Propagation direction analyses of medium‐scale traveling ionospheric disturbances observed over North America with GPS‐TEC perturbation maps by three‐dimensional spectral analysis method

2022 ◽  
Author(s):  
Septi Perwitasari ◽  
Takuji Nakamura ◽  
Takuya Tsugawa ◽  
Michi Nishioka ◽  
Yoshihiro Tomikawa ◽  
...  
Keyword(s):  
Spectral Analysis ◽  
North America ◽  
Three Dimensional ◽  
Propagation Direction ◽  
Ionospheric Disturbances ◽  
Analysis Method ◽  
Medium Scale ◽  
Gps Tec ◽  
Spectral Analysis Method ◽  
Perturbation Maps

scholarly journals A mathematical approach to improving the representation of surface water–groundwater exchange in the hyporheic zone

2020 ◽  
Author(s):  
Bowen He ◽  
Qun Guan
Keyword(s):  
Spectral Analysis ◽  
Land Surface ◽  
Hyporheic Zone ◽  
Exact Analytical Solution ◽  
Three Dimensional ◽  
Hyporheic Exchange ◽  
Analysis Method ◽  
Spectral Analysis Method ◽  
Groundwater Exchange ◽  
Fourier Fitting

Abstract It is well known that land surface topography governs surface–groundwater interactions under some circumstances and can be separated in a Fourier-series spectrum that provides an exact analytical solution of both the surface and the underlying three-dimensional groundwater flows. We evaluate the performance of the current Fourier fitting process by testing on different scenarios of synthetic surfaces. We identify a technical gap and propose a new version of the approach which incorporates the spectral analysis method to help identify the statistically significant frequencies of the surface to guide the refinement and mesh. Our results show that spectral analysis is the method that can help improve the accuracy of representing the surface, thus further improving the accuracy of predicting the bedform-driven hyporheic exchange flows.

An Adaptive Graph Spectral Analysis Method for Feature Extraction of an EEG Signal

2019 ◽  
Vol 19 (5) ◽  
pp. 1884-1896 ◽  
Author(s):  
Shanzhi Xu ◽  
Hai Hu ◽  
Linhong Ji ◽  
Peng Wang
Keyword(s):  
Feature Extraction ◽  
Spectral Analysis ◽  
Eeg Signal ◽  
Analysis Method ◽  
Spectral Analysis Method

scholarly journals Residual Network Structure-based High Accuracy Spectral Analysis Method

2019 ◽  
Vol 15 (11) ◽  
pp. 3090
Author(s):  
Wu Sai ◽  
Wang Zhihui ◽  
Meng Sachura ◽  
Zheng Weijun ◽  
Shao Weiping
Keyword(s):  
Spectral Analysis ◽  
Network Structure ◽  
High Accuracy ◽  
Analysis Method ◽  
Residual Network ◽  
Spectral Analysis Method

scholarly journals Spectral whitening based on the singular spectral analysis method

2018 ◽  
Vol 15 (4) ◽  
pp. 1460-1469 ◽  
Author(s):  
Rafael R Manenti ◽  
Wilker E Souza ◽  
Milton J Porsani
Keyword(s):  
Spectral Analysis ◽  
Analysis Method ◽  
Singular Spectral Analysis ◽  
Spectral Analysis Method
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