中国科学院机构知识库网格系统: 检索

Impact of Rapid and Intensive Land Use/Land Cover Change on Soil Properties in Arid Regions: A Case Study of Lanzhou New Area, China 期刊论文 OAI收割
SUSTAINABILITY, 2020, 卷号: 12, 期号: 21, 页码: 16
作者: Zhang, Runxia; Zhao, Xueyong; Zhang, Chencheng; Li, Jing

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收藏 | 浏览/下载：33/0 | 提交时间：2020/12/30

Lanzhou New Area principal component analysis rapid land use change soil physiochemical properties urbanization

A high-resolution speleothem proxy record of the Late Glacial in the European Alps: extending the NALPS19 record until the beginning of the Holocene 期刊论文 OAI收割
JOURNAL OF QUATERNARY SCIENCE, 2020, 页码: 11
作者: Li, Hanying; Spoetl, Christoph; Cheng, Hai

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收藏 | 浏览/下载：43/0 | 提交时间：2020/12/29

Alps Late Glacial rapid climate change speleothems Younger Dryas

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：61/0 | 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.

Millennial-scale evolution of elemental ratios in bulk sediments from the western Philippine Sea and implications for chemical weathering in Luzon since the Last Glacial Maximum 期刊论文 OAI收割
JOURNAL OF ASIAN EARTH SCIENCES, 2019, 卷号: 179, 页码: 127-137
作者: Xiong, Zhifang; Li, Tiegang; Jiang, Fuqing; Chang, Fengming; Chen, Shuangxi

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收藏 | 浏览/下载：64/0 | 提交时间：2019/08/29

Detrital fraction Sea level Air temperature and rainfall Sediment remobilization Rapid change

The cost of rapid and haphazard urbanization: lessons learned from the Freetown landslide disaster 期刊论文 OAI收割
LANDSLIDES, 2019, 卷号: 16, 期号: 6, 页码: 1167-1176
作者: Cui, Yifei; Cheng, Deqiang; Choi, Clarence E.; Jin, Wen; Lei, Yu

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收藏 | 浏览/下载：89/0 | 提交时间：2019/06/12

Rapid urbanization Haphazard urban planning Geo-hazards Disaster Land-use change

Glacial Lakes in the Nepal Himalaya: Inventory and Decadal Dynamics (1977-2017) 期刊论文 OAI收割
REMOTE SENSING, 2018, 卷号: 10, 期号: 12, 页码: 文献号 1913
作者: Zhang, GQ (Zhang, Guoqing); Khadka, N (Khadka, Nitesh); Thakuri, S (Thakuri, Sudeep)

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收藏 | 浏览/下载：63/0 | 提交时间：2019/05/09

Mount Everest Region Difference Water Index Outburst Flood Risk Tibetan Plateau Supraglacial Ponds Rapid Expansion Climate-change Koshi Basin River-basin Precipitation

Effects of Urbanization-Induced Cultivated Land Loss on Ecosystem Services in the North China Plain SCI/SSCI论文 OAI收割
2015
作者: Song W.; Deng, X. Z.

收藏 | 浏览/下载：44/0 | 提交时间：2015/12/09

urban heat islands rapid urbanization climate-change time-series impacts expansion pollution area biodiversity transitions

Factors Influencing the Conversion of Arable Land to Urban Use and Policy Implications in Beijing, China SCI/SSCI论文 OAI收割
2015
作者: Huang D. Q.; Jin, H. R.; Zhao, X. S.; Liu, S. H.

收藏 | 浏览/下载：29/0 | 提交时间：2015/12/09

arable land conversion sustainable development logistic regression Beijing China planning policy rapid urbanization cropland abandonment smart growth cover change landscapes pattern sustainability fragmentation consequences determinants

Changes in land use of a village driven by over 25 years of tourism: The case of Gougezhuang village, China SCI/SSCI论文 OAI收割
2014
Xi J. C.; Zhao M. F.; Ge Q. S.; Kong Q. Q.

收藏 | 浏览/下载：39/0 | 提交时间：2014/12/24

Land use change Rural tourism Sustainable development Tourism village urban sprawl community participation developing-countries farmland conversion rapid urbanization rural settlements driving forces coastal china region gis

Assessment of decoupling between rural settlement area and rural population in China SCI/SSCI论文 OAI收割
2014
作者: Song W.

收藏 | 浏览/下载：24/0 | 提交时间：2014/12/24

Rural settlement Rural population Decoupling Village-hollowing Restricted property house China land-use change residential land interprovincial migration rapid urbanization cultivated land driving forces tm images patterns region dynamics