中国科学院机构知识库网格系统: 检索

The Giant Radio Array for Neutrino Detection (GRAND): Science and design 期刊论文 OAI收割
SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY, 2020, 卷号: 63, 期号: 1, 页码: 43
作者: Alvarez-Muniz, Jaime; Batista, Rafael Alves; Balagopal, Aswathi, V; Bolmont, Julien; Bustamante, Mauricio

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radio telescopes neutrinos in astronomical observations cosmic rays in astronomical observations radiowave radiation: sources galactic and extragalactic cosmic rays: galactic and extragalactic

Comparison of simulated backgrounds with in-orbit observations for HE, ME, and LE onboard Insight-HXMT 期刊论文 OAI收割
Astrophysics and Space Science, 2020, 卷号: 365, 页码: 158
作者: HXMT

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收藏 | 浏览/下载：53/0 | 提交时间：2022/02/08

Insight-HXMT Geant4 simulation Background observation Astrophysics - Instrumentation and Methods for Astrophysics Abstract: Insight-HXMT, the first X-ray astronomical satellite in China, aims to reveal new sources in the Galaxy and to study fundamental physics of X-ray binaries from 1 to 250 keV. It has three collimated telescopes, the High Energy X-ray telescope (HE), the Medium Energy X-ray telescope (ME), and the Low Energy X-ray telescope (LE). Before the launch, in-orbit backgrounds of these three telescopes had been estimated through Geant4 simulation, in order to investigate the instrument performance and the achievement of scientific goals. In this work, these simulated backgrounds are compared with in-orbit observations. Good agreements are shown for all three telescopes. For HE, (1) the deviation of the simulated background rate after two years of operation in space is 5 % from the observation (2) the total background spectrum and the relative abundance of the 67 keV line show long-term increases both in simulations and observations. For ME, (1) the deviation of simulated background rate is within 15 % from the observation, and (2) there are no obvious long-term increase features in the background spectra of simulations and observations. For LE, the background level given by simulations is also consistent with observations. The consistencies of these comparisons validate that the Insight-HXMT mass model, i.e., space environment components and models adopted, physics processes selected, and detector constructions built, is reasonable. However, the line features at 7.5 and 8.0 keV, which are obvious in the observed spectra of LE, are not evident in simulations. This might result from uncertainties in the LE constructions.

Commissioning progress of the FAST 期刊论文 OAI收割
SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY, 2019, 卷号: 62, 期号: 5, 页码: 22
作者: Jiang, Peng; Yue, YouLing; Gan, HengQian; Yao, Rui; Li, Hui

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收藏 | 浏览/下载：30/0 | 提交时间：2020/03/10

radio telescopes and instrumentation astronomical observations radio wave receivers algorithms and implementation control systems

Comparison between the time-integrated spectrum and the peak time spectrum of gamma-ray bursts and possible implications 期刊论文 OAI收割
SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY, 2015, 卷号: 58, 期号: 3, 页码: 39501
作者: Lyu Fen; Wang YuanZhu; Liang YunFeng; Lin TingTing; Hu YouDong

收藏 | 浏览/下载：43/0 | 提交时间：2015/12/03

gamma-ray sources gamma-ray bursts gamma-rays: astronomical observations

Comparison between the time-integrated spectrum and the peak time spectrum of gamma-ray bursts and possible implications 期刊论文 OAI收割
SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY, 2015, 卷号: 58, 期号: 3
作者: Lyu Fen; Wang YuanZhu; Liang YunFeng; Lin TingTing; Hu YouDong

收藏 | 浏览/下载：42/0 | 提交时间：2016/05/18

gamma-ray sources gamma-ray bursts gamma-rays: astronomical observations

Simultaneous multicolor photometry of fast-moving objects using the 1-meter telescope at Xinglong Observatory 期刊论文 OAI收割
SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY, 2014, 卷号: 57, 期号: 3, 页码: 562-568
作者: Mao YongNa; Lu XiaoMeng; Wang JianFeng

收藏 | 浏览/下载：30/0 | 提交时间：2016/11/28

fast-moving celestial objects simultaneous multicolor observations astronomical telescope

Status of the first Antarctic Survey Telescopes for Dome A 会议论文 OAI收割
Amsterdam, Netherlands, 2012-7-1
作者: Daxing Wang; Xiangqun Cui; Xiangyan Yuan; Xuefei Gong; Lingzhe Xu

收藏 | 浏览/下载：58/0 | 提交时间：2014/01/09

Astronomical site Dome A Antarctica Survey Telescope Automatic observations

The state of the art for liquid crystal adaptive optics in astronomical applications (EI CONFERENCE) 会议论文 OAI收割
2012 International Conference on Optoelectronics and Microelectronics, ICOM 2012, August 23, 2012 - August 25, 2012, Changchun, China
作者: Liu Y.; Liu Y.; Xuan L.; Liu Y.

收藏 | 浏览/下载：28/0 | 提交时间：2013/03/25

In this paper we summarize the researches of liquid crystal (LC) adaptive optics(AO) in astronomical applications. Dual frequency and nematic LC materials were reported to be used in astronomical observations. However nematic LC with its simple producing and driving method and multi-gray-level is promising in the application. We have investigated the nematic LC AO system and promoted its application for nearly ten years. Here we reported our newest nematic LC AO system with bandwidth result of 3dB is 54.4 Hz 0dB bandwidth is 79.1Hz. 2012 IEEE.

Research on the support structure of the primary mirror of large-aperture telescope (EI CONFERENCE) 会议论文 OAI收割
3rd International Symposium on Advanced Optical Manufacturing and Testing Technologies, AOMATT 2007: Large Mirrors and Telescopes, July 8, 2007 - July 12, 2007, Chengdu, China
Yang W.; Jingxu Z.

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Large-aperture telescope can be used in surveying battlefield researching landform searching object real-time monitoring imaging detecting and identifying spatial targets and so on. A large-aperture telescope for achieving high resolution power is designed to monitor spatial target and image in real time. Real-time monitoring plays an important role in military conflicts. The orbit parameter of object quantity geometrical shape parameter and so on can be obtained by detect spatial target. With the development of optical technology people require larger aperture in optics-electronic (OE) system. By increasing optical aperture the ability of collecting light and resolution power in the system can be enhanced. But the support structure of the primary mirror of large-aperture telescope will be a very difficult problem. With the increase of primary mirror aperture the weight of the primary mirror will become larger than before. The root mean square (rms) of the primary mirror is affected by many factors such as deadweight deformation of heat environment and so on. Due to the primary mirror of telescope is an important component of telescope system. By reducing the weight of primary mirror precision of the system is ensured. During the designing phase one can consider the supporting project of the primary mirror synthetically and analyze it roundly according to technical requirement of optical system and the effect factors. The final structural design can be reasonable. In an astronomical telescope the surface of reflector is an important part for collecting dark radiation of celestial bodies. Its surface shape will have an effect on collecting efficiency of telescope radiant energy directly. So the rms must be very high. Optical system of large aperture small wavelength and small focus can receive maximal light intensity. For ground-based optical astronomical telescope the design proposed in the paper can satisfy the requirement of the possible minimum atmosphere seeing at astronomical observatory site and exert the use efficiency of the telescope adequately. So the accuracy of the traditional surface of reflector can assure that 90% of all the light energy can be focused on within the angle diameter range of the minimum atmosphere seeing then 100% of light energy should be focused on the angle diameter range of minimum atmosphere seeing. Because the rms of mirror is very high precise surface machining and accurate the support of mirror are very important tasks during designing and manufacturing the telescope. In the paper various support techniques of a large-aperture telescope primary mirror are discussed and a 3.5 meter telescope system at the Starfire Optical Range (SOR) overviewed simply which was operated by the Directed Energy Directorate of the Air Force Research Laboratory Kirtland AFB NM USA from the ground-based O-E system for the observations of spatial target. We also analyze Theoretical elastic deformation of the Steward Observatory 2.3 meter mirror is analyzed.

Approaches to convergence enhancement of multiframe blind deconvolution of astronomical images 期刊论文 OAI收割
ACTA PHYSICA SINICA, 2006, 卷号: 55, 期号: 12, 页码: 6708-6714
作者: Luo Lin; Wang Li; Cheng Wei-Dong; Shen Mang-Zuo

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atmospheric optics astronomical observations image processing and restoration