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排序方式: 共有2046条查询结果,搜索用时 31 毫秒
961.
Geostatistical analysis and kriging of Hexachlorocyclohexane residues in topsoil from Tianjin, China 总被引:5,自引:0,他引:5
Li BG Cao J Liu WX Shen WR Wang XJ Tao S 《Environmental pollution (Barking, Essex : 1987)》2006,142(3):567-575
A previously published data set of HCH isomer concentrations in topsoil samples from Tianjin, China, was subjected to geospatial analysis. Semivariograms were calculated and modeled using geostatistical techniques. Parameters of semivariogram models were analyzed and compared for four HCH isomers. Two-dimensional ordinary block kriging was applied to HCH isomers data set for mapping purposes. Dot maps and gray-scaled raster maps of HCH concentrations were presented based on kriging results. The appropriateness of the kriging procedure for mapping purposes was evaluated based on the kriging errors and kriging variances. It was found that ordinary block kriging can be applied to interpolate HCH concentrations in Tianjin topsoil with acceptable accuracy for mapping purposes. 相似文献
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964.
海带对镉的吸附动力学与热力学研究 总被引:7,自引:1,他引:6
采用批量平衡法研究了海带对镉的吸附的动力学与热力学,并采用Lagrange假一级动力学方程、假二级动力学方程、Langmuir等温线方程、Freundlich等温线方程以及Dubimim-Radushkevich等温线方程对实验数据进行了拟合.结果表明,在4种温度下海带对镉的吸附率均随吸附反应时间增加而增大,在60 min时达到最大,此后基本保持不变,随着温度由20℃升高至50℃,其最大吸附率呈下降趋势,由90.2%降至77.5%;海带对镉的吸附动力学符合Lagrange假二级动力学方程;海带对镉的吸附热力学符合Langmuir等温线方程和Dubimim-Radushkevich等温线方程,表明吸附主要发生在海带表面的活性区位,属于单分子层吸附,其吸附平均活化自由能E为11.4 kJ/mol,表明该吸附过程为化学吸附,在4种温度下吉布斯自由能变化量△AG°均为负值,吸附焓变△H°也为负值,表明海带对镉的吸附为放热反应,能自发进行. 相似文献
965.
966.
Jian-Ping Guo Xiao-Ye Zhang Hui-Zheng Che Sun-Ling Gong Xingqin An Chun-Xiang Cao Jie Guang Hao Zhang Ya-Qiang Wang Xiao-Chun Zhang Min Xue Xiao-Wen Li 《Atmospheric environment (Oxford, England : 1994)》2009,43(37):5876-5886
Using one year of Aerosol Optical Depth (AOD) derived from Moderate Resolution Imaging Spectroradiometer (MODIS) on the Terra satellite and particular matter (PM) contents measured at eleven sites located mostly in the eastern China in 2007, the relationship between columnar AOD and hourly and daily average (DA) PM were established. The peak AOD observed from MODIS was generally consistent with the surface PM measurements in eastern China, where Zhengzhou had the maximum annual mean PM10 of 182.1 μg m?3, while Longfengshan had the minimum annual mean of 38.1 μg m?3. Ground level observations indicated that PM concentration varies widely across different regions, which was mainly due to the difference in weather conditions and anthropogenic emissions. The coarse particles accounted for the main air pollution in Zhengzhou and Benxi whiles the fine particles, however, were the main constituents in other sites. Results showed that MODIS AOD (averaged over the box of 5 × 5 and 3 × 3 pixels) had a better positive correlation with the coincident hourly average (HA) PM concentration than with DA due to diurnal variation in PM mass measurements. After correcting AOD for relative humidity (RH), the correlation did not improve significantly, suggesting that the RH was not the main factor affecting the correlation of PM with AOD. The statistical regression analysis between MODIS AOD and PM mass suggested that the satellite-derived AOD is a useful tool for mapping PM distribution over large spatial domains. 相似文献
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968.
污染因子相关分析判定地下水污染源 总被引:3,自引:2,他引:1
把相关分析用于地下水污染源的判定,在安阳市劳教所一带地下水污染事故中成功地判定了污染源 相似文献
969.
对煤矿安全管理的特点进行了分析,在此基础上提出了煤矿安全目标管理的方法,以及煤矿安全目标管理应用软件。 相似文献
970.
Huang Q Wu J Kong Y Liu M Cao S 《Journal of environmental science and health. Part. B》2007,42(3):305-310
The photodynamic decomposition of two new insect-growth inhibitors (IGRs), 2-tert-butyl-5-[5'-aryl-2'-(1',3',4'-oxadiazolyl)methoxy]-3(2H)-pyridazinones (OPB) and its 4-chloro substituted derivative (OPC), and effect of surfactants on persistence of their bioactivity were taken into investigation. Both chemicals were significantly induced to photolysis by ultraviolet light at 365 nm wavelength and their inhibitory activities against Pseudaletia separata larvae decreased with the increasing irradiation time. However, irradiation at 254 nm wavelength didn't cause their photodegradation. Triton X-100 and Succinic-sulfonie acidic sodium but not Tween 60 possessed strong capability to slow down the decomposition and obviously prolonged the half life of OPC in laboratory and field whilst effects of the three surfactants almost did not preserve the inhibitory activity of OPB. Data suggested that electron-withdrawing halogen (-Cl) on the pi electron system in planar benzene-oxadialyl structures might reduce the efficiency of OPC on ultraviolet (UV) photoabsorption, and its hydrophobic interaction with the surfactants might be beneficial for forming stable micellar solubilization, thus sustaining the chemical's bioactivity. 相似文献