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| 1 | Effect of temperature on the sorption and desorption of perfluorooctane sulfonate on humic acid显示文摘Sorption and desorption of perfluorooctane sulfonate (PFOS) on humic acid at different temperatures were studied. It was found that the sorption process could be modeled with power kinetic equation very well, suggesting that diflusion predominated the sorption of PFOS on the humic acid. The sorption capacity was doubled when the temperature increased from 5 to 35°C, and thermodynamics parameters △G0 was calculated to be -7.11 to -5.04 kJ/mol, △H0 was 14.2 kJ/mol, and △S 0 was 69.5 J/(mol·K), indicating that the sorption was a spontaneous, endothermic, and entropy driven process. Desorption hysteresis occurred at all studied temperatures which suggested that humic acid may be an important sink of PFOS in the environment. | Chengxia Jia, Chun You, Gang Pan State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China. | 2010 | Journal of Environmental Sciences2010，22，3： | 10 |
| 2 | The spreading frontiers of avian-human influenza described by the free boundary显示文摘In this paper,a reaction-diffusion system is proposed to investigate avian-human influenza.Two free boundaries are introduced to describe the spreading frontiers of the avian influenza.The basic reproduction numbers rF0(t)and RF0(t)are defined for the bird with the avian influenza and for the human with the mutant avian influenza of the free boundary problem,respectively.Properties of these two time-dependent basic reproduction numbers are obtained.Sufficient conditions both for spreading and for vanishing of the avian influenza are given.It is shown that if rF0(0)<1 and the initial number of the infected birds is small,the avian influenza vanishes in the bird world.Furthermore,if rF0(0)<1 and RF0(0)<1,the avian influenza vanishes in the bird and human worlds.In the case that rF0(0)<1 and RF0(0)>1,spreading of the mutant avian influenza in the human world is possible.It is also shown that if rF0(t0)>1 for any t0>0,the avian influenza spreads in the bird world. | LEI ChengXia KIM KwangIk LIN ZhiGui | 2014 | Science China Mathematics2014，57，5： | 5 |
| 3 | Excess polonium-210 in the coastal atmosphere originating from marine biogenic material显示文摘The depositional fluxes of atmospheric polonium-210 were measured at one site in Xiamen from August 2001 to March 2002. With predominant marine air mass, the depositional fluxes of atmospheric polonium-210 ranged from 0.01 to 0.09 Bq/(m 2 ·d), with an average of 0.04 Bq/(m 2 ·d). The seasonal pattern showed elevated polonium-210 fluxes in summer and autumn rather than in winter. Atmospheric depositional fluxes of polonium-210 showed a good correlation with beryllium-7 (r 2 =0.85) and lead-210 fluxes (r 2 =0.71), indicating their similar removal mechanism from atmosphere. The relationship between the polonium-210 depositional fluxes and the precipitation amount demonstrated that the precipitation dominates the polonium-210 removal from the atmosphere. The observed high activity ratios of polonium-210 to lead-210 indicated the occurrence of excess polonium-210 in coastal atmosphere, which may originate from marine surface waters either by indirect (foam), or more likely, direct (air-sea exchange) input of marine biogenic material into the atmosphere. This source is even more important than the in situ decay of lead-210. | YANG Weifeng CHEN Min HUANG Yipu LIU Guangshan JIA Chengxia | 2006 | Acta Oceanologica Sinica2006，25，6： | 3 |
| 4 | Novel testing equipment for tabric wrinkle resistance simulating actual wear显示文摘 | LIU Chengxia FU Yaqin WU Niying | 2014 | Textile Research Journal2014，84，10： | 1 |
| 5 | Will higher minimum temperatures increase corn production in Northeast China? An analysis of historical data over 1965–2008显示文摘 | Changqing Chen Chengxia Lei Aixing Deng Chunrong Qian Willem Hoogmoed Weijian Zhang | 2011 | Agricultural and Forest Meteorology2011，，12： | 1 |
| 6 | Microwave synthesis and biological activity of hydrazone derivatives containing 1,2,3- thiadiazole显示文摘 | Xinghai L Jianquan W Chengxia T | 2011 | Asian Journal of Chemistry2011，23，9： | 1 |
| 7 | Bioinspired Manganese and Iron Complexes with Tetradentate N Ligands for the Asymmetric Epoxidation of Olefins显示文摘 | Xiaoe Wang Chengxia Miao Shoufeng Wang Chungu Xia Wei Sun | 2013 | ChemCatChem2013，，8： | 1 |
| 8 | Effect of cationic and anionic surfactants on the sorption and de- sorption of perfluorooctane sulfonate (PFOS) on natural sediments 显示文摘 | Pan Gang Jia Chengxia Zhao Dongye | 2009 | Environmental Pollution2009，157，32： | 1 |
| 9 | Effect of salinity and sediment characteristics on the sorption and desorp- tion of perfluorooctane sulfonate at sediment-water in- terface 显示文摘 | You Chum Jia Chengxia Pan Gang | 2010 | Environmental Pollution2010，158，5： | 1 |
| 10 | The free boundary problem describing information diffusion in on line social networks 显示文摘 | LEI Chengxia LIN Zhigui WANG Haiyan | 2013 | J Diff Eqs2013，254，13： | 1 |
| 11 | Development of humanistic aursing in nurses training intervention and research显示文摘 | Wang Yi Zhang Deliao Liu Chengxia | 2009 | Chongqing Medical Journal2009，38，6： | 1 |
| 12 | Effect of cationic and anionic surfactants on the sorption and desorption of perfluorooctane sulfonate (PFOS) on natural sediments显示文摘 | Gang Pan Chengxia Jia Dongye Zhao | 2009 | Environmental Pollution2009，，157： | 1 |
| 13 | Will higher minimum temperatures increase corn production in NortheastChina? An analysis of historical data over 1965-2008显示文摘 | Chen Changqing Lei Chengxia Deng Aixing | 2011 | Agri- cultural and Forest Meteorology2011，151，12： | 1 |
| 14 | Effect of sim-ple bump on thermal elastohydrodynamic lubrication in recipro-cation line contact显示文摘 | Shi Chengxia Wang Jing Kaneta Motohiro | 2013 | Coal Mine Machinery2013，31，5： | 1 |
| 15 | MiCrowave synthesis and biological activity of hydrazone derivatives containing 1,2,3-thiadiazole 显示文摘 | Xinghai L Jianquan W Chengxia T | 2011 | Asian J Chem2011，23，9： | 1 |
| 16 | Effect of cationic and anionic surfactants on the sorption and desorption of perfluorooctane sulfonate (PFOS) on natural sediments显示文摘 | Pan Gang Jia Chengxia Zhao Dongye | 2009 | Environmental Pollution2009，157，： | 1 |
| 17 | Will higher minimum temperatures increase corn production in Northeast China? An analysis of historical data over 1965–2008显示文摘 | Changqing Chen Chengxia Lei Aixing Deng Chunrong Qian Willem Hoogmoed Weijian Zhang | 2011 | Agricultural and Forest Meteorology2011，，12： | 1 |
| 18 | Genetic and Molecular Characterization of the VRN2 Loci in Tetraploid Wheat1[W][OA]显示文摘 | Distelfeld Assaf Tranquilli Gabriela Li Chengxia Yan Liuling Dubcovsky Jorge | 2009 | Plant Physiology2009，，1： | 1 |
| 19 | Wheat flowering repressor VRN2 and promoter CO2 compete for in teractions with nuclear factory complexes显示文摘 | Chengxia Li Assaf Distelfeld J orge Dubcovsky | 2011 | The Plant Journal2011，67，： | 1 |
| 20 | Will higher minimum temperatures increase corn production in Northeast China? An analysis of historical data over 1965-- 2008显示文摘 | Chen Changqing Lei Chengxia Deng Aixing | 2011 | Agricultural and Forest Meteorology2011，151，12： | 1 |
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