河床流体模型方程的显式精确解

结合直接方法和假设方法得到了河床流体模型方程及其推广的一些显式精确行波解，这些解包括孤立波解、奇异行波解和三角函数状周期波解。     

一类含时滞反应扩散方程波前解的存在性

研究一类含时滞反应扩散方程δu/δt（x，t）=δ^2u/δx^2（x，t）＋u（x，t）（a＋bu（x，t—τ）-c^2u^2（x，t—τ））的波前解，其中x∈R，t≥0，a〉0，c≠0，b∈R，通过构造合适的上下解，证明了当时滞充分小时，方程存在波前解，用线性化方法，给出了存在波前解的τ值的一个估计。     

关于Burger方程的解

本文利用简单变量代换，对Buger方程进行了讨论，得到Buger方程的波前解u=q(x-ct)以及q( ∞)和q(-∞)的值。     

KdV方程的Jacobi椭圆函数求解

把Jacobi椭圆函数展开法扩展到Jacobi椭圆正弦函数、Jacobi椭圆余弦函数和第三类Jacobi椭圆函数，并给出了KdV方程的新的周期解．并且应用这种方法得到的周期解也可以退化为KdV方程的新孤立波解．     

一类(2+1)维非线性波方程新解

使用Jacobi椭圆函数展开法 ,研究 (2 + 1)维KPI方程和 (2 + 1)维Bounessiq方程的周期解和孤波解 ,并借助计算机代数系统Maple ,通过图形分析法 ,给出多解     

用改进的试探函数法求解广义KdV方程

试探函数法求解非线性数学物理中一个非常著名的非线性偏微分方程-广义KdV方程，求得其一般形式的指数函数解，据此不但求得了广义KdV方程的sech^2型钟状正则孤波解，而且求得了其csch^2型奇异行波解，最后，利用一些熟知的数学关系式，又求得其若干其它显式精确解，包括三角函数型周期波解等。     

ＶＢ方程的直接解法

用一种建立在齐次平衡法基础上的直接方法，解得了两种ＶＢ方程的孤波解。     

变更Boussinesq方程新的精确解析解

对齐次平衡法进行了改进，并将其应用于Boussinesq方程中，通过假设一些新的形式解，获得了它的六类精确解析解。     

两类非线性波动方程的形式变量分离法求解

利用形式变量分离法研究了两类非线性波动方程的精确解，给出了其它方法不能给出的孤波解．     

一个反应扩散方程的显式波前解与一个平面三次微分系统的全局分析

本文讨论了反应扩散方程ｕｔ＝ｕｘｘ＋ｕ（１－ｕ）（ｕ－ａ）的行波解Ｕ（ｚ）＝Ｕ（ｘ＋ｃｔ），这里０＜ａ＜１，ｃ≥０。首先得到了４种类型的行波解，它们具有唯一确定的波速或者具有最小波速，然后我们用待定系数法得到了（１）的一些显式波前解。     

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.     

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.