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141.
Guowen Song Patirop Chitrphiromsri Dan Ding 《International journal of occupational safety and ergonomics》2008,14(1):89-106
A numerical model of heat and moisture transport in thermal protective clothing during exposure to a flash fire was introduced. The model was developed with the assumption that textiles are treated as porous media. The numerical model predictions were compared with experimental data from different fabric systems and configurations. Additionally, with the introduction of a skin model, the parameters that affect the performance of thermal protective clothing were investigated. 相似文献
142.
城市生活垃圾生命周期管理 总被引:20,自引:0,他引:20
生命周期评价是一种全面的环境管理工具,具有潜在的发展前景。0它通过对产品,产品系统,工艺活动整个生命周期的环境影响环境改善的机会进行评价。根据国际环境毒理与化学学会1993年和ISO14000环境管理体系中关于生命周期评价的技术框架,本文应生命周期评价在城市生产垃圾管理系统中的作用及管理系统的清单分析,影响评价和改善评价进行研究。 相似文献
143.
2009—2010年冬季和夏季在重庆市某代表性城区对大气中苯系物进行观测,并应用苯与甲苯特征比值(B/T)和因子分析法对苯系物来源进行了分析。结果表明,2种源分析方法具有较好的一致性,涂料及溶剂的生产与使用以及机动车尾气和油品使用是该研究区域苯系物的主要来源,贡献率分别为59.3%和16.2%。不同功能区、不同季节,苯系物来源构成有所差异。除受汽车尾气影响外,夏季受涂料、溶剂等生产使用的影响也较大,尤其是投诉集中点位、混合区和工业区;冬季,投诉集中点位主要受涂料、溶剂等生产使用等影响,其他点位可能还受到燃烧源的影响。 相似文献
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Yanguo Teng Dan Feng Liuting Song Jinsheng Wang Jian Li 《Environmental monitoring and assessment》2013,185(11):9559-9569
In order to investigate the distribution of the total petroleum hydrocarbons (TPH) in groundwater and soil, a total of 71 groundwater samples (26 unconfined groundwater samples, 37 confined groundwater samples, and 8 deeper confined groundwater samples) and 80 soil samples were collected in the Songyuan oilfield, Northeast China, and the vertical variation and spatial variability of TPH in groundwater and soil were assessed. For the groundwater from the unconfined aquifer, petroleum hydrocarbons were not detected in three samples, and for the other 23 samples, concentrations were in the range 0.01–1.74 mg/l. In the groundwater from the confined aquifer, petroleum hydrocarbons were not detected in two samples, and in the other 35 samples, the concentrations were 0.04–0.82 mg/l. The TPH concentration in unconfined aquifer may be influenced by polluted surface water and polluted soil; for confined aquifer, the injection wells leakage and left open hole wells may be mainly responsible for the pollution. For soils, the concentrations of TPH varied with sampling depth and were 0–15 cm (average concentration, 0.63 mg/g), >40–55 cm (average concentration, 0.36 mg/g), >100–115 cm (average concentration, 0.29 mg/g), and >500–515 cm (average concentration, 0.26 mg/g). The results showed that oil spillage and losses were possibly the main sources of TPH in soil. The consequences concluded here suggested that counter measures such as remediation and long-term monitoring should be commenced in the near future, and effective measures should be taken to assure that the oilfields area would not be a threat to human health. 相似文献
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148.
厦门的年耗煤量已突破 1 50万吨 ,煤渣与粉煤灰的出路是政府与公众所关注的问题。 1 986年与 1 996年相隔 1 0年的两次放射性水平监测与研究相互印证表明 ,厦门以煤渣砖为建材的建筑物 ,放射性水平低于砖混、砖木、泥木、花岗岩等类的建筑物。厦门煤渣与粉煤灰的核素含量 ,均低于《建筑材料用工业废渣放射性物质限制标准》,从而为厦门煤渣与粉煤灰的开发与推广应用提供了科学依据 ,指出了光明前景 相似文献
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Jerry A. Bullin Dan Wilkerson 《Journal of the Air & Waste Management Association (1995)》2013,63(6):669-672
Data on the effect of several combustion modifications on the formation of nitrogen oxides and on boiler efficiency were acquired and analyzed for a 110 MW gas fired utility boiler. The results from the study showed that decreasing the oxygen in the flue gas from 2.2% to 0.6% reduced the NOx formation by 33% and also gave better boiler efficiencies. Flue gas recirculation through the bottom of the firebox was found to be ineffective. Staged combustion was found to reduce the NOx emissions by as much as 55 % while decreasing the efficiency by about 5%. Adjustment of the burner air registers reduced the NOx formation by about 20 ppm. The lowest NOx emissions of 42 ppm (at about 3% O2) in the stack was obtained for air only to one top burner and 0.5% oxygen in the flue gas. 相似文献