Riccati方程的可积新定理

利用Riccati方程的不变量.讨论其可积类型和可积条件.给出可积新定理.     

补充一类可积函数

一股数学分析教材给出了三类可积函数，木文补充一类可积函数，并证明了它的可积性。     

连续函数在开区间内可积性的思考

对于连续函数在闭区间上是可积的,那么,连续函数在开区间内是否可积呢?如果可积的话,需要哪些条件,以及连续函数在开区间上可积还具有哪些性质,这就是本篇文章所要研究的内容。     

Lebesgue积分的一个新的充要条件

根据积分概念,及函数在E上L可积的充要条件是其在E上绝对可积和函数在[a, ∞)上可积的充要条件是其在[a, ∞)上广义R绝对可积,本文给出有有限多个奇点的函数在[a,b]上L可积的一个新的充要条件。     

关于∮性质的σ-积

拓扑性质是否具有可积性，这一直是拓扑学中极为重要的问题，有时甚至有限可积也是极为宝贵的。性质不具有有限可积性。本文研究了另一种重要的乘积空间σ-积中的性质，证明了性质的σ-积定理。     

一类Riemann—stieltjes可积函数

本文在Riemann—stieltjes可积函数的两种不同定义形式下,分别证明了“Riemann可积函数对绝对连续函数是Riemann—stieltjes可积的”这一结论,从而得到了一类Riemann—stieltjes可积函数。     

重积分的概念与计算

重积分的概念与多元函数可积判定、可积性质与可积计算密切相关,准确把握重积分概念的内涵,有助于重积分类问题的完满解决。     

重积分的概念与计算

重积分的概念与多元函数可积判定、可积性质与可积计算密切相关,准确把握重积分概念的内涵,有助于重积分类问题的完满解决.     

对函数f~2与|f|可积性关系的讨论

在华东师范大学数学系编纂的第二版《数学分析》教科书中,有一道习题:讨论f、|f|、f~2三者之间可积性的关系。对于f与|f|之间可积性的关系,教材中已作了详尽讨论;f与f~2之间可积性的关系由教材提供的定理和反例,也极易解决;至于当|f|可积时,由教材中定理,马上可得f~2可积。而当f~2可积时,对于|f|的可积性问题,却使许多读者茫然。本文将在教材系统之下,给出f~2可积时,     

关于积分学中互否概念的教学

本文分析了数学分析中可积与不可积一对互否概念的结构式，并据此导出其对偶定义式，通过例题分析，说明了直接应用定义证明函数可积与不可积的一般方法。     

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.