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铯分子亚稳电子态中高位振动态的产生和弛豫
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作者 程玉锋 栾楠 +4 位作者 蔡勤 张利平 戴康 王倩 沈异凡 《激光杂志》 CAS CSCD 北大核心 2011年第3期10-11,共2页
研究了Cs2〔13Πu(v)〕和Cs原子间的振动能量转移。利用激光感生荧光(LIF)探测Cs2〔13Πu(v)〕的弛豫过程,由时间分辨LIF的对数描绘得到振动态的有效寿命,从不同Cs原子密度下的有效寿命利用Stern-Volmer公式得到振动能级的弛豫率,速率... 研究了Cs2〔13Πu(v)〕和Cs原子间的振动能量转移。利用激光感生荧光(LIF)探测Cs2〔13Πu(v)〕的弛豫过程,由时间分辨LIF的对数描绘得到振动态的有效寿命,从不同Cs原子密度下的有效寿命利用Stern-Volmer公式得到振动能级的弛豫率,速率系数随v的增加而增大。从相邻二振动能级的布居密度之比得到振动弛豫速率常数kv,v-1。在高位振动态的传能过程中,多量子弛豫(Δv>1)是重要的。 展开更多
关键词 能量转移 高振动态 激光感生荧光 多量子弛豫 Cs2亚稳态
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用智慧和创造催发未来的种子
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作者 朱清时 《科技进步与对策》 北大核心 2001年第3期16-19,共4页
关键词 中国 科学院院士 朱清时 选键化学 分子高振动态研究
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Novel dynamic test system for simulating high-speed train moving on bridge under earthquake excitation 被引量:1
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作者 LIU Han-yun YU Zhi-wu +1 位作者 GUO Wei JIANG Li-zhong 《Journal of Central South University》 SCIE EI CAS CSCD 2022年第8期2485-2501,共17页
China’s high-speed railways are always facing the potential damage risk induced by strong earthquakes.And the route design concept of“using bridge instead of embankment”has also greatly increased the probability of... China’s high-speed railways are always facing the potential damage risk induced by strong earthquakes.And the route design concept of“using bridge instead of embankment”has also greatly increased the probability of high speed trains moving on bridges when a strong earthquake happens.In the past decades,a bunch of theoretical and numerical studies have been conducted in the seismic dynamic field of high-speed railway.However,the effective dynamic test system for verifying the given method and theoretical results is still lacking.Therefore,a novel dynamic test system(DTS)consisting of a shaking table array and a train-pass-bridge reduced-scale model is proposed in this paper.Through some crucial technical problems discussion,the effectiveness of similar design scheme and the feasibility of reduced-scale DTS are elaborated,and then the detailed DTS structures are given and displayed as part-by-part.On this basis,the demonstration tests are conducted and compared with the numerical simulation.The results show that the proposed DTS is accurate and effective.Therefore,the DTS can provide a new physical simulation approach to study the high-speed train’s running safety on bridges under earthquakes and can also provide a reference for the construction of related systems. 展开更多
关键词 strong earthquake high-speed train shaking table test dynamic test system similar design BRIDGE
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Distributed Discrimination of Strain and Temperature Based on Brillouin Dynamic Grating in an Optical Fiber 被引量:1
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作者 Kazuo HOTATE Weiwen ZOU +1 位作者 Rodrigo Kendy YAMASHITA Zuyuan HE 《Photonic Sensors》 SCIE EI CAS 2013年第4期332-344,共13页
This paper reviews distributed discrimination of strain and temperature by use of an optical fiber based on fiber optic nerve systems. The preliminary method based on multiple resonance peaks of the Brillouin gain spe... This paper reviews distributed discrimination of strain and temperature by use of an optical fiber based on fiber optic nerve systems. The preliminary method based on multiple resonance peaks of the Brillouin gain spectrum in a specially-designed fiber is firstly introduced. The complete discrimination of strain and temperature based on the Brillouin dynamic grating in a polarization maintaining fiber is extensively presented. The basic principle and two experimental schemes of distributed discrimination based on fiber optic nerve systems are demonstrated. The performance of the high discriminative accuracy (0.1 ~C-0.3 ~C and 5 kte-12~te) and high spatial resolution (-10 cm) with the effective measurement points of about 50 for a standard system configuration or about 1000 for a modified one will be highly expected in real industry applications. 展开更多
关键词 Fiber optic nerve systems Brillouin optical correlation-domain analysis Brillouin dynamic grating distributed discrimination strain temperature
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