浅析公路工程方案优选与造价控制的关系

文章基于设计方案优选的原则,提出公路工程方案设计中应树立全寿命周期成本的理念,并进行多方案的技术经济比选,合理确定工程设计方案,平衡技术与经济的关系,以通过方案优选达到控制造价的目的。     

单轨条轨道电路混电问题研究

在轨道交通建设过程中,50Hz单轨条轨道电路得到了广泛使用。讨论了单轨条轨道电路混电故障的原因以及解决方案。     

散货船国际安全措施

本文简要分析了九十年代以来散货船海损事故及原因，回顾了几年来ＩＭＯ和Ｉ－ＡＣＳ寻求散货船安全措施的历程和合作，并提出还需解决的遗留问题及有关建议。     

微机数控加工程序译码的C语言实现方法

探讨了在 ＢｏｒｌａｎｄＣ＋＋３．１ｆｏｒ ＤＯＳ环境下微机数控加工程序译码的Ｃ语言实现方法，译码程序简单且通用性、移植性好，具有一定的实用价值     

时速160 km及以上客货共线铁路主要工程标准研究

目前建成的时速200 km的客货共线铁路,在实际运营中一般采用客(动车组)货不见面或降速至160 km/h速度的运营组织方式,因此对于今后类似项目是否还有必要按时速200 km客货共线铁路建设存在一定争议。通过调研、参考在建及运营项目,结合现行规范、标准及实际运营项目运输经验,对时速160 km、时速160 km(预留200 km)、时速200 km三类方案选用的主要技术标准进行详细汇总和对比分析,提出部分研究思路和实施建议,为后续类似项目速度目标值标准选用提供借鉴。研究结论为:项目初期就应结合项目特点、沿线客货运量需求、相邻路网构成、地形地貌等因素对速度目标值方案进行综合比选确定。     

基于有限单元法的隧道抗水压衬砌结构设计

研究目的：客运专线铁路隧道结构设计中往往会碰到水荷载作用计算难题，考虑抗水压衬砌结构设计仍然是隧道设计与研究热点之一。为检验隧道衬砌结构设计的安全性及防水性，有必要对抗水压衬砌设计结构进行内力计算。研究方法：针对金沙洲隧道特定地质条件和工程设计要求，采用基于有限单元法的荷载结构模型，对按围岩类别设计的3种隧道断面衬砌结构受力进行数值模拟。研究结果：研究得到了衬砌外水压力以及结构内力及分布特征，并验算了衬砌结构的安全系数。通过对计算结果分析验证，选出了各自围岩级别下合适的衬砌结构。研究结论：在全断面封闭排水的衬砌结构设计中，应着重考虑发挥混凝土的抗压性能；在富水区地下水头较大时。采用帷幕注浆法改善堵水圈的渗透系数，可有效降低衬砌的外水压力；选择仰拱外轮廓隅角半径、仰拱与曲边墙的连接处的半径以及仰拱厚度作为控制变量，可以改善衬砌结构受力特征。     

The train platforming problem: The infrastructure management company perspective

If railway companies ask for station capacity numbers, their underlying question is in fact one about the platformability of extra trains. Train platformability depends not only on the infrastructure, buffer times, and the desired departure and arrival times of the trains, but also on route durations, which depend on train speeds and lengths, as well as on conflicts between routes at any given time. We consider all these factors in this paper. We assume a current train set and a future one, where the second is based on the expected traffic increase through the station considered. The platforming problem is about assigning a platform to each train, together with suitable in- and out-routes. Route choices lead to different route durations and imply different in-route-begin and out-route-end times. Our module platforms the maximum possible weighted sum of trains in the current and future train set. The resulting number of trains can be seen as the realistic capacity consumption of the schedule. Our goal function allows for current trains to be preferably allocated to their current platforms.Our module is able to deal with real stations and train sets in a few seconds and has been fully integrated by Infrabel, the Belgian Infrastructure Management Company, in their application called Ocapi, which is now used to platform existing and projected train sets and to determine the capacity consumption.     

Scheduling of Intelligent and Autonomous Vehicles under pairing/unpairing collaboration strategy in container terminals

A new class of Intelligent and Autonomous Vehicles (IAVs) has been designed in the framework of Intelligent Transportation for Dynamic Environment (InTraDE) project funded by European Union. This type of vehicles is technologically superior to the existing Automated Guided Vehicles (AGVs), in many respects. They offer more flexibility and intelligence in maneuvering within confined spaces where the logistic operations take place. This includes the ability of pairing/unpairing enabling a pair of 1-TEU (20-foot Equivalent Unit) IAVs dynamically to join, transport containers of any size between 1-TEU and 1-FFE (40-foot Equivalent) and disjoin again. Deploying IAVs helps port operators to remain efficient in coping with the ever increasing volume of container traffic at ports and eliminate the need for deploying more 40-ft transporters in the very confined area of ports. In order to accommodate this new feature of IAVs, we review and extend one of the existing mixed integer programming models of AGV scheduling in order to minimize the makespan of operations for transporting a set of containers of different sizes between quay cranes and yard cranes. In particular, we study the case of Dublin Ferryport Terminal. In order to deal with the complexity of the scheduling model, we develop a Lagrangian relaxation-based decomposition approach equipped with a variable fixing procedure and a primal heuristics to obtain high-quality solution of instances of the problem.     

高等级道路水泥深层搅拌桩的设计、施工与检测

结合珠三角西北部地区地质情况和软土地基物理力学特点，阐述水泥深层搅拌桩在高等级道路软基处理中的设计、施工、检测控制。     

多人聊天程序的一种设计与实现

随着即时通信业务的快速发展,聊天工具的开发成为软件企业的关注的热点之一。本文介绍了实现多人聊天程序的一种方法,采用VC MFC应用程序的方式,实现可以同时连接多线程的客户／服务器程序。