屏蔽门绝缘问题的成因及其对策研究

分析目前屏蔽门系统的绝缘设计及其在施工、运行中遇到的问题,阐述在施工、运营中影响屏蔽门绝缘值的因素。提出相应的处理建议和措施,包括确定合理的绝缘指标、处理好相关专业接口和施工工序、加强施工质量控制等。     

轨道交通站台屏蔽门系统及项目实施控制要点

本文对轨道交通屏蔽门的概念及功用、系统构成、项目实施过程及控制要点等进行了简单介绍,可供轨道交通站台屏蔽门设计、加工、安装、监理、运营等相关技术人员参考。     

地铁屏蔽门供电系统的保护措施及验收试验

在地铁屏蔽门的直流供电系统的基础上,提出TN-S接地方式,门体与钢轨保持等电、与站台结构绝缘等保护措施,提出供电系统的电磁兼容性能验收项目、参考标准、试验规格、试验部位、极限值,提出屏蔽门门体顶部及底部的绝缘电阻、绝缘强度,验收试验可供检测国产化地铁设备作参考。     

浅论屏蔽门绝缘及与钢轨等电位的安全措施

近些年,随着中国轨道交通工程项目的迅速增长,大量新技术、新工艺逐渐应用于轨道交通行业,随之产生了一些新型的安全问题。该文通过对我国轨道交通屏蔽门与钢轨之间等电位连接情况的分析,提出了采取新工艺和新技术的建议,不仅对提高城市轨道交通安全控制水平提供了一定的理论借鉴意义,还具有较强的可操作性。     

地铁屏蔽门样机的性能测试

根据相关的研究成果、工程经验、文献及标准,确定了地铁屏蔽门性能测试的样机模型组成、测试项目及测试标准．测试项目包括活动门运动性能测试、系统测试、寿命试验、电磁兼容性能和绝缘试验．其中活动门运动性能测试包括动能、运动速度曲线、关门力、手动开门力、关／开门时间几方面,系统测试包括模拟信号控制门动作、系统功能、障碍物检测及重开门几方面．该测试方法对国产化地铁车站屏蔽门的检验和测试,特别是设备的电磁兼容性能测试,有实用价值．     

基于CAN总线的地铁屏蔽门控制系统研究

CAN总线是一种安全、可靠的现场总线,在地铁屏蔽门控制系统中引入CAN总线技术可以实现数据信息共享以及控制信号的实时交换,这样不仅提高了信号的利用率,而且增强了系统的稳定性与及时性;介绍了地铁屏蔽门控制系统的功能和结构,对CAN总线的特点、结构及智能节点的组成进行了分析研究,构建了基于CAN总线的地铁屏蔽门控制系统。     

关于地铁屏蔽门样机性能试验的探讨

地铁屏蔽门样机试验对于屏蔽门的批量生产和后续运行起着关键的作用,本文着重对地铁屏蔽门性能试验进行了全面深入地探讨,提出了关于地铁屏蔽门样机性能试验的样机模型组成、试验项目、方法及目的。     

屏蔽门土建接口安装设计方案研究

通过对屏蔽门土建接口现行安装设计方案的介绍、分析和总结,提出了一种新的方案,即在现行设计的土建顶梁和站台板上,取消预埋件、预留孔的设置,改为由屏蔽门安装单位根据实际需要现场水钻施工,将孔洞的施工精度控制权掌握在自己手中。这样,既能解决土建施工超偏问题,又能大大降低土建的施工难度,同时还能解决因车辆或屏蔽门未招标而拖延土建施工问题。该方案既简单又适用。通过本篇,能让读者对屏蔽门的土建接口安装设计方案有一个更全面、更深入的理解和掌握,并最终为进行屏蔽门设计提供技术支持。     

地铁信号系统与屏蔽门系统控制接口浅析

以目前国内地铁对地铁屏蔽门实际功能的要求为基础,介绍了屏蔽门系统的原理及其功能要求,以及屏蔽门开门、关门的控制与监督过程,在此基础上重点分析了信号系统和屏蔽门系统的命令接口和状态接口的工作原理。     

视景仿真的屏蔽门系统在地铁列控系统中的应用

研究了一种基于视景仿真的虚拟测试方法,并将其应用于地铁列车CBTC系统的仿真测试平台中,利用Multigen Creator及Vega软件构建车站、站台屏蔽门及列车的虚拟现实环境,在实验室模拟了地铁站台屏蔽门的工作,解决了CBTC系统开发工作对现场环境依赖过高的问题.     

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.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

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.     

Design and analysis of generic LBS application developing platform

Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.     

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