消氢催化剂的应用研究

通过对Pb／Al2O3，Pb/MnO2、Pd／C、Pd／TiO2四种消氢催化剂在不同条件下失效时间的试验研究，得出了温度、反应时间、和含钯量对催化剂失效时间的影响。试验结果表明：本文所用四种催化剂在脱氢反应中必须加温才能保持活性，否则要定期进行活化再生。     

沥青路面压实机械的选型与组合

简要介绍了沥青路面常用压实机械的特性，分析压实机械选型、配备及组合影响因素，特别对压路机有效时间利用系数进行了研究，并提出压实机械配备数量的计算公式。     

集装箱吊具模拟试验箱

本文介绍了集装箱吊具模拟试验箱的模拟吊具分列动作序列；图形显示吊具状态；测试吊具主要动作时间；自动检测吊具故障；检测吊具控制电缆故障等主要功能及设计思想。     

中国汽车企业订单管理与运作模式分析

“按订单生产正在成为国外汽车企业运作管理的一种主流模式,国内的轿车企业由于顾客群体、车型结构、合资背景与生产柔性等方面的不同存在几种不同的订单管理与运作模式,目前的主要方式是供应链协同管理方式,通过提高柔性与精益生产水平来降低库存与成本。从传统的生产模式走向供应链协同模式,再在走向基于个性化定制的按订单生产方式的每一步都是一次大的跨越,要求中国汽车企业在产品设计,生产流程与组织管理等领域都进行深刻的变化以应对未来的挑战。     

Delay Restoration of Single-Track Railway Rescheduling

On the basis of analysis of the principle of delay restoration in a disturbed schedule, a heuristic algorithm for rescheduling trains is developed by restoring the total delay of the disturbed schedule. A discrete event topologic model is derived from the original undisturbed train diagram and a back propagation analysis method is used to label the maximum buffer time of each point in the model. In order to analyze the principle of delay restoration, the concept of critical delay is developed from the labeled maximum buffer time. The critical delay is the critical point of successful delay restoration. All the disturbed trains are classified into the strong-delayed trains and the weak-delayed trains by the criterion of the critical delay. Only the latter, in which actual delay is less than its critical delay, can be adjusted to a normal running state during time horizon considered. The heuristic algorithm is used to restore all the disturbed trains according to their critical details. The cores of the algorithm are the iterative repair technique and two repair methods for the two kinds of trains. The algorithm searches iteratively the space of possible conflicts caused by disturbed trains using an earfiest-delay-first heuristics and always attempts to repair the earliest constraint violation. The algorithm adjusts the weak-delayed trains directly back to the normal running state using the buffer time of the original train diagram. For the strong-delayed trains,the algorithm uses an utility function with some weighted attributes to determine the dynamic priority of the trains, and resolves the conflict according to the calculated dynamic priority. In the end, the experimental results show that the algorithm produces ＂good enough＂ schedules effectively and efficiently in disturbed situations.     

T型梁砼的振捣工艺

通过施工实践，结合理论学习，就保证T梁质量的关键工艺振捣进行了介绍，并就振捣注意事项、方法、原则和经验进行了阐述。     

时间周期耗散结构的定性分析及应用

三分子模型的时间周期耗散结构在无扩散和有扩散时分别呈现浓度振荡与波样行为；通过Ｌｏｔｋａ－Ｖｏｌｔｅｒｒａ模型和ｓｃｈｌｏｇｌ模型的应用，可以对自然规律加以发现。这一原理可称为时间周期耗散结构。此原理可用于竞争预测。     

建设世界一流高原铁路--记刘志军部长、孙永福副部长赴青藏铁路现场办公

建设世界一流高原铁路的具体目标：把全线旅客列车旅行时间压缩到最短；全线设备达到“免维修”要求；沿线基本实现“无人化”管理。     

世界银行贷款项目“卫津路拓宽工程”的经济效益计算

本市以天津城市主干道卫津路拓宽改造工程为例，论述城市道路经济效益计算方法。按全天高峰小时、非高峰小时，分别计算机动车和非机动车的运营成本、时间价值及事故费用，采用有、无项目对比法．进行经济效益计算。经济效益中以车辆行程时间延误与路口时间延误的节约作为主要效益。