1—苯甲酰基—3—（4—甲苯基）硫脲的单晶生长及其倍频性能研究

本报道了新型光学晶体１－苯甲酰基－３－（４－甲苯基）硫脲〔ＢＭＢＴ〕的单晶生长和倍频性能，用溶液降温法在氯仿溶液中长出柱状晶体，并对此化合物分子结构和晶体结构对晶体生长及倍频性能的影响作了探讨。     

基于LBO晶体三倍频的激光实验系统的研究

首先简述了晶体的倍频理论,总结了适用于紫外倍频的非线性光学晶体的特性,提出了倍频晶体选择的理论依据,选用KTP晶体,调试出高效腔外倍频绿光激光器。选用LBO晶体,设计出一台紫外激光器,获得稳定的24.3mw的355nm紫外激光输出,转换效率为10.6%。     

无对称中心晶体中直接和级联三倍频效应

考察了无对称中心晶体中三倍频（ＴＨＧ）实验所得的三次谐波信号的来源：直接三倍频和级联效应。给出了在实验中区分这两种效应所产生的ＴＨ信号的方法，这有利于利用ＴＨＧ实验来测量晶体的有效三阶三线性系数分量值。     

甲酸钠晶体生长及其性能

合成甲酸钠晶体，测定其在水中的溶解度。采用降温法从ｐＨ＝９的水溶液中生长出外形完整的大尺寸单晶，并对该晶体进行红外光谱，差示扫描量热测量、晶体透光率和晶体粉末倍频效应测试。还讨论了结构与性能的关系。     

2,4一二硝基苯丙氨酸甲酯及其盐类的单晶生长和倍频效应的探讨

本文提出一种培养具有优良倍频效应的２，４－二硝基苯丙氨酸甲酯（ＭＡＰ）晶体的方法，并研制出综合性能良好的两种２，４－二硝基苯丙氨酸盐类（钠盐和吡啶氢盐）单晶．同时，运用ＥＨＭＯ法计算了ＭＡＰ分子及２，４－二硝基苯丙氨酸根离子（ＩＡＰ）的电荷分布和偶极矩，对这些晶体的倍频效应规律作了初步的探讨。     

高重复率倍频激光器色心调Q器件的研究

研究了色心调Ｑ ＹＡＧ倍频激光器总效率与晶体初始透过率及倍频效率之间的关系，找出了最佳的初始透过率；分析了色心调Ｑ晶体的热力学破坏情况及晶体内部的温度分布情况，在高重复率情况下建立了调Ｑ晶体的热物理模型；测量了不同透过率的晶体的输出能量和脉冲宽度，在散热与不散热状态下测量了晶体的温度场。结果表明，实验与理论相吻合。     

BBO晶体实现超短脉冲I型倍频

分析了BBO晶体实现超短脉冲I型倍频的过程，并介绍了相关的倍频实验过程。忽略群速色散、更高阶非线性作用以及空间衍射效应、走离效应．只考虑相位失配和群速失配的影响．讨论并分析了晶体长度、群速失配对倍频转换效率和二次谐波脉冲波形的影响。     

大功率LD端泵Nd:YAG/LBO蓝光激光器的最优化模式匹配

文章通过分析Nd：YAG激光晶体的准三能级结构,并考虑到大功率泵浦条件下激光晶体中的热透镜效应,采用最简单的平凹腔结构,使激光晶体和倍频晶体分处于两个独立的子腔中,通过ABCD矩阵计算出谐振腔的腔长以及激光晶体和倍频晶体在腔中的最佳位置,实现了蓝光激光器的最优模式匹配,确保了蓝光的高效倍频效率。     

有机倍频晶体4—溴—4′—甲氧基查耳酮(BMC)的研制

本文系统研究了新型有机倍频材料4—溴—4′—甲氧基查耳酮的化学合成、晶体生长及性能测试。在N,N—二甲基甲酰胺(DMF)溶液中用降温法生长得到了5×6×7mm~3的单晶,用蒸发丙酮溶液的方法得到了6×9×9mm~3的单晶,并用X—衍射射线等方法研制了晶体的有关性质。     

偏心度对方形倍频晶体温度场的影响

为了解决非均匀温升对非线性晶体倍频转换效率影响的问题，建立了方形非线性晶体模型．该模型在建立中考虑了基频光具有高斯分布，方形倍频晶体具有周边恒温、端面满足近似绝热等特点．根据非线性晶体腔内倍频的实际需要，给出了方形非线性晶体基频光辐射偏心度的定义，并利用热传导方程，得到了方形非线性晶体受基波偏心辐射时温度场分布的一般解析表达式，解决了在温场模式研究中将倍频使用的方形晶体近似为圆柱形晶体所带来的问题．实验结果表明；当基频光辐射偏心度增大到0．75时，倍频晶体的最高温升下降了21．1％．     

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     

On the Thermodynamic Limit for Responses to Static Electromagnetic Fields

For molecular systems,the quantum-mechanical treatment of their responses to static electromagnetic fields usually employs a scalar-potential treatment of the electric field and a vector-potential treatment of the magnetic field.Although the potential for each field separately is associated with the choice of an(unphysical)origin,the precise choice of the origin for the electrostatic field has little consequences for the results.This is different for the     

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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