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浏览/检索结果: 共13条，第1-10条 帮助

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GRANDMA and HXMT Observations of GRB 221009A: The Standard Luminosity Afterglow of a Hyperluminous Gamma-Ray Burst-In Gedenken an David Alexander Kann 期刊论文  OAI收割
Astrophysical Journal Letters, 2023, 卷号: 948, 期号: 2, 页码: L12
作者:  Kann, D. A.;  Agayeva, S.;  Aivazyan, V.;  Alishov, S.;  Andrade, C. M.
  |  收藏  |  浏览/下载：3/0  |  提交时间：2024/06/23
The study of 11 contact binaries with mass ratios less than 0.1 期刊论文  OAI收割
Monthly Notices of the Royal Astronomical Society, 2023, 卷号: 519, 期号: 4, 页码: 5760-5774
作者:  Liu, Xin-Yi;  Li, Kai;  Michel, Raul;  Gao, Xiang;  Gao, Xing
  |  收藏  |  浏览/下载：2/0  |  提交时间：2024/06/23
The first photometric investigation of the contact binary OQ Cam 期刊论文  OAI收割
Research in Astronomy and Astrophysics, 2020, 卷号: 20, 期号: 11, 页码: 179
作者:  Guo, Ya-Ni;  Li, Kai;  Xia, Qi-Qi;  Gao, Xing;  Jiang, Lin-Qiao
  |  收藏  |  浏览/下载：38/0  |  提交时间：2021/06/25
Synthesis of cross-linked polymers via multi-component Passerini reaction and their application as efficient photocatalysts 期刊论文  OAI收割
rsc advances, 2014, 卷号: 4, 期号: 48, 页码: 25114-25117
Lin, Wenhai; Sun, Tingting; Zheng, Min; Xie,Zhigang; Huang,Yubin; Jing,Xiabin
收藏  |  浏览/下载：30/0  |  提交时间：2015/10/19
Unexpected Propeller-Like Hexakis(fluoren-2-yl)benzene Cores for Six-Arm Star-Shaped Oligofluorenes: Highly Efficient Deep-Blue Fluorescent Emitters and Good Hole-Transporting Materials 期刊论文  OAI收割
ADVANCED FUNCTIONAL MATERIALS, 2013, 卷号: 23, 期号: 14, 页码: 1781-1788
作者:  Zou, Yang;  Zou, Jianhua;  Ye, Tengling;  Li, Hao;  Yang, Chuluo
  |  收藏  |  浏览/下载：34/0  |  提交时间：2019/04/09
Synthesis and Optoelectronic Properties of Blue-Emitting Star-Burst Oligomers Based on Triphenylamine and Spiro(fluorene-9,9 '-xanthene) 期刊论文  OAI收割
ACTA PHYSICO-CHIMICA SINICA, 2012, 卷号: 28, 期号: 8, 页码: 2000-2007
作者:  Chu Zeng-Ze;  Wang Dan;  Zhang Chao;  Zou De-Chun
  |  收藏  |  浏览/下载：18/0  |  提交时间：2019/04/09
High accuracy star image locating and imaging calibration for star sensor technology (EI CONFERENCE) 会议论文  OAI收割
6th International Symposium on Precision Engineering Measurements and Instrumentation, August 8, 2010 - August 11, 2010, Hangzhou, China
作者:  Wang Y.;  Wang Y.;  Wang Y.;  Wang Y.;  Wang Y.
收藏  |  浏览/下载：27/0  |  提交时间：2013/03/25
Today aircraft attitude measurement technology plays an important role in an aircraft system because it can provide orientation for aircraft in action. Lately star sensor technology used in aircraft attitude measurement has become more and more popular because of its high accuracy  light weight  without attitude accumulation errors and other advantages. There are three main steps for star sensor to measure aircraft attitude  star image locating  star identification and attitude tracking. The latter two steps are based on the accuracy of star image locating. So it's critical to make efforts to advance the accuracy of star image locating. Some imaging errors  such as spherical aberration or coma aberration  also have negative effect on the accuracy of star image locating  of which the effect is necessarily reduced as well. At the beginning of this article  the structure of star sensor hardware is introduced. Secondly three methods for star image locating are described specifically  which are traditional centroid method  Gauss quadric fitting method and improved Gauss quadric fitting method. Subsequently an imaging calibration method is described for the purpose of reducing the effect of imaging errors. Finally the experiment shows that the accuracy of the star sensor is 2-arc-second. 2010 SPIE.  
Design of high precision star image locating method used in star sensor technology (EI CONFERENCE) 会议论文  OAI收割
2010 International Conference on Computer, Mechatronics, Control and Electronic Engineering, CMCE 2010, August 24, 2010 - August 26, 2010, Changchun, China
作者:  Sun H.;  Wang Y.;  Wang Y.;  Wang Y.;  Wang Y.
收藏  |  浏览/下载：57/0  |  提交时间：2013/03/25
Nowadays star sensor technology used in aircraft attitude measurement has become more and more popular for its high precision  light weight  without attitude accumulation errors and other advantages. In order to enhance the accuracy of star sensor  it is critical to make efforts to promote the precision of star image locating. High precision star image locating method mentioned in this article includes two aspects. One is sub-pixel dividing algorithm used to acquire the coordinate of stars. The other one is imaging calibration method used to weaken the effect caused by imaging distortion. This method is finally realized in some type of star sensor system. Then an experiment is designed to verify the precision of the method. The result of the experiment shows that the precision of the method is 2" in the experimental environment. 2010 IEEE.  
The calibration of faint simulation star magnitude based on single photon count technique (EI CONFERENCE) 会议论文  OAI收割
International Symposium on Photoelectronic Detection and Imaging 2009: Advances in Imaging Detectors and Applications, June 17, 2009 - June 19, 2009, Beijing, China
作者:  Xu S.-Y.;  Guo J.;  Guo J.
收藏  |  浏览/下载：40/0  |  提交时间：2013/03/25
A calibration method of faint star magnitude of the star scene simulation device is proposed in this paper. In the research of simulation star magnitude  luminometers and CCD devices are the general calibration devices which are used to measure the illumination intensity and calibrate its magnitude. But if the simulation magnitude is only sixth magnitude  its illumination intensity is only 1.010-8 Lux. This illumination intensity level is the lowest illumination intensity that the commercial luminometer can detect. Hence the simulation star magnitude lower than six magnitude cannot be calibrated by luminoters. Likewise CCD devices also need an additive cooler in this case. When the single photon characteristic is presented due to the low luminosity of simulating light sources  the simulation star magnitude can be calibrated by detecting its photon flux of radiation with the method of single photon count. In this paper the detection principle of single photon based on a compact designed PMT detecting of the radiation level of simulation star magnitude is advanced. Especially a spectrum match method is proved theoretically to be an effective means for selecting PMT photosensitive type. In the case of the detection object of the simulation star in visible wavelength  a analysis indicates that the material of tri-alkali cathode materials its best choice after being compared the Signal-to-Noise of photon detector of several PMT photosensitive materials based on the different spectrum match ratio of different object light sources and different cathode materials. An experiment is employed to show the relationship of control voltage of PMT and its dark counter  the relationship of the environment temperature of PMT and its dark counter  which proves its only decades of CPS at room temperature. The so low dark counter avoids a bulky cooler and is convenient for installing it on the star scene simulation equipment. Finally in the experiment of calibrating the simulation star magnitudes the ability of its calibration is confirmed to reaches up to 12m  meanwhile its calibration error is within 0.2m. 2009 SPIE.  
Hyperbranched polymer-cored star polyfluorenes as blue light-emitting materials 期刊论文  OAI收割
CHINESE SCIENCE BULLETIN, 2008, 卷号: 53, 期号: 18, 页码: 2770-2776
作者:  Han Yang;  Sun MingHao;  Fei ZhuPing;  Bo ZhiShan
  |  收藏  |  浏览/下载：18/0  |  提交时间：2019/04/09