Stability characteristics of ring-stiffened cylindrical shells under different longitudinal and transverse external pressures

Because ring-stiffened cylindrical shell structures have many merits, they are widely used in many areas. However, as the strength of steel increase continuously, ensuring of the structure stability is becoming more and more important. Therefore, it is necessary to carry on a more particular analysis. Based on the understanding and analysis of the characteristics of stability for a ring-stiffened cylindrical shell under uniform external pressure and under external single pressure, the characteristics under different cross uniform external pressures are analyzed, and the regularity of it is also gotten. The curve of stability given various geometrical parameters under different cross uniform external pressures is protracted by the analysis of the theory. The conclusion not only improves the theory structural mechanics, it also was important effects on engineering calculation and design.     

Ship cabin layout design using game theory

Game theory is a mathematical tool developed to understand competitive situations in which rational decision-makers interact to achieve their objectives. Game theory techniques have recently been applied to various engineering design problems in which the action of one component impacts that of any other component. In this article we first provide an overview of different game theory formulations, and then we present a survey on the approaches to ship cabin layout design, outlining several open research issues. To this end, we propose an effective method to facilitate the multidisciplinary decision-making process involved. A non-cooperative game is formulated, and the solution of this game is determined by the Nash equilibrium for the amount of equipment and furniture needed for the respective location and to achieve as high performance as possible in a cabin. The research was supported by the China Postdoctoral Science Foundation (20060390305).     

CRTSⅡ型板式无砟轨道系统在今后应用中的改进探讨

通过在京津城际轨道交通工程中的实践,对CRTSⅡ板式无砟轨道设计和施工中的缺点和问题发表了看法,并就梁面六面坡与平整度、桥面防水层、底座板钢筋绝缘、底座板齿槽、底座板连接器、灌浆工序等提出改进意见.     

水下及淤泥中施工临时道路的填垫技术

在天津滨海地区进行输电线路工程施工时,经常会遭遇雨池、虾池、盐池等,或在海边低洼地区的淤泥中进行。这需修建临时道路,文中论述了在这些地区修建临时道路的填垫技术。     

锰作业男工妻子妊娠结局的调查研究

为评价锰对接触男工妻子妊娠结局的影响，对314名接触工人和314名非接触工人进行了调查。结果表明，74个作业点的209 个空气MnO2样品的几何平均质量浓度为0.145（0.002－9.340)mg/m^3，作业点和样品的超标率分别为47.3％和40.2％。接触组和对照组的早产、自然流产、死胎死产、低体重儿、新生儿死亡、围产儿死亡和出生缺陷发生率未见显著性差异，接触组自然流产、死胎死产、低体重儿、围产儿死亡和出生缺陷的RR和95％CI依次是1.5(0.7-3.0)、2.2(0.6-8.9)、1.5(0.7-3.1)、2.0(0.6-6.6)和4.6(0.5-39.3)。     

摩托车及发动机设计信息管理系统的开发

在Windows XP以及FoxPro的基础上,开发出了一套摩托车及发动机设计信息系统。本文阐述了该系统的设计及功能,并讨论了该系统今后的发展方向。     

高压水射流对金属材料的喷丸强化及影响因素

基于对高压水射流技术的进一步研究发现,水射流可用于材料的表面喷丸强化。它有利于改善金属零部件表面的机械性能,尤其是在表面产生残余压应力,从而延长零件的疲劳寿命,其喷丸效果优于传统喷丸技术。另外,文章还简单地介绍了影响喷丸的一些因素以及今后研究的方向。     

全国解放区自建的第一条铁路——邯涉窄轨铁路

位于河北省西南的康二城、磁山是全国闻名的煤碳和铁矿的盛产地．抗日战争后期日本为了加紧掠夺康二城、武安一带的煤炭资源．决定修建一条邯郸至武安的“运炭线”．以运出康二城、武安一带的煤炭。之后在勘测中发现磁山地区铁矿优质．随即改变计划．将线路延长修至磁山．称为“运矿线”。     

基于AT89C52的PDT模拟器及实现

分析利用实际装备进行电子对抗训练的不足，介绍了用模拟器进行电子对抗仿真训练的实现方法，给出一个以AT89C52作为单片机系统的核心的PDT模拟器予系统设计，分析其中的软硬件关键技术．     

管理信息系统开发模式的分析与比较

管理信息系统(MIS)的开发,是计算机发展的一个重要领域,也是企业提升管理水平的一个重要手段。本文从MIS的实现角度出发,按照产生的先后顺序依次论述了具体实现模式的出现背景、主要原理、关键技术、特点以及优缺点。并且从基本原理和技术实现的角度对这几种模式进行了分析比较,得出MIS开发模式的发展趋势。