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星基增强系统电文及播发特性研究 被引量:12
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作者 黄双临 辛洁 +2 位作者 王冬霞 刘帅 郭靖蕾 《数字通信世界》 2019年第2期4-6,3,共4页
针对卫星导航系统定位精度不足、完好性要求较低无法满足高精度用户需求等问题,星基增强系统(SBAS)应运而生。随着星基增强技术的不断完善和应用范围推广,如何联合各大SBAS系统,提供无缝的SBAS系统服务引起了越来越多的关注。本文在梳... 针对卫星导航系统定位精度不足、完好性要求较低无法满足高精度用户需求等问题,星基增强系统(SBAS)应运而生。随着星基增强技术的不断完善和应用范围推广,如何联合各大SBAS系统,提供无缝的SBAS系统服务引起了越来越多的关注。本文在梳理和分析国内外SBAS电文设计标准的基础上,从SBAS的电文设计结构设计和播发策略方面开展了SBAS互操作需求分析,并基于星基增强电文解算处理方法研究提出了SBAS互操作设计的意见建议。 展开更多
关键词 星基增强系统 电文设计 标准
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Recent progress on advanced design for photoelectrochemical reduction of CO_2 to fuels 被引量:25
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作者 Ning Zhang Ran Long +1 位作者 Chao Gao Yujie Xiong 《Science China Materials》 SCIE EI CSCD 2018年第6期771-805,共35页
The energy crisis and global warming become severe issues. Solar-driven CO2 reduction provides a promising route to confront the predicaments, which has received much attention. The photoelectrochemical(PEC) process... The energy crisis and global warming become severe issues. Solar-driven CO2 reduction provides a promising route to confront the predicaments, which has received much attention. The photoelectrochemical(PEC) process,which can integrate the merits of both photocatalysis and electrocatalysis, boosts splendid talent for CO2 reduction with high efficiency and excellent selectivity. Recent several decades have witnessed the overwhelming development of PEC CO2 reduction. In this review, we attempt to systematically summarize the recent advanced design for PEC CO2 reduction. On account of basic principles and evaluation parameters, we firstly highlight the subtle construction for photocathodes to enhance the efficiency and selectivity of CO2 reduction, which includes the strategies for improving light utilization, supplying catalytic active sites and steering reaction pathway.Furthermore, diversiform novel PEC setups are also outlined.These exploited setups endow a bright window to surmount the intrinsic disadvantages of photocathode, showing promising potentials for future applications. Finally, we underline the challenges and key factors for the further development of PEC CO2 reduction that would enable more efficient designs for setups and deepen systematic understanding for mechanisms. 展开更多
关键词 PHOTOELECTROCATALYSIS CO2 reduction light utilization SEMICONDUCTOR SELECTIVITY
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