影响角联风路稳定性的相关风路研究

在对目前角联风路自动判别数学模型分析的基础上，应用图论和集合论的方法对其进行深入研究，提出了角联风路的关键影响风路、非关键影响风路等与角联风路稳定性分析相关的新概念。给出了确定角联风路关键影响风路和非关键影响风格的数学模型，并进行了实例分析，为进一步研究角联风路稳定性奠定了基础。确定角联风路的关键影响风路和关键影响风路对于日常通常通风管理、一通三防、通风系统可靠性、灾变时期风流控制，通风系统改造都有重要意义。     

广义角联结构研究

研究复杂网络由两部分内容，一是研究角联风路及其影响角联风路的关联风路的性质和稳定性；二是研究复杂网络中那些风路是角联风路以及影响角联风路的关联风路，即所谓的角联结构。文章论述了基于有向图的通路法集合算法不能够确定网络的全部角联结构，提出了确定网络全部角联结构的基于无向图的路径集合算法。得出了角联风路仅取决于网络的拓扑关系，而与通风系统参数无关的结论，从图论的角度给出了角联风路的广义定义。     

风路可靠度确定数学模型

针对目前研究矿井通风系统可靠性时,主要的研究参数是风量,即认为风量不失效则风路不失效的问题。提出了考虑风量、粉尘浓度、温度、有毒有害气体浓度指标的风路可靠度的定义,即研究可靠度时,既要考虑风流的数量,又要考虑风流的质量,这在矿井火灾时期尤为重要。根据风量动态监测结果,利用概率论、数理统计和可靠性原理的知识,提出了风路可靠度的理论计算数学模型,该模型的建立对矿井通风系统可靠性研究具有重大的意义。     

双回风井并联通风特性数值分析

针对双风井风机并联运行的特性问题,文中以宝积山煤矿通风系统为例,采用网络解算方法,分别研究了通风网络和通风机的特性。通风网络方面,公共网络风阻与风井回风段风阻比值越大,通风压降也越大,另外,通风功率呈现先增大后降低的规律;通风机方面,当通风机性能工况调整时,对公共风路通风压降有影响,同时也影响另一通风机性能,如果功率增大,公共风路压降增大,另一通风机工况点上移。研究规律对于现场调整通风系统具有指导作用。     

矿井通风系统可靠性分析理论研究

本文从矿井通风系统的总体出发．详细分析了通风构筑物、扇风机和风网各分支之间的相互联系和影响．给出了通风系统及其各单元可靠性的定义．建立了矿井通风系统可靠性分析的数学模型。     

提高矿井通风系统可靠性问题探讨

本文针对矿井通风系统井下巷道纵横交错的复杂结构特点,分析了矿井通风系统存在的主要问题,总结了提高矿井通风系统可靠性的技术手段,提高对矿井通风系统可靠性和煤矿安全生产问题的认识。     

矿井通风"人-机-环境"系统可靠性研究

矿井通风系统是矿井生产系统的重要辅助系统，其可靠性高低对矿井生产和安全管理有着直接的影响。在其生命周期中与其它子系统共同孕育发展，也是人机环境系统相互作用而构造的整体结果。对由人、机与环境组成的通风系统可靠性，除了研究机的可靠性之外，还应该对人和环境的可靠性进行全面而深入的探讨。用可靠性工程方法、从人机工程学的角度对矿井通风系统可靠性进行研究，给出了矿井通风“人－机－环境”系统可靠性的定义和数学模型。指出只有对系统进行全面分析，才能有效提高矿井通风系统的可靠性。     

基于冷储备可修模型的矿井主扇系统可靠性分析

结合矿井通风系统实际，依据可靠性工程中冷储备可修系统相关理论，探讨了矿井主扇系统可靠性分析方法；推导出了主扇系统的可靠度及首次故障前平均寿命的计算公式；结合现场实际，进行了实例验证；根据主扇系统可靠性各项主要指标数据，分析了影响主扇系统可靠性因素。为现场通风技术管理人员进一步掌握矿井主扇的可靠运行提供重要依据。     

塔山矿两台主要通风机联合运转通风角联控制技术研究

本文通过介绍塔山矿两台主要通风机联合运转通风系统调整过程,并运用相关理论分析在两台主要通风机联合运转后出现的角联风路特点,提出了治理角联风路的一种有效方法,为其它矿井解决自身通风角联以及多台主要通风机调节相互影响问题提供了很好的借鉴。     

矿井通风网路计算方法及应用

针对金川二矿区地面无主扇，井下采用多级机站通风的特点，系统地研究确定了仿真系统三要素，即通风系统、数字模型、计算机。角联风路自动识别和风网特征图自动绘制是该仿真系统所独有的特殊功能。系统采用的基于网络最小调节功耗概念的网络优化调节通路法既不同于线性规划法也不同于非线性规划法。在AutoCAD环境下实现了通风仿真系统的可视化。     

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     

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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