基于前后轮联动转向的菱形客车操纵稳定性研究

根据菱形客车底盘布置的特殊性,建立了前后轮联动转向的二自由度操纵模型.在此基础上,推导出菱形客车的稳定性因数,从而确定了满足不足转向的条件;同时还分析了菱形客车的操纵稳定性以及整车参数变化对其产生的影响.结果表明:菱形客车的操纵稳定性受整车质量影响较小,而受前后轴轴距和整车质心位置的影响较大.不足转向条件和各参数变化对整车操纵稳定性的影响规律将有助于菱形客车的总体设计,具有较好的工程参考意义.     

立井提升设备的参数化选型设计

为实现立井提升设备选型设计的参数化设计,采用了Visual Basic6.0语言进行界面的设计和数据交换,使用Excel数据库进行设计计算,利用Access数据库进行设备的数据查询来完成选型设计部分;然后运用内嵌在AutoCAD的VBA作为开发工具,对AutoCAD2006进行二次开发,并在 AutoCAD 平台下实现立井提升设备系统图和提升机房布置图的参数化绘图.     

一种中型电动客车底盘设计

本文从纯电驱动的优势出发，详细介绍了一种中型电动客车底盘的总体布置，并分析这种总体布置的显著优点。     

铁路客车车体钢结构梁柱布置参数化设计

根据我国铁路通用客车车体的结构特点．以I-DEAS集成化软件所提供的OPEN Language为二次开发工具,以Visual C＋＋ 6．0为人机交互界面开发辅助工具,在Windows 2000／XP环境下．通过编程实现对I-DEAS的二次开发,设计了一个三维铁路客车梁柱布置参效化设计系统．该系统提高了客车车体设计效率．缩短产品设计周期．较好地满足了铁路客车技术设计的要求．     

客车乘客座椅布置的三维参数化设计

介绍了使用三维参数化软件进行客车乘客座椅布置的方法,使用该方法对一城市客车示例进行了乘客座椅布置设计,并分析了方案选择。该实例表明采用该方法可以提高客车座椅布置设计的设计质量和设计效率。     

铁路客车空调系统的自动调节

现行铁路客车空调系统的额定制冷量和采暖量是根据铁道部标准(TB1955—87)的客车采暖通风设计参数来计算的，考虑的是最不利的情况．为保证车内温度的稳定，建议根据外部温度的变化自动调节铁路客车空调系统，并提出了自动调节系统的设计思路．     

ActiveX Automation技术在参数化系统设计中的应用

介绍了ActiveX Automation技术、AutoCAD对象模型和ADO技术,以低净空桥式起重机参数化CAD系统设计为例,提出了以VB为编程环境,利用ActiveX Automation技术进行AutoCAD二次开发实现参数化设计的方法．完成了系统的总体设计,设计了系统的界面和整个结构,创建了系统的数据库,实现了系统部分结构图的参数化设计,并给出了部分代码．     

普通V带轮CAD系统开发

基于AutoCAD2000平台，利用ObjectARX3．0和VisualC 6．0语言设计开发了普通V带轮CAD系统．该系统能实现普通V带轮设计和参数化绘图．     

运用VB对AutoCAD二维实体的参数化设计

本文介绍AutoCAD2000与VB以ActiveXAutomation实现连接,利用VB的可视性设计界面实现可编程CAD设计,建立AutoCAD二维实体的参数化设计系统。     

基于模糊技术的客车内饰设计

由于风格、性能要求、经济性要求和人机工程等需求，客车内饰布置设计难以规范。本文描述了模糊技术在客车内饰布置设计中的开发应用。该应用系统首先进行内饰件三维造型设计，调入内饰件到虚拟现实环境中，利用中国人体模型进行可及性、视野等人机工程的测量分析，对测量结果进行模糊评价，然后通过模糊规则进行内饰内饰件的再设计决策。     

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