中国科学院机构知识库网格系统: 检索

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	A New Solar Hard X-ray Image Reconstruction Algorithm for ASO-S/HXI Based on Deep Learning 期刊论文 OAI收割 SOLAR PHYSICS, 2024, 卷号: 299, 期号: 11 作者: Xia, Yuehan; Su, Yang; Liu H(刘辉); Yu, Wenhui; Li, Zhentong \| 收藏 \| 浏览/下载：5/0 \| 提交时间：2024/11/25 X-ray bursts Solar flares Machine learning Hard X-ray imaging
	Design of electronic system for 2D hard X-ray spectrum camera on EAST 期刊论文 OAI收割 FUSION ENGINEERING AND DESIGN, 2024, 卷号: 205 作者: Zhou, Run-Hui; Shen, Biao; Lin, Shi-Yao; Cao, Hong-Rui; Zhao, Jin-Long \| 收藏 \| 浏览/下载：3/0 \| 提交时间：2024/11/22 EAST Hard X-ray Energy spectrum 2D Imaging
	Investigation into energy conversion and distribution during brittle failure of hard rock 期刊论文 OAI收割 BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT, 2022, 卷号: 81, 期号: 3, 页码: 12 作者: Yang, Baicun; Xue, Lei; Duan, Yongting \| 收藏 \| 浏览/下载：31/0 \| 提交时间：2022/07/06 Energy conversion and distribution Brittle failure Hard rock X-ray micro-computed tomography
	Detection of Flare Multiperiodic Pulsations in Mid-ultraviolet Balmer Continuum, Lyl Hard X-Ray, and Radio Emissions Simultaneously 期刊论文 OAI收割 The Astrophysical Journal, 2021, 卷号: 921, 页码: 179 作者: HXMT \| 收藏 \| 浏览/下载：25/0 \| 提交时间：2022/02/08 Solar flares Solar oscillations Solar ultraviolet emission Solar x-ray emission Solar radio emission 1496 1515 1533 1536 1522 Astrophysics - Solar and Stellar Astrophysics Abstract: Quasi-periodic pulsations (QPPs), which usually appear as temporal pulsations of the total flux, are frequently detected in the light curves of solar/stellar flares. In this study, we present the investigation of nonstationary QPPs with multiple periods during the impulsive phase of a powerful flare on 2017 September 6, which were simultaneously measured by the Hard X-ray Modulation Telescope (Insight-HXMT), as well as the ground-based BLENSW. The multiple periods, detected by applying a wavelet transform and Lomb-Scargle periodogram to the detrended light curves, are found to be ~20-55 s in the Ly`and mid-ultraviolet Balmer continuum emissions during the flare impulsive phase. Similar QPPs with multiple periods are also found in the hard X-ray emission and low-frequency radio emission. Our observations suggest that the flare QPPs could be related to nonthermal electrons accelerated by the repeated energy release process, i.e., triggering of repetitive magnetic reconnection, while the multiple periods might be modulated by the sausage oscillation of hot plasma loops. For the multiperiodic pulsations, other generation mechanisms could not be completely ruled out.
	Design of flexure support for high-precision base plates on Hard X-ray Imager 会议论文 OAI收割 Beijing, PEOPLES R CHINA, 2020-11-30 作者: Zhang Feiyang; Li Fu \| 收藏 \| 浏览/下载：13/0 \| 提交时间：2021/06/04 Flexure support Finite element analysis Thermal stability Materials Mechanics Hard X-ray
	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：44/0 \| 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 distances^1-3. It has long been speculated that magnetars are the engine powering repeating bursts from FRB sources^4-13, 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 flare^18-21. 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.
	Introducing a special collection of papers in the Journal of High Energy Astrophysics on the Early Results of China's 1st X-ray Astronomy Satellite: Insight-HXMT 期刊论文 OAI收割 Journal of High Energy Astrophysics, 2020, 卷号: 27, 页码: 51-52 作者: HXMT \| 收藏 \| 浏览/下载：51/0 \| 提交时间：2022/02/08 Astrophysics - High Energy Astrophysical Phenomena Abstract: Insight-HXMT is the first Chinese X-ray astronomical mission, launched successfully on June 15, 2017, from China's Jiuquan Satellite Launch Center. Insight-HXMT was designed to have a broad energy coverage in X-rays, from 1-250 keV, with excellent timing and adequate energy resolution at soft X-rays, and the largest effective area at hard X-rays. This allows, in particular, to observe bright sources like X-ray binaries (XRBs) in their bright/outburst states with high cadence and high statistics at hard and soft X-rays at once. It was then expected that the Insight-HXMT mission will bring us new insights regarding the characteristics of several source classes. Examples include characterizing High-Mass X-ray Binaries (HMXBs) and the outburst evolution of Low-Mass X-ray Binaries (LMXBs). For instance, in HMXB systems, the region around their Alfven radius that is responsible to determine whether accretion or propeller occurs, or the region around the NS magnetic pole where the intense X-rays are supposed to be produced are specially appealing targets of study. For the LMXBs, the evolution the outburst and the properties of the compact objects themselves are obvious priority targets for Insight-HXMT. Due to the broad coverage in energy, Insight-HXMT is specially well suited to study the influence of thermonuclear (type-I) X-ray bursts upon the surrounding environment.
	Spectrometer of hard X-ray imager payload onboard the ASO-S mission 期刊论文 OAI收割 NUCLEAR SCIENCE AND TECHNIQUES, 2019, 卷号: 30, 期号: 8, 页码: 8 作者: Zhang, Yan; Guo, Jian-Hua; Zhang, Zhe; Chen, Deng-Yi; Hu, Yi-Ming \| 收藏 \| 浏览/下载：70/0 \| 提交时间：2019/09/26 Solar radiation detection X-ray spectrometer Hard X-ray imager ASO-S
	High-resolution pixelated CdZnTe detector prototype system for solar hard X-ray imager 期刊论文 OAI收割 NUCLEAR SCIENCE AND TECHNIQUES, 2019, 卷号: 30, 期号: 3, 页码: 6 作者: Wang, Shen; Guo, Jian-Hua; Zhang, Yan; Chen, Wei \| 收藏 \| 浏览/下载：44/0 \| 提交时间：2019/05/16 CdZnTe Readout system Solar observation Hard X-ray imager