中国科学院机构知识库网格
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Relationship between the North Atlantic sea surface temperature and the summer extreme high temperature in the Beijing-Tianjin-Hebei region, China 期刊论文  OAI收割
URBAN CLIMATE, 2023, 卷号: 52, 页码: 12
作者:  
Yang, Haiyi;  Yang, Fei;  Sun, Leigang;  Ye, Yangbo;  Zhu, Shengli
  |  收藏  |  浏览/下载:17/0  |  提交时间:2024/03/01
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:  
HXMT
  |  收藏  |  浏览/下载:58/0  |  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.
  
Regional Temperature Response in Central Asia to National Committed Emission Reductions 期刊论文  OAI收割
INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH, 2019, 卷号: 16, 期号: 15, 页码: 15
作者:  
Zhang, Jintao;  Wang, Fang
  |  收藏  |  浏览/下载:21/0  |  提交时间:2020/03/23
Regional Temperature Response in Central Asia to National Committed Emission Reductions 期刊论文  OAI收割
INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH, 2019, 卷号: 16, 期号: 15, 页码: 15
作者:  
Zhang, Jintao;  Wang, Fang
  |  收藏  |  浏览/下载:23/0  |  提交时间:2020/03/23
Dynamic changes in temperature extremes and their association with atmospheric circulation patterns in the Songhua River Basin, China 期刊论文  OAI收割
ATMOSPHERIC RESEARCH, 2017, 卷号: 190, 页码: 77-88
作者:  
Qin, Chao;  Zhong, Keyuan;  Zheng, Fenli;  Wu, Hongyan;  Xu, Ximeng
  |  收藏  |  浏览/下载:24/0  |  提交时间:2018/04/12
Recent advances on reconstruction of climate and extreme events in China for the past 2000 years SCI/SSCI论文  OAI收割
2016
作者:  
Ge Q. S.;  Zheng, J. Y.;  Hao, Z. X.;  Liu, Y.;  Li, M. Q.
  |  收藏  |  浏览/下载:23/0  |  提交时间:2017/11/09
Heat stress impacts on wheat growth and yield were reduced in the Huang-Huai-Hai Plain of China in the past three decades SCI/SSCI论文  OAI收割
2015
作者:  
Tao F. L.;  Zhang, Z.;  Zhang, S.;  Rotter, R. P.
收藏  |  浏览/下载:39/0  |  提交时间:2015/12/09
Summer high temperature extremes in Southeast China associated with the East Asian jet stream and circumglobal teleconnection 期刊论文  OAI收割
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES, 2013, 卷号: 118, 期号: 15, 页码: 8306-8319
[Wang, Weiwen; Zhou, Wen] City Univ Hong Kong, Sch Energy & Environm, Guy Carpenter Asia Pacific Climate Impact Ctr, Hong Kong 00852, Hong Kong, Peoples R China; [Wang, Weiwen; Wang, Xin] Chinese Acad Sci, State Key Lab Trop Oceanog, South China Sea Inst Oceanol, Guangzhou, Guangdong, Peoples R China; [Fong, Soi Kun; Leong, Ka Cheng] Macao Meteorol & Geophys Bur, Taipa, Peoples R China
收藏  |  浏览/下载:42/0  |  提交时间:2015/01/14
Application of high-precision fuzzy control alorithm with self-regulation factor in RF hyperthermia system (EI CONFERENCE) 会议论文  OAI收割
6th International Conference on Machine Learning and Cybernetics, ICMLC 2007, August 19, 2007 - August 22, 2007, Hong Kong, China
Wang B.-D.; Chen Y.-Y.; Jiang C.-H.
收藏  |  浏览/下载:33/0  |  提交时间:2013/03/25