外磁场中的强耦合极化子性质

运用变分法系统地研究了外磁场下极化子的电声子耦合作用,其中具体考虑了电子和表面光学声子（ＳＯ）的强耦合作用以及与体纵光学声子（ＬＯ）的弱耦合作用,应用Ｈｕｙｂｅｒｔｃｈ提出的变分方法和二次么正变换,给出了电子－声相互作用能,数值结果表明：随着电子和晶体表面距离的增加,电子－表面光学声子相互作用能的数值减小,而电子－体纵光学声子相互作用能的数值增大;磁场增强,电子与两种声子之间的相互作用均增强。     

芳基甘氨酸的不对称合成

介绍了利用手性恶唑啉衍生物的不对称诱导作用，合成具有光学活性的芳基甘氨酸的方法。芳基甘氨酸的总产率为１７％－２４％，光学产率为５．６％－１０．５％。共合成了５个具有光学活性的芳基甘氨酸。     

用二异丙叉甘露醇及非手性脂肪醇改性的LiaLH…

用１，２，５，６－二异丙叉甘露与ＬｉＡＨ４作用，生成手性的二氢络合物，进一步与非手性的一元脂肪醇反应，形成一氢络合物，用它将α－苯丙酮还原为光学活性的Ｒ－α－苯丙醇。在其他条件相同的情况下，非手性的一元脂肪醇的结构对还原反应的光学产率影响较大。其中某些某些伯醇和仲醇可使光学产率达到６２％－６９％，叔醇较差。     

用二异丙叉甘露醇及非手性脂肪醇改性的LiAlH_4对α－苯丙酮的不对称还原反应

用１，２，５，６－二异丙叉甘露醇与ＬｉＡｌＨ４作用，生成手性的二氢络合物，进一步与非手性的一元脂肪醇反应，形成一氢络合物，用它将α－苯丙酮还原为光学活性的Ｒ－α－苯丙醇。在其他条件相同的情况下，非手性的一元脂肪醇的结构对还原反应的光学产率影响较大。其中某些伯醇和仲醇可使光学产率达到６２％～６９％，叔醇较差。     

Salen-Co(Ⅲ)手性催化剂的合成与外消旋环氧化合物的水解动力学拆分

将（S，S）－1，2－二苯基乙二胺（DPEDA）与2－羟基－5－甲基－3－叔丁基苯甲醛缩合，得到手性Salen，再与Co络合，氧化后得到Salen-Co（Ⅲ）手性催化剂，用于催化外消旋环氧化合物的水解动力学拆分，得到了光学活性的环氧化合物和二醇，产率较高，对映体过量20.6%-61.6％。     

(2S,3S)和(2R,3R)紫杉醇侧链异构体的合成

合成了紫杉醇侧链的赤式外消旋体,首次采用（－ ）－α－苯基乙胺为拆分剂,拆分得到紫杉醇侧链的（２Ｓ,３Ｓ） 和（２Ｒ,３Ｒ） 两种立体异构体．光学纯度超过９０ ％ ．     

生物酶促反应合成（S）—苯基—2—2丙醇

（Ｓ）－苯砜－２－丙醇不仅具有抗胆甾脂的活性，而且还是一个非常有用的手性合成子。用自制的溴代丙酮与苯亚磺酸钠反应合成基丙酮砜，然后在面包酵母的作用下还原生成（Ｓ）－苯砜－２－丙醇，并对于干酵母及酵母培养液两反应方法进行了研究。它们具有操作简便、光学产率高等优点，其化学产率大于８０％，光学产率达到９５％。     

（2S,3S）和（2R,3R）紫杉醇侧链异构体的合成

合成了紫杉醇侧链的赤式外消旋体，首次采用（－）－α－苯基乙胺为拆分剂，扩分得一 醇侧链的（２Ｓ，３Ｓ０和（２Ｒ，３Ｒ）两种立体异构体，光学纯度超过９０％     

极性半导体窄量子阱中的激子结合能

计及电子－声子相互作用计算了极性－极性半导体量子阱中激子的结合能．考虑空穴带质量的各向异性,利用变分法计算了在量子阱中与电子和空穴相耦合的两支体纵光学声子模和四支界面光学声子模对激子结合能的贡献．给出并讨论了一些系统的数值结果．结果表明体声子和界面声子对激子的结合能起着重要的作用,结合能的声子效应对电子和空穴的质量比是敏感的．讨论了计算的适用范围     

有限深量子阱中极化子束缚能

本文用改进的Ｌｅｅ－Ｌｏｗ－Ｐｉｎｅｓ变分法研究了界面光学声子，局域体光学声子以及半无限体光学声子对有限深量子阱中极化子束能的影响，得到了电子束缚态能量和极化子束缚能的解析表达式。     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

Design and analysis of generic LBS application developing platform

Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that