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浏览/检索结果: 共23条，第1-10条 帮助

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NDBSI: A normalized difference bare soil index for remote sensing to improve bare soil mapping accuracy in urban and rural areas 期刊论文  OAI收割
CATENA, 2022, 卷号: 214, 页码: 11
作者:  Liu, Ying;  Meng, Qingyan;  Zhang, Linlin;  Wu, Chaoyang
  |  收藏  |  浏览/下载：55/0  |  提交时间：2022/09/21
NDBSI: A normalized difference bare soil index for remote sensing to improve bare soil mapping accuracy in urban and rural areas 期刊论文  OAI收割
CATENA, 2022, 卷号: 214, 页码: 11
作者:  Liu, Ying;  Meng, Qingyan;  Zhang, Linlin;  Wu, Chaoyang
  |  收藏  |  浏览/下载：22/0  |  提交时间：2022/09/21
Multibranch Feature Difference Learning Network for Cross-Spectral Image Patch Matching 期刊论文  OAI收割
IEEE Transactions on Geoscience and Remote Sensing, 2022, 卷号: 60, 页码: 1-15
作者:  Yu C(余创);  Liu YP(刘云鹏);  Li CX(李晨曦);  Qi L(亓琳);  Xia X(夏鑫)
  |  收藏  |  浏览/下载：43/0  |  提交时间：2022/06/07
Improving phenological monitoring of winter wheat by considering sensor spectral response in spatiotemporal image fusion 期刊论文  OAI收割
PHYSICS AND CHEMISTRY OF THE EARTH, 2020, 卷号: 116, 页码: 11
作者:  Cao, Ziyang;  Chen, Shaohui;  Gao, Feng;  Li, Xueke
  |  收藏  |  浏览/下载：31/0  |  提交时间：2021/03/23
Improving phenological monitoring of winter wheat by considering sensor spectral response in spatiotemporal image fusion 期刊论文  OAI收割
PHYSICS AND CHEMISTRY OF THE EARTH, 2020, 卷号: 116, 页码: 11
作者:  Cao, Ziyang;  Chen, Shaohui;  Gao, Feng;  Li, Xueke
  |  收藏  |  浏览/下载：15/0  |  提交时间：2021/03/23
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：60/0  |  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.  
An Exact Propagator for Solving the Triatomic Reactive Schrodinger Equation 期刊论文  OAI收割
CHINESE JOURNAL OF CHEMICAL PHYSICS, 2017, 卷号: 30, 期号: 6, 页码: 761-770
作者:  Li, Xue-ming;  Sun, Zhi-gang
  |  收藏  |  浏览/下载：29/0  |  提交时间：2019/06/20
Lithological mapping with multispectral data – setup and application of a spectral database for rocks in the Balakot area, Northern Pakistan 期刊论文  OAI收割
Journal of Mountain Science, 2017, 卷号: 14, 期号: 5, 页码: 948-963
作者:  Michael FUCHS;  Adnan A. AWAN;  Sardar S. AKHTAR;  Ijaz AHMAD;  Simon SADIQ
  |  收藏  |  浏览/下载：34/0  |  提交时间：2017/06/21
Assessing methods of identifying open water bodies using Landsat 8 OLI imagery SCI/SSCI论文  OAI收割
2016
作者:  Liu Z. F.;  Yao, Z. J.;  Wang, R.
  |  收藏  |  浏览/下载：23/0  |  提交时间：2017/11/09
Cross-Comparison of Vegetation Indices Derived from Landsat-7 Enhanced Thematic Mapper Plus ( ETM plus ) and Landsat-8 Operational Land Imager ( OLI) Sensors SCI/SSCI论文  OAI收割
2014
作者:  Li P.;  Jiang L. G.;  Feng Z. M.
  |  收藏  |  浏览/下载：81/0  |  提交时间：2014/12/24