中国科学院机构知识库网格系统: 检索

Unprecedented decline in summertime surface ozone over eastern China in 2020 comparably attributable to anthropogenic emission reductions and meteorology 期刊论文 OAI收割
ENVIRONMENTAL RESEARCH LETTERS, 2021, 卷号: 16
作者: Yin, Hao; Lu, Xiao; Sun, Youwen; Li, Ke; Gao, Meng

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收藏 | 浏览/下载：32/0 | 提交时间：2022/01/10

ozone changes anthropogenic emission reductions meteorology GEOS-Chem-XGBoost ozone mitigation

Winter AOD trend changes over the Eastern Mediterranean and Middle East region 期刊论文 OAI收割
INTERNATIONAL JOURNAL OF CLIMATOLOGY, 2021, 页码: 20
作者: Shaheen, Abdallah; Wu, Renguang; Lelieveld, Jos; Yousefi, Robabeh; Aldabash, Midyan

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收藏 | 浏览/下载：27/0 | 提交时间：2021/06/10

aerosol optical depth trends dust emission changes Eastern Mediterranean and Middle East meteorological factors

Litter and microclimate controls on soil heterotrophic respiration after converting seasonal rainforests to rubber plantations in tropical China 期刊论文 OAI收割
AGRICULTURAL AND FOREST METEOROLOGY, 2021, 卷号: 310, 期号: x, 页码: -
作者: Zhang, Min; Feng, Wenting

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收藏 | 浏览/下载：90/0 | 提交时间：2021/10/21

CO2 emission land use changes Q(10) soil moisture translocation experiment

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：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.

Inter-annual variability of wintertime PM2.5 chemical composition in Xi'an, China: Evidences of changing source emissions 期刊论文 OAI收割
SCIENCE OF THE TOTAL ENVIRONMENT, 2016, 卷号: 545, 期号: 2017, 页码: 546-555
作者: Xu, Hongmei; Chen, L. W. Antony; Shen, Zhenxing; Huang, R-J.; Cao, Junji

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收藏 | 浏览/下载：18/0 | 提交时间：2018/10/29

Pm2.5 Source Apportionment Emission Changes China Aerosols Fugitive Dust

Chromophoric Dissolved Organic Matter Fluctuation Assessment in an Urban River 期刊论文 iSwitch采集
CLEAN-SOIL AIR WATER, 2015, 卷号: 43, 期号: 8, 页码: 1128-1135
作者: Liang, Yuting; Xiao, Xian; Du, Erdeng; Song, Chengjie; Song, Chaopeng

收藏 | 浏览/下载：51/0 | 提交时间：2019/10/10

Fluorescence excitation-emission matrix Microbial biodegradation Parallel factor analysis Spatio-temporal changes Water quality mitigation

北京市城镇典型家庭消费碳排放特征及影响因素分析 学位论文 OAI收割
硕士, 北京: 中国科学院研究生院, 2015
作者: 郭振

收藏 | 浏览/下载：101/0 | 提交时间：2016/07/21

北京市，家庭消费，碳排放，时空差异，影响因素，能源消费终端，Beijing city, household consumption, carbon emission, spatial-temporal changes, influence factors, endpoint of enery consumption

Label-free G-quadruplex-specific fluorescent probe for sensitive detection of copper(II) ion 期刊论文 OAI收割
biosensors & bioelectronics, 2013, 卷号: 39, 期号: 1, 页码: 268-273
Zhang LB; Zhu JB; Ai J; Zhou ZX; Jia XF; Wang EK

收藏 | 浏览/下载：29/0 | 提交时间：2014/04/16

ATOMIC-ABSORPTION SPECTROMETER PROTOPORPHYRIN-IX AQUEOUS-SOLUTION EMISSION-SPECTROMETRY STRUCTURAL-CHANGES CATALYTIC BEACON POTASSIUM-ION DNA BINDING DNAZYME

Food benefit and climate warming potential of nitrogen fertilizer uses in China SCI/SSCI论文 OAI收割
2012
Tian H. Q.; Lu C. Q.; Melillo J.; Ren W.; Huang Y.; Xu X. F.; Liu M. L.; Zhang C.; Chen G. S.; Pan S. F.; Liu J. Y.; Reilly J.

收藏 | 浏览/下载：19/0 | 提交时间：2014/12/24

China crop yield CO2 uptake N2O emission nitrogen fertilizer multifactor environmental-changes n2o emissions soil carbon croplands management co2

Ultrafast optical switching in Kerr nonlinear photonic crystals 期刊论文 OAI收割
FRONTIERS OF PHYSICS IN CHINA, 2010, 卷号: 5, 期号: 3, 页码: 220
Liu, Y; Qin, F; Zhou, F; Meng, QB; Zhang, DZ; Li, ZY

收藏 | 浏览/下载：24/0 | 提交时间：2013/09/23

BAND-GAP MATERIALS MACH-ZEHNDER INTERFEROMETERS NANOPHOTONIC WAVE-GUIDES REFRACTIVE-INDEX CHANGES SPONTANEOUS-EMISSION COLLOIDAL CRYSTALS GRATING COUPLERS SILICON CHIP DEFECT MODES ON-CHIP