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排序方式: 共有1208条查询结果,搜索用时 15 毫秒
371.
TiO2 supported on active carbon fiber (TiO2/ACF), an absorbable photocatalyst, is a new kind of material applied in air purification. In this paper, the influence of environmental temperature (T) and relative humidity (RH) on the gas-solid adsorption of toluene and the photocatalytic oxidation (PCO) efficiency of adsorbed toluene on TiO2/ACF were studied, and then, the purification capability of TiO2/ACF was estimated. PCO results showed that although the PCO efficiency increased under high RH and T levels, the amount of adsorption of toluene decreased. Moreover, quantitative analysis results of intermediates indicated that more environmental risk emerged when PCO of toluene was carried out at higher environmental T and RH levels because more toxic intermediates would be accumulated on the TiO2/ACF. So, it is significant to control the environmental T and RH conditions in the application of the PCO technique. T = 25°C and RH = 30% is the optimal condition for purifying toluene in our experimental system. 相似文献
372.
373.
无机盐对SO2—H2O—CaCO3气液固三相反应系统pH值的影响 总被引:11,自引:0,他引:11
研究了硫酸钠、硝酸钠和氯化钠及相应钙盐对石灰石浆液烟气脱硫条件下SO2-H2O-CaCO3气、液、固三相反应系统中pH值的影响。发现硫酸钠能明显提高系统的pH值,硝酸钠和氯化钠使pH值提高的幅度不大,而3种钙盐均使pH值降低。根据膜模型的分析结果,认为无机盐影响该反应系统pH值的主要原因是无机盐的加入改变了石灰石表面的pH值。 相似文献
374.
Taihu Lake is the third largest freshwater lake in China. Taihu Basin is one of the most densely populated and urbanized areas in this country. This area provides 15% of the GDP. Meiliang Bay is located in the north part of the Lake. It provides the municipal water source for Wuxi City. Some parts of the lake have been found to be highly polluted due to eutrophication for over a decade. Surface water (0-0.5 m) samples were collected from the Meiliang Bay by the aid of Global Position System (GPS) for positioning. Water samples were concentrated 5000 times with XAD-2 resin columns. A reverse mutation test using histidine-dependent Salmonella typhimurium strains was employed to assay the genotoxicity of the samples. The results showed that the sample from position 6 had the highest genotoxicity either in the case of activating with eucaryotic S9 system or without S9. The genotoxic effect included, at least, two different molecular mechanisms: nucleotide point substitution on DNA molecules and reading frame shifting caused by nucleotide insertion or deletion. The genotoxicity of the water body in Meiliang Bay, Taihu Lake should be kept in close monitoring. 相似文献
375.
开展城市社区暴雨内涝模拟,初步分析受影响的居民数量.以上海市普陀区金沙居委地区为案例,利用上海市暴雨经验公式计算重现期为50年、100年、500年三种不同情景下的1h降水量,以修正的SCS模型计算径流量.结合上海市排水管网系统的运行状况和实测的研究区相对高程,模拟9种不同情景下暴雨积水的淹没深度,分析不同情景下受影响的房屋分布和对居民出行的影响.随着暴雨强度的增强,排水管网系统功能的失效,积水区域由研究区中部不断扩大.在重现期为500年的情景下,在排水系统完全失效的情况下,最大淹没深度可达0.405 m,道路积水影响出行的人数达到5 970人,占研究区总人口数的87%,已经严重影响到当地居民的日常生活和出行. 相似文献
376.
四川省泥石流预报的区域临界雨量指标研究 总被引:29,自引:0,他引:29
本文在讨论四川泥石流分区的基础上,论述了区域泥石流临界雨量指标的确定方法及应用问题。并制定了四川泥石流预报的区域临界日雨量和临界小时雨强指标。 相似文献
377.
Landfill biogas is a potential alternative for fossil fuel,but the containing impurities,volatile methyl siloxanes(simplified as siloxanes),often cause serious problems in gas turbines when applied to generate electricity.In this research,a collecting and analyzing method based on solvent adsorption and purge and trap-gas chromatography-mass spectrometry was established to determine the siloxanes in biogas from a landfill in Jinan,China,and adjacent ambient samples,such as soil,air,and leachate ... 相似文献
378.
扶梯乘员坠落事故已经发生多起,如何进行相关风险的辨析并提出防范对策,是电梯从业者难以回避的课题.本文试从生产者、经营管理者之角度就此课题进行“归责”与“对策”的辨析与思考,希冀关注者有所借鉴,防范已经存在或可能发生的风险. 相似文献
379.
Wenbing Tan Dongyu Cui Xiaohui Zhang Beidou Xi 《Frontiers of Environmental Science & Engineering》2020,14(6):112
Bulk organic waste (BOW) has a large output in China. The improper disposal of BOW will not only bring serious environmental pollution, but also cause waste of biomass resources. The viewpoint proposes a region-gridding recycling management system of BOW that highlights the coordinated development of environmental, agricultural and energy elements in urban and rural areas. The viewpoint aims to drive the upstream and downstream industrial chains of BOW treatments, avoid the repeated construction of resource facilities, guide the upgrading of resource-based technologies, promote the professionalization of farmers, and thus built the high-quality modern agricultural recycling industrial park based on system management. 相似文献
380.
Environmental and Ecological Statistics - The results show that a comprehensive evaluation system consisting of natural resources, pollution response, government management, and legal involvement... 相似文献