机构

• 长春光学精密机械与物... [2]
• 地质与地球物理研究所 [1]
• 上海药物研究所 [1]

采集方式

• OAI收割 [4]

内容类型

• 会议论文 [2]
• 期刊论文 [2]

发表日期

• 2016 [1]
• 2007 [1]
• 2006 [1]
• 2001 [1]

学科主题

筛选

浏览/检索结果: 共4条，第1-4条 帮助 条数/页： 5101520253035404550556065707580859095100 排序方式： 请选择题名升序题名降序提交时间升序提交时间降序作者升序作者降序发表日期升序发表日期降序 Local time dependence of ionospheric equinoctial asymmetry 期刊论文  OAI收割 CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION, 2016, 卷号: 59, 期号: 11, 页码: 3941-3954 作者:  Liu Yong;  Chen Yi-Ding;  Liu Li-Bo   |  收藏  |  浏览/下载：28/0  |  提交时间：2017/11/21 f(o)F(2)  f(o)E  GPS TEC  Ionosphere  Equinoctial asymmetry   Mechanisms of energy transfer in Pr3+ and Cr3+ codoped SrAl12O19 phosphor (EI CONFERENCE) 会议论文  OAI收割 209th ECS Meeting, May 7, 2006 - May 12, 2006, Denver, CO, United states 作者:  Zhang J.;  Wang X.-J.;  Zhang G.;  Zhang G.;  Zhang G. 收藏  |  浏览/下载：20/0  |  提交时间：2013/03/25 A two-step energy transfer was observed in Pr3+ and Cr 3+ codoped SrAl12O19 phosphor  which results in a two-photon luminescence for one UV/vacuum-UV photon absorbed. For one Pr 3+ ion excited to the lowest 4f5d states  two Cr3+ ions may be excited and emit two red photons due to 2E- 4A2 transitions of the Cr3+ ions  Cr 3+ ions can be excited into the 4T1(F) levels by cross relaxation of Pr3+ 1S0- 1I6 or by direct energy transfer from Pr3+ 3P0  1 states. The mechanisms of the two-step energy transfer process were studied based on spectra and lifetime measurements. copyright The Electrochemical Society.   Energy transfer and red phosphorescence in strontium aluminates doped with Cr3+, Eu2+ and Dy3+ (EI CONFERENCE) 会议论文  OAI收割 Dielectrics in Emerging Technologies -and- Persistent Phosphors - International Symposia, May 15, 2005 - May 20, 2005, Quebec City, QC, Canada 作者:  Wang X.;  Wang X.;  Wang X.;  Zhang X.;  Zhang X. 收藏  |  浏览/下载：30/0  |  提交时间：2013/03/25 Cr3+ activated red (694 nm) long persistent phosphorescence originating from 2E-4A2 transition is observed in 4SrO·7Al2O3: Cr3+  Eu2+  Dy3+ system. It is demonstrated that the red phosphorescence is resulted from the conversion of Eu2+ activated blue phosphorescence through persistence energy transfer from Eu2+ to Cr3+. The excitation spectra of the 694 nm emission exhibit strong f-d band of Eu 2+  indicating the existence of the energy transfer. The dependence of lifetimes and intensities of the red and blue emissions on Cr3+ concentrations are studied. The intensity ratio of the red to blue emission bands obtained from photoluminescence spectra is in good agreement with that obtained from fluorescence lifetime measurements. The decay curves of the red phosphorescence at 694nm are also studied.   Mass spectroscopic studies on some lycopodium alkaloids 期刊论文  OAI收割 CHINESE JOURNAL OF ORGANIC CHEMISTRY, 2001, 卷号: 21, 期号: 8, 页码: 606-610 作者:  Wang, BD;  Wang, J;  Sun, HF;  Zhu, DY   |  收藏  |  浏览/下载：19/0  |  提交时间：2019/01/08 mass  lycopodium alkaloids  huprezine E  huprezine F  huprezine G  huprezine O