一维3×3非线性系统脉冲波的干扰

利用非线性几何光学的方法,讨论一维情形下3×3半线性偏微分方程具有两个初始脉冲波的干扰问题.证明方程组近似解的存在性,得到脉冲波的干扰出现在一阶项中.通过对近似解进行误差分析,得到精确解的一个好的近似.     

球形脉冲波穿过聚焦点的分析

利用渐近分析的方法,讨论球型脉冲波在非线性焦散情形下,脉冲波穿过焦点时的性态.得到在时间趋于负无穷的初始条件下,脉冲波穿过焦点时,方程的非线性项可以忽略.     

带有"上确界"的非线性脉冲微分方程无穷边值问题

应用上下解方法和单调迭代技术研究了带有上确界的一阶非线性脉冲微分方程无穷边值问题，并获得了其极值解的存在性结果．     

二阶脉冲泛函微分方程非线性边值问题

通过上下解和单调迭代技术讨论了二阶脉冲泛函微分方程非线性边值问题极值解的存在性,推广了相关文献的结果.     

随机脉冲干扰对B—CKdV方程扭状孤波解的影响

本文利用侯振挺等^[1]提出的马尔可夫骨架过程理论求出了在随机随冲干扰下,B－CKdV方程ut auux bu^2ux ruxx uxxx=0的行波解及其一维分布,并研究了行波解的渐近性质。     

Banach空间含间断项的二阶非线性脉冲微分方程终值问题

本文讨论了Banach空间含间断项的一类二阶非线性脉冲微分方程终值问题,应用不动点定理与上下解方法,获得了其最大解和最小解的存在性．     

脉冲微分方程非线性边值问题的奇摄动

本文研究一类奇摄动二阶脉冲微分方程非线性边值问题．在适当的假设下，利用合成展开法分段构造“脉冲层”和边界层的联立展开法构造所述问题的形式渐近解，借助上、下解方法证明原问题的解的存在性和形式解的一致有效性．     

一阶脉冲泛函微分方程非线性边值问题

考虑一阶脉冲泛函微分方程非线性边值问题,利用上下解方法和单调迭代技术得到了耦合解和唯一解存在的充分条件.所得结果改进和推广了文献的相关结果.     

一类非线性波方程初边值问题解的爆破

该文研究如下具有非线性阻尼项和非线性源项的波方程的初边值问题 u_tt -u_xxt -u_xx -(σ(u²_x)u_x)_x+δ|u_t|^p-1u_t=μ|u|^q-1u, 0 < x <1, 0≤ t ≤T, (0.1) u(0, t)=u(1, t)=0, 0≤t≤ T, (0.2) u(x, 0)=u₀(x), u_t(x, 0)=u₁(x),0≤x≤1.(0.3) 文章将给出问题(0.1)--(0.3)的解在有限时刻爆破的充分条件, 同时将证明问题的局部广义解和局部古典解的存在性和唯一性.     

Banach空间中非线性脉冲微分-积分方程的极值解

该文用单调迭代法结合一些新的技巧,研究了Ｂａｎａｃｈ空间中一阶非线性脉冲微分,积分方程初值问题极值解,在较宽松的条件下,建立了新的存在性定理,对文（３）在Ｌ３＝０的结果作了本质性的改进和推广。     

Rarefaction Wave Interaction and Shock-Rarefaction Composite Wave Interaction for a Two-Dimensional Nonlinear Wave System

In order to construct global solutions to two-dimensional(2 D for short)Riemann problems for nonlinear hyperbolic systems of conservation laws,it is important to study various types of wave interactions.This paper deals with two types of wave interactions for a 2 D nonlinear wave system with a nonconvex equation of state:Rarefaction wave interaction and shock-rarefaction composite wave interaction.In order to construct solutions to these wave interactions,the authors consider two types of Goursat problems,including standard Goursat problem and discontinuous Goursat problem,for a 2 D selfsimilar nonlinear wave system.Global classical solutions to these Goursat problems are obtained by the method of characteristics.The solutions constructed in the paper may be used as building blocks of solutions of 2 D Riemann problems.     

Perturbative Analysis of Wave Interaction in Nonlinear Systems

We propose a new way to handle obstacles to asymptotic integrability in perturbed nonlinear PDEs in the method of normal forms (NFs) in the case of multiwave solutions. Instead of including the whole obstacle in the NF, we include only its resonant part (if it exists) in the NF and assign the remainder to the homological equation. This leaves the NF integrable, and its solutions retain the character of the solutions of the unperturbed equation. We use the freedom in the expansion to construct canonical obstacles that are confined to the interaction region of the waves. For soliton solutions (e. g., of the KdV equation), the interaction region is a finite domain around the origin; the canonical obstacles then do not generate secular terms in the homological equation. When the interaction region is infinite (or semi-infinite, e.g., in wave-front solutions of the Burgers equation), the obstacles may contain resonant terms. The obstacles generate waves of a new type that cannot be written as functionals of the solutions of the NF. When the obstacle contributes a resonant term to the NF, this leads to a nonstandard update of the wave velocity. __________ Translated from Teoreticheskaya i Matematicheskaya Fizika, Vol. 144, No. 2, pp. 410–422, August, 2005.     

带有非线性源的以有限Radon测度为初值的拟线性双曲方程的BV解

这篇文章主要考虑下列以有限Radon测度为初值的非线性双曲方程的Cauchy问题u_t+(u~m)_x=u~p,其中m1,1pm是给定常数.特别的,在文中得到了上述问题BV解的存在唯一性.     

非线性KdV-mKdV方程的新的复合函数解

利用孤立子方程KdV-mKdV的朗斯基解的形式和结构,我们提出了朗斯基形式展开法,运用这一方法获得了KdV-mKdV方程的丰富的新的复合函数解,并且朗斯基行列式中的元素不满足任何线性偏微分方程组.所得到的复合函数解是使用其它的方法得不到的.     

一类具边界耗散的高阶非线性双曲方程整体解的不存在性

本文利用广义凸性方法证明了边界耗散的非线性四阶方程初边值问题整体解的不存在性     

关于非线性双曲波动变分方程的动力学形式

受到[3],[4]和[5]的启发,本文对应于某种波动变分方程的弱解,给出了该方程的动力学 形式,此方程来源于长原子液晶运动双极链中的长波以及其它邻域的研究.     

An Interaction of a Rarefaction Wave and a Transonic Shock for the Self-Similar Two-Dimensional Nonlinear Wave System

We study a two dimensional Riemann problem for the self-similar nonlinear wave system which gives rise to an interaction of a transonic shock and a rarefaction wave. The interesting feature of this problem is that the governing equation changes its type from supersonic in the far field to subsonic near the origin. The subsonic region is then bounded above by the sonic line (degenerate) and below by the transonic shock (free boundary). Furthermore due to the rarefaction wave in the downstream, which interacts with the transonic shock, the problem becomes inhomogeneous and degenerate. We establish the existence result of the global solution to this configuration, and present analysis to understand the solution structure of this problem.     

一类带有源项的拟线性波动方程的初边值问题

考虑一类带有源项的拟线性波动方程的初边值问题,利用G a lerk in方法和单调算子方法讨论在混合边界条件下,该问题整体广义解的存在性及衰减性.