中国科学院机构知识库网格
Chinese Academy of Sciences Institutional Repositories Grid
首页 机构 成果 学者
  
  1. CAS IR Grid
机构
采集方式
内容类型
发表日期
学科主题
筛选

浏览/检索结果: 共6条，第1-6条 帮助

条数/页： 排序方式：
Paleontologic, paleogeographic, and sedimentologic controls on the spatial-temporal distribution of Permian sponge reefs in South China 期刊论文  OAI收割
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY, 2024, 卷号: 654, 页码: 20
作者:  Tian, Xuesong;  Liang, Kun;  Vinn, Olev;  Chen, Dishu;  Zhang, Feng
  |  收藏  |  浏览/下载：11/0  |  提交时间：2025/03/28
Variational Inference Based Kernel Dynamic Bayesian Networks for Construction of Prediction Intervals for Industrial Time Series With Incomplete Input 期刊论文  OAI收割
IEEE/CAA Journal of Automatica Sinica, 2020, 卷号: 7, 期号: 5, 页码: 1429-1437
作者:  Long Chen;  Linqing Wang;  Zhongyang Han;  Jun Zhao;  Wei Wang
  |  收藏  |  浏览/下载：30/0  |  提交时间：2021/03/11
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：59/0  |  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.  
Time and frequency transfer using BDS-2 and BDS-3 carrier-phase observations 期刊论文  OAI收割
IET RADAR SONAR AND NAVIGATION, 2019, 卷号: 13, 期号: 8, 页码: 1249-1255
作者:  Zhang, Pengfei;  Tu, Rui;  Zhang, Rui;  Liu, Na;  Gao, Yuping
  |  收藏  |  浏览/下载：23/0  |  提交时间：2021/11/29
Influencing Factor Analysis of Interference Vibration Reduction of Millisecond Blasting 期刊论文  OAI收割
DISASTER ADVANCES, 2012, 卷号: 5, 期号: 4, 页码: 494-501
作者:  Yan Yongfeng;  Li Haibo;  Zhang Qiuhua;  Chen Shihai;  Lv Yanxin
  |  收藏  |  浏览/下载：25/0  |  提交时间：2018/06/05
基于电光调制的激光光谱整形技术 期刊论文  OAI收割
Chin. Opt. Lett., 2008, 卷号: 6, 期号: 11, 页码: 841, 844
王艳海; 王江峰; 姜有恩; 鲍岩; 李学春; 林尊琪
收藏  |  浏览/下载：1291/335  |  提交时间：2009/09/18