一类具一阶奇性核的奇异积分方程

当(?)是复平面C上的光滑封闭曲线,k（z）是在(?)所围成的有界闭区域上连续.在其内部解析的函数时.借助于奇异积分算子的广义逆.讨论了具一阶奇性核的正则型奇异积分方程:　在H类中的求解问题.作为应用,作者给出了当k（z）是一类有理函数时的具体解法,从而统一并推广了 Cauchy核和Hilbert核奇异积分方程的经典结果.     

具高阶奇性解的奇异积分方程的推广Noether定理

本文给出解具高阶奇性时奇异积分方程的推广Ｎｏｅｔｈｅｒ定理．     

带卷积的Riemann边值问题及其应用

本文考虑一类广泛的带卷积的 Riemann 边值问题,它包括了几类最基本的奇异积分方程或边值问题,即 Riemann 边值问题、Cauchy 奇异积分方程、卷积型方程、Winer-Hopf 方程及对偶积分方程等,并将它们统一起来处理,运用的局部性理论研究了此问题 Noether 性的必要充分条件,并确定其指标公式,作为应用特例,讨论了变系数的Cauchy 核与卷积核混合的奇异积分方程。     

实Clifford分析中一类高阶奇异积分的H(o)lder连续性

讨论了实Clifford分析中的一类高阶奇异积分,给出了这类高阶奇异积分的递推公式,计算公式,并且研究了这类高阶奇异积分的Holder连续性,从而使实Clifford分析理论得以拓展.     

复超球面上的奇异积分及奇异积分方程

龚升、孙继广研究了复超球面上积分密度为 H(?)lder 连续的带有 Cauchy 核的奇异积分,在 Cauchy 主值意义下讨论了复超球面的奇异积分方程在 Halder 连续函数类中的求解问题。N.Kerzman 和 E.M.Stein 对强拟面域,A.Koranyi 和 S.Vagi 对齐性空间在 P 次平均收敛意义下,考虑了积分密度为 L~p 可积的带有某种奇性核的奇异积分的另一种主值,本文在他们定义的主值意义下讨论了复超球面上的带有 Cauchy 核的奇异积分     

关于多复变数的积分变换公式及其应用

利用整体分析方法,给出了一个多复变数的整体积分变换公式,获得了C^n中一闭逐块光滑可定向流形上的Bochner-Martinelli型积分高阶偏导具有Hadamard主值的Plemelj公式和相应奇异积分的合成公式,拓广的Poincaré-Bertrand公式.作为应用,我们还讨论了一类高阶Cauchy边值问题和一类多复变数线性高阶奇异微积分方程的正则化问题.     

实Clifford分析中一类高阶奇异积分的Hlder连续性

讨论了实 Clifford分析中的一类高阶奇异积分 ,给出了这类高阶奇异积分的递推公式 ,计算公式 ,并且研究了这类高阶奇异积分的 Hlder连续性 ,从而使实 Clifford分析理论得以拓展 .     

薄体结构温度场的高阶边界元分析

分析了二维问题边界元法3节点二次单元的几何特征,区分和定义了源点相对高阶单元的Ⅰ型和Ⅱ型接近度.针对二维位势问题高阶边界元中奇异积分核,构造出具有相同Ⅱ型几乎奇异性的近似核函数,在几乎奇异积分单元上分离出积分核中主导的奇异函数部分.原积分核扣除其近似核函数后消除几乎奇异性,成为正则积分核函数,并采用常规Gauss数值方法计算该正则积分;对奇异核函数的积分推导出解析公式,从而建立了一种新的边界元法高阶单元几乎奇异积分半解析算法.应用该算法计算了二维薄体结构温度场算例,计算结果表明高阶单元半解析算法能充分发挥边界元法优势,显著提高计算精度.     

实Clifford分析中一类高阶奇异积分的计算公式

讨论了实Clifford分析中的一类高阶奇异积分,给出了这类高阶奇异积分的递推公式,计算公式.从而使实Clifford分析理论得以拓展.     

双参数非线性非局部奇摄动问题的广义解

讨论了一类双参数高阶方程奇摄动边值问题.在适当的条件下,利用不动点定理研究了边值问题广义解的存在性,并用奇摄动方法得到了解的一致有效的渐近表示式.     

SINGULAR INTEGRAL EQUATIONS ALONG AN OPEN ARC WITH SOLUTIONS HAVING SINGULARITIES OF HIGHER ORDER

In this paper, the difficulties on calculation in solving singular integral equations are overcome when the restriction of curve of integration to be a closed contour is cancelled. When the curve is an open arc and the solutions for singular integral equations possess singularities of higher order, the solution and the solvable condition for characteristic equations as well as the generalized Noether theorem for complete equations are given.     

求解一类具有Hibert核的奇异积分方程的小波方法

1　引　　言近年来,用小波方法数值求解积分方程越来越引起人们的注意.文献[1]提出的算法可将一类积分算子所对应的矩阵稀疏化,为小波方法快速求解积分方程开辟了一条新的道路这方面的研究不仅可以深入发展小波理论和应用算法,深入发展小波方法的功效,而且对边界元方法有重要的指导意义.然而研究稳健快速的数值方法,一直是这方面研究的难点问题.本文考虑带Hilbert核的奇异积分方程q(y)=12π∫2π0f(x)ctg12(x-y)dx,y∈[0,2π],(1.1)的小波数值解法;其中f(x)∈H2π,q(y)∈H2π是以2π为周期的Holder类函数;q(y)已知,f(x)待求解;(1.1)式右…     

Approximate solution for a class of two-dimensional nonlinear singular integral equations by the contraction mapping method

We obtain solutions for a class of two-dimensional nonlinear singular integral equations with Hilbert kernel using the contraction mapping method and find the rate of convergence of successive approximations to the exact solution.     

Inversion of singular integrals with multiplicative Cauchy kernel and infinite integration domain

We consider the simplest singular integral equations of the first kind with multiplicative Cauchy kernel and with integration either over the three-dimensional domain (0,+∞) × (0,+∞) × (0,+∞) or over the entire three-dimensional Euclidean space. For these equations, we construct general solutions in the Hölder class and find statements of uniquely solvable problems.     

A direct method of solving singular integral equations with the Hilbert kernel

In this paper we consider a class of second-kind singular integral equations with Hilbert kernel on the unit circumference. We theoretically substantiate a solution method based on an interpolation-type operator.     

Existence results for non-linear singular integral equations with hilbert kernel in banach spaces

A class of non-linear singular integral equations with Hilbert kernel and a related class of quasi-linear singular integro-differential equations are investigated by applying Schauder's fixed point theorem in Banach spaces.      

SINGULAR INTEGRAL EQUATIONS ON THE REAL AXIS WITH SOLUTIONS HAVING SINGULARITIES OF HIGHER ORDER

We transform the singular integral equations with solutions simultaneously having singularities of higher order at infinite point and at several finite points on the real axis into ones along a closed contour with solutions having singularities of higher order, and for the former obtain the extended Neother theorem of complete equation as well as the solutions and the solvable conditions of characteristic equation from the latter. The conclusions drawn by this article contain special cases discussed before.     

The exact solution of a class of Volterra integral equation with weakly singular kernel

In this paper, the weakly singular Volterra integral equations with an infinite set of solutions are investigated. Among the set of solutions only one particular solution is smooth and all others are singular at the origin. The numerical solutions of this class of equations have been a difficult topic to analyze and have received much previous investigation. The aim of this paper is to present a numerical technique for giving the approximate solution to the only smooth solution based on reproducing kernel theory. Applying weighted integral, we provide a new definition for reproducing kernel space and obtain reproducing kernel function. Using the good properties of reproducing kernel function, the only smooth solution is exactly expressed in the form of series. The n-term approximate solution is obtained by truncating the series. Meanwhile, we prove that the derivative of approximation converges to the derivative of exact solution uniformly. The final numerical examples compared with other methods show that the method is efficient.     

Preconditined semilinear stochastic singular and hypersingular integral equations

In this paper, three classes of preconditioners are proposed for solving some stochastic integral equations with the weakly singular kernel and the hypersingular kernel. The first and the second class of preconditioners are based on circulant operators, but the third class of preconditioners is based on iterative substructuring. It is proved that substructuring preconditioners can be better than other preconditioners. Also, the spaces of solutions are discussed such that the solutions of these equations are smooth, therefore, we give special Banach spaces for these integral equations. Finally, numerical results which support our theories are presented