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超声波移动物体探测器 被引量:1
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作者 张天石 《集成电路应用》 1994年第5期32-33,共2页
本文介绍一种利用超声波探测移动物体的探测器。这种探测器具有体积小。成本低、控制范围宽、可靠性高和应用范围广等特点,它能判断被探测区域内有无活动的人、动物或其它移动的物体。它可以用作自动电梯启动器、自动开关门控制器、防... 本文介绍一种利用超声波探测移动物体的探测器。这种探测器具有体积小。成本低、控制范围宽、可靠性高和应用范围广等特点,它能判断被探测区域内有无活动的人、动物或其它移动的物体。它可以用作自动电梯启动器、自动开关门控制器、防盗报警器等,所以值得推广应用。 展开更多
关键词 探测器 超声波 移动积体
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Analytical Solution for Peristaltic Transport of Viscous Nanofluid in an Asymmetric Channel with Full Slip and Convective Conditions
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作者 Abdelhalim Ebaid Emad H. Aly K. Vajravelu 《Communications in Theoretical Physics》 SCIE CAS CSCD 2017年第7期96-102,共7页
The peristaltic ttow of nanofluids is a relatively new area of research. Scientists are of the opinion that the no-slip conditions at the boundaries are no longer valid and consequently, the first and the second order... The peristaltic ttow of nanofluids is a relatively new area of research. Scientists are of the opinion that the no-slip conditions at the boundaries are no longer valid and consequently, the first and the second order slip conditions should be addressed. In this paper, the effects of slip conditions and the convective boundary conditions at the boundary walls on the peristaltic flow of a viscous nanofluid are investigated for. Also, the exact analytical solutions are obtained for the model. The obtained results are presented through graphs and discussed. The results reveal that the two slip parameters have strong effects on the temperature and the nanoparticles volume fraction profiles. Moreover, it has been seen that the temperature and nanoparticles volume fraction profiles attain certain values when the first slip condition exceeds a specified value. However, no limit value for the second slip parameter has been detected. Further, the effects of the various emerging parameters on the flow and heat transfer characteristics have been presented. 展开更多
关键词 NANOFLUID peristaltic flow slip model convective conditions asymmetric channel
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