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PUSLE—EKKO地质雷达在隧道超前预报中的应用
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作者 孙建国 王芳其 王连成 《公路隧道》 2005年第2期37-41,共5页
首先阐述地质超前预报的必要性和重要性,其次介绍了PUSLE—EKKO系列地质雷达系统构成及探测原理,最后举例说明PUSLE—EKKO地质雷达在公路隧道建设中的应用。
关键词 隧道 超前地质预报 pusle—EKKO地质雷达技术 探测原理
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Rectifying and photovoltaic properties of ZnCo_2O_4/Si heterostructure grown by pulsed laser deposition
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作者 陈钊 温晓莉 +4 位作者 牛利伟 段萌萌 张云捷 董祥雷 陈长乐 《Chinese Physics B》 SCIE EI CAS CSCD 2014年第5期465-469,共5页
ZnCo2O4/Si heterostructures have been fabricated by a pulsed laser deposition method, and their transport behaviors and photovoltaic properties have been characterized. The ZnCo2O4/Si heterostructures show a good rect... ZnCo2O4/Si heterostructures have been fabricated by a pulsed laser deposition method, and their transport behaviors and photovoltaic properties have been characterized. The ZnCo2O4/Si heterostructures show a good rectifying behavior at five different temperatures ranging from 50 K to 290 K. The measurements of the photovoltaic response reveals that a photovoltage of 33 mV is generated when the heterostructures are illuminated by a 532 nm laser of 250 mW/cm^2 and mechanically chopped at 2500 Hz. Both the photocurrent and the photovoltage clearly increase with the increase of the laser intensity at room temperature. However, the heterostructures' photovoltage peak decreases with the increase of the temperature. This work may open new perspectives for ZnCo2O4/Si heterostructure-based devices. 展开更多
关键词 ZnCo204/Si heterostructure rectifying behavior photovoltaic properties pusled laser deposition
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Effects of pulse flow and leading edge sweep on mixed flow turbines for engine exhaust heat recovery 被引量:1
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作者 ZHANG YangJun CHEN Li +1 位作者 ZHUGE WeiLin ZHANG ShuYong 《Science China(Technological Sciences)》 SCIE EI CAS 2011年第2期295-301,共7页
Recovery of heat energy from internal combustion engine exhaust will achieve significant road transportation CO2 reduction. Turbocharging and turbogenerating are most commonly used technologies to recover engine exhau... Recovery of heat energy from internal combustion engine exhaust will achieve significant road transportation CO2 reduction. Turbocharging and turbogenerating are most commonly used technologies to recover engine exhaust heat energy.Engine exhaust pulse flow can significantly affect the turbine performance of turbocharging and turbogenerating systems,and it is necessary to consider the pulse flow effects in turbine design and performance analysis.An investigation was carried out by numerical simulation on the mixed flow turbine pulse flow performance and flow fields.Results showed that the variations of the turbine efficiency and flowfiled under pulsating flow conditions demonstrate significant unsteady effects.The effect of blade leading edge sweep on turbine pulse flow performance was studied.It is shown that increasing of the leading edge sweep angle can improve the turbine average instantaneous efficiency by about 2 percent under pulsating flow conditions. 展开更多
关键词 waste heat recovery mixed flow turbine pusle flow
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