瓦斯突出的动力现象与防治措施

瓦斯突出是影响煤矿安全生产的一种灾害性事件，它具有偶发性和突发性，在生产中对它的活动规律进行研究和有效地观测和防治，是预防和减少这种灾害，保证安全生产的一个必要环节。作者对平顶山十矿丁－21130采煤工作面观测数据进行了统计分析，得出了可供参考的矿山压力与瓦斯突出的关系，并提出了几种防治措施。     

阳泉矿区煤与瓦斯突出预测实践与探讨

煤矿瓦斯事故严重威胁职工生命和财产安全,是影响煤矿安全生产的最大灾害,煤与瓦斯突出又是防治瓦斯事故中的难点和重点。本文通过对煤与瓦斯突出机理和规律的分析总结,并结合阳泉矿区在防治煤与瓦斯突出工作中的探索实践,重点论述了煤与瓦斯突出预测的方法和技术标准,为煤矿生产实践中的瓦斯防治提供了可行的方法和预测的量化标准,并为保证矿井安全生产提供了一定的技术指导。     

浅谈煤与瓦斯突出的防治

煤与瓦斯突出是地应力和瓦斯压力的共同作用下的一种异常的动力现象,是制约煤矿安全生产的五大自然灾害之一。防治煤与瓦斯突出的措施主要采用突出危险性预测、防治突出措施、防空措施效果检验和突出防护措施在内的＂四位一体＂的综合防突措施。通过瓦斯抽（排）放钻孔释放采掘工作面及附近区域的部分瓦斯,降低采掘工作面的瓦斯压力,达到安全生产的目的。     

煤巷掘进中煤与瓦斯突出的机理探析

煤与瓦斯突出是煤矿井下生产中的一种自然灾害,它严重威胁着煤矿的安全生产。本文分析了我国煤与瓦斯突出的特点和煤与瓦斯突出的影响因素,并探讨了煤巷掘进中煤与瓦斯突出的机理。     

瓦斯突出煤体的导电性质研究

瓦斯突出煤体是在瓦斯突出灾害发生前就已经客观存在的地质体,是发生瓦斯突出的必要的物质条件．针对瓦斯突出煤体煤样的特点,采用具有国际先进水平的数字式双频激电仪作为主要观测仪表,建立了集先进性和实用性为一体的瓦斯突出煤体电性参数观测系统．通过进行实验室大量煤样的测定,研究了瓦斯突出煤体的导电性质．为利用以电磁法为主的地球物理方法进行瓦斯突出煤体探测和瓦斯突出预测提供了物理基础．对减轻和防止煤矿瓦斯突出自然灾害具有重要意义     

煤矿瓦斯压力传感器的应用与硬件技术浅析

煤层的瓦斯压力是矿井瓦斯基本参数之一,它对于确定煤层瓦斯含量和瓦斯动态变化,进行矿井瓦斯突出治理,瓦斯抽放以及煤与瓦斯突出的防治等工作均具有十分重要的意义。     

芦岭煤矿煤与瓦斯突出的地质因素分析及防治对策

煤与瓦斯突出是煤矿生产过程中的一种复杂动力灾害现象,其产生的机理复杂,突出要素之间相互关联,具有突发性特征,其中以煤矿瓦斯地质特征对煤与瓦斯突出的影响最关键.通过对煤矿现场资料收集总结与分析,研究了芦岭煤矿瓦斯地质特征及与煤与瓦斯突出的关系,表明矿井瓦斯地质特征、印瓦斯的赋存受地质条件控制,地质构造和构造煤是引发煤与瓦斯突出的主要因素,并在此基础上提出了防治煤与瓦斯突出的相关对策.     

煤的微观结构对瓦斯放散特性的影响研究

近几年来,我国煤矿的安全生产形势依然严峻,其中煤与瓦斯突出是煤矿井下生产中的一种强大的自然灾害,它严重威胁着煤矿的安全生产,而且随着煤矿开采深度和强度的增加,煤与瓦斯突出问题变得越来越严重。因此为了研究瓦斯突出的影响因素,进行了煤的工业分析、元素分析、煤岩分析[1-2]、显微结构及压汞和瓦斯的放散初速度等实验,对各个影响因素与煤的瓦斯放散初速度耦合影响因素进行分析得出结论。     

煤矿瓦斯事故的预防经验和体会

煤与瓦斯突出,是矿井中的一种复杂的动力现象,也是煤矿中的一种严重的自然灾害。近年业,全省加大了煤矿瓦斯治理力度,瓦斯爆炸事故明显下降,但煤与瓦斯突出事故降低不明显。在较大事故发生中,瓦斯突出事故死亡人数是瓦斯爆炸的2.4倍,成为煤矿事故的主要杀手。因此,加强煤矿煤与瓦斯突出防治,减少煤与瓦斯突出事故的发生是我矿实现矿区安全生产持续稳定好转而努力奋斗的目标。     

水力疏松提高煤层透气性防治煤与瓦斯突出

对芙蓉矿务局白皎煤矿20112回采工作面的水力疏松提高煤层透气性防治煤与瓦斯突出的效果进行了现场考察,主要研究了水力疏松对工作面回风风流瓦斯浓度以及措施后的钻屑指标的影响,考察结果表明:措施过程中工作面回风风流瓦斯浓度升高18～47%,工作面生产时瓦斯涌出量下降20.5～50%.风流中粉尘浓度下降60～90%.这表明水力疏松措施能有效地释放采场前方煤体的弹性能量和瓦斯,不仅防治了回采工作面煤与瓦斯突出,而且对防治工作面瓦斯超限和降低风流粉尘浓度也起到了一定的效果.是防治回采工作面煤与瓦斯突出,瓦斯超限和粉尘的一项综合技术措施.     

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     

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     

Journal of Donghua University ( English Edition) Contents of Volume 31

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Brief Introduction to “Journal of Jilin University( Science Edition) ”

<正>"Journal of Jilin University(Science Edition)"is a comprehensive academic journal in the fields of science sponsored by Jilin University and administrated by the Ministry of Education of the Peoples Republic of China.The journal started publication in 1955.The original name at starting publication was"Journal of Natural Science of Northeast People University",which was changed into"Acta Scientiarum Naturalium Universitatis Jilinensis"in 1958 owing to the name change of the university.The present journal name has