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We analyze thematic trends and challenging issues in fuel cell research based on the metadata of 4185 research papers indexed in Science Citation Index (SCI) database between 1990 and 2007. We specifically address 1) all-time prominent challenges in fuel cell, 2) a trend of progression in fuel cell, 3) the structure and dynamics of the fuel cell community. We utilize CiteSpace, a progressive domain...
The small-size unmanned helicopters have good application values in many areas. A beyond-visual-range controlled helicopter display system framework is built. By acquisition of signals of angle sensor, magnetoresistive sensor, GPS module, the flying information of pitch, incline, direction, position, etc. in helicopter is gotten in the system. The signals coded by single-chip microcomputer are wirelessly...
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