相移扫描莫尔的付里叶描述

用频谱分析的观点对相移扫描莫尔的进行了分析,提出了该方法的付里叶描述。对变形条纹的间隔抽样能分离出莫尔条纹,但这样所得的莫尔条纹精度不高,通过多帧相移叠加能提高精度。揭示了该方法获得清晰光滑的莫尔条纹的频域实质。     

虚拟光弹性力学实验研究

为了实现虚拟光弹性力学实验,提出并采用了一种基于有限元计算和理论分析确定虚拟应力条纹图的反演方法,对巴西圆盘径向压缩实验的光弹性实验结果进行了模拟,并将反演获得的应力条纹图同真实实验获得的条纹图进行了对比分析。结果表明,反演获得的应力条纹图同实验结果一致,该方法实现了在虚拟光弹性力学实验中的定量分析。该方法对虚拟光弹性力学实验研究具有可参考价值。     

爆破模型动光弹和全息干涉研究中的两个基本问题

在一次爆破加载中同时获得了等差条纹图和等和条纹图，利用２种方法进行无限平面集中爆破载荷的动应力场求解研究，对不同方法的计算结果进行了对比分析并指出了各自的适用范围。为解决复杂条纹图的判读问题，还设计了一种应力波边界反射后条纹判据的检验方法。     

凸条纹毛衫的编织方法及面料特点

研究形成凸条纹毛衫面料的各种编织方法并分析各种编织方法形成的凸条纹毛衫面料特点.通过对毛衫面料小样的分析,得出形成凸横条纹面料、凸竖条纹、凸波折条纹的编织方法及各种方法形成的面料特点,并且根据凸条纹面料的立体效果的强弱对各种编织方法进行排列.     

面向光学三维测量的非均匀条纹生成方法

针对投影条纹间距比较小和被测表面法向处于变化范围较大的状态时局部条纹形变严重、分布密集,甚至出现条纹间重叠干涉现象,导致相位求解、条纹中心提取等方法失效的问题,提出了一种非均匀投影条纹生成算法。先利用投影均匀条纹到被测物体上,对相机采集图像中局部条纹分布密集的区域进行相位梯度调整,再运用反向条纹投影原理计算出非均匀投影条纹。对投影均匀条纹和非均匀条纹到被测物体表面进行光学三维测量,仿真和实验结果表明:当测量精度均达到50μm时,投影均匀条纹测量时有7.2%的数据点丢失,投影非均匀条纹时仅有0.24%的数据点丢失,基本上解决了局部条纹变形严重、分布密集导致点云丢失的问题,从而保证测量数据的可靠性。     

激光等离子体干涉条纹的图像处理方法研究

为了研究激光等离子体内部电子密度的分布,采用计算机图像处理方法对激光等离子体干涉条纹进行处理。利用Mach-Zehnder干涉仪采集激光等离子体干涉图。对得到的激光等离子体干涉条纹进行滤波和锐化预处理,然后利用二值化和细化等方法对降噪后的激光等离子体干涉图进行处理,得到等离子体干涉条纹的细化图。最后对细化后的干涉条纹偏移量进行Abel逆变换,得到激光等离子体电子密度径向分布。     

小口径光束准直性的实时检测

对普通平行平板剪切干涉在结构上进行了改进, 将傅立叶光学空间频率合成原理应用于横向剪切干涉对光束的准直性进行检测. 普通剪切干涉方法通常是根据干涉条纹密度判断光束, 本文通过条纹倾斜状况判断光束; 实验数据处理应用计算机对采集到的图像进行Radon变换, 提高了对条纹倾斜的判断精度, 从而提高了判别光束口径的范围和精度.     

对光纤Mach-Zehnder干涉仪的干涉场研究

研究了光纤Mach-Zehnder干涉仪的干涉场的特性,并对影响干涉效果的因素进行了分析,得到了干涉条纹的分布及获得高对比度干涉条纹的方法.     

Fourier方法分析Moire条纹

该文用Fourier光学方法分析了分离一定距离的2个Ronchi光栅产生的Moire条纹。在第二块光栅后面直接观察,所得Moire条纹实质上为多光束干涉条纹。在第二块光栅后面加上滤波系统,适当滤波后,Moire条纹成为三光束干涉条纹或双光束干涉条纹。文中对滤波后的Moire条件进行了理论分析,给出了零号频谱滤波和Ⅰ号频谱滤频波下Moire条纹的方程和对比度,得到条纹的方程和对比度与两光栅间距的关系,并给出了与理论相一致的实验结果。     

PCB干涉条纹图像处理的研究

对某一航空PCB电路板的激光全息干涉条纹的处理 ,采用Delphi、VC、Matlab对干涉条纹进行数字化处理 ,主要采用的是条纹中心技术 ,为光学干涉技术的条纹处理提供可靠的方法 ,同时可以获取可靠的光学实验数据     

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

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