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Journal Article

Deep-unrolling architecture for image-domain least-squares migration

Wei Zhang, Matteo Ravasi, Jinghuai Gao, Ying Shi
Journal: Geophysics
Published: 22 March 2024
Geophysics (2024) 89 (3): S215–S234.
DOI: https://doi.org/10.1190/geo2023-0428.1
... apply an unrolled version of the gradient descent (GD) algorithm as our DIP network architecture, denoted as the deep-unrolling (DU) architecture. Each layer of the unrolled network is comprised of two parts: the first part corresponds to the GD step of the data-fidelity term, whereas the second part...
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( a ) Integrated XRD patterns before and after heating of 17TiPv and ( b ) ...

( a ) Integrated XRD patterns before and after heating of 17TiPv and ( b ) ...

Published: 01 November 2024
Figure 1. ( a ) Integrated XRD patterns before and after heating of 17TiPv and ( b ) unrolled projections of the 2D raw diffraction areas near splitting (004) and (220) peaks of 17TiPv. ( c ) Integrated XRD patterns before and after heating of 25TiPv and ( d ) unrolled projections of the 2D raw
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(a) <span class="search-highlight">Unrolled</span> patterns of deformed intersection lineations ( F 1 ) occurrin...

(a) Unrolled patterns of deformed intersection lineations ( F 1 ) occurrin...

Published: 22 March 2021
Fig. 13. (a) Unrolled patterns of deformed intersection lineations ( F 1 ) occurring in F 2 folds in the Nimbahera Shale beds. (b) Rosette obtained by scaling and overlapping mid-points of 49 unrolled F 1 lineation patterns. ENE–WSW-directed rectilinear patterns are predominant.
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Stereographic data from the area shown on Fig. 3. Abbreviations as in the ...

Stereographic data from the area shown on Fig. 3. Abbreviations as in the ...

Published: 01 March 2000
Fig. 7. Stereographic data from the area shown on Fig. 3. Abbreviations as in the text and on Figs 2 and 3. Light arrows on (f) and (g) indicate inferred movement of S1/S2 maxima during unrolling of the HBD. The changing orientation of D1 and D2 data from Zone A of the HBSB to the Flat Belt
Journal Article

Morphology and structure of endellite and halloysite

Thomas F. Bates, Fred A. Hildebrand, Ada Swineford
Published: 01 August 1950
American Mineralogist (1950) 35 (7-8): 463–484.
...Thomas F. Bates; Fred A. Hildebrand; Ada Swineford Abstract An electron microscope study of the minerals of the kaolinite group has revealed that halloysite (metahalloysite) crystals consist of hollow tubes which have commonly collapsed, or have split and partially or completely unrolled...
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<span class="search-highlight">Unrolled</span> diagram of the implemented iterative learned network for the first...

Unrolled diagram of the implemented iterative learned network for the first...

Published: 22 September 2022
Figure 1. Unrolled diagram of the implemented iterative learned network for the first two iterations.
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Borehole image: from the cylinder to an <span class="search-highlight">unrolled</span> image. On the right, a typ...

Borehole image: from the cylinder to an unrolled image. On the right, a typ...

Published: 12 July 2021
Figure 1. Borehole image: from the cylinder to an unrolled image. On the right, a typical color map used by geologists is applied on the grayscale image. We can clearly see a fault crossing the middle of the image (the sinusoid with high amplitude), surrounded by many sinusoids with very small
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A diagram of (a) the RNN and (b) its <span class="search-highlight">unrolled</span> version.

A diagram of (a) the RNN and (b) its unrolled version.

Published: 21 October 2020
Figure 1. A diagram of (a) the RNN and (b) its unrolled version.
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An “<span class="search-highlight">unrolled</span>” representation of the Swartberg deposit. Note the thickening ...

An “unrolled” representation of the Swartberg deposit. Note the thickening ...

Published: 01 August 2020
Fig. 19. An “unrolled” representation of the Swartberg deposit. Note the thickening of the Garnet Quartzite, the shallow depressions in which the pelitic lenses of the Lower Orebody were deposited, and the location of the Dark Quartzite in the up-slope equivalent location of the Lower Orebody
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The <span class="search-highlight">unrolled</span> directed acyclic graph of the waveform RNN.

The unrolled directed acyclic graph of the waveform RNN.

Published: 09 January 2020
Figure 2. The unrolled directed acyclic graph of the waveform RNN.
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The <span class="search-highlight">unrolled</span> directed acyclic graph of the RNN for the inverse problem.

The unrolled directed acyclic graph of the RNN for the inverse problem.

Published: 09 January 2020
Figure 4. The unrolled directed acyclic graph of the RNN for the inverse problem.
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Lienetz open-pit profile geologic map. (A) <span class="search-highlight">Unrolled</span> profile of the Lienetz ...

Lienetz open-pit profile geologic map. (A) Unrolled profile of the Lienetz ...

Published: 01 January 2018
Fig. 12. Lienetz open-pit profile geologic map. (A) Unrolled profile of the Lienetz open pit with draped geologic features. Rock types, compiled from bench mapping and supplemented by spatially referenced photos. Yellow stars are fixed orientation points. White dashes are boundaries domains ( Fig
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<span class="search-highlight">Unrolled</span> 360° scanned drill core images of basement granitoids from Koyna r...

Unrolled 360° scanned drill core images of basement granitoids from Koyna r...

Published: 01 December 2017
Fig. 2. Unrolled 360° scanned drill core images of basement granitoids from Koyna region. Red arrows point to increasing depth.
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<span class="search-highlight">Unrolled</span> diffraction images of: (a) Death Valley DV1; (b) Salton sea mud vo...

Unrolled diffraction images of: (a) Death Valley DV1; (b) Salton sea mud vo...

Published: 01 November 2017
Figure 5. Unrolled diffraction images of: (a) Death Valley DV1; (b) Salton sea mud volcano SS2; and (c) Val Albigna glacial lake Brg1644 samples displaying intensity (gray shade) as a function of scattering vector magnitude q = 2π/ d and azimuthal angle in diffraction image (corresponding
Journal Article

Noise attenuation in distributed acoustic sensing data using a guided unsupervised deep learning network

Omar M. Saad, Matteo Ravasi, Tariq Alkhalifah
Journal: Geophysics
Published: 14 October 2024
Geophysics (2024) 89 (6): V573–V587.
DOI: https://doi.org/10.1190/geo2024-0109.1
... transform (CWT) is performed, and the finest scale is used to guide the DL model in reconstructing the DAS signal. First, we extract 2D patches from the band-pass filtered data and the CWT scale of the data. Then, these patches are converted using an unrolling mechanism into 1D vectors to form the input...
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<span class="search-highlight">Unrolled</span> 180° scans (5 cm scale bars) or flat scanned images (2.5 cm scale ...

Unrolled 180° scans (5 cm scale bars) or flat scanned images (2.5 cm scale ...

Published: 01 April 2015
Figure 3. Unrolled 180° scans (5 cm scale bars) or flat scanned images (2.5 cm scale bars) of core sections typical of the various lithological units. Comprehensive descriptions of each unit are provided in Table 1 . Notable features within these scans include (A) steep trains of feldspar augen
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<span class="search-highlight">Unrolled</span> 180° scans (5 cm scale bars) or flat scans (2.5 cm scale bars) of ...

Unrolled 180° scans (5 cm scale bars) or flat scans (2.5 cm scale bars) of ...

Published: 01 April 2015
Figure A2. Unrolled 180° scans (5 cm scale bars) or flat scans (2.5 cm scale bars) of core sections illustrating typical structures in each of the lithological units. The various structures observed in each image are indicated in Table A1 . Throughout, yellow arrows highlight microfaults. In Q
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Photo and <span class="search-highlight">unrolled</span> whole-core scan image of the outer surface of the AND-1B...

Photo and unrolled whole-core scan image of the outer surface of the AND-1B...

Published: 01 October 2014
Figure 5. Photo and unrolled whole-core scan image of the outer surface of the AND-1B core showing examples of extension veins that contain mechanically twinned calcite sampled and analyzed as part of this study. Sample numbers in lower left. (A) Steeply dipping, folded extension veins. Scale
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Schematic of the <span class="search-highlight">unrolled</span> R p computation for F ′ f...

Schematic of the unrolled R p computation for F ′ f...

Published: 24 May 2013
Figure 3. Schematic of the unrolled R p computation for F ′ frequencies. Each box represents an independent thread for a specific integrand angle (on real and imaginary axes) and frequency.
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A comparison of (a) ‘<span class="search-highlight">unrolled</span>’ diffraction spectra of sample S4 between the...

A comparison of (a) ‘unrolled’ diffraction spectra of sample S4 between the...

Published: 01 June 2012
Figure 4 A comparison of (a) ‘unrolled’ diffraction spectra of sample S4 between the calculated model (upper) and the experimental data (lower) and (b) diffraction peaks in the spectrum which display eight constituent minerals. The variation in intensity along the azimuth are clearly displayed