多群

In this paper we define distribution cosine functions covering the degenerate case. We also consider the degenerate distribution function generated by a multi valued operator A, its relation to the integrated cosine function and the wellposedness of the degenerate abstract Cauchy problem.

引 言分布半群的概念最早由 L ions在 6 0年代引入，近年来，其他类型的分布半群相继被定义和讨论[1— 4]，由于研究退化线性方程的需要，多值算子对应的 Cauchy问题也开始受到人们关注，在 [2 ，4]中有退化情形的分布半群的定义及研究。

In this paper, some more properties of the existence and conjugacy of complements of a normal subgroup K of a finite group G are studied.

研讨了关于有限群G的一个正规子群K的补子群之存在性与共轭性的更多一些的结果。

This paper presents an adaptive and scalable Web search system,based on a multi-agent reactive architecture,which draws inspiration from biological researches on the ant foraging behavior.Its target is to search autonomous information on particular topics,in huge hyper textual collections,such as the Web,exploiting the outstanding properties of the agent architectures.

受蚁群觅食行为仿生研究和蚁群系统模型理论所启发，提出了一种基于蚁群计算模型的分布、协作多主体（multi-agent）反应架构的自适应、可伸缩的Web搜索系统模型，其由大量智能主体组成，利用智能主体架构的优异特性，旨在从巨型超文档集合中自治地搜索特定主题的信息，从而为用户提供迅捷的信息检索服务。

Our studies mainly focus on the free groups with finite ranks . Free groups with finite ranks are the fundamental subjects of combinatorial group theory, and they have central importance for the studies of both topology and algebra.

我们研究比较多的是有限秩的自由群，有限秩自由群是组合群论的中心课题，是一个在拓扑学及代数学上都具有重要意义的研究对象，获取有关这些自由群的结构的信息的一个主要方法是研究其上的各种自同构作用。

Although many general results in K〓 and relative K〓 theory have been obtained, the determination of structure and the computation of K〓 groups and relative K〓 groups are very difficult.

对于K〓群及相对K〓理论的一般性研究也已取得了较多的成果，但是K〓群及相对K〓群结构的确定和计算却比较困难。

In order to improve the convergence of the back analysis of the rock-fill material parameters, four improved PSO methods have been proposed in this paper. Two are convergence improved PSO, and the others are the PSO based on multi-objective problem.

为提高标准微粒群算法在堆石坝坝料参数反演分析中的适应性，本文采用收敛性改进的微粒群算法和基于多目标问题的微粒群算法，详细阐述了算法的改进原理。

SSR markers are used to do cluster analysis on 100 snap bean germplasms which divided into 6 groups.

利用SSR标记的多态性对100份菜豆种质资源进行聚类分析，根据聚类分析结果，所有供试材料在相似系数为0.33～1.00范围内聚在一起，在阈值0.54处可将所有的种质资源分成六个组群，第一组群主要是由肉质脆的蔓生菜豆构成，这一组群的遗传背景丰富。

Results: There was high detectable rate of Salmonella serotype Derby. Salmonella serotype Agona, and Salmonella serotype Anatum, in both kinds of specimens except high detectable rate of Salmonella serotype Typhi in clinical specimens. Group B of Shigella was the most and Group D took second place. While S. flexneri 2a was detected mostly and 2b was the second.

结果：检出的沙门菌血清型中除临床标本中检出的较多的伤寒沙门菌外，德尔卑沙门菌、阿贡纳沙门菌、肠炎沙门菌和鸭沙门菌在两类标本都有较高的检出率；志贺菌都以B群居多，D群次之，B群中以福氏2 a型检出率最高，2b型次之。

Based on morphological and biological studies, 36character transformation series of 10 species of the genu Apanteles Foerster and 2 species of the genu Dolichogenidea Viereck were recognized. Through analysis of character polarity using the method of outgroup analysis, two and multiple character data matrixe were obtained. The data is analysed through PHYLIP(Phylogeny Inference Package, version 3.6) software based on the method of cladistics, a majority rule consensus tree and a strict consensus tree constructed at last.

在本研究中，描述了10个种，做出了中国绒茧蜂属Apanteles Foerster种类雌蜂检索表，以绒茧蜂属的10个种作为内群，以长颊茧蜂属Dolichogenidea的2个种为外群，基于形态学和生物学分析建立了36个性状演系列，通过外群比较法，得到一个由二性状和多性状数据矩阵，再用phylip(系统发育推断软件3.6版)处理数据矩阵，最后得到一个多数规则合意树和一个严格合意树。

Flooding,as a kind of disturbance events,occurred with higher and higherfrequency over the world.To investigate the effects of flooding disturbance ongrassland vegetation and the soil,a comparatively thorough study was conducted onAneurolepidium chinense grassland in Songnen plain,Northeast China.The studysite was located in Sanjiadian National Rangeland in the territory of Da'an city,Jilirprovince,which was partly flooded in 1998.On the study site,Several transectssubjected to different flooding durations and intensities were designed for thecomparative study among them on such aspects as vegetation characteristics,seedbanks,vegetative propagation of rhizomatous plants,distribution patterns ofpopulations,interspecific relations,and physio-chemical properties of soil.Theresults were as follows:(1)Of the functional group composition of the vegetation,with the elongation of the flooding duration or the increase of flooding severity,theratio of hygric and hygro-mesic plants increase,while that of mesic and mesoxericplants decrease,of Therophytes changed unimodally,of Geophytes increased,whileof Hemicryptophytes decreased.

为弄清草地植被及其土壤环境对水淹干扰的响应，在松嫩平原羊草草地1998年部分遭受水淹的吉林省大安市三家甸子草场内设置了经历不同水淹干扰持续时间和不同水淹强度的样带，并在这些样带之间从植被特征、种子库特征、根茎植物的营养繁殖性能、种群分布格局、种间关系及土壤的理化性质等多个方面展开对比研究，主要结果如下：(1)在植被的功能群组成中，随干扰强度的增加和水淹干扰持续时间的延长，湿生、湿中生类植物功能群的优势度比例基本上是逐渐增加的，中生、中旱生类植物功能群的优势度比例则逐渐减小，而一年生植物的优势度比例呈单峰型变化，地下芽植物比例增加，地面芽植物比例减小。

It seems likely that Kraft will return with a better offer.

看起来卡夫要重新考虑一个更好的出价了。

But he'd rather burn off my feelers and watch me squirm.

可他却放任那个家伙对我为所欲为！