水泥稳定碎石冷再生混合举无侧限抗压强度试验研究

文章以国道324线岑溪一容县一级公路（容县段）为依托工程,对水泥稳定碎石冷再生混合料与普通水泥稳定碎石混合料分别进行无侧限抗压试验,测定两者强度变化情况。对比试验结果得知,相同水泥剂量下的再生混合料抗压强度略低于普通水泥稳定碎石混合料,相差值在0．4MPa内。     

正压加注机加热装置分析及改进

本文简要地介绍了成都西屋科技有限公司生产的正压加注机所存在的主要问题,对其加注机加热工作原理和加热方式进行分析和探讨。重点是针对加注机加热问题,结合实际生产维护提出改进方案,并进行加热方式改进,使得加注机加热效果取得显著效果。     

Why are work travel plans effective? Comparing conclusions from narrative and meta-analytical research synthesis

Reliable research synthesis is of high significance for a transport policy which tries to base its decisions on available empirical evidence. There is growing doubt whether the frequently used narrative approach provides a scientifically defensible way of synthesising a body of quantitative research results. The present paper demonstrates meta-analysis as a more objective and powerful alternative for this task. For this purpose evaluation data synthesised in two earlier narrative reviews on the effectiveness of work travel plans [Cairns et al. Making travel plans work: research report (former), Department for Transport, Local Government and the Regions (DTLR), London, 2002; Smarter choices—changing the way we travel. (Final report of the research project: The influence of soft factor interventions on travel demand. Research report for the Department for Transport.) London. Retrieved 1 December 2005, from , 2004] are meta-analytically re-analysed and compared with the conclusions drawn from the narrative synthesis of these data. Our meta-analyis provides only limited support for the conclusion that addressing parking is the hallmark of successful work travel plans. Our meta-analysis indicates that site and organisational factors as well as characteristics of the monitoring process are significant predictors of effective work travel plans, whereas Cairns et al. view little evidence for the impact of these factors.     

无缝线路现场移动式气压焊接质量的控制

长钢轨焊接是铺设无缝线路的一个极其特殊和重要的过程,原因在于其内部质量的好坏不能通过后续检验来判定,直接危及运输行车安全;其几何外形尺寸的平顺是保证无缝线路正常运用的关键。钢轨焊接质量不良,将使线路维修工作后患无穷,因此有效控制钢轨焊接质量成为目前急需探讨和解决的新课题。     

海洋核动力平台大破口事故下安全壳压力控制与影响

安全壳是海洋核动力平台的核安全二级耐压舱室,包容反应堆及一回路系统,是设计基准事故工况下限制放射性物质对环境释放的重要屏障。海洋核动力平台采用分散式压水堆型,主管道大破口是一种严重的设计基准事故,导致安全壳内产生高压高温的放射性气体。文章通过对安全壳压力控制技术的对比研究,提出了海洋核动力平台安全壳设计适合采用湿阱抑压控制措施的建议,并研究了压力控制对总体方案改进带来的收益,对海洋核动力平台总体方案设计具有指导意义。     

办公自动化系统安全问题和解决途径

随着交通系统办公自动化系统推广应用,系统的安全问题也日益严重。本文介绍了所采用的安全策略,重点介绍了全省交通CA认证管理系统组成结构。通过这些措施,办公自动化系统的安全性得到了有效提高。     

潜艇全船耐压结构有限元应力分析

本文对潜艇全船耐压结构进行了有限元应力分析，在此基础上，又进行了各局部结构的二级甚至三级离散有限元应力分析，比较了一般环肋圆柱壳、环肋圆锥壳、环肋锥－柱结合壳、横舱壁区域结构，耐压液舱区域结构典型点应力与现有解析算法结果的差异程度，得出了一些有工程实用意义的结论。     

An optical tire contact pressure test bench

An optical tire contact pressure test bench developed by the IMMa group is described. The measurement system is based on the frustration of total internal reflection (FTIR) of light. The test bench allows performing normal pressure distribution and patch contact shape measurements on passenger car tires. The system is based on the use of a laterally illuminated glass on which the tire leans. Between them a plastic interphase is located that will cause the FTIR of light. A video camera catches the formed shining image through the glass. The brightness level in each pixel of the image can be related to the existing normal pressure. The study of the contact patch provided by the bench makes it possible to characterize tire behaviour under different loading states, inflation pressure, tire defects and toe and camber angles. The bench incorporates a computerized load and control system of the tire operation parameters, an image acquisition module and a data acquisition system that allow monitoring and acting on the experimental variables of interest in the tests such as load on the tire and environmental conditions. A supporting mechanical system incorporated to the bench allows providing the tire with variable toe and camber angles. From the images obtained with this system, the maximum normal pressure points, total force, size and shape of the patch can be determined, which are related to the tire-use conditions. As an application example, results that show the patch size and shape under different load and tire inflation pressures are presented. A further application, which is the use of the system for the detection and study of defective tires is also presented.     

高速列车通过隧道时压力变化的数值模拟

采用三维粘性、不等熵、可压缩、非定常流的Navier Stokes方程,用有限体积法进行区域离散,对高速列车通过隧道时所引起的压力变化进行模拟。在模拟中同时考虑了列车速度、阻塞比、列车形状对隧道内压力的历时变化的影响,并将模拟结果与木川田一弥、森井宣的水槽实验结果和英国patchway隧道现场量测结果进行了比较,三者基本相吻合。实验及计算结果表明,隧道内产生的最大压力和列车速度、阻塞比等相关。     

船舶压载水管理系统管径的选择

本文主要介绍BalClOr○R压载水管理系统中主要管路直径的设计方法与选择的依据,进一步规范了压载水管理系统中管道直径与流速的设计,从而避免了由于管路压力降太大而出现的各种问题。