Based on the dielectric continuum model and Loudon＇s uniaxial crystal model, the properties of the quasi. confined （QC） optical phonon dispersions and the electron-QC phonons coupling functions in an asymmetric wur...Based on the dielectric continuum model and Loudon＇s uniaxial crystal model, the properties of the quasi. confined （QC） optical phonon dispersions and the electron-QC phonons coupling functions in an asymmetric wurtzite quantum well （QW） are deduced via the method of electrostatic .potential expanding. The present theoretical scheme can naturally reduce to the results in symmetric wurtzite QW once a set of symmetric structural parameters are chosen. Numerical calculations on an asymmetric AlN/GaN/AIo,15 Gao.85N Wurtzite Q W are performed. A detailed comparison with the symmetric wurtzite QW was also performed. The results show that the structural asymmetry of wurtzite QW changes greatly the dispersion frequencies and the electrostatic potential distributions of the QC optical phonon modes.展开更多
The transformation of internal auditing （IA） from the function of supervision, management and control-oriented to governance-oriented are fulfilled while governance-oriented internal auditing emerging from the deman...The transformation of internal auditing （IA） from the function of supervision, management and control-oriented to governance-oriented are fulfilled while governance-oriented internal auditing emerging from the demand of corporate governance. The governance-oriented internal auditing （GOIA） is a risk-based assurance and consulting activity designed to add value into the organization focusing on the effectiveness of corporate governance in supervision and assessment by compound professional aims. Governance-oriented internal auditing includes board auditing, strategic auditing, management responsibility auditing and risk management auditing, etc..展开更多
基金The project supported by National Natural Science Foundation of China under Grant Nos. 60276004 and 6939007,3, the Scientilic Research Foundation for the Returned 0overseas Chinese Scholars State Education Ministry of China
文摘Based on the dielectric continuum model and Loudon＇s uniaxial crystal model, the properties of the quasi. confined （QC） optical phonon dispersions and the electron-QC phonons coupling functions in an asymmetric wurtzite quantum well （QW） are deduced via the method of electrostatic .potential expanding. The present theoretical scheme can naturally reduce to the results in symmetric wurtzite QW once a set of symmetric structural parameters are chosen. Numerical calculations on an asymmetric AlN/GaN/AIo,15 Gao.85N Wurtzite Q W are performed. A detailed comparison with the symmetric wurtzite QW was also performed. The results show that the structural asymmetry of wurtzite QW changes greatly the dispersion frequencies and the electrostatic potential distributions of the QC optical phonon modes.
文摘The transformation of internal auditing （IA） from the function of supervision, management and control-oriented to governance-oriented are fulfilled while governance-oriented internal auditing emerging from the demand of corporate governance. The governance-oriented internal auditing （GOIA） is a risk-based assurance and consulting activity designed to add value into the organization focusing on the effectiveness of corporate governance in supervision and assessment by compound professional aims. Governance-oriented internal auditing includes board auditing, strategic auditing, management responsibility auditing and risk management auditing, etc..
