Results 11 to 20 of about 18,503 (265)

Time-frequency analysis of HD 174936 and HD 174966 using the synchrosqueezed wavelet transform

open access: yesFrontiers in Astronomy and Space Sciences, 2022
δ Scuti stars are intermediate-mass pulsators located in the classical Cepheid instability strip with spectral types ranging from A to F. In the last years, some authors found an amplitude and frequency modulation in some of these stars.
A. Ramón-Ballesta   +2 more
doaj   +1 more source

Reseaech on identification of caving coal and rock traits

open access: yesGong-kuang zidonghua, 2017
In order to recognize caving coal and rock traits in fully mechanized caving face, an identification method based on continuous wavelet transform and improved singular value decomposition (SVD) was proposed.
LI Yiming, FU Shichen, LI Rui, WU Miao
doaj   +1 more source

Application of wavelet transform for evaluation of hydrocarbon reservoirs: example from Iranian oil fields in the north of the Persian Gulf [PDF]

open access: yesNonlinear Processes in Geophysics, 2013
The Persian Gulf and its surrounding area are some of the biggest basins and have a very important role in producing huge amounts of hydrocarbon, and this potential was evaluated in order to explore the target for geoscientists and petroleum engineers ...
M. R. Saadatinejad, H. Hassani
doaj   +1 more source

Wavelet-Based Algorithm for Signal Analysis

open access: yesEURASIP Journal on Advances in Signal Processing, 2007
This paper presents a computational algorithm for identifying power frequency variations and integer harmonics by using wavelet-based transform. The continuous wavelet transform (CWT) using the complex Morlet wavelet (CMW) is adopted to detect the ...
Lai LL, Tse Norman CF
doaj   +2 more sources

Generalized Continuous Integral Wavelet Transform and Its Properties

open access: yesRatio Mathematica, 2022
In this paper, the generalized admissibility condition has been obtained and corresponding generalized continuous integral wavelet transforms have been defined. Two new theorems on generalized continuous integral wavelet transforms are established.
Manoj Kumar
doaj   +1 more source

The Time-Scale Interactions between Stock Price and Exchange Rate Volatility in Tehran Stock Exchange [PDF]

open access: yesراهبرد مدیریت مالی, 2018
The purpose of this study was to investigate the relationship between Tehran stock exchange price index and exchange rate changes using the time-scale approach.
ramin khochiany
doaj   +1 more source

Processing ambient noise using wavelet analysis tools: the Iraqi Seismological broadband Network Data at Iraqi Meteorological Organization and seismology (IMOS)

open access: yesKuwait Journal of Science, 2022
The main objective of this research is to reduce the expected error between the original signal polluted by the implicit and estimated noise. The dominance of some levels of the surrounding earthquakes in general on the seismic energy resulting from ...
Hasanain Jasim Mohammed, Ali M. Al-Rahim
doaj   +1 more source

Exploring relationship between crude oil price volatility and stock indices movement using wavelet analysis: evidence from India and China [PDF]

open access: yesVilakshan (XIMB Journal of Management), 2022
Purpose – This study aims to explore the linkage between fluctuations in the global crude oil price and equity market in fast emerging economies of India and China. Design/methodology/approach – The present research uses wavelet decomposition and maximal
Shekhar Mishra, Sathya Swaroop Debasish
doaj   +1 more source

The De-Noising of Sonic Echo Test Data through Wavelet Transform Reconstruction

open access: yesShock and Vibration, 1999
This paper presents the results of feasibility study into the application of the wavelet transform signal processing method to sonic based non-destructive testing techniques.
J.N. Watson, P.S. Addison, A. Sibbald
doaj   +1 more source

JuWavelet – continuous wavelet transform and S transform for wave analysis [PDF]

open access: yesGeoscientific Model Development
This paper describes the Python package JuWavelet, which implements the continuous wavelet transform using the Morlet wavelet, which is a popular tool in the geosciences to analyse wave-like phenomena.
J. Ungermann, R. Reichert, R. Reichert
doaj   +1 more source

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