中国科学院机构知识库网格系统: 检索

Solutions to a nonlinear Dirac-Maxwell system: from periodic waves to soliton-like waves 期刊论文 OAI收割
NONLINEARITY, 2022, 卷号: 35, 期号: 12, 页码: 6422-6452
作者: Pan, Chen; Yanheng, Ding; Hua-Yang, Wang

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收藏 | 浏览/下载：22/0 | 提交时间：2023/02/07

Dirac-Maxwell system variational methods periodic solutions soliton-like solutions ground states

Evolution of Controllers Under a Generalized Structure Encoding/Decoding Scheme With Application to Magnetic Levitation System 期刊论文 OAI收割
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS, 2022, 卷号: 69, 期号: 9, 页码: 9655-9666
作者: Xin, Bin; Wang, Yipeng; Xue, Wenchao; Cai, Tao; Fan, Zhun

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收藏 | 浏览/下载：53/0 | 提交时间：2022/06/21

Optimization Design methodology Control systems Tuning Magnetic levitation Signal processing Periodic structures Automatic design of controllers disturbance-rejection intelligent optimization algorithms magnetic levitation system (MLS) mixed-variable optimization

Periodic Solutions to Klein-Gordon Systems with Linear Couplings 期刊论文 OAI收割
ADVANCED NONLINEAR STUDIES, 2021, 卷号: 21, 期号: 3, 页码: 633-660
作者: Chen, Jianyi; Zhang, Zhitao

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收藏 | 浏览/下载：46/0 | 提交时间：2021/10/26

Wave Equation Variational Method Klein-Gordon System Periodic Solutions

Implementation of Laplace Transformed MP2 for Periodic Systems With Numerical Atomic Orbitals 期刊论文 OAI收割
FRONTIERS IN CHEMISTRY, 2020, 卷号: 8, 页码: 6
作者: Shang, Honghui; Yang, Jinlong

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收藏 | 浏览/下载：34/0 | 提交时间：2021/12/01

MP2 NAO real-space Hartree– Fock periodic system

High solids all-inclusive polysaccharide hydrolysis of steam-exploded corn pericarp by periodic peristalsis 期刊论文 OAI收割
CARBOHYDRATE POLYMERS, 2020, 卷号: 246, 页码: 8
作者: Khatun, M. H. A.; Wang, Lan; Chen, Hongzhang

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收藏 | 浏览/下载：41/0 | 提交时间：2020/09/22

Corn pericarp Steam explosion Structural fractionation Physicochemical characterization Cellulase Periodic peristalsis hydrolysis system

Asymptotic stabilization for a wave equation with periodic disturbance 期刊论文 OAI收割
IMA JOURNAL OF MATHEMATICAL CONTROL AND INFORMATION, 2020, 卷号: 37, 期号: 3, 页码: 894-917
作者: Wei, Jing; Feng, Hongyinping; Guo, Bao-Zhu

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收藏 | 浏览/下载：16/0 | 提交时间：2021/01/14

stability periodic disturbance coupled system

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：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.

Existence of periodic probability solutions to Fokker-Planck equations with applications 期刊论文 OAI收割
JOURNAL OF FUNCTIONAL ANALYSIS, 2019, 卷号: 277, 期号: 11, 页码: 41
作者: Ji, Min; Qi, Weiwei; Shen, Zhongwei; Yi, Yingfei

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收藏 | 浏览/下载：57/0 | 提交时间：2020/01/10

Fokker-Planck equation Periodic probability solution Stochastic differential inclusion Stochastic damping Hamiltonian system

Optimal Gimbal System Control Strategy for Error Prediction Compensation 会议论文 OAI收割
Shanghai, China, 2019-08-14
作者: Yang, Yongqing; Hao, Wei; Yu, Tianye; Xie, Meilin; Liang, Yanbing

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收藏 | 浏览/下载：23/0 | 提交时间：2020/05/18

prediction error compensation energy spectrum analysis optimal control tracking gimbal system periodic error

Timing analysis of Swift J1658.2-4242's outburst in 2018 with Insight-HXMT, NICER and AstroSat 期刊论文 OAI收割
Journal of High Energy Astrophysics, 2019, 卷号: 24, 页码: 30-40
作者: HXMT

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收藏 | 浏览/下载：57/0 | 提交时间：2022/02/08

Accretion accretion disks Black hole physics X-rays: binaries: Swift J1658.2-4242 Astrophysics - High Energy Astrophysical Phenomena Abstract: We present the observational results from a detailed timing analysis of the black hole candidate Swift J1658.2-4242 during its 2018 outburst with the observations of Hard X-ray Modulation Telescope (Insight-HXMT), Neutron Star Interior Composition Explorer (NICER) and AstroSat in 0.1-250 keV. The evolution of intensity, hardness and integrated fractional root mean square (rms) observed by Insight-HXMT and NICER are presented in this paper. Type-C quasi-periodic oscillations (QPOs) observed by NICER (0.8-3.5 Hz) and Insight-HXMT (1-1.6 Hz) are also reported in this work. The features of the QPOs are analyzed with an energy range of 0.5-50 keV. The relations between QPO frequency and other characteristics such as intensity, hardness and QPO rms are carefully studied. The timing and spectral properties indicate that Swift J1658.2-4242 is a black hole binary system. Besides, the rms spectra of the source calculated from the simultaneous observation of Insight-HXMT, NICER and AstroSat support the Lense-Thirring origin of the QPOs. The relation between QPO phase lag and the centroid frequency of Swift J1658.2-4242 reveals a near zero constant when < 4Hz and a soft phase lag at 6.68 Hz. This independence follows the same trend as the high inclination galactic black hole binaries such as MAXI J1659-152.