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浏览/检索结果: 共67条，第1-10条 帮助 条数/页： 5101520253035404550556065707580859095100 排序方式： 请选择提交时间升序提交时间降序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 Influence of Rare-Earth Promoters (Ce, Zr and La) on Catalytic Performance of Copper-Based Catalyst in Toluene Oxidation 期刊论文  OAI收割 COMBUSTION SCIENCE AND TECHNOLOGY, 2023, 页码: 19 作者:  Hu, Guangtao;  Zhang, Zirui;  Wang, Chang'an;  Li, Guojie;  Zhou, Dandan   |  收藏  |  浏览/下载：44/0  |  提交时间：2024/01/08 Copper  rare-earth  VOCs oxidation  toluene  IR spectra   Raman Spectroscopic and Theoretical Study of Scandium Fluoride and Oxyfluoride Anions in Molten FLiNaK 期刊论文  OAI收割 JOURNAL OF PHYSICAL CHEMISTRY B, 2020, 卷号: 124, 期号: 30, 页码: 6671-6678 作者:  Wang, CY;  Chen, XT;  Wei, R;  Gong, Y   |  收藏  |  浏览/下载：35/0  |  提交时间：2021/09/06 DENSITY-FUNCTIONAL THEORY  HIGH-TEMPERATURE NMR  BIS(TRIFLUOROMETHANESULFONYL) IMIDE ANION  IONIC LIQUID  VIBRATIONAL-SPECTRA  RARE-EARTH  MOLECULAR-DYNAMICS  LOCAL-STRUCTURE  BINARY MELTS  BASIS-SET   Rare Object Search From Low-S/N Stellar Spectra in SDSS 期刊论文  OAI收割 IEEE ACCESS, 2020, 卷号: 8, 页码: 66475-66488 作者:  Wu, Minglei;  Pan, Jingchang;  Yi, Zhenping;  Wei, Peng   |  收藏  |  浏览/下载：25/0  |  提交时间：2021/12/06 Principal component analysis  Search problems  Astronomy  Support vector machines  Wavelength division multiplexing  Feature extraction  Random forests  SDSS  stellar spectra  machine learning  rare object search   No pulsed radio emission during a bursting phase of a Galactic magnetar 期刊论文  OAI收割 Nature, 2020, 卷号: 587, 页码: 63-65 作者:  HXMT   |  收藏  |  浏览/下载：61/0  |  提交时间：2022/02/08 Astrophysics - High Energy Astrophysical Phenomena  Abstract: Fast radio bursts (FRBs) are millisecond-duration radio transients of unknown physical origin observed at extragalactic distances1-3. It has long been speculated that magnetars are the engine powering repeating bursts from FRB sources4-13, but no convincing evidence has been collected so far14. Recently, the Galactic magnetar SRG 1935+2154 entered an active phase by emitting intense soft íray bursts15. One FRB-like event with two peaks (FRB 200428) and a luminosity slightly lower than the faintest extragalactic FRBs was detected from the source, in association with a soft íray/hard-X-ray flare18-21. Here we report an eight-hour targeted radio observational campaign comprising four sessions and assisted by multi-wavelength (optical and hard-X-ray) data. During the third session, 29 soft-íray repeater (SGR) bursts were detected in íray energies. Throughout the observing period, we detected no single dispersed pulsed emission coincident with the arrivals of SGR bursts, but unfortunately we were not observing when the FRB was detected. The non-detection places a fluence upper limit that is eight orders of magnitude lower than the fluence of FRB 200428. Our results suggest that FRB-SGR burst associations are rare. FRBs may be highly relativistic and geometrically beamed, or FRB-like events associated with SGR bursts may have narrow spectra and characteristic frequencies outside the observed band. It is also possible that the physical conditions required to achieve coherent radiation in SGR bursts are difficult to satisfy, and that only under extreme conditions could an FRB be associated with an SGR burst.   Crystal growth and photoluminescence spectra properties of (YbxNdySc1-x-y)(2)SiO5 laser crystal 期刊论文  OAI收割 LASER PHYSICS LETTERS, 2018, 卷号: 15, 期号: 8 作者:     |  收藏  |  浏览/下载：68/0  |  提交时间：2018/12/28 ytterbium  laser crystal  rare-earth-doped materials  spectra properties   Highly efficient continuous-wave laser operation of LD-pumped Nd, Gd:CaF2 and Nd, Y:CaF2 crystals 期刊论文  OAI收割 LASER PHYSICS LETTERS, 2018, 卷号: 15, 期号: 5 作者:  Pang, Siyuan;  Ma, Fengkai;  Yu, Hao;  Qian, Xiaobo;  Jiang, Dapeng   |  收藏  |  浏览/下载：49/0  |  提交时间：2018/12/28 Nd:CaF2  laser crystal  rare-earth ions co-doping  spectra properties   Anomalous compression behaviour in Nd2O3 studied by x-ray diffraction and Raman spectroscopy 期刊论文  OAI收割 AIP ADVANCES, 2018, 卷号: 8, 期号: 2, 页码: - 作者:  Jiang, S;  Liu, J;  Bai, LG   |  收藏  |  浏览/下载：42/0  |  提交时间：2018/09/06 Rare-earth Sesquioxides  High-pressure  Phase-transition  Ab-initio  Vibrational-spectra  Transformation  Deposition  Crystals  Er2o3  Films   Distinguishing the Rare Spectra with the Unbalanced Classification Method Based on Mutual Information 期刊论文  OAI收割 SPECTROSCOPY AND SPECTRAL ANALYSIS, 2016, 卷号: 36, 期号: 11, 页码: 3746-3751 作者:  Liu Zhong-bao;  Ren Juan-juan;  Kong Xiao 收藏  |  浏览/下载：39/0  |  提交时间：2017/03/01 Unbalanced classification  Mutual information  Rare spectra  Decision tree   Reduction of Eu3+ due to a change of the topological structure of the BO3 unit in borate glass 期刊论文  OAI收割 dalton transactions, 2015, 卷号: 44, 期号: 41, 页码: 17916-17919 作者:  Zhang,Su;  Pang,Ran;  Li,Da;  Fu,Jipeng;  Jia,Yonglei 收藏  |  浏览/下载：126/0  |  提交时间：2016/05/12 CRYSTALLINE STRONTIUM TETRABORATE  RARE-EARTH IONS  VIBRATIONAL-SPECTRA  OPTICAL-PROPERTIES  VALENCE CHANGE  AIR  PHOSPHOR  LIGHT  RAMAN  EU2+   Investigation on Luminescence Properties of a Long Afterglow Phosphor Ca2SnO4:Tm3+ 期刊论文  OAI收割 chemistry-an asian journal, 2015, 卷号: 10, 期号: 11, 页码: 2361-2367 作者:  Li,Hai-Feng;  Sun,Wen-Zhi;  Jia,Yong-Lei;  Ma,Teng-Fei;  Fu,Ji-Peng 收藏  |  浏览/下载：51/0  |  提交时间：2016/05/13 RARE-EARTH IONS  LASTING PHOSPHORESCENCE  PERSISTENT LUMINESCENCE  ZINC PYROPHOSPHATE  ENERGY-TRANSFER  THERMOLUMINESCENCE  DY3+  KINETICS  SPECTRA  GLASSES