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排序方式: 共有54条查询结果,搜索用时 15 毫秒
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本文分析了我国的地震灾害,阐述了近代地震灾害的特点和发展趋势,指出地震预报既是强烈的社会需求,也是全球性的科学难题,最后较为全面地介绍了我国地震预报的主要进展。 相似文献
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Lihui ZHANG Guomin CAO Yulei FEI Hong DING Mei SHENG Yongdi LIU 《Frontiers of Environmental Science & Engineering》2011,5(4):604-609
A composite membrane bioreactor (CMBR) integrating the immobilized cell technique and the membrane separation technology was developed for groundwater denitrification. The CMBR had two well mixed compartments with one filled with the nitrate- containing influent and the other with a dilute ethanol solution; the compartments were separated by the composite membrane consisting of a microporous membrane facing the influent and an immobilized cell membrane facing the ethanol solution. Nitrate and ethanol molecules diffused from the respective compartments into the immobilized cell membrane where nitrate was reduced to gaseous nitrogen by the denitrifying bacteria present there with ethanol as the carbon source. The microporous membrane was attached to one side of the immobilized cell membrane for retention of the disaggregated bacteria. Relative to the single dose of external ethanol, the two-dose supplementation produced better treatment results as evidenced by the lower concentrations of N O 3 - - N and ethanol (as measured by total organic carbon) of the effluent. The batch treatment in CMBR removed most of the nitrate in the influent and attained a stable denitrification rate of 0.1 g·m-2·h-1 for most of the 96-h cycles during the 30-cycle study. The effluent was essentially free of ethanol and nitrite nitrogen. 相似文献
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碳源循环单级生物脱氮技术研究 总被引:7,自引:0,他引:7
开发了一种列管式固定化细胞生物反应器,其特征在于硝化菌和反硝化菌被混合固定于中空的PVA凝胶管的管壁之中,PVA凝胶管平行置于圆柱形筒体内,构成一个类似于列管式换热器的生物脱氮反应器。需要处理的氨氮废水在固定化细胞管的外侧与圆柱形壳体的内侧间流动,而反硝化所需的碳源(乙醇水溶液)则在PVA凝胶管内循环。研究了列管式固定化细胞生物反应器进行单级生物脱氮的可行性和连续运行的效果,并证明了在非纯菌种的固定化细胞单级生物脱氮过程化细胞生物反应器进行单级生物脱氮的可行性和连续运行的效果,并证明了在非纯菌种的固定化细胞单级生物脱氮过程中,存在着NH^ 4→NO^-2→N2的短积生物脱氮。 相似文献
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滑坡滑动面方程多项式拟合 总被引:1,自引:0,他引:1
本文讨论了滑坡的形态特征来确定滑动面分析方法,应用数据分析方法,通过多项式对滑动面方程进行拟合,工程实践证明拟合后的滑动面方程能满足工程要求。 相似文献
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Lihui Zhang Guomin Cao Yulei Fei Hong Ding Mei Sheng Yongdi Liu 《Frontiers of Environmental Science & Engineering in China》2011,5(4):604-609
A composite membrane bioreactor (CMBR) integrating the immobilized cell technique and the membrane separation technology was
developed for groundwater denitrification. The CMBR had two well mixed compartments with one filled with the nitrate-containing
influent and the other with a dilute ethanol solution; the compartments were separated by the composite membrane consisting
of a microporous membrane facing the influent and an immobilized cell membrane facing the ethanol solution. Nitrate and ethanol
molecules diffused from the respective compartments into the immobilized cell membrane where nitrate was reduced to gaseous
nitrogen by the denitrifying bacteria present there with ethanol as the carbon source. The microporous membrane was attached
to one side of the immobilized cell membrane for retention of the disaggregated bacteria. Relative to the single dose of external
ethanol, the two-dose supplementation produced better treatment results as evidenced by the lower concentrations of NO3−-N and ethanol (as measured by total organic carbon) of the effluent. The batch treatment in CMBR removed most of the nitrate
in the influent and attained a stable denitrification rate of 0.1 g·m−2·h−1 for most of the 96-h cycles during the 30-cycle study. The effluent was essentially free of ethanol and nitrite nitrogen. 相似文献
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电力系统震后恢复过程及经济损失研究 总被引:4,自引:0,他引:4
本文通过专家咨询的方法,调查、分析、研究了我国电力系统的震后恢复过程,给出了电力系统主体部分、分布部分、服务部分震后功能损失的30%、60%和100%得到恢复的时间,计算了损失工作日数和间接经济损失,研究表明,震后恢复时间和损失工作日数均随地震烈度呈对数上升趋势,并且主体部分的震后恢复时间最长,损失工作日数最多,分布部分次之,服务部分的震后恢复时间最短,损失工作日数最少。本文还讨论了电力系统经济损失的分类和计算方法。 相似文献