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Extraction Kinetics of Lanthanum with Purified Cyanex 923 from Nitrate Medium 被引量:1
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作者 TongHui LiDe-qian +1 位作者 WangYi-ge LeiJia-heng 《Wuhan University Journal of Natural Sciences》 CAS 2003年第03A期871-874,共4页
Solvent extraction kinetics of lanthanum with purified Cyanex 923 in heptane from nitrate medium was investigated by using a constant interfacial cell with laminar flow at 303 K. The effects of stirring speed, tempera... Solvent extraction kinetics of lanthanum with purified Cyanex 923 in heptane from nitrate medium was investigated by using a constant interfacial cell with laminar flow at 303 K. The effects of stirring speed, temperature and specific interface on the extraction rate were studied. The experimental results showed that the extraction apparent activation energy was 32.0 kJ\5mol -1 and the extraction process was controlled by both chemical reaction and diffusion. The extraction rates were measured at different chemical compositions by varying ionic strength, pH value and the concentration of purified Cyanex 923. The initial extraction rate equation was obtained. 展开更多
关键词 LANTHANUM Cyanex 923 solvent extraction kinetics
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Fermi Resonances and Vibrational Spectrum of a Polyatomic Molecule XY4: an Algebraic Approach
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作者 WANMing-Fang CHENJing-Hua HOUXi-Wen 《Communications in Theoretical Physics》 SCIE CAS CSCD 2005年第5期891-894,共4页
A U(2) algebraic model is introduced for the spectrum of a molecule XY4, where the interactions between the stretch and bend modes are described by Td symmetric Fermi resonance terms. The presented algebraic model in ... A U(2) algebraic model is introduced for the spectrum of a molecule XY4, where the interactions between the stretch and bend modes are described by Td symmetric Fermi resonance terms. The presented algebraic model in a limit corresponds to another model in recent literature. The vibrational spectrum of methane (CH4) measured recently with modern spectroscopy techniques is employed to test those models. The obtained standard deviation between the observed and the calculated vibrational energy levels in the algebraic model is smaller than that in the corresponding model. 展开更多
关键词 vibrational analysis algebraic method
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Extreme events and impact assessment: social and economic impacts of drought in Zambia
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作者 SakalaEnock SumanJain 《宝鸡文理学院学报(自然科学版)》 CAS 2013年第1期51-60,共10页
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