基于FIFO共享RAM的数据采集系统

介绍了用于电力系统动态测辨设计的一种高速数据采集系统。该数据采集系统采用ＬＥＭ模型块作为电网的电流电压输入转换模块,ＬＥＭ模块是用磁补偿原理制作的霍耳器件新型的电流电压传感器,具有测量精度高、线性度好、动态性能及隔离好等优点。系统的智能采集卡自带ＣＰＵ和ＦＩＦＯ缓冲器,插于工控机ＩＳＡ扩展槽。智能数据采集卡通过ＦＩＦＯ存储与工控系统机共享数据,大大提高了数据采集速度和数据缓冲容量。在数据采集卡上设     

BQ－FMS单元控制器实时动画仿真

ＢＱ－ＦＭＳ柔性制造系统单元控制器负责管理柔性线各装置的总体配合，实现生产过程的自动化。而其中运控核心软件必须提供所有的控制管理与监视功能。ＢＱ－ＦＭＳ实时动画从属于运控系统，但又具有相对独立性。它的设计新颖，面对特殊的软、硬件环境，开发了辅助作图工具、布局软件，方便人机交互构作ＦＭＳ布局图，讨论了系统主菜单、运控核心、实时动画仿真各大模块之间的联系及信息传送。动态图形调度、切换准确及时，实现了运控核心软件主控程序的准确模拟调试及柔性系统运行状态的同步跟踪     

用光纤连接的双F—P干涉仪传感系统

研制了一个由双Ｆ－Ｐ腔及有关电子系统组成的远距离传感系统，系统中多模光纤将白光传送至远外的传感双Ｆ－Ｐ腔，并将传感Ｆ－Ｐ腔的透射光送回至参考Ｆ－Ｐ腔，该透射光由一可调参考Ｆ－Ｐ腔进行分析以确定两腔间距是否相等，一个相对简单的闭环控制电子系统用来使参考腔间距跟踪传感腔间距变化，因此，传感腔间距的测量能通过测量参考腔间距得到，而参考腔间中距则通过测量高压放大器输出电压而获得。     

级联光纤放大器多通道传输系统的性能

研究了光纤放大器噪声和光纤四波混频（ＦＷＭ）对级联光纤放大器多通道传输系统性能的影响。对传输速率为１Ｇｂ／ｓ和信道间隔为１０ＧＨｚ的２０路ＦＳＫ直接检测和外差检测的系统，当信号在常规光纤中传输１０００ｋｍ后，中间信道的最小功率代价分别为０．９和０．３８ｄＢ；对于色散位移光纤，最小功率代价分别为１．７５和０．７ｄＢ。     

光纤模数混合综合业务传输系统的研究

对光纤宽带综合业务传输系统进行研究，提出模数混合综合业务传输系统的结构设计以及特性指标，设计系统采用倍频式ＰＦＭ调制方式，具有较高的性能价格比。     

基于DSP的雷达信号处理系统设计

介绍ＦＭＣＷ油轮液面高度测量雷达数据处理系统的硬件设计和软件开发方法。该系统以３２位浮点ＤＳＰ为核心处理器，与数据采集系统的接口采用双口ＲＡＭ，与主机接口采用ＦＩＦＯ，从而保证雷达信息的实时处理。     

无感电阻电网络分流器性能实验

对新研制的无感电阻网络分流器进行了测量重复性,线性度试验和阶跃波响应试验,试验证明所研制的无感电阻网络分流器可用于kV级脉冲大电流的测量和雷电浪涌（冲击）模拟器短路电的波形校准。     

导体表面雷电流测量

为了对雷电流在导体表面的分布情况进行研究,研制了线圈式表面电流探头和巨磁阻表面电流测量系统,设计制作了低压脉冲源,在TEM传输室中对2种测量系统进行了实验和标定。采用这2种测量系统对矩形铝板表面电流密度进行了测量和仿真计算,实测和仿真计算结果一致。结果表明,巨磁阻表面电流测量系统可用于研究雷电流在导体表面的分布;采用合适频率的连续波,线圈式表面电流探头用于替代雷电流密度分布测量也是可行的。     

基于[CF+]的四阶电流模式低通滤波器分析

提出了以信号电流跟随器ＣＦ＋为基本电路元件,构成全集成ＭＯＳＦＥＴ－Ｃ精确连续时间四阶电流模式平衡结构低通滤波器电路,应用ＰＳＰＩＣＥ（Ⅱ）通用模拟电路程序,对其幅频特性和相频特性进行了计算机仿真分析。结果表明：这种滤波器能够直接处理电流信号,避免了电压跟随误差对电路质因数和自然频率的影响,有效地消除了ＭＯＳＦＥＴ电阻偶次非线性因素的影响,得到了可靠的计算数据。     

PVDF多点脉搏波计算机辅助测试系统研究

提出了一种新型压电薄膜（ＰＶＤＦ）多点脉搏波计算机辅助测试系统,它包括多点ＰＶＤＦ传感器、多点信号放大装置、以及数据采集系统。该系统可测量脉搏波在寸、关、尺三部的不同信息以及沿血管横截面方向脉搏波的变化,系统软件可全方位、多功能地显示各种脉图,实现多点动态实时测量,并能对脉图进行频谱分析和数字滤波。实验表明,本系统与中医脉诊相结合,将给中国传统医学的脉诊带来新的应用前景。     

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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