中国科学院机构知识库网格系统: 检索

Statistical analysis of the relationship between Power spectral density of magnetic turbulence and ion velocity in magnetotail bursty bulk Flows 期刊论文 OAI收割
ADVANCES IN SPACE RESEARCH, 2023, 卷号: 72, 期号: 2, 页码: 590-597
作者: Wu, Q.; Du, A. M.; Wang, G. Q.

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收藏 | 浏览/下载：15/0 | 提交时间：2024/01/02

BBF Spectral index Power Spectral Density

DDPM simulation of the erosion of immersed tubes in a pulsating fluidized bed 期刊论文 OAI收割
CHEMICAL ENGINEERING SCIENCE, 2023, 卷号: 269, 页码: 13
作者: Xu, Liuyun; Wu, Feng; Wang, Junwu

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收藏 | 浏览/下载：0/0 | 提交时间：2023/05/19

Pulsating flow Immersed tube erosion Pressure drop stability Power spectral density (PSD)

Quantitative Characterization Method for Rock Surface Roughness with Different Scale Fluctuation 期刊论文 OAI收割
KSCE JOURNAL OF CIVIL ENGINEERING, 2022, 页码: 17
作者: Guo, Yuhang; Zhang, Chuanqing; Xiang, Hang; Cui, Guojian; Meng, Fanzhen

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收藏 | 浏览/下载：45/0 | 提交时间：2022/04/11

Structural surface Roughness Quantitative characterization Power spectral density Statistical parameters

Experimental and numerical study of the characteristics of the forced oscillation in a pulsation fluidized bed (PFB) for coal separation 期刊论文 OAI收割
CHEMICAL ENGINEERING SCIENCE, 2021, 卷号: 234, 页码: 12
作者: Dong, Liang; Zhu, Fenglong; Li, Yanjiao; Zhao, Yuemin; Duan, Chenlong

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收藏 | 浏览/下载：36/0 | 提交时间：2021/03/29

Dry coal beneficiation Pressure fluctuation CFD-DEM simulation Power Spectral Density Bubble motion

Distinguishing Epileptiform Discharges From Normal Electroencephalograms Using Scale-Dependent Lyapunov Exponent 期刊论文 OAI收割
FRONTIERS IN BIOENGINEERING AND BIOTECHNOLOGY, 2020, 卷号: 8, 页码: 14
作者: Li, Qiong; Gao, Jianbo; Huang, Qi; Wu, Yuan; Xu, Bo

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收藏 | 浏览/下载：42/0 | 提交时间：2021/01/07

EEG epileptiform discharges power spectral density (PSD) scale-dependent Lyapunov exponent (SDLE) random forest classifier support vector machine (SVM)

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

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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.

Laser frequency noise measurement using an envelope-ratio method based on a delayed self-heterodyne interferometer 期刊论文 OAI收割
OPTICS COMMUNICATIONS, 2019, 卷号: 435, 页码: 244-250
作者: Zhan, Mingsheng; Wang, Jin; Chen, Xi; Xu, Peng; Zhong, Jiaqi

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收藏 | 浏览/下载：57/0 | 提交时间：2019/06/24

Heterodyne Laser frequency noise Power spectral density Linewidth

Sensing corrosion within an artificial defect in organic coating using SECM 期刊论文 OAI收割
SENSORS AND ACTUATORS B-CHEMICAL, 2019, 卷号: 280, 页码: 235-242
作者: Xia, Da-Hai; Wang, Jianqiu; Wu, Zhong; Qin, Zhenbo

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收藏 | 浏览/下载：23/0 | 提交时间：2021/02/02

Electrochemical noise Corrosion Scanning electrochemical microscopy (SECM) Power spectral density (PSD)

用于测量世界时的大型光纤陀螺仪的噪声分析 期刊论文 OAI收割
天文学报, 2019, 卷号: 60, 期号: 6
作者: 王惜康

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收藏 | 浏览/下载：39/0 | 提交时间：2020/11/09

fiber optic gyroscope universal time noise figure Allan variance power spectral density 光纤陀螺仪世界时噪声系数阿伦方差功率谱密度

Characterizing curved surface roughness of Wolter-I X-ray grazing incidence telescope 期刊论文 OAI收割
Chinese Optics, 2019, 卷号: 12, 期号: 3, 页码: 587-595
作者: Y.-C.Zhang; P.Liu

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收藏 | 浏览/下载：24/0 | 提交时间：2020/08/24

Surface roughness,Mirrors,Power spectral density,Spectral density,Surface measurement,Surface scattering,Telescopes,X ray scattering