新建铁路山西中南部铁路通道穿越红泥寺自然保护区的影响分析及措施和对策

当前,由于我国自然保护区建设的大力推进,自然保护区数量、面积都有了很大的提高。随着我国经济持续快速的发展,铁路工程由于其受工程地质、技术条件、经济据点等因素影响,有时难以绕避自然保护区。本文结合新建铁路山西中南部铁路通道,将铁路工程建设对自然保护区的影响以及针对影响采取的科学防范措施和对策做以简要的论述。     

铁路参与铁水联运无水港建设的思考

在阐述铁水联运集疏运系统的构成和建立条件的基础上,分析了铁路参与无水港建设的可行性和模式。铁路应通过全面参与无水港建设,加快融入综合运输体系的步伐,可采取改造现有场站设备与设施和新建物流中心两种方式参与无水港建设,同时应注意以下4个问题:采取多种途径解决资金问题;重视信息管理系统建设;提供优质运输服务;注重开发主业副产品。     

关于“走出去”铁路建设项目概预算编制的几点心得

结合我国铁路＂走出去＂项目概预算编制工作,阐述编制我国周边国家铁路建设项目概预算时应注意坚持的几点原则。＂走出去＂项目概预算编制应注意的问题为,先将其视为国内项目编制概预算,再进行国外人工费调整,以及材料费（直发料、厂发料、当地料、燃油料）、运价、取费调查,在掌握基础资料的基础上,通过对工料机资料的综合分析,合理确定综合单价、取费标准等,使编制的投资概算全面、科学、合理,真实反映项目的造价水平。     

新九燕山隧道主洞与辅助坑道交叉口施工技术

根据包西铁路大断面红黏土隧道新九燕山隧道施工实例,就斜井和大跨度红黏土隧道交叉口施工方案进行选择,并对斜井向正洞施工方法的转化、施工技术措施等进行阐述。     

高原富水区域连通河沟段隧道综合施工技术

详细介绍了关角隧道4号斜井施工过程中,穿越与地表河谷连通性密切地段的综合处理技术,其中包括连通试验测定,地表处理等措施。施工实践表明,所介绍的施工方案合理可行,效果较好,经济效益显著。     

施工坐标系在工程测量中的应用

介绍了施工测量工作中常用的施工坐标系转换以及放样程序在铁路站场工程建设中的具体应用,应用效果良好,通过工程实例证明运用施工坐标系定位放样在工程测量上的重要性。     

大功率电力机车变形吸能元件加工难点及解决措施

对大功率电力机车的牵引缓冲装置变形吸能元件支撑板的功能、结构、主要工艺难点进行分析,介绍一种新型的加工工艺方法,大大地提高了其生产效率.     

Regulatory reform and freight mode choice

Reform of trucking Vehicle Weights and Dimensions (VWD) regulations in Canada is now underway. The effect these reforms will have on the freight transportation industry are only recently the subject of research. This paper is part of this new research effort, aimed at understanding how regulatory reform in the trucking sector will affect the existing competitive relationship between trucks and the railways. The paper presents the results of study and research into modelling the relationship between mode choice and the service characteristics that are affected by VWD reform.Using several periods of data, a series of econometric models are developed which help to elucidate the relative relationships between the mode service characteristics for both of the principal interprovincial freight modes. A technique is developed and presented to model railway user costs in order to overcome the complex and often unrepresentable pricing activities of Canadian railways.The strength of the developed econometric models is presented, including their significance and statistical reliability. This is further reinforced by the similarities exhibited by all the models in the series. The selected model is applied to predict market service responses required of the railway industry in order to compete with the trucking sector now adapting to the new regulations.The impact of the newly implemented vehicle weight and dimension reform on the rail transportation industry is analyzed and railway industry improvements aimed at maintaining its market share are presented. The results predicted by the model show that railway user cost reductions should be moderate, and likely less than the level of inflation over the period of time when trucking converts its fleet to take advantage of the new regulations.Abbreviations AASHTO American Association of State Highway and Transportation Officials - CCMTA Canadian Conference of Motor Transport Administrators - EPI End products, inedible commodity classification - GVW Gross Vehicle Weight - NA 1988 VWD National Agreement - RTAC Roads and Transportation Association of Canada - VWD Vehicle Weight(s) and Dimension(s) - WA 1988 VWD Western Agreement     

进气预混甲醇降低柴油机碳烟与NOx排放的影响参数研究

在485QDI自然吸气直喷式柴油机上研究了不同喷嘴、不同供油定时、不同喷醇的起点对进气预混甲醇发动机的碳烟、NOx排放和经济性的影响。研究结果表明，为了降低碳烟和NOx排放以及提高燃油经济性，与燃用纯柴油的发动机相比，进气预混甲醇发动机的柴油喷射定时可以保持不变或稍小，但燃油喷嘴的孔径应适当减小，预混甲醇的发动机负荷起点应适中。     

苏嘉杭高速公路二灰碎石基层施工

介绍了上海同济大学提供的嵌挤型二灰碎石级配施工方法，对于该种级配二灰碎石具体施工工艺进行叙述，并提出了针对该种级配的施工要点和注意事项。