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传统民居色彩研究 被引量:5
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作者 李娟 刘业金 《绍兴文理学院学报》 2009年第8期62-65,106,共5页
针对传统民居色彩进行专项研究,试图通过一新的层面,即以民居色彩为一个整体效应来分析其形成因素和特征.依托四季色彩理论、色彩学、色彩地理学等相关学科,提出了色彩群理念,辨析了色彩群的内涵以及外延;并以不同的观察状态分析不同地... 针对传统民居色彩进行专项研究,试图通过一新的层面,即以民居色彩为一个整体效应来分析其形成因素和特征.依托四季色彩理论、色彩学、色彩地理学等相关学科,提出了色彩群理念,辨析了色彩群的内涵以及外延;并以不同的观察状态分析不同地域传统民居色彩群的特质. 展开更多
关键词 传统民居 色彩群 色调效应
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A High-Performance Silicon Electro-Optic Phase Modulator with a Triple MOS Capacitor 被引量:2
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作者 黄北举 陈弘达 +2 位作者 刘金彬 顾明 刘海军 《Journal of Semiconductors》 EI CAS CSCD 北大核心 2006年第12期2089-2093,共5页
We propose and analyze a novel Si-based electro-optic modulator with an improved metal-oxide-semiconductor (MOS) capacitor configuration integrated into silicon-on-insulator (SOl). Three gate-oxide layers embedded... We propose and analyze a novel Si-based electro-optic modulator with an improved metal-oxide-semiconductor (MOS) capacitor configuration integrated into silicon-on-insulator (SOl). Three gate-oxide layers embedded in the silicon waveguide constitute a triple MOS capacitor structure, which boosts the modulation efficiency compared with a single MOS capacitor. The simulation results demonstrate that the Vπ Lπ product is 2. 4V · cm. The rise time and fall time of the proposed device are calculated to be 80 and 40ps from the transient response curve, respectively,indicating a bandwidth of 8GHz. The phase shift efficiency and bandwidth can be enhanced by rib width scaling. 展开更多
关键词 carrier accumulation plasma dispersion effect electro-optic phase modulator METAL-OXIDE-SEMICONDUCTOR optoelectronic integrated circuit
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Analysis of Tonal Noise Generating Mechanisms in Low-Speed Axial-Flow Fans 被引量:2
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作者 Edward Canepa Andrea Cattanei Fabio Mazzocut Zecchin 《Journal of Thermal Science》 SCIE EI CAS CSCD 2016年第4期302-311,共10页
The present paper reports a comparison of experimental SPL spectral data related to the tonal noise generated by axial-flow fans.A nine blade rotor has been operated at free discharge conditions and in four geometrica... The present paper reports a comparison of experimental SPL spectral data related to the tonal noise generated by axial-flow fans.A nine blade rotor has been operated at free discharge conditions and in four geometrical configurations in which different kinds of tonal noise generating mechanisms are present:large-scale inlet turbulent structures,tip-gap flow,turbulent wakes,and rotor-stator interaction.The measurements have been taken in a hemi-anechoic chamber at constant rotational speed and,in order to vary the acoustic source strength,during low angular acceleration,linear speed ramps.In order to avoid erroneous quantitative evaluations if the acoustic propagation effects are not considered,the acoustic response functions of the different test configurations have been computed by means of the spectral decomposition method.Then,the properties of the tonal noise generating mechanisms have been studied.To this aim,the constant-Strouhal number SPL,obtained by means of measurements taken during the speed ramps,have been compared with the propagation function.Finally,the analysis of the phase of the acoustic pressure has allowed to distinguish between random and deterministic tonal noise generating mechanisms and to collect information about the presence of important propagation effects. 展开更多
关键词 Axial-flow fans Tonal noise Acoustic response
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