作者机构：
[王晓亮; 彭国文] School of Chemistry and Chemical Engineering, University of South China, Hengyang, China;[杨锦然; 黄红; 周归] Wang Chuanshan College, University of South China, Hengyang, China;[彭国文] School of Resources and Safety Engineering, Central South University, Changsha, China;[胡南; 肖方竹; 彭国文; 丁德馨; 张志军] Key Discipline Laboratory for National Defence for Biotechnology in Uranium Mining and Hydrometallurgy, University of South China, Hengyang, China
通讯机构：
School of Chemistry and Chemical Engineering, University of South China, Hengyang, China
摘要：
Attachments of Acidithiobacillus ferrooxidans ATCC 23270 onto elemental sulfur, quartz and complex chalcopyrite were investigated by analysis of its extracellular polymeric substances as well as applying Langmuir and Freundlich equations. The two equations fitted the adsorption equilibrium data with significant correlation coefficient over 0.9. This indicated that bacterial attachment is complicated and involves Langmuir and Freundlich characterizations. Sulfur-grown cells showed the highest affinity for the three solid substrates. The investigated complex chalcopyrite possessed a higher maximum adsorption capacity for A. ferrooxidans than elemental sulfur or quartz. The Freundlich fitting parameters suggested that quartz had a weaker adsorption capacity and smaller adsorption areas than elemental sulfur or the complex chalcopyrite. It is not the content of total carbohydrates or proteins in EPS but their ratios that determine the affinity differences between cells and substrates.
期刊：
Applied Mechanics and Materials,2011年71-78:3197-3200 ISSN：1660-9336
通讯作者：
Wang, Shuyun
作者机构：
[Wang, Shuyun] Univ South China, Sch Environm Protect & Safety Engn, Hengyang 421001, Peoples R China.;[Xie, Xionggang] Guizhou Univ, Min Coll, Guiyang 550004, Peoples R China.;[Chen, Xi] Univ South China, Chuanshan Coll, Hengyang 421001, Peoples R China.
通讯机构：
[Wang, Shuyun] U;Univ South China, Sch Environm Protect & Safety Engn, Hengyang 421001, Peoples R China.
会议名称：
2011 International Conference on Green Building, Materials and Civil Engineering, GBMCE 2011
会议时间：
22 August 2011 through 23 August 2011
会议地点：
Shangri La, PEOPLES R CHINA
会议主办单位：
[Wang, Shuyun] Univ South China, Sch Environm Protect & Safety Engn, Hengyang 421001, Peoples R China.^[Xie, Xionggang] Guizhou Univ, Min Coll, Guiyang 550004, Peoples R China.^[Chen, Xi] Univ South China, Chuanshan Coll, Hengyang 421001, Peoples R China.
会议论文集名称：
Applied Mechanics and Materials
关键词：
Computer Aided Design (CAD);Excavation;Numerical Simulation;Stratified Rock Mass;Tunnel
摘要：
Stratified rock mass is widely existing in tunnel engineering. The most relevant feature of stratified rocks is the occurrence of very persistent bedding, which makes the rock-mass highly non-isotropic. A number of techniques for designing underground excavations in stratified media have been described in the literature, like theoretical method and laboratory test, which can only be applied in analyzing the problem with simple geometry and costs much expense. Recently, with rapid development of computer technique, numerical simulation methods have been widely applied in engineerin. Among all the numerical simulation methods, fast lagrangian explicit finite difference code of continua (FLAC3D) is widely used to solve practical problems, especially in field of elasto-plastic characteristic, large deformation analysis and construction procedure. So in the present paper, numerical simulation for the failure mode of stratified rock mass after tunnel excavation is done by FLAC3D, which can give further guidance to understand the anisotropic characteristic of stratified rock mass.
