Ergonomics in 3‐D depth migration

Wyatt, Kay Dautenhahn; Towe, Susan K.; Layton, Jesse; Wyatt, S.; Seggern, D. H. von; Brockmeier, Christopher

doi:10.1190/1.1822262

Cited by 9 publications

(7 citation statements)

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“…Recently, several studies have described its use as a sustained-release carrier for both conventional and peptide drugs. [10][11][12][13][14][15][16][17][18][19][20][21][22][23] At 37°C and upon addition of increasing amounts of water, monoolein and monolinolein swell and form cubic phases via reversed micellar (L 2 ) and lamellar phases. 24 The cubic phase is isotropic and consists of two congruent networks of water channels surrounded by curved bilayers extending in three dimensions.…”

Section: Introductionmentioning

confidence: 99%

Swelling of and Drug Release from Monoglyceride-Based Drug Delivery Systems

Chang

Bodmeier

1997

Journal of Pharmaceutical Sciences

110

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Depending on the water content, unsaturated monoglycerides form various liquid crystalline phases, which can be used as sustained-release carriers. The aim of this study was to investigate the water uptake of and drug release from melt-congealed monoglyceride-based drug carriers. The water uptake of the unsaturated monoglycerides monoolein and monolinolein followed second-order swelling kinetics and levelled off at about 50% water content, at which a highly viscous cubic phase was formed. The rapid formation of the cubic phase suggested that the drug release occurred mainly from this phase. The drug release followed the square-root of time relationship during the initial release phase. Chlorpheniramine maleate, an amphiphilic drug was not completely released because of binding to the cubic phase. The rate of water uptake increased and the maximum water uptake decreased with increasing temperature. The drug release could be controlled by varying the surface-to-volume ratio, the drug loading, and the water content of the lipid matrix. It was independent of the source of monoolein.

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Section: Introductionmentioning

confidence: 99%

Swelling of and Drug Release from Monoglyceride-Based Drug Delivery Systems

Chang

Bodmeier

1997

Journal of Pharmaceutical Sciences

110

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“…Such modifications may be used for time-to-depth conversion in geophysical processing [10,34,6] or for generating several equiprobable geometric realizations that honor the data [14]. In this work, we have tackled more specifically the demanding aspects of interactive expert editing.…”

Section: Volume Modeling In Geosciencesmentioning

confidence: 99%

Constrained modifications of non-manifold B-reps

Caumon¹,

Sword

Mallet³

2003

Proceedings of the Eighth ACM Symposium on Solid Modeling and Applications

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Non-manifold boundary representations (b-reps) are increasingly used in Geosciences for a variety of applications (3D geographical information systems, basin modeling, geophysical processing, etc.). Meanwhile, the uncertainties associated with subsurface data make it desirable to modify such models efficiently. We present a method to deform locally a surface in a triangulated b-rep while maintaining a constant number of spatial regions in the model. This method does not require completely rebuilding the model, and thus allows efficient and robust updates of the model definition. The method requires that the reshaped surface does not intersect the boundaries of its adjoining regions, which can be checked using existing collision detection algorithms. Also, the non-manifold contacts must be updated after the modification, and the triangles must be altered, to maintain sealed regions. For this, we propose to parameterize locally the surfaces that the modified surface moves along. This parametric space is used to 1) constrain the displacement of the deformed surface border and, 2) re-triangulate in the plane the neighboring surfaces around the modified contacts. The method, tested in the context of an interactive graphical manipulator, is very efficient and independent from the deformation mechanism.

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“…Here we elaborate on the methodology previously demonstrated and discussed by several authors (Cabrera et al, 1992;Johnson, 1992;Ratcliff, et al, 1992;Rockliff, et al, 1992;Wyatt, 1992): these approaches take their initial velocity field from interval veloeities derived from RMS stacking velocities, with appropriate phases of smoothing and tying to wells.…”

Section: Introductionmentioning

confidence: 99%

“…Cost constrain ts have to date limited the scope for fuIly flexible iterative migration: Wyatt et al (1992) for example used only two passes of depth migration, nevertheless obtaining excellent results having only had one pass at model updating on the basis of the first depth migration, Here we use a technique keeping CPU times to below a few hours thus permitting perturbation of the velocity field to investigate lateral variations within layers while velocity 'flooding' below key horizons permits accurate 3D picking of subsequent horizons in depth migrated space. EssentiaIly, we selectively decimate parameters for depth migration so as to mini mise run-times whilst maintaining the integrity of the resultant image.…”

Section: Introductionmentioning

confidence: 99%

Iterative 3D Depth Model Building via One-Pass 3D Depth Migration

Jones¹

1994

EAEG/SEG Summer Workshop - Construction of 3-D Macro Velocity-Depth Models

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With the advent of steep-dip non-dispersive Isotropie 3D time and depth migration algorithms, the ability to image complex structures has entered a riew phase. However, the most important issue in subsurface imaging is nor the migration algorithm, but the elaboration of the subsurface velocity model. Many conventional approaches to obtaining a migration velocity field involve Dix inversion of RMS stacking veloeities. with appropriate editing and smoothing, leading to image ray, or normal ray map migration of picked time horizons to produce a final depth model.

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Ergonomics in 3‐D depth migration

Cited by 9 publications

References 0 publications

Swelling of and Drug Release from Monoglyceride-Based Drug Delivery Systems

Swelling of and Drug Release from Monoglyceride-Based Drug Delivery Systems

Constrained modifications of non-manifold B-reps

Iterative 3D Depth Model Building via One-Pass 3D Depth Migration

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