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排序方式: 共有378条查询结果,搜索用时 171 毫秒
91.
Chul H. Song Mi E. Park En J. Lee Jae H. Lee Bo K. Lee Dong S. Lee Jhoon Kim Jin S. Han Kwang J. Moon Yutaka Kondo 《Atmospheric environment (Oxford, England : 1994)》2009,43(13):2168-2173
Simultaneous measurements of gaseous species and fine-mode, particulate inorganic components were performed at the University of Seoul, Seoul in Korea. In the simultaneous measurements, a certain level of nitrous acid (HONO) was observed in the gas-phase, indicating possible heterogeneous HONO production on the surface of the ambient aerosols. On the other hand, high particulate nitrite (NO2?) concentrations of 1.41(±2.26) μg/m3 were also measured, which sometimes reached 18.54 μg/m3. In contrast, low HONO-to-NO2 ratios of 0.007(±0.006) were observed in Seoul. This indicates that a significant fraction of HONO is dissolved in atmospheric aerosols. Around the Seoul site, sufficient alkalinity may have been provided to the atmospheric aerosols from the excessive presence of NH3 in the gas-phase. Due to the alkaline particulate conditions (defined in this study as a particle pH >~3.29), the HONO molecules produced at the surface of the atmospheric aerosols appeared to have been converted into particulate nitrite, thereby preventing their further participation in the atmospheric O3/NOy/HOx photochemical cycles. It was estimated that a minimum average of 65% of HONO was captured by alkaline, anthropogenic, urban particles in the Seoul measurements. 相似文献
92.
Helena Parschová Petra Šlapáková Alena Uzlová Luděk Jelínek Eva Mištová 《Environmental geochemistry and health》2010,32(4):279-282
Three different sorbents based on hydrated ferric oxide (GEH, ArsenXnp and Lewatit FO 36) were compared from the viewpoints of their column operation. Particle size distribution, pressure drop
across the column and ferric oxide content were measured. Sorption capacities under the presence of accompanying ions were
measured in batch wise and column experiments. 相似文献
93.
JIN Jian ZHAO Wei-rong XU Xin-hu HAO Zhi-wei LIU Yong HE Ping ZHOU Mi 《环境科学学报(英文版)》2006,18(3):464-467
Steel manufacturing byproducts and commercial iron powders were tested in the treatment of Ni^2+-contaminated water. Ni^2+ is a priority pollutant of some soils and groundwater. The use of zero-valent iron, which can reduce Ni^2+ to its neural form appears to be an alternative approach for the remediation of Ni^2+-contaminated sites. Our experimental data show that the removal efficiencies of Ni^2+ were 95.15% and 94.68% at a metal to solution ratio of 20 g/L for commercial iron powders and the steel manufacturing byproducts in 60 min at room temperature, respectively. The removal efficiency reached 98.20% when the metal to solution ratio was 40 g/L for commercial iron powders. Furthermore, we found that the removal efficiency was also largely affected by other factors such as the pHs of the treated water, the length of time for the metal to be in contact with the Ni^2+-contaminated water, initial concentrations of metal solutions, particle sizes and the amount of iron powders. Surprisingly, the reaction temperature appeared to have little effect on the removal efficiency. Our study opens the way to further optimize the reaction conditions of in situ remediation of Ni^2+ or other heavy metals on contaminated sites. 相似文献
94.
A bed-type filter composed of thin metal alloy fiber was closely examined with dust capturing in cold and hot runs. The investigation of an individual mechanism across the filter bed indicated that the aerated dust could be initially collected by depth filtration, and after a while, surface filtration dominated the overall dust collection. The present metal fiber bed was comparable to the conventional ceramic filters because of its good collection efficiency with low pressure drop. It also showed potential to be used as a prefilter in a diesel exhaust trapping system. 相似文献
95.
96.
用数理统计的原理,当样本容量满足检验方法要求时,用柯尔莫哥洛夫--斯米尔诺夫、皮尔逊、概率纸等法对绵阳市城区SO2监测值进行分布类型的统计检验。其结果SO2的时空分布类型为近似对数正态。用几何均数代表样本的平均值,例行监测时段的SO2测值与增加采样频率后的测值基本无差异。而用算术均数表示平均值时,均值则落在总体均值的置信区间外。故当样本分布类型确定后,样本的主要特征数应由分布类型确定。 相似文献
97.
通过利用NCEP再分析气象资料和闪电定位系统监测资料对2007年云南主要致灾雷电过程进行对比诊断分析,结果表明:尽管雷电活动和导致的雷击灾害的地域差异较大,但频繁的雷电活动是导致雷击灾害的主要原因;云南雷电活动区域与高CAPE区域具有较好的对应关系,雷电一般发生在CAPE≥200J/kg的区域内,另外上升下沉气流之间形成的稳定垂直环流、倾斜深厚上升气流以及中低层上升气流、高层下沉气流的大气垂直结构非常利于云南雷电形成和雷击灾害事件发生,雷电易发区域从低层到高层垂直速度小于-1.0hPa/s,并且对流有效位能越大、上升运动越强烈,越有利于雷电产生和雷击灾害发生。 相似文献
98.
99.
Han Xuesong Huettmann Falk Guo Yumin Mi Chunrong Wen Lijia 《Regional Environmental Change》2018,18(7):2173-2182
Regional Environmental Change - Ongoing global climate change greatly alters the distribution of species, and such impacts are even amplified on the Tibetan Plateau. The black-necked crane (Grus... 相似文献
100.
关于完善环境污染损害赔偿法律救济的思考 总被引:1,自引:0,他引:1
随着经济的飞速发展,环境污染的现象日益严重。目前我国解决环境污染损害赔偿责任纠纷的方式包括两种,即行政处理和诉讼解决。我国环境污染损害赔偿制度尚不完善。本文就完善环境污染损害赔偿法律救济提出具体建议,即修改、完善环境污染损害赔偿相关法律制度,使其适应经济和社会可持续发展的需要。 相似文献