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71.
研制了一种新的汽车尾气净化催化剂。其贵金属以Pt,Pd为主活性组分,载体以堇青石陶瓷蜂窝体涂复天然沸石粉,经测定,催化剂净化汽车尾气的活性,热稳定性,及抗铅,中毒等性能均较好,台架试验表明,催化箱对HC和CO均有很高的净化效果,HC转化率≥85%,CO转化率≥91%,并且该催化剂具有良好的冷起动性能。 相似文献
72.
汽车修配厂含油废水处理工程分析 总被引:3,自引:0,他引:3
研究了汽车修配厂含油废水的处理技术,提出了隔油-混凝-澄清-过滤处理工艺;根据该工艺设计的汽车修配厂含油废水的处理工程;运行的实际测定结果表明,其处理后的废水,CODcr可降到35mg/L,油可降到8mg/L,SS可降到20mg/L,色度可降到10度,处理后的水可达到广州市的废水处理排放标准,并可回收再利用。 相似文献
73.
香港地区考古发现多种石器及离岛的“石壁画龙”-岩画,均属新石器时代文物。发现铜器、陶器等也不少,有些有隶书年号,为周、秦时代文物。香港自南北朝以来,与两广、福建和中原地区来往密切,遗留许多名胜古迹。 相似文献
74.
75.
综述了非调质钢的工艺性能和力学性能及在汽车上的应用.说明非调质钢具有切削加工性能良好,可实施焊接和表面处理;节约能源、简化生产工序、大幅度降低成本等优点. 相似文献
76.
介绍了燃料电池的结构,特点和燃料电池动力汽车的发展概况;通过比较,阐述了燃料电池汽车的环境意义。 相似文献
77.
汽车尾气颗粒物对动物肺泡巨噬细胞的免疫毒性及比较 总被引:10,自引:0,他引:10
研究汽车尾气颗粒物气管染毒后对大鼠肺泡巨噬细胞免疫功能的影响,结果是动物肺泡巨噬细胞Fc受体表达、AM抗肿瘤细胞毒作用、抗体介导细胞毒作用受到抑制,具有明显的剂量效应关系;总体比较,汽油车尾气颗粒物对AM免疫功能影响较柴油车严重。 相似文献
78.
Inconsistent data presently available on the platinum emission rate of cars in Germany equipped with catalytic converters
are evaluated. Automobile sources of Pt other than autocatalysts are quantified and found to be 1–6 orders of magnitudes lower
than the Pt emissions attributed to catalytic converters. A transfer of emission rates derived from test stand experiments
to more realistic street conditions reaches 0.8 μg Pt/km. In this manner, data from test stand experiments and from environmental
investigations meet in the range of 0.5–0.8 μg Pt/km. 相似文献
79.
Little is known about the relationship between multi-modal transportation environments and aspects of sustainable urban development, such as reduced income inequality and affordable housing. This study, adapted from Molotch and Appelbaum's inter-city differential method, studied 148 semi-isolated mid-size cities. Using U.S. Census data from 2013, we found that increased diversity in commute modality is associated with less income inequality between white and African-American households, as well as between men and women. Commute mode diversity is also associated with higher earnings for white women and African-American men. Our study also shows that cities with more commuter mode diversity are associated with higher home property values and affordable rental markets compared to automobile dependent cities. These results undercut the notion that increasing automobile ownership is a reasonable policy response to urban poverty, and suggest that sustainable transportation policy can produce positive economic gains for cities. This work adds to the growing literature identifying fundamental differences between multimodal and automobile dependent cities. 相似文献
80.
Characteristic levels of heavy metals in soil profiles of automobile mechanic waste dumps in Nigeria
The characteristic levels of heavy metals (Cd, Cr, Cu, Pb, Ni and Zn) of soil profiles of automobile mechanic waste dumps
were studied. The concentration of heavy metals decreased with the depth of the profile and lateral distance from the dumpsites.
The levels found in this study exceeded background concentrations and limits for agricultural and residential purposes. The
distribution pattern of heavy metals in the soil profiles were in the following order Pb > Zn > Cu > Cd > Ni > Cr. The mechanic
waste dumps represent potential sources of heavy metal pollution to environment. The elevated levels of heavy metals in these
soil profiles constitute a serious threat to both surface and groundwater. 相似文献