一维二元Ⅱ型准晶电子态的局域化

研究了Fujita和Niizeki用高维投影法构造的一种一维三元Ⅱ型准晶的电子波函数的性质，波函数二阶矩的数值结果表明，绝大多数的电子态都是局域化的，对几个典型的波函数进行直接观察和进一步多分形分析后确认，在准晶极限，所有的电子态都是局域化的。     

分形子—电子相互作用导致的电阻率

利用推广的Ｈａｎｓｃｈ－Ｍａｈａｎ量子输运方程，求解了分形子－电子相互作用系统的电阻率。克服了电阻率的低温发散困难，给出了电阻率反常处的温度。     

富氮SiOxNy膜的电子注入特性

通过施加直流电压于P型SiOxNy薄膜，使热电子注入到薄膜而引起薄膜电学参数的改变。测试了薄膜在电子注入前后电学参数的变化，以研究薄膜的电子注入特性，探求薄膜的抗电子注入能力与制备工艺之间的关系。结合俄歇电子能谱和红外光谱分析膜的微机结构，对薄膜的电子注入特性进行了理论分析与讨论。     

蒙特卡罗法模拟低失能近轴背散射电子能谱

用蒙特卡罗法模拟了探测到的高能同轴凝散射电子的能谱,分析了入射电子能量、靶原子序数和探测角对归一化能谱的影响,结果表明：当入射电子能量增加和靶原子序数减小时,弹性散射峰值逐渐降低,背散射电子数峰位向低能端移动;探测角的改变对能谱形状基本没有影响,利用较低的入射能量、较大的探测能量窗口和角值有利于背散射率的提高;大的入射电子能量和小的探测能量窗口对应较大的背散射率的相对变化率,探测角值对背射率的相对变化率基本没有影响,可以利用大的探测角值提高背散射率以改善信噪比。     

柱对称超晶格中电子能谱特征探讨

建立了柱对称超晶格异质结构中电子运动满足的薛定愕方程,采用微扰法推导出电子能谱的色散关系;证明了技状超晶格中电子能话存在着容许带和禁带的交错;讨论了共轴异质层厚度以及异质系统核心半径对电子能谱的影响．     

电子能谱法在研究和鉴定固体表面态及组成分布上的应用

本文着重介绍了在对固体表面态和表面组成的研究中,利用俄歇电子能谱(AES)和X光电子能谱(XPS)同扫描电子显微镜(SEM)相结合的方法,能够直接得到二次电子分布的图像表面各元素组分的相对含量以及各元素在不同环境表面所处的价态.通过对几种在不同条件下制备的催化剂及CaSeTe/Ti薄膜电极表面的实际考察,发现制备条件不同时,催化剂的内部结构组成有明显的变化,其表面元素分布也不相同;CaSeTe/Ti薄膜电极氧化层厚度随烧结环境而改变.实验结果表明,电子能谱法在研究固体表面态和组成分布中能给以清晰直观的图像,灵敏敏度高,其测试结果对固体表面态的研究提供十分有用的信息.     

PECVD SiO_2/InP结构的AES和XPS分析

本文介绍了经不同表面处理制成的PECVD Si为_2/InP 結构的俄歇电子能谱(AES)和X光电子能谱(XPS),分析了SiO_2/InP结构介质层、界面过渡区和体内区的化学组分和组志。并研究了表面处理对SiO_2/InP界面过渡区宽度及其化学物理结构的影响。     

CO偶联反应Pd／α-Al2O3催化剂失活的XPS研究

利用失活Pd／α-Al2O3催化剂的X-光电子能谱(XPS)探讨了氨气引起Pd／α-Al2O3催化剂失活的原因．分析认为氨分子在活性组分Pd^2 上的竞争吸附阻碍了催化剂表面上CO偶联反应及活性组分Pd的氧化还原循环，导致催化剂活性下降。     

应用Auger电子能谱仪研究清除GaAs表面碳沾污的有效方法

在制作ＧａＡｓ负亲和势光电阴极中。ＧａＡｓ表面碳的沾污往往严重地降低其光电产额。为了去 除ＧａＡｓ表面碳的污染，我们用Ａｕｇｅｒ电子能谱仪对采用不同化学腐蚀处理的ＧａＡｓ表面进行分析 研究，证明在ＧａＡｓ表面有意形成一氧化膜并装进超高真空系统中加热到－５８０℃，对去除ＧａＡｓ 表面碳污染非常有效。     

次近邻电子跳跃对聚苯胺基态电子结构的影响

在聚苯胺的Baranowski-Büttner-Voit模型基础上,引入了含有次近邻电子跳跃的哈密顿修正项,并推导出相关理论公式.数值计算了完全氧化态的Pernigraniline-base(PNB)和半氧化态的Emeraldine-base(EB)的基态电子能谱结构,结果表明(1)次近邻电子跳跃对能隙和总带宽的影响较小;(2)随着次近邻跳跃强度的增加,PNB聚合物价带宽度将增加,导带被压缩;而EB聚合物的导带与价带均被压缩.     

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.     

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.     

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     

Call for Papers

<正>"The Journal of Shanghai Normal University:Mathematics"is published by Shanghai Normal University as regular issues of The Journal of Shanghai Normal University each year from 2014 in English.The editors-in-chief of the issues are professors Yuhao Cong and Maoan Han.The Journal of Shanghai Normal University was started in 1958 with     

Journal of Donghua University ( English Edition) Contents of Volume 31

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Brief Introduction to “Journal of Jilin University( Science Edition) ”

<正>"Journal of Jilin University(Science Edition)"is a comprehensive academic journal in the fields of science sponsored by Jilin University and administrated by the Ministry of Education of the Peoples Republic of China.The journal started publication in 1955.The original name at starting publication was"Journal of Natural Science of Northeast People University",which was changed into"Acta Scientiarum Naturalium Universitatis Jilinensis"in 1958 owing to the name change of the university.The present journal name has