完全二阶抽象Cauchy问题的C-适定性及其应用

在本文中,我们给出了算子矩阵生成指数有界的半群的充分必要条件,其中A0,A1为完全二阶抽象柯西问题（ACP2）的系数算子,并讨论了它与（ACP2）在某种意义下的C-适定性之间的关系．最后,我们应用此结果及［3］中的结论讨论了一类具有应用背景的完全二阶抽象柯西问题的C-适定性．     

向量值柯西问题的适定性

设A为复Banach空间X上的稠定闭算子.我们证明了若抽象柯西问题具有C-适定性,则{λ∈C:Reλ≥0）　ρ（A）且存在C>0,使得任给λ∈C,Reλ≥0,都有（λ-A）-1≤C/1+　λ.因而A必为X上某一有界解析半群的无穷小生成元.对于定义在有限区间[0,T]上的抽象柯西问题,我们亦得到了类似的结果.     

四阶非线性 Schrodinger 方程在L^p 初值空间中解的整体存在性研究*

本文考虑当初值u₀ ∈ L^p 时,四阶非线性Schr¨odinger方程的柯西问题的整体适定性. 在p /= 2的情形下,关于该柯西问题的解的存在性结论较少. 受已有二阶Schr¨odinger方程启发,借助一个关于L^p初值的分解引理和Strichartz估计,在 p > 2 且非线性项指数满足一定条件下, 本文得到了该四阶非线性Schr¨odinger方程的柯西问题的解的整体存在性.     

完全二阶抽象柯西问题的温和C-存在族和解空间

本文中,我们定义了完全二阶抽象柯西问题的温和C-存在族.对指数有界的温和C-存在族,我们还给出了温和C-存在族的Hille-Yosida型的充要条件.对不完全二阶抽象柯西问题,我们定义了解空间和Hille-Yosida空间,我们还证明了不完全二阶抽象柯西问题在其Hille-Yosida空间上是自动适定的,把deLaubenfels文中关于一阶抽象柯西问题的相应结果推广到了二阶的情形.     

分数阶拉普拉斯算子指数非线性热方程的局部适定性解

本文研究了分数阶拉普拉斯算子指数非线性热方程的柯西问题.将expL₀^p_o(Rⁿ)中的初始条件分解成光滑部分和exp L^p(Rⁿ)中的很小部分,得到了Orlicz空间exp L^p(Rⁿ)中的局部适定性解.     

柯西与早期复分析的发展

复分析是数学分析的重要组成部分,对分析的发展和物理问题的解决起到不可忽视的作用.柯西是复分析的开创者,给出了一些重要的定理和公式.通过考察相关资料,系统研究柯西的复分析思想的来源和贡献,进而阐述物理问题、其他数学分支与柯西对早期复分析的贡献的相互影响.     

柯西中值定理的逆问题及渐进性

讨论了柯西中值定理的逆问题,并将柯西中值定理"中间点"的渐进性在高阶柯西中值定理中作了推广,得到了一般性的结论.     

Fréchet空间中的二阶线性微分方程Cauchy问题的适定性

在本文中,我们讨论了 Fréchet 空间中二阶线性微分方程 Cauchy 问题的适定性,得到了一个 Hille-Yosida 型结果.     

一类不适定非线性椭圆方程柯西问题的正则化方法(英文)

本文研究了一类不适定的非线性椭圆方程柯西问题.利用一种正则化方法克服其不适定性,获得了正则化解的存在唯一性,稳定性及收敛性结果,并构造一种迭代格式计算了正则化解,推广了已有文献在椭圆方程柯西问题正则化理论与算法方面的相关研究结果.     

Sobolev空间中非电阻MHD方程局部适定性

本文研究了R~d,d=2,3上的非电阻磁流体力学方程的柯西问题.通过建立一个交换子估计,我们在Sobolev空间H~(s-1)×H~s,sd/2中证明了该方程组解的局部适定性.     

Well-posedness of the Ostrovsky–Hunter Equation under the combined effects of dissipation and short-wave dispersion

The Ostrovsky–Hunter equation provides a model for small-amplitude long waves in a rotating fluid of finite depth. It is a nonlinear evolution equation. In this paper we study the well-posedness for the Cauchy problem associated with this equation in presence of some weak dissipation effects.     

The Cauchy Problem for a Differential Inclusion in Banach Spaces and Distribution Spaces

We study well-posedness of degenerate Cauchy problems treated as Cauchy problems for a differential inclusion with a multivalued linear operator. Using a new approach to the definition of degenerate integrated semigroups and their generators in a Banach space, we obtain a well-posedness criterion for the problem. Moreover, we consider the Cauchy problem for a differential inclusion in the space of abstract distributions and give necessary and sufficient conditions for well-posedness in the distribution space.     

耦合Schrdinger-KdV方程组Cauchy问题的适定性

本文研究了耦合Schrodinger－KdV方程组的Cauchy问题，此耦合方程组刻化了一维Langmuir和离子声波相互作用的非线性动力学行为．本文建立了此问题在Hk×Hk中的整体适定性理论（k∈Z+）．     

Determination of Unknown Boundary in the Composite Materials with Stefan-Boltzmann Conditions

Abstract The authors consider one specific kind of heat transfer problems in a threedimensional layered domain, with nonlinear Stefan-Boltzmann conditions on the boundaries as well as on the interfaces. To determine the unknown part of the boundary （or corrosion） by the Cauchy data on the reachable part is an important inverse problem in engineering. The mathematical model of this problem is introduced, the well-posedness of the forward problems and the uniqueness of the inverse problems are obtained.     

Global flow generated by coupled system of Schrödinger-BBM equations

The Cauchy problem for Schrödinger-BBM type coupled equations is studied, which approximately describes the nonlinear dynamics of one-dimensional Langmuir and ion-acoustic waves. Global well-posedness of the problem is proved in space L² × L² and H¹ × H¹ under suitable conditions.     

The Cauchy problem for a one-dimensional nonlinear elastic peridynamic model

This paper studies the Cauchy problem for a one-dimensional nonlinear peridynamic model describing the dynamic response of an infinitely long elastic bar. The issues of local well-posedness and smoothness of the solutions are discussed. The existence of a global solution is proved first in the sublinear case and then for nonlinearities of degree at most three. The conditions for finite-time blow-up of solutions are established.     

高阶非线性Schrǒdinger方程的整体适定性

本文研究了一类非线性高阶Schrǒdinger方程Cauchy问题的整体适定性．利用不动点定理，获得了整体解的存在唯一性及解关于初值的连续依赖性和解具有较强的衰减估计．推广了文献中的结果．     

The Cauchy problem of a focusing energy-critical nonlinear Schrödinger equation

In this paper, we combine variational methods and harmonic analysis to discuss the Cauchy problem of a focusing nonlinear Schrödinger equation. We study the global well-posedness, finite time blowup and asymptotic behavior of this problem. By Hamiltonian property, we establish two types of invariant evolution flows. Then from one flow and the stability of classical energy-critical nonlinear Schrödinger equation, we find that the solution exists globally and scattering occurs. Finally, we get a precise blowup criterion of this problem for positive energy initial data via the other flow.     

Cauchy-type problem for an abstract differential equation with fractional derivatives

The uniform well-posedness of a Cauchy-type problem with two fractional derivatives and bounded operator A is proved. For an unbounded operator A we present a test for the uniform well-posedness of the problem under consideration consistent with the test for the uniform well-posedness of the Cauchy problem for an equation of second order.