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浏览/检索结果: 共6条，第1-6条 帮助 限定条件 内容类型：会议论文     已选(0)清除 条数/页：5101520253035404550556065707580859095100   排序方式：请选择作者升序作者降序题名升序题名降序发表日期升序发表日期降序提交时间升序提交时间降序 Synthesis and luminescence properties of Eu3+-doped silicate nanomaterial (EI CONFERENCE) 会议论文 17th International Conference on Dynamical Processes in Excited States of Solids, DPC'10, June 20, 2010 - June 25, 2010, Argonne, IL, United states Lu S.; Zhang J.; Zhang J. 收藏  |  浏览/下载：24/0  |  提交时间：2013/03/25 In this paper  we introduce a sol-gel process for preparing Y 2Si2O7: Eu3+ nanocrystals. The rare earth compounds were dispersed in the SiO2 colloids and the monodisperse nano-scale composite materials were prepared. The reactant mass fraction and heat treatment temperatures could affect the structures and emission spectrum properties of as-synthesized samples. The samples emit the strong red light upon excitation under the ultraviolet. The main peaks originate from 5D0-7F2 electric dipole transition of Eu3+. With regard to the samples treated at different temperatures  the emission spectra obtained under 266 nm excitation show different shapes of spectra lines and relative intensities  indicating that the Eu3+ ions have been located in different local environments. 2011 Published by Elsevier B.V.   Dynamic Characteristics of Base-isolated RC Frame Structures under Ambient Excitation 会议论文 作者:  Han, Jianping;  Wang, Hongtao;  Liu, Yurtshuai;  Luo, Weigang 收藏  |  浏览/下载：8/0  |  提交时间：2019/11/15 based-isolated building  dynamic characteristics  ambient excitation  modal parameter identification  multi-objective optimization   Dynamic characteristics of base-isolated RC frame structures under ambient excitation 会议论文 Chengdu, China, October 20, 2011 - October 22, 2011 作者:  Han, Jianping;  Wang, Hongtao;  Liu, Yunshuai;  Luo, Weigang 收藏  |  浏览/下载：8/0  |  提交时间：2020/11/15 Bridge decks  Damping  Inverse problems  Modal analysis  Multiobjective optimization  Stiffness  Stochastic systems  Structural frames  Structural panels  Vibration analysis  Ambient excitation  Base isolated structure  Damping characteristics  Dynamic characteristics  Frequently occurred earthquakes  Isolated buildings  Modal parameter identification  Stochastic subspace identification   Cellular localization and quantification of bioactive alkaloids hymenialdisine and debromohymenialdisine in marine sponge Axinella sp. 会议论文 13th international biotechnology symposium and exhibition, 中国, 2008-10-12 宋悦凡; 曹旭鹏; 张卫 收藏  |  浏览/下载：11/0  |  提交时间：2011/07/11 Coupling of riber-waveguide amplifier 会议论文 Conference on Optoelectronic Devices and Integration, Beijing, PEOPLES R CHINA, 2004-11-08 作者:  Li, SF;  Song, CL;  Li, CR;  Wang, WC;  Li, JY 收藏  |  浏览/下载：2/0  |  提交时间：2020/01/02 coupling  Er-doped waveguide amplifier  excitation fraction  gain   Theoretical model of Er-doped Al2O3 waveguide amplifier 会议论文 Conference on Optical Design and Testing, SHANGHAI, PEOPLES R CHINA 作者:  Li, SF;  Song, CL;  Li, CG;  Rao, WX 收藏  |  浏览/下载：2/0  |  提交时间：2020/01/02 Er-doped waveguide amplifier  finite element method  mode distribution  excitation fraction