一类含非保守瞬时态的Q—矩阵

既含瞬时态又含稳定态的Ｑ－矩阵的研究比较困难，目前国内外已有的结果不多，且大部分是在Ｑ保守的条件下给出。本文对瞬时态非保守的矩阵Ｑ。给出了存在Ｑ过程的一个充分条件，此条件直接加在矩阵Ｑ上，比较容易检验。应用本文结果，可直接导出［６］中主要结论的充分性的证明。     

瞬时态可和的Q－矩阵

设Ｅ为可列集，Ｑ＝（ｑｉｊ；ｉ，ｊ∈Ｅ）为含瞬时态的拟Ｑ－矩阵，且假定所有瞬时态均可和．在此假定下，本文得到如下三个结果：①准Ｂ型Ｑ过程的存在准则．②Ｑ为Ｑ－矩阵的一个充分条件．③当Ｑ准保守时，Ｑ为Ｑ－矩阵的充要条件．从而找到了瞬时态可和的准保守Ｑ－矩阵的特征．     

单瞬时态Q—矩阵的特征

设Ｑ为单瞬时态拟Ｑ－矩阵，在本文中，我们给出了准Ｂ型Ｑ过程存在的充要条件，特别，当Ｑ为单瞬时准保守时，我们得到了Ｑ为Ｑ－矩阵的充要条件。     

含有限个瞬时态生灭过程的构造

对于一般生灭矩阵Ｑ（不必全稳定），文［１］解决了Ｑ过程和不中断Ｑ过程的存在性及唯一性问题．本文对含有限个瞬时态的生灭矩阵Ｑ，构造了全部Ｑ过程．     

含有限个瞬时态诚实Q过程的唯一性准则

本文对含有限个瞬时态的拟Q-矩阵给出了诚实Q过程存在且唯一的准则。     

“双无限”不中断Q过程唯一性的注记

不中断Q过程的唯一性问题一直是人们非常关心的问题。众所周知,全瞬时态不中断Q过程若存在,则必有无穷多个。因此,人们自然要问:“对于每一个含无穷多个瞬时态的Q-矩阵,如果存在不中断Q过程,那么不中断Q过程是否必不唯一?”。 本文给出了一类含无限个瞬时态和无限个稳定态的Q-矩阵(简称“双无限”Q-矩阵),它们的不中断Q过程存在而且唯一。从而证明了以上猜测不成立。 利用以上结果,本文给出了一类“双无限”Q-矩阵,它们不存在不中断Q过程。由此可知,与全瞬时态情况不一样,对于“双无限”情况,Q过程的存在性与不中断Q过程的存在性不等价。 最后,对某些特殊的“双无限”情况,给出了存在唯一不中断Q过程的充要条件。     

不可和单瞬时Q—矩阵的特征

当有瞬时态存在时,Q 过程的存在问题十分困难,至今结果尚不多。本文考虑单瞬时态。对瞬时态不可和的情况,本文给出了 B 型单瞬时态 Q 过程的存在性准则及不中断 B 型单瞬时态 Q 过程的存在准则。从而对不可和单瞬时 Q 矩阵的特征给出了进一步的刻划。     

含瞬时态、具有突变率的广义生-灭Q-矩阵(Ⅱ)

研究含瞬时态、具有突变率的广义生-灭拟q-矩阵,在Q_(E_0)非零流出下,给出易于验证的Q过程存在性准则,并构造出全部Q过程和全部诚实Q过程,证明了不需附加任何条件,所有诚实Q过程都是遍历的,并求出其遍历测度以及给出诚实Q过程可配称的充要条件。最后给出两个例子以说明本文的结果易于验证。     

含瞬时态、具有突变率的广义生-灭Q-矩阵(Ⅱ)

研究含瞬时态、具有突变率的广义生-灭拟q-矩阵,在QE0o非零流出下,给出易于验证的Q过程存在性准则,并构造出全部Q过程和全部诚实Q过程,证明了不需附加任何条件,所有诚实Q过程都是遍历的,并求出其遍历测度以及给出诚实Q过程可配称的充要条件.最后给出两个例子以说明本文的结果易于验证.     

一类含瞬时态的Q—矩阵

设■其中0≤b_1<∞,0≤q_1<∞,i≥1。本文分别给出了Q为Q-矩阵及诚实Q-矩阵的充要条件,并证明了,如果Q是Q-矩阵,则存在无穷多个诚实Q-过程,对于含有限多个瞬时态的对角形Q-矩阵,也得到类似结果。本文所构造的Q-过程可以用其拉氏变换明显表达出来。     

A REPRESENTATION FORMULA RELATED TO SCHR(O)DINGER OPERATORS

Schr(o)dinger operator is a central subject in the mathematical study of quantum mechanics.Consider the Schrodinger operator H = -△ V on R, where △ = d2/dx2 and the potential function V is real valued. In Fourier analysis, it is well-known that a square integrable function admits an expansion with exponentials as eigenfunctions of -△. A natural conjecture is that an L2 function admits a similar expansion in terms of "eigenfunctions" of H, a perturbation of the Laplacian (see [7], Ch. Ⅺ and the notes), under certain condition on V.     

On a class of self-similar processes with stationary increments in higher order Wiener chaoses

We study a class of self-similar processes with stationary increments belonging to higher order Wiener chaoses which are similar to Hermite processes. We obtain an almost sure wavelet-like expansion of these processes. This allows us to compute the pointwise and local Hölder regularity of sample paths and to analyse their behaviour at infinity. We also provide some results on the Hausdorff dimension of the range and graphs of multidimensional anisotropic self-similar processes with stationary increments defined by multiple Wiener–Itô integrals.     

Qualitative Analysis of Bifurcating Solutions in the Lengyel-Epstein Model

One of the most fundamental problems in theoretical biology is to explain the mechanisms by which patterns and forms are created in the＇living world. In his seminal paper ＂The Chemical Basis of Morphogenesis＂, Turing showed that a system of coupled reaction-diffusion equations can be used to describe patterns and forms in biological systems. However, the first experimental evidence to the Turing patterns was observed by De Kepper and her associates（1990） on the CIMA reaction in an open unstirred reactor, almost 40 years after Turing＇s prediction. Lengyel and Epstein characterized this famous experiment using a system of reaction-diffusion equations. The Lengyel-Epstein model is in the form as follows     

On a class of Riemann surfaces

It is considered the class of Riemann surfaces with dimT1 = 0, where T1 is a subclass of exact harmonic forms which is one of the factors in the orthogonal decomposition of the spaceΩH of harmonic forms of the surface, namely The surfaces in the class OHD and the class of planar surfaces satisfy dimT1 = 0. A.Pfluger posed the question whether there might exist other surfaces outside those two classes. Here it is shown that in the case of finite genus g, we should look for a surface S with dimT1 = 0 among the surfaces of the form Sg\K , where Sg is a closed surface of genus g and K a compact set of positive harmonic measure with perfect components and very irregular boundary.     

(0,1 ;0)-INTERPOLATION ON INFINITE INTERVAL (-∞, +∞)

In this paper, we study the explicit representation and convergence of (0, 1; 0)-interpolation on infinite interval, which means to determine a polynomial of degree ≤ 3n - 2 when the function values are prescribed at two set of points namely the zeros of Hn(x) and H′n(x) and the first derivatives at the zeros of H′n(x).     

CONTENTS OF VOLUME 30

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Instructions for contributions

正Applied Mathematics-A Journal of Chinese Universities,Series B(Appl.Math.J.Chinese Univ.,Ser.B)is a comprehensive applied mathematics journal jointly sponsored by Zhejiang University,China Society for Industrial and Applied Mathematics,and Springer-Verlag.It is a quarterly journal with     

Journal of Mathematical Research with Applications Guide for Authors

正Journal overview:Journal of Mathematical Research with Applications(JMRA),formerly Journal of Mathematical Research and Exposition(JMRE)created in 1981,one of the transactions of China Society for Industrial and Applied Mathematics,is a home for original research papers of the highest quality in all areas of mathematics with applications.The target audience comprises:pure and applied mathematicians,graduate students in broad fields of sciences and technology,scientists and engineers interested in mathematics.     

Staircase transportation problems with superadditive rewards and cumulative capacities

A cumulative-capacitated transportation problem is studied. The supply nodes and demand nodes are each chains. Shipments from a supply node to a demand node are possible only if the pair lies in a sublattice, or equivalently, in a staircase disjoint union of rectangles, of the product of the two chains. There are (lattice) superadditive upper bounds on the cumulative flows in all leading subrectangles of each rectangle. It is shown that there is a greatest cumulative flow formed by the natural generalization of the South-West Corner Rule that respects cumulative-flow capacities; it has maximum reward when the rewards are (lattice) superadditive; it is integer if the supplies, demands and capacities are integer; and it can be calculated myopically in linear time. The result is specialized to earlier work of Hoeffding (1940), Fréchet (1951), Lorentz (1953), Hoffman (1963) and Barnes and Hoffman (1985). Applications are given to extreme constrained bivariate distributions, optimal distribution with limited one-way product substitution and, generalizing results of Derman and Klein (1958), optimal sales with age-dependent rewards and capacities.To our friend, Philip Wolfe, with admiration and affection, on the occasion of his 65th birthday.Research was supported respectively by the IBM T.J. Watson and IBM Almaden Research Centers and is a minor revision of the IBM Research Report [6].