四阶抛物型方程一个两层的高精度隐式格式

对四阶抛物型方程构造一族新的含参数隐式差分格式，适当选取参数时，可得到一个高精度恒稳格式，其截断误差达到O[(△t)^2 (△x)^8]，数值例子表明该格式是有效的。     

四阶抛物型方程一族三层的高精度隐式格式

对四阶抛物型方程构造一族新的含双参数三层隐式差分格式，并证明该族格式对任意非负参数都是绝对稳定，并且其局部截断误差达到O[(△t)^2 (△x)^8]，通过数值例子表明该格式是有效的．     

四阶抛物型方程的一个新的高精度显格式

给出解四阶抛物型方程的一个新的显式差分格式 ,其截断误差和稳定性条件分别为O(△t2 △x6 )和r=△t/△x4 <1/ 16.     

解四阶抛物型方程的一族恒稳隐式格式

对四阶抛物型方程构造一族新的含参数隐式差分格式，它包含了许多名格式，适当选取参数时，可得到一个高精度恒稳格式，其截断误差达到O[（Δt)^2 (Δx)^6)]，数值例子表明该格式是有效的。     

二维热传导方程的一个新的两层显式格式

构造了一个二维热传导方程的两层显式格式,截断误差为O(△t △x2),稳定性条件为r=t/x2=t/y2<1/2,优于同类的其它显式格式。     

基于Pade逼近的四阶抛物型方程高精度差分格式

文章基于Pad6逼近,针对四阶抛物型方程周期初值问题。构造了一个无条件稳定的高精度的两层隐格式。它的局部截断误差为0（（△t）^2＋（△x）4）,△t与△x分别为时间和空间步长．误差分析和数值实验均表明,构造的格式比Saul’ev构造的格式精度要高10^-4 - 10^-5阶．从精度及稳定性方面考虑,所构造的格式也比文[4]的显式格式要好．     

解四阶抛物型方程高精度两层显格式

给出了一个求解四阶抛物型方程高精度两层显式差分格式,证明了其截断误差为O（τ^2＋h^8）,稳定性条件为r=τ/h^4≤264/3601.     

解抛物型方程的一族高精度差分格式

用待定参数法对一维抛物型方程构造了一个双参数高精度恒稳定的隐式差分格式，截断误差达O（△t^3 △x^4)，可用追赶法求解。     

Schroedinger方程的一个显格式

本文构造了一个解Schroedinger方程的三层显式差分格式．格式绝对稳定，截断误差为O(τ^2 h^2)．     

解抛物型偏微分方程的一个高精度格式

用待定系数法给出了解一维抛物型偏微分方程初边值问题的两层显格式,此格式的截断误差为O(2τ+h4),且格式在2/9相似文献   

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.