用于光纤放大器的泵浦与信号复用器的研究

光纤复用器是用在光纤放大品将泵浦光与信号光进行复合的关键无源器件，通过理论计算并经实验证实，用两复合波长光功率变化的半周期差控制光纤熔锥长度是制造复用器的有效方法，所研制的熔锥型１．４８／１．５５μｍ、０．９８／１．５５μ，和０．８／１．３μｍ３种泵浦光与信号光的复用器，其附加损耗均小于０．５ｄＢ，波长隔离度均优于２０ｄＢ．     

两亲配合物Cd(HQ)_2LB膜的结构及其电致发光器件研究

制备了两亲配合物二［Ｎ一十六烷基－８－羟基－２－喹啉甲酰胺］合镉［Ｃｄ（ＨＱ）２］的ＬＢ膜材料．采用π－Ａ等温线、紫外可见吸收光谱和荧光光谱等方法研究了ＬＢ膜的结构．结果表明：ＬＢ膜分子排列是二维有序的超晶结构，Ｃｄ（ＨＱ）２分子的两个长链烷基垂直于亚相平面，两个亲水头基（８－羟基喹啉）相对于法线以一定的角度倾斜；Ｃｄ（ＨＱ）２的单分子占有面积为０．７３ｎｍ２，单层高度２．５２ｎｍ．其ＬＢ膜的高荧光性质可作为电致发光器件的发光材料，器件的驱动电压为７Ｖ，最大亮度为１２００ｃｄ／ｍ２．     

自适应非线性符号间干扰的消除

提出了一种改进的非线性符号间干扰的消除技术。在接收机中,采取“先消除后匹配均衡”的结构方案,非线性信道估计器采用一阶Ｖｏｌｔｅｒｒａ核测量及自适应递推算法。与Ｂｉｇｌｊｅｒｉ系统相比,性能可改善２～３ｄＢ．计算量和存储量减少到１／Ｎ（Ｎ为信道响应样值数）．在弥散非线性信道上进行９．６ｋｂ／ｓ数据传输的模拟结果表明,我们提出的非线性消除技术可使１６ＱＡＭ系统的性能改善３～４个数量级。     

一种使用新型的多层折返环绕Banyan网的ATM交换网

本文提出了称为多层折返环绕 Ｂａｎｙａｎ 网的新型 Ａ Ｔ Ｍ 交换网．该交换网由 Ｋ 层 Ｂａｎｙａｎ 交换平面组成,而每个交换使用 ２ｄ×２ｄ 的交换单元构造．并当发生信元交换竞争时,允许信元从一个交换平面交换或溢出到另一个交换平面．将一个交换单元的ｄ 个逻辑上等效的输出链路连接到下一级每个平面一个的ｄ 个逻辑上等效的交换单元的设计方法来提供扩张自由度．满负载下,对于 ４０９６×４０９６ 端口的交换网,使用 Ｋ＝ ｄ ＝ ３ 多层折返环绕 Ｂａｎｙａｎ网,其信元丢失概率 Ｐｌｏｓｓ＜ １０－ ３ ．其性能比纯 Ｂａｎｙａｎ 提高３ 个数量级     

两亲配合物Cd（HQ）2LB膜的结构及其电致发光器件…

制备了两亲配合物二「Ｎ一十六烷基－８－羟基－２－喹啉甲酰胺」合镉「Ｃｄ（ＨＱ）２」的ＬＢ膜材料，采用π－Ａ等温线，紫外可见吸收光禚昨荧光光谱等方法研究了ＬＢ膜的结构，结果表明：ＬＢ膜分子排列是二维有序的超晶结构，Ｃｄ（ＨＱ）２分子的两个长链烷基生趣于亚相平面，两个亲水头基（８－羟喹啉）相对于法线以一定的角度倾斜：Ｃｄ（ＨＱ）２的单分子占有面积为０．７３ｎｍ＾３，单层高度２．５２ｎｍ，其ＬＢ膜的高荧     

Theoretical Calculation for the Oscillator Strength of A~3Π-X~3Π Band System of BN Molecule

选用ＳＴＯ４Ｇ双ζ扩展基组,采用单组态自洽场方法计算了分子轨道,然后再作较大规模的组态相互作用计算,得到ＢＮ分子基电子态和第一激发电子态的能量及波函数．两电子态的能量差与实验值相符甚好．在偶极近似下,计算了ＢＮ分子Ａ３ΠＸ３Π带系的振子强度,其值为０．０５６４．     

BN分子A^3П—X^3П带系振子强度的理论计算

选用ＳＴＯ－４Ｇ双ζ扩展基组，采用单组态自洽场方法计算了分子轨道，然后再作较大规模的组态相互作用计算，得到ＢＮ分子基电子态和第一激发电子态的能量及波函数。两电子态的能量差与实验值相符甚好。在偶极近似下，计算了ＢＮ分子Ａ＾３П－Ｘ＾３П带系的振子强度，其值为０．０５６４。     

有线电视前端常见干扰故障分析

有线电视前端由室内单元和室外单元组成，其中包括有源器件、无源器件、接收天线、设备以及连接电缆等。在安装、调试及日常维护过程中常见干扰故障大致有以下几种：１、邻频干扰２、同频干扰３、交调干扰４、互调干扰５、交流声调制干扰１、邻频干扰邻频干扰主要表现在图像上出现垂直、倾斜或水平网纹，有时也表现为类似交调“雨刷”干扰现象。其产生原因有ａ．频道之间隔离度不够，带外抑制达不到６０ｄｂ；ｂ．各频道之间输出电平不能保持相对平衡，超过３ｄｂ；ｃ．ｖ／Ａ值过小达不到国标规定的１５—２３ｄｂ的要求；ｄ．载波频率漂移…     

从中国大陆产银环蛇毒纯化的第三个K－神经毒素Ⅰ．毒素的纯化、鉴定与部分一级结构

从广东省花都市产银环蛇（Ｂｕｎｇａｒｕｓｍｕｌｔｉｃｉｎｔｕｓ）蛇毒纯化得到两个Ｋ－神经毒素（Ｋ－ＮＴ）：Ⅵ２ｄ峰及Ⅷ１ｂ峰。两者的分子量均为６５００，等电聚焦ＰＩ值均为９．１。Ⅵ２ｄ峰Ｎ端部分４３个氨基酸顺序与台湾姐环蛇的Ｋ－ＢＧＴ完全一致，后者是当前唯一可用于神经元烟碱乙酰胆碱受体分型的毒素探针。至此，从中国大陆产的银环蛇毒中找到Ｋ－ＮＴ家族中３个成员即：Ｋ－ＢＧＴ、Ｋ＿２－ＢＧＴ及Ｋ＿３－ＢＧＴ．     

多叶片离心通风机气动噪声特性及其控制

对风机气动噪声的产生机理及影响因素进行了系统的理论分析：（１）分析计算了风机噪声频谱中突出的峰包噪声的产生机理及频率分布特性；（２）对连续语随机嗓声的产生机理进行了理论分析和计算机模拟验证；（３）计算出风机旋转噪声与风机结构及叶道流型之间的关系，分析结果为该类型风机的噪声控制提供了可靠的理论依据和明确的降噪原则．通过大量实验及优化，研制出一套独特的整流丝网和导流吸声相结合的离心风机降噪措施，使风机噪声Ａ声级由７７．２ｄＢ（Ａ）下降到７１．２ｄＢ（Ａ），全压损失为７．３％，风机比Ａ声级由１６．８ｄＢ（Ａ）下降到１１．５ｄＢ（Ａ）．     

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