A novel constant interfacial area cell(NCIAC),by spatially separating the agitation from liquid flow circulation of organic and aqueous two phases,was suggested to obtain detailed kinetic data for Er(Ⅲ) extraction fr...A novel constant interfacial area cell(NCIAC),by spatially separating the agitation from liquid flow circulation of organic and aqueous two phases,was suggested to obtain detailed kinetic data for Er(Ⅲ) extraction from chloride medium by 2-ethyl-hexyl-phosphonic acid mono-(2-ethylhexyl) ester(EHEHPA).Different from the traditional Lewis cell and the constant interfacial area cell with laminar flow,the concentrations of Er(Ⅲ) in organic and aqueous two phases were uniform,and the stability of the interfacial area between the two phases could be controlled effectively.Therefore,the special requirements for the design of agitators in the traditional Lewis cell and the constant interfacial area cell for minimizing the influence of diffusion resistance could be avoided.Experimental results indicated that the extraction kinetics was mainly affected by the aqueous flow rate,interfacial area between organic and aqueous two phases,and the aqueous p H values.An extraction kinetic equation was suggested based on the experimental data.展开更多
The electron density recorded onboard the DEMETER satellite was analyzed to search for possible anomalies before earthquakes both in space and time. To distinguish pre-earthquake anomalies from the other anomalies rel...The electron density recorded onboard the DEMETER satellite was analyzed to search for possible anomalies before earthquakes both in space and time. To distinguish pre-earthquake anomalies from the other anomalies related to geomagnetic activity, data were filtered using the Kp index. The analysis is based on the comparison of data recorded closely to earthquakes in space and time and past data for the same area. In analyzing data around the time and location of the Pu＇er and Wenchuan earthquakes, obvious anomalies in electron density were found close to the epicenters, and some remarkable disturbances were detected before the earthquakes occurred. The results were finally compared with those of previous works that used the same data but employed different analysis methods. Good agreement was found which suggests that these anomalies have a close relation to the earthquake preparation.展开更多
Xiong’er volcanic rocks cover an area of more than6×104 km2 along the southern margin of North China Craton.The Xiong’er group has been divided,from bottom to top,into the Dagushi,Xushan,Jidanping and
A large quantity of Premian volcanic rocks formed in Sawu＇er region of Xinjiang, China. Based on the analysis of the rare earth elements＇ （REEs） geochemical characteristics of the volcanic rocks, the correlativity...A large quantity of Premian volcanic rocks formed in Sawu＇er region of Xinjiang, China. Based on the analysis of the rare earth elements＇ （REEs） geochemical characteristics of the volcanic rocks, the correlativity of REE and major elements, and diagrams of covariant relation of REE, combined with the research results of the regional geological setting, petrology, and petrochemistry characteristics, it is inferred that the mechanism of the formation of Premian basic and intermediate volcanic rocks is mainly attributed to equilibrium partial melting, and the magmatic fractional crystallization is not significant, whereas the rock-forming processes of medium-acidic volcanic rocks is influenced by both partial melting and fractional crystallization. The REE geochemical research provided important evidence for the mechanism of magmatism of the Premian post-collision stage and the geodynamical evolution process.展开更多
数据质量评价是土地覆盖产品选择的依据和应用的前提。以云南省普洱市为研究区,采用面积相关系数、类型混淆分析、空间模式一致性分析以及混淆矩阵等方法,根据机载影像分类和亚米级影像目视判读结果,分析了该区的4种10m空间分辨率的土...数据质量评价是土地覆盖产品选择的依据和应用的前提。以云南省普洱市为研究区,采用面积相关系数、类型混淆分析、空间模式一致性分析以及混淆矩阵等方法,根据机载影像分类和亚米级影像目视判读结果,分析了该区的4种10m空间分辨率的土地覆盖产品(Pu′er LC,Esri_Land_Cover_2020_10m, ESA World Cover和Dynamic World)的精度和一致性。结果表明:1)4种土地覆盖产品的土地类型和分布格局基本一致,以林地为主,灌木与草地、耕地次之,面积相关性较高,相关系数均大于0.9;2)空间高一致性区域占普洱总面积的64.87%,以林地为主,空间一致性较低的区域内灌木与草地、林地、耕地、建设用地等土地覆盖类型交错分布;3)精度验证结果表明,Pu′er LC数据总体精度最高(88.52%),其他3个产品总体精度相差不大,在75%左右。研究可以为土地覆盖数据质量评价和使用等方面提供参考和借鉴。展开更多
基金Supported by the National Natural Science Foundation of China(51574213,51074150)the Key Project of Chinese National Programs for Fundamental Research and Development(2012CBA01203,2013CB632602)
文摘A novel constant interfacial area cell(NCIAC),by spatially separating the agitation from liquid flow circulation of organic and aqueous two phases,was suggested to obtain detailed kinetic data for Er(Ⅲ) extraction from chloride medium by 2-ethyl-hexyl-phosphonic acid mono-(2-ethylhexyl) ester(EHEHPA).Different from the traditional Lewis cell and the constant interfacial area cell with laminar flow,the concentrations of Er(Ⅲ) in organic and aqueous two phases were uniform,and the stability of the interfacial area between the two phases could be controlled effectively.Therefore,the special requirements for the design of agitators in the traditional Lewis cell and the constant interfacial area cell for minimizing the influence of diffusion resistance could be avoided.Experimental results indicated that the extraction kinetics was mainly affected by the aqueous flow rate,interfacial area between organic and aqueous two phases,and the aqueous p H values.An extraction kinetic equation was suggested based on the experimental data.
基金supported by the National Key Technology Research and Development Programme of China(No.2008BAC35B02)
文摘The electron density recorded onboard the DEMETER satellite was analyzed to search for possible anomalies before earthquakes both in space and time. To distinguish pre-earthquake anomalies from the other anomalies related to geomagnetic activity, data were filtered using the Kp index. The analysis is based on the comparison of data recorded closely to earthquakes in space and time and past data for the same area. In analyzing data around the time and location of the Pu＇er and Wenchuan earthquakes, obvious anomalies in electron density were found close to the epicenters, and some remarkable disturbances were detected before the earthquakes occurred. The results were finally compared with those of previous works that used the same data but employed different analysis methods. Good agreement was found which suggests that these anomalies have a close relation to the earthquake preparation.
基金financially supported by the National Natural Science Foundation of China(grant No.41173065)Ministry of Land and Natural Resources(grant No.201311116)
文摘Xiong’er volcanic rocks cover an area of more than6×104 km2 along the southern margin of North China Craton.The Xiong’er group has been divided,from bottom to top,into the Dagushi,Xushan,Jidanping and
基金Project supported bythe National Key Basic Science Research Project of China (2001CB409800)Anhui Provincial Excel-lent Youth Science and Technology Foundation (04045063)
文摘A large quantity of Premian volcanic rocks formed in Sawu＇er region of Xinjiang, China. Based on the analysis of the rare earth elements＇ （REEs） geochemical characteristics of the volcanic rocks, the correlativity of REE and major elements, and diagrams of covariant relation of REE, combined with the research results of the regional geological setting, petrology, and petrochemistry characteristics, it is inferred that the mechanism of the formation of Premian basic and intermediate volcanic rocks is mainly attributed to equilibrium partial melting, and the magmatic fractional crystallization is not significant, whereas the rock-forming processes of medium-acidic volcanic rocks is influenced by both partial melting and fractional crystallization. The REE geochemical research provided important evidence for the mechanism of magmatism of the Premian post-collision stage and the geodynamical evolution process.
文摘数据质量评价是土地覆盖产品选择的依据和应用的前提。以云南省普洱市为研究区,采用面积相关系数、类型混淆分析、空间模式一致性分析以及混淆矩阵等方法,根据机载影像分类和亚米级影像目视判读结果,分析了该区的4种10m空间分辨率的土地覆盖产品(Pu′er LC,Esri_Land_Cover_2020_10m, ESA World Cover和Dynamic World)的精度和一致性。结果表明:1)4种土地覆盖产品的土地类型和分布格局基本一致,以林地为主,灌木与草地、耕地次之,面积相关性较高,相关系数均大于0.9;2)空间高一致性区域占普洱总面积的64.87%,以林地为主,空间一致性较低的区域内灌木与草地、林地、耕地、建设用地等土地覆盖类型交错分布;3)精度验证结果表明,Pu′er LC数据总体精度最高(88.52%),其他3个产品总体精度相差不大,在75%左右。研究可以为土地覆盖数据质量评价和使用等方面提供参考和借鉴。
