诱导增强吸收介质表面的反射双稳性

分析了诱导增强吸收介质表面反射率的非线性性质,指出了一种简单情况下也存在双稳状态的可能性,由此提出了一种新的、并且是极为简单的光学双稳器件原理.     

掺Er~（3＋）光纤的光学双稳与多稳的相干控制

本文研究掺Er3＋光纤系统中的光学双稳和多稳,定性分析了双稳态的形成机理.通过理论衍生公式对系统特性进行拟合,在改变相干场的拉比频率和耦合方式的情况下,对系统的双稳与多稳能进行有效的控制.     

双光子光学双稳系统的混沌控制

把对有限维离散化系统混沌控制的方法应用于高维微分动力系统 ,讨论了双光子光学双稳系统中的混沌控制 .通过数值计算 ,对双光子光学三稳态中的不稳定 1周期极限环和 2倍周期极限环进行了控制 ,并讨论了控制系统对噪音的依赖性问题 .计算结果表明 ,该方法对高维微分动力系统中的混沌控制是有效的 .     

半导体的光学非线性与光学双稳

本文是对近年来光学双稳领域的进展的简介与回顾,着重介绍了解释(?)子饱和吸收和非线性色散的二能级模型,讨论了几种测量激子吸收的实验方案,并且提出了自己的实验设计方案。     

双随机相位编码光学加密系统的安全性分析

阐述了双随机相位编码技术以及常见的攻击方式,分析了双随机相位编码光学加密系统的安全性。结果表明,双随机相位编码光学加密系统能很好地抵抗暴力攻击,但在已知明文攻击、选择明文攻击、唯密文攻击下可以获得加密系统的密钥,存在巨大的安全隐患。     

光学双稳系统的有序与无序

本文讨论了定态情况下吸收型光学双稳系统中的有序与无序的问题.我们发现,在高透分支上原子的无序行为占优势,相应功率耗散比较大;而在低透分支上有序行为占优势,功率耗散比较小.同时还提出了高低透分支间的相变潜热问题.     

环形腔吸收型光学双稳器件的静态研究

本文以二能级均匀展宽原子系统的 Maxwell—Bloch 方程的静态解为基础,对环形腔吸收型光学双稳器件作了较全面的静态研究。推导出了此器件具有光放大性的条件和光放大区的范围,求出了此双稳器件差分增益的最大值,及此时的归一化入射光强和透射光强,并推导出了此器件差分增益最大值随合作参数的变化规律。同时,证明了这一器件不可能作为光强稳定器。     

新型光学双稳器件及基本光学逻辑门

本文研究了一种用雪崩异质结光晶体管和半导体激光器组成的新型光学双稳器件，讨论了在稳态工作时该双稳器件的四种工作模式。当其工作在光学双稳态模式时，最小临界触发光功率小于 １０ｕＷ，高态输出光功率大于 １ｍＷ，高、低态输出光功率之比大于４ｄＢ。用该双稳器件实现了与、或、非、与非、或非五种基本光学逻辑功能。     

金属颗粒复合介质的光学双稳态

本文应用平均场近似和谱表示方法研究了线性金属颗粒嵌入弱非线性电介质基质的复合介质的光学双稳行为．研究结果表明,光学双稳的阈值强度与金属分量的体积浓度密切相关,并且存在着一个体积浓度的阈值,一旦超过这一阈值．双稳态将消失．本文还研究了组分的介电常数以及三阶非线性极化率对光学双稳特性的影响．     

非线性光纤光栅双稳特性研究

从非线性耦合模理论出发,对非线性光纤光栅双稳特性作了理论研究,并采用数值模拟的方法研究了非线性布喇格光栅双稳态对光栅内部参数的依赖性.结果表明:非线性光纤光栅双稳特性对光栅本身的耦合系数和光栅长度具有一定的依赖性,合理选择光栅的长度和耦合系数可以改善双稳的开关阈值、环的宽度以及开关对比度.     

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     

An affordable accurate evaluation of the binding conformations predicted by molecular docking studies in bio-system

Franck-Condon factors bridge the gap between theoretical modeling and experimental observations for molecular electronic spectroscopy and electron transfer.Under the displaced harmonic oscillator approximation,multidimensional Franck-Condon factors are decomposed into a product of many one-dimensional(1D)Franck-Condon(FC)factors,and each 1D-FC factor is associated with one Huang-Rhys factor that determines the leading contribution of     

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