上海西藏南路南段改拓建工程方案概述

结合上海西藏南路南段（复兴东路一中山南路）改拓建工程，介绍了在规划红线宽度受限、周边建设条件受制约的情况下，对该路段建设规模的论证及平面线形优化的方法，并对拓建方案进行了比选。     

浅谈铁路信号设备的机械结构设计

1 铁路信号设备典型结构模式 通过长期的实践,铁路信号设备的壳体逐步形成了盒、箱、柜(包括屏)、台四大基本结构模式.但由于铁路信号设备功能、使用场合的差异及客户对多样化的需求,使铁路信号设备的式样繁多.     

紧抓历史机遇夯实发展基础为实现中铁物资战略目标开好头起好步

1 在复杂多变的经济环境中顽强拼搏,2008年各项工作取得了新的成绩 1.1 生产经营继续较快发展,取得了良好业绩 全年实现营业收入1002亿元,历史性地迈上了千亿元的大台阶,比上年增长26.8%.完成了国资委经营业绩考核指标.     

基于Matlab的客车内摆门运动特性分析

建立客车内摆门的机构运动模型并推导出运动公式,运用Matlab软件得出内摆门滑槽滚轮中心的运动特性曲线,分析门滑槽及门内置铰链在不同位置对滚轮运动情况的影响。     

浅谈二手车及其鉴定评估方法

中国是世界上汽车产销量最大的国家,随着汽车存有量不断攀升、汽车消费文化的提升,汽车消费环境的不断优化,二手车的消费将会成为汽车消费的重要支撑,而在二手车消费的过程中,就需要对二手车的价值进行科学有效的评估。     

安康市汉江景观桥设计方案研究

安康依汉江而建，桥位处周边建筑具有重要的历史文化意义，且桥位两边连接安康重要的街道和火车站。汉江景观桥在桥位走向、桥型选择与周边历史文化的契合度、景观桥与汉江两边道路的衔接等方面是重点研究的课题，从设计思路、功能定位、桥位比较、桥型方案、造价等对安康市汉江景观桥设计方案进行了研究。     

Flow-field guided steering control for rigid autonomous ground vehicles in low-speed manoeuvring

ABSTRACT

This paper studies the low-speed manoeuvring problem for autono-mous ground vehicles operating in complex static environments. Making use of the intrinsic property of a fluid to naturally find its way to an outflow destination, a novel guidance method is proposed. In this approach, a reference flow field is calculated numerically through Computational Fluid Dynamics, based on which both the reference path topology and the steering reference to achieve the path are derived in a single process. Steering control considers three constraints: obstacle and boundary avoidance, rigidity of the vehicle, plus the non-holonomic velocity constraints due to the steering system. The influences of the parameters used during the flow field simulation and the control algorithm are discussed through numerical cases. A divergency field is defined to evaluate the quality of the flow field in guiding the vehicle. This is used to identify any problematic branching features of the flow, and control is adapted in the neighbourhood of such branching features to resolve possible ambiguities in the control reference. Results demonstrate the effectiveness of the method in finding smooth and feasible motion paths, even in complex environments.     

Global supply chain and port/terminal: integration and competitiveness

Much has been said of the importance of port and terminal integration in the supply chain. Authors have stressed the importance of agility to the port environment, which involves being proactive along supply chains, facilitation of intermodal integration, as well as organizational integration and partnership between ports and users. Despite the well articulated importance of the issues, little has been offered in terms of conceptualizations and empirical evidence of what really is meant by port/terminal integration in the supply chain, how such integration can be measured and quantified as well as the extent to which different ports/terminals in the world are integrated in the supply chain and competitive performance implications arising thereof. This paper aims to make a contribution in this respect by (i) reviewing the relevant literature on supply chain integration and port integration in the supply chain, (ii) conceptualizing measures for port/terminal integration in the supply chain, (iii) empirically testing the influence of port/terminal integration in the supply chain on port competitiveness and (iv) outlining the significance and value of the study for port operators, shipping lines, transport providers and for further research.     

舵柄与舵杆无键液压套合连接推入量计算

介绍了舵柄与舵杆无键液压套合工艺的优点。对这种工艺的工作原理、受力计算及液压套合推入量计算作了分析并探讨其实用的计算方法和计算公式。