浅谈无功补偿及消谐装置在工厂供电系统中的应用

工厂非线性负载的大规模使用会产生大量的无功容量和高次谐波,绝大部分无功分量和谐波电流会返回作用在工厂供配电系统中,不仅消耗大量的电能,同时降低了工厂供配电系统的功率因数,导致电压和电流发生畸变,严重影响了工厂供电的可靠性,导致产品生产效率和质量下降,给工厂带来巨大的经济损失。因此,必须设法提高工厂供配电系统的功率因素,提高电能质量,保证供电可靠性。本文在分析了低功率因素和谐波对工厂供配电系统的危害后,结合自己的一些工作经验,总结和分析功功率补偿及谐波抑制措施,实现工厂供配电系统的高效节能运行,提高工厂的综合生产效率和经济性。     

浅谈华北油田创业家园住宅小区供配电系统设计

本文以华北油田创业家园小区供配电系统设计方案为例,提出了大型高层住宅小区供配电系统接线的设计方案,该方案采用两条6（10）kV线路同时运行、互为备用的主接线形式,其供电容量大、运行安全、可靠性高,满足一、二级负荷对供配电系统主接线方案的要求。     

工业区供配电系统设计实例分析

工业区供配电系统就是将电力系统的电能分配到各工厂或车间中去,是整个工业区设计中的重要组成部分。工业区供配电设计应该要做到保障人身和设备的安全,供电可靠,还应根据工作特点、规模和发展规划,适当考虑扩建的可能性,从全局出发、统筹兼顾,完善和细化各供电区域内的供配电系统设计的目的。     

浅谈某工厂生产线供配电系统

介绍某钢工厂1780mm热轧生产线采用的35kV／10kV供配电系统。其特点为35kV系统采用单母线分段接线，所有轧机主传动由35kV电压直接供电，各区域变电所由35kV电源线路和变压器组成“线路-变压器组单元”接线方式供电。35／105kV变压器的差动保护选用SEL-587智能型电流差动保护继电器。10kV供配电系统选用SEL～351型智能保护继电器作过电流保护。     

浅论工厂供配电系统中节电的意义及措施

本文以工厂供配电系统为研究对象,从工厂供配电系统的节电意义分析入手,提出了包括管理措施以及技术措施在内的工厂供配电系统节电措施,并据此论证了做好这一工作在实现整个市场经济生态效益与经济效益均衡发展的过程中所起到的至关重要的作用与意义。     

提高供配电系统可靠性的技术措施

提高供配电系统的供电可靠性是供电企业的核心工作任务,尤其是在社会对电力的需求日益扩大的今天,提高供配电系统可靠性显得尤为重要。本文指出了影响供配电系统供电可靠性的因素,论述了提高供配电系统供电可靠性的若干技术措施,取得了令人满意的效果,以期指导实践。     

关于住宅小区供电方案的探讨

配电系统是小区的重要组成部分，供电方案设计质量直接影响小区可靠用电、节能运行。优化的供电方案为配电系统的可靠性、安全性和照明的舒适性提供了行之有效的保障。本文结合多年的实际经验，对小区供电方案的优化设计进行了探讨。     

工厂用电照明的合理化设计

本次设计主要为工厂供配电及照明线路设计。阐述了供配电系统及其组成、负荷等级,还有在进行供配电设计时有哪些要求,从电网为工厂引入动力电源后怎么选取变压器及接线方式。在工厂内部如何进行线路敷设以及照明系统的安装。在达到以上设计要求的同时还要注重安全、环保、经济、节能,使效益达到最大化。     

住宅小区配电室设置与自动化技术研究

当前多功能综合型的大型小区的出现为电力企业的供配电提出了更高的要求。基于此,首先介绍了某住宅小区的现状,介绍了社区对小区供配电的要求,阐述了测算小区供电负荷和配置配电变压器的方法,对住宅小区配电系统常规方案和配电自动化系统技术进行研究,进而深入研究了配电室的相关设计。     

助航灯光低压供配电系统自投自复故障分析与处理

助航灯光系统为航空器起飞、着陆、滑行提供目视助航引导。助航灯光系统供电是否稳定可靠将直接关系到航空安全。本文以重庆机场灯光站低压供配电系统自投自复运行方式为例,结合实际工作中遇到的自投自复故障案例,通过分析低压供配电系统自投自复功能原理,提出相应故障解决方案,确保机场助航灯光系统供电持续、可靠。     

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