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RF energy harvesting system for wireless intraocular pressure monitoring 被引量:1
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作者 刘德盟 Mei Niansong Zhang Zhaofeng 《High Technology Letters》 EI CAS 2015年第2期212-218,共7页
This paper presents an RF energy harvesting system for wireless intraocular pressure monitoring applications.The system consists of an implantable antenna and a rectifier.A new sizing strategy is adopted to optimize t... This paper presents an RF energy harvesting system for wireless intraocular pressure monitoring applications.The system consists of an implantable antenna and a rectifier.A new sizing strategy is adopted to optimize the conversion efficiency of the rectifier,and the design principle of an implantable antenna is introduced from material selection and structure design.Results from testing demonstrate that the antenna gain is about-20 dBi and the rectifier's maximum total conversion efficiency which contains match efficiency and rectifying efficiency is 47.18%under the implementation of0.18μm standard CMOS process.The maximum power obtained from the proposed system is 8μW when the power density of electromagnetic wave is lower than the national standard 40μW/cm^2 at915 MHz,which is enough to power the intraocular pressure monitoring system. 展开更多
关键词 RF energy harvesting system implantable medical system ANTENNA RECTIFIER intraocular pressure monitoring
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立式集热板太阳能热气流电站系统研究 被引量:12
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作者 周艳 李庆领 +1 位作者 李洁浩 刘晓惠 《工程热物理学报》 EI CAS CSCD 北大核心 2010年第3期465-468,共4页
设计了一种立式集热板式太阳能热气流电站,分析了该系统的最大输出功率及能量转换率。数学模型考虑了系统尺寸、太阳辐射及环境条件对系统最大输出功率的影响。结果表明系统最大输出功率不仅是烟囱高度的函数,同时与太阳辐射及环境参数... 设计了一种立式集热板式太阳能热气流电站,分析了该系统的最大输出功率及能量转换率。数学模型考虑了系统尺寸、太阳辐射及环境条件对系统最大输出功率的影响。结果表明系统最大输出功率不仅是烟囱高度的函数,同时与太阳辐射及环境参数有很大关系。受结构限制,在太阳辐射强度为1000 W/m^2、烟囱高度为100m时,本系统能量转换率约为0.2%,在设计上可考虑采用多条集热式烟囱通道并联方式来增加集热面积,以达到提高系统最大输出功率的目的。 展开更多
关键词 太阳能热气流电站 立式集热热板 系统最大输出功率 系统能量转换率
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Thermodynamic analysis on medium-high temperature solar thermal systems with selective coatings 被引量:4
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作者 HU Peng LIU Yang +1 位作者 ZHANG Qian CHEN ZeShao 《Science China(Technological Sciences)》 SCIE EI CAS 2013年第12期3137-3143,共7页
Thermodynamics analysis was carried out for solar thermal receivers with different selective coatings.The relation between the energy conversion efficiency of a medium-high temperature solar thermal system,the spectra... Thermodynamics analysis was carried out for solar thermal receivers with different selective coatings.The relation between the energy conversion efficiency of a medium-high temperature solar thermal system,the spectral properties of selective coating and the operating temperature of the receiver were discussed.Furthermore,the relation between the optimum operating temperatures,the exergy efficiencies and the incident solar flux were analyzed for the traditional concentrating system and concentrating beam splitting system,respectively.According to the analysis results for the thermal receiver with blackbody surface and selective coatings,the optimum cutoff wavelength was obtained for the ideal selective coating.An analysis method for the optimum operating temperature calculation was developed for thermal receivers with selective coating.The optimum operating temperature for an actual selective coating was analyzed on the basis of the proposed theory. 展开更多
关键词 solar energy thermal receiver selective coating thermodynamic analysis concentrating beam splitting solar system
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