石家庄南环大桥大跨度钢箱梁架设

介绍在保证电气化铁路、编组站场正常运营情况下，运用宽幅式双导梁解决大跨度钢箱－混凝土结合的钢箱梁架设技术难题，重点阐述了施工方案、导梁设计，工艺要点等。     

直扩GPS中频数字接收机的实现

介绍了直接扩频序列系统的中频数字GPS接收机的设计和实现，给出了基于FPGA实现中频数字化、数字下变频、PN码捕获和载波同步等关键问题的解决方案。     

混合料配合比矿料组成设计的比例分配迭代法

针对混合料配合比设计中矿料组成设计常用方法的局限性,提出一种新的数解迭代法.该算法以设计级配的分计筛余量为分配基数,按各矿料的分计筛余值在混合料中所占的比例,计算理想状态下各矿料应提供的分计筛余值,通过迭代过程求解满足设计级配要求的混合料中各矿料的组成比例系数.与普通的试算法、正规方程法、规划求解法等数解法及图解法相比,该算法具有良好的收敛稳定性、方便实用性及较高的计算精度.     

勤工助学促进贫困大学生心理健康刍议

贫困大学生作为高校中的弱势群体,已引起社会的广泛重视。本文通过全面剖析贫困大学生的心理问题,探索贫困大学生在勤工助学过程中的健康心理,为高校开展心理健康教育提供理论依据。     

基于NS2现代信息网课程教学研究

当前网络方案和协议日趋复杂，原来的教学手段无法满足现在网络发展的需要，提出利用开源的网络仿真软件NS2作为教学中的辅助手段，提高网络教学的效果。     

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)。