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近年来,我国LNG燃料汽车已进入快速发展通道,在短短3年时间内,国内已经有新疆、山西、内蒙古等地的LNG重型卡车及北京、杭州、深圳、乌鲁木齐、昆明、海口、湛江、张家口等城市的LNG公交相继投入了运行,且这一城市群体还在迅速扩大。随着国家对发展清洁能源汽车的重点关注,以及人们对LNG汽车的逐渐了解,车用LNG市场开始呈现出欣欣向荣的一面。此外,《节能与新能源汽车产业发展规划(2012-2020年)》(以下简称《规划》)等近期密集出台的产业扶植政策也无疑也为汽车工业发展打了一剂强心针,"组合拳"的连续出击必将带动节能与新能源汽车及其相关产业的转型与发展。 相似文献
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<正>在本届丝绸之路国际卡车集结赛上有两辆车特别引入注目,一辆采用柴油发动机的橙色物流运输车,一辆采用LNG燃料的白色LNG槽车,分别满足了国四和国五排放标准,从外观造型到性能表现都堪称一流。"这两辆车无论是配置、技术,还是舒适性都非常好,代表了中国重卡现在和今后的发展方向。"一路走来,这是记者听到对这两辆联合卡车最多的评价。联合卡车何以能获得如此赞誉呢集瑞联合卡车营销服务有限公司副总经 相似文献
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继2011年,2012年先后推出全新Actros重型长途运输卡车和全新Antos重型配送卡车后,梅赛德斯-奔驰卡车在今年继续加强其产品攻势,推出更多搭载欧六排放发动机的商用车产品。2013年1月28日,被称作“建筑行业新军”的全新Acros建筑工程专用车在德国慕尼黑举行了全球首发仪式。 相似文献
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LNG燃料动力改建成柴油/LNG混合燃料或纯LNG单燃模式,通过采用LNG全部或部分替代柴油燃料,达到节省燃油和降低排放的双重目的。本文根据检验工作中遇到的问题,结合相关法规和规范的要求,叙述了LNG单燃料、LNG/柴油双燃料动力船的改建和建造过程中需要注意的问题。 相似文献
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近年来,LNG重卡正以其清洁能源的优势日益得到市场的认可,国内主流车企也纷纷上马LNG重卡迎接这一市场机遇。据联合卡车透露,经过了两年紧锣密鼓的筹备,即将推出国内首款13升LNG重卡-联合卡车K金版,加快迈出“把联合卡车打造成国内LNG重卡第一品牌”的步伐。 相似文献
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重型柴油车国IV排放标准确定将于今年7月1日正式实施,为何计划购买联合卡车K金版的用户全无车辆排放顾虑呢?作为国内首款13升LNG重卡的联合卡车K金版,早在更严格政策实施之前,就提前升级尾气排放技术,达到天然气重卡国V排放标准,成为天然气重卡践行节能减排承诺的行业先锋。近期,联合卡车K金版在山东东营预售会深受用户认可,在正式下线后广受行业关注,赢得了品质殊荣与价值认可。 相似文献
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简要介绍液化天然气(LNG)工作原理,结合我司目前在用的LNG营运客车的实际使用情况,对液化天然气(LNG)作为燃料的优缺点进行分析,提出实际使用过程中的注意事项. 相似文献
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Ingmar Andrasson 《先进运输杂志》1998,32(1):23-34
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. 相似文献
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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。 相似文献
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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. 相似文献
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Nicholas B. Taylor 《运输规划与技术》2018,41(1):37-57
ABSTRACTPredicting 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 (R2?>?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. 相似文献
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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. 相似文献
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在公路沥青混凝土路面配合比设计中,矿料配合比设计是一个重要环节。研究发现,通过使用计算机和Excel软件,在各种表格的单元格中设置相应计算公式、宏和绘图步骤,输入各种配合矿料的累计通过百分率后,通过简单的人机对话,完成各种矿料百分含量数据的输入和调整,自动生成各种图表;在质量监督中,通过现场检测混合矿料的级配,输入现场矿料、水泥混合累计通过百分率可自动判定其级配是否合格。 相似文献