中国科学院机构知识库网格系统: 检索

Dynamic assessment of the COVID-19 lockdown in the Xinjiang region using night-time light remote sensing 期刊论文 OAI收割
INTERNATIONAL JOURNAL OF DIGITAL EARTH, 2023, 卷号: 17, 期号: 1, 页码: 2300731
作者: Jiang, Luguang; Liu, Ye

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收藏 | 浏览/下载：33/0 | 提交时间：2024/02/05

Xinjiang region COVID-19 lockdown night-time light remote sensing spatiotemporal changes comparative analysis human activity intensity

Mapping the spatial-temporal changes in energy consumption-related carbon emissions in the Beijing-Tianjin-Hebei region via nighttime light data 期刊论文 OAI收割
SUSTAINABLE CITIES AND SOCIETY, 2023, 卷号: 94, 页码: 104476
作者: Zhang, Xueru; Cai, Zhuoya; Song, Wei; Yang, Dazhi

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收藏 | 浏览/下载：15/0 | 提交时间：2023/06/10

Nighttime light data Energy consumption Carbon emissions Inversion Spatial -temporal changes Low carbon development

Photoinhibition of Photosystem I Induced by Different Intensities of Fluctuating Light Is Determined by the Kinetics of increment pH Formation Rather Than Linear Electron Flow 期刊论文 OAI收割
ANTIOXIDANTS, 2022, 卷号: 11, 期号: 12, 页码: 2325
作者: Shi, Qi; Wang, Xiao-Qian; Zeng, Zhi-Lan; Huang, Wei

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收藏 | 浏览/下载：10/0 | 提交时间：2024/04/30

electron transport fluctuating light photosystem I photoinhibition proton gradient PROTON MOTIVE FORCE FLAVODIIRON PROTEINS ABSORBENCY CHANGES PHOTOSYNTHESIS TRANSPORT PHOTOPROTECTION GROWTH PHOTORESPIRATION CYCLE PSI

Dependence of the rate-limiting steps in the dark-to-light transition of photosystem II on the lipidic environment of the reaction center 期刊论文 OAI收割
PHOTOSYNTHETICA, 2022, 卷号: 60, 期号: 1, 页码: 147-156
作者: Magyar, M.; Akhtar, P.; Sipka, G.; Han, W.; LI, X.

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收藏 | 浏览/下载：26/0 | 提交时间：2024/03/07

closed state of PSII conformational chang dielectric relaxation light-adapted state of PSII light-induced changes proteoliposomes

The braking index of PSR B0540-69 and the associated pulsar wind nebula emission after spin-down rate transition 期刊论文 OAI收割
Monthly Notices of the Royal Astronomical Society, 2020, 卷号: 494, 页码: 1865-1870
作者: HXMT

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收藏 | 浏览/下载：58/0 | 提交时间：2022/02/08

stars: magnetic field stars: neutron pulsars: general Astrophysics - High Energy Astrophysical Phenomena Abstract: In 2011 December, PSR B054-69 experienced a spin-down rate transition (SRT), after which the spin-down power of the pulsar increased by $\sim 36{{\ \rm per\ cent}}$. About 1000 d after the SRT, the X-ray luminosity of the associated pulsar wind nebula (PWN) was found to brighten by $32\pm 8{{\ \rm per\ cent}}$. After the SRT, the braking index n of PSR B0540-69 changes from n = 2.12 to 0.03 and then keeps this value for about five years before rising to n = 0.9 in the following years. We find that most of the current models have difficulties in explaining the measured braking index. One exceptive model of the braking index evolution is the increasing dipole magnetic field of PSR B0540-69. We suggest that the field increase may result from some instabilities within the pulsar core that enhance the poloidal component at the price of toroidal component of the magnetic field. The increasing dipole magnetic field will result in the X-ray brightening of the PWN. We fit the PWN X-ray light curve by two models: one assumes a constant magnetic field within the PWN during the brightening and the other assumes an enhanced magnetic field proportional to the energy density of the PWN. It appears that the two models fit the data well, though the later model seems to fit the data a bit better. This provides marginal observational evidence that magnetic field in the PWN is generated by the termination shock. Future high-quality and high-cadence data are required to draw a solid conclusion.

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.

Spatiotemporal changes in vegetation coverage and its causes in China since the Chinese economic reform 期刊论文 OAI收割
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH, 2019, 页码: 16
作者: Du, Jiaqiang; Quan, Zhanjun; Fang, Shifeng; Liu, Chengcheng; Wu, Jinhua

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收藏 | 浏览/下载：67/0 | 提交时间：2020/05/19

NDVI Dynamics Climate changes Human activities Nighttime light data

The Impacts of Human Activities on Ecosystems within China's Nature Reserves 期刊论文 OAI收割
SUSTAINABILITY, 2019, 卷号: 11, 期号: 23, 页码: 17
作者: Zhu, Ping; Cao, Wei; Huang, Lin; Xiao, Tong; Zhai, Jun

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收藏 | 浏览/下载：21/0 | 提交时间：2020/05/19

national nature reserves human activities land cover changes nighttime light vegetation fraction net primary productivity China

The Impacts of Human Activities on Ecosystems within China's Nature Reserves 期刊论文 OAI收割
SUSTAINABILITY, 2019, 卷号: 11, 期号: 23, 页码: 17
作者: Zhu, Ping; Cao, Wei; Huang, Lin; Xiao, Tong; Zhai, Jun

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收藏 | 浏览/下载：22/0 | 提交时间：2020/05/19

national nature reserves human activities land cover changes nighttime light vegetation fraction net primary productivity China

Seasonal changes in labile organic matter as a function of environmental factors in a relict permafrost region on the qinghai-tibetan plateau 期刊论文 iSwitch采集
Catena, 2019, 卷号: 180, 页码: 194-202
作者: Liu, Guimin; Zhang, Xiaolan; Wu, Tonghua; Wu, Xiaoli; Smoak, Joseph M.

收藏 | 浏览/下载：411/0 | 提交时间：2019/10/08

Relict permafrost Light fraction organic carbon Water extractable organic carbon Seasonal changes Depth