矩正合列的刻画

通过对短正合列的进一步研究,对其常见的性质加以归纳,并给以推广,得到了短正合列的一些相关性质.     

可裂模

本文中引入可裂模和可裂性概念，刻划了具有可裂性模的结构，研究了短正合序列的可裂性。     

函子Z（-）的正合性

要：讨论S-系范畴函子Z(-)的正合性,证明函子Z(-)是左正合的,且给出它是正合的一个充要条件．     

函子Z(—)的正合性

本文讨论了S—系范畴函子Z(— )的正合性 ,证明了函子Z(— )是左正合的 ,且给出了它是正合的一个充要条件     

模的几个正合列

从一些已知的正合列出发,推导了一些与其相关的正合列.     

左S—系范畴的正合列

本文给出了左S—系范畴中正合列的概念,并证明了类似模范畴正合列的某些重要性质。在本文中,我们还证明了:左S—系M是投射的当且仅当Homs(M._)正合;左S—系M是内射的当且仅当Homs(M._)正合。     

Hom函子左正合的逆定理

线性代数中最基本的定理是Hom函子的左正合性定理，本文证明了它的逆命题。     

关于Gorenstein FP-内射模

R-模M称为是Gorenstein FP-内射的,如果存在一个FP-内射R-模正合列…→E1→E0→E0→E1→…,其中M=ker(E0→E1),使得对任意FP-内射模E,Hom(E,-)保持正合列正合.根据定义讨论了Gorenstein FP-内射模的性质,并且证明了若环R是左Noetherian环当且仅当每个Gor...     

余有限分裂

GORO.AZUMAYA在文献[1]中将纯正合列中的有限分裂情形进行了研究,V.A.HIREMATH等人在文献[2]给出了余纯正合列及余纯单态的概念并进行了系统的研究.本文给出了余有限分裂正合列,对余有限分裂正合列及余有限分裂单态射的性质作了讨论,得到了正合列是余有限分裂的两个充要条件.     

好险啊

胖胖鼠从猎人家的垃圾堆里，捡到了一张黄鼠狼皮。“扮成黄鼠狼玩玩!”他把黄鼠狼皮裹在身上，嘿．正合身。活脱脱一只黄鼠狼!     

关于钢筋混凝土框架短柱的几点讨论

框架柱因其剪跨比较小而多属于短柱甚至超短柱。本文准确给出短柱判定条件,分析了钢筋混凝土短柱和超短柱在水平地震荷载作用下的破坏模式,针对短柱的变形能力和延性差、从而导致框架结构的整体抗震性能下降的问题,建议改善其抗震性能的各种有效措施,其结论可为工程设计人员提供参考。     

Abel范畴上生成子和余生成子的若干注记

设x,y,w,v是Abel范畴Α的子范畴,其中w?x且v?y.本文研究当w是x的余生成子,v是y的生成子时,x与w以及y与v在正合列中的若干联系和性质.     

Being Emotionally Independent Instead of Suffering——A Feminist Analysis of "How I Finally Lost My Heart"

"How I Finally Lost My Heart" is a short story written by Doris Lessing,the winner of the 2007 Nobel Prize in literature.Unlike her novels,Doris Lessing’s many short stories are less mentioned or studied by Chinese researchers and scholars,especially "How I Finally Lost My Heart".Therefore,this paper is intended to analyze this short story from the feminist perspective,and attempts to show the exact process of women’s emotional independence as well as highlight the writer’s deep concern on women’s thorough liberation.     

Sir alfred bray kempe — An amateur kinematician

A short biography of A B Kempe is followed by discussions on his contributions to mathematics in general and kinematics in particular. Kempe’s theorem, mechanisms for generating exact straight line, for rectilinear translation, palgiograph, angle trisector and focal mechanisms are presented.     

短信文学研究综述

短信文学研究相对于短信文学的发展是滞后的,也不够深入和系统。研究内容主要集中为:一是对于短信文学身份的确认问题。一些作家和批评家主要是感悟即兴式的,缺乏从学理的角度进行卓有说服力的分析和认定。二是对于短信文学的特征的分析。虽然许多研究者从不同角度对于短信文学的特点作出了归纳,在一定程度上揭示了短信文学的特点,但都显得偏于一隅,不够全面,有的甚至是不够准确,或是未抓住短信文学的本质特征。三是对于短信文学的分类。各家在对短信文学分类的时候,主要是标准不统一,类别过于粗略,从文体方面关注不够。四是对于短信文学的修辞学分析。除少量文献涉及的修辞方法较为丰富以外,其它均未能充分反映短信文学修辞运用的全貌,对于修辞表现的新动向也关注不够。另外,存在许多空白或涉足不深的研究领域。     

基于Grüwald-Letnikov定义的分数导数数值算法(英文)

基于Grüwald-Letnikov定义提出几种分数导数的数值算法,同时给出算法的时间复杂性,证明了一个有用的递推关系,分析运用了短暂记忆原理.数值实例表明算法有效.     

主零化子-平坦模的等价刻画及性质

将平坦模的理想条件弱化为主零化子理想条件,给出了主零化子一平坦模的概念,推广了平坦模,并利用×和正合列讨论了主零化子-平坦模的等价刻画．同时从子模、直和与直积等方面讨论了主零化子一平坦模的性质．     

A Longitudinal Investigation of Siblings’ and Friends’ Features of Connectedness and Interaction Quality During Play

The present study examined features of sibling and friend dyads’ connectedness (e.g., length and emotional tone of connected sequences) and the quality of the dyads’ interactions during play from early to middle childhood. Forty-four families with a 4-year-old focal child were observed at Time 1 (T1) and again at Time 2 (T2) at age 7 in two separate play sessions (i.e., sibling and friend). Play sessions were coded for interaction quality (i.e., conflict, cooperation). Based on previous research, features of the sequences (i.e., emotional tone, length of sequence) were compared across relationship and time. Research Findings: Findings revealed similarities in the dyads’ interaction quality, with both siblings and friends increasing in cooperation over time. Similarly, the emotional tone of siblings’ and friends’ connected sequences was more likely to be positive than negative; however, siblings’ sequences were short rather than long, whereas friends’ sequences were more likely to be long than short. Practice or Policy: These findings provide new insights into children’s connectedness in child-child relationships and changes in connectedness across development from early to middle childhood. The study highlights the importance of observing the dyad when using a relationships theory framework to examine children’s interactions.