红外激光调Q,锁模染料的研究

合成了６个结构为（ＲＣＳＣＳＲ’）２Ｎｉ的镍铬硫代双烯型红外激光调Ｑ、滑模染料。它们的最大吸收长在９３０￣１４５５ｎｍ。对１０６４ｎｍ激光获得满意调Ｑ。脉宽３￣６ｎｓ；对１０７９ｎｍ及１３４０ｎｍ激光进行锁模，脉宽４０ｐｓ及９０￣１００ｐｓ。     

巨脉冲激光产生的非线性压电效应

当调Ｑ巨脉冲激光聚焦到ＰＺＴ压电陶瓷表面的银膜上时，观察到激光产生的冲击波间的调制现象，这表明在压电陶瓷中巨脉冲激光产生了非线性压电效应。     

同时锁模／调QYAG激光脉冲的形成

分析了同时模／调ＱＮｄ：ＹＡＧ激光的形成过程采用预激光技术实现了锁模／调Ｑ财时运转。讨论了影响预激光的因素。     

连续激励斩光盘式调Q CO2脉冲激光器的研制

针对激光加工的特殊要求,研制出连续激励斩光盘式调Ｑ ＣＯ２脉冲激光器,获得了高重复频率、高峰值功率、短脉宽并具有较高的平均功率和较好模式的ＣＯ２调Ｑ脉冲输出。     

两种被动调Q激光器的比较

对ＬｉＦ晶体调Ｑ与ＳＢＳ相位共轭自调Ｑ这两种激光器分析，比较它们的调Ｑ机理和输出特性。结果表明，ＳＢＳ相位共轭激光器不仅具有自调Ｑ功能，而且可改善光束质量，是一种简便易行、实用的调Ｑ技术。     

Cr4＋∶YAG对于重复频率100Hz的二极管泵浦板条Nd∶YAG激光管的被动调Q

具有高峰值功率、脉宽在ｎｓ范围的激光器已广泛用于科学、军事和工业领域．调Ｑ的Ｎｄ∶ＹＡＧ激光器以及其它调Ｑ的固体激光器可以采用主动和被动调Ｑ元件实现，被动调Ｑ装置有优越于主动调Ｑ装置（如声光调Ｑ、电光调Ｑ）的地方，如工作时不需要另外的附加电源，装置简...     

倍频YAG激光泵浦钛宝石激光器

采用平－平腔结构，实现了电光调Ｑ倍频Ｎｄ：ＹＡＧ激光泵浦的宝石激光运转，最大输出能量为１４．５ｍＪ，最高能量转换放率为３５．６％，波长调谐范围为６７９－８９５ｎｍ，观察到脉宽展宽和延迟现象。     

激光冲击参数优化及激光光路系统配置研究

采用波长相同但脉冲宽度不同的激光对航空铝合金２０２４Ｔ６２进行了激光冲击强化，分析了激光参数，激光装置的光路系统配置，激光冲击区的表面质量及激光冲击强化效果，采用ＫＤ＾＊Ｐ为调Ｑ晶体，三级放大的光路系统能获得最佳的激光冲击参数；脉冲宽度（ＦＷＨＭ）３０ｎｓ，冲击光斑Φ７－Φ１０ｍｍ，能量１５－２０Ｊ。     

Cr^4＋：YAG在Nd：YAG激光器中的被动调Q

在考虑Ｃｒ＾４＋：ＹＡＧ激发态吸收的情况下,给出调Ｑ速率方程组,并且利用计算机对该方程组进行数值求解,从而,描绘出调Ｑ过程中盯关粒子数的变化情况,得到脉冲宽度,脉冲能量,峰值光功率的理论值,采用Ｃｒ＾４＋：ＹＡＧ晶体作为可饱和吸收体,在脉冲式Ｎｄ：ＹＡＧ中实现了１．０６μｍ激光的调Ｑ运转,实验结果与理论结果相符合。     

台式软X射线近贴显微系统

以小型化Ｎｄ：ＹＡＧ调Ｑ脉冲激光产生的高温等离子体作为软Ｘ射线源，采用软Ｘ射线近贴显微技术，建立了台式软Ｘ射线显微系统，得到了图像分辩率高于１μｍ初步结果。     

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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