四阶奇异摄动边值问题在自适应网格上的一致收敛分析

we study a difference scheme for the fourth-order singular pertur-bation differential equation on the Bakhvalov-Shishkin grid by Green‘‘s function.The method is shown to be uniformly convergent with respect to the perturbation parameter,of order N^-2 in the maxmum norm on Bakhvalov-Shishkin meshes.Numerical results support our theoretical results.     

一类非线性椭圆型方程奇摄动问题

A class of singularly perturbed problems for the nonlinear elliptic equations is considered. Under suitable conditions, using the theory of differential inequalities the asymptotic behavior of solution for the boundary value problems are studied, which reduced equations possess two intersecting solutions.     

ASYMPTOTIC BEHAVIOR OF SINGULARLY PERTURBED SOLUTION FOR A CLASS OF ROBIN PROBLEM OF NONLINEAR NON-AUTONOMOUS EQUATION

In this paper, using the layer theory, a class of singularly perturbed Robin problem of nonlinear non-autonomous equation is considered. According to the different regions of the boundary value, the asymptotic behaviors of solution for the original problem are obtained simply and conveniently.     

THE SOLVABILITY FOR HEAT CONDUCTIVE PROBLEM WITH BOUNDARY PERTURBATION

In this paper, the heat conductive problem with boundary perturbations is considered. Using the solvability of the problem, two eigenfunctions corresponding to two eigenvalues for the nm-th modular form are obtained.     

一类三阶奇摄动特征值问题

将带有边界条件的三阶非齐次线性方程的可解性条件应用到退化特征值问题上,得出了奇摄动问题的解的渐近表示式.     

一类具有边界摄动的三阶非线性边值问题的奇摄动

关于三阶非线性奇摄动边值问题的研究,近年来,国内外学者做过一些研究。然而,关于这类问题解的唯一性问题,则仅仅在文献[4]、[5]中作过某些讨论。本文所要讨论的微分方程具有一种奇异特性,亦即fx″(t,x,x′,ε)≡0。而且当ε=0时三阶边值问题退化为一阶初值问题。所有这些特点,无疑将给对边值问     

厚环壳的渐近求解方程和作用弯矩M0的解

本文从三维弹性力学基本方程出发，利用几何小参数ａ＝ｒ＿０／Ｒ＿摄动展开，得到了任意载荷下，厚环壳的各级渐近求解方程。它可以分成两组类似平面应变问题和扭转问题的独立方程组。用此方程求得了厚环壳受弯矩Ｍ＿０作用的两级渐近解。