微分形式的双权积分不等式

该文证明了满足A -调和方程的微分形式的局部双权积分不等式. 作为局部结果的应用,还证明了满足A -调和方程的微分形式的整体双权积分不等式.     

A-调和方程弱解的新的加权积分不等式

研究形如div A(x,u(x))=0的A-调和方程,证明其弱解满足局部Arλ3(λ1,λ2,Ω)-权Caccioppoli型不等式,这可看作A-调和方程相应结果的推广.最后给出上述结果在拟正则映射中的应用.     

A-调和方程弱解的逆Hlder不等式及其应用

本文给出A 调和方程弱解的逆H lder不等式及其若干应用 .     

弱A-调和张量的奇点可去性

该文研究微分形式的A-调和方程d~*A(x,du)=0,通过Hodge分解建立弱A-调和张量的Caccioppoli不等式,获得了弱A-调和张量的奇点可去性.     

A -调和方程障碍问题很弱解的局部正则性

该文使用Hodge分解的方法, 给出了A -调和方程divA(x, u, u)=0具有非负障碍函数的障碍问题很弱解的局部正则性结果.     

调和方程自然边界元Shannon 小波方法

1 引言 调和方程无论是在数学上还是在物理学中都占有重要地位,它有很多不同的物理背景,在力学和物理学中研究的许多问题都可归结为调和方程的边值问题,所以对调和方程进行深入研究有重要意义.余德浩教授在[3]中主要对调和方程在典型域(即单位圆,上半平面)上的情形进行了考虑.特别地,对单位圆的情形给出了刚度矩阵系数的计算公式和调和方程解的存在唯一性.本文采用由冯康教授[1]开创的自然边界元方法和Galerkin小波方法相耦合,对上半平面的调和方程Neumann问题进行了研究,得到十分有效的计算结果.     

变指数A-调和方程弱解的梯度的局部Hlder连续性

考虑变指数A-调和方程div.A(x,▽u)=B(x,▽u),给出其弱解的梯度的局部Hlder连续性.     

障碍问题解的局部正则性和局部有界性

该文在算子A(x,ξ):Ω×R~n→R~n的强制性条件和控制增长条件下,考虑A-调和方程divA(x,▽u(x))=0的κ_(Ψ,θ)-障碍问题的解.A的原型是A(x,ξ)=(μ~2+|ξ|~2)~((p-2)/2)ξ,μ≥0.得到了局部正则性和局部有界性结果.     

RN上的临界非齐次多重调和方程的多解存在性

讨论了 RN上带非负扰动的临界非齐次多重调和方程的多解存在性 .首先由泛函弱连续性方法获得方程的第一个解 ,再由山路引理获得方程的第二个解 .本文的这种求解方法和这些结果不仅适用于 RN 上的二阶椭圆方程 ,而且也适用于尚未解决的 RN 上的双调和方程     

A-调和方程弱解的逆H(o)lder不等式及其应用

本文给出了A－调和方程弱解的逆Holder不等式及其若干应用。     

Partial regularity for weak heat flows into riemannian homogeneous spaces

It is proved that any weak flow of harmonic maps into a compact homogeneous manifold satisfying the monotonicity inequality and the energy inequality is regular off a closed set of m-dimensional Hausdorff measure zero (w.r.t parabolic metric), and coincides with a regular flow if the latter one exists. Moreover, it is also shown that the weak limit of a sequence of such weak flows is a weak flow.     

Chaos control by harmonic excitation with proper random phase

Chaos control may have a dual function: to suppress chaos or to generate it. We are interested in a kind of chaos control by exerting a weak harmonic excitation with random phase. The dual function of chaos control in a nonlinear dynamic system, whether a suppressing one or a generating one, can be realized by properly adjusting the level of random phase and determined by the sign of the top Lyapunov exponent of the system response. Two illustrative examples, a Duffing oscillator subject to a harmonic parametric control and a driven Murali-Lakshmanan-Chua (MLC) circuit imposed with a weak harmonic control, are presented here to show that the random phase plays a decisive role for control function. The method for computing the top Lyapunov exponent is based on Khasminskii's formulation for linearized systems. Then, the obtained results are further verified by the Poincare map analysis on dynamical behavior of the system, such as stability, bifurcation and chaos. Both two methods lead to fully consistent results.     

Weak Orlicz spaces: Some basic properties and their applications to harmonic analysis

We study some basic properties of weak Orlicz spaces and their applications to harmonic analysis. We first discuss the absolute continuity of the quasi-norm and its normality, then prove the boundedness of several maximal operators. We also establish a kind of Marcinkiewicz-type interpolation theorem between weak Orlicz spaces. As applications, the weak type analogues of several classical inequalities in harmonic analysis is obtained.     

P-调和映射流的存在性与不唯一性

构造了ｐ 调和发展方程的初边值问题的一个整体弱解；证明了当初值ｕ０（ｘ）是弱ｐ 调和映射但不是弱ｐ 驻调和映射时问题弱解的不唯一性．     

Extreme points of subordination and weak subordination families of harmonic mappings

The aim of the paper is to discuss the extreme points of subordination and weak subordination families of harmonic mappings. Several necessary conditions and sufficient conditions for harmonic mappings to be extreme points of the corresponding families are established.     

Eichler integrals and harmonic weak Maass forms

Recently, K. Bringmann, P. Guerzhoy, Z. Kent and K. Ono studied the connection between Eichler integrals and the holomorphic parts of harmonic weak Maass forms on the full modular group. In this article, we extend their result to more general groups, namely, H-groups by employing the theory of supplementary functions introduced and developed by M.I. Knopp and S.Y. Husseini. In particular, we show that the set of Eichler integrals, which have polynomial period functions, is the same as the set of holomorphic parts of harmonic weak Maass forms of which the non-holomorphic parts are certain period integrals of cusp forms. From this we deduce relations among period functions for harmonic weak Maass forms.     

解决谐波间耦合动力问题的摄动法

本文针对具有谐波间弱耦合作用的振动问题,利用摄动展开,将耦合的问题化成了若干个无耦合的问题,给出了解决谐波间弱耦合动力问题的摄动方法.     

Hodge equations with change of type

A geometric interpretation is given for certain elliptic-hyperbolic systems in the plane. Among several examples, one which reduces to the equations for harmonic 1-forms on the projective disc is studied in detail. A boundary-value problem for this example is formulated and shown to possess weak solutions. Received: May 16, 2001; in final form: September 24, 2001?Published online: October 30, 2002     

Generalized Harmonic Functions and the Dewetting of Thin Films

This paper describes the solvability of Dirichlet problems for Laplace's equation when the boundary data is not smooth enough for the existence of a weak solution in H¹Ω. Scales of spaces of harmonic functions and of boundary traces are defined and the solutions are characterized as limits of classical harmonic functions in special norms. The generalized harmonic functions, and their norms, are defined using series expansions involving harmonic Steklov eigenfunctions on the domain. It is shown that the usual trace operator has a continuous extension to an isometric isomorphism of specific spaces. This provides a characterization of the generalized solutions of harmonic Dirichlet problems. Numerical simulations of a model problem are described. This problem is related to the dewetting of thin films and the associated phenomenology is described.