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柴油机的排放控制包括减少柴油机燃烧时有害成分的生成和对排气进行后处理.介绍了合理组织燃烧、改善燃料品质、进行废气再循环等减少柴油机燃烧时有害成分的措施;介绍了催化转换器、颗粒过滤器等排气后处理措施. 相似文献
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柴油机的有害排放物是造成大气污染的一个主要来源,通过提高柴油品质,减少润滑的消耗,改善柴油机的燃烧过程和排气后处理等措施,可以大大降低柴油机的有害排放物,达到低排放标准,提高环境质量. 相似文献
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柴油机具有较高的热效率、较好的动力性和经济性,在城市客车上的应用越来越广泛。但使用一定时间后往往会产生排气冒黑烟的现象,不但污染大气环境,还降低了发动机功率,增加了柴油消耗量。分析柴油车排黑烟原因,并采取有效措施加以解决,使柴油客车更好地为市民出行服务。 相似文献
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文章介绍了汽车排气污染物的危害以及我国汽车排气污染物控制法规的实施进程,同时总结了柴油发动机的应用特点和在排放领域存在的问题,对柴油发动机排气污染物的种类、生成机理进行阐述,并总结了现阶段调高柴油发动机排放水平、降低柴油发动机排放污染物生成的有效途径. 相似文献
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控制柴油机排放的技术分析 总被引:1,自引:0,他引:1
文章介绍了柴油机排放中的若干种措施。在控制柴油机排放的措施中,主要从机内处理和机外净化两个方面分别阐述了对柴油机主要污染物氮氧化物和微粒的处理方法。 相似文献
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2012年3月27日,2012亚洲柴油车排放论坛暨添蓝论坛在北京王府半岛酒店举行,与会代表商讨柴油车减排和节能话题。2012亚洲柴油车排放暨添蓝论坛将提供道路及非道路柴油机动车和柴油发动机制造商中国最新的法规以及技术发展讯息。参会代表共同讨论延迟到明年的国四标准执行及油品挑战、北京市国五重型柴油机的地方排放标准和执行、以及可能的国六标准要件等热点话题。亚洲柴油车排放论坛暨添蓝论坛已举办五届,论坛持续讨论中国排放情况及发展,并聚集国外专家和制造厂商为国内排放论坛出谋划策。 相似文献
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"超限超载"的产生与发展,蕴藏着深层的内在运作机理,包含着复杂的经济社会原因.其中道路货物运输价格体系的长期扭曲失衡与成本结构的有欠合理是一个不容忽视的根本原因.为此,公路所开展了货运市场运价与成本"治超"专项研究,先后历时一个多月,行程数千公里,深入7省市运输一线,对21家典型企业和个体业户的23辆货车、24条线路进行了跟踪调查,获取了大量的第一手资料与原始数据,并对此进行了解析. 相似文献
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Ngila Mwase† 《运输评论》2013,33(3):191-206
Zambia has attempted to reduce her excessive transport dependency on her traditional transport routes via South Africa and the former Portugese colonies. The costly construction of the Tanzania‐Zambia Railway (TAZARA) was part of this diversification strategy. This article examines the nature, extent and direction of Zambian traffic, including its historical evolution. It explores further the place of TAZARA among the various routes to Mozambican, Angolan and South African ports, and the ensuing actual and potential competition. Future traffic patterns will be influenced not only by the direct and service‐oriented costs of the different lines, but also by the region's volatile and uncertain political climate. 相似文献
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Robert E. Paaswell 《Transportation》1973,2(4):351-371
An examination of current population statistics shows that in the U.S. more than half of the population is without immediate access to a car, and in the U.K. more than three-fifths of the population is without access to a car. This phenomenon has been accentuated by national investment in both countries in major highway programs. The term carless refers to more than just households that own no cars. It extends, in households with cars to those without licenses (old and young), the handicapped, and even the licensed drivers who have no access to the family car when it is in use elsewhere (e.g. at work). The most severely effected are those in urban areas and especially the urban poor. Transportation expenses are limited for the poor when other family expenditures (food, shelter) take a high priority. Once the work trip has been satisfied, money for other trips, for the poor, is not always available. One solution to cost-free travel is pedestrianism (walking), but this too is difficult in urban areas where the pedestrian has been overlooked in favor of the car. Solutions to problems of the carless include dial-a-ride, better public transit, and better design of urban form. 相似文献
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针对海中箱梁现浇施工中的工程量大、工期紧迫、悬臂法施工不能满足工期要求和施工难度大等问题,文章结合青岛海湾大桥箱梁现浇施工实践,介绍以钢管桩支撑作为承载基础,采用贝雷梁与碗扣式支架相结合的支架,成功地解决现浇箱梁施工难题的方法。 相似文献
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章简略地分析了单线循环固定抱索器索道抱索器移位及索道频繁开停车对索道运载索、驱动机减速器、制动器等部件使用寿命的影响,并提出了相应的减轻这些影响的技术对策。 相似文献