Results 11 to 20 of about 1,178,019 (215)

The Preliminary Investigation of Communication Characteristics Using Evaporation Duct across the Taiwan Strait

Journal of Marine Science and Engineering, 2022
Affected by the Taiwan Strait Warm Current, the evaporation intensity around the Taiwan Strait is significantly higher than in other southern and eastern coastal areas of China.
Cheng Yang, Yafei Shi, Jian Wang
doaj   +2 more sources

Estimating Range-Dependent Evaporation Duct Height

Journal of Atmospheric and Oceanic Technology, 2017
AbstractThe refractivity from clutter (RFC) technique has been proved to be an effective way to estimate atmospheric duct structure. An important issue for RFC is how to make the estimate more robust, especially in range-dependent ducting conditions. Traditionally, statistical inversion methods need a large number of forward propagation model runs to ...
Xiaofeng Zhao, Caglar Yardim, Dongxiao Wang, Bruce M. Howe   +3 more
openaire   +2 more sources

Near-Surface Thermodynamic Influences on Evaporation Duct Shape [PDF]

Atmosphere
This study utilizes in situ measurements and numerical weather prediction forecasts curated during the Coupled Air–Sea Processes Electromagnetic Ducting Research (CASPER) east field campaign to assess how thermodynamic properties in the marine ...
Sarah E. Wessinger, Daniel P. Greenway, Tracy Haack, Erin E. Hackett   +3 more
doaj   +3 more sources

The Effect of Boreal Summer Intraseasonal Oscillation on Evaporation Duct and Electromagnetic Propagation over the South China Sea

Atmosphere, 2020
Intraseasonal oscillation of the evaporation duct, lasting 30–60 days, has been identified over the South China Sea (SCS) summer monsoon region based on multiple reanalyses and observational data.
Wentao Jia, Weimin Zhang, Jiahua Zhu, Jilin Sun   +3 more
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Evaporation Duct Anomalies Caused by Mesoscale Eddies in the Kuroshio Extension

Geophysical Research Letters
Evaporation duct anomalies are always present above various oceanic processes, and their response to ubiquitous mesoscale eddies in the Kuroshio Extension region is quantitatively analyzed for the first time in this study using a synthetic analysis ...
Yuan Gao, Yongchui Zhang, Xiaofeng Zhao, Yang Shi, Xiangming Guo, Bo Wang   +5 more
doaj   +2 more sources

XGB Model : Research on Evaporation Duct Height Prediction Based on XGBoost Algorithm [PDF]

Radioengineering, 2020
Evaporation duct is a specific atmospheric structure at sea, which has an important influence on the propagation path of electromagnetic waves (EW).
W. P. Zhao, J. Li, J. Zhao, D. Zhao, J. Lu, X. Wang   +5 more
doaj   +3 more sources

A Multi-Dimensional Deep-Learning-Based Evaporation Duct Height Prediction Model Derived from MAGIC Data

Remote Sensing, 2022
The evaporation duct height (EDH) can reflect the main characteristics of the near-surface meteorological environment, which is essential for designing a communication system under this propagation mechanism. This study proposes an EDH prediction network
Cheng Yang, Jian Wang, Yafei Shi
doaj   +2 more sources

Application of the PJ and NPS evaporation duct models over the South China Sea (SCS) in winter.

PLoS ONE, 2017
The detection of duct height has a significant effect on marine radar or wireless apparatus applications. The paper presents two models to verify the adaptation of evaporation duct models in the SCS in winter. A meteorological gradient instrument used to
Shaobo Yang, Xingfei Li, Chao Wu, Xin He, Ying Zhong   +4 more
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A New Diagnostic Model and Improved Prediction Algorithm for the Heights of Evaporation Ducts

Frontiers in Earth Science, 2020
This paper develops a new method for the diagnosis and prediction of the evaporation duct heights on the sea, which has certain reference significance for the study of the evaporation ducts.
Yanbo Mai, Zheng Sheng, Zheng Sheng, Hanqing Shi, Chaolei Li, Lihang Liu, Qixiang Liao, Wei Zhang, Shudao Zhou, Shudao Zhou   +9 more
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Variability of Silver Fir Needle (Abies alba Mill.) Anatomical Features in the Southeast Europe Natural Populations [PDF]

Plants
The survival of marginal/peripheral silver fir (Abies alba Mill.) populations in the broader region of Southeast Europe is endangered due to climate change and population decline. This study aimed to determine the level and pattern of variability for the
Vladan Popović, Aleksandar Lučić, Ljubinko Rakonjac, Aleksandar Vemić, Sanja Jovanović, Biljana M. Nikolić, Danijela Miljković   +6 more
doaj   +2 more sources