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硅基外延GaAs材料的力学仿真分析
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作者 唐军 郭浩 +1 位作者 刘俊 赵锐 《传感器与微系统》 CSCD 北大核心 2012年第5期37-39,43,共4页
Si,GaAs,Si基异质外延GaAs三种材料的基本力学特性各有不同,通过理论计算和ANSYS仿真得出相同条件下Si基异质外延GaAs材料中GaAs应力转化率是Si和GaAs材料的1.26倍左右,应力造成的位移系数略小于Si,远远小于GaAs,同时经过计算得出Si基... Si,GaAs,Si基异质外延GaAs三种材料的基本力学特性各有不同,通过理论计算和ANSYS仿真得出相同条件下Si基异质外延GaAs材料中GaAs应力转化率是Si和GaAs材料的1.26倍左右,应力造成的位移系数略小于Si,远远小于GaAs,同时经过计算得出Si基异质外延GaAs材料的量程是GaAs材料的5倍,说明Si基外延GaAs材料不仅机械特性良好,而且还明显优于Si和GaAs,有更好的力电耦合效应需要的机械特性。 展开更多
关键词 Si基异质外延GaAs材料 应力转化率 位移系数 力电耦合效应
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Investigation of Propene Oligomerization Catalyzed by Phosphotungstic Acid Catalysts
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作者 Liu Yinong Duan Qinghua 《China Petroleum Processing & Petrochemical Technology》 SCIE CAS 2012年第3期10-16,共7页
In this paper, the propene oligomerization reaction catalyzed by phosphotungstic acid supported on two kinds of silica gel was studied, it had been found out that the conversion of propene catalyzed by the type A sili... In this paper, the propene oligomerization reaction catalyzed by phosphotungstic acid supported on two kinds of silica gel was studied, it had been found out that the conversion of propene catalyzed by the type A silica gel-phosphotung- stic acid catalyst was 3.38 m%, while the conversion of propene catalyzed by the type B silica gel-phosphotungstic acid catalyst was 90.1 m% with a nonene selectivity of 42.33 m%, and a dodecene selectivity of 31.79 m%. The influence of reaction temperature, pressure and liquid hourly space velocity (LHSV) on the reaction catalyzed by the type B silica gel- phosphotungstic acid catalyst was investigated. It had been verified that when the reaction temperature increased from 170 ~C to 190 ~C, the conversion of propene increased while the selectivity of nonene and dodecene decreased; when the re- action pressure increased from 3.5 MPa to 4.5 MPa, the conversion of propene increased also, and the selectivity of nonene and dodecene changed very little. The conversion of propene at a space velocity of between 0.5 h-1 and 1.0 h-~ was higher than that achieved at 2.0 h-~, but the selectivity of nonene and dodecene did not show regular fluctuations. An optimum conversion of propene (91.05 m%) and an optimum selectivity of nonene and dodecene (89.51 m%) could be achieved at a reaction temperature of 170 ~C, a reaction pressure of 4.5MPa, and a LHSV of 1.0 fit. The experiments on catalyst life showed that the activity of the type B silica gel-phosphotungstic acid catalyst could be only maintained in 25 hours, and the reason was explained also. 展开更多
关键词 phosphotungstic acid SUPPORT propene oligomerization CONVERSION SELECTIVITY nonene dodecene
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