基于Thomson Reuters公司开发的学术文献信息检索平台ISI Web of Knowledge,采用计量分析和内容分析方法,从论文和引文两个侧面,测度中国远程教育在国际视野里的显示速度、显示广度和显示深度,借以观察中国远程教育对世界远程教育的贡...基于Thomson Reuters公司开发的学术文献信息检索平台ISI Web of Knowledge,采用计量分析和内容分析方法,从论文和引文两个侧面,测度中国远程教育在国际视野里的显示速度、显示广度和显示深度,借以观察中国远程教育对世界远程教育的贡献以及中国远程教育的国际化程度,进而思考如何加强和切实推进中国远程教育领域的国际交流。展开更多
Oceanic pycnocline depth is usually inferred from in situ measurements. It is attempted to estimate the depth remotely. As solitary internal waves occur on oceanic pycnocline and propagate along it, it is possible to ...Oceanic pycnocline depth is usually inferred from in situ measurements. It is attempted to estimate the depth remotely. As solitary internal waves occur on oceanic pycnocline and propagate along it, it is possible to retrieve the depth indirectly in virtue of the solitary internal waves. A numerical model is presented for retrieving the pycnocline depth from synthetic aperture radar （SAR） images where the solitary internal waves are visible and when ocean waters are fully stratified. This numerical model is constructed by combining the solitary internal wave model and a two-layer ocean model. It is also assumed that the observed groups of solitary internal wave packets on the SAR imagery are generated by local semidiurnal tides. A case study in the East China Sea shows a good agreement with in situ CTD （conductivity-temperature-depth） data.展开更多
文摘基于Thomson Reuters公司开发的学术文献信息检索平台ISI Web of Knowledge,采用计量分析和内容分析方法,从论文和引文两个侧面,测度中国远程教育在国际视野里的显示速度、显示广度和显示深度,借以观察中国远程教育对世界远程教育的贡献以及中国远程教育的国际化程度,进而思考如何加强和切实推进中国远程教育领域的国际交流。
基金This project was supported by the National Natural Science Foundation of China under contract No.40206023the National Hi-Tech Project(“863”Program)of China under contract Nos 2002AA639360 and 2002AA633120.
文摘Oceanic pycnocline depth is usually inferred from in situ measurements. It is attempted to estimate the depth remotely. As solitary internal waves occur on oceanic pycnocline and propagate along it, it is possible to retrieve the depth indirectly in virtue of the solitary internal waves. A numerical model is presented for retrieving the pycnocline depth from synthetic aperture radar （SAR） images where the solitary internal waves are visible and when ocean waters are fully stratified. This numerical model is constructed by combining the solitary internal wave model and a two-layer ocean model. It is also assumed that the observed groups of solitary internal wave packets on the SAR imagery are generated by local semidiurnal tides. A case study in the East China Sea shows a good agreement with in situ CTD （conductivity-temperature-depth） data.
