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浏览/检索结果: 共9条,第1-9条 帮助

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Simulation of magnetic field effects on the MCP gain 会议论文  OAI收割
Giessen, GERMANY, 2019-09-11
作者:  
Li, L.;  Guo, L.;  Wei, Y.;  Sai, X.;  Liu, H.
  |  收藏  |  浏览/下载:39/0  |  提交时间:2020/05/15
Constraining the X-Ray-Infrared Spectral Index of Second-timescale Flares from SGR 1935+2154 with Palomar Gattini-IR 期刊论文  OAI收割
The Astrophysical Journal, 2020, 卷号: 901, 页码: L7
作者:  
HXMT
  |  收藏  |  浏览/下载:29/0  |  提交时间:2022/02/08
Radio transient sources  Magnetars  Soft gamma-ray repeaters  2008  992  1471  Astrophysics - High Energy Astrophysical Phenomena  Astrophysics - Instrumentation and Methods for Astrophysics  Abstract: The Galactic magnetar SGR 1935+2154 has been reported to produce the first example of a bright millisecond-duration radio burst (FRB 200428) similar to the cosmological population of fast radio bursts (FRBs). The detection of a coincident bright X-ray burst represents the first observed multiwavelength counterpart of an FRB. However, the search for similar emission at optical wavelengths has been hampered by the high inferred extinction on the line of sight. Here, we present results from the first search for second-timescale emission from the source at near-infrared (NIR) wavelengths using the Palomar Gattini-IR observing system in the J band, enabled by a novel detector readout mode that allows short exposure times of ?0.84 s with 99.9% observing efficiency. With a total observing time of ?12 hr (?47,728 images) during its 2020 outburst, we place median 3Ҡlimits on the second-timescale NIR fluence of ?18 Jy ms (13.1 AB mag). The corresponding extinction-corrected limit is ?125 Jy ms for an estimated extinction of AJ = 2.0 mag. Our observations were sensitive enough to easily detect an NIR counterpart of FRB 200428 if the NIR emission falls on the same power law as observed across its radio to X-ray spectrum. We report nondetection limits from epochs of four simultaneous X-ray bursts detected by the Insight-HXMT and NuSTAR telescopes during our observations. These limits provide the most stringent constraints to date on fluence of flares at 1014 Hz, and constrain the fluence ratio of the NIR emission to coincident X-ray bursts to RNIR ? 0.025 (fluence index ?0.35).  
Mo-al co-doped vo2(b) thin films: cvd synthesis, thermal sensitive properties, synchrotron radiation photoelectron and absorption spectroscopy study 期刊论文  iSwitch采集
Journal of alloys and compounds, 2018, 卷号: 745, 页码: 247-255
作者:  
Guo, Beibei;  Wan, Dongyun;  Wang, Jiaou;  Zhu, Sixv;  Luo, Hongjie
收藏  |  浏览/下载:200/0  |  提交时间:2019/04/23
Mo-Al co-doped VO2(B) thin films: CVD synthesis, thermal sensitive properties, synchrotron radiation photoelectron and absorption spectroscopy study 期刊论文  OAI收割
JOURNAL OF ALLOYS AND COMPOUNDS, 2018, 卷号: 745, 页码: 247-255
作者:  
Wang, JO;  Zhu, SX;  Luo, HJ;  Gao, YF;  Guo, BB
  |  收藏  |  浏览/下载:134/0  |  提交时间:2019/09/24
Large photocathode 20-inch PMT testing methods for the JUNO experiment 期刊论文  OAI收割
JOURNAL OF INSTRUMENTATION, 2017, 卷号: 12
作者:  
Anfimov, N
  |  收藏  |  浏览/下载:20/0  |  提交时间:2023/03/27
STEP mission: high-precision space astrometry to search for terrestrial exoplanets 期刊论文  OAI收割
JOURNAL OF INSTRUMENTATION, 2014, 卷号: 9, 页码: C04040
作者:  
Chen, D.
收藏  |  浏览/下载:59/0  |  提交时间:2014/07/14
Design of the infrared dual-band athermalized optical system based on HDE (EI CONFERENCE) 会议论文  OAI收割
International Symposium on Photoelectronic Detection and Imaging 2009: Advances in Infrared Imaging and Applications, June 17, 2009 - June 19, 2009, Beijing, China
作者:  
Zhang L.;  Sun Q.;  Wang H.;  Wang H.;  Wang H.
收藏  |  浏览/下载:99/0  |  提交时间:2013/03/25
Narcissus analysis for cooled staring IR system (EI CONFERENCE) 会议论文  OAI收割
3rd International Symposium on Advanced Optical Manufacturing and Testing Technologies, AOMATT 2007: Advanced Optical Manufacturing Technologies, July 8, 2007 - July 12, 2007, Chengdu, China
作者:  
Zhang X.;  Zhang X.
收藏  |  浏览/下载:27/0  |  提交时间:2013/03/25
Narcissus can have a deleterious effect on image quality for cooled infrared imaging systems. Therefore  analysis of narcissus is important for designing both scanning and staring optics. Narcissus is generally assumed to be negligible in staring IR optical designs because the shading effects can be removed by calibration of the detector array data. However  the calibration usually decreases sensitiveness of the system and Narcissus variation may be noticeable for sensors when the conditions changes as follows: 1. warming and cooling the optical housing  2. zooming optical elements  3. movement of lenses for focus. In that case  it will result in shading and other image defects even after calibration. To minimize these effects  narcissus should be assessed and controlled during the design of staring array IR system. We provided a direct and fast method for analyzing the narcissus variation in the presence of software such as LightTools  TracePro and ASAP  and proposed the principles in optical design of staring IR systems to reduce narcissus. A cooled staring IR system with serious narcissus was estimated and reoptimized. Narcissus analysis of this IR system confirmed the efficiency of the analysis method.  
Study on the characteristics of the High TcYBCO film as a mid-infrared detector by using IR FEL 期刊论文  OAI收割
JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS, 2002, 卷号: 41, 期号: SI1, 页码: #REF!
作者:  
Wang MK(王明凯);  Li YG(李永贵);  Fan YH(范耀辉);  Wang, MK;  Li, YG
收藏  |  浏览/下载:28/0  |  提交时间:2016/04/12