聚苯乙烯接枝聚甲基丙烯酸甲酯共聚物的合成新方法

聚苯乙烯接枝聚甲基丙烯酸甲酯共聚物的合成新方法①郭金全邹友思戴李宗袁亿文潘容华（厦门大学化学系厦门３６１００５）阴离子聚合［１］和基团转移聚合（ＧＴＰ）［２］技术可分别使非极性单体和极性单体进行活性聚合，得到分子量分布窄、实际分子量和设计分子量相近的...     

物流园区规划建设规模确定的模糊语言多属性群决策模型

结合模糊集理论和多属性群决策理论，提出基于模糊语言多属性群决策的物流园区规模确定模型。模型的主要特点是利用模糊有序加权平均（FOWA）算子对专家给出模糊语言判断信息进行集结，由三角模糊数期望值公式求得物流园区规模影响因素的权重向量；综合考虑定性和定量指标构造决策矩阵，运用模糊加权算术平均（FWAA）算子对各影响因素评估信息进行集成，得到各物流园区的综合评分值，从而得到各物流园区的具体规模。算例表明该模型的合理性和有效性，为客观、科学地规划物流园区规模提供一套可行方法。     

An approach to group decision making based on interval fuzzy preference relations

In this paper, we investigate group decision making problems where the decision information given by decision makers takes the form of interval fuzzy preference relations. We first give an index to measure the similarity degree of two interval fuzzy preference relations, and utilize the similarity index to check the consistency degree of group opinion. Furthermore, we use the error-propagation principle to determine the priority vector of the aggregated matrix, and then develop an approach to group decision making based on interval fuzzy preference relations. Finally, we give an example to illustrate the developed approach.     

一个未定型李代数g(A)的Weyl群和虚根系的结构

本文研究了相应于未定型广义Cartan矩阵A=H98(3)的(非严格双曲型)Kac-Moody代数g(A)的结构,给出了g(A)的Weyl群的性质和分解,并刻划了g(A)的虚根系△ im,进而证明了△ im的运算性质．构造了△ im的一个子半加群,并研究了它的Weyl不变性．     

高职高专院校"双师"型教师队伍构建模式的思考

培养“双师”型教师是高职高专院校师资队伍建设的重要工作。正确认识“双师”教师的内涵。认真分析当前“双师”型教师建设工作中存在的不足,积极探索其构建模式,是做好此项工作的基础。     

粗糙群和基于子群的群的粗糙

运用粗糙集理论的思想，在群中基于子群定义了群的近似空间，并定义了集合的运算，用集合的近似进行了研究．用近似群重新定义了粗糙群理论中的粗糙群、粗糙子群、粗糙不变子群、粗糙商群、粗糙同态、粗糙同构等一系列概念，并在传统的和新定义的两种粗糙群理论体系中，研究了基于子群的群的粗糙的性质．     

论抗战时期第二次粤北会战

为了配合枣宜会战,中日军队于1940年在粤北地区进行了第二次会战。这次正面战场的会战,形势对我方有利,加上我方兵力数量优于敌方,战略部署正确,士兵纪律严明,作战勇敢,又有粤北广大群众和共产党员配合和支持,因而取得了第二次粤北会战胜利。     

乡土医学的人类学分析:以水族民族医学为例

概括了乡土医学的含义,继而以水族医学为个案,从医学人类学的角度分析了乡土医学在现代医学为主流的时代中的角色定位;乡土医学应该如何在全球化的背景下扬长避短、合理发展。     

杨山群的构造特征及对北淮阳区构造演化的意义

北淮阳豫皖交界地区发育有一套含有煤线的杨山群 ,研究表明杨山群发育两期构造变形 ,第一期构造变形 (D1 )为北西西向褶皱及伴生的逆冲断层 ,第二期变形 (D2 )为北西西向的脆性断层。研究区佛子岭群发育三期构造变形 ,不同与前人认识 ,杨山群第一期构造变形与佛子岭群第二期构造变形存在着明显的差异 ,它们不是同一期构造变形的产物。这一新的认识可能预示着在晚古生代时本区北部还有一次重要的构造事件     

Discovery of carbonaceous compressions and their multicellular tissues from the Changzhougou formation (1800 Ma) in the Yanshan range, North China

In 1997 and 1998, hundreds of specimens of megascopic carbonaceous compressions or algal fossils were found from ∼ 1800-million-year old Changzhougou Formation, which is the lowermost unit of the latest Palaeoproterozoic Changcheng Group (∼1 600–1 800 Ma) in the Xinglong-Kuancheng areas at the middle Yanshan Range, North China. They are discoid, ellipsoid and sausage-like, namely shaped likeChuaria Shouhsiennia (Ellipsophyta) andTawuia. By adopting HF acid-resistant maceration coupled with scanning electron microscope and petrologic section, the authors made a preliminary research on the histology for some circular and ellipsoid carbonaceous compressions, namelyChuaria- andShouhsienia-like forms, in addition to their morphology. The following three types of multicellular tissues have been found in the fragments of them: colony-like, pseudoparenchyma-like and parenchyma-like. All of the new data about multicelluar tissues not only supply a very important basis in histology to determine the biological affinity of multicellular algal remains for the Changzhougou carbonaceous compressions newly found, but also provide reliable fossil evidence to prove that metaphytes originated at least 1 800 million years ago.