Results 21 to 30 of about 1,178,019 (215)

Validation of atmospheric evaporation duct in the eastern Indian Ocean [PDF]

Frontiers in Earth Science
An atmospheric duct is an anomalous atmospheric structural phenomenon that causes trap refraction in the troposphere to change the propagation paths and ranges of electromagnetic waves, thereby increasing the detection distances of radar and other ...
Zhe Qi, Zhe Qi, Huabin Mao, Huabin Mao, Chunhua Qiu, Yongfeng Qi, Yongfeng Qi   +6 more
doaj   +2 more sources

Making Sweat Measurable: Induction, Sampling, and Refreshment in Wearable Biofluid Sensing. [PDF]

Adv Sci (Weinh)
Wearable sweat sensing relies not only on chemical detection but also on controlled biofluid management. This Review integrates sweat physiology, induction strategies, and microfluidic sampling architectures, demonstrating how flux, transport, and refreshment shape measurement reliability.
Shin S, Gao W.
europepmc   +2 more sources

EDH-STNet: An Evaporation Duct Height Spatiotemporal Prediction Model Based on Swin-Unet Integrating Multiple Environmental Information Sources

Remote Sensing
Given the significant spatial non-uniformity of marine evaporation ducts, accurately predicting the regional distribution of evaporation duct height (EDH) is crucial for ensuring the stable operation of radio systems.
Hanjie Ji, Lixin Guo, Jinpeng Zhang, Yiwen Wei, Xiangming Guo, Yusheng Zhang   +5 more
doaj   +3 more sources

Atmospheric Ducts and Their Electromagnetic Propagation Characteristics in the Northwestern South China Sea

Remote Sensing, 2023
The propagation of electromagnetic waves beyond the line of sight can be caused by atmospheric ducts, which are significant concerns in the fields of radar and communication.
Ning Yang, Debin Su, Tao Wang
doaj   +1 more source

A Comparison of the Machine Learning Algorithm for Evaporation Duct Estimation

Radioengineering, 2013
In this research, a comparison of the relevance vector machine (RVM), least square support vector machine (LSSVM) and the radial basis function neural network (RBFNN) for evaporation duct estimation are presented.
C. Yang
doaj   +1 more source

Experimental Analysis of Atmospheric Ducts and Navigation Radar Over-the-Horizon Detection

Remote Sensing, 2022
Since the height of sea detection radar antenna and ship targets is relatively low, it is generally believed that its over-the-horizon detection is mainly caused by the evaporation duct at sea.
Li-Feng Huang, Cheng-Guo Liu, Hong-Guang Wang, Qing-Lin Zhu, Li-Jun Zhang, Jie Han, Yu-Sheng Zhang, Qian-Nan Wang   +7 more
doaj   +1 more source

NWPP-EDH: Numerical weather prediction products evaporation duct regional prediction model

Frontiers in Earth Science, 2023
The evaporation duct is a special atmospheric stratification that can affect the propagation path of electromagnetic waves at sea, thus it is crucial for the ability of the radio communication systems.
Xingyu Chai, Jincai Li, Jun Zhao, Yifan Hu, Yifan Hu, Xiaofeng Zhao   +5 more
doaj   +1 more source

Performance analysis of code division multiplexing communication under evaporation duct environment

Frontiers in Signal Processing, 2022
The evaporation duct is an effective means for realizing non-line-of-sight (NLOS) wireless transmission over the sea. However, the effects of marine weather conditions on electromagnetic propagation have rarely been studied.
Wenjing Liu, Xiqing Liu, Shi Yan, Linglan Zhao, Mugen Peng   +4 more
doaj   +1 more source

The influence of seasonal and nonreciprocal evaporation duct on electromagnetic wave propagation in the Gulf of Aden

Results in Physics, 2020
In this paper, the adaptability of ERA5 reanalysis data in the Gulf of Aden was validated by the data of shipborne sensors. Based on the reanalysis data, the seasonal distribution of nonreciprocal evaporation duct in the Gulf of Aden was obtained with PJ
Bin Tian, Qianqian Liu, Jun Lu, Xiaoguang He, Guodong Zeng, Liu Teng   +5 more
doaj   +1 more source

Application of Machine Learning in the Research of Evaporation Duct Height: A review

Journal of Physics: Conference Series, 2022
Abstract Evaporation duct is a kind of special atmospheric stratification that frequently appears on the sea surface, which has an important influence on the propagation and attenuation of electromagnetic waves, and is an important factor affecting the efficiency of marine radars and communication equipment. After the development in more
Xingyu Chai, Jincai Li, Jun Zhao, Xiaofeng Zhao   +3 more
openaire   +1 more source