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排序方式: 共有142条查询结果,搜索用时 171 毫秒
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Erwin W. Müller 《Die Naturwissenschaften》1970,57(5):222-230
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Chengliang Li Andreas Schffer Harry Vereecken Marc Heggen Rong Ji Erwin Klumpp 《环境科学学报(英文版)》2013,25(3):466-472
The aggregation of multi-walled carbon nanotubes (MWCNTs) in the aqueous phase not only inhibits their extensive utilization in various aspects but also dominates their environmental fate and transport.The role of surfactants at low concentration in the aggregation of MWCNTs has been studied,however the effect of perfluorinated surfactants at low concentration is uncertain.To understand this interfacial phenomenon,the influences of perfluorooctanoic acid (PFOA),and sodium dodecyl sulfate (SDS) as a control,on MWCNT aggregation in the aqueous phase were examined by the UV absorbency method.Influences of pH and cationic species on the critical coagulation concentration (CCC) value were evaluated.The CCC values were dependent on the concentration of PFOA,however a pronounced effect of SDS concentration on the CCC values was not observed.The CCC values of the MWCNTs were 51.6 mmol/L in NaCl and 0.28 mmol/L in CaCl 2 solutions,which suggested pronounced differences in the effects of Na+ and Ca2+ ions on the aggregation of the MWCNTs.The presence of both PFOA and SDS significantly decreased the CCC values of the MWCNTs in NaCl solution.The aggregation of the MWCNTs took place under acidic conditions and was not notably altered under neutral and alkaline conditions due to the electrostatic repulsion of deprotonated functional groups on the surface of the MWCNTs. 相似文献
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This study quantifies and spatially characterizes land use and land cover changes in the Segara Anakan lagoon (SAL), Java,
Indonesia, from 1987–2006. Classification of four satellite (SPOT) images from the years 1987, 1995, 2004 and 2006 and field
ground truth data from 2004 and 2005 were used for map generation. The results show major changes in the western area of the
SAL, with large area increases of rice fields, dry land agriculture, aquaculture and rural areas, and decreases in mangrove
cover, mud flat and lagoon area. In the eastern area, minor decreases in mangrove area and increase in aquaculture, rural
and industrial areas were also observed. Changes are due to the filling of the lagoon with riverine sediments derived from
the hinterland and to mangrove conversion and resources exploitation. The results of this study provide basic information
which is required for developing measures towards a sustainable management and conservation of the SAL. 相似文献
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