中国科学院机构知识库网格系统: 检索

500-Year Periodic Vegetation and Monsoonal Climate Oscillations During the Last Deglaciation in East Asia 期刊论文 OAI收割
GEOPHYSICAL RESEARCH LETTERS, 2023, 卷号: 50, 期号: 14, 页码: 11
作者: Xu, Deke; Chu, Guoqiang; Shen, Caiming; Sun, Qing; Wu, Jing

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收藏 | 浏览/下载：19/0 | 提交时间：2024/01/02

annually laminated Maar Lake pollen assemblages last deglacial period East Asian monsoon El Nino-Southern Oscillation

Coral perspective on temperature seasonality and interannual variability in the northern South China Sea during the Roman Warm Period 期刊论文 OAI收割
GLOBAL AND PLANETARY CHANGE, 2021, 卷号: 207, 页码: 13
作者: Jiang, Leilei; Yu, Kefu; Han, Tao; Tao, Shichen; Zhang, Huiling

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收藏 | 浏览/下载：34/0 | 提交时间：2021/12/07

Coral Sr/Ca Sea-surface temperature Seasonality El Nino-Southern Oscillation Roman Warm Period South China Sea

Photometric Study and Absolute Parameter Estimation of Six Totally Eclipsing Contact Binaries 期刊论文 OAI收割
Astronomical Journal, 2021, 卷号: 162, 期号: 1, 页码: 13
作者: Li, Kai; Xia, Qi-Qi; Kim, Chun-Hwey; Gao, Xing; Hu, Shao-Ming

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收藏 | 浏览/下载：35/0 | 提交时间：2022/06/30

low-mass-ratio light-curve analysis ursae-majoris system thermal relaxation oscillation radial-velocity curves flip-flop activity short-period limit rt leonis minoris uma-type binaries physical parameters Astronomy & Astrophysics

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：65/0 | 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.

Attribution of variations in the quasi-biennial oscillation period from the duration of easterly and westerly phases 期刊论文 iSwitch采集
Climate dynamics, 2016, 卷号: 47, 期号: 5-6, 页码: 1943-1959
作者: Yang, Mengmiao; Yu, Yueyue

收藏 | 浏览/下载：48/0 | 提交时间：2019/05/09

Quasi-biennial oscillation period Wavelet analysis Multi-variance-eof analysis Westerly and easterly phases

Thermal variations in the South China Sea associated with the eastern and central Pacific El Nino events and their mechanisms 期刊论文 OAI收割
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS, 2014, 卷号: 119, 期号: 12, 页码: 8955-8972
作者: Chen, Ju; Xie, Qiang; Shu, Yeqiang; Wang, Xin; Wang, Dongxiao

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收藏 | 浏览/下载：39/0 | 提交时间：2015/12/02

Eastern Pacific El Nino Central Pacific El Nino Basin Mode Semibasin Mode Oscillation Period

High resolution oxygen isotope and grayscale records of a medieval fossil giant clam (Tridacna gigas) in the South China Sea: physiological and paleoclimatic implications 期刊论文 OAI收割
ACTA OCEANOLOGICA SINICA, 2014, 卷号: 33, 期号: 8, 页码: 18-25
作者: Wang, YH (Wang Yuhong)[ 3 ]; Yan, H (Yan Hong)[ 1,2 ]; Sun, LG (Sun Liguang)[ 2 ]

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收藏 | 浏览/下载：28/0 | 提交时间：2018/11/30

Tridacna Gigas Oxygen Isotope Blue Color Intensity Medieval Warm Period Sea Surfacetemperature El Niño–southern Oscillation

Dynamics Scenarios of Dual-Beam Optically Injected Semiconductor Lasers 期刊论文 OAI收割
ieee journal of quantum electronics, 2011, 卷号: 47, 期号: 6, 页码: 762-769
Qi XQ; Liu JM

收藏 | 浏览/下载：83/4 | 提交时间：2011/07/05

Dual-beam injection optical injection period-one state radio over fiber semiconductor laser dynamics SMALL-SIGNAL ANALYSIS FREQUENCY-CONVERSION LIGHT INJECTION SUBJECT MODULATION BANDWIDTH LOCKING OSCILLATION AM

Static and dynamic flow instability of a parallel microchannel heat sink at high heat fluxes 期刊论文 OAI收割
energy conversion and management, 2005, 卷号: 46, 期号: 2, 页码: 313-334
作者: Xu, JL; Zhou, HJ; Gan, YH

收藏 | 浏览/下载：17/0 | 提交时间：2016/10/27

microchannel onset of flow instability large amplitude/long period oscillation small amplitude/short period oscillation thermal oscillation

Growth of Rhizobium leguminosarum in a periodic pressure oscillating, solid-state fermentation of wheat straw 期刊论文 OAI收割
BIOTECHNOLOGY LETTERS, 2001, 卷号: 23, 期号: 10, 页码: 827-829
作者: Zhao, H; Zhang, XY; Li, ZH

收藏 | 浏览/下载：15/0 | 提交时间：2013/11/14

period pressure oscillation Rhizobium leguminosarum solid-state fermenter wheat straw