双色界面光孤子的特性研究

考虑双色光在带有周期性光格子的非线性波导界面处的传输特性,主要研究相位匹配条件及波导参数对表面光孤子的存在及稳定性的影响,并讨论如何通过波导参数调制对其进行全光控制.     

聚合物阵列波导光栅波分复用器的研究

利用甲基丙稀酸甲酯-甲基丙稀酸缩水甘油酯共聚物制作聚合物光波导，对聚合物阵列波导光栅波分复用器的原理、版图设计及制作工艺进行了研究。设计了聚合物阵列波导光栅的版图，并利用厚胶掩模和铝掩模两种工艺完成了聚合物阵列波导光栅光波导的制作。实验结果证明，与厚胶掩模相比，铝掩模具有较好工艺重复性，同时也更能实现设计所要求的参数。     

基于拉丝法的线结构光视觉测量系统标定

 利用线结构光视觉非接触测量技术的大量程、大视场、高精度、光纹信息提取简单等优点进行非接触测量大型机器及轨道等。分析了线结构光视觉测量传感器数学模型,利用构建的位于光平面上的标定特征点,提出了一种基于拉丝法的线结构光视觉测量标定方法,即先标定传感器相机的内外参数,再利用激光线与铁丝相交形成的点作为特征点标定光平面在相机坐标系下的方程。该方法降低了标定设备的成本,过程简单。标定结果表明：该方法标定满足测量要求。     

作波分复用最佳楔形平面阵列波导光栅传输模式特性的研究

采用楔霰平面阵列波导研究了其传输特性，建立了最佳数学模型，对于渐变波导光栅输入Bloch模转换成平面输入波讨论得到其AWG的传输效率及模式－幅值函数。楔形平面阵列波导能够作光局域网的星形耦合器和波分复用器。     

平面曝光型光造型装置的研究

微型光造型法的一个很大的缺点是构造物的制造时间长。为了解决这一问题，在报告微型光固化立体成型法现状的基础上，提出了一种新颖的平面曝光型光造型方案，设计并制作了实验装置，利用热敏色带制作微型平面掩膜，进行了平面固化成型实验，实验结果表明，利用平面曝光型光造型方案进行成型，单层硬化时间可缩短至１２０ｓ。     

基于模型匹配的结构光视觉焊接接头定位

提出一种基于模型的焊缝特征位置提取与识别方法.通过定义简单的参数化焊接接头模型,使用部分豪斯多夫距离(PHD)作为相似性度量准则,利用迭代匹配的方法使得焊接接头模型快速地逼近实际焊接接头的位姿.为了保证方法的可靠性与实时性,利用统计分析的方法设置相关的匹配参数,并通过将位姿参数空间定义在结构光平面而实现了参数空间的降维.实验结果表明,该方法在满足实时性的条件下保证了最后结果的精确性,满足实际应用的要求.     

光折变晶体中写入阵列平面波导实验

进行了在光折变晶体中写入阵列平面光波导的实验研究,分别给出了在LiNbO3∶Fe晶体和SBN∶Cr晶体中写入阵列平面光波导的实验结果.实验结果表明,用这种方法写入阵列平面光波导简便可行.     

基于变量变换级数展开法的光波导矢量本征模分析

基于变量变换级数展开法，获得了掩埋矩形光波导及脊形光波导的矢量本征模及其传播常数。变量变换使无限平面映射成单位平面，从而使单位平面边界上的电磁场自然为零，消除了非物理反射，提高了计算精度；另外，由于这种方法所导致的矩阵阶数小，因此计算效率较高。分析的结果与已发表的结果吻合较好，可以为优化波导光电子器件的结构提供参考。     

集总型电极光波导调制器的研究

光波导调制器是光纤通信系统中的重要器件，本文分析了Ｍ－Ｚ干涉型光波导调制器的工作原理，研究集总参数型电极的频宽特性，在ＬｉＮｂＯ３基片上用导波技术设计、制作了光波导调制器，并测量了主要性能。     

掺铒玻璃Ag+—Na+离子交换光波导的分析

将反WKB方法和余误差函数拟合法相结合，分析了Ag^ -Na^ 离子交换平面光波导的折射率分布，建立了光波导折射率分布与离子交换工艺参数之间的联系。得到扩散系数D与扩散温度T呈指数关系，衬底折射率改变量△n与Ag^ 的浓度呈线性关系的结果。     

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.     

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     

Journal of Donghua University ( English Edition) Contents of Volume 31

正~~