Two efficient single-site Ru water oxidation catalysts [Ru（bda）（pic）（Ln）] （bda=2,2＇-bipyridine- 6,6＇-dicarboxylic acid, pic=picoline, Ll=4,5-bipyridine-2,7-di-tett-butyl-9,9-dimethylxanthene, L2=4- pyridine-5...Two efficient single-site Ru water oxidation catalysts [Ru（bda）（pic）（Ln）] （bda=2,2＇-bipyridine- 6,6＇-dicarboxylic acid, pic=picoline, Ll=4,5-bipyridine-2,7-di-tett-butyl-9,9-dimethylxanthene, L2=4- pyridine-5-phenyl-2,7-di-tert-butyl-9,9-dimethylxanthene） were only synthesized containing different xanthene ligands at the axial site. These complexes have been thoroughly characterized by spectroscopic （UV-vis, NMR） and electrochemical （CV and DIV） techniques. Kinetic analysis proved that the mechanism of water oxidation comprises the water nucleophilic attack process on high-valence ruthenium species. It is found that the catalyst I displayed higher activity than catalyst 2 on water oxidation, caused by the protonation of the axial ligand LI with a free pyridine.展开更多
Dear Colleagues,I am writing on behalf of the International Council of Ophthalmology (ICO) to thank all those who contributed to makingthe 2008 World Ophthalmology Congress (WOC) in Hong Hong an outstanding success an...Dear Colleagues,I am writing on behalf of the International Council of Ophthalmology (ICO) to thank all those who contributed to makingthe 2008 World Ophthalmology Congress (WOC) in Hong Hong an outstanding success and to announce that selected presentations fromthe WOC are nowavailable online.展开更多
通过广州珠江数码集团(以下简称"珠江数码")的实践,探讨了有线电视运营商建设无线传输网络的思路及可行性方案。首先从用户发展的核心角度分析了有线运营商建设无线传输网络的重要性,然后从基础网络、视频业务技术、产业链整...通过广州珠江数码集团(以下简称"珠江数码")的实践,探讨了有线电视运营商建设无线传输网络的思路及可行性方案。首先从用户发展的核心角度分析了有线运营商建设无线传输网络的重要性,然后从基础网络、视频业务技术、产业链整合等方面论证了其可行性,最后介绍了珠江数码在NGB-W、Cable Wi Fi技术、WOC技术上的尝试以及遇到的问题。展开更多
Wo C技术是通过2.4G无线信号在现有有线电视同轴线缆上传输,其解决了最后50m宽带接入并实现用户房间内的Wi-Fi信号覆盖。通过Wi-Fi网络覆盖小区住户,可实现用户机顶盒无线数据回传及互联网无线宽带接入,在一个用户面板上同时为家庭用户...Wo C技术是通过2.4G无线信号在现有有线电视同轴线缆上传输,其解决了最后50m宽带接入并实现用户房间内的Wi-Fi信号覆盖。通过Wi-Fi网络覆盖小区住户,可实现用户机顶盒无线数据回传及互联网无线宽带接入,在一个用户面板上同时为家庭用户提供面向机顶盒、电脑和手机的三网融合和三屏互动能力。展开更多
随着笔记本电脑和带智能手机的普及,WLAN无线上网的需求越来越广泛,但是随着多家运营商、多种制式的同时开展,给WLAN室内覆盖的发展与建设带来了很多问题,造成网速慢。目前WOC(WLAN Over CATV)方案可以很好解决WLAN室内覆盖相互干扰、...随着笔记本电脑和带智能手机的普及,WLAN无线上网的需求越来越广泛,但是随着多家运营商、多种制式的同时开展,给WLAN室内覆盖的发展与建设带来了很多问题,造成网速慢。目前WOC(WLAN Over CATV)方案可以很好解决WLAN室内覆盖相互干扰、信号衰减大等情况。展开更多
基金supported by the National Basic Research Program of China (973 program, 2014CB239402)the National Natural Science Foundation of China (21573033)the Basic Research Project of Key Laboratory of Liaoning (LZ2015015)
文摘Two efficient single-site Ru water oxidation catalysts [Ru（bda）（pic）（Ln）] （bda=2,2＇-bipyridine- 6,6＇-dicarboxylic acid, pic=picoline, Ll=4,5-bipyridine-2,7-di-tett-butyl-9,9-dimethylxanthene, L2=4- pyridine-5-phenyl-2,7-di-tert-butyl-9,9-dimethylxanthene） were only synthesized containing different xanthene ligands at the axial site. These complexes have been thoroughly characterized by spectroscopic （UV-vis, NMR） and electrochemical （CV and DIV） techniques. Kinetic analysis proved that the mechanism of water oxidation comprises the water nucleophilic attack process on high-valence ruthenium species. It is found that the catalyst I displayed higher activity than catalyst 2 on water oxidation, caused by the protonation of the axial ligand LI with a free pyridine.
文摘Dear Colleagues,I am writing on behalf of the International Council of Ophthalmology (ICO) to thank all those who contributed to makingthe 2008 World Ophthalmology Congress (WOC) in Hong Hong an outstanding success and to announce that selected presentations fromthe WOC are nowavailable online.
文摘通过广州珠江数码集团(以下简称"珠江数码")的实践,探讨了有线电视运营商建设无线传输网络的思路及可行性方案。首先从用户发展的核心角度分析了有线运营商建设无线传输网络的重要性,然后从基础网络、视频业务技术、产业链整合等方面论证了其可行性,最后介绍了珠江数码在NGB-W、Cable Wi Fi技术、WOC技术上的尝试以及遇到的问题。
