浅谈太原市呼延水厂二期工程电气设计

从供电电源选择、变配电系统设计、变配电站设置、照明设计、防雷设计、电缆敷设设计等方面介绍了太原市呼延水厂二期工程电气设计的主要内容。     

变配电站微机装置防雷接地方法与预防措施

雷击事件由于其极高的电压幅值和不可预测性更是微机系统的“天敌”,它极大的威胁着现代化变电所的运行安全。变配电站微机装置系统采取正确有效的防雷接地及预防措施就显得尤为重要。本文分析了变配电站微机系统遭受雷击的原因,总结了防雷接地的有效方法,提出了变配电站微机装置防雷的预防措施。     

变配电站温湿度监控系统的设计

随着国网公司建设智能电网的不断推进,大量无人值守的智能化高的变配电站需要各种具备通信功能的各种监控系统,当前对变配电站的温湿度监控还是较为空白,可能引起设备的过热和锈蚀。本文应用运行于40MHz晶振具有8051内核的μPSD3234A单片机利用IO口通信和AD转换读取DS18B20温度测量器件和HM1500湿度测量器件,并把测量结果通过单片机的RS232串口通信将数据送到计算机主站,并通过IO口经过达林顿管输出24V直流电压,直接或者再经过DC/AC继电器控制排风扇、除湿机、空调结点、告警信号等实现变配电站温湿度的自动测控。该系统的应用,有助于改善变配电站的运行环境,促进电网设备的稳定可靠运行。     

我国变配电站继电保护综述及案例特性分析

简要概述了变配电站继电保护作用,分析了我国继电技术的发展历程,结合第四代现代网络继电保护的技术特点,探讨了现代网络继电保护的应用.     

铁路电力自动化在铁路建设中的应用分析

铁路电力系统是由公共电网供电、铁路部门自行管理的电力网络,主要由铁路沿线变配电所（站）、贯通电力线路和自动闭塞电力线路、低压变配电系统及配套电力设施组成,担负着为铁路沿线运输生产和生活供电的任务。本文主要探讨铁路电力自动化在铁路建设中的应用。     

超小型PLC在小型自动化控制系统中的应用

介绍了小型变配电站电压无功调节自动控制系统的组成、控制方法与控制原理。该系统以超小型可编程逻辑控制器LOGO！230RCL为核心，可在负荷变化引起电压波动时自动控制电力变压器和无功功率补偿器的投入与切换，实现无功平衡和调节电压的目的。运行结果表明，自控系统控制可靠、运行稳定、操作方便。     

油浸式变压器的故障分析

油浸式变压器是发电厂、变配电站所的核心设备,它的运行状况直接关系到电力系统的供电质量.从油浸式变压器发出的异常声音、油位和油温的变化以及各种电路等方面分析了故障发生的原因,并给出了详细的解决方案,供相关工作人员参考.     

工厂10kV变配电所设计的常见问题及对策探究

在我国10 kV变配电所设计中,为了能够与快速发展现代化社会水平相适应,必须要提高10 kV变配电所的设计水平.我国工厂对10 kV配电所有着很高的要求,为了满足工厂生产需求,提高工厂生产效率,必须要提高10 kV变配电所的设计水平.在我国工厂10 kV变配电所设计中经常会出现一些问题,为了保证设计质量的过关,必须要全面分析工厂10 kV变配电所设计中常出现的问题,并找出相应的对策加以解决,以此保证10 kV变配电所的正常运行.     

关于变配电站监控系统的构成之我见

变配电站计算机监控技术是利用现代电子技术、通信技术、计算机及网络技术与电力设备相结合,将配电网在正常及事故情况下的监测、控制、计量和供电部门的工作管理有机地融合在一起。     

古县某煤矿瓦斯抽放站防雷设计

通过对临汾市古县某煤矿瓦斯抽放站实地工程勘察,依据相关规范和技术标准,并结合瓦斯抽放站工程主体布局及场所内设备配置,对瓦斯抽放站的泵房、变配电值班室、排放管、电源系统、信号系统等设施,提出了系统的防雷、防静电解决方案,对瓦斯抽放系统的安全运行起到了保障作用。     

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