某大气数据计算机自动测试系统的设计

自动测试、通用化是航空测试仪器研制的发展趋势，采用模拟化，数字化，自动测试技术，针对大气数据计算机自动测试系统信号给定电路，信号测试电路，接口电路以及测试系统自检等电路进行了设计，从工程实践出发，成功的解决了自动检测和抗干扰问题，该自动测试系统在航修厂得到了推广使用。     

搅拌设备控制系统的输入信号预处理电路设计

为了提高沥青混凝土搅拌设备计算机控制系统的可靠性，针对其工作环境对输入信号预处理电路的特殊要求，通过比较的方法，论述了温度检测和配料称量等模拟信号及开关量输入信号处理电路设计的依据，并设计了相应的电路。针对变频器输出频率显示信号中的高频噪声，设计了相应的噪声消除电路，给出了进一步提高系统抗干扰能力的措施。将设计的电路应用于LB2000和LB3000型沥青混凝土搅拌设备计算机控制系统，进行了测试。测试结果表明：输出信号稳定，且消除了高频干扰，提高了系统的可靠性和抗干扰能力。     

基于嵌ARM的电路自动测试系统的设计

本文介绍了一种基于嵌入式的电路测试系统的设计。区别于传统的基于通用工控机的电路测试系统,本文充分利用ARM、FPGA、DDS等先进技术的体积小功耗小的特点把传统的测试系统做进一步的改进设计,使得测试系统便于携带,性能更加优良。     

基于数值压电电路传感器的参数可变的冲击波存储测试系统设计

针对现有冲击波超压存储测试系统带宽不足的现状,分析了压阻式与压电式传感器的优缺点。采用两级放大电路设计了基于数值压电电路(ICP)传感器的参数可变的冲击波存储测试系统。主要设计了ICP传感器的电源电路参数可变电路及滤波电路,可根据不同的测试要求设置参数,提高了系统的灵活性。采用FPGA进行数字逻辑控制设计,提高了测试系统的稳定性和可靠性并减小了系统体积。最后在自然环境和现场环境下分别进行了试验,结果验证了其可靠性、生存性、灵     

光电可逆计数器系统的设计

通过对光电可逆计数器系统的研究，分析设计了以CMOS集成电路为基本组成部分，配合光电探测电路，电压放大电路波形整形电路，从而对光信号干涉条纹进行计数，达到高精度测试目的。     

SRAM的一种可测性设计

用ETCO算法对SRAM进行了内建自测试设计．首先说明了设计的原理，进而对电路中所用的各个单元电路进行了设计，主要包括地址计数器、数据计数器和BIST控制器等．设计出的电路可针对具体的故障模型设置相应的测试长度，从而获得预期的故障覆盖率．测试时不需存储正确响应，并可通过一个响应标志位表示检测的结果．可测性部分对电路硬件的开销较小，所设计的电路在工作站上已成功通过仿真，此电路可广泛应用于嵌入式SRAM，以降低电路的测试难度．     

整流桥自动测试分选机的研制

论述了微型计算机在整流桥测试分选机中的应用，并分别介绍了极性测试电路、ＶＦ测试电路、ＩＲ测试电路的测试原理。还介绍了微机控制系统的硬件和软件。该机采用自动分时测量，对各项指标综合评定输出分选结果，广泛适用于半导体行业     

航空测试仪器中的PCI04 总线技术

小型化与便携是航空测试仪器设计所追求的目标。针对PC104 总线系统具有体积小、结构紧凑等特点，在设计航空设备内场检查仪的测试电路时，采用了PC104 总线技术的原理和方法，并从工程实践出发，成功地解决了总线冲突与抗干扰问题。设计的结果表明，该检查仪具有体积小、重量轻、测试准确等特点。     

基于I2C总线大屏幕彩电示教系统设计

为满足现代电子信息教学及培训需求，本文给出了一种大屏幕彩电示教系统的设计方法，该设计以市场上常用的大屏幕彩电典型电路为基础，通过设计将其扩展成大型示教板，并配合显示器，使学员既可以直观的看到电视机内部电路，又可以通过测试点测试电路的电参数，在设计中制造性地应用了单片机对故障点进行自动设置，通过汉显液晶来显示故障点和提示信息。     

高精度陀螺仪力矩器施矩电路的设计

介绍了陀螺仪力矩器施矩电流的产生原理以及数字——施矩电流转换电路的二元调宽实现，详细阐述了二元调宽脉冲施矩软件和硬件电路的设计方法．经过实验测试和工程实践，该电路工作稳定，达到了系统精度要求．     

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     

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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Brief Introduction to “Journal of Jilin University( Science Edition) ”

<正>"Journal of Jilin University(Science Edition)"is a comprehensive academic journal in the fields of science sponsored by Jilin University and administrated by the Ministry of Education of the Peoples Republic of China.The journal started publication in 1955.The original name at starting publication was"Journal of Natural Science of Northeast People University",which was changed into"Acta Scientiarum Naturalium Universitatis Jilinensis"in 1958 owing to the name change of the university.The present journal name has