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Finally the effect of quantum lattice fluctuation in exciton state is studied by variational method.

论文的最后研究了量子晶格涨落对激子态的影响，通过对哈密顿量的幺正变换，得到激子态的激发能，对计算结果进行分析最后给出结论。

First,we have studied the superfluorescence of the low density excitons in the thincristalfilm(two layers or three layers cristal lattice).

我们首先研究了薄晶片中低浓度激子的超荧光。

In this paper we have characterized the structure of various twist interfaces which are composed of (001 ),(011),(111 )-oriented semi-infinite crystals of four face-centered cubic metals Ag, Au, Al, Cu and (001),-oriented semi-infinite crystals of Si respectively with the coincidence site lattice, and calculated their energy with Modified Embedded Atom Method.

本文采用重合位置点阵的方法表征了Ag、Au、Al和Cu四种面心立方金属的(001)、(011)和(111)取向的半无穷大晶体分别与Si的(001)和(111)取向的半无穷大晶体构成的扭转界面的结构，并应用改进嵌入原子法计算了它们的能量。

Consideration of microstructure, the metal material has a face-centered cubic lattice of the austenitic steel, Reducing Valves copper and aluminum do not appear in the low temperature low temperature brittleness, but the hardness of aluminum and aluminum alloys is not high, the sealing surface of the wear-resistant aluminum , anti-scratch performance is poor, so the use of low-temperature valves have certain limitations, only used in low voltage and small-caliber valve.

从金相考虑，金属材料中具有面心立方晶格的奥氏体钢、铜和铝在低温状态下不会出现低温脆性，但因铝及铝合金的硬度不高，铝密封面的耐磨、耐擦伤性能差，所以在低温阀门中的使用有一定的限制，仅用于低压和小口径阀门中。

The lattice is minimal and maximally factorized, it can help us understand program. By analyzing the usage of the hierarchy with a set of applications, the technique is capable of finding design anomalies in the origin class hierarchies, such as redundant member or splitting a class into multiple classes, which can help us in restructuring class hierarchies.

最终得到的概念格不仅具有最小性、最大分解性以及其他一些重要的语法特性，而且可以帮助理解程序，通过应用程序对类层次结构的使用可以发现类层次结构的设计问题，比如存在没有使用的冗余类成员，或者类分割问题等，从而为再工程的类库重设计提供一些参考。

Then show the importance of Overlap fermion after comparing variant lattice fermions.

然后通过比较各种费米子，得出Overlap费米子的重要性。

In Chapter Two, we introduce the Dirac Fermion as the low energy excitations of the graphene, based on the field theory. We then discuss two-dimensional honeycomb lattice in the nearest-neighbor tight-binding model.

在第二章里，我们研究最近邻紧束缚模型下的二维蜂窝结构的电子态，然后讨论对应的场论模型，即一维Dirac Fermions 模型，最后引出有效质量方程。

For many years, the Lattice QCD's researchers were working hard try to solve the difficulties in the theory, e.g. the doubling of fermion and the breaking of chiral symmetry.

近年来，格点QCD研究人员一直致力于解决格点QCD存在的困难：费米子加倍效应与手征对称性破缺。

The results show that, for the elasto-plastic contact of tip-substrate approach and separation process, the material plastic yielding in the atomic level is still governed by the von Mises criterion. For the adhesion of flat-ended wedges, continuum mechanics can be still applied down to a few lattice constants within the contact region, and give reasonable results, apart from the discrepancies near the contact edges. Moreover, adhesion hysteresis occurs during unloading due to the atomic steps, where the unloading curve does not coincide with the loading one. This in turn supports the presumption proposed by Pollock for the adhesion of stepped spheres.

本文首先对针尖—基体模型的弹塑性接触机理进行了深入研究，指出在原子水平上材料的塑性屈服仍由Von Mises准则控制；对平底锥冲头粘着接触的模拟表明，除了在接触区边缘附近有一定差别外，接触力学方法在接触区内几个晶格常数范围内仍能给出令人满意的结果；由于原子台阶效应，加载与卸载曲线不重合，出现粘着滞后，证实了Pollock关于具有纳米阶梯结构的球体粘着滞后现象的推测。

At the same time, mass production of wooden lattice door mats and cushions, floc coconut, palm floc, sisal floc, water straw, paper rope, such as hand knitting material and packet edge sisal, straw carpets, car mats foot indoor carpet, cups mats, paper cloth, sisal wallpaper single fiber mesh such as woven fabrics, as well as for the export of all types of small packing rope type, line type of environmentally friendly products.

同时亦大量生产门口垫及木格座垫，椰絮，棕榈絮，剑麻絮，水草绳，纸绳等手工编结物和包边剑麻，草绳地毯，轿车室内垫脚毯，杯垫，纸布，剑麻单纤维墙纸网布等机织物以及各类专供出口的小包装绳类、线类环保产品。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。