校长是经营和管理学校的“推手”，校长的领导力与所作所为对师生和学校的可持续发展均具有重要的影响。在推动基础教育信息化的进程中，英国积极采取有效措施来努力提高校长的信息化领导力。本文所介绍的是英国全国学校领导力学院与教...校长是经营和管理学校的“推手”，校长的领导力与所作所为对师生和学校的可持续发展均具有重要的影响。在推动基础教育信息化的进程中，英国积极采取有效措施来努力提高校长的信息化领导力。本文所介绍的是英国全国学校领导力学院与教育技术通讯署共同开发的信息化领导力（the Strategic Leadership of ICT，即SLICT）项目。展开更多
Bi1-xSmxFeO3 films with x= 0, 0.03, 0.05, 0.07 and 0.10 are prepared on LaNiO3/Si（100） substrates by the sol-gel method. X-ray diffraction patterns reveal that pure phase films with random orientations are fabricate...Bi1-xSmxFeO3 films with x= 0, 0.03, 0.05, 0.07 and 0.10 are prepared on LaNiO3/Si（100） substrates by the sol-gel method. X-ray diffraction patterns reveal that pure phase films with random orientations are fabricated. The results of SEM indicate that films with denser surfaces are obtained by Sm substitution. At the doping level of x=0.05, remnant polarization Pr increases to 3.19 μC/cm2 from 1.12 μC/cm2 of the un-substituted BiFeO3 film and shows enhanced ferroelectricity at room temperature. Because of the low leakage current density in the high electric field region, a polarization hysteresis loop with remanent polarization of 5.15 μC/cm2 is observed in the 0.10 Sm-substituted BiFeO3 films at the applied electric field of 226 kV/cm. Through the substitution of Sm, the leakage current density is reduced for the films with x= 0.07-0.10.展开更多
文摘校长是经营和管理学校的“推手”，校长的领导力与所作所为对师生和学校的可持续发展均具有重要的影响。在推动基础教育信息化的进程中，英国积极采取有效措施来努力提高校长的信息化领导力。本文所介绍的是英国全国学校领导力学院与教育技术通讯署共同开发的信息化领导力（the Strategic Leadership of ICT，即SLICT）项目。
基金Supported by the National Natural Science Foundation of China under Grant Nos 50588201 and 50672078.
文摘Bi1-xSmxFeO3 films with x= 0, 0.03, 0.05, 0.07 and 0.10 are prepared on LaNiO3/Si（100） substrates by the sol-gel method. X-ray diffraction patterns reveal that pure phase films with random orientations are fabricated. The results of SEM indicate that films with denser surfaces are obtained by Sm substitution. At the doping level of x=0.05, remnant polarization Pr increases to 3.19 μC/cm2 from 1.12 μC/cm2 of the un-substituted BiFeO3 film and shows enhanced ferroelectricity at room temperature. Because of the low leakage current density in the high electric field region, a polarization hysteresis loop with remanent polarization of 5.15 μC/cm2 is observed in the 0.10 Sm-substituted BiFeO3 films at the applied electric field of 226 kV/cm. Through the substitution of Sm, the leakage current density is reduced for the films with x= 0.07-0.10.
