蒙西华中铁路基础设施维修模式与生产力布局研究

蒙西华中铁路维修模式与生产力布局是影响建设投资与运营成本的重要因素。基于提升基础设施维修效率、降低维修成本、提升公司效益的目标,通过对国内外铁路维修模式的比较,结合重载铁路特征,研究了蒙西华中铁路基础设施维修模式,设计了组织机构与布局方案,提出了大中修模式、天窗设置模式与救援列车生产力布局方案,为蒙西华中铁路建设期设备设施合理配置与运营期养护维修管理提供技术支撑。建议蒙西华中铁路采用综合维修模式,按照站区一体化的管理方式设计组织机构,大中修建议以委外模式为主,天窗设置为240min左右垂直天窗,救援列车可选择委托救援方案和自建救援体系方案。     

齿轨旅游交通车辆小型化需求及总体方案研究

为推动国内山地旅游轨道交通发展,提升齿轨旅游交通系统生命力,助力交旅融合大发展。基于对国内山地旅游交通工程地形特征、环境特点、客流等级、投资模式等工程特点的分析,提出满足国内齿轨旅游交通小运量、高环保、低造价需求的车辆小型化目标,并对车辆小型化总体方案进行研究。通过理论分析、类比研究、数值计算等手段,对齿轨车辆轨距、车体尺寸、轴重、编组等关键指标展开研究,提出两种小型化车型及相关指标的取值建议,可为后续工程设计提供参考。     

无缝线路500m长轨施工控制技术

铁路铺轨施工是铁路建设中的一个关键环节,新建线路一次性铺设长钢轨的应用越来越普及,研究与应用新型高效的现代化铺架机械和施工技术以及科学的组织与管理方法成了必然趋势。轨道的高平顺性对提高运营质量效果显著,少维修和免维修轨道对提高运营效益作用巨大。500m长钢轨的铺设技术难度大,对设备和工艺要求高,焊接质量、无缝线路的应力放散和锁定等都是一个较新的课题。为解决500m长轨无缝线路施工技术问题,本文详细阐述了500m长轨的铺设、焊接、放散与锁定等关键技术问题,为解决长轨无缝线路施工技术问题提供技术参考。     

重载铁路综合检测列车和数据综合分析系统研究

为了更好地提升重载铁路线路检测维修质量,立足重载铁路线路维护检测发展现状,介绍重载铁路综合检测列车组成情况和关键技术的应用,并从钢轨伤损分析、轨道大值病害分析、接触网与轨道检测数据以及轨道几何、路基道床检测数据分析几方面着手对重载铁路综合检测列车数据综合分析系统的应用进行详细分析,旨在为相关研究人员提供参考,切实保障重载铁路列车运行的安全性和稳定性。     

幸福向肯尼亚内陆延伸

<正>10月16日,肯尼亚内罗毕至奈瓦沙标轨铁路首班列车发车,标志着公司承建的肯尼亚内罗毕—马拉巴标轨铁路(内马铁路)一期工程正式建成通车。内马铁路是蒙内铁路延长线,是东非铁路网的重要组成部分,也是肯尼亚2030年远景规划的旗舰项目,将大幅提高当地运输效率,带动沿线经济社会发展。     

基于分类分级体系的铁路基础设施养护维修策略优化方法

我国铁路规模不断扩大，运行速度不断提高，运输任务不断增加，对铁路基础设施养护维修质量和管理水平提出了更高要求。考虑到铁路作为开放复杂系统，运营与维护直接受到沿线环境影响，本文从列车速密重、运输组织、基础设施类型、沿线自然环境等维度出发，构建一种系统性铁路分类分级体系，并提出基于分类分级体系的铁路基础设施养护维修策略优化方法，为铁路基础设施养护维修向精细化方向发展提供支撑。     

基于熵权-Topsis的市域铁路与城市轨道交通贯通模式选择研究

市域铁路与城市轨道交通贯通运营能够充分发挥轨道交通整体效益，降低换乘站压力，提升旅客服务水平。针对市域铁路与城市轨道交通贯通运营形式，本文提出城轨单向贯通、市域单向贯通以及双向贯通三种贯通运营模式并分析。考虑线网性能、服务水平、投资成本、运营组织四种影响因素，基于熵权-Topsis法，建立多时段市域铁路与城市轨道交通贯通运营模式综合评价模型。最后以重庆市市域铁路江跳线与轨道交通五号线为案例，利用三种不同分布特征的客流进行研究，综合得出优选模式为市域单向贯通模式，与实际情况一致，验证了模型的准确性，为多种制式轨道交通贯通运营研究和发展提供理论参考。     

铁路工务线路养护常见问题与对策分析

铁路养护管理要求铁路工务线路养护工作必须有高质量的水准,并在不断加强铁路工务线路管理工作的同时,有效提高铁路工务线路工作的安全度及可靠性。鉴于此,阐述了我国铁路工务线路养护维修的基本概况,全面分析了铁路工务线路养护中存在的各种问题,并提出了一系列提高铁路工务线路养护管理水平的相关措施,以期为我国建立全面的铁路工务养护管理体系提供参考。     

我国铁路发展钢铁物流的问题与对策

阐述了钢铁行业生产和销售、流通体系建设以及未来发展趋势,从服务质量、运力、综合费用等方面分析铁路在钢铁物流存在的问题,从钢铁物流发展模式、定价机制、履行合同、加强货场改造和转型以及人才培养几方面提出铁路发展钢铁物流的建议。摘要:     

城市悬挂式单轨铁路邮票话趣

在城市轨道交通中,架空的独轨构成的铁路称为单轨铁路(monorail),其中按车辆行走的状态可分为悬挂式和跨座式两类,这期先谈有关悬挂式铁路及其纪念邮票。     

Survey of R&D in PRT systems

A survey of research and development in advanced transit has been made by Chalmers University of Technology in Gothenburg in cooperation with Trans21 in Boston. Summary findings are reported for fourteen academic research programs and ten development programs for PRT. An earlier version of this paper was presented at the International Conference of PRT and other Emerging Systems held in Minneapolis in 1996.     

The Impact of Container Type Diversification on Regional British Port Development Strategies

Abstract

Despite a concentration of container traffic in the southeast of the UK over the last few decades, regional ports are attempting new development strategies to capture or retain specific traffic segments. These include intra-European short-sea traffic and a potentially increasing feeder market. These trends are reflected in the movement of different container types, which result in a number of planning challenges related to changing infrastructural and operational requirements. This paper uses highly disaggregated data on container type movements to address three issues that can inform these planning challenges. First, the imbalance of trade resulting in empty container repositioning; second, the requirement for gauge-cleared rail routes to cater for the increasing proportion of high-cube containers; and third, the specialisation of European short-sea traffic at secondary UK ports. The results reveal the disproportionate repositioning of empty containers at Scottish ports and the importance of 45?ft, high-cube and pallet-wide containers at regional ports, highlighting their focus on intra-European short-sea traffic and raising difficulties relating to their lower quality of landside infrastructure (particularly rail) in comparison to the large south-eastern ports. The potential repercussions on hinterland infrastructure development raise questions about both public and private sector responses to regional port development.     

管道风险分析指数评分法中分值调整初探

管道风险分析指数评分法中重要步骤之一就是确定影响管道事故因素的权重,各个管道风险因素在整个管道事故中所占的权重是不相同的。针对目前管道风险分析指数评分法基本假设之一（各因素的分值范围都是0～100分）,为了更加客观、准确、合理地反映各个风险因素对于管道事故的影响程度,提出并论述了依据层次分析法的数学逻辑性进行综合计算得出管道风险因素的权重,然后对评分法中各个因素的最高分值,根据其权重不同进行相应调整,从而增强评价者对风险因素的认识和评判能力,提高管道风险评价结果的准确性。     

A century of evolution of the accessibility concept

The concept of accessibility has acquired numerous meanings along multiple dimensions during the century of its evolution. This essay argues for the salience of two dimensions: application-based and definition-based. In its application, accessibility has incorporated positive and normative dimensions which have varied in prominence over time. In its definition, accessibility has varied between a mode of evaluation incorporating measured mobility and proximity, on the one hand, and a predefined market basket of urbanist improvements to transportation and land use systems, on the other. Advocates of the accessibility shift should emphasize both the measured approach to accessibility and accessibility’s normative side.     

天然气站往复式压缩机活塞失效分析

针对天然气站往复式压缩机活塞的断裂事故,运用失效分析方法,开展了活塞断口扫描电镜分析、能谱和金相分析。根据断口形貌的电镜和金相观察结果,结合理论知识,分析确定了该活塞发生断裂事故的主要原因,即在特定工况下该活塞的材料缺陷是造成断裂的主要因素。     

中国城市道路规划方位性问题研究

文章结合中国的传统建筑文化理念和现代科学原理,从历史文化、能源节约、环境保护、房地产定价、交通安全等多方面分析研究了城市道路在规划和设计时所应遵从的定向规则。     

Predicting queue variability to enable analysis of overload risk

ABSTRACT

Predicting the risk of traffic demands and delays exceeding critical limits at road junctions, airports, hospitals, etc., requires knowing how both mean and variance of queue size vary over time. Microscopic simulation can explore variability but is computationally demanding and gives only sample results. A computationally efficient approximation to the mean is used in many modelling tools, but only empirical extensions for variance in particular situations have been available. The paper derives theoretical formulae for time-dependent and equilibrium variance, believed to be novel and to apply generally to queues covered by the Pollaczek–Khinchin mean formula, and offering possible structural insights. These are applied in an extended approximation giving mutually consistent mean and variance estimates with improved accuracy. Tests on oversaturated peak demand cases are compared with Markov probabilistic simulation, demonstrating accuracy (R^2?>?0.99) for typical random, priority-like (M/M/1) and traffic-signal-like (M/D/1) queues. Implications for risk analysis, planning and policy are considered.     

Planning guidelines for metro–bus interchanges by means of a pedestrian microsimulation model

The big paradigm for cities nowadays is to study the movement of pedestrians at the interface between metro and bus systems – metro–bus interchanges. When these interchanges are not well designed, walking is inefficient and can be unsafe for pedestrians. This paper analyses, by means of a pedestrian microsimulation model, metro–bus interchange spaces in order to propose planning guidelines for the city of Santiago de Chile. Specific objectives are (1) to identify the variables that provide efficiency and safety in those spaces; (2) to simulate different scenarios using the pedestrian simulation model LEGION; (3) to propose planning and design guidelines for pedestrian spaces at metro–bus interchanges; and (4) to contrast the recommendations in the recently opened terminal station on Line 1 of Metro de Santiago: Los Dominicos Station.     

生命大过天

文章介绍了广西壮族自治区公路管理局开展专项行动,治理以桥梁为重点的交通基础设施安全隐患的情况,针对在役桥梁、在建桥梁和农村公路桥梁存在的安全隐患提出了相应的治理措施。