Results 21 to 30 of about 116,582 (263)

Compressive Downlink Channel Estimation for FDD Massive MIMO Using Weighted $l_{p}$ Minimization

IEEE Access, 2019
We propose a weighted Ip minimization method for downlink channel estimation in frequency division duplexing massive multiple-input multiple-output (MIMO) systems.
Wei Lu, Yongliang Wang, Xiaoqiao Wen, Xiaoqiang Hua, Shixin Peng, Liang Zhong   +5 more
doaj   +1 more source

Extreme Drought Events over Brazil from 2011 to 2019

Atmosphere, 2019
Drought-related disasters are among the natural disasters that are able to cause large economic and social losses. In recent years, droughts have affected different regions of Brazil, impacting water, food, and energy security. In this study, we used the
Ana Paula M. A. Cunha, Marcelo Zeri, Karinne Deusdará Leal, Lidiane Costa, Luz Adriana Cuartas, José Antônio Marengo, Javier Tomasella, Rita Marcia Vieira, Alexandre Augusto Barbosa, Christopher Cunningham, João Victor Cal Garcia, Elisangela Broedel, Regina Alvalá, Germano Ribeiro-Neto   +13 more
doaj   +1 more source

Research on targeted service technology for early warning information of meteorological disaster based on NLP [PDF]

ITM Web of Conferences, 2022
Affected by global climate change and the superposition of urban construction, the climate of city meteorological guarantee service puts forward new requirements and new challenges.
Feng Yuxing, Tang Wei, Wang Muhua, Cao Zhiyu, Qiao Liang, Cui Lei   +5 more
doaj   +1 more source

Mapping data gaps to estimate biomass across Brazilian Amazon forests

Forest Ecosystems, 2020
Background Tropical forests play a fundamental role in the provision of diverse ecosystem services, such as biodiversity, climate and air quality regulation, freshwater provision, carbon cycling, agricultural support and culture.
Graciela Tejada, Eric Bastos Görgens, Alex Ovando, Jean Pierre Ometto   +3 more
doaj   +1 more source

Construction of Strategic Early-Warning System in Cyberspace

中国工程科学, 2021
Cyberspace strategic early-warning is a monitoring and warning system that is established by a country or group for early detection, tracking, identification, and notification of incoming major cyber attacks or the spreading destruction of powerful ...
Zhuang Honglin, Yao Le, Wang Sheng, Gu Jiaxiang, Wu Ye, Xie Kai   +5 more
doaj   +1 more source

China agricultural outlook for 2015–2024 based on China Agricultural Monitoring and Early-warning System (CAMES)

Journal of Integrative Agriculture, 2015
The primary goal of Chinese agricultural development is to guarantee national food security and supply of major agricultural products. Hence, the scientific work on agricultural monitoring and early warning as well as agricultural outlook must be ...
Shi-wei XU, Gan-qiong LI, Zhe-min LI
doaj   +1 more source

Evaluation of scrub typhus diagnosis in China: analysis of nationwide surveillance data from 2006 to 2016

Infectious Diseases of Poverty, 2019
Background Scrub typhus is a life-threatening disease caused by Orientia tsutsugamushi, and specific antimicrobial medicine is available. Early and accurate diagnosis is essential for reducing the risk of severe complications and death. In this study, we
Hua-Lei Xin, Jian-Xing Yu, Mao-Gui Hu, Fa-Chun Jiang, Xiao-Jing Li, Li-Ping Wang, Ji-Lei Huang, Jin-Feng Wang, Jun-Ling Sun, Zhong-Jie Li   +9 more
doaj   +1 more source

Using Quantile Regression Approach to Analyze Price Movements of Agricultural Products in China

Journal of Integrative Agriculture, 2012
This paper studies how the price movements of pork, chicken and egg respond to those of related cost factors in short terms in Chinese market. We employ a linear quantile approach not only to explore potential data heteroscedasticity but also to generate
Gan-qiong LI, Shi-wei XU, Zhe-min LI, Yi-guo SUN, Xiao-xia DONG   +4 more
doaj   +1 more source

Improvement of the computational efficiency in SVD-3DEnVar data assimilation scheme and its preliminary application to the TRAMS 3.0 model [PDF]

Geoscientific Model Development
Although the Singular Value Decomposition-three Dimensional Ensemble Variational (SVD-3DEnVar) data assimilation scheme has achieved successful application in real case simulations with comprehensive numerical weather prediction models, its computational
K. Liu, K. Liu, K. Liu, D. Xu, F. Zheng, J. He, C. Li, J. C.-H. Leung, M. Zhang, D. Zhao, Q. He, Y. Zhang, Y. Li, B. Zhang   +13 more
doaj   +1 more source

Research of Synergy Warning System for Gas Outburst Based on Entropy-Weight Bayesian

International Journal of Computational Intelligence Systems, 2020
Based on the statistical analysis of coal occurrence characteristics, and dynamic phenomena of coal and rock in Qianjiaying coal mine, China, an area–local outburst early warning system based on outburst key factors and early warning indicators was ...
Jiayong Zhang, Zibo Ai, Liwen Guo, Xiao Cui   +3 more
doaj   +1 more source