共查询到20条相似文献,搜索用时 62 毫秒
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This paper includes discussions on rail in urban areas and railway history. More specifically commonly used terms and definitions for rail services, policy and practice in urban areas are discussed followed by an overview of railway developments around the world. 相似文献
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文章简要叙述了二冲程柴油机共轨燃油喷射系统的工作原理,以及大型低速二冲程柴油机采用该系统后在结构形式、柴油机性能、经济效益及环境保护等方面所表现出的主要优点. 相似文献
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本文简要的介绍了南广线南宁至贵港段的线路走向方案,并从吸引客流能力、线路顺直、铁路运输效益、环境保护情况、地质条件、与城市规划的协调以及对城市的影响情况、工程投资等方面对线路走向方案进行分析论述。 相似文献
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This workshop considered the role of risks and rewards in rail transport by considering evidence on the impacts of industry structure, franchising and infrastructure charges. A schema for the allocation of risks and rewards was developed, which indicated that strategic risks should be borne by authorities and operational risks by operators, but that tactical risks were more difficult to allocate and appropriate reward mechanisms more difficult to design. The extent to which these difficulties can be addressed by competitive tendering and alternatives such as trusting partnerships and negotiated performance based contracts was considered. 相似文献
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分析轨道高碳钢焊接、异形截面焊缝成形以及焊接变形控制的方法,提出焊条的选用、坡口设计、焊缝强迫成形等工艺措施以及针对钢轨焊接采用的检测方法.该焊接和检测技术在港口工程实际使用中取得良好效果. 相似文献
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The impacts of the already decided increase in rail infrastructure charges in Sweden are described for various market segments within the rail transport system and on the aggregate level for society as a whole. The need for complementary measures in the road transport system is also discussed. Likewise, the paper also mentions the impact of increased rail infrastructure charges on certain significant industrial sectors. An increase in rail charges may reduce social welfare even though the reduction in rail transport mileage is small. This is mainly due to large non-internalised absolute externalities for road freight. For commuter trains, the infrastructure charges' share of the costs of rail transport is expected to rise to 13 percent, which in an international perspective still will be small. 相似文献
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舰载电磁轨道武器的技术分析 总被引:2,自引:1,他引:1
电磁轨道武器是一种利用电磁能推力的新概念动能武器,具有发射初速高、飞行时间短、毁伤效果好等技术性能优势.在简述未来海军电磁轨道武器火力支援工作原理的基础上,着重分析了该武器系统的射程、能源需求、技术优势,为武器系统的具体实用装备提供了技术分析,并介绍了美海军未来的装备设想,最后分析了舰载电磁轨道武器的研究重点和启示. 相似文献
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电磁轨道发射装置结构动力学特性分析 总被引:1,自引:0,他引:1
以新概念的电磁轨道发射装置为研究对象,从建立其动力学模型入手,将电磁轨道装置简化为一固定在弹性支撑上的无限长Bernoulli-Euler梁,通过适当理论假设,提出其通用动力学方程,利用傅里叶变换求解动力学方程,得到了电磁轨道装置的临界速度和导轨的动力学特性理论公式,最后应用有限元分析软件仿真了电枢速度、轨道弹性模量、轨道密度、轨道截面转动惯量、支撑座弹性系数等参数对导轨动力学特性的影响.仿真结果显示,电枢临界速度时导轨变形最大.研究成果可为电磁轨道装置的结构设计和减振控制提供进一步的理论支撑. 相似文献