A copy of this work was available on the public web and has been preserved in the Wayback Machine. The capture dates from 2017; you can also visit the original URL.
The file type is application/pdf.
Filters
Automated Segmentation of Resistivity Image Logs Using Wavelet Transform
2009
Mathematical Geosciences
Preserved Fulltext
We describe a wavelet-transform-based method for automated segmentation of resistivity image logs that takes into account the apparent dip in the data and addresses the problem of discriminating lithofacies ...
We have developed an algorithm based on this method that might outperform other existing segmentation methods in the cases of low to moderate dip. ...
Open Access This article is distributed under the terms of the Creative Commons Attribution Noncommercial License which permits any noncommercial use, distribution, and reproduction in any medium, provided ...
doi:10.1007/s11004-009-9236-2
fatcat:3tk32uddnfa77pkutgbgz5ibuy
Higher-Order Properties of Analytic Wavelets
2009
IEEE Transactions on Signal Processing
Preserved Fulltext
A copy of this work was available on the public web and has been preserved in the Wayback Machine. The capture dates from 2012; you can also visit the original URL.
The file type is application/pdf.
Other Versions
The influence of higher-order wavelet properties on the analytic wavelet transform behavior is investigated, and wavelet functions offering advantageous performance are identified. ...
This is accomplished through detailed investigation of the generalized Morse wavelets, a two-parameter family of exactly analytic continuous wavelets. ...
mode of the squared modulus of the frequency-domain wavelet. ...
doi:10.1109/tsp.2008.2007607
fatcat:kxbwztophvdaljs22usgi3oqmu
Interaction acoustic waves with a layered structure containing layer of bubbly liquid
2018
MATEC Web of Conferences
Preserved Fulltext
A copy of this work was available on the public web and has been preserved in the Wayback Machine. The capture dates from 2018; you can also visit the original URL.
The file type is application/pdf.
The results of a theoretical study of the effect of a bubble layer on the propagation of acoustic waves through a thin three-layered barrier at various angles of incidence are presented. ...
The barrier consists of a layer of gel with polydisperse air bubbles bounded by layers of polycarbonate. ...
The fast Fourier transform (FFT) method is used for the calculation of the dynamics of small-amplitude pulse perturbations. ...
doi:10.1051/matecconf/201814815006
fatcat:vxtxobr2jzehdidzdkndkfy6zy
Thin-bed prestack spectral inversion
2009
Geophysics
Preserved Fulltext
A copy of this work was available on the public web and has been preserved in the Wayback Machine. The capture dates from 2017; you can also visit the original URL.
The file type is application/pdf.
The results suggest that thin beds can be characterized fully with a moderate to high degree of confidence below tuning, even when using an approximate wavelet spectrum. ...
We carried out the estimation of the thin-bed parameters in the frequency ͑amplitude spectrum͒ domain using simulated annealing. ...
These facts encouraged us to propose a different methodology to characterize thin beds using the amplitude spectra of prestack data, because amplitude-versus-angle ͑AVA͒ anomalies are expected to exist ...
doi:10.1190/1.3148002
fatcat:tz3qhtqphvdafiq4j7tp3xeop4
Seismic Evidence for a Weak Basal Layer During The 1982 Surge of Variegated Glacier, Alaska, U.S.A
1988
Journal of Glaciology
Preserved Fulltext
A copy of this work was available on the public web and has been preserved in the Wayback Machine. The capture dates from 2018; you can also visit the original URL.
The file type is application/pdf.
Both shear (SV) and compressional (P) reflections from the bottom of Variegated Glacier were obtained before the 1982–83 surge event using explosive sources, and the phases of these reflections (relative ...
The unexpected P-wave phase reversal might be explained by a thin, mechanically weak or fluidized basal debris layer during surge which acts as a strong seismic absorber and suppresses multiple reflections ...
Deconvolutions of transverse spread using the source wavelet from the third channel from the top of ( a). ...
doi:10.1017/s0022143000009138
fatcat:7th4q6ayq5ehbk4wnsix42srdq
Analysis of potential field data in the wavelet domain
1999
Geophysical Journal International
Preserved Fulltext
A copy of this work was available on the public web and has been preserved in the Wayback Machine. The capture dates from 2016; you can also visit the original URL.
The file type is application/pdf.
Such a construction leads to relations between the horizontal derivatives of geophysical field measurements at all heights, and the wavelet transform of the zero height field. ...
Some simple, synthetic examples in two dimensions illustrate one inversion approach based upon the maxima of the wavelet transform (multiscale edges). ...
Figure 10 . 10 Modulus of the wavelet transform of the gravitational field Density (g m−3) 0.3 0.32 0.40 0.10 caused by the body shown.
Figure 12 . 12 Model used in the third synthetic test. ...
doi:10.1046/j.1365-246x.1999.00788.x
fatcat:5zrfogkkbjbq3iqwjt7vb2nqwy
Scaling and correlation analysis of galactic images
2001
Monthly notices of the Royal Astronomical Society
Preserved Fulltext
A copy of this work was available on the public web and has been preserved in the Wayback Machine. The capture dates from 2018; you can also visit the original URL.
The file type is application/pdf.
Other Versions
We recommend as the optimal mathematical tool the wavelet spectrum with a suitable choice of the analysing wavelet. ...
We introduce the wavelet cross-correlation function which enables to study the correlation between images as a function of scale. ...
The visit of P.F. to ...
doi:10.1046/j.1365-8711.2001.04812.x
fatcat:nog5amfj3jbwvd6nkkwjqrhgii
Application of Statistical Techniques to the Analysis of Solar Coronal Oscillations
2004
Astrophysical Journal
Preserved Fulltext
A copy of this work was available on the public web and has been preserved in the Wayback Machine. The capture dates from 2017; you can also visit the original URL.
The file type is application/pdf.
The second technique, called complex empirical orthogonal function (CEOF) analysis, is an extension of the well-known principal component analysis, to which the Hilbert transform has been added. ...
The first technique, called empirical mode decomposition, was developed by Huang and coworkers and can be used to decompose a signal in its characteristic timescales, allowing, among other applications ...
Hood for useful discussions and the Spanish Ministry of Science and Technology for the funding provided under grant AYA2003-00123. ...
doi:10.1086/423332
fatcat:zjlmf7gd3nhrlcbycplqrc4jpe
Wavelet Based Multifractal Formalism: Applications to DNA Sequences, Satellite Images of the Cloud Structure, and Stock Market Data
[chapter]
2002
The Science of Disasters
Preserved Fulltext
A copy of this work was available on the public web and has been preserved in the Wayback Machine. The capture dates from 2015; you can also visit the original URL.
The file type is application/pdf.
Ciliberto for the permission to use their experimental data. ...
The other fundamental advantage of using wavelets is that the skeleton defined by the wavelet transform modulus maxima [40, 41] provides an adaptative space-scale partition of the fractal distribution ...
As originally proposed by Mallat and collaborators [40, 41] , a very efficient way to perform point-wise regularity analysis is to use the wavelet transform modulus maxima (WTMM). ...
doi:10.1007/978-3-642-56257-0_2
fatcat:cfufd4eu7rc3vdi73kju3e3qvu
Dating a tropical ice core by time–frequency analysis of ion concentration depth profiles
2014
Climate of the Past
Preserved Fulltext
A copy of this work was available on the public web and has been preserved in the Wayback Machine. The capture dates from 2017; you can also visit the original URL.
The file type is application/pdf.
We used ion concentration depth profiles collected along a 100 m deep ice core. The results of Fourier time–frequency and wavelet transforms were first compared. ...
Fourier time–frequency analysis was applied to concentration depth profiles of seven other ions, providing information on the suitability of each of them for the dating of tropical Andean ice cores. ...
A similar approach was then taken using wavelet transforms. ...
doi:10.5194/cp-10-1659-2014
fatcat:wvb6tq5qxnfe5ciu6ojod4srcm
Polyphony of Short-Term Climatic Variations
2021
Atmosphere
Preserved Fulltext
A copy of this work was available on the public web and has been preserved in the Wayback Machine. The capture dates from 2022; you can also visit the original URL.
The file type is application/pdf.
Using a wavelet analysis on the example of the time series of the global mean near-surface air temperature created at the American National Climate Data Center (NCDC), some complex structures of inter-annual ...
Each of these external forces is individually known to climatologists. ...
Conflicts of Interest: The authors declare no conflict of interest. Atmosphere 2021, 12, 1145 ...
doi:10.3390/atmos12091145
doaj:b591daf59de44e5a8a8506c9172f688b
fatcat:z2rwqecoibc53cxwwwudxetwfm
Inversion of shallow-seismic wavefields: II. Inferring subsurface properties from wavefield transforms
2003
Geophysical Journal International
Preserved Fulltext
A copy of this work was available on the public web and has been preserved in the Wayback Machine. The capture dates from 2017; you can also visit the original URL.
The file type is application/pdf.
Owing to the multi-mode character of shallow-seismic field-data conventional techniques of dispersion analysis are not applicable. ...
The wavefield transformation removes a remarkable amount of non-linearity from the data. In consequence the proposed method is robust even in the absence of a priori information. ...
transformation used in eq. 1). ...
doi:10.1046/j.1365-246x.2003.01985.x
fatcat:bdocr5tooregxfg5xrsgcf2mse
Bayesian full-waveform inversion of tube waves to estimate fracture aperture and compliance
2020
Solid Earth
Preserved Fulltext
A copy of this work was available on the public web and has been preserved in the Wayback Machine. The capture dates from 2020; you can also visit the original URL.
The file type is application/pdf.
The hydraulic and mechanical characterization of fractures is crucial for a wide range of pertinent applications, such as geothermal energy production, hydrocarbon exploration, CO2 sequestration, and nuclear ...
While the results are consistent with the corresponding evidence from televiewer data and exemplarily illustrate the advantages of using a computationally expensive stochastic, instead of a deterministic ...
This work has been completed within the Swiss Competence Center on Energy Research -Supply of Electricity, with support of Innosuisse and the Swiss National Science Foundation in the framework of the National ...
doi:10.5194/se-11-657-2020
fatcat:65o4sietdbacfpo425ua5zqahu
Image registration methods: a survey
2003
Image and Vision Computing
Preserved Fulltext
A copy of this work was available on the public web and has been preserved in the Wayback Machine. The capture dates from 2013; you can also visit the original URL.
The file type is application/pdf.
function design, and image transformation and resampling. ...
Image registration is the process of overlaying images (two or more) of the same scene taken at different times, from different viewpoints, and/or by different sensors. ...
Acknowledgements This work has been supported by the grant No. 102/01/P065 of the Grant Agency of the Czech Republic. ...
doi:10.1016/s0262-8856(03)00137-9
fatcat:32sicyshtfaktnbjnacvjcway4
Photometric variability of the T Tauri star TW Hya on time-scales of hours to years★
2008
Monthly notices of the Royal Astronomical Society
Preserved Fulltext
A copy of this work was available on the public web and has been preserved in the Wayback Machine. The capture dates from 2018; you can also visit the original URL.
The file type is application/pdf.
Other Versions
MOST (Microvariability & Oscillations of STars) and ASAS (All Sky Automated Survey) observations have been used to characterize photometric variability of TW Hya on time scales from a fraction of a day ...
Instead, a spectrum of unstable single periods within the range of 2 - 9 days was observed; the tendency of the periods to progressively shorten was well traced using the wavelet analysis. ...
This research has made use of the SIMBAD data base, operated at CDS, Strasbourg, France and NASA's Astrophysics Data System (ADS) Bibliographic Services. ...
doi:10.1111/j.1365-2966.2008.14014.x
fatcat:gmirbmhf25h5jdbbhfjskyq3vu
« Previous
Showing results 1 — 15 out of 223 results