超环面弯晶在X射线单色背光成像中的应用

基于Bragg衍射理论,分析了超环面晶体分析器实现等离子体在子午和弧矢2个方向等比例放大成像的原理,采用云母作为衍射晶体,研制了对激光等离子体进行二维成像的超环面晶体分析器,其子午和弧矢曲率半径分别为290 mm和196 mm,用于衍射成像时的Bragg角度为54°.采用铬靶X射线源辐照金属网格目标,网格的网孔尺寸为200 μm×200 μm,通过超环面晶体分析器对铬靶Kα谱线的衍射,在X射线IP板上得到了网格的二维背光衍射图像,并与球面晶体分析器成像效果进行了对比.实验结果表明,与球面晶体分析器相比,超环面晶体分析器可实现在子午和弧矢2个方向等放大比的X射线背光成像,且分析器具有较高的空间分辨力,当光源尺寸为500 μm,成像放大倍数为1.86倍时,其空间分辨力达到67 μm.     

光子带隙结构时域仿真

为了研究光子晶体的能带，利用时域有限差分方法对矩形几何结构的光子晶体进行数值仿真．通过分析光子晶体中电磁场的空间分布和随时间的变化，得到了本征模空间分布与光子能带分布之间的规律．然后通过比较不同波矢和不同能带本征模的空间分布，准确地确定了光子晶体的能带．仿真结果有效地验证了本征模理论，为光子晶体新结构设计提供了重要依据．     

铁磁颗粒膜的自旋激发色散关系研究

应用颗粒膜中颗粒自旋波激发和自旋极化激发的色散关系表达式，对Fe-SiO2颗粒膜进行了计算，探讨其色散规律,结果表明：颗粒自旋波激发与温度无关，而自旋极化激发与温度有关，两者的波谱都随波矢增大而增大，且波矢取分离值，不具有块状晶体自旋波色散关系周期性的变化特征．     

极性晶体中极化子的性质

本文研究极性晶体中极化子的性质，采用微扰法导出了极性晶体中极化子的基态能量和有效质量。在计及电子在反冲效应中发射和吸收不同波矢的声子之间的相互作用时，讨论对极化子性质的影响，结果表明．反冲效应中不同波矢的声子之间的相互作用对极化子自陷能的影响随耦合常数的增加而增大。     

压电半无限空间中的一组表面波精确解

本文用普遍的压电耦合波动方程,详细研究了6mm类晶体半空间中的表面波问题。当弧矢面与c轴垂直时,获得了一对新的准声表面波的解析解,并证明其中之一是Bleustein—Gyulaev波的精确解。     

新型负单轴晶体BaAlBO3F2的频率变换特性

根据相位匹配理论,给出三倍频的参数计算公式。详细计算BABF晶体的相位匹配角、非线性有效系数、走离角、允许角随波长变化的理论曲线,得到了对基频波长为1 064 nm和1 342 nmI类相位匹配的三倍频的相位匹配角、非线性有效系数、谐波走离角、允许角,分别为:74.84°、0.348 6×10-12m/V、0.405 3°、6.465 6 mrad.mm-1和50.87°、0.839 8×10-12m/V、1.448 5°、0.589 0 mrad.mm-1。在考虑走离效应的情况下,研究了三倍频转换效率随BABF晶体长度、基频光光斑半径的变化规律。     

成年太行猕猴枢椎的测量及相关性研究

对１０例（雄５，雌５）成年太行猕猴枢椎进行了全面测量，另算出两项指数，并作了相关分析．结果表明：所有测量指标及两项指数，经ｔ检验，雌雄间没有显著性差异．用矢径、全宽、椎孔矢径与椎孔横径两两组合为６组进行了相关分析，两两均呈正相关；其中矢经与全宽、矢径与椎孔横径、全宽与椎孔横径呈高度相关．并用矢径（Ｘ）与全宽（Ｙ）建立了一元线性回归方程：Ｙ＝２．２３４＋１．０１２Ｘ．     

样品池像散影响光镊聚焦特性的参数分析

根据会聚激光束通过平板型样品池弧矢像散的理论计算结果,全面讨论了相关参数对弧矢像散的影响,其结论对实际操作具有重要的指导意义.     

晶状体核大小的测量及ECCE切口大小的探讨

目的测量巩膜隧道切口白内障囊外摘出述摘出的Ⅱ～Ⅴ级晶状体核的大小，探讨巩膜隧道切口白内障囊外摘除术切口的长度。方法将摘出的晶状体核按颜色分为Ⅱ～Ⅴ，测量各级核的直径、厚度、前面弧长、后面弧长。结果106个晶体核平均直径6．81mm，厚度3．47mm，前面弧长7．28mm，后面弧长8．04mm，Ⅱ～Ⅴ级核各数值依次增加。结论Ⅱ～Ⅴ级核的大小依次增大，手术切口的长度要与核的后面弧长相当，Ⅱ、Ⅲ、Ⅳ、Ⅴ级核推荐平均切口弦长分别为7、8、9、10mm。     

LD抽运Nd:GdYVO4晶体热效应对激光输出特性的影响

使用大功率LD抽运Nd：GdYVO4晶体，分别采用连续抽运和脉冲抽运方式，分析对比了1．06μm激光的输出特性．从速率方程出发，对Nd：GdYVO4晶体的热效应对激光输出特性的影响进行了讨论，从理论上得到了连续抽运和脉冲抽运时激光的输入输出关系，理论与实验符合很好．     

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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