Some Properties of Cauchy-Type Singular Integrals in Clifford Analysis

First,we give a module estimation of the singular integral with a differential element.Then by proving the existences of Cauchy principal value we obtain the transformation formula of the Cauchy-type singular integrals with a parameter.     

Clifford分析中Cauchy型奇异积分算子的一些性质

First,we give a module estimation of the singular integral with a differential element.Then by proving the existences of Cauchy principal value we obtain the transformation formula of the Cauchy-type singular integrals with a parameter.     

Clifford分析中两个Cauchy型奇异积分算子的换序公式

先证明了Clifford分析中普通积分算子在Liapunov闭曲面上的换序公式,然后证明了两个Cauchy型奇异积分算子的存在性及性质,最后给出了这两个奇异积分算子的换序公式.     

变量核奇异积分和分数次微分加权范不等式

用T和D^γ（0 ≤ γ ≤ 1）分别表示变量核奇异积分和分数次微分算子.T^*和T^#分别为T的共轭算子及拟共轭算子.利用球调和多项式展式,本文得到了TD^γ-D^γT和（T^*-T^#）D^γ在?^q,λ_ω（Rⁿ）上的有界性.同时也得到了变量核奇异积分的积T₁T₂和拟积T₁°T₂的加权范不等式.     

某些带变换的边值问题和奇异积分方程

本文主要考虑某些带变换的奇异积分方程。尽管用经典的正则化方法可以求解，我们还是给出一种新的分区跳跃方法，使它们化为较简单的可以系统地求解并可迅即讨论的Ｆｒｅｄｈｏｌｍ积分方程。     

带有积分边界条件的一阶脉冲微分方程奇异边值问题

利用Schauder′s不动点定理研究带有积分边界条件的一阶脉冲微分方程奇异边值问题,得到正解的存在性结论.其中对应非脉冲情形的相关结论也是新的.     

On Solvability of a Boundary Value Problem for Singular Integral Equations

This paper deals with the solvability of boundary value problems for singular integral equations of the form (i)-(ii).By an algebraic method we reduce the problem (i)-(ii) to a system of linear algebraic equations which gives all solutions in a closed form.AMS Subject Classification: 47G05, 45GO5, 45E05     

On Boundary Behavior of the Cauchy Type Integrals with Values in a Universal Clifford Algebra

In this paper, we discuss boundary behavior for the Cauchy type integrals with values in a universal Clifford algebra for certain distinguished boundary and obtain some Sochocki–Plemelj formulae and Privalov–Muskhelishvili theorems.     

二阶奇异积分边值问题的正解

By using the fixed point index in cone and the fixed theorem of cone expansion and compression, the existence of positive solutions to the singular second-order boundary value problem is considered.     

具有积分边界条件的四阶奇异特征值问题的正解

本文研究一类具有积分边界条件的四阶奇异特征值问题正解的存在性,非线性项f(t,u)允许在t=0和/或t=1和u=0处奇异.首先给出一个新的比较定理,然后构造奇异特征值问题的上下解,最后运用Schauder不动点定理获得了当f(t,u)关于u是减的情况下正解的存在性,给出了处理f(t,u)允许在u=0处奇异的方法,可以处理f(t,u)在u=0处奇异的方法并不多见.     

A Radial Derivative with Boundary Values of the Spherical Poisson Integral

A formula of a radial derivative is obtained with the aid of derivatives with respect to and to of the functions closely connected with the spherical Poisson integral and the boundary values are determined for . The boundary values are also found for partial derivatives with respect to the Cartesian coordinates .     

含积分算子拟线性系统边值问题的奇摄动

研究奇摄动积分微分方程组边值问题εy"＝f(x,y,Ty,ε)y′++g(x,y,Ty,ε);y(0,ε)＝A(ε),y(1,ε)=B(ε)其中y、g、A和B均为n维向量函数,f是n×n矩阵函数,(Ty)(x)=∫xK(x,s,y(sε),ε)ds在一定假设条件下,利用对角化技巧和逐步逼近法证明解的存在,并给出解的直到0(εN+1)的渐近展开式.     

具有时滞和积分边界条件的三阶奇异边值问题的正解(英文)

本文基于锥拉伸和锥压缩不动点定理,得到一类三阶时滞奇异边值问题至少具有两个正解的充分条件,并给出例子说明定理的应用.     

位势问题边界元法中几乎奇异积分的正则化

将一种通用算法应用于平面位势问题边界元法中近边界点几乎奇异积分的正则化。对线性单元,位势问题近边界点的几乎强和超奇异积分可归纳为两种形式。通过分部积分,将引起奇异的积分元素变换到积分号之外,从而对这两种积分分别给出了无奇异的正则化计算公式。除了线性元,二次元也应用于该算法。与近边界点临近的二次单元划分为两段线性单元,该算法仍然适用。算例证明了方法的有效性和精确性。对曲线边界问题,联合二次元和线性元可提高计算结果精确度。     

Multilinear Singular and Fractional Integrals

In this paper, we treat a class of non-standard commutators with higher order remainders in the Lipschitz spaces and give （L^v, L^q）, （H^p, L^q） boundedness and the boundedness in the Triebel- Lizorkin spaces. Our results give simplified proofs of the recent works by Chen, and extend his result.     

边界元法中奇异积分计算的极坐标变换法

在边界元法中,奇异积分的处理是一个极为引人注目的问题.本文提出了一种在单元状态作极坐标变换的新的处理方法,它能显式地消除奇异积分的奇异性,使之成为常规积分,因而易于在边界元法中使用高次单元.计算实例表明,本文所提出的方法是有效的、方便的.     

The Dirichlet Energy Integral and Variable Exponent Sobolev Spaces with Zero Boundary Values

We define and study variable exponent Sobolev spaces with zero boundary values. This allows us to prove that the Dirichlet energy integral has a minimizer in the variable exponent case. Our results are based on a Poincaré-type inequality, which we prove under a certain local jump condition for the variable exponent.     

An Asymptotic Expansion for a Regularization Technique for Numerical Singular Integrals and its Application to Volterra Integral Equations

A generalized Euler-Maclaurin sum formula is established forthe numerical quadrature scheme derived in Abd-Elal & Delves(1976). The result is used to characterize the convergence ofa block-by-block method for Volterra integral equations; necessaryand sufficient conditions for the convergence of this schemeare also derived. The method is applicable also to integro-differentialequations.