Results 31 to 40 of about 33,815,075 (304)

The nonlocal boundary value problem with perturbations of mixed boundary conditions for an elliptic equation with constant coefficients. II

Karpatsʹkì Matematičnì Publìkacìï, 2020
In this paper we continue to investigate the properties of the problem with nonlocal conditions, which are multipoint perturbations of mixed boundary conditions, started in the first part.
Ya.O. Baranetskij, P.I. Kalenyuk, M.I. Kopach, A.V. Solomko   +3 more
doaj   +1 more source

Fourier method in the space of φB - distributions

Учёные записки Казанского университета: Серия Физико-математические науки, 2023
In our previous articles, we introduced and explored the notion of φB -distributions with values in the Banach space. This offers a new perspective on the theory of solvability of linear problems, which is important for solving partial differential ...
V. S. Mokeichev, A. M. Sidorov
doaj   +1 more source

The nonlocal multipoint problem with Dirichlet-type conditions for an ordinary differential equation of even order with involution

Математичні Студії, 2020
The spectral properties of the nonself-adjoint problem with multipoint perturbations of the Dirichlet conditions for differential operator of order $2n$ with involution are investigated. The system of eigenfunctions of a multipoint problem is constructed.
Ya.O. Baranetskij, P.I. Kalenyuk, M. I. Kopach, A.V. Solomko   +3 more
doaj   +1 more source

Direct and inverse problems for thermal grooving by surface diffusion with time dependent Mullins coefficient

Mathematical Modelling and Analysis, 2021
We consider the Mullins’ equation of a single surface grooving when the surface diffusion is not considered as very slow. This problem can be formed by a surface grooving of profiles in a finite space region.
Mansur I. Ismailov
doaj   +1 more source

Boundary problem for the singular heat equation

Karpatsʹkì Matematičnì Publìkacìï, 2017
The scheme for solving of a mixed problem with general boundary conditions is proposed for a heat equation \[a(x)\frac{\partial T}{\partial \tau}= \frac{\partial}{\partial x} \left(\lambda(x)\frac{\partial T}{\partial x}\right)\] with coefficient $a(x ...
O.V. Makhnei
doaj   +1 more source

On Solvability of An Inverse Boundary Value Problem For The Elliptic Equation Of Second Order With Periodic And Integral Condition

Cumhuriyet Science Journal, 2019
An inverse boundary value problem for asecond-order elliptic equation with periodic and integral condition isinvestigated. The definition of a classical solution of the problem isintroduced.
N.a. Heydarzade, Y.t. Mehralıyev, Rauf Amırov   +2 more
doaj   +1 more source

New method for renormalon subtraction using Fourier transform

Physics Letters B, 2021
To improve accuracy in calculating QCD effects, we propose a method for renormalon subtraction in the context of the operator-product expansion. The method enables subtracting renormalons of various powers in ΛQCD efficiently and simultaneously from ...
Y. Hayashi, Y. Sumino, H. Takaura
doaj   +1 more source

Boundary value problems for partial differential equations with piecewise contant delay

International Journal of Mathematics and Mathematical Sciences, 1991
The influence of certain discontinuous delays on the behavior of solutions to some typical equations of mathematical physics is studied.
Joseph Wiener
doaj   +1 more source

Vibration of a Flexible Hanging Chain with a Mass on the End in a Nonstationary Regime of the Motion Mechanism in Hoisting Machines [PDF]

Journal of Applied and Computational Mechanics
The article is focused on the vibrations of a heavy chain with a mass on the end when the hoisting machines are in a nonstationary regime of motion, assuming that motor or brake torque is a linear function of the speed of the motion mechanism.
Vassil Zlatanov, Svetoslav Nikolov
doaj   +1 more source

Second boundary-value problem for the generalized Aller–Lykov equation

Vestnik Samarskogo Gosudarstvennogo Tehničeskogo Universiteta. Seriâ: Fiziko-Matematičeskie Nauki, 2019
The equations that describe a new type of wave motion arise in the course of mathematical modeling for continuous media with memory. This refers to differential equations of fractional order, which form the basis for most mathematical models describing a
Marat Aslanbievich Kerefov, Sakinat Khasanovna Gekkieva   +1 more
doaj   +1 more source