一阶混合型方程组的间断边值问题

本文论讨单连通区域上一阶线性混合型(椭圆—双曲型)方程组的间断边值问题.我们首先给出混合型方程组特别是最简单的混合型方程组解的表示式,然后使用逐次逼近法,证明上述边值问题解的存在性与唯一性.由以上结果,可导出A.V.Bitsadze所得的Lavrent’ev-Bitsadze方程u     

SPECTRAL AND SPECTRAL ELEMENT METHODS FOR HIGH ORDER PROBLEMS WITH MIXED BOUNDARY CONDITIONS

In this paper, we investigate numerical methods for high order differential equations. We propose new spectral and spectral element methods for high order problems with mixed inhomogeneous boundary conditions, and prove their spectral accuracy by using the recent results on the Jacobi quasi-orthogonal approximation. Numerical results demonstrate the high accuracy of suggested algorithm, which also works well even for oscillating solutions.     

脉冲周期边值问题拟线性化方法

本文用拟线性化方法研究了一阶脉冲周期边值问题,获得了解的存在唯一性及解的逼近序列的一致收敛性和平方收敛性结果。     

OBLIQUE DERIVATIVE BOUNDARY VALUE PROBLEMS OF MIXED TYPE EQUATION

In this article, the oblique derivative boundary value problems for the mixed type equation uxx sgny uyy = aux buy cu d in another more general domain are discussed and by using the method of complex analysis, a series of solvability results is obtained, which generalizes some recent results.     

INITIAL BOUNDARY VALUE PROBLEMS FOR PARABOLIC EQUATIONS IN LIPSCHITZ CYLINDERS

ＩＮＩＴＩＡＬ ＢＯＵＮＤＡＲＹ ＶＡＬＵＥ ＰＲＯＢＬＥＭＳ ＦＯＲ ＰＡＲＡＢＯＬＩＣ ＥＱＵＡＴＩＯＮＳ ＩＮ ＬＩＰＳＣＨＩＴＺ ＣＹＬＩＮＤＥＲＳ ￥ＧＡＯＷＥＮＪＩＥＡｂｓｔｒａｃｔ：Ｔｈｅｉｎｉｔｉａｌ－Ｄｉｒｉｃｈｌｅｔａｎｄｉｎｉｔ...     

SOME NEW RESULTS FOR NONLINEAR BOUNDARY VALUE PROBLEMS OF MIXED TYPE INTEGRODIFFERENTIAL EQUATION

In this paper we give the existence and uniqueness of solutions for boundary value problems of the form u" = f(t, u,u', T1u,T2u), g(u(0),u(1)) = 0, h(w(0), u(1),u'(0), u'(1)) = 0 by means of the upper and lower solution method.     

半正泛函微分方程边值问题的正解

本文证明了一个关于一类含参数半正奇异泛函微分边值问题正解的存在性结果。推广了已有的某些结果。作为应用,讨论了一个含参数多项式型泛函微分方程正解的存在性问题。     

双周期平面弹性混合问题

本文用复变方法讨论了带双周期分布孔洞和带双周期分布裂缝的无限弹性平面的混合边值问题。给出了这类问题的正确提法。把寻求复应力函数的问题分别归结为求解某种Ｆｒｅｄｈｏｌｍ积分方程和某种正则型奇异积分方程组，证明了解存在且唯一。     

求解非线性高阶多点边值问题的数值方法

关于多点边值问题的正解的存在性,目前存在大量的研究文献.方法包括不动点理论、上下解方法等(见文献[4-6]).由于微分方程多点边值问题在理论和实践上的重要性,其数值算法也长期吸引着众多数学家、物理学家和工程师们的注意.     

VARIABLE MESH FINITE DIFFERENCE METHOD FOR SELF-ADJOINT SINGULARLY PERTURBED TWO-POINT BOUNDARY VALUE PROBLEMS

A numerical method based on finite difference method with variable mesh is given for self-adjoint singularly perturbed two-point boundary value problems. To obtain parameter- uniform convergence, a variable mesh is constructed, which is dense in the boundary layer region and coarse in the outer region. The uniform convergence analysis of the method is discussed. The original problem is reduced to its normal form and the reduced problem is solved by finite difference method taking variable mesh. To support the efficiency of the method, several numerical examples have been considered.     

带有可测系数的二阶非线性抛物型方程组的初—混合边值问题

在多连通区域上研究带有可测系数的二阶非线性抛物型方程组的初－混合边值问题，首先我们将其化为复形式的方程组，并给出在一定条件下的上述初－这值问题解的先验估计，然后利用解的估计和列紧性原理，证明了这种初－边值问题解的存在性。在论证过程中，我们始终用复分析方法讨论文中所提出的问题，没有看到国外有人使用这种方法处理此类问题。     

BOUNDARY VALUE PROBLEMS FOR THIRD ORDER DIFFERENTIAL EQUATIONS

ＢＯＵＮＤＡＲＹＶＡＬＵＥＰＲＯＢＬＥＭＳＦＯＲＴＨＩＲＤＯＲＤＥＲＤＩＦＦＥＲＥＮＴＩＡＬＥＱＵＡＴＩＯＮＳ王金枝内蒙古大学，邮编：０１００２１ＢＯＵＮＤＡＲＹＶＡＬＵＥＰＲＯＢＬＥＭＳＦＯＲＴＨＩＲＤＯＲＤＥＲＤＩＦＦＥＲＥＮＴＩＡＬＥＱＵＡＴＩ...     

关于一类奇异两点边值问题的 Chawla样条方法

1、引言 本文考虑如下的奇异两点边值问题。-1/w（x）（p（x）y＇（x））＇ = f（x,y（x））, x ∈ （0, 1）（1）limx→0＋ p（x）y＇（x） = 0,y（1）=A（2）。     

TWO-SCALE FEM FOR ELLIPTIC MIXED BOUNDARY VALUE PROBLEMS WITH SMALL PERIODIC COEFFICIENTS

1. IntroductionComPosite materials have been widely used in high tedrilogy ewineering as well as or-dinary industrial products since they have mW elegat qllallties, such as high strength, bostffeess, high temperature resistance, corrosion resistance, and fatgh resistance. Most of thecomPosite materiaIs have small periodic condgurations. Thu8 the static analysis of the struc-tures of comPosite materials usually leads to the boundary valu Problezns of eiliPtic patialdtherelitial eqllations wi…     

一类离散m点边值问题正解的存在性与多重性

本文运用锥上的不动点理论,得到了一类离散多点边值问题的一个正解及两个正 解存在性.     

椭圆边值问题的概率算法

本文重新建立了椭圆边值问题的概率模型,在Ｍｏｎｔｅ－Ｃａｒｌｏ算法的基础上,引入了一种新的高精度概率算法,取得很大进展．     

PERIODIC BOUNDARY VALUE PROBLEMS FOR IMPULSIVE INTEGRO-DIFFERENTIAL EQUATIONS OF MIXED TYPE IN BANACH SPACES

1.IntroductionInthispaper,weinvestigatetheperiodicboundaryvalueproblem(PBVP)forfirstordernonlinearimpulsiveintegro-differentialeauationsofmixedtypeinaBanachspaceE:wherefEC[JxExExE,E],J=[0,2r]ticECIE,E](k=1,2,',m:KECID,R ],D={(t,s)EJxJ:t2s},HEC[JxJ,R ],R denotesthesetofallnonnegativenumbers,and0相似文献   

Banach空间二阶非线性混合型脉冲微分-积分方程边值问题的解

在较弱的条件下,利用MSnch不动点定理,研究了Banach空间中二阶非线性混合型脉冲微分-积分方程边值问题解的存在性,推广和改进了某些已有的结果.     

ON MONOTONE ITERATIVE METHOD FOR FIRST ORDER IMPULSIVE INTEGRO-DIFFERENTIAL BOUNDARY VALUE PROBLEMS IN BANACH SPACE

1 IntroductionThe theory of impulsive differential equation has been emerging as animportant area of investigation in recent years (see [11).Let E be a real Banach space, P is a cone of E which defines a partialordering in E: x 5 y1 x, y 6 E if and only if y -- x e P (see [2]). In this paper,we consider the fOllowing periodic boundary value problem (BVP in short) forimpulsive integro-differential equation in Ewhere f 6 C[J x E x E x E,E], J = [0,2r], 0 < t1 < t2 <'' < t. < 2T, Ii 6C[…