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91.
This paper studies the impact of speed limits on local air pollution using a series of date-specific speed limit reductions in Oslo over the 2004–2011 period. We find that lowering the speed limit from 80 to 60 km/h reduces travel speed by 5.8 km/h. However, we find no evidence of reduced air pollution as measured next to the treated roads. Our estimates suggest an annual time loss of the speed limit reductions of 66 USD per affected vehicle. Our findings imply that policy makers need to consider other actions than speed limit reductions to improve local air quality. 相似文献
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舰载直升机在舰艇编队对空预警中的使用研究 总被引:7,自引:0,他引:7
结合舰艇编队对空预警中存在的问题,指出了使用舰载直升机对空预警的必要性和可行性,论述了舰载直升机用于编队对空预警的优点以及配置方法,最后讨论了使用舰载直升机对空预警的几点注意事项。 相似文献
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车用空气压缩机性能试验台是用来测试车用空气同有关性能的试验检测设备,它由动力测量系统、气体测量、润滑、水冷却、风冷却、窜油量测试和专项测试等7个系统组成,详细介绍了各系统的结构组成、工作原理及测试项目。给出了各测试项目的测试范围、车用空气压缩机性能试验台系统图及回油量测试器图。 相似文献
97.
安全气囊(SRS)的发明始于1958年,其后普遍应用于飞机上的安全防护。80年代后期,人们发现这种安全气囊与安全带配合使用对汽车乘员确实起到安全防护作用,90年代末安全气囊已被广泛应用在汽车上。在美国还规定,从1995年10月以后生产的汽车都必须安装安全气囊。 安全气囊的防护原理是,当汽车发生严重碰撞时,安全气囊即应自动打开,迅速地隔离在人与相对的物体之间。一方面起到了隔离作用,使人体的头部和胸部不会直接撞击在相对的物体上;另一方面可以吸收人体的惯性力,即吸收其能量,起到缓冲的作用,从而大大减少… 相似文献
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A New Experimental Rig of Testing Flow Boiling Heat Transfer of Refrigerant and Lubricant Mixture 总被引:8,自引:0,他引:8
This paper proposed a new experimental rig of testing flow boiling heat transfer of refrigerant and lubricant oil mixture. The quantity of oil in the test section can be controlled and regulated conveniently and accurately by connecting separate lubricant oil circuit with test section in parallel. It was built up by retrofitting a multiple air-conditioner and installing three oil-separators in serials at the compressor outlet. And so the lubricant oil in the discharged refrigerant gas of compressor can be removed completely. The refrigerant flow rate through test section can be bypassed by the by-path circuit of indoor unit. This experimental rig has advantages such as on-line and continuous oil injection, short time of obtaining stability, flexible operation, simple control, which lead to high efficiency in the research of flow boiling heat transfer of refrigerant and lubricant oil mixture. 相似文献
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Air pollution and road traffic noise are considered to be the two most important nuisances that could negatively affect the quality of life. A prolonged exposure to high concentrations of these pollutants could conduct to various health problems. Studies in environmental equity have often considered these nuisances individually whenever it comes from the same source. The main objective of this paper is to determine if the 15 years of age, those aged 65 and over, visible minorities and low income individuals located in a portion of the Island of Montreal are overrepresented in city blocks characterized by having among the highest levels of transportation-related air pollutants (i.e., ambient concentrations of NO2 and road traffic noise in decibels (dB(A)). The results show that low-income individuals and, to a lesser extent, visible minorities, are significantly overrepresented in city blocks characterized by the higher levels of NO2 and road traffic noise in dB(A). Multinomial logistic regression analysis confirms these results, and also shows that young people under 15 years are under-represented in the most polluted areas. However, contrary to the previous bivariate results, people aged 65 and over are negatively and significantly associated with the likelihood of their living in a city block located in an advantaged area after controlling for the independent effects of the other explanatory variables. Moreover, visible minorities are significantly overrepresented in advantaged areas. Considering the observed results, some solutions are identified to reduce road traffic noise and air pollution in the city blocks localized near major traffic arteries. 相似文献