对称性在两类曲面积分计算中的应用

利用被积函数的奇偶性、积分区域的对称性和轮换对称性可以简化积分的计算．讨论了两类曲面积分中的对称性方法,并举例说明其在简化曲面积分计算中的应用．     

对称性在多元函数积分学中的应用

讨论了对称性在多元函数积分学中的应用,具体地给出了利用被积函数和积分区域的对称性来简化重积分,曲线积分和曲面积分的计算方法,并给出了较为详尽的算例.     

对称性在两类曲线积分中的应用

利用积分区域的对称性和被积函数的奇偶性可以简化曲线积分的计算.文章给出平面曲线积分和空间曲线积分的对称性定理,最后总结对称性在两类曲线积分中的应用.     

对称性在定积分近似计算中的应用

在定积分的近似计算中,梯形法、抛物线法往往需要计算的函数值的个数比较多,但对于一些有对称性的函数,在进行定积分近似计算时利用对称性可以减少函数值的计算量.本文将对四种有对称性的函数进行讨论,以供参考.     

对称性、奇偶性在积分计算中应用的一个注解

在积分运算中,对称积分区域以及被积函数有奇、偶性的积分,均可用对称性和奇偶性简化计算.通过对奇偶性、对称性计算积分的五个定理及两个推论进行分析,在实例计算中阐述这些技巧的实用性,有助于学生学习并掌握微积分.     

对称性在积分计算中的应用

在数学范围内,特别是在积分方面,对称性的应用极为普遍.在研究和计算积分类的问题时,对称性的应用对简化解题过程、优化计算步骤的作用十分显著,这也使其成为积分计算中一种不可或缺的手段.利用对称性计算积分主要包括两方面：一是积分区域关于坐标面、坐标轴和原点对称的情况下被积函数具有奇偶性的积分;二是积分区域关于积分变量具有轮换对称性的情况下的积分.本文通过对各类积分的对称性进行归纳总结,使读者能够有效理解和掌握.     

函数的中心对称性及其在定积分中的应用

讨论函数图像的中心对称性及其在计算定积分中的应用.     

复积分中对称的应用

在复变函数的分析理论中,复积分是研究解析函数的重要工具,主要研究对称性在复积分计算中的应用。     

函数对称性简化多元函数积分问题研究

对称性在数学及其更广泛的领域有着重要的意义,在微积分计算中,对称性有着重要的简化运算作用.根据函数的对称性对多元函数的积分问题作深入系统的讨论.     

浅析曲线和曲面积分的奇偶对称性

在计算定积分和重积分中,有时可以利用积分区域的对称性和被积函数的奇偶性来简化计算.但对曲线、曲面积分,绝大多数高等数学教材都没有提及奇偶对称性.同样,曲线、曲面积分也有类似的结论,并且正确灵活运用奇偶对称性,可以将较难较繁的曲线曲面积分的计算简化,达到“事半功倍”的效果.本文从结论上给予整理归纳,并举例说明,以希达到抛砖引玉的效果.     

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.