Existence, Uniqueness and Blow-up of Generalized Solutions to General Nonlinear Filtration Equations

In this paper, we consider nonnegative solutions to Cauchy problem for the general nonlinear filtration equations ut -Dj （α^ij （x, t, u）Diψ（u）） ＋b^i （t, u）Diu＋C（x, t, u） = 0, and obtain the existence, uniqueness and blow-up in finite time of these solutions under some structure conditions.

Local Existence and Uniqueness Theorem for a Nonlinear Schrödinger Equation with Robin Inhomogeneous Boundary Condition

In recent years, a vast amount of work has been done on initial value problems for important nonlinear evolution equations like the nonlinear Schrödinger equation (NLS) and the Korteweg-de Vries equation (KdV). No comparable attention has been given to mixed initial-boundary value problems for these equations, i.e. forced nonlinear systems. But in many cases of physical interest, the mathematical model leads precisely to the forced problems. For example, the launching of solitary waves in a shallow water channel, the excitation of ion-acoustic solitons in a double plasma machine, etc. In this article, we present the PDE (Partial Differential Equation) method to study the following iut = uxx - g|u|pu, g ∈ R, p > 3, x?∈ Ω = [0,L], 0 ≤?t?u (x,0) = u0 (x) ∈?H2 (Ω) and Robin inhomogeneous boundary condition ux (0,t) + αu (0,t) = R1(t), t ≥ 0 and ux (L,t) + αu (L,t) = R2 (t), t ≥ 0 (here?α?is a real number). The equation is posed in a semi-infinite strip on a finite domain Ω. Such problems are called forced problems and have many applications in other fields like physics and chemistry. The main tool of PDE method is semi-group theory. We are able to prove local existence and uniqueness theorem for the nonlinear Schrödinger equation under initial condition and Robin inhomogeneous boundary condition.

PERIODIC BOUNDARY VALUE PROBLEM AND CAUCHY PROBLEM OF THE GENERALIZED CUBIC DOUBLE DISPERSION EQUATION

In this article, the existence, uniqueness and regularities of the global generalized solution and global classical solution for the periodic boundary value problem and the Cauchy problem of the general cubic double dispersion equationutt - uxx - auxxtt ＋ bux4 - duxxt = f（u）xxare proved, and the sufficient conditions of blow-up of the solutions for the Cauchy problems in finite time are given.

Global Attractors and Their Dimension Estimates for a Class of Generalized Kirchhoff Equations

In this paper, we studied the long-time properties of solutions of generalized Kirchhoff-type equation with strongly damped terms. Firstly, appropriate assumptions are made for the nonlinear source term g (u) and Kirchhoff stress term M (s) in the equation, and the existence and uniqueness of the solution are proved by using uniform prior estimates of time and Galerkin’s finite element method. Then, abounded absorption set B0k is obtained by prior estimation, and the Rellich-kondrachov’s compact embedding theorem is used to prove that the solution semigroup S (t) generated by the equation has a family of the global attractor Ak in the phase space . Finally, linearize the equation and verify that the semigroups are Frechet diifferentiable on Ek. Then, the upper boundary estimation of the Hausdorff dimension and Fractal dimension of a family of the global attractor Ak was obtained.

LOCAL WELL-POSEDNESS TO THE CAUCHY PROBLEM OF THE 3-D COMPRESSIBLE NAVIER-STOKES EQUATIONS WITH DENSITY-DEPENDENT VISCOSITY

In this article, we prove the local existence and uniqueness of the classical solution to the Cauchy problem of the 3-D compressible Navier-Stokes equations with large initial data and vacuum, if the shear viscosity μ is a positive constant and the bulk viscosity λ（ρ） = ρ^β with β≥0. Note that the initial data can be arbitrarily large to contain vacuum states.

THE CAUCHY PROBLEM FOR A CLASS OF DOUBLY DEGENERATE NONLINEAR PARABOLIC EQUATION

This article studies the Cauchy problem for a class of doubly nonlinear degenerate parabolic equations au/at = div（A（｜△↓B（u）｜）△↓B（u））. Under certain conditions, the author considers its regularized problem and establishes some estimates. On the basis of the estimates, the existence and uniqueness of the generalized solutions in BV space are proved.

非线性退化抛物方程古典解存在性的一个注记

对非线性退化抛物方程第一边值问题的结果作了推广，证明了在一定条件下，广义解的存在性和唯一性。

非古典热方程解的存在唯一性

考虑半无界域上一维非古典热方程ｕｔ＝ａ（ｑ→（ｔ））ｕｘｘ古典解的存在性和唯一性，其中ｑ→（ｔ）＝（ｕ（ｘ０，ｔ），ｕｘ（ｘ１，ｔ），…，ｎｕｘｎ（ｘｎ，ｔ））．

受迫广义KdV－Burgers方程的周期行波解

讨论了一维广义ＫｄＶ－Ｂｕｒｇｅｒｓ方程的周期行波解，给出了解的有界性及估计式，进而讨论了解的存在性和唯一性。

广义线性微分方程边值问题解的存在唯一性

应用有界线性算子的性质,讨论了一类广义线性微分方程边值问题解的存在唯一性.在假设条件下,将这类边值问题的解用格林矩阵的形式表示出来.

一类非线性伪抛物方程的古典解

研究在一定条件下一类非线性伪抛物方程的第一初边值问题古典解的存在性和惟一性

二维Wigner-Poisson方程Cauchy问题解的存在性

考虑二维 Wigner-Poisson方程 Cauchy问题 ,在电荷中性情形下 。

一类拟抛物方程Cauchy问题整体解的存在唯一性

对于一类三阶拟抛物方程ut-uxxt=f(ux)x的Cauchy问题,利用压缩映射原理证明了局部广义解的存在唯一性,给出和验证了局部解满足的延拓条件,证明了当非线性函数f(s)满足条件|f′(s)|≤α时该问题整体广义解的存在唯一性.

共振条件下的半线性波动方程的周期Dirichlet问题(英文)

利用minmax原理的一个非变分形式和Galerkin方法 ,在共振条件下证明了半线性波动方程的周期Dirichlet问题的一个存在唯一性结果 ,推广了现存的结果。

二阶退化双曲型方程的第二Darboux问题及其推广和应用

本文主要给出一般区域上的Darboux第二问题与一般斜微商问题解的表示式,进而使用复分析的方法证明了这些问题解的存在性与唯一性。本文中得到的结果,可用来解决一般区域上的广义chaplygin方程的Tricomi问题。

受迫广义二维Kdv-Burgers方程周期行波解的存在唯一性

讨论了二维广义受迫Kdv -burgers方程的周期行波解 ,得到了解的存在唯一性定理。

受迫广义KdV-Burgers方程行波解的存在唯一性(英文)

本文研究具有受迫性的广义二维KdV-Burgers方程的周期行波解,为了获得周期行波解的存在唯一性定理,使唤用特定系数法和Schauder不动点定理获得了受迫广义KdV-Burgers方程周期行波解存在唯一性的条件.并获得了周期行波解的一些先验估计式.

二维Wigner-Poisson方程解的存在性

考虑二维Wigner Poisson方程的Cauchy问题 ,在电荷中性情形下 。

二阶退化双曲型方程的第二类广义Darboux问题

A.V.Bitsadze在文[1]中提出和研究了二阶一致线性双曲型方程uxx-uyy+aux+by+cu+d=0(A)的第一类和第二类Darboux问题.本文的目的是讨论二阶退化双曲型方程第二类广义Darboux问题和斜微商问题解的表示式,并证明这些问题解的存在唯一性。本文使用不同于[1]中的方法,但类似于[1]中的方程(A),根据本文中的结果,我们可以解决广义Chaplygin方程在一般区域上的Frankl问题.

一个半线性抛物型方程初值问题古典解的局部存在性

用算子etΔ定义一积分方程,应用Banach空间上的不动点定理证明了一个半线性抛物型方程初值问题古典解的局部存在唯一性。