排序方式: 共有48条查询结果,搜索用时 13 毫秒
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我国清洁汽车的发展及对策 总被引:1,自引:0,他引:1
简述了我国清洁汽车的发展概况和存在的主要问题,重点提出我国清洁汽车“应加快燃油汽车先进排放控制技术的研发与应用;代用燃料汽车的发展重点应继续放在单一燃料燃气汽车上;混合动力汽车应加快发展,但自主开发应谨慎”等对策及建议。 相似文献
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刘江波 《武汉船舶职业技术学院学报》2006,5(6):11-13,16
针对沥青的特性,本文对沥青装卸系统进行了分析,在沥青泵组、装卸管系、伴热管系等方面提出了几种可行的设计方案,并对这些方案作了比较,指出了设计中应注意的一些问题。 相似文献
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一般Clean环的扩张 总被引:2,自引:0,他引:2
姜侠 《兰州交通大学学报》2006,25(3):149-150
有单位元的结合环R称为clean环,如果R中的每个元素都可以写成一个幂等元与一个单位的和的形式.W.K.Nicholson,Y.Zhou[1]给出了一般clean环的定义.在此基础上讨论了一般clean环的几个扩张性质,得到如下结论:1)一般环I是一般clean环当且仅当I的形式幂级数环是一般clean环当且仅当I的斜幂级数环是一般clean环.2)若I是一般clean环,则对任意n≥1,均有I[x]/是一般clean环. 相似文献
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William M. Lyons 《Transportation》1995,22(3):217-240
In combination, the Intermodal Surface Transportation Efficiency Act of 1991 (ISTEA) and the Clean Air Act Amendments of 1990 (CAAA) are innovative and aggressive efforts to move US cities toward integrated transportation and air quality planning. Under these complementary laws, air quality has become a major national transportation goal. In areas with serious air pollution, air quality will be a major consideration in determining the future shape of urban transportation.This paper considers how the CAAA and ISTEA combine to provide an innovative national policy approach of interest to countries seeking to encourage sustainable development in urban centers. The CAAA mandates measurable and enforceable air quality targets. Nation-wide standards are set for acceptable levels of carbon monoxide, ground level ozone, and small particulates. ISTEA includes directions for transportation planners and decision-makers to follow to reach air quality and other goals — transportation planning must emphasize system efficiency, and for cities with severe air pollution, transportation projects are expected to contribute to cleaner air. Each urban area has flexibility in how it applies this framework to reflect its priorities and solve its problems. Strict federal sanctions provide incentives for compliance with both laws.Enactment of these laws has produced a period of transition and uncertainty as well as of challenge and opportunity for planners and elected officials. The next several years, the US will provide one national laboratory and over 100 different urban laboratories for innovative approaches to integrate transportation and environmental policies to resolve major urban problems.Abbreviations CAAA
Clean Air Act Amendments of 1990
- CO
Carbon monoxide
- ECO
Employee Commute Option
- EPA
US Environmental Protection Agency
- HC
Transportation hydrocarbons
- I/M
Inspections and maintenance program
- ISTEA
Intermodal Surface Transportation Efficiency Act of 1991
- MPO
Metropolitan planning organizations
- NOx
Nitrogen oxides
- PPM
Parts per million
- PM10
Small particulate matter
- SIP
State Implementation Plan
- TIP
Transportation Improvement Program
- TCM
Transportation control measures
- VMT
Vehicle miles traveled 相似文献
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针对景区湖泊、城市内河等景观水域的漂浮垃圾清理工作量大及小型水面快速自动清污设备短缺的现状,从实用性的角度出发,设计开发了一种基于自感控一体的多功能绿色清漂船。提出了整体设计方案,完成了结构设计与功能开发,利用Fluent等仿真软件进行了动力性能分析,得到了清漂船进行正常清漂作业的性能指标。并通过制作样机和下水实验,验证了所设计清漂船的控制及功能实现,从而为实船应用提供依据。 相似文献
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随着IMO 2020排放要求的出台执行,以及人们对环境问题的关注度越来越高,对环境的保护意识增强,船舶污染改善也成为热门话题。而使船舶产生环境污染的动力能源首当其冲成为需要改善的问题之一。文章介绍了几种目前应用比较多的清洁能源及其主要特点优势。 相似文献
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在“双碳”战略背景下,对城市轨道交通供电系统的低碳节能技术发展方向进行综合论述,给出未来城
市轨道交通供电系统低碳节能技术发展方向的合理建议。首先对目前清洁能源和再生能量利用技术在轨道交通中
的应用情况进行总结,根据已投运线路实测数据,分析光伏发电和再生制动能量利用对节能降碳的作用;针对不
同牵引制式的特点,分别提出基于电力电子技术的新一代城市轨道交通绿色柔性供电系统架构,一方面充分消纳清
洁能源,另一方面通过双向变流器、同相供电等技术提高能量利用率,改善供电质量,最终达到节能降碳的目的。 相似文献