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	Search for the Gravitational-wave Background from Cosmic Strings with the Parkes Pulsar Timing Array Second Data Release 期刊论文 OAI收割 ASTROPHYSICAL JOURNAL, 2022, 卷号: 936, 期号: 1, 页码: 20 作者: Chen, Zu-Cheng; Wu, Yu-Mei; Huang, Qing-Guo \| 收藏 \| 浏览/下载：25/0 \| 提交时间：2023/01/16 HOLE BINARY-SYSTEMS SPIN NOISE MODEL RADIATION LIMITS PACKAGE TEMPO2
	Searching for isotropic stochastic gravitational-wave background in the international pulsar timing array second data release 期刊论文 OAI收割 COMMUNICATIONS IN THEORETICAL PHYSICS, 2022, 卷号: 74, 期号: 10, 页码: 105402 作者: Chen, Zu-Cheng; Wu, Yu-Mei; Huang, Qing-Guo \| 收藏 \| 浏览/下载：15/0 \| 提交时间：2023/01/16 HOLE BINARY-SYSTEMS RADIATION PACKAGE TEMPO2 LIMITS PROBE
	Non-tensorial gravitational wave background in NANOGrav 12.5-year data set 期刊论文 OAI收割 SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY, 2021, 卷号: 64, 期号: 12, 页码: 120412 作者: Chen, Zu-Cheng; Yuan, Chen; Huang, Qing-Guo \| 收藏 \| 浏览/下载：7/0 \| 提交时间：2023/01/16 PULSAR-TIMING PACKAGE HOLE BINARY-SYSTEMS ARRAY LIMITS BLACK-HOLES SEARCH CONSTRAINTS RADIATION TEMPO2 PROBE
	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.
	GWs from S-stars Revolving Around SMBH at Sgr A 期刊论文 OAI收割 COMMUNICATIONS IN THEORETICAL PHYSICS, 2018, 卷号: 70, 期号: 6, 页码: 735-748 作者: Cai, RG; Liu, TB; Wang, SJ \| 收藏 \| 浏览/下载：23/0 \| 提交时间：2019/07/19 MASSIVE BLACK-HOLE POST-NEWTONIAN MOTION GRAVITATIONAL-RADIATION BINARY-SYSTEMS ASTROPHYSICS EVOLUTION POINT SPACE WAVES
	A direct construction of polynomial-size obdd proof of pigeon hole problem 期刊论文 iSwitch采集 Information processing letters, 2009, 卷号: 109, 期号: 10, 页码: 472-477 作者: Chen, Wei; Zhang, Wenhui 收藏 \| 浏览/下载：32/0 \| 提交时间：2019/05/10 Propositional proof systems Binary decision diagrams Pigeon hole problem Proof complexity Computational complexity
	a direct construction of polynomial-size obdd proof of pigeon hole problem 期刊论文 OAI收割 INFORMATION PROCESSING LETTERS, 2009, 卷号: 109, 期号: 10, 页码: 472-477 Chen Wei; Zhang Wenhui \| 收藏 \| 浏览/下载：23/0 \| 提交时间：2011/03/18 Propositional proof systems Binary decision diagrams Pigeon hole problem Proof complexity Computational complexity