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浏览/检索结果: 共64条，第1-10条 帮助 条数/页： 5101520253035404550556065707580859095100 排序方式： 请选择题名升序题名降序提交时间升序提交时间降序作者升序作者降序发表日期升序发表日期降序 Determination of uniaxial creep properties using equivalent factors by sharp indentation 期刊论文  OAI收割 MATERIALS TODAY COMMUNICATIONS, 2024, 卷号: 41, 页码: 10 作者:  Peng, Guangjian;  Zhang, Jiangfeng;  Xu, Fenglei;  Jiang, Weifeng;  Feng, Yihui   |  收藏  |  浏览/下载：13/0  |  提交时间：2024/11/14 Creep coefficient  Equivalent factor  Instrumented sharp indentation  Finite element simulation  Strain hardening exponent   Classification of self-limited epilepsy with centrotemporal spikes by classical machine learning and deep learning based on electroencephalogram data 期刊论文  OAI收割 BRAIN RESEARCH, 2024, 卷号: 1830 作者:  Liu, Xi   |  收藏  |  浏览/下载：23/0  |  提交时间：2024/07/15 Epilepsy  Electroencephalogram  Sharp wave extraction  Machine learning  Random forest  Residual network   Nonlinear mooring system for a 'Sharp-Eagle' wave energy converter 期刊论文  OAI收割 OCEAN ENGINEERING, 2022, 卷号: 260, 页码: 17 作者:  Wang, Wensheng;  Zhao, Chenyu;  Peng, Wen;  Ding, Weiwei;  Chen, Min   |  收藏  |  浏览/下载：12/0  |  提交时间：2024/12/03 Sharp -eagle WEC  UoE tether  Mooring  Tension reduction   Divergent operator with degeneracy and related sharp inequalities 期刊论文  OAI收割 JOURNAL OF FUNCTIONAL ANALYSIS, 2022, 卷号: 282, 期号: 2, 页码: 85 作者:  Dou, Jingbo;  Sun, Liming;  Wang, Lei;  Zhu, Meijun   |  收藏  |  浏览/下载：29/0  |  提交时间：2022/04/02 Divergent operator  Sharp weighted Sobolev inequality  Baouendi-Grushin operator  Moving sphere method   Mixed mode equilibrium analysis of asymptotic fields around stationary sharp V-notches in polymer gels: A linear poroelastic study 期刊论文  OAI收割 THEORETICAL AND APPLIED FRACTURE MECHANICS, 2021, 卷号: 116, 页码: 10 作者:  Li, Yunlong;  Niu, Zheng;  Chen, Xianjia;  Chen XJ(陈贤佳)   |  收藏  |  浏览/下载：36/0  |  提交时间：2022/01/13 Mixed mode loadings  Asymptotic solution  Sharp V-notches  Thermodynamic equilibrium  Poroelasticity  Polymer gels   Single Mode Simulation Calculation of Oscillating Buoy Wave Energy Converter with A Slider 期刊论文  OAI收割 CHINA OCEAN ENGINEERING, 2020, 卷号: 34, 期号: 4, 页码: 547-557 作者:  Xiao Lei;  You Ya-ge;  Wang Zhen-peng;  Zhang Ya-qun;  Huang Shuo   |  收藏  |  浏览/下载：31/0  |  提交时间：2020/10/30 wave energy converter (WEC)  Sharp Eagle  hydrodynamic calculation  eagle beak   A second-order and nonuniform time-stepping maximum-principle preserving scheme for time-fractional Allen-Cahn equations 期刊论文  OAI收割 JOURNAL OF COMPUTATIONAL PHYSICS, 2020, 卷号: 414, 页码: 16 作者:  Liao, Hong-lin;  Tang, Tao;  Zhou, Tao   |  收藏  |  浏览/下载：30/0  |  提交时间：2020/06/30 Time-fractional Allen-Cahn equation  Alikhanov formula  Adaptive time-stepping strategy  Discrete maximum principle  Sharp error estimate   A Simple and Robust Total Variation-Based Inversion Scheme for Transient Electromagnetic Data 期刊论文  OAI收割 IEEE ACCESS, 2020, 卷号: 8, 页码: 16539-16549 作者:  Rao, Liting;  Gao, Jianshen;  Wu, Xin;  Wang, Youcheng;  Jia, Huiqin   |  收藏  |  浏览/下载：105/0  |  提交时间：2020/05/18 Reconstructing minimization approach  sharp boundaries  total variation  transient electromagnetic inversion   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：61/0  |  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.