电网调度自动化系统的规划设计

调度自动化系统是企业管理网的基础,建立供电企业计算机管理网络已是大势所趋.本文以广元电业局调度自动化系统为例,全面分析了调度自动化系统在企业计算机管理网中的地位和作用,论述了电网调度自动化系统规划设计原则以及应该注意的问题.     

基于软交换的企业网语音通信系统的实现

分析了企业网语音通信的需求以及相关软交换产品研究的现状，提出了一种企业网语音通信的软交换解决方案，并在此基础上开发和实现了一个便于在企业网灵活部署的纯软件的电话会议系统VCSBSI。     

面向制造企业的智能企业诊断系统

概述了企业诊断系统的研究现状,分析了其与企业信息系统研究相孤立所带来的问题.为适应现代制造企业管理的需求,提出基于数据仓库的智能企业诊断系统.智能企业诊断系统由查询与跟踪、问题识别和指标评价、模糊Petri网推理、诊断过程概要解释、问题解决支持、人机界面等6个主要模块构成.为了更好地处理企业诊断知识的模糊性、整体性和复杂性,通过扩展模糊Petri网系统实现企业诊断的知识建模和推理.功能模型描述了系统各模块的主要功能及其与数据仓库系统间的集成方式.此外,讨论了模糊Petri网诊断推理、与数据仓库系统的集成、知识提取和数据挖掘等系统实现的关键技术和方法.通过智能企业诊断系统、数据仓库系统和OLAP三者的有机集成,提供一个有效的企业诊断集成环境,使管理者能够更好地解决经营管理中存在的问题,充分发挥制造企业潜力,使企业健康发展.     

基于企业网的数控技术研究

在制造技术智能化、网络化日益发展的基础上，章构建了基于企业网的数控系统的整体结构．分析了系统的功能及特点，并就系统的关键技术进行了开发研究，最后给出了企业网环境下的一个应用实例。     

企业网络信息安全设计

本文主要介绍企业内部网络的信息安全,内外网络互访时企业网络对信息安全的需求,以及如何构架企业网信息安全系统三个问题。介绍了在企业网信息安全体系中所需采用的安全技术,使我们的企业网络通过这些技术能够更加安全可靠稳定的运行。     

供需网的IDEF0模型构建及MIFPN模型转换

将IDEF0模型与Petri网相结合,对多信息流系统进行功能描述和动态行为关系分析,提出了多信息流Petri网(MIFPN)的定义,给出了IDEF0至MIFPN转换的规则方法.在此基础上实现对多功能开放型企业供需网系统的功能分析与设计.     

220 kV总降压站自动化控制的设计与实现

双机双网综合自动化系统的优越性正受到企业电网管理者的青睐.以株冶总降压站的双机双网综合自动化改造为基础,介绍了综合自动化的系统组成、系统特点,同时简述了故障录波对电网故障辅助分析的重要性.     

集中热源分散供热实现定压供暖的改进办法

<正>对于集中热源分区供暖的水—水供热系统,由于特有属性,即供热是由一次热源网,二次供热网,有些供热企业还有蒸汽网三级换热系统组成,大多供热企业多采取一次网半开式运行与蒸汽网开式运行模式。而对采取一次网闭式运行方式则存在以下好处,既可有效保障一次水网介质的损失控制在最低水平,一次网的压力稳定值可有效保证,一次网水质可有效保证。     

有线电视设备制造企业的ERP系统设计

企业资源计划是运用计算机技术实现企业信息化的主要途径之一．采用软件工程的方法．设计了有线电视设备制造企业的ERP系统,给出了系统总体业务流程图,对ERP系统的各管理系统的功能进行了分析,该系统将ERP系统的企业管理思想和信息化优势应用于CATV有线电视光纤一同轴混合网（Hybrid of Fiber and Coax,HFC）传输设备生产开发行业,符合行业的特点,能满足企业实际需要。     

基于Petri网的工作流建模的研究

工作流技术作为实现企业过程的有效手段,广泛应用于各种场合.在应用中,关键是建立适合企业过程的工作流模型.Petri网是一种适合于描述异步并发现象的系统模型,它既有严格的数学定义,又有直观的图形表示.本文主要介绍了Petri网和工作流模型的理论,以及基于Petri网的工作流建模方法,并给出了设计实例.     

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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