玻色爱因斯坦凝聚理论及实现BEC的途径

用解析的方程分析了产生BEC的条件 ,总结了玻色———爱因斯坦凝聚的几个成功的实验 ,从而得出在有约束的情况下 ,理想气体发生二维玻色———爱因斯坦凝聚的实验构想     

玻色—爱因斯坦凝聚教学研究

针对热力学统计物理中分布理论的难点,介绍了玻色分布和玻色—爱因斯坦凝聚,阐明了理想玻色气体满足的积分式与求和式之间的关系,分析给出了凝聚态的产生条件。引入与生活相关应用问题激发学生学习兴趣,加深学生对知识点的理解,突破难点。     

有限粒子数效应对任意维量子气体热力学性质的影响

对于束缚在任意维谐振势中的理想玻色气体和费米气体,有限粒子效应对其热力学性质将会产生影响。估计出在不同的情况下,有关于各个热力学量的相对修正。并对两种受限量子气体所得结果进行比较,得出结论：有限粒子数效应对于凝聚状态下的玻色气体（玻色气体在系统中发生玻色爱因斯坦凝聚）的影响要比费米气体和正常的玻色气体（没有发生玻色爱因斯坦凝聚的玻色气体）显著得多。     

浅谈玻色-爱因斯坦凝聚

研究玻色-爱因斯坦凝聚的由来、概念,及其形成条件,以及探讨玻色-爱因斯坦凝聚的应用价值及对相关领域发展的促进作用。     

激光冷却技术及其在玻色-爱因斯坦凝聚中的应用

介绍了激光冷却中性原子的原理,以及玻色–爱因斯坦凝聚的形成条件和实现途径,说明了激光冷却技术在玻色–爱因斯坦凝聚中的应用.     

NLS方程的一种新解

非线性薛定谔方程（NLS方程）是描述玻色爱因斯坦凝聚（BEC）演化的重要方程.本文利用待定系数法,求出了NLS方程一个新的精确解.     

Feshbach共振作用下的玻色-爱因斯坦凝聚

在玻色-爱因斯坦凝聚领域中Feshbach共振是研究的热点，在很多实验中都现测到了Feshbach共振现象．通过调节外加磁场用原子散射的Feshbach共振来任意改变原子间的相互作用，从强吸引到强排斥都可实现．介绍了Feshbach共振现象及有强相互作用的玻色子气体和费米原子对的玻色-爱因斯坦凝聚．     

Bose—Einstein凝聚问题的理论探讨

本文是对Bose—Einstein凝聚问题的理论探讨,主要包括四个方面：（1）玻色子的化学势的特性（2）玻色凝聚现象（3）玻色凝聚发生后玻色气体的宏观性质（4）玻色凝聚形成的物理条件。     

二维自由理想玻色气体

用解析的方法分析了二维自由理想玻色气体的热力学性质,结果表明,在没有外势约束的情况下,二维理想玻色气体不能形成了玻色--爱因斯坦凝聚.同时讨论了在强简并和弱简并两种情况下二维自由理想玻色气体的热容、熵和压强.在弱简并情况下,二维自由理想玻色气体的热力学性质趋于经典情况.     

单组份玻色-爱因斯坦凝聚体基态稳定性研究

利用数值方法和托马斯费米近似求解非线性薛定谔方程(Gross-Pitaevskii方程),应用量子变分原理分析化学势随一维散射强度的变化,研究玻色-爱因斯坦凝聚体基态稳定性,并计算了7Li原子最大凝聚原子数.     

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.