关于一类Crouzeix-Raviart型非协调有限元误差分析的不等式

关于一类Crouzeix—Raviart型非协调单元,本文给出了从边界积分到单元积分的一个不等式 ∫δkv^2ds≤C（hk）∫kv^2dxdy 中C（hk）的具体值、它在相应的有限元误差分析中将起到关键的作用．     

一类比较积分大小问题的研究

本文对一类比较积分大小的问题进行了探讨,利用定积分的关于比较积分大小的相关结论推导出一类积分（定积分,二重积分,三重积分,第一类曲线积分和第一类曲面积分）关于比较积分大小的相应结论,并给出了详细的推导过程。明确了比较积分大小问题中等号成立的奈件。     

TDDNA程序单点积分的四边边形Mindlin板元

TDDNA 程序是本文作者新研制适用于三维非线性动力响应计算的大型通用程序。四边形Mindlin 板元是该程序单元库中的—类单元.该单元是以 Mindlin 板理论为基础的具有双线性挠度和转动位移场的四边形四结点等参单元。在非线性瞬态分析问题中,为了简化计算和避免剪力闭锁现象的发生,通常采用减缩积分的方法.该程序采用单点积分的方法,使得单元刚度的计算尤为简洁.数值算例表明,可通过适当地调整单元网格,达到解的精度要求.     

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.     

积分区域关于平面对称的三重积分的计算技巧

三重积分是数学分析的重点和难点,给出并证明了积分区域关于坐标平面对称,被积函数关于某变量具有奇偶性的三重积分的计算技巧,进而给出并证明了积分区域关于任一平面对称,被积函数具有某些特性的三重积分计算技巧.     

关于积分半群与积分C-半群的扰动的两个结果

本文中我们讨论n-次积分半群与n-次积分c-半群的扰动，获得了关于n-次积分半群与。一次积分C-半群的扰动的两个结果。     

关于积分方法多样性问题的讨论

本文主要讨论关于积分计算中,多种方法的使用问题。首先介绍了关于换元法的一些技巧及内容,在这些方法与技巧的基础上,给出一个积分方法多样性的例子,具体说明多样性的应用。     

定积分应用中“微元分析法“不可忽视的一个重要问题

本文主要分析了在定积分应用中容易产生的一个误差问题,阐明了其根本原因是关于微元分析法中忽视了一个关于定积分的定义中所描述的"近似替代"的前提条件,并在文章中用一个浅显的例题说明这一条件的重要性.     

关于直线对称区域上二重积分的计算

当积分区域具有对称性,被积函数具有奇偶性时,可以简化二重积分的计算过程。给出并证明了积分区域关于一个坐标轴对称、关于两个坐标轴都对称、被积函数具有某种特性的二重积分计算公式,进而给出积分区域关于任意直线对称的二重积分的计算公式;举例说明了各类重积分计算公式的应用。     

四元数分析中的高阶奇异积分

借助于Hadamard关于高阶奇异积分有限部分的思想,研究关于四元数分析中五类拟Bochner-Marti-nelli型高阶奇异积分的归纳定义,讨论了它们的Hadamard主值的递推公式、计算公式和各种微分公式.在证明了这五种拟B-M型高阶奇异积分的Hlder连续性的基础上,还得到了其各种微分的Hlder连续性.     

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,     

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.     

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.     

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.     

团图为数的图中的闭团贯数

Given a graph G,a subgraph C is called a clique of G if C is a complete subgraph of G maximal under inclusion and |C|≥2. A clique-transversal set S of G is a set of vertices of G such that S meets all cliques of G. The clique-transversal number, denoted as TC (G), is the minimum cardinality of a clique-transversal set in G. The clique-graph of G, denoted as K (G), is the graph obtained by taking the cliques of G as vertices, and two vertices are adjacent if and only if the corresponding cliques in G have nonempty intersection. Let F be a class of graphs G such that F={G|K(G) is a tree}. In this paper the graphs in F having independent clique-transversal sets are shown and thus TC (G)/|G|≤1/2 for all G ∈ F.     

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.