Some results on renewal equations

In this paper solutions of renewal-type integral equations are studied. It is proved that a recursively spades;efined approximation to the solution has some nice convergence properties. Some simple bounds and other results on the renewal function and the renewal spades;,ensity are obtained.     

On Max-Multiscaling Distributions as Extended Max-Semistable Ones

Abstract

We introduce max-multiscaling distributions as solutions to a functional equation which, in a natural way, extends the one fulfilled by max-semistable distributions. We establish that strictly max-multiscaling distributions are products of at most two max-semistable distributions. Next, we show how to obtain these solutions as limit laws of normalized maximum of suitable independent sequences of random variables when sample size has geometric growth.     

一类n阶非线性微分方程多点边值问题解的存在性

利用Leray-Schauder度理论建立了n阶非线性微分方程y(n)=f(x,y,y′,…,y(n-1)),n≥3,满足多点边界条件yn-1(0)-hyn-2(0)=0,y(i)(ηi)=0,i=0,1,…,n-3,y(n-1)(1)+ky(n-2)(1)=0.的多点边值问题的解存在性的几个充分条件,并给出了应用举例.     

分析电磁散射问题的MGFFT方法

采用多重网格法（ＭＧ）分析电大尺寸物体的电磁散射，这种ＭＧ方法与已有的几种多重矩量法有本质的不同，与其他多层方法相比，它是一种高效率的迭代方法。再利用积分方程的卷积特性引入ＦＦＴ方法快速计算迭代过程中矩阵与矢量的乘积，从而构成ＭＧＦＦＴ新算法，数值结果表明ＭＧＦＦＴ方法具有很高的计算效率，适用于电大尺寸问题的分析。     

弹性力学平面问题的双调和方程的格林函数解法

讨论了弹性力学双调和方程４ Ｕ ＝ ０ 的格林（Ｇｒｅｅｎ） 函数解法     

Pseudo-bayes estimation of multinomial proportions

In the simultaneous estimation of multinomial proportions, two estimators are developed which incorporate prior means and a prior parameter which reflects the accuracy of the prior means. These estimators possess substantially smaller risk than the standard estimator in a region of the parameter space and are much more robust than the conjugate Bayes estimator with respect to parameter values far from the prior mean. When vague prior information is available, these estimators and confidence regions derived from them appear to be attractive alternatives to the procedures based on the standard estimator.     

一类二阶非线性差分方程正解的存在性

主要利用推广的Riccati变换,建立了一类比较广泛的二阶非线性差分方程正解存在的充分和必要条件.     

一类一阶线性方程组的解法

利用复系数的一阶线性方程解公式，给出一类一阶线性方程组的新解性。     

独立反应数及独立反应的确定

根据线性代数原理阐述了复杂反应系统的独立反应数及独立反应式的确定方法     

气泡振动Noltingk-Neppiras方程的解析解的存在性

从Noltingk—Neppiras方程出发，考察了存在外加声场情况下的单气泡非线性振动方程。从理论上证明了该气泡振动方程周期解的存在性，并给出了方程的解析解。