基于大规模PLD器件的接口电路设计

为了提高微机系统的集成度并实现微机系统的功能重构 ,利用大规模可编程逻辑器件集成度高及用户可编程等特点 ,借助EDA工具 ,设计了基于大规模可编程逻辑器件的微机系统接口电路。设计实例表明 ,不仅可将多个接口电路的功能集成在同一块芯片上 ,而且可重构接口电路的功能。     

基于EDA技术的抢答器的设计与实现

从实际应用出发,利用电子设计自动化(EDA)技术,用可编程逻辑器件设计具有扩充功能的抢答器.该抢答器利用Protel99完成了原理图设计、利用VHDL完成了控制主电路设计,具有数字显示电路、倒计时显示电路、违犯规定电路、编码译码电路功能,并利用的MAX-PLUSⅡ工具软件完成了编译仿真验证;硬件选择Altera的MAX740005系列的EPM7128LC84-15芯片来实现抢答器的系统功能,该抢答器具有很强的功能扩充性,应用效果良好.     

基于VHDL的数字频率计的设计

在电子设计领域．随着计算机技术、大规模集成电路技术、EDA技术的发展和可编程逻辑器件的广泛应用,传统的自下而上的数字电路设计方法、工具、器件已远远落后于当今技术的发展。基于EDA技术和硬件描述语言的自上而下的设计技术正在承担起越来越多的数字系统设计任务。本文的数字频率计设计．采用自上向下的设计方法,实现整个电路的测试信号控制、数据运算处理和控制数码管的显示输出。一块复杂可编程逻辑器件CPLD芯片EPM7128SLC84—15完成各种时序逻辑控制、计数功能。在MAX＋PLUSii平台上．用VHDL语言编程完成了CPLD的软件设计、编译、调试、仿真。CPLD芯片的现场可编程性,不但大大缩短了开发研制周期．而且使本系统具有结构紧凑、体积小．可靠性高．测频范围宽、精度高等优点。本文详细论述了系统自上而下的设计方法及CPLD的软件编程设计。     

数字逻辑电路在EDA实验开发系统中的仿真设计

数字逻辑电路是重要的硬件基础课程,也是一门与应用密切相关的课程,其应用理论与方法随数字电路器件的发展而不断变革,EDA实验系统是为在系统可编程器件提供一个实验平台。课题研究的内容是基于EDA（电子设计自动化）实验系统,以VHDL为硬件描述语言,以Max＋Plus Ⅱ为软件开发工具,设计了数字逻辑电路的实验程序,为数字电路初学者的逻辑设计抛砖引玉。     

EDA技术在数字电路实践教学中的应用

EDA(Electronic Design Automation)是以计算机为平台,原理图输入法、硬件描述语言(VHDL)为设计语言,可编程逻辑器件为实验载体,以ASIC/SOC芯片为目标器件进行必要的元件建模和系统仿真的电子产品自动化的设计过程,将传统的数字电路基础理论教学与现代EDA课程在教学内容和实践内容协调发展,EDA实践教学采用开放式实验教学模式,通过开设数字电路EDA实践教学工作,使学生从传统的数字电路设计方法过渡到现代先进的设计方法,在长期的教学实践中,数字电路课程自成体系,取得了良好的教学效果。EDA实践教学在顶层进行原理图的设计、仿真、纠错,也可用硬件描述语言对复杂系统进行描述,然后生成具体门级电路,学生可不受芯片的约束,进行数字电路相关实践内容。     

基于ISP技术的接口实验设备的设计与开发

采用EDA技术设计实验所需芯片，并将其熔丝文件下载至系统可编程器件中，取代传统的实验器材，大大简化了实验步骤与成本，增加了实验的直观感，有利于提高实验教学效果。     

数字逻辑技术

随着半导体技术的发展,数字逻辑电路经历了从分立元件、SSI、MSI向LSI,VLSI的演变过程．上述电路被通称为标准逻辑电路。二十世纪末标准逻辑电路开始向专用集成电路发展,推动这场历史性变革主要是可编程逻辑器件（PLD）、现场可编程门阵列（FPGA）技术的兴起,由此可编程集成电路以及与之相应的EDA技术应运而生,电子系统设计进入了一个全新的阶段。本文介绍了数字逻辑电路的发展过程,着重阐述了可编程逻辑器件、HDL语言设计方法、EDA工具设计流程及可编程片上系统技术。     

基于CPLD的数字系统设计

以数字钟的设计过程为例，介绍复杂可编程逻辑器件(CPLD)在数字系统设计中的应用，说明了CPLD、硬件描述语言和EDA开发软件的重要作用，给出了主要电路模块的VHDL设计和操作方法。     

基于在系统可编程逻辑器件的循环码的编、解码系统设计

介绍了利用Ｌａｔｔｉｃｅ 公司的在系统可编程逻辑器件ｉｓｐＬＳＩ１０１６ 设计的循环码编、解码系统,并给出了该系统的顶层电路和用ＡＢＥＬ语言设计的功能模块．该系统可用于数据通信实验和串行通信系统中．     

MIDI音乐发生器芯片的设计

基于EDA技术,以MaxplusⅡ为软件开发工具,采用VHDL语言,在Altera公司的大规模可编程逻辑器件(CPLD)上实现了MIDI音乐发生器芯片的设计.该芯片配上必要的外围电路,可以发出美妙的MIDI音乐.     

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