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浏览/检索结果: 共110条，第1-10条 帮助

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γ射线辐照对Cr掺杂MgAl_2O_4晶体光谱特征的影响 期刊论文  OAI收割
量子电子学报, 2023, 卷号: 40
作者:  孙贵花;  张庆礼;  罗建乔;  高进云;  刘文鹏
  |  收藏  |  浏览/下载：4/0  |  提交时间：2023/11/10
Spin-triplet pairing induced by near-neighbor attraction in the extended Hubbard model for cuprate chain 期刊论文  OAI收割
COMMUNICATIONS PHYSICS, 2022, 卷号: 5, 期号: 1, 页码: 257
作者:  
  |  收藏  |  浏览/下载：17/0  |  提交时间：2023/01/16
Effect of Tm3+ concentration on structure, defect, and spectral properties of Tm: YAP crystals 期刊论文  OAI收割
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING, 2021, 卷号: 127
作者:  Zhang, Huili;  Sun, Dunlu;  Luo, Jianqiao;  Quan, Cong;  Cheng, Maojie
  |  收藏  |  浏览/下载：44/0  |  提交时间：2021/11/01
Spectral absorption properties of organic carbon aerosol during a polluted winter in Beijing, China 期刊论文  OAI收割
SCIENCE OF THE TOTAL ENVIRONMENT, 2021, 卷号: 755, 页码: 13
作者:  Wu, Yunfei;  Li, Jiwei;  Jiang, Chen;  Xia, Yunjie;  Tao, Jun
  |  收藏  |  浏览/下载：37/0  |  提交时间：2021/05/08
A Spectral Microplane Model for the Anisotropic Damage Behavior of Shales 期刊论文  OAI收割
JOURNAL OF APPLIED MECHANICS-TRANSACTIONS OF THE ASME, 2020, 卷号: 87, 期号: 8, 页码: 11
作者:  Li MY(李明耀);  Chen X;  Zhou D(周东);  Su YW(苏业旺)
  |  收藏  |  浏览/下载：115/0  |  提交时间：2020/08/31
Macroscopic Au@PANI Core/Shell Nanoparticle Superlattice Monolayer Film with Dual-Responsive Plasmonic Switches 期刊论文  OAI收割
ACS APPLIED MATERIALS & INTERFACES, 2020, 卷号: 12, 期号: 9, 页码: 11296-11304
作者:  Lin, Han;  Song, Liping;  Huang, Youju;  Cheng, Qian;  Yang, Yanping
  |  收藏  |  浏览/下载：17/0  |  提交时间：2020/12/16
An underlying clock in the extreme flip-flop state transitions of the black hole transient Swift J1658.2-4242 期刊论文  OAI收割
Astronomy and Astrophysics, 2020, 卷号: 641, 页码: A101
作者:  
  |  收藏  |  浏览/下载：49/0  |  提交时间：2022/02/08
accretion  accretion disks  black hole physics  X-rays: binaries  time  Astrophysics - High Energy Astrophysical Phenomena  Abstract:
Aims: Flip-flops are top-hat-like X-ray flux variations, which have been observed in some transient accreting black hole binary systems, and feature simultaneous changes in the spectral hardness and the power density spectrum (PDS). They occur at a crucial time in the evolution of these systems, when the accretion disc emission starts to dominate over coronal emission. Flip-flops remain a poorly understood phenomenon, so we aim to thoroughly investigate them in a system featuring several such transitions.
Methods: Within the multitude of observations of Swift J1658.2-4242 during its outburst in early 2018, we detected 15 flip-flops, enabling a detailed analysis of their individual properties and the differences between them. We present observations by XMM-Newton, NuSTAR, Astrosat, Swift, Insight-HXMT, INTEGRAL, and ATCA. We analysed their light curves, searched for periodicities, computed their PDSs, and fitted their X-ray spectra, to investigate the source behaviour during flip-flop transitions and how the interval featuring flip-flops differs from the rest of the outburst.
Results: The flip-flops of Swift J1658.2-4242 are of an extreme variety, exhibiting flux differences of up to 77% within 100 s, which is much larger than what has been seen previously. We observed radical changes in the PDS simultaneous with the sharp flux variations, featuring transitions between the quasi-periodic oscillation types C and A, which have never been observed before. Changes in the PDS are delayed, but more rapid than changes in the light curve. Flip-flops occur in two intervals within the outburst, separated by about two weeks in which these phenomena were not seen. Transitions between the two flip-flop states occurred at random integer multiples of a fundamental period of 2.761 ks in the first interval and 2.61 ks in the second. Spectral analysis reveals the high and low flux flip-flop states to be very similar, but distinct from intervals lacking flip-flops. A change of the inner temperature of the accretion disc is responsible for most of the flux difference in the flip-flops. We also highlight the importance of correcting for the influence of the dust scattering halo on the X-ray spectra.  
GRB 200415A: A Short Gamma-Ray Burst from a Magnetar Giant Flare? 期刊论文  OAI收割
The Astrophysical Journal, 2020, 卷号: 899, 页码: 106
作者:  HXMT
  |  收藏  |  浏览/下载：27/0  |  提交时间：2022/02/08
Gamma-ray bursts  Soft gamma-ray repeaters  Magnetars  Gamma-ray  transient sources  629  1441  992  1853  Astrophysics - High Energy  Astrophysical Phenomena  Abstract: The giant flares of soft gamma-ray repeaters (SGRs) have long been proposed to contribute to at least a subsample of the observed short gamma-ray bursts (GRBs). In this paper, we perform a comprehensive analysis of the high-energy data of the recent bright short GRB 200415A, which was located close to the Sculptor galaxy. Our results suggest that a magnetar giant flare provides the most natural explanation for most observational properties of GRB 200415A, including its location, temporal and spectral features, energy, statistical correlations, and high-energy emissions. On the other hand, the compact star merger GRB model is found to have difficulty reproducing such an event in a nearby distance. Future detections and follow-up observations of similar events are essential to firmly establish the connection between SGR giant flares and a subsample of nearby short GRBs.  
Abundance Estimates for 16 Elements in 6 Million Stars from LAMOST DR5 Low-Resolution Spectra 期刊论文  OAI收割
The Astrophysical Journal Supplement Series, 2019, 卷号: 245, 期号: 2
作者:  Xiang,Maosheng;  Ting,Yuan-Sen;  Rix,Hans-Walter;  Sandford,Nathan;  Buder,Sven
  |  收藏  |  浏览/下载：9/0  |  提交时间：2020/03/10
The higher, the closer, the better? Influence of sampling frequency and distance on the acoustic properties of short-beaked common dolphins burst pulses in the Mediterranean Sea 期刊论文  OAI收割
AQUATIC CONSERVATION-MARINE AND FRESHWATER ECOSYSTEMS, 2019, 页码: 10
作者:  Papale, Elena;  Alonge, Giuseppe;  Caruso, Francesco;  Grammauta, Rosario;  Mazzola, Salvatore
  |  收藏  |  浏览/下载：21/0  |  提交时间：2020/03/16