GaAs（100）面上气相淀积生长GaS钝化膜

用加热分解α－Ｇ２Ｓ３的方法在ＧａＡｓ（１００）表面上气相沉积了准单晶的ＧａＳ钝化膜。俄歇电子能谱深度分布测量表明,长成的膜与衬底间界面清晰。用紫外光电子能谱和低能电子能量损失谱结合的方法得到了完整的ＧａＳ／ＧａＡｓ异质结能带结构图,即价带偏移１．５ｅＶ,导带偏移０．３ｅＶ,界面附近存在０．４ｅＶ的能带弯曲。气相淀积方法简单实用,有希望发展成为ＧａＡｓ器件制作的有用工艺。     

存在集中分布界面态的异质结的C—V特性研究

提出用高频Ｃ－Ｖ法测量半导体异质结中集中分布的界面态的能位位置的方法，并分析了测试温度以及由异质结的能带偏移所引起的载流子积累对测试结果的影响，有这一方法对ＧａＳ／ＧａＡｓ和ＺｎＳｅ／ＧａＡｓ两种异质结进行了测试，发现在这两种异质界面上均存在集中分布的界面态，其能级位置分别为Ｅｃ－０．４１ｅＶ，Ｅｃ－０．５１ｅＶ。     

Ar^＋离子注入对Ge／GaAs（100）异质结能带偏离影响的XP…

用Ｘ光电子能谱（ＸＰＳ）方法研究了界面特性和Ｇｅ／ＧａＡｓ（１００）异质结的能带偏离关系。实验表明，当在清洁的ＧａＡｓ（１００）表面生长Ｇｅ异质结时，其价带偏离（△Ｅｖ）与界面特性无关，而在Ａｒ离子注入的ＧａＡｓ（１００）表面上生长的Ｇｅ异质结，其价带偏离与Ａｒ＾＋离子的浓度分布有关。     

双模型三元混晶的界面极化子

采用ＥＰＭＡ近似法,研究了双模型三元混晶界面极化子的性质,计算了ＺｎＳｘＳｅ１－ｘ（ＧａＡｓ）和ＡｌＧａ１－ｘＡｓ（ＧａＳｂ）材料中界面光声子与电子的耦合随ｘ的变化。结果表明,在强电场作用下,界面光声子与电子的耦合加强;体光声子与电子的耦合在ｘ的某一值处存在极小值,界面光声子与电子的耦合随ｘ的变化则较复杂。     

Ⅱ－Ⅵ族化合物半导体薄膜材料的热壁外延生长

本文利用改进了的热壁外延装置，在ＧａＡｓ衬底上外延生长了ＧｄＴｅ，ＺｎＳｅ，ＺｎＳＳｅ，ＺｎＳ等半导体单晶薄膜，ＺｎＳｅ／ＺｎＳ，ＺｎＳＳｅ／ＺｎＳｅ异质结构和ＺｎＳ／ＺｎＳｅ，ＺｎＳＳｅ／ＺｎＳｅ超薄层、多层结构。ＳＥＭ，ＥＭＰＡ，ＸＲＤ及ＰＬ等分析测试结果表明，所生长的半导体薄膜材料具有良好的结晶学性质和光学性质。     

P-GeSi/P-Si探测器的研制

采用ＭＢＥ法在Ｓｉ衬底上生长ＧｅＳｉ异质结,制成ＧｅＳｉ／Ｓｉ异质结探测器。测得其反向击穿电压为１５Ｖ左右,光响应为０．５ｍＡ     

光致发光谱测量掺硅AlGaAs中的DX能级

在调制掺杂ＧａＡｓ／ＡｌＧａＡｓ多量子阱结构的光致发光谱中,靠近强发光峰的低能端存在几个弱峰,且发光强度随温度的增加而变化。这些弱峰是由于掺硅ＡｌＧａＡｓ中ＤＸ中心上的电子向起受主作用的ＳｉＡｓ原子跃迁复合而引起。由此确定ＤＸ中心有四个能级,其激活能分别为０．３５ｅＶ,０．３７ｅＶ,０．３９ｅＶ和０．４１ｅＶ。     

光致发光谱测量掺硅AlGaAs中的DX能级

在调制掺杂ＧａＡｓ／ＡｌＧａＡｓ多量子阱结构的光致发光谱中,靠近强发光峰的低能端存在几个弱峰,且发光强度随温度的增加而变化．这些弱峰是由于掺硅ＡｌＧａＡｓ中ＤＸ中心上的电子向起受主作用的ＳｉＡｓ原子跃迁复合而引起．由此确定ＤＸ中心有四个能级,其激活能分别为０．３５ｅＶ,０．３７ｅＶ,０．３９ｅＶ和０．４１ｅＶ．     

MOCVD制备GaAs／AlGaAs多量子阱的光致发光特性

对ＭＯＣＶＤ生长的ＧａＡｓ／ＡｌｘＧａ１－ｘＡｓ多量子阱结构进行了光致发光特性的测量。结果观察到三个发光峰；位于１．６６４ｅＶ处的峰是自由激子发光；峰值处于１．４８ｌｅＶ的发光是ＧａＡｓ中施主Ｓｉ（Ｇａ）原子上的电子向受主Ｓｉ（Ａｓ）跃迁引起的；而在１．５２９ｅＶ处的弱发光峰是ＧａＡｓ阱层中Ｓｉ（Ｇａ）原子上的电子与价带量子阱中基态重空穴复合形成的。     

GaAs／Al_xGa_（1－x）As异质界面极化子的温度效应

ＧａＡｓ／Ａｌ_ｘＧａ_（１－ｘ）Ａｓ异质界面极化子的温度效应李春圃，班士良（内蒙古大学物理学系，０１００２１，呼和浩特）ＴｅｍｐｅｒａｔｕｒｅＥｆｆｅｃｔｏｆＰｏｌａｒｏｎｓｏｎａＧａＡｓ／Ａｌ_ｘＧａ_（１－ｘ）ＡｓＨｅｔｅｒｏｉｎｔｅｒｆａｃｅ￥Ｌ...     

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