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浏览/检索结果: 共15条，第1-10条 帮助

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Quartz optically stimulated luminescence dating of loess in Tajikistan and its paleoclimatic implications for arid Central Asia since the Lateglacial 期刊论文  OAI收割
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY, 2020, 卷号: 556, 页码: 109881
作者:  Yang, Shengli;  Li, Dongxue;  Liu, Nannan;  Zan, Jinbo;  Liu, Weiming
  |  收藏  |  浏览/下载：98/0  |  提交时间：2020/09/25
Effects of dust-in-snow forcing over the Tibetan Plateau on the East Asian dust cycle during the Last Glacial Maximum 期刊论文  OAI收割
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY, 2020, 卷号: 542, 页码: 13
作者:  Shen, Jiaojiao;  Xie, Xiaoning;  Cheng, Xugeng;  Liu, Xiaodong
  |  收藏  |  浏览/下载：32/0  |  提交时间：2020/06/03
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：49/0  |  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.  
Horizontal wind erosion flux and potential dust emission in arid and semiarid regions of China: A major source area for East Asia dust storms 期刊论文  iSwitch采集
CATENA, 2015, 卷号: 133, 页码: 373-384
作者:  Wang, Haibing;  Jia, Xiaopeng;  Li, Kuan;  Li, Yongshan
收藏  |  浏览/下载：26/0  |  提交时间：2019/10/09
Magnetic properties of eolian sand sediments in the Mu Us Desert and their paleoenvironmental significance 期刊论文  iSwitch采集
CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION, 2015, 卷号: 58, 期号: 10, 页码: 3706-3718
作者:  Zhao Shuang;  Gao Fu-Yuan;  Jia Jia;  Li Guan-Hua;  Xia Dun-Sheng
收藏  |  浏览/下载：28/0  |  提交时间：2019/10/09
煤矿粉尘影响三种典型荒漠植被生长的高光谱指数研究(英文)/Using Hyperspectral Indices to Measure the Effect of Mine Dust on the Growth of Three Typical Desert Plants[J] 期刊论文  OAI收割
光谱学与光谱分析, 2014, 卷号: 8, 页码: 2162-2168
作者:  张鹏飞;  古丽加帕尔;  阴俊齐;  包安明;  姚峰
  |  收藏  |  浏览/下载：17/0  |  提交时间：2017/12/29
Horizontal aeolian sediment flux in the Minqin area, a major source of Chinese dust storms 期刊论文  iSwitch采集
GEOMORPHOLOGY, 2010, 卷号: 116, 期号: 1-2, 页码: 58-66
作者:  Dong, Zhibao;  Man, Duoqing;  Luo, Wanyin;  Qian, Guangqiang;  Wang, Jihe
收藏  |  浏览/下载：30/0  |  提交时间：2019/10/08
Estimations of the Maximum Tangential Velocity Vθm in the Vortex Core Regionand also the Mean Rotational Velocity Voi near the Concave Wall Surface in the Returned Flow Type Cyclone Dust Collector 期刊论文  OAI收割
JOURNAL OF THERMAL SCIENCE, 2010, 卷号: 19, 期号: 6, 页码: 553,560
Akira Ogawa
收藏  |  浏览/下载：20/0  |  提交时间：2013/01/06
Estimations of the Maximum Tangential Velocity Vθm in the Vortex Core Regionand also the Mean Rotational Velocity Voi near the Concave Wall Surface in the Returned Flow Type Cyclone Dust Collector 期刊论文  OAI收割
JOURNAL OF THERMAL SCIENCE, 2010, 卷号: 19, 期号: 6, 页码: 553,560
作者:  Akira Ogawa
  |  收藏  |  浏览/下载：17/0  |  提交时间：2013/01/06
Palaeovariations in the east-asian monsoon regime geochemically recorded in varved sediments of lake sihailongwan (Northeast China, Jilin Province). Part 1: Hydrological conditions and dust flux 期刊论文  OAI收割
JOURNAL OF PALEOLIMNOLOGY, 2006, 卷号: 35, 期号: 2, 页码: 239-270
作者:  Schettler, G;  Liu, Q;  Mingram, J;  Negendank, JFW
  |  收藏  |  浏览/下载：30/0  |  提交时间：2018/09/26