نتایج جستجو برای: dierential equation

تعداد نتایج: 229764  

Journal: :international journal of mathematical modelling and computations 0
siavosh ahmadi tehran north branch-azad university-iran iran, islamic republic of i'm an assistant professor of applied mathematics at the university of azad university. i received my doctorate in fluid mechanics fro pune university. my recent publication include "tornado dynamics" in the journal of karaj azad university.

this paper proves the existence and uniqueness of quadratic mean almost periodic mild so-lutions for a class of stochastic dierential equations in a real separable hilbert space. themain technique is based upon an appropriate composition theorem combined with the banachcontraction mapping principle and an analytic semigroup of linear operators.

Jalil Rashidinia Mohamadreza Mohsenyzade

This paper present a novel numerical algorithm for the linear one-dimensional heat and wave equation. In this method, a nite dierenceapproach had been used to discrete the time derivative while cubic spline isapplied as an interpolation function in the space dimension. We discuss theaccuracy of the method by expanding the equation based on Taylor series andminimize the error. The proposed metho...

Journal: :Journal of Mathematical Physics 2021

Using the formalism of stochastic embedding developed by [J. Cresson, D. Darses, J. Math. Phys. 48, 072703 (2007)], we study how dynamics classical Newton equation for a force deriving from potential is deformed under assumption that this can admit processes as solutions. We focus on two denitions Newton's called dierential and variational. rst prove virial theorem which natural generalization ...

Journal: :J. Symb. Comput. 1997
Mark van Hoeij

The topic of this paper is formal solutions of linear dierential equations with formal power series coeecients. The method proposed for computing these solutions is based on factorization of diierential operators. The notion of exponential parts is introduced to give a description of factorization properties and to characterize the formal solutions. The algorithms will be described and their im...

ب. بابا یار ب. سلطان علیزاده,

In this paper, the dierential transform method (DTM) is applied to the Fisherequation. This method can be used to obtain the exact solutions of Fisherequation. Finally, we give some examples to illustrate the suciency of themethod for solving such nonlinear partial dierential equations. These resultsshow that this technique is easy to apply.

Journal: :international journal of mathematical modelling and computations 0
s. el ouadih department of mathematics, faculty of sciences a¨ın chock,university hassan ii, casablanca, morocco; r. daher department of mathematics, faculty of sciences a¨ın chock,university hassan ii, casablanca, morocco m. el hamma department of mathematics, faculty of sciences a¨ın chock,university hassan ii, casablanca, morocco.

in this paper, using a generalized translation operator, we prove theestimates for the generalized fourier-bessel transform in the space l2 on certainclasses of functions.

Siavosh Ahmadi

This paper proves the existence and uniqueness of quadratic mean almost periodic mild so-lutions for a class of stochastic dierential equations in a real separable Hilbert space. Themain technique is based upon an appropriate composition theorem combined with the Banachcontraction mapping principle and an analytic semigroup of linear operators.  

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه مازندران - دانشکده ریاضی 1390

ابتدا تعاریف و مفاهیمی را که در این رساله مورد استفاده قرار می گیرد را بیان می کنیم. سپس به معرفی فضاهایی می پردازیم که با آن ها سر و کار خواهیم داشت. و‎‎‎‎‎ در پایان به معرفی چند قضیه و اصل می پردازیم. رده ای از دستگاه های بیضوی شبه خطی تباهیده ‎egin{equation*}‎ ‎left{egin{array}{ll}‎ -‎div (h_1 (x)| abla u|^{p-2} abla u )=lambda a(x)|u|^{p-2}u‎ +‎lambda b(x)|u|^{alpha-1}|v|^{eta+1}u+f...

1996
Hiroshi Kokubu Hiroe Oka

We consider a one-parameter family of two-dimensional ordinary di erential equations with a slow parameter drift. Our equation assumes that when there is no parameter drift, there are two invariant curves consisting of equilibria, one of which is normally hyperbolic and whose stable and unstable manifolds intersect transversely. The slow parameter drift is introduced in a way that it creates tw...

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