Results 21 to 30 of about 1,047,980 (279)
Investigation of the characteristics of geoelectric field signals prior to earthquakes using adaptive STFT techniques [PDF]
Natural Hazards and Earth System Sciences, 2013 An earthquake is one of the most destructive natural disasters that can occur, often killing many people and causing large material losses. Hence, the ability to predict earthquakes may reduce the catastrophic effects caused by this phenomenon.
W. Astuti +4 more
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Sensors, 2022 In the image processing method of digital holographic microscopy (DHM), we can obtain a phase information of an object by windowing a sideband in Fourier domain and taking inverse Fourier transform.
Hyun-Woo Kim, Myungjin Cho, Min-Chul Lee
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Dynamic Harmonic Analysis of Long Term over Voltages Based on Time Varying Fourier series in Extended Harmonic Domain [PDF]
AUT Journal of Electrical Engineering, 2016 Harmonics have become an important issue in modern power systems. The widespread penetration of non-linear loads to emerging power systems has turned power quality analysis into an important operation issue under both steady state and transient ...
Ehsan Karami +2 more
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Multi-Target Tracking Using Windowed Fourier Single-Pixel Imaging
Sensors, 2021 The single-pixel imaging (SPI) technique enables the tracking of moving targets at a high frame rate. However, when extended to the problem of multi-target tracking, there is no effective solution using SPI yet. Thus, a multi-target tracking method using
Jinyu Zhang +5 more
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Experimental Study of Transient Flow Regimes in a Model Hydroturbine Draft Tube
Energies, 2021 Swirling flow with the formation of a precessing vortex core (PVC) in the draft tube model of a hydroturbine was studied. Experiments were performed on an aerodynamic setup under transient operating conditions of the hydroturbine.
Ivan Litvinov +3 more
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Inversion formula for the windowed Fourier transform [PDF]
Mathematische Nachrichten, 2012 AbstractIn this paper, we study the inversion formula for recovering a function from its windowed Fourier transform. We give a rigorous proof for an inversion formula which is known in engineering. We show that the integral involved in the formula is convergent almost everywhere on \documentclass{article}\usepackage{amssymb}\begin{document}\pagestyle ...
openaire +2 more sources
IMPROVED TIME-FREQUENCY ANALYSIS ALGORITHM OF BARELY VISIBLE RADAR STATIONS SIGNALS, BASED ON WINDOWED FOURIER TRANSFORM [PDF]
Научно-технический вестник информационных технологий, механики и оптики, 2012 The problem of time-frequency analysis for barely visible radar stations signals, based on windowed Fourier transform was considered. Improved algorithm, based on integration of Fourier transform data was suggested.
A. V. Korotkov, , A. I. Mukhin
doaj
Algorithms, 2023 We report on the development of an optical frequency domain reflectometry (OFDR) system based on a continuous-wave Er-doped self-sweeping fiber laser. In this work, we investigate the influence of the input data processing procedure in an OFDR system on ...
Nikita R. Poddubrovskii +2 more
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Research on harmonic detection based on wavelet threshold and FFT algorithm
Systems Science & Control Engineering, 2018 The fast Fourier transform (FFT) algorithm with window interpolation is the most commonly used and most effective method in harmonic analysis. However, the fast Fourier transform has a great dependence on the quality of the signal, and the existence of ...
Shuaishuai Zhao +2 more
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Random fractional Fourier transform : stochastic perturbations along the axis of propagation [PDF]
, 1999 The fractional Fourier transform (FRT) is known to be optically implementable with use of a medium with a perfect radial quadratic-index profile. Using the quantum-mechanical operator formalism, we examine the effects on the FRT action of such a medium
Abe, Sumiyoshi, Sheridan, John T.
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