关于波函数一阶导数的连续性

本结合势函数有限跃变和无限跃变的几种实例，讨论波函数一介导数在势函数跃变处的连续性问题，从而进一步明确连续条件。     

关于波函数一阶导数的连续性

结合势函数有限跃变和无限跃变的几种实例，讨论了波函数一阶导数在热函数跃变处的连续性问题，进一步明确了连续性条件。     

广东近四十年来气候跃变特征分析

用Yamamot方法，计算了广东8个测站近40年来的气温、降水、日照量在春、夏、秋、冬季、冬、夏半年和全年的跃变参数序列，通过分析得到：3种气候要素最明显的跃变都主要发生在1980年前后．尤其是广州、深圳、肇庆等站特别明显。日照量的跃变信息在各个时段都较气温、降水量明显得多，其春季又较其他时段的跃变明显；气温跃变最强时期在夏季；降水跃变在各时段没有太大差别，且较日照和气温量的跃变都弱得多。     

换路定则实例

本文就换路对电容电压不能跃变、电感电流不能跃变的一些常见应用做了介绍，并进行了分析，具有一定的技术参数价值。     

电路中电阻、电容和电感元件电学性能分析

电阻器、电容器和电感线圈是性质和功能不同的元件.电阻器是"无记忆"元件,加在它两端的电压跃变,通过它的电流立即跃变.电容器是"记忆"元件,通过它的电流可以跃变,但它两极的电压不能跃变.电感线圈也是"记忆"元件,加在它两端的电压可以跃变,但通过它的电流不能跃变.我们应根据它们的特性,解决有关的问题.     

一般情况下磁场强度矢量切向分量跃变的讨论

该文在回顾矩形回路所在面为电流垂面时磁场强度矢量切向分量的跃变关系的基础上,进一步研究了一般情况下磁场强度矢量切向分量的跃变关系,并获得了一般情况下磁场强度矢量切向分量跃变关系的表达式,将其与矩形回路所在面为电流的垂面时磁场强度矢量切向分量的跃变关系进行比较,发现二者是不同的.     

电容电压和电感电流可以跃变么?

有些同学提出:在分析动态电路时,我们是根据电容电压、电感电流不能跃变来计算电容电压、电感电流的初始值的,那末,电容电压和电感电流不能跃变是不是一个规律?如果说是一个规律,那末,当一个初始电压为零的电容和一个电压源接通时还能运用它来计算电容的初始值吗?如果说不是一个规律,那末,又怎样来理解电容电压、电感电流跃变时所引起的贮能的跃变呢?贮能的跃变要求功率为无限大,实际电路能提供无限大的功率吗?     

换路定则实例

本文就换路对电容电压不能跃变、电感电流不能跃变的一些常见应用做了介绍,并进行了分析,具有一定的技术参数价值.     

换路时电容电压和电感电流跃变的分析

论证了换路时电容电压和电感电流可以跃变,并举例说明,且简要地介绍了电容电压和电感电流跃变的几类电路及初始值的分析方法。     

电容电路教学中的两个问题

在电容电路的教学中有两个应注意的问题。一、电容两端电压的变化有些教材,如沈裕钟主编《电工学》(高等教育出版社,1987)在分析RC串联电路时,提出电容两端电压不能跃变,可在工业电子部分又应用了电容两端电压跃变的特性。     

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?     

Western and Eastern culture differences in commercial field

The communication of people partially is the communication of cultures. Culture has a direct effect on international commercial activities in all aspects. Different conceptions about time, space, equality, law and the like, lead people to deal with things in different ways. So to know cultures of the counterpart is to facil-itate our enterprises so as to have a smooth and successful communication in commercial activity.     

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…     

风的曲线

Rosco and I wait for the fishermen to return.I sit at a wooden bench near the store at Mt.Baker Resort and watch the clouds change shape. Rosco has my belt around his neck and an eight foot tow chain hooked to a tree. Dogs must be on a leash. Ducks and rabbits are loose.