PLC在大楼蓄能系统中的应用

介绍了一种将集散控制系统与可编程控制器(PLC)融合为一体的自动化系统,该系统将过程自动化与信息管理自动化相结合构成新型综合集散控制系统--大楼蓄能自动控制系统,重点分析了模块化编程在PLC编程中的应用,给出了实现系统自诊断的方法和技巧.     

火电厂电气自动化系统建设研究

在火电厂生产中,电气自动化系统,是火电厂电气系统的保护、控制、故障信息管理、运行、故障诊断等先进自动化功能的综合自动化监控管理系统。该项系统能够充分利用火电厂电气系统联网后信息全面的优势,集中加强电气系统信息的应用,完成复杂的电气运行管理工作。以此实现与发电厂MIS系统和SIS系统的无缝连接。本文对火电厂电气自动化系统的建设进行了相关探讨。     

多台浆纱机实时数据库管理系统

本文报道的是一种在微机网络环境下,对多台浆纱机生产过程的实时数据库管理系统。该系统将实时采样信息与静态输入信息合二为一,生产管理人员可在控制台随时对该综合数据库进行各种可能的操作。由此将企业浆纱工艺生产管理自动化水平向前推进了一大步。在该系统中,网络工作站负责前台采样及动态信息显示,网络服务器进行数据集成管理与人机对话。对多信息,多机台实时采样而产生的动态数据库和与之相关的静态数据库在网络环境下实现同步与统一,该系统不失为一种有益的尝试。     

氧化铝生产过程的MES体系结构

制造执行系统(MES)是连接上层企业资源计划(ERP)与底层过程控制系统(PCS)的桥梁,是基于ERP,MES,PCS3层结构的流程工业综合自动化系统的关键.针对氧化铝生产过程的特点,分析和探讨了氧化铝生产过程MES体系结构和功能,提出了氧化铝生产过程MES的功能模块设计.实践结果表明:氧化铝MES的实施实现了氧化铝生产过程下层过程控制的实时信息和上层企业资源计划的信息融合与贯通,实现了氧化铝生产过程的优化控制、优化运行和优化管理,提高了企业的综合竞争力.     

变电站综合自动化系统的研究

近年来,在电网运行水平提高时,大量采用远方集中监视、控制等变电站综合自动化系统,既提高了劳动生产率,又减少了人为误操作的可能。采用变电站综合自动化技术是计算机和通信技术应用的方向,也是对整个电网的一、二次设备信息进行综合利用,发展和完善变电站综合自动化系统,是电力系统发展的新趋势,本文就变电站综合自动化系统进行一些探讨。     

电网综合自动化系统刍议

随着电力系统自动化的发展,微机继电保护装置的广泛应用和变电站综合自动化水平的不断提高,各种智能设备采集的模拟量、开关量、一次设备状态量大大增加,运行员可以从中获取更多的一、二次设备的实时信息。本文针对电网继电保护综合自动化系统及其系统构成和功能分析作出了具体综述。     

QuickBird遥感影像的融合方法比较研究

应用IHS变换、Brovey变换、主成分变换3种影像融合方法对QuickBird多光谱和全色遥感影像触合实验研究,并通过空间细节信息和光谱信息二类统计参数对触合结果进行评价和分析,综合评价结果表明:三种算法中IHS变换更适于QuickBird遥感影像的融合。     

变电站综合自动化通信网络几种方式的研究

论述了目前国内变电站综合自动化系统所采用的几种网络技术 ,通过分析比较 ,指出新型现场总线 CANBUS是变电站综合自动化系统通信网络性价比最好的一种网络     

专家决策系统在煤矿综合自动化系统中的应用

综述了我国煤矿自动化及专家决策系统的现状及发展趋势,展望了专家决策系统在煤矿综合自动化的生产过程控制、生产系统安全性能评价及故障预测诊断环节中的控制应用,分析了专家决策系统在煤矿综合自动化系统中存在的主要问题,并针对存在的问题提出了发展方向。     

电网继电保护综合自动化系统的研究

本文提出了电网继电保护综合自动化系统的概念,就是综合利用整个电网智能设备所采集的信息,自动对信息进行计算分析,并调整继电保护的工作状态,以确保电网运行安全可靠的自动化系统,同时阐述了该自动化系统结构功能及其实现方法。     

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     

An affordable accurate evaluation of the binding conformations predicted by molecular docking studies in bio-system

Franck-Condon factors bridge the gap between theoretical modeling and experimental observations for molecular electronic spectroscopy and electron transfer.Under the displaced harmonic oscillator approximation,multidimensional Franck-Condon factors are decomposed into a product of many one-dimensional(1D)Franck-Condon(FC)factors,and each 1D-FC factor is associated with one Huang-Rhys factor that determines the leading contribution of     

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