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单站式大气电场仪探测距离分析 被引量:1
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作者 邓海利 李莉 +1 位作者 赵京峰 李永果 《安徽农业科学》 CAS 2015年第21期222-224,共3页
通过对电子设备防雷需求的计算,确定大气电场仪应有的探测距离;通过对几种情况下大气电场的分析、计算,结合大气电场仪的探测原理及探测公式,确定大气电场仪的探测距离,并对其进行分析。通过对大气电场仪探测距离和电子设备防雷需求的... 通过对电子设备防雷需求的计算,确定大气电场仪应有的探测距离;通过对几种情况下大气电场的分析、计算,结合大气电场仪的探测原理及探测公式,确定大气电场仪的探测距离,并对其进行分析。通过对大气电场仪探测距离和电子设备防雷需求的预警距离对比,得出单站式大气电场仪应根据使用者的需求,降低探测距离,提高探测准确度。 展开更多
关键词 单站式 大气电场仪 防雷 探测距离 探测准确度
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低功耗单站式电离层探测仪的雷达脉冲波形研究
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作者 武文俊 姚明 +1 位作者 邓晓华 周猛 《武汉大学学报(信息科学版)》 EI CSCD 北大核心 2013年第3期374-377,共4页
从理论分析、计算机仿真及雷达实际探测结果等多方面入手,对比了采用不同脉冲形状的脉间二相编码脉冲串雷达波形的探测性能。与脉间二相编码矩形脉冲串波形相比,脉间二相编码高斯脉冲串波形可以实现更高的频谱利用率、更好的测距精度、... 从理论分析、计算机仿真及雷达实际探测结果等多方面入手,对比了采用不同脉冲形状的脉间二相编码脉冲串雷达波形的探测性能。与脉间二相编码矩形脉冲串波形相比,脉间二相编码高斯脉冲串波形可以实现更高的频谱利用率、更好的测距精度、更高的距离分辨率和相同的多普勒分辨率,而且它特别适用于电离层探测仪。本文的仿真和实验方法也适用于其他雷达波形的比较和研究。 展开更多
关键词 单站式电离层探测仪 脉间二相编码脉冲串 脉冲波形
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Analysis of temporal and spatial usage patterns of dockless bike sharing system around rail transit station area 被引量:5
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作者 Ji Yanjie Cao Yu +1 位作者 Liu Yang Ma Xinwei 《Journal of Southeast University(English Edition)》 EI CAS 2019年第2期228-235,共8页
In order to study the spatiotemporal characteristics of the dockless bike sharing system(BSS)around urban rail transit stations,new normalized calculation methods are proposed to explore the temporal and spatial usage... In order to study the spatiotemporal characteristics of the dockless bike sharing system(BSS)around urban rail transit stations,new normalized calculation methods are proposed to explore the temporal and spatial usage patterns of the dockless BSS around rail transit stations by using 5-weekday dockless bike sharing trip data in Nanjing,China.First,the rail transit station area(RTSA)is defined by extracting shared bike trips with trip ends falling into the area.Then,the temporal and spatial decomposition methods are developed and two criterions are calculated,namely,normalized dynamic variation of bikes(NDVB)and normalized spatial distribution of trips(NSDT).Furthermore,the temporal and spatial usage patterns are clustered and the corresponding geographical distributions of shared bikes are determined.The results show that four temporal usage patterns and two spatial patterns of dockless BSS are finally identified.Area type(urban center and suburb)has a great influence on temporal usage patterns.Spatial usage patterns are irregular and affected by limited directions,adjacent rail transit stations and street networks.The findings can help form a better understanding of dockless shared bike users behavior around rail transit stations,which will contribute to improving the service and efficiency of both rail transit and BSS. 展开更多
关键词 dockless bike sharing system rail transit station usage pattern CLUSTER
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Pioneering Proposal of Floating Type Ocean Wave Power Station 被引量:2
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作者 Shun Okamoto Toshiaki Kanemoto 《Journal of Energy and Power Engineering》 2013年第4期633-638,共6页
This serial research develops the unique ocean wave power station, which is composed of the floating type platform with a pair of the floats arranged at the interval of one wavelength and the counter-rotating type wav... This serial research develops the unique ocean wave power station, which is composed of the floating type platform with a pair of the floats arranged at the interval of one wavelength and the counter-rotating type wave power unit whose runners are submerged in the seawater at the middle position of the platform. Such profiles make the flow velocity through the runners two times faster than that of the traditional fixed/caisson type OWC (oscillating water column), that is, the runners may be able to get the dynamical energy eight times on the ideal. Besides, the runners counter-drive the inner and the outer armatures of the peculiar generator, respectively, and then the relative rotational speed is two times as fast as the speed of the single runner/armature. Such characteristics make the runner diameter large, namely the output higher, as you request, because the rotational moment of the power unit hardly act on the floating type platform. This paper, as the first step, discusses the platform behaviors at the normally oscillating wave. The platform behavior is affected by not only the length and the amplitude of the wave but also the relation between the weight of the platform and the buoyancy force of the floats. 展开更多
关键词 Renewable energy ocean wave FLOAT PLATFORM counter-rotation power unit.
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