复双球垒域上奇异积分的估计

文[1]中研究了复超球上的奇异积分．本文利用复双球面上的立体角系数的方法，把[1]中复超球上的奇异积分推广到复双球垒域上，得到复双球垒域上奇异积分的一些估计．     

复超球面上奇异积分方程的正则化

<正> 在一维奇异积分方程论中,复变函数的 Cauchy 型积分起着十分重要的作用;但在研究高维奇异积分方程时,利用多复变数 Cauchy 型积分作为工具者,至今尚少(参看[2]—[6]).本文是用复超球的 Cauchy 型积分边界性质,处理复超球面上含 Cauchy 核、B 核与 h 核的奇异积分方程的正则化问题.     

Dirichlet空间上的超循环复合算子

设Bn是复平面C中的单位圆盘(n=1)或复空间Cn中的单位球.众所周知,在Hardy空间上存在丰富的符号在Aut(Bn)中的超循环复合算子.然而,在复平面中单位圆盘上的Dirichlet空间中, 任何复合算子都不能是超循环的.本文则证明,当n>1时,Bn上的Dirichlet空间中确有超循环复合算子.     

Dirichlet空间上的超循环复合算子

设Bn是复平面C中的单位圆盘(n=1)或复空间Cn中的单位球.众所周知,在Hardy空间上存在丰富的符号在Aut(Bn)中的超循环复合算子.然而,在复平面中单位圆盘上的Dirichlet空间中,任何复合算子都不能是超循环的.本文则证明,当n＞1时,Bn上的Dirichlet空间中确有超循环复合算子.     

复双球垒域上奇异积分的Cauchy主值

利用一种新的挖法定义复双球垒域上的立体角系数,得到奇异积分的Cauchy主值的存在性.推广了复超球上的奇异积分理论.     

复Banach空间中单位球上双全纯凸映射的偏差定理

本文讨论一般复Banach空间上单位球B的Caratheodory度量和Kobayashi 度量的性质,并据此将Cn(n≥1)中单位球Bn上双全纯凸映射的矩阵形式偏差定理 推广到一般复Banach空间的单位球B上.     

超球上调和分析的若干结果

本文运用函数论方法得到复超球＝｛Ｚ｜Ｚ＝（ｚ１，ｚ２，…ｚｎ）∈　，ＺＺ＜１｝的Ｈａｒｉｓｈ积分变换及其反演公式，并讨论　上卷积的若干性质。     

Cauchy奇异积分的边界性质

本文定义了Ｒ＾ｎ中的某类区域的边界上的Ｃａｕｃｈｙ奇异积分，证明了这种奇异分具有与复情形时有类似的边界性质，在边界是Ｃ′光滑的条件下我们明Ｐｌｅｍｅｌｊ公式和Ｐｒｉｖａｌｏｖ定理。一些结论是新的而另一些改进前人的工作。     

复双球面上变系数奇异积分方程的正则化

利用复双球面上的立体角系数的方法和置换公式,讨论复双球垒域上变系数奇异积分方程的正则化问题,推广了复超球面上变系数奇异积分方程的结论．     

一类复超球上的Riemann边值问题及其应用

本文将推广一维的 Riemann 边值问题(可参考路见可教授[2])提出复超球上的内外值函数的定义和 Riemann 边值问题,我们将先讨论内外值函数的性质,给出一类Riemmann 问题的解,最后给出一类复超球上一类奇异积分方程的解的具体形式:     

在Rd上凸体的双弦幂积分

本文给出在Rd上凸体的双弦幂积分概念,并得到双弦幂积分不等式、双弦幂积分与弦幂积分的关系和球体的双弦幂积分值.     

Numerical evaluation of the two-dimensional partition of unity boundary integrals for Helmholtz problems

There has been considerable attention given in recent years to the problem of extending finite and boundary element-based analysis of Helmholtz problems to higher frequencies. One approach is the Partition of Unity Method, which has been applied successfully to boundary integral solutions of Helmholtz problems, providing significant accuracy benefits while simultaneously reducing the required number of degrees of freedom for a given accuracy. These benefits accrue at the cost of the requirement to perform some numerically intensive calculations in order to evaluate boundary integrals of highly oscillatory functions. In this paper we adapt the numerical steepest descent method to evaluate these integrals for two-dimensional problems. The approach is successful in reducing the computational effort for most integrals encountered. The paper includes some numerical features that are important for successful practical implementation of the algorithm.     

一类双中心平面二次系统的Abel积分零点个数

利用Abel积分与第一、第二型完全椭圆积分,本文研究一类具有两个中心奇点的平面二次系统在n次小扰动下的Abel积分零点个数上界问题,得到了较小的上界估计．     

Transformation of hypersingular integrals and black-box cubature

In this paper, we will consider hypersingular integrals as they arise by transforming elliptic boundary value problems into boundary integral equations. First, local representations of these integrals will be derived. These representations contain so-called finite-part integrals. In the second step, these integrals are reformulated as improper integrals. We will show that these integrals can be treated by cubature methods for weakly singular integrals as they exist in the literature.

     

On the Hilbert formulas on the unit sphere for the time-harmonic relativistic Dirac bispinors theory

In this paper there are established some analogues of the Hilbert formulas on the unit sphere for the theory of time-harmonic (monochromatic) relativistic Dirac bispinors. The formulas relate a pair of the components of the limit value of a time-harmonic Dirac bispinor in the unit ball to the other pair of components. The obtained results are based on the intimate connection between time-harmonic solutions of the relativistic Dirac equation and the three-dimensional α-hyperholomorphic function theory. Hilbert formulas for α-hyperholomorphic function theory for α being a complex quaternionic number are also presented, such formulas relate a pair of components of the boundary value of an α-hyperholomorphic function in the unit ball to the other pair of components, in an analogy with what is known for the case of the theory of functions of one complex variable.     

Sharpness of the Korányi approach region

We prove a Littlewood-type theorem which shows the sharpness of the Korányi approach region for the boundary behavior of Poisson-Szegö integrals on the unit ball of . Our result is stronger than Hakim and Sibony (1983).

     

积分中值定理中值研究的进一步结果

继续杨彩萍、贾云暖等人对积分中值定理的中值当区间长度趋于零时的渐近性研究,这里又得到系列新结果.     

多复变量的K-拟共形映射

本文研究Cn里的单位球B到Cn里的K-拟共形全纯映射.证明的最后结果是:若f是B到Cn里的K-拟共形全纯映射,满足det(f'(0))=1,则f(B)包含一个半径至少是(CnK)1-n∫01(1+t)N-1/(1-t)2exp{-(n+1)t/1-t}dt的单叶球,其中Cn>1是只依赖于n的常数,当n→∞时,Cn→(10)~(1/2).     

FRACTIONAL INTEGRATION ASSOCIATED TO HIGHER ORDER ELLIPTIC OPERATORS

§1. IntroductionLet L be a homogeneous elliptic operator on L2(Rn) of order 2m in divergence formL = (?1)m|α|=|β|=m?α(aα,β?β), (1.1)where we assume aα,β ∈ L∞(Rn;C) for all α,β. The operator L is associated to the followingform Q(f,g) de?ned o     

First-return integrals

Properties of first-return integrals of real functions defined on the unit interval are explored. In particular, first-return integrals are shown to be continuous but not absolutely continuous.