A Problem with Nonlocal Boundary Conditions for a Quasilinear Parabolic Equation

The solvability of the nonlocal boundary value problem

一类拟线性椭圆障碍问题极小正解的存在性

该文使用Ｌｉｏｎｓ的集中紧性原理和变分方法,证明了一类非齐次拟线性椭圆型方程对应的障碍问题中极小正解的存在性．     

Existence of a Global Solution to One Model Problem of Atmosphere Dynamics

We consider a model problem of compressible viscous fluid dynamics in the two-dimensional case. We prove a global existence theorem.     

拟线性混合方程的不连续边值问题

该文利用复分析的方法对双曲区域实施共形映照,通过将双曲区域的边界曲线变换为直线段,研究了另一类更一般区域上的拟线性二阶混合型方程的不连续边值问题,得到了一些较新的可解性结果的推广.     

Almost Global Strong Solutions to Quasilinear Dissipative Evolution Equations

The author proves a global existence result for strong solutions to the quasilinear dissipative hyperbolic equation （1.1） below, corresponding to initial values and source terms of arbitrary size, provided that the hyperbolicity parameter ε is sufficiently small. This implies a corresponding global existence result for the reduced quasilinear parabolic equation （1.4） below.     

一类二阶拟线性方程边值问题解的存在性

文献[1]讨论了二阶拟线性常微分方程两点边值问题的 正解的存在性,但它限制了0<α<1<β.本文则对方程 证明了正解的存在性.     

线性退化的严格双曲组具慢衰减初值的Cauchy问题的经典解

该文给出了线性退化的严格双曲组具慢衰减及小全变差初值的Cauchy问题的经典解的整体存在唯一性. 这个结果进一步推广了A Bressan的相关结果     

一类拟线性边值问题的激波解

本文研究了一类拟线性边值问题的激波解，在适当的条件下，利用微分不等式理论，讨论了原边值问题激波解的存在性和渐近性态。     

一类拟线性抛物系统解的整体存在性

本文采用非线性分析方法,研究生物种群动力学中一类拟线性抛物系统,得到解的整体存在性．     

一类拟线性椭圆方程非平凡广义解的存在性

该文讨论了下列拟线性椭圆方程的Dirichlet问题在一类Orlicz-Sobolev 空间中非平凡解的存在性 { -div(a(| u(x)|) u(x))=g(x, u), x∈Ω, u(x)=0,x∈∂Ω. 其中Ω 是 Rⁿ 中光滑的有界区域.Φ 和 g 满足一定条件时, 利用推广的山路引理证明了上述Dirichlet 问题存在广义的非平凡解的存在性.     

一类拟线性椭圆型方程正对称解的先验界估计

本文讨论了问题－ ｄｉｖ（｜Ｄｕ｜ｐ－ ２Ｄｕ） ＝ λｆ（ｕ）,　　在Ω中,ｕΩ＝ ０正对称解的先验界估计     

一维非单调流体模型在H2中解的整体存在性

In this paper, we prove the existence in H_ ~2, an incomplete metric subspace of H~2×H~2×H~2, of global solutions to the system for a one-dimensional non-monotone fluid in bounded domainΩ=(0,1). The results in this paper have improved those previously related results.     

Formation of Singularities of Solutions for Cauchy Problem of Quasilinear Hyperbolic Systems with Dissipative Terms

ln this paper, for a class of 2 × 2 quasilinear hyperbolic systems, we get existence theorems of the global smooth solutions of its Cauchy problem, under a certain hypotheses. In addition, Tor two concrete quasilinear hyperbolic systems, we study the formation of the singularities of the C¹-solution to its Cauchy problem.     

Global Existence in H^2 for a 1-d Non-monotone Fluid

In this paper, we prove the existence in H＋^2, an incomplete metric subspace of H^2×H^2×H^2, of global solutions to the system for a one-dimensional non-monotone fluid in bounded domainΩ=（0,1）. The results in this paper have improved those previously related results.     

Existence of a Classical Solution for a Multidimensional Filtration Problem

We prove existence, in a small time interval, of a classical solution having a regular free boundary, (i.e. the level set {u=0}) of a multidimensional filtration problem. The key point to get the regularity of the level set {u=0} is the proof of an a priori estimate for the L_∞-norm of u_t. © 1997 by B.G. Teubner Stuttgart-John Wiley & Sons, Ltd.     

具耗散项拟线性双曲型方程组的边值问题

本文考虑具耗散项一阶拟线性双曲型方程组的具有自由边界的典型自由边值问题．在一些合理假设下,证明了其经典解的整体存在性定理．     

Existence and Uniqueness of Radial Solutions of Quasilinear Equations in a Ball

We consider the boundary value problem for the quasilinear equation div(A(|Du|)Du) + f(u) = 0, u > 0, x ∈ B_R(0), u|_{∂B_R(0)} = 0, where A and f are continuous functions in (0, ∞) and f is positive in (0, 1), f(1) = 0. We prove that (1) if f is strictly decreasing, the problem has a unique classical radial solution for any real number R > 0; (2) if f is not monotonous, the problem has at least one classical radial solution for some R > 0 large enough.     

Global Existence for a Class of Non-Fickian Polymer-penetrant Systems

This paper deals with a class of strongly coupled and highly degenerate nonlinear parabolic systems, which arises from a model describing non-Fickian diffusion of penetrant into glassy polymers. By means of a fixed point argument and a priori estimates, we establish the global existence and uniqueness for the systems.     

On the Cauchy Problem for a Class of Linear Weakly Hyperbolic Operators

Abstract

We study a class of linear weakly hyperbolic operators with anisotropic degeneracy on their characteristic manifold and we give sufficient conditions for the well-posedness of the related Cauchy problem.     

Classical Solution to the Electropainting Problem

The mathematical modelling of the electrodeposition phenomenon leads to a linear elliptic partial differential equation subject to nonlinear evolutionary mixed boundary conditions. ln this paper, the existence, uniqueness and regularity of classical solution are proved for the electropainting problem when “dissolution current” is zero.