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浏览/检索结果: 共27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 Detecting Spatiotemporal Differences in Cropland Abandonment and Reforestation Across the Three-North Region of China Based on Landsat Time Series 期刊论文  OAI收割 IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING, 2023, 卷号: 61, 页码: 12 作者:  Zhao, Xuan;  Wu, Taixia;  Wang, Shudong;  Liu, Kai;  Yang, Jingyu   |  收藏  |  浏览/下载：17/0  |  提交时间：2023/10/09 Automobiles  Green products  Earth  Remote sensing  Time series analysis  Artificial satellites  Forestry  Change detection  conversion of cropland to forests  LandTrendr (LTR)  normalized difference vegetation index (NDVI)  phenological  time series   High-accuracy continuous mapping of surface water dynamics using automatic update of training samples and temporal consistency modification based on Google Earth Engine: A case study from Huizhou, China 期刊论文  OAI收割 ISPRS JOURNAL OF PHOTOGRAMMETRY AND REMOTE SENSING, 2021, 卷号: 179, 页码: 66-80 作者:  Li, Kewei;  Xu, Erqi   |  收藏  |  浏览/下载：43/0  |  提交时间：2021/11/05 Surface water  Time series  Auto-updating of training samples  Temporal consistency detection  Change monitoring  Intra-annual information   High-accuracy continuous mapping of surface water dynamics using automatic update of training samples and temporal consistency modification based on Google Earth Engine: A case study from Huizhou, China 期刊论文  OAI收割 ISPRS JOURNAL OF PHOTOGRAMMETRY AND REMOTE SENSING, 2021, 卷号: 179, 页码: 66-80 作者:  Li, Kewei;  Xu, Erqi   |  收藏  |  浏览/下载：26/0  |  提交时间：2021/11/05 Surface water  Time series  Auto-updating of training samples  Temporal consistency detection  Change monitoring  Intra-annual information   Quantifying highly dynamic urban landscapes: Integrating object-based image analysis with Landsat time series data 期刊论文  OAI收割 LANDSCAPE ECOLOGY, 2020, 卷号: 36, 期号: 7, 页码: 1845-1861 作者:  Yu, Wenjuan;  Zhou, Weiqi;  Jing, Chuanbao;  Zhang, Yujia;  Qian, Yuguo   |  收藏  |  浏览/下载：23/0  |  提交时间：2021/08/31 Spatial heterogeneity  Land cover change  Remote sensing  Change detection  Frequency  Time of change   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：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.   基于多源遥感数据的塔里木河下游植被变化监测 学位论文  OAI收割 北京: 中国科学院大学, 2019 作者:  肖昊   |  收藏  |  浏览/下载：63/0  |  提交时间：2021/12/10 塔里木河下游  植被格局时空变化  植被长势监测  SAVI 时序数据  多方法分类  Lower Reaches of Tarim River  Spatio-Temporal Change of Vegetation Pattern  Monitoring of Vegetation Growth  SAVI Time Series Data  Multi-method Classification   A METHOD OF FORECASTING EARTHQUAKE BY OPTICAL ASTRONOMIC TIME-LATITUDE RESIDUALS 期刊论文  OAI收割 ACTA GEODYNAMICA ET GEOMATERIALIA, 2018, 卷号: 15, 期号: 1, 页码: 17-21 作者:  Su, Youjin;  Gao, Yuping;  Li CX(李春晓);  Hu H(胡辉)   |  收藏  |  浏览/下载：22/0  |  提交时间：2018/06/07 Optical Astronomic Time-latitude Residuals  Change Of The Plumb Line  Motion Of The Groundmass  Earthquake   A METHOD OF FORECASTING EARTHQUAKE BY OPTICAL ASTRONOMIC TIME-LATITUDE RESIDUALS 期刊论文  OAI收割 ACTA GEODYNAMICA ET GEOMATERIALIA, 2018, 卷号: 15, 期号: 1, 页码: 17-21 作者:  Su, Youjin;  Gao, Yuping;  Li, Chunxiao;  Hu, Hui   |  收藏  |  浏览/下载：17/0  |  提交时间：2021/11/29 Optical astronomic time-latitude residuals  Change of the plumb line  Motion of the groundmass  Earthquake   Snow cover variability and snowmelt in a high-altitude ungauged catchment SCI/SSCI论文  OAI收割 2015 作者:  Wang R.;  Yao, Z. J.;  Liu, Z. F.;  Wu, S. S.;  Jiang, L. G. 收藏  |  浏览/下载：38/0  |  提交时间：2015/12/09 snow cover  snowmelt  snow melting time  climate change  headwater of  the Yangtze River  baseflow separation methods  yangtze-river basin  climate-change  source  region  water availability  himalayan river  western china  runoff  temperature  glacier   Start of vegetation growing season on the Tibetan Plateau inferred from multiple methods based on GIMMS and SPOT NDVI data SCI/SSCI论文  OAI收割 2015 作者:  Ding M. J.;  Li, L. H.;  Zhang, Y. L.;  Sun, X. M.;  Liu, L. S. 收藏  |  浏览/下载：39/0  |  提交时间：2015/12/09 phenology  NDVI  start of vegetation growing season  method  Tibetan  Plateau  green-up dates  spring phenology  time-series  satellite measurements  northern-hemisphere  carbon balance  climate-change  china  trends  modis