Scott连续自映射的不动点

通过研究连续Domain上Scott连续自映射(特别是L-domain之间的稳定映射以及FS-domain之间的一致交换映射)的不动点全体之集的性质,对Lawson和Mislove于1990年提出的一个问题作出了回答.     

人口发展过程的场论形式和分析

本文通过定义生命线概念引出以场论方法描述人口动态发展过程。提出回溯期望寿命概念和计算方法;某年度死亡人口平均死亡年龄和期望寿命之间的数学关系式;以及生育模式和多年前出生人口之间的关系;并探讨了消除人口周期性生育高峰的控制方法。     

带非局部扩散项的一般性霍乱模型的行波解

该文研究一类具有一般性的带非局部扩散项的霍乱模型,用不同的函数表示人与人之间以及人与环境之间的发生率,以及霍乱病菌的增长函数.当R₀>1,c>c^*时,通过构造上下解函数,结合Schauder不动点定理讨论该模型行波解的存在性,再构造Lyapunov函数讨论行波解的渐近性.当c*时,通过双边拉普拉斯变换和Fatou引理证明该模型行波解的不存在性.     

基于几何距离和混合平均算子的群决策一致性分析

对基于几何距离和混合平均算子的群决策一致性问题进行研究.定义两个直觉模糊数的几何距离和相似度以及群决策下基于混合平均算子的直觉判断矩阵之间的集成方法;给出群决策下判断矩阵之间的相似度计算公式;归纳群决策一致性分析的步骤;最后通过例子对该方法进行说明和分析.     

α函数的平台和c-极小同宿轨

虑了具有某种双曲性的正定Lagrange系统的α 函数平台的结构以及建立起了该平台的边界与Aubry集的c-极小同宿轨之间的关系.     

交换环上GL3的同构

本文对交换环A和R讨论E₃(A)和E₃(R)之间以及GL₃(A)和GL₃(R)之间存在例外同构的必要与充分条件.文中给出的反例说明,两个不同构的环可以有同构的线性群.这部分地回答了代数群抽象同态会议所提出的一个公开问题.     

X射线准周期振荡现象的新差频模型

本文利用吸积盘理论的α模型以及内盘的边界条件来改进原来解释X射线准周期振荡现象中振荡频率与X射线强度之间关系的差频模型,改进后的模型同观测符合得很好,并且能同时解释某些源的振荡频車与强度之间关系的正相关部分和负相关部分。     

ALp -空间的单位球面上Lipschitz映射的等距延拓

该文研究了L^p(Ω,∑,μ; L^q(X, A,ν)) (2≤qp (Ω,∑,μ; L^q(X,A,ν))(1相似文献   

关于并行迭代区域分解算法收敛性的注记

本文给出在范数Ⅱ·Ⅱ下的收敛估计,以及相应的最优松驰因子,还讨论了这两种收敛性之间的关系.     

服务品牌资产、顾客满意与品牌忠诚的关系研究:基于顾客的视角

通过市场调查,从顾客的视角,实证研究了服务品牌资产、顾客满意和品牌忠诚三者之间的关系,以及转换成本和消费者特征在顾客满意和品牌忠诚之间的调节作用.研究结果表明:基于顾客的服务品牌资产包括物理质量、人员行为、理想自我一致性、品牌认同、生活方式一致性五个维度;物理质量和生活方式一致性对顾客满意具有显著性影响;物理质量、人员行为、品牌认同、生活方式一致性对品牌忠诚具有显著性影响;顾客满意在服务品牌资产对品牌忠诚的影响中起到了部分中介作用;转换成本对顾客满意与品牌忠诚之间关系具有调节作用,但调节效应不显著;消费者特征对顾客满意与品牌忠诚之间关系具有部分调节作用.     

Solving fixed charge transportation problem with interval parameters

In the present paper the fixed charge transportation problem under uncertainty, particularly when parameters are given in interval forms, is formulated. In this case it is assumed that both cost and constraint parameters are arrived in interval numbers. Considering two different order relations for interval numbers, two solution procedures are developed in order to obtain an optimal solution for interval fixed charge transportation problem (IFCTP). In addition, the two order relations are compared to give a better comprehension of their differences. Furthermore, numerical examples are provided to illustrate each of solution procedures.     

THE CONJUGACY PROBLEM IN SMALL GAUSSIAN GROUPS

Small Gaussian groups are a natural generalization of spherical Artin groups, namely groups of fractions of monoids in which the existence of least common multiples is kept as an hypothesis, but the relations between the generators are not supposed to necessarily be of Coxeter type. We show here how to extend the Elrifai–Morton solution for the conjugacy problem in braid groups to every small Gaussian group.     

声速及损耗系数的同时反演

引言 本文讨论有损层状介质的反演问题.有损介质的反演问题的研究,即使是一维情形,也未成熟,且无一般提法.G.Kristensson和R.J.Krueger的一系列文章,利用一般的二次双曲型方程,对有限厚度的介质进行反演,用到的响应信息是透射和反射数据,不     

Finite quantifier hierarchies in relational algebras

For a given structure of finite signature, one can construct a hierarchy of classes of relations definable in this structure according to the number of quantifier alternations in the formulas expressing the relations. In ordinary examples, this hierarchy is either infinite (as in the arithmetic of addition and multiplication of natural numbers) or stabilizes very rapidly (in structures with decidable theories, such as the field of real numbers). In the present paper, we construct a series of examples showing that the above-mentioned hierarchy may have an arbitrary finite length. The proof employs a modification of the Ehrenfeucht game.     

地市级可再生资源能源利用优化

对地市级可再生能源管理问题,建立了在确保有限的传统能源和可再生能源能满足地区各个部门在规划期内的能源总需求条件下,使整个系统的运作成本最低的可再生能源利用优化模型,并根据实际情况假设模型中除太阳能和风能的可利用量为随机变量外,其他参数均为区间数时,利用处理区间数的可能度方法和满意度方法推导该类问题的确定性等价模型．     

一种基于随机占优的多种信息形式的MADM方法

针对具有多种信息形式的多属性决策(MADM)问题,提出了一种决策分析方法。在本文中,首先描述了属性值为随机变量、清晰数和区间数三种信息形式的MADM问题;然后将这三种信息形式转化为带有累积分布函数的随机型信息的形式,并依据随机占优准则判断并确定两两方案之间比较的随机占优关系,在此基础上运用ELECTRE III级别高于关系方法得到方案的排序结果。最后,通过一个算例说明了本文给出方法的可行性和有效性。     

The Category of Equivalence Relations

Algebra and Logic - We make some beginning observations about the category ??q of equivalence relations on the set of natural numbers, where a morphism between two equivalence...     

Euler's problem,Euler's method,and the standard map; or,the discrete charm of buckling

Summary We explore the relation between the classical continuum model of Euler buckling and an iterated mapping which is not only a mathematical discretization of the former but also has an exact, discrete mechanical analogue. We show that the latter possesses great numbers of “parasitic” solutions in addition to the natural discretizations of classical buckling modes. We investigate this rich bifurcational structure using both mechanical analysis of the boundary value problem and dynamical studies of the initial value problem, which is the familiar standard map. We use this example to explore the links between discrete initial and boundary value problems and, more generally, to illustrate the complex relations among physical systems, continuum and discrete models and the analytical and numerical methods for their study.     

考虑复杂搭接关系的灰色网络计划模型

将复杂搭接关系引入灰色网络计划模型,并对搭接关系组合进行了分析.其中,活动持续时间与搭接时距都为灰数且服从三角白化权函数分布并使用核和灰度形式表示,在时间参数计算中引用基于论域的灰度计算法则以解决核与灰度加减运算结果与原灰区间不符的问题,并改进基于相对核与精确度的灰数排序方法以适应本模型考虑白化权函数的情况,同时将关键路径识别放置在最迟时间参数计算之前以解决逆向递推无法正确计算最迟时间的问题.     

Word problems and ceers

This note addresses the issue as to which ceers can be realized by word problems of computably enumerable (or, simply, c.e.) structures (such as c.e. semigroups, groups, and rings), where being realized means to fall in the same reducibility degree (under the notion of reducibility for equivalence relations usually called “computable reducibility”), or in the same isomorphism type (with the isomorphism induced by a computable function), or in the same strong isomorphism type (with the isomorphism induced by a computable permutation of the natural numbers). We observe, e.g., that every ceer is isomorphic to the word problem of some c.e. semigroup, but (answering a question of Gao and Gerdes) not every ceer is in the same reducibility degree of the word problem of some finitely presented semigroup, nor is it in the same reducibility degree of some non-periodic semigroup. We also show that the ceer provided by provable equivalence of Peano Arithmetic is in the same strong isomorphism type as the word problem of some non-commutative and non-Boolean c.e. ring.