缠绕式提升机主轴装置的优化设计

本文采用现代离散优化设计方法对缠绕式提升机主轴装置的结构参数进行了优化设计，这对改进提升机的设计方法，提高我国提升机的设计水平具有一定的理论和实用价值。     

GD包装机条盒透明纸检测器功能应用的改进

针对安装在CV条盒透明纸包装机中的条盒透明纸检测器在检测到透明纸偏移、褶皱等不合格条盒时均不能自动剔除,只是发出报警提示操作人员到提升机出口处在线辨认出条外包装缺陷条盒,带来了条外包装缺陷条盒进入提升通道流入成品仓库的隐患,同时加大了操作人员压力的这种缺陷,通过改进,充分利用现有设备,把条盒透明纸检测装置与提升机PLC控制系统相结合,使不合格条烟准确剔除在ORM提升机出口处。     

隧道内接触网滑轮组补偿装置偏磨卡滞原因分析及对策研究

本文针对隧道内接触网滑轮组补偿装置在施工安装、运营维护过程中存在的滑轮偏磨、补偿器卡滞现象,结合施工、设计、产品制造的实际情况,系统分析了偏磨卡滞的形成原因,提出了优化施工、产品改型的综合改进方案,解决了补偿装置偏磨卡滞问题,提高了补偿效率。     

缠绕式提升机主轴装置的优化设计

采用弹性基础梁理论对弹性圃板支撑下的卷筒结构和应力进行了分析和研究，进而利用现代离散优化设计方法对矿用双筒缠绕式提升机主轴装置的结构参数进行了优化设计，这对改进提升机的设计方法，提高我国提升机的设计水平具有一定的理论和实用价值。     

基于Pro/E矿井提升机的实体建模

矿井提升装置是采矿业的重要设备,其设计理论与分析较为复杂.以矿井提升机缠绕系统为原型,利用PRO/E三维实体造型设计软件建立矿井提升机虚拟样机三维实体模型,可以克服做物理样机周期长、损耗大的缺点,为提升机虚拟样机模型的运动学和动力学仿真建立基础.     

提升机过卷缓冲装置的分析及改进

针对提升机容易发生的过卷事故,分析了原有提升机过着缓冲装置的性能及特点,并提出改进方法。     

提升机过卷缓冲装置的分析及改进

针对提升机客易发生的过卷事故，分析了原有提升机过卷缓冲装置的性能及特点，并提出改进方法。     

简述副井绞车信号发送装置改造

提升机在矿井中担负着提升煤炭、矸石、升降人员和设备、运送材料及工具等任务。它是沟通矿井地面与井下的运输设备,是矿井的重要设备之一。而矿井提升机的安全保护装置是提升系统的重要组成部分,它直接影响提升机正常工作和安全运行,本文对副井绞车信号发送装置改造进行阐述。     

矿用提升机主轴装置的CAD研究

本文采用现代设计方法完成了缠绕式提升机主轴装置的计算机辅助设计系统 ,该软件包属于专用自动型CAD系统 ,用户根据需要从提升机系统中选出某一型号的提升机 ,依照计算机既定程序 ,自动完成计算机分析工作 ,并在绘图仪上输出主轴装置的装配图。     

转子编码电控系统在煤矿提升机控制系统中的成功应用

本文采用TKD-T3P型电控系统,与JK系列矿井提升机配套使用。该设备与2×800KW的交流绕线式高压电动机配套,对提升机的启动、加速、等速运行、制动减速、停车及换向进行控制,并具有提升机必需的电气保护和连锁装置。     

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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