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111.
112.
Chlorobenzenes in waterweeds from the Xijiang River (Guangdong section) of the Pearl River 总被引:3,自引:0,他引:3
The Xijiang River is the major source of water for about 4.5 millions of urban population and 28.7 millions of rural population. The water quality is very important for the health of the rural population. The concentration and distribution of chlorobenzenes (CBs) in both water and waterweeds collected from 4 stations in the Xijiang River (Gangdong section) of the Pearl River in April and November were determined. The result showed that nearly every congener of CBs was detected. The total contents of CBs (∑CBs) in the river water ranged from 111.1 to 360.0 ng/L in April and from 151.9 to 481.7 ng/L in November, respectively. The pollution level of CBs in the water in April was higher than that in November. The contents of ∑ CBs in waterweeds ranged from 13.53×102 μg/g to 38.27×102μg/g dry weight (dw). There was no significant difference between April and November in waterweeds. The distribution of CBs in roots, caulis, and leaves of Vallisneria spiralis L. showed different patterns. The leaves mainly contained low-molecular-weight CBs(DCBs), whereas the roots accumulated more PCBs and HCBs. The average lgBCFlip (bioconcentration factor) of CBs ranged from 0.64 to 3.57 in the waterweeds. The spatial distribution character of CBs in the Xijiang River was: Fengkai County < Yunan County <Yun'an County < Gaoyao County according to the ∑CBs, and the pollution deteriorated from the upstream to the downstream of the Xijiang River. Further analysis demonstrated that the discharge of waste containing CBs may be the main source of CBs pollution in the Xijiang River. 相似文献
113.
研究Pb-Cd复合污染对5种树木叶片的生理伤害和La-Gly-VB6对Pb-Cd污染胁迫的缓解作用。实验结果表明,La-Gly-VB6能明显减轻Pb-Cd污染造成的植物叶片叶绿素含量下降、质膜透性增加,过氧化氢酶活性改变和Pb富集量上升。说明La-Gly-VB6对Pb-Cd污染胁迫具有一定的防护作用。 相似文献
114.
本文详细分析了高职院校学生中非正式群体产生的心理原因、类型、特征和功能,提出了切实可行的教育对策. 相似文献
115.
金龙 《中国环境管理干部学院学报》2007,17(4):54-57
渔业环境权是渔业权人在得到许可的渔业水域从事养殖、捕捞等生产活动时所拥有的保护渔业水域环境的权利。根据物权理论,渔业环境权是一种基于国家对渔业水域的所有权上派生的用益物权,是《物权法》中养殖权和捕捞权的构成要件,它同养殖或捕捞水生动(植)物的所有权、对得到许可的水域(水体)的占有或使用权一起,构成完整的养殖权或捕捞权。这就是现行法律制度没有规定独立的渔业环境权的原因。 相似文献
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污水处理行业的技术经济特性决定了污水处理行业政府规制的必要性.明确的规制目标是建立污水处理行业政府规制体制的基本前提.在详细分析了污水行业技术经济特性的基础上,提出了当前污水处理行业政府规制目标,并结合当前污水处理行业政府规制现状,做了相关政策的分析研究,为政府监管规制建设做了有益的探索. 相似文献
118.
火灾环境下具有弹性支座钢构件的稳定性能 总被引:5,自引:0,他引:5
根据弹性稳定理论原理研究了具有弹性支座钢结构构件在火灾环境下的静力特性问题 ,导出了高温下钢构件的静力稳定临界荷载和长度计算式 ,并讨论了温度、杆件的侧向弹簧刚度、杆长、保护层厚度等因素对杆件静力稳定临界荷载和长度的影响 ,分析表明 ,杆件的侧向弹簧刚度、杆长、保护层厚度对杆件的稳定承载力影响较大 ,并探讨了在实际工程中如何减小结构失稳的问题。 相似文献
119.
The purpose of this research was to identify and analyse patterns of economic and social adaptation among river-bank erosion-induced displacees in Bangladesh. It was hypothesised that the role of social demographic and socio-economic variables in determining the coping ability and recovery of the river-bank erosion-induced displacees is quite significant. The findings of the research reveal that displacees experience substantial socio-economic impoverishment and marginalisation as a consequence of involuntary migration. This in part is a socially constructed process, reflecting inequitable access to land and other resources. Vulnerability to disasters is further heightened by a number of identifiable social and demographic factors including gender, education and age, although extreme poverty and marginalisation create complexity to isolate the relative influence of these variables. The need to integrate hazard analysis and mitigation with the broader economic and social context is discussed. It is argued that the capacity of people to respond to environmental threats is a function of not only the physical forces which affect them, but also of underlying economic and social relationships which increase human vulnerability to risk. Hazard analysis and mitigation can be more effective when it takes into account such social and demographic and socio-economic dimensions of disasters. 相似文献
120.