In this paper, the activities of components of Ga-Sb system have been calculated from its phase diagram by using computer program CABPD (calculating activities from binary phase diagrams) presented by us in previous p...In this paper, the activities of components of Ga-Sb system have been calculated from its phase diagram by using computer program CABPD (calculating activities from binary phase diagrams) presented by us in previous paper. The excess free energy of liquid solution can be expressed as: ΔG_m=X_(Ga)X_(Sb)(4392+17022X_(Sb)-15138X_(Sb)) J/mol In order to verify the reliability of calculated results, a discriminant has been proposed.展开更多
The calculated results of thermodynamic properties in ternary Au-Ga-Sb system by general solution model were presented in this paper.The calculations were carried out in nine cross sections from all three corners in t...The calculated results of thermodynamic properties in ternary Au-Ga-Sb system by general solution model were presented in this paper.The calculations were carried out in nine cross sections from all three corners in the temperature range of 973–1,573 K,and integral molar excess Gibbs energies,partial molar Gibbs energies,activity coefficients and activities for all components are obtained.The activity of gold and gallium shows negative deviation from Rault＇s law for all investigated sections,while antimony activity is close to the line of ideal conditions and even coincides with the line for high content of antimony in the alloy.Data obtained by calculation were compared with those found in literature.It is concluded that compared values show reasonable good agreement.展开更多
A simple and efficient approximate analytical technique is presented to obtain solutions to a class of two-point boundary value similarity problems in fluid mechanics. This technique is based on the decomposition meth...A simple and efficient approximate analytical technique is presented to obtain solutions to a class of two-point boundary value similarity problems in fluid mechanics. This technique is based on the decomposition method which yields a genera/analytic solution in the form of a convergent infinite series with easily computable terms. Comparative study is carried out to show the accuracy and effectiveness of the technique.展开更多
为实现2μm低发散角激光,提出在Ga Sb基半导体激光器中引入布拉格反射波导,利用光子带隙效应替代传统的全反射进行光场限制。研究了分布反馈反射镜(DBR)的厚度、对数、高低折射率DBR厚度比以及中心腔厚度等参数对激光器垂直远场发散角...为实现2μm低发散角激光,提出在Ga Sb基半导体激光器中引入布拉格反射波导,利用光子带隙效应替代传统的全反射进行光场限制。研究了分布反馈反射镜(DBR)的厚度、对数、高低折射率DBR厚度比以及中心腔厚度等参数对激光器垂直远场发散角和光限制因子的影响。结果表明:垂直远场发散角随单对DBR厚度的增加而减小;光限制因子与远场发散角都随拉格反射镜对数的增加而减小,随高低折射率DBR厚度比的减小而增大;随着中心层厚度的增大,光限制因子减小而远场发散角增大。最终在理论上优化设计出了一种双边布拉格反射波导结构的超低垂直发散角2μm Ga Sb基边发射半导体激光器,其垂直远场发散角可降低到10°以下。展开更多
文摘In this paper, the activities of components of Ga-Sb system have been calculated from its phase diagram by using computer program CABPD (calculating activities from binary phase diagrams) presented by us in previous paper. The excess free energy of liquid solution can be expressed as: ΔG_m=X_(Ga)X_(Sb)(4392+17022X_(Sb)-15138X_(Sb)) J/mol In order to verify the reliability of calculated results, a discriminant has been proposed.
基金financially supported by the Ministry of Education,Science and Technological Development of the Republic of Serbia (Nos.34005 and 172037)
文摘The calculated results of thermodynamic properties in ternary Au-Ga-Sb system by general solution model were presented in this paper.The calculations were carried out in nine cross sections from all three corners in the temperature range of 973–1,573 K,and integral molar excess Gibbs energies,partial molar Gibbs energies,activity coefficients and activities for all components are obtained.The activity of gold and gallium shows negative deviation from Rault＇s law for all investigated sections,while antimony activity is close to the line of ideal conditions and even coincides with the line for high content of antimony in the alloy.Data obtained by calculation were compared with those found in literature.It is concluded that compared values show reasonable good agreement.
基金supported in part by the National Science and Technology Major Project of China(2017ZX02301007-002)Xu M acknowledges the National Natural Science Foundation of China(62174060)Miao X acknowledges the funding for Hubei Key Laboratory of Advanced Memories。
文摘A simple and efficient approximate analytical technique is presented to obtain solutions to a class of two-point boundary value similarity problems in fluid mechanics. This technique is based on the decomposition method which yields a genera/analytic solution in the form of a convergent infinite series with easily computable terms. Comparative study is carried out to show the accuracy and effectiveness of the technique.
文摘为实现2μm低发散角激光,提出在Ga Sb基半导体激光器中引入布拉格反射波导,利用光子带隙效应替代传统的全反射进行光场限制。研究了分布反馈反射镜(DBR)的厚度、对数、高低折射率DBR厚度比以及中心腔厚度等参数对激光器垂直远场发散角和光限制因子的影响。结果表明:垂直远场发散角随单对DBR厚度的增加而减小;光限制因子与远场发散角都随拉格反射镜对数的增加而减小,随高低折射率DBR厚度比的减小而增大;随着中心层厚度的增大,光限制因子减小而远场发散角增大。最终在理论上优化设计出了一种双边布拉格反射波导结构的超低垂直发散角2μm Ga Sb基边发射半导体激光器,其垂直远场发散角可降低到10°以下。
