煤粉厂制粉系统防爆设计探讨

煤粉厂制粉系统的防爆是安全生产过程中的重要环节。本文分析探讨了制粉系统爆炸的主要因素,并提出了多种防爆方法和多项防爆设计,在工程设计的应用中取得了良好的效果。     

煤矿用柴油机车保护装置支架搬运车中的应用研究

目前,WC80EJ型支架搬运车是以防爆柴油机为动力的支架搬运车是用于综采工作面液压支架整体下井,整体搬家倒面作业的专用设备。因为现有情况下,国内现有很多的煤矿井下防爆柴油机车辆的自身安全保护系统方面或多或少地都会存在着很多的缺陷和不足,所以本文重点针对支架搬运车的柴油机安全保护系统所进行的整体设计进行了应用层面的分析。     

分布式光纤油气管道监测系统研究

提出一种基于混沌理论的监测分布式光纤管道泄漏监测系统的方法,采用Duffing相轨迹法和Lyapu-nov指数法检测微弱的正弦信号,建立了基于混沌理论的分布式光纤管道泄漏检测系统的数学模型,并且进行了实例验证。     

原煤储运系统筒仓的防燃防爆典型设计

筒仓作为原煤储运系统的必备设施,贮煤过程中易发生自燃甚至引起爆炸,本文介绍了几种典型的防燃防爆设计,对温度、可燃气体监测,情化保护系统,安全泄爆装置等设计进行了介绍和分析,并对它们的时间使用情况进行了讨论.     

束管远程监测在羊场湾煤矿的实现

主要讲述了束管远程监测在羊场湾煤矿的实现过程.通过分析羊场湾煤矿多业务远程监测系统的设计框架,具体描述了如何通过Delphi设计其子模块束管监测的基本业务.其中重点讲述了监测系统数据库如何采用DDE接口,与工控网络中的设备进行通信,以及束管监测的核心功能"三角防爆区分析"的实现过程.     

论矿井通风系统

矿井通风对矿井的安全至关重要,因此,采用计算机和网络技术开发了一套集中监测系统,以便更安全快捷地保证矿井安全生产。     

十六点可燃性气体状态监测系统中数据获取的研究

当工业控制中涉及到可燃性气体的检测和控制时，做了各项防爆措施之后，如何准确地获取可燃性气体的浓度值，是整个系统成败的关键。文中从硬件和软件两个角度介绍了笔者开发的十六点可燃性气体状态监测系统中数据获取的方法。     

浅谈桥梁结构的安全监测技术

桥梁结构的安全监测是保证桥梁安全运营的重要手段,经过几十年历程,桥梁结构的安全监测得到较大发展,各种方法也日趋成熟。综合大量相关文献,较系统全面地介绍了目前国内外采用的结构安全监测的先进技术和方法,以供同行参考。     

隔爆和本安系统防爆原理和选用原则

本文介绍了自动化仪表系统在爆炸危险场所安全应用的防爆技术,并重点讲述了自动化仪表产品最为常用的隔爆型和本质安全型防爆技术的特点,最后阐述了冶金行业设计中对于这两者的选用原则。     

微弱瓦斯信号检测的原理和方法

瓦斯是发生在煤矿中重大自然灾害的根源之一,瓦斯爆炸严重威胁到煤矿作业人员的生命安全,影响煤矿的正常生产。实时准确地监测煤矿瓦斯气体浓度对保障安全生产具有十分重要的意义。本文采用相敏检波原理与DSP实现数字低通滤波相结合的方法来检测微弱的瓦斯浓度信号。     

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