群论中的逆同态与逆同构

研究了群论中逆同态（逆同构）的一些基本性质,得到了群论中同态（同构）和逆同态（逆同构）的相互关系,并用逆同态（逆同构）的方法证明了群论中的同态基本定理和群的同构定理.     

群论中的逆同态与逆同构

研究了群论中逆同态(逆同构)的一些基本性质,得到了群论中同态(同构)和逆同态(逆同构)的相互关系,并用逆同态(逆同构)的方法证明了群论中的同态基本定理和群的同构定理.     

矩阵的自反广义逆和Moore-Penrose逆的求法

根据自反广义逆的性质，本文推证了求矩阵的自反广义逆和Moore—Penrose逆的几种方法。     

Moore-Penrose广义逆与逆矩阵的性质比较

本研究了Moore-Penrose广义逆与通常的矩阵逆在性质上的联系与区别。     

格值矩阵的逆及广义逆

探讨了基于格半群上的矩阵的逆和广义逆等问题,给出了格值矩阵的逆、{1}-广义逆和M—P广义逆的概念和它们存在的条件,以及格值矩阵A的任意一个{1}-广义逆的具体形式、M—P广义逆的存在性和唯一性．     

Moore-Penrose逆与逆矩阵的性质比较

给出了Moore-Penrose逆的定义,研究了Moore-Penrose逆与通常的逆矩阵在性质上的联系与区别。     

分块矩阵广义逆的表示

讨论了分块矩阵的广义逆,以及用矩阵的满秩子块表示广义逆。并给出了矩阵A的Moore-Penrose逆的满秩子块表示,以及分块矩阵存在形如的g-逆的充要条件。     

矩阵的正则逆与定秩广义逆的统一求法

本文推证了定秩的{1}、{2}、{1、、2}广义逆矩阵的统一求法。其结果也使矩阵的正则逆与广义逆的求法得以统一。     

关于逆序列的极限空间

讨论了当逆系统为一逆序列时其极限空间的性质，证明了任一逆序列的极限空间与任一无穷的子逆序列的极限空间是同胚的。     

满单分解矩阵的广义逆

本文引入了满矩阵、单矩阵与具有满单分解的矩阵的概念．研究了它们的性质,以及具有满单分解矩阵的群逆．得到了逆与群逆存在的充要条件及其表达式;最后讨论了逆与群逆之间的关系。     

卡思卡特城堡

It is worthy of noting that, whilst Crookston Castle witnessed the earlier and happier portion of Mary's variegated life,     

不同的吃喝玩乐

一、吃和喝吃苹果 eat an apple, 吃药 take medicine,吃糖 have some sweets,吃饭 have one's meals,吃馆子 dine out,吃惊 be surprised/     

漏洞百出的教育

Many college freshmen arrive woefully unprepared to do college work, and as disadvantaged populations continue to grow, the share of the American work force that has made it through college is expected to plummet. Many experts blame that educational failure not just on high schools but also on colleges. School & College, a special report by The Chronicle, looks at efforts to fix the system. What reforms would better prepare students for college? What should schools and colleges be doing differently? How should state and federal officials help?     

只要努力,不要后悔

There are numbers of crossroads on our long and unpredictable life journey where we totally have no idea about which direction to choose. No matter what our decision is, we should not turn back, but face the music and go ahead instead. I am this kind of girl who always does try without regretting, one example is how I dealt with my love.     

浅谈移民问题

Migration occurs behind a variety of reasons and has a great effect on the whole world. People may migrate in order to improve their economic situation, or in order to escape civil strife, persecution, and environmental disasters. The impact of migration is complex, bringing both benefits anddisadvantages. This paper briefly talks about the causes of migration, the allocation of benefits, and the ways in which individual countries and the international community deal with this important subject.     

Sister Carrie, an Adherent of Desires

Sister Carrie is one of the most controversial characters in American literature.Thought as a "fallen woman" firstly,she was defined as a "new woman" by some critics later. However, by digging into the motivaton behind the whole process of Carrie's "success", the relationship between Carrie and her creator (the author), the social conditions of then American, it can be found that Carrie has never been free-standing on her thought and she has never found her real-sdf even after becoming a famous actress. In a society dominated by mass consumerism Carrie is only an adherent of her own desires. She also is a representative of all those country girls flooded into cities, a symbol and a sacrifice of the urbanization of America in a time countryside was overcome by cities.     

Improvement of one-cycle controller by use of proportional integral differential controller

1.IntroductionOne-cyclecontrolmethod,whichwasproposedaboutonedecadeago[1],hasbecomeanattractivemethodinspecialfieldssuchaspowerfactorcorrection[2-6],switchingamplifiers[7,8],etc.Themainideaofthiscontrollerisbasedonintegrationofdiodevoltageinone-cycleandforcesittobeexactlyequaltothereferencevalue.Themainadvantageofthiscontrollerisitsrealtimeabilitytorejectthevariationofinputvoltage[1].Despitethisgreatability,ithasnogoodperformancesinrejectingofloaddisturbanceandfollowingreferencecommands.Espec…     

库克斯顿城堡

城堡, 是欧洲典型的建筑之一, 每个城堡都有一个美丽的传说或是一段历史。从本期开始, 我们将推出“城堡之旅”, 带各位读者去浏览、观赏欧洲各地的城堡, 开始一段文化与历史的旅途!     

The Reader Response Approach to Teaching of English Literature

During interview with English majors, it was found that a majority of students expressed disappointment with their experience of English literature classes. Students' dislike of learning English literature appears to be the major problem of teaching English literature in China. Reader response approach is a good way to solve this problem. In this paper, I explain the rationale behind the reader response approach, such as its origin, definition, features, assumptions, and strategies. Then I illustrate how reader response approach works as a teaching strategy by presenting several teaching models. At last I evaluate its usefuiness for teachers and present the advantages of reader response approach in Chinese context.