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保健食品中酸式结构洛伐他丁测定方法研究 被引量:2
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作者 杨大进 方从容 王竹天 《中国公共卫生》 CAS CSCD 北大核心 2004年第2期229-230,共2页
关键词 保健食品 酸式结构 洛伐他丁 测定方法 精密度
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Spontaneous emission rate and optical amplification of Er3+ in double slot waveguide
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作者 WANG XingJun JIANG LingJun +2 位作者 GUO RuiMin YE Rui ZHOU ZhiPing 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CAS CSCD 2015年第12期160-166,共7页
The spontaneous emission(SE) of Er3+ embedded in a double slot dielectric structure was studied by a quantum-electrodynamical formalism. The study shows that the slot width and the position of Er3+ in slot structure h... The spontaneous emission(SE) of Er3+ embedded in a double slot dielectric structure was studied by a quantum-electrodynamical formalism. The study shows that the slot width and the position of Er3+ in slot structure have a significant effect on the SE. The double slot waveguides were fabricated by embedding two low-index Er/Yb silicate material layers into high-index silicon. The radiative efficiency of Er3+ in the double slot waveguides is found to be higher than that of the single slot waveguide, which is consistent with the theory simulation. The 0.67 d B signal enhancement at 1.53 ?m in a 4.6-mm-long slot waveguide was observed pumped by 1476 nm laser. These results show the relevance of our model to study the SE processes in multilayer structures and are important for future realization of silicon-compatible active optical devices. 展开更多
关键词 slot waveguide spontaneous emission rate quantum efficiency
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Crystal structure of trans-3-phenyl-2-propenoic acid
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作者 Yucui Ma Liang Xu +1 位作者 Cui Wu Zhimao Chao 《Journal of Chinese Pharmaceutical Sciences》 CAS CSCD 2018年第9期644-648,共5页
The title compound of trans-3-phenyl-2-propenoic acid (C9H802), a main active organic acid of cinnamon bark and styrax, was obtained by oxidization from trans-3-phenyl-2-propenaldehyde and characterized by X-ray dif... The title compound of trans-3-phenyl-2-propenoic acid (C9H802), a main active organic acid of cinnamon bark and styrax, was obtained by oxidization from trans-3-phenyl-2-propenaldehyde and characterized by X-ray diffraction analysis. It crystallizes in monoclinic system, space group P21/n with a = 5.55916(10), b = 17.4870(3), c = 7.70677(13) A, V = 744.89(2) A3, Z= 4, Dc= 1.321 g/cm3, Mr = 148.15, F(000) = 312, and/t μ=0.764 mm-1. A total of 2661 reflections with 1447 unique ones (Rint = 0.0137) were collected, in which 1447 were observed (I〉2σ(/)). There were two C9H802 molecules in an asymmetric unit. The structural unit was a dimer formed by the hydrogen bonding of the oxygen atom of carbonyl group and the hydrogen atom of hydroxyl group. A 3D layer structure was formed through hydrogen bonds and Van der Walls' forces. 展开更多
关键词 trans-3-Phenyl-2-propenoic acid Crystal structure Organic acid Layer structure
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