中国科学院机构知识库网格系统: 检索

Characteristics of wave propagation in thermoelastic medium 期刊论文 OAI收割
CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION, 2021, 卷号: 64, 期号: 4, 页码: 1364-1374
作者: Hou WanTing; Fu LiYun; Wei Jia; Wang ZhiWei

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收藏 | 浏览/下载：52/0 | 提交时间：2021/10/19

Thermoelastic medium Propagation of elastic wave Dispersion analysis Green's function Numerical simulation Influence of thermal medium parameters

Dissecting emotion and user influence in social media communities: An interaction modeling approach 期刊论文 OAI收割
INFORMATION & MANAGEMENT, 2020, 卷号: 57, 期号: 1, 页码: 16
作者: Chung, Wingyan; Zeng, Daniel

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收藏 | 浏览/下载：46/0 | 提交时间：2020/04/07

Emotion Network analysis Sentiment analysis Social media analytics Emotion extraction Influence modeling Causal modeling Social computing Border security

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：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.

Effects of rapid urbanization on vegetation cover in the metropolises of China over the last four decades 期刊论文 OAI收割
ECOLOGICAL INDICATORS, 2019, 卷号: 107, 页码: 11
作者: Du, Jiaqiang; Fu, Qing; Fang, Shifeng; Wu, Jinhua; He, Ping

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收藏 | 浏览/下载：27/0 | 提交时间：2020/05/19

Nighttime light data Normalized difference vegetation index (NDVI) Urbanized area Buffers Comparative analysis The valid influence distance

Multi-factor identification and modelling analyses for managing large river algal blooms 期刊论文 OAI收割
ENVIRONMENTAL POLLUTION, 2019, 卷号: 254, 页码: 11
作者: Xia, Rui; Zhang, Yuan; Wang, Gangsheng; Zhang, Yongyong; Dou, Ming

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收藏 | 浏览/下载：52/0 | 提交时间：2020/05/19

Cause analysis Multifactor influence Modelling research River algal bloom Water project

黄海桑沟湾水体及沉积物中微塑料污染特征研究 期刊论文 OAI收割
海洋环境科学, 2019, 卷号: 38, 期号: 2, 页码: 198-204
作者: 熊宽旭; 赵新月; 周倩; 付传城; 涂晨

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收藏 | 浏览/下载：40/0 | 提交时间：2020/06/17

桑沟湾微塑料潮滩丰度空间分布 Sanggou bay microplastics tidal flats abundance spatial distribution In recent years,research on microplastics pollution in the marine environment has been increasing,but studies on microplastics in water bodies and sediments of the bay under the influence of high-intensity human activities are still rarely reported. In this study,the pollution characteristics of microplastics in the wayer and sediments of Sanggou bay were investigated in December 2017,after the harvest of large-scale aquaculture,with the aim to study the effects of aquaculture activities and hydrodynamics on pollution characteristics and spatial distribution of microplastics in the bay. The results showed that the types of microplastics in the water and sediments of Sanggou bay were mainly fibers,fragments,films,foams and particles. The microplastic abundances in the water and sediments were 1.8 ~ 31.2 N/L,31.2 ~ 1246.8 N/kg,respectively. The average particle sizes of microplastics in water and sediments were 0.51 0.20 mm and 1.54 1.02 mm,respectively. The results of spatial distribution of microplastics in Sanggou bay showed that the high abundance area mainly appears in the inshore waters,and the abundance of microplastics tends to decrease from the inner areas of estuary to the outshore areas. The heterogeneity of microplastic abundance and spatial distribution in Sanggou bay is mainly affected by human activities such as aquaculture,living and shipping,as well as hydrodynamics. In the future,fine sampling and analysis are needed to fully understand the temporal and spatial distribution of microplastics pollution in the bay areas.

A Quantitative Study of Factors Influence on Evacuation in Building Fire Emergencies 期刊论文 OAI收割
IEEE Transactions on Computational Social Systems, 2018, 卷号: 5, 期号: 2, 页码: 544-552
作者: Yuling Hu; Xiao Wang; Fei-Yue Wang

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收藏 | 浏览/下载：15/0 | 提交时间：2018/10/09

Artificial Evacuation Systems Building Fire Computational Experiments Evacuation Strategies Influence Factor Quantitative Analysis.

A bibliometric review on natural resource accounting during 1995-2014 期刊论文 OAI收割
JOURNAL OF CLEANER PRODUCTION, 2016, 卷号: 139, 页码: 122-132
作者: Gao, Cuixia; Zhong, Shaozhuo; Geng, Yong; Liu, Wenjing; Chen, Wei

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收藏 | 浏览/下载：27/0 | 提交时间：2019/06/04

Natural Resource Accounting Bibliometric Analysis Social Network Analysis Academic Influence

eMood: Modeling Emotion for Social Media Analytics on Ebola Disease Outbreak 会议论文 OAI收割
the 2015 International Conference on Information Systems (ICIS 2015), Fort Worth, Texas, USA, 2015-12-13 ~ 2015-12-16
作者: Chung, Wingyan; He, Saike; Zeng, Daniel

收藏 | 浏览/下载：34/0 | 提交时间：2016/04/03

Social Media Analytics Sentiment Analysis Social Network Analysis Emotion Extraction Influence Measure Social Intelligence Public Health Informatics Ebola Disease Outbreak

Emotion Extraction and Entrainment in Social Media: The Case of U.S. Immigration and Border Security 会议论文 OAI收割
IEEE International Conference on Intelligence and Security Informatics (IEEE ISI 2015), Baltimore, MD, USA, 2015-5-27 ~ 2015-5-29
作者: Chung, Wingyan; He, Saike; Zeng, Daniel; Benjamin, Victor

收藏 | 浏览/下载：146/0 | 提交时间：2016/04/03

Emotion Social Media Analytics Text Mining Social Network Analysis Entrainment Influence U.S. immigration policy Border Security