2022年是国际慕课发展十周年,在这个重要的时间节点系统梳理近十年来国际慕课研究的相关文献,对于我国慕课建设具有重要参考价值。基于此,文章首先从Web of Science核心合集中进行主题检索,获得2012~2022年间刊发的1775篇慕课研究相关文...2022年是国际慕课发展十周年,在这个重要的时间节点系统梳理近十年来国际慕课研究的相关文献,对于我国慕课建设具有重要参考价值。基于此,文章首先从Web of Science核心合集中进行主题检索,获得2012~2022年间刊发的1775篇慕课研究相关文献;然后运用CiteSpace软件,通过时间知识图谱分析和空间知识图谱分析梳理了国际慕课研究现状,并通过高突现文献与关键词分析揭示了国际慕课研究的热点及其演变;最后,文章探讨了国际慕课研究对我国慕课建设的启示,以期助益我国慕课及在线教育高质量发展。展开更多
We report the fabrication of planar waveguides in Nd^(3+)-doped phosphate glass by helium ion implantation.The guiding properties of the waveguide are evaluated by a prism coupler and end-face coupling methods.The ref...We report the fabrication of planar waveguides in Nd^(3+)-doped phosphate glass by helium ion implantation.The guiding properties of the waveguide are evaluated by a prism coupler and end-face coupling methods.The refractive index profile of the waveguide is reconstructed by using the intensity calculation method.Absorption and fluorescence investigations reveal that helium ion implantation causes only slight changes in the optical properties,suggesting the possible application of the fabricated structures as waveguide lasers.展开更多
文摘2022年是国际慕课发展十周年,在这个重要的时间节点系统梳理近十年来国际慕课研究的相关文献,对于我国慕课建设具有重要参考价值。基于此,文章首先从Web of Science核心合集中进行主题检索,获得2012~2022年间刊发的1775篇慕课研究相关文献;然后运用CiteSpace软件,通过时间知识图谱分析和空间知识图谱分析梳理了国际慕课研究现状,并通过高突现文献与关键词分析揭示了国际慕课研究的热点及其演变;最后,文章探讨了国际慕课研究对我国慕课建设的启示,以期助益我国慕课及在线教育高质量发展。
基金by the National Natural Science Foundation of China under Grant Nos 61077070,10876009 and 51002181,and the One-Hundred Talents Program of the Chinese Academy of Sciences.
文摘We report the fabrication of planar waveguides in Nd^(3+)-doped phosphate glass by helium ion implantation.The guiding properties of the waveguide are evaluated by a prism coupler and end-face coupling methods.The refractive index profile of the waveguide is reconstructed by using the intensity calculation method.Absorption and fluorescence investigations reveal that helium ion implantation causes only slight changes in the optical properties,suggesting the possible application of the fabricated structures as waveguide lasers.
