equa- tions. It is shown that if a system has simple roots, then the number of real coordinates of the roots is the same. Therefore, ...

    • Some Properties of the Automorphisms of the Classical Domain of the First Type in the Space C [m X n] 

      Khudayberganov, Gulmirza Kh.; Erkinboev, Kutlimurot S.; Худайберганов, Гулмирза Х.; Эркинбоев, Кутлимурот С. (Journal of Siberian Federal University. Сибирский федеральный университет, 2024-05)
      In this article we obtain an analogue of Theorem 2.2.2 from Rudin’s book [6] for classical Cartan domains of the first type

    • Collatz Hypothesis and Planck’s Black Body Radiation 

      Fabiano, Nicola; Mirkov, Nikola; Stojan Radenovi´c; Фабиано, Никола; Мирков, Никола; Стоян Раденович (Journal of Siberian Federal University. Сибирский федеральный университет, 2024-05)
      The Collatz conjecture is considered and the density of values is compared to Planck’s black body radiation, showing a remarkable agreement with each other. We also briefly discuss a generalisation of Collatz conjecture

    • Finding Power Sums of Zeros of an Entire Function of Finite Order of Growth 

      Djumabaev, Davlatbay; Джумабаев, Давлатбай (Journal of Siberian Federal University. Сибирский федеральный университет, 2024-05)
      Formulas are given for finding power sums of zeros to a negative power for entire functions of finite order of growth

    • On the Bipolar Classification of Endomorphisms of a Groupoid 

      Litavrin, Andrey V.; Литаврин, Андрей В. (Journal of Siberian Federal University. Сибирский федеральный университет, 2024-05)
      In this paper, a method is obtained for calculating the bipolar type of endomorphism of an arbitrary groupoid. For groupoids with pairwise distinct left translations of elements, the described method for calculating the ...

    • Approximate Solution to a Model of the far Momentumless Axisymmetric Turbulent Wake 

      Shmidt, Alexey V.; Шмидт, Алексей В. (Journal of Siberian Federal University. Сибирский федеральный университет, 2024-04)
      The flow in the far axisymmetric momentumless turbulent wake is described with the use of a mathematical model based on k − ε semi-empirical model of turbulence. A group-theoretical analysis of the mathematical model of ...

    • Analysis of the Electric Current Distribution in a Three-Layer Conductive Structure 

      Levitskiy, Alexey A.; Marinushkin, Pavel S.; Bakhtina, Valentina A.; Левицкий, Алексей А.; Маринушкин, Павел С.; Бахтина, Валентина А. (Journal of Siberian Federal University. Сибирский федеральный университет, 2024-04)
      The paper presents an analytical model allowing to investigate the electric current distribu- tion in a three-layer conductive structure. The proposed model takes into account the characteristics of the three conductive ...

    • Difference Equations and Hadamard Composition of Multiple Power Series 

      Leinartas, Evgeny D.; Leinartas, Evgeny K.; Лейнартас, Евгений Д.; Лейнартас, Евгений К. (Journal of Siberian Federal University. Сибирский федеральный университет, 2024-04)
      The sufficient conditions are given for the coefficients of two power series, which ensure the rationality of their Hadamard composition. Under certain additional constraints, the existence of a system of polynomial ...

    • Cylindrically Symmetric Generalized Ghost Pilgrim Dark Energy Cosmological Univers 

      Mandala Krishna; Sobhanbabu Kappala; Rajamahanthi Santhikumar; Мандала Кришна; Собханбабу Каппала; Раджамаханти Сантикумар (Journal of Siberian Federal University. Сибирский федеральный университет, 2024-04)
      The solution of the cylindrically symmetric Einstein Rosen universe is investigated and occupied with generalized ghost pilgrim dark energy and matter. To obtain the exact solutions of Einstein’s field equations, we ...

    • On a New Class of Integrals Involving Generalized Hypergeometric Functions 

      Adem Kilicman; Shantha Kumari Kurumujji; Arjun K. Rathie; Адем Киликман; Шанта Кумари Курумуджи; Арджун К. Рати (Journal of Siberian Federal University. Сибирский федеральный университет, 2024-04)
      In the theory of hypergeometric and generalized hypergeometric series, classical summation theorems such as those of Gauss, Gauss second, Bailey and Kummer for the series 2F1; Watson, Dixon, Whipple and Saalsh¨uz play a ...

    • Further Remarks on the Explicit Generating Function Expression of the Invariant Measure of Critical Galton-Watson Branching Systems 

      Imomov, Azam A.; Iskandarov, Sarvar B.; Имомов, Азам А.; Искандаров, Сарвар Б. (Journal of Siberian Federal University. Сибирский федеральный университет, 2024-04)
      Consider the critical Galton-Watson branching system with infinite variance of the offspring law. We provide an alternative arguments against what Slack [9] did when it seeked for a local expression in the neighborhood ...