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2篇 您的检索式:作者名="GUANZHONGWANG"
    题名 作者 年代 出处 被引量
1Demonstration of an ultra-low-threshold phonon laser with coupled microtoroid resonators in vacuum显示文摘We demonstrate an ultra-low-threshold phonon laser using a coupled-microtoroid-cavity system by introducing a novel coupling approach.The scheme exhibits both high optical quality factors and high mechanical quality factors.We have experimentally obtained the mechanical quality factor up to 18,000 in vacuum for a radialbreathing mode of 59.2 MHz.The measured phonon lasing threshold is as low as 1.2μW,which is~5 times lower than the previous result.GUANZHONGWANG MINGMING ZHAO YINGCHUN QIN ZHANGQI YIN XIAOSHUN JIANG MIN XIAO 2017Photonics Research2017,5,2:2
2Formation and Transport of Atomic Hydrogen in Hot-Filament Chemical Vapor Deposition Reactors显示文摘In this paper we focus on diamond film hot-filament chemical vapor deposition reactors where the only reactant ishydrogen so as to study the formation and transport of hydrogen atoms. Analysis of dimensionless numbers forheat and mass transfer reveals that thermal conduction and diffusion are the dominant mechanisms for gas-phaseheat and mass transfer, respectively. A simplified model has been established to simulate gas-phase temperature andH concentration distributions between the filament and the substrate. Examination of the relative importance ofhomogeneous and heterogeneous production of H atoms indicates that filament-surface decomposition of molecularhydrogen is the dominant source of H and gas-phase reaction plays a negligible role. The filament-surface dissociationrates of H2 for various filament temperatures were calculated to match H-atom concentrations observed in the liter-ature or derived from power consumption by filaments. Arrhenius plots of the filament-surface hydrogen dissociationrates suggest that dissociation of H2 at refractory filament surface is a catalytic process, which has a rather lowereffective activation energy than homogeneous thermal dissociation. Atomic hydrogen, acting as an important heattransfer medium to heat the substrate, can freely diffuse from the filament to the substrate without recombination.XueguiQI ZeshaoCHEN GuanzhongWANG 2003Journal of Materials Science & Technology2003,19,3:0
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