نتایج جستجو برای: singular di erential operator

تعداد نتایج: 399959  

2008
Philip O'Kane Alexei Pokrovskii

We consider a di erential equation describing the mass balance in a soil hydrology model with noninvertible Preisach-type hysteresis. We approximate the singular Preisach operator by regular ones and show, as main result, that the solutions of the regularized problem converge to a solution of the original one as the regularization parameter tends to zero. For monotone right hand sides, we prove...

Journal: :نظریه تقریب و کاربرد های آن 0
h. rouhparvar department of mathematics, college of technical and engineering, saveh branch, islamic azad university, saveh, iran

in this paper, the reduced di erential transform method is investigated fora nonlinear partial di erential equation modeling nematic liquid crystals, itis called the hunter-saxton equation. the main advantage of this methodis that it can be applied directly to nonlinear di erential equations withoutrequiring linearization, discretization, or perturbation. it is a semi analytical-numerical metho...

2013
Gunther Rei Holger Boche

| We consider di erential equations A(x) _ x = g(x), where A is an n n-matrix of C 1 functions and g is C 1 . We investigate the above di erential equation about singular points x 0 that are standard in the sense of Rabier. In particular, the null space of A(x 0 ) is of dimension 1. We show that there is a C 1 -di eomorphism that transforms the above equation about x 0 into x 1 _ x 1 = 1, _ x 2...

Journal: :Numerical Lin. Alg. with Applic. 2003
Daniel Loghin Andrew J. Wathen

S hur omplement pre onditioning for ellipti systems of partial di erential equations D. Loghin and A. J. Wathen One su essful approa h in the design of solution methods for saddle-point problems requires the eÆ ient solution of the asso iated S hur omplement problem ([26℄, [19℄). In the ase of problems arising from partial di erential equations the fa torization of the symbol of the operator an...

Journal: :journal of mahani mathematical research center 0
bahman ghazanfari, lorestan university, nahid yari lorestan university

in this paper, modi cation of the optimal homotopy asymptotic method (moham) is appliedupon singular initial value lane-emden type equations and results are compared with the available exactsolutions. the modi ed algorithm give the exact solution for di erential equations by using one iterationonly.

1998
Karl Rohr H. Siegfried Stiehl

In this contribution, we are concerned with the detection and re ned localization of 3D point landmarks. We propose multi-step di erential procedures which are generalizations of an existing two-step procedure for subpixel localization of 2D point landmarks. This two-step procedure combines landmark detection by applying a di erential operator with re ned localization through a di erential edge...

Journal: :journal of linear and topological algebra (jlta) 0
m karimian department of mathematics, islamic azad university, abdanan branch, ilam, iran;

in this study we produced a new method for solving regular di erential equations with step size h and taylor series. this method analyzes a regular di erential equation with initial values and step size h. this types of equations include quadratic and cubic homogenous equations with constant coecients and cubic and second- level equations.

2003
Andrew J. Heunis

We study a singular di$usion on Euclidean space which is characterized by the solution of a classical Itô stochastic di$erential equation in which the di$usion coe2cient is not necessarily of full rank. Our motivation is in earlier results of Basak (J. Multivariate Anal. 39 (1991) 44) and Basak and Bhattacharya (Ann. Probab. 20 (1992) 312), who establish su2cient conditions for singular di$usio...

Journal: :نظریه تقریب و کاربرد های آن 0
khalid aboodh department of mathematics omdurman islamic university (http: //www. fst. oiu. edu. sd) sudan

here, a new method called aboodh transform homotopy perturbation method(athpm) is used to solve nonlinear partial di erential equations, we presenta reliable combination of homotopy perturbation method and aboodh transformto investigate some nonlinear partial di erential equations. the nonlinearterms can be handled by the use of homotopy perturbation method. the resultsshow the eciency of this...

Journal: :journal of mahani mathematical research center 0
esmail hesameddini department of mathematical sciences, shiraz university of technology, p. o. box 71555-313, shiraz, iran mahin azizi department of mathematical sciences, shiraz university of technology, p. o. box 71555-313, shiraz, iran

in this article, a mathematical model describing the growth orterminating myelogenous leukemia blood cancer's cells against naive t-celland e ective t-cell population of body, presented by fractional di erentialequations. we use this model to analyze the stability of the dynamics, whichoccur in the local interaction of e ector-immune cell and tumor cells. wewill also investigate the optima...

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