中国科学院机构知识库网格系统: 检索

High-precision polar motion prediction using EOP_20_C04 and EAM based on CSLS plus AR and CSLS plus LSTM methods 期刊论文 OAI收割
GEOPHYSICAL JOURNAL INTERNATIONAL, 2023, 卷号: 235, 期号: 2, 页码: 1658-1670
作者: Kong, Qiaoli; Han, Jingwei; Wu, Yuanwei; Wang, Tianfa; Chen, Yanfei

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收藏 | 浏览/下载：16/0 | 提交时间：2023/12/13

Earth rotation variations Space geodetic surveys Non-linear differential equations Time-series analysis

Human's digital footprints on the Qinghai-Tibet Plateau: Variations during festivals and impacts on nature reserves 期刊论文 OAI收割
JOURNAL OF GEOGRAPHICAL SCIENCES, 2021, 卷号: 31, 期号: 2, 页码: 179-194
作者: Du Yunyan; Tu Wenna; Liang Fuyuan; Yi Jiawei

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收藏 | 浏览/下载：29/0 | 提交时间：2021/06/10

digital footprint space-time variations human impact nature reserve location request

Human's digital footprints on the Qinghai-Tibet Plateau: Variations during festivals and impacts on nature reserves 期刊论文 OAI收割
JOURNAL OF GEOGRAPHICAL SCIENCES, 2021, 卷号: 31, 期号: 2, 页码: 179-194
作者: Du Yunyan; Tu Wenna; Liang Fuyuan; Yi Jiawei

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收藏 | 浏览/下载：35/0 | 提交时间：2021/06/10

digital footprint space-time variations human impact nature reserve location request

On the Stationarity of Annual Precipitation over China (1959-2018) 期刊论文 OAI收割
JOURNAL OF HYDROMETEOROLOGY, 2020, 卷号: 21, 期号: 5, 页码: 881-890
作者: Wang, Hong; Sun, Fubao

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收藏 | 浏览/下载：16/0 | 提交时间：2021/03/23

Precipitation Climate change Climate variability Time series Variational analysis Annual variations

On the Stationarity of Annual Precipitation over China (1959-2018) 期刊论文 OAI收割
JOURNAL OF HYDROMETEOROLOGY, 2020, 卷号: 21, 期号: 5, 页码: 881-890
作者: Wang, Hong; Sun, Fubao

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收藏 | 浏览/下载：14/0 | 提交时间：2021/03/23

Precipitation Climate change Climate variability Time series Variational analysis Annual variations

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.

Impacts of hydrologic variations on chemical weathering and solute sources in the Min River basin, Himalayan-Tibetan region 期刊论文 OAI收割
Environmental Science and Pollution Research, 2017, 页码: 19126–19137
作者: Jun Zhong; Si-liang Li; Faxiang Tao; Hu Ding; Jing Liu

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收藏 | 浏览/下载：28/0 | 提交时间：2018/03/28

Chemical Weathering Chemostatic Behaviour Dissolution Kinetics Fluid Transit Time Himalayan-tibetan Region Hydrologic Variations

Impacts of hydrologic variations on chemical weathering and solute sources in the Min River basin, Himalayan–Tibetan region 期刊论文 OAI收割
Environmental Science and Pollution Research, 2017, 卷号: 24, 期号: 23, 页码: 19126–19137
作者: Jun Zhong; Si-liang Li; Faxiang Tao; Hu Ding; Jing Liu

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收藏 | 浏览/下载：26/0 | 提交时间：2018/12/07

Hydrologic Variations Fluid Transit Time Chemical Weathering Chemostatic Behaviour Dissolution Kinetics Himalayan–tibetan Region

Non-fragile H-infinity filtering for nonlinear discrete-time delay systems with randomly occurring gain variations 期刊论文 OAI收割
ISA TRANSACTIONS, 2016, 卷号: 63, 页码: 196-203
作者: Liu, Yajuan; Park, Ju H.; Guo, Bao-Zhu

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收藏 | 浏览/下载：25/0 | 提交时间：2018/07/30

Nonlinear discrete-time systems Interval time-delay Non-fragile filter Randomly occurring gain variations

Estimation of the free core nutation period by the sliding-window complex least-squares fit method 期刊论文 OAI收割
ADVANCES IN SPACE RESEARCH, 2016, 卷号: 57, 期号: 10, 页码: 2136-2140
作者: Zhou, Yonghong; Zhu, Qiang; Salstein, David A.; Xu, Xueqing; Shi, Si

收藏 | 浏览/下载：34/0 | 提交时间：2016/09/27

Earth rotation variations Outer core Inner core Time-series analysis