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Linearization of the Riemann problem for a triangular system of conservation laws and delta shock wave formation process
Mathematical Methods in Applied Sciences. 2010. Vol. 33. P. 904-921.
Using the weak asymptotic method, we approximate a triangular system of conservation laws arising from the so-called generalized pressureless gas dynamics by a diagonal linear system. Then, we apply the usual method of characteristics to find approximate solution to the original system. As a consequence, we shall see how the delta shock wave naturally arises along the characteristics. Also, we propose a procedure that could be applied to more general systems of conservation laws.
Danilov V., Mitrovic D., Quarterly of Applied Mathematics 2011 Vol. LXIX No. 4 P. 613-634
We construct a global smooth approximate solution to a multidimensional scalar conservation law describing the shock wave formation process for initial data with small variation. In order to solve the problem, we modify the method of characteristics by introducing “new characteristics”, nonintersecting curves along which the (approximate) solution to the problem under study is constant. ...
Added: April 12, 2012
Samovol V. S., Математические заметки 2012 Т. 92 № 5 С. 731-746
In a neighborhood of a singular point, we consider autonomous systems of ordinary differential equations such that the matrix of the linearized system has two pure imaginary eigenvalues, all other eigenvalues lying outside the imaginary axis. The reducibility of such systems to pseudonormal form is studied. ...
Added: December 13, 2012
Ivashov E., Князева М. П., Костомаров П. С. et al., Международный журнал экспериментального образования 2014 Т. 2 № 1 С. 105-108
The problem of small sample size, i.e. absence of required quantity of empirical data for decision making of rational constructive-technically, in case of computer-aided design of elements, nodes and technical objects’ devices is considered. Randomization approach for blur factor’s determination of nonparametric decision rules is suggested. The approach of Laplace’s method in using cores’ asymptotic ...
Added: January 25, 2014
Lomonosov T., Journal of Mathematical Sciences 2021 Vol. 255 No. 4 P. 459-466
We propose an algorithm for linearizing systems of partial differential equations at constant solutions. The algorithm is based on an isomorphism constructed between the ring of linearized functions and the ring of special matrices, which makes it possible to simplify calculations in the process of linearization. The algorithm is illustrated by applying it to the ...
Added: May 9, 2021
Helminck G. F., Poberezhny V. A., Polenkova S. V., Theoretical and Mathematical Physics 2020 Vol. 204 No. 3 P. 1140-1153
We show that both the dKP hierarchy and its strict version can be extended to a wider class of deformations satisfying a larger set of Lax equations. We prove that both extended hierarchies have appropriate linearizations allowing a geometric construction of their solutions. ...
Added: October 28, 2020
Vlasenko S. V., В кн. : Слово. Текст: психолингвистический подход. Вып. 13.: Тверь : Тверской государственный университет, 2013. С. 87-98.
The article reviews a possible correlation of perception patterns employed by translators of original English subject-specific texts and the subsequent text generation in line with syntactic conventions recognized in the target language. Syntactic adequacy of text structures generated in the target language is addressed, as well as related complexities. Relative syntactic acceptability of a translation ...
Added: December 8, 2013
Zlotnik A., Четверушкин Б. Н., Дифференциальные уравнения 2020 Т. 56 № 7 С. 936-947
Рассматривается многомерная гиперболическая квазигазодинамическая система дифференциальных уравнений 2-го порядка по времени и пространству, линеаризованная на постоянном решении (с произвольной скоростью). Для линеаризованной системы с постоянными коэффициентами изучаются неявные трехслойная с весом и двухслойная векторная разностные схемы. Выводится важное свойство преобладания оператора вязких слагаемых (без учета параметра релаксации) над оператором конвективных слагаемых. С его применением для начально-краевой задачи энергетическим методом ...
Added: January 15, 2020
Samovol V. S., Математические заметки 2012 Т. 92 № 6 С. 912-927
In a neighborhood of a singular point, we consider autonomous systems of ordinary differential equations such that the matrix of the linearized system has two pure imaginary eigenvalues, all other eigenvalues lying outside the imaginary axis. The problem of local finitely smooth equivalence of such systems is studied. ...
Added: December 13, 2012
Akhmetsafina R., Ахметсафин Р. Д., Мехатроника, автоматизация, управление 2014 № 2 (155) С. 14-18
This paper considers a scheme of linearizing compensator for parallel Hammerstein model. The compensator exactly linearizes the system
via the internal feedback without truncation of Volterra series. Using the compensator with online identification determines adaptive linearization ...
Added: February 17, 2014
Arkhipova M., В кн. : Эконометрика. : М. : Проспект, 2011. Гл. 7. С. 178-215.
Рассматриваются основные приемы и методы построения нелинейных регрессионных моделей и их линеаризация. ...
Added: February 26, 2013
Zlotnik A., Математическое моделирование 2012 Т. 24 № 4 С. 65-79
Дан краткий подход к построению баротропной квазигазодинамической (КГД) системы уравнений с помощью специальной регуляризации по времени баротропной системы уравнений Навье-Стокса вязкого сжимаемого газа. Этот подход обобщен на случай КГД системы с общими уравнениями состояния газа, массовой силой и источником тепла. Для баротропной КГД системы с потенциальной массовой силой выведено поточечное уравнение энергетического баланса. В качестве ...
Added: June 30, 2012
Zlotnik A., Fedchenko A., / Институт прикладной математики им. М.В. Келдыша Российской академии наук. Серия "Препринты ИПМ им. М.В. Келдыша". 2021. № 77.
Added: November 11, 2021
Zlotnik A.A., Chetverushkin B. N., Differential Equations 2020 Vol. 56 No. 7 P. 910-922
We consider a multidimensional hyperbolic quasi-gasdynamic system of differential equations of the second order in time and space linearized at a constant solution (with an arbitrary velocity). For the linearized system with constant coefficients, we study an implicit three-level weighted difference scheme and an implicit two-level vector difference scheme. The important domination property of the operator of ...
Added: July 16, 2020
191574970, Functional Analysis and Its Applications 2006 Vol. 40 No. 2 P. 81-90
It is well known that every module M over the algebra ℒ(X) of operators on a finite-dimensional space X can be represented as the tensor product of X by some vector space E, M ≅ = E ⊗ X. We generalize this assertion to the case of topological modules by proving that if X is a stereotype space with the stereotype approximation property, then for each stereotype module M over the ...
Added: September 23, 2016
Losev A. S., Slizovskiy S., JETP Letters 2010 Vol. 91 P. 620-624
Added: February 27, 2013
Ilyashenko Y., Яковенко С. Ю., М. : МЦНМО, 2013
Предлагаемая книга—первый том двухтомной монографии, посвящённой аналитической теории дифференциальных уравнений.
В первой части этого тома излагается формальная и аналитическая теория нормальных форм и теорема о разрешении особенностей для векторных полей на плоскости.
Вторая часть посвящена алгебраически разрешимым локальным задачам теории аналитических дифференциальных уравнений , квадратичным векторным полям и проблеме локальной классификации ростков векторных полей в комплексной области ...
Added: February 5, 2014
Kalyagin V.A., Koldanov A.P., Koldanov P.A. et al., Physica A: Statistical Mechanics and its Applications 2014 Vol. 413 No. 1 P. 59-70
A general approach to measure statistical uncertainty of different filtration techniques for market network analysis is proposed. Two measures of statistical uncertainty are introduced and discussed. One is based on conditional risk for multiple decision statistical procedures and another one is based on average fraction of errors. It is shown that for some important cases ...
Added: July 19, 2014
Maslov V., Теоретическая и математическая физика 2019 Т. 201 № 1 С. 65-83
We study the process of a nucleon separating from an atomic nucleus from the mathematical standpoint
using experimental values of the binding energy for the nucleus of the given substance. A nucleon becomes
a boson at the instant of separating from a fermionic nucleus. We study the further transformations of
boson and fermion states of separation in a ...
Added: November 1, 2019
Pahomov F., Известия РАН. Серия математическая 2016 Т. 80 № 6 С. 173-216
Полимодальная логика доказуемости
GLP была введена Г. К. Джапаридзе в 1986 г. Она является логикой доказуемости для ряда цепочек предикатов доказуемости возрастающей силы. Всякой полимодальной логике соответствует многообразие полимодальных алгебр. Л. Д. Беклемишевым и А. Виссером был поставлен вопрос о разрешимости элементарной теории свободной GLP-алгебры, порожденной константами 0, 1 [1]. В этой статье для любого натурального n решается аналогичный вопрос для логик GLPn, являющихся ...
Added: December 4, 2017
Sinelshchikov D., Кудряшов Н. А., Theoretical and Mathematical Physics 2018 Vol. 196 No. 2 P. 1230-1240
We study a family of nonautonomous generalized Liénard-type equations. We consider the equivalence problem via the generalized Sundman transformations between this family of equations and type-I Painlevé–Gambier equations. As a result, we find four criteria of equivalence, which give four integrable families of Liénard-type equations. We demonstrate that these criteria can be used to construct ...
Added: February 9, 2019
Kotelnikova M. V., Aistov A., Вестник Нижегородского университета им. Н.И. Лобачевского. Серия: Социальные науки 2019 Т. 55 № 3 С. 183-189
The article describes a method that allows to improve the content of disciplines of the mathematical cycle by dividing them into invariant (general) and variable parts. The invariants were identified for such disciplines as «Linear algebra», «Mathematical analysis», «Probability theory and mathematical statistics» delivered to Bachelors program students of economics at several universities. Based on ...
Added: January 28, 2020
Kolokolov I., Lebedev V., Sizov G. A., Journal of Experimental and Theoretical Physics 2011 Vol. 140 No. 2 P. 387-400
We analyze magnetic kinematic dynamo in a conducting fluid where the stationary shear flow is accompanied by relatively weak random velocity fluctuations. The diffusionless and diffusion regimes are described. The growth rates of the magnetic field moments are related to the statistical characteristics of the flow describing divergence of the Lagrangian trajectories. The magnetic field ...
Added: February 2, 2017
Min Namkung, Younghun K., Scientific Reports 2018 Vol. 8 No. 1 P. 16915-1-16915-18
Sequential state discrimination is a strategy for quantum state discrimination of a sender’s quantum
states when N receivers are separately located. In this report, we propose optical designs that can
perform sequential state discrimination of two coherent states. For this purpose, we consider not
only binary phase-shifting-key (BPSK) signals but also general coherent states, with arbitrary prior
probabilities. Since ...
Added: November 16, 2020
ООО Фирма "Элист", 2014
В книге представлены тезисы докладов I тура XV Всероссийской научно-технической конференции и школы молодых ученых, аспирантов и студентов. ...
Added: October 17, 2014