Zobrazeno 1 - 10
of 27
pro vyhledávání: '"Oleg Portniaguine"'
Autor:
Satinder Chopra, Ritesh Kumar Sharma, John Castagna, Oleg Portniaguine, Gabriel Gil, Kenneth Bredesen
Publikováno v:
First Break. 40:35-41
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::5f9d625682f5be12e6114316d55f0d97
https://doi.org/10.3997/1365-2397.fb2022044
https://doi.org/10.3997/1365-2397.fb2022044
Publikováno v:
Interpretation. 4:SN1-SN10
Any seismic trace can be decomposed into a 2D function of amplitude versus time and phase. We call this process phase decomposition, and the amplitude variation with time for a specific seismic phase is referred to as a phase component. For seismical
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::1ff0633dcbf0ee481127c5dabf9f10ba
https://doi.org/10.1190/int-2015-0150.1
https://doi.org/10.1190/int-2015-0150.1
Publikováno v:
SEG Technical Program Expanded Abstracts 2017.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::2f81da3031def2d2ea48b39428b4ecf4
https://doi.org/10.1190/segam2017-17737608.1
https://doi.org/10.1190/segam2017-17737608.1
Autor:
Oleg Portniaguine, Michael S. Zhdanov
Publikováno v:
GEOPHYSICS. 67:1532-1541
We develop a method of 3‐D magnetic anomaly inversion based on traditional Tikhonov regularization theory. We use a minimum support stabilizing functional to generate a sharp, focused inverse image. An iterative inversion process is constructed in
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::106d8222a87575a530b61df82f2d8963
https://doi.org/10.1190/1.1512749
https://doi.org/10.1190/1.1512749
Autor:
Oleg Portniaguine, Michael S. Zhdanov
Publikováno v:
GEOPHYSICS. 64:874-887
A critical problem in inversion of geophysical data is developing a stable inverse problem solution that can simultaneously resolve complicated geological structures. The traditional way to obtain a stable solution is based on maximum smoothness crit
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::582648350af4426d2fe057e149e7205f
https://doi.org/10.1190/1.1444596
https://doi.org/10.1190/1.1444596
Autor:
Oleg Portniaguine, Michael S. Zhdanov
Publikováno v:
Geophysical Journal International. 131:293-309
SUMMARY Time-domain electromagnetic (TDEM) migration is based on downward extrapolation of the observed field in reverse time. In fact, the migrated EM field is the solution of the boundary-value problem for the adjoint Maxwell’s equations. The imp
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::0232b92204504512ca8ef49e6e9df810
https://doi.org/10.1111/j.1365-246x.1997.tb01223.x
https://doi.org/10.1111/j.1365-246x.1997.tb01223.x
Publikováno v:
Exploration Geophysics. 26:186-194
One of the most challenging problems of electrical geophysical methods is the interpretation of time domain electromagnetic (TDEM) sounding data in the areas with the horizontally inhomogeneous geo...
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e96f9a0bb009a5b6ce30e27ff5985e34
https://doi.org/10.1071/eg995186
https://doi.org/10.1071/eg995186
Publikováno v:
SEG Technical Program Expanded Abstracts 2012.
An inversion-based algorithm for computing the time-frequency analysis of reflection seismograms using constrained least-squares spectral analysis is formulated and applied to modeled seismic waveforms and real seismic data. The Fourier series coeffi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5975d67c387a679024341f1971516ea5
https://doi.org/10.1190/segam2012-0822.1
https://doi.org/10.1190/segam2012-0822.1
Autor:
John P. Castagna, Oleg Portniaguine, Don Griffiths, Carlos Moreno, Fa Dwan, Mike Burnett, Carlos Mastrangelo, Jose Gil
Publikováno v:
All Days.
Abstract Conventional seismic inversion operates in the time domain and outputs relative impedances. Spectral inversion (Portniaguine and Castagna, 2005; Partyka, 2005) operates in the frequency domain where the spectrum of a local seismic response i
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::6b6bac4bfec8b0ff3f607db9041c005f
https://doi.org/10.4043/18951-ms
https://doi.org/10.4043/18951-ms
In this paper, we present a novel approach to imaging sparse and focal neural current sources from MEG (magnetoencephalography) data. Using the framework of Tikhonov regularization theory, we introduce a new stabilizer that uses the concept of contro
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f29c06a3d13f48281d1e7982e86a67f9
https://europepmc.org/articles/PMC4057891/
https://europepmc.org/articles/PMC4057891/
