可编程逻辑器件及硬件描述语言的EDA方法

介绍了用可编程逻辑器件CPLD及硬件描述语言VHDL设计数字系统的方法和采用CPLD器件进行电路设计的优点，着重介绍了在电子系统设计中，使用CPLD器件和传统集成电路设计的不同，采用CPLD设计是一种基于芯片的、“自顶向下”的设计方法，本文给出了一种键盘扫描的硬件及软件的设计实例。     

可编程图形硬件综述

集成可编程能力是图形硬件发展历程上的一次革命，它使得图形硬件能够适用于多种不同的应用。本文首先介绍了可编程图形硬件的发展，然后分析了它的流水线结构，最后介绍了几种最新的编程语言。     

基于PLD的数字系统设计中的一些问题及其解决

介绍了电子设计自动化以及硬件描述语言的发展现状，对目前最流行的三种硬件描述语言进行了比较．说明了基于可编程逻辑器件的数字系统设计和实现的基本思想和方法，并讨论了设计和实现过程中遇到的一些问题及其解决方法．     

PLC在称量系统中的应用

主要介绍了可编程控制器在称量控制系统中的应用,通过对系统硬件设计方法和程序设计思路的介绍,给出了人工称量进行改进的方法,对于提高称量的自动化程度和精确程度具有重要的参考价值。     

可编程器件的综合实验项目建设

根据大学本科教学计划和可编程器件实验教学要求,开展了基于可编程器件的综合实验项目的建设。由于可编程器件综合实验题目的设计代码最终要下载至可编程器件硬件验证实验装置来检验设计结果,实验效果直观,提高了学生实验的积极性。学生通过可编程器件综合实验教学能较好地掌握运用硬件描述语言实现既定电路或系统的设计方法。通过多年实验教学实践,在实验内容安排,实验教学方法上根据实验效果不断进行改进,取得了较好的实验教学效果。     

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。     

硬件进化技术在PLD器件设计中的应用

单个硬件可适合多种环境或任务是当今硬件技术的发展目标.在可编程逻辑器件中,采用了基于遗传算法的硬件进化设计方法.设计实例表明,此设计方法可使硬件结构自动进化,以适应环境的变化.     

基于遗传算法的可进化模拟滤波器的实现

以遗传算法和可编程模拟器件ispPAC80为评估手段和载体，实现了可进化的模拟滤波器的设计，将遗传算法和可编程模拟器件相结合，可在无须改动硬件的情况下。实现转折频率和阻带衰减等滤波参数的变换(即可进化性)，其性能达到甚至超过经典的同阶滤波器。     

基于可编程模拟器件的演化硬件的研究

研究了一种利用可编程模拟电子器件设计电路的方法。该模拟器件具有非常优越的可重构特性,通过编程控制可以方便地改变其结构,特别适用于模拟电路类型的演化硬件电路的设计。阐明了电路进化硬件的基本原理和实现技术,提出了一种基于可编程模拟器件的进化电路设计方法。     

GP在数字电路自动设计中的研究初步

提出一种新的基于GP和VHDL结构描述的数字电路自动设计方法,介绍了该方法的设计思想和设计流程。算法中染色体用树结构来表示数字电路的结构,同时建立VHDL的结构描述和树结构的对应关系,采用基于真值表的适应度评价方法,实现GP操作。GP操作独立于可编程器件,使得进化的速度大大提高。最终进化结果是一个具有良好易读性和可移植性的采用结构描述VHDL程序。用半加器的设计进行了实验验证,得到了符合要求的VHDL程序。     

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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