城市轨道交通噪声影响的效益评价

分析了城市轨道交通噪声的产生与传播过程.根据已有的研究成果整理出了城市轨道交通噪声影响的理论计算方法,得出城市轨道交通线路不同敷设方式噪声影响的范围和程度.在此基础上,借用成本效益理论,提出了城市轨道交通噪声影响的效益评价方法.     

轨道车辆电容储能式电阻点焊工艺研究

文章针对不锈钢地铁车辆点焊质量问题,采用电容储能式电阻点焊工艺对典型板厚组合进行工艺试验研究,并对比分析其点焊接头内外部质量与传统中频逆变点焊工艺之间的差异。试验结果表明:电容储能式点焊工艺无论是焊点外观质量还是内部熔核形态以及力学性能指标均优于现有中频逆变点焊工艺,具有提高轨道车辆点焊质量的工程化应用意义。     

Investigating the effect of travel time variability on drivers' route choice decisions in Shanghai,China

Abstract

This paper investigates the effect of travel time variability on drivers' route choice behavior in the context of Shanghai, China. A stated preference survey is conducted to collect drivers' hypothetical choice between two alternative routes with designated unequal travel time and travel time variability. A binary choice model is developed to quantify trade-offs between travel time and travel time variability across various types of drivers. In the model, travel time and travel time variability are, respectively, measured by expectation and standard deviation of random travel time. The model shows that travel time and travel time variability on a route exert similarly negative effects on drivers' route choice behavior. In particular, it is found that middle-age drivers are more sensitive to travel time variability and less likely to choose a route with travel time uncertainty than younger and elder drivers. In addition, it is shown that taxi drivers are more sensitive to travel time and more inclined to choose a route with less travel time. Drivers with rich driving experience are less likely to choose a route with travel time uncertainty.     

Evaluating the operational performance of airside and landside at Chinese airports with novel inputs

ABSTRACT

This paper evaluates the operational performance of airside and landside at Chinese airports with two novel inputs. Furthermore, the airport landside operation is decomposed into passenger-terminal operations and cargo-warehouse operations. One novel input is the capability of the runway system which is introduced into airside performance evaluation. The other novel input is cargo warehousing which is introduced into landside performance evaluation. To address multiple optimal solutions when estimating Returns to Scale in Data Envelopment Analysis, we adopted the Zhu and Shen method. This empirical study shows that neither the number of runways nor total runway length is a genuine index of runway system capability in the evaluation of airside performance. Only four airports achieved full efficiency in all eight measures while eight airports did not achieve any full efficiency. In addition, one airport did not perform well in the benchmark analysis.     

校车座椅动态试验乘员损伤研究与优化

以校车座椅为研究对象,以LS-DYNA为工具,采用分式析因试验设计及全因子试验设计方法,研究约束系统参数灵敏度,从而找出对乘员加权伤害指标（WIC）影响较大的设计参数。约束系统参数优化后,乘员WIC比初始值降低了20%,优化效果显著。     

现场总线技术在机舱自动化系统中的应用

本文概述了现场总线技术及其在机舱自动化方面的使用情况，重点介绍了CAN总线技术及其在船舶方面的应用，并结合实例，介绍了基于CAN总 线的机舱自动化系统的机构和CAN模块的开发。     

公路路面施工中沥青摊铺的施工技术分析

本文结合作者多年的施工经验,分别从沥青摊铺的技术特征、摊铺前的技术准备工作、摊铺施工过程中的技术运用以及摊铺完成后的测查等阶段,综合分析了沥青摊铺技术在公路路面施工中的运用,以期为同类工程提供借鉴.     

铁路建设取得巨大成绩

铁路建设抓住黄金机遇期,制定实施了加快铁路建设的发展战略,发达完善的铁路网建设全面展开,取得了令人瞩目的巨大成绩。     

以人为本的香港轨道交通及人行接驳规划

持续跟进人们需求和环境的变化,介绍香港高效而稳定的铁路营运。香港正在筹备及建造4条市区新线及1条跨境高速铁路和内地高铁接轨。在综合轨道及城市规划中,利用TOD模式和无缝衔接周边的土地开发,将人行接驳系统和车站附近的主要活动点无缝结合。港铁项目管理融合了人才发展、加强成本控制及管理,积极鼓励小区人士提供意见和持分者参与,落实"以人为本"的理念。     

软弱围岩特大跨度隧道模型试验技术及应用

利用大型地质力学模型试验台架开展软弱围岩特大跨度隧道开挖模型试验的技术研究,主要包括软弱围岩相似材料的配制方法、模型试验台架及加载系统、围岩应力量测系统及围岩位移量测系统。采用单点薄膜压力传感器进行围岩应力量测,具有准确、灵敏和扰动小等特点。文章基于光栅尺与PIV的围岩位移量测技术,开展了一组软弱围岩特大跨度隧道毛洞开挖模型试验,研究隧道开挖对围岩应力场和位移场的影响规律。结果表明,模型试验系统具备优良的操作性能及先进的测试水平,可满足大型岩土模型试验研究需要,对实际工程有一定的指导意义。