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Articles de revues sur le sujet « Velocity and Density 3D models »

Auteur : Grafiati
Publié le 10 mars 2023

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1

Guo, Peng, and George A. McMechan. "Sensitivity of 3D 3C synthetic seismograms to anisotropic attenuation and velocity in reservoir models." GEOPHYSICS 82, no. 2 (2017): T79—T95. http://dx.doi.org/10.1190/geo2016-0321.1.

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Anisotropic attenuation in fluid-saturated reservoirs with high fracture density may be diagnostic for reservoir characterization. Wave-induced mesoscale fluid flow is considered to be the major cause of intrinsic attenuation at exploration seismic frequencies. We perform tests of the sensitivity, of anisotropic attenuation and velocity, to reservoir properties in fractured HTI media based on the mesoscale fluid flow attenuation mechanism. The viscoelastic T-matrix, a unified effective medium theory of global and local fluid flow mechanisms, is used to compute frequency-dependent anisotropic a
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Huang, Long, Robert R. Stewart, Nikolay Dyaur, and Jose Baez-Franceschi. "3D-printed rock models: Elastic properties and the effects of penny-shaped inclusions with fluid substitution." GEOPHYSICS 81, no. 6 (2016): D669—D677. http://dx.doi.org/10.1190/geo2015-0655.1.

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3D printing techniques (additive manufacturing) using different materials and structures provide opportunities to understand porous or fractured materials and fluid effects on their elastic properties. We used a 3D printer (Stratasys Dimension SST 768) to print one “solid” cube model and another with penny-shaped inclusions. The 3D printing process builds materials, layer by layer, producing a slight “bedding” plane, somewhat similar to a sedimentary process. We used ultrasonic transducers (500 kHz) to measure the P- and S-wave velocities. The input printing material was thermoplastic with a d
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3

Ishikawa, Mayra, Wendy Gonzalez, Orides Golyjeswski, et al. "Effects of dimensionality on the performance of hydrodynamic models for stratified lakes and reservoirs." Geoscientific Model Development 15, no. 5 (2022): 2197–220. http://dx.doi.org/10.5194/gmd-15-2197-2022.

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Abstract. Numerical models are an important tool for simulating temperature, hydrodynamics, and water quality in lakes and reservoirs. Existing models differ in dimensionality by considering spatial variations of simulated parameters (e.g., flow velocity and water temperature) in one (1D), two (2D) or three (3D) spatial dimensions. The different approaches are based on different levels of simplification in the description of hydrodynamic processes and result in different demands on computational power. The aim of this study is to compare three models with different dimensionalities and to anal
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Kurapati, Sushma, Jayaram N. Chengalur, Peter Kamphuis, and Simon Pustilnik. "Mass models of gas-rich void dwarf galaxies." Monthly Notices of the Royal Astronomical Society 491, no. 4 (2019): 4993–5014. http://dx.doi.org/10.1093/mnras/stz3334.

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ABSTRACT We construct mass models of eight gas rich dwarf galaxies that lie in the Lynx–Cancer void. From NFW fits to the dark matter halo profile, we find that the concentration parameters of haloes of void dwarf galaxies are similar to those of dwarf galaxies in normal density regions. We also measure the slope of the central dark matter density profiles, obtained by converting the rotation curves derived using 3D (fat) and 2D (ROTCUR) tilted ring fitting routines, into mass densities. We find that the average slope (α = −1.39 ± 0.19), obtained from 3D fitting is consistent with that expecte
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KARTOON, D., D. ORON, L. ARAZI, and D. SHVARTS. "Three-dimensional multimode Rayleigh–Taylor and Richtmyer–Meshkov instabilities at all density ratios." Laser and Particle Beams 21, no. 3 (2003): 327–34. http://dx.doi.org/10.1017/s0263034603213069.

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The three-dimensional (3D) turbulent mixing zone (TMZ) evolution under Rayleigh–Taylor and Richtmyer–Meshkov conditions was studied using two approaches. First, an extensive numerical study was made, investigating the growth of a random 3D perturbation in a wide range of density ratios. Following that, a new 3D statistical model was developed, similar to the previously developed two-dimensional (2D) statistical model, assuming binary interactions between bubbles that are growing at a 3D asymptotic velocity. Confirmation of the theoretical model was gained by detailed comparison of the bubble s
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Sharov, N. V., L. I. Bakunovich, B. Z. Belashev, and M. Y. Nilov. "Velocity structure and density inhomogeneities of the White Sea crust." Arctic: Ecology and Economy, no. 4(40) (December 2020): 43–53. http://dx.doi.org/10.25283/2223-4594-2020-4-43-53.

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The study area is the White Sea basin and adjacent territories. The relevance of the work carried out here is determined by active geodynamics, kimberlite magmatism, and prospects for the hydrocarbon search. The authors set the goal to model the velocity structure of the region’s crust using data from instrumental observations and the Integro software package. A comprehensive interpretation of gravimetric, magnetometric, seismic, petrophysical and geological data has been carried out. With the help of 2D models based on the DSZ profiles and digital maps of geophysical fields, refined density s
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Sukhinov, A., A. Chistyakov, S. Protsenko, and E. Protsenko. "Study of 3D discrete hydrodynamics models using cell filling." E3S Web of Conferences 224 (2020): 02016. http://dx.doi.org/10.1051/e3sconf/202022402016.

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Modern methods and tools for coastal hydrodynamics modeling indicate the necessity of constructing discrete analogs of models for ones the properties: balance and conservation laws (for mass, flows, impulse), stability, convergence and etc. have been fulfilled. The paper considers a continuous three-dimensional mathematical model of the hydrodynamics of water basins and its discretization. The pressure correction method at variable water medium density was used to solve the problem of hydrodynamics. The considered discrete mathematical models of hydrodynamics take into account the filling of c
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Qiu, Ruofan, Rongqian Chen, Chenxiang Zhu, and Yancheng You. "A Hermite-based lattice Boltzmann model with artificial viscosity for compressible viscous flows." International Journal of Modern Physics B 32, no. 13 (2018): 1850157. http://dx.doi.org/10.1142/s0217979218501576.

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A lattice Boltzmann model on Hermite basis for compressible viscous flows is presented in this paper. The model is developed in the framework of double-distribution-function approach, which has adjustable specific-heat ratio and Prandtl number. It contains a density distribution function for the flow field and a total energy distribution function for the temperature field. The equilibrium distribution function is determined by Hermite expansion, and the D3Q27 and D3Q39 three-dimensional (3D) discrete velocity models are used, in which the discrete velocity model can be replaced easily. Moreove
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9

Moens, Nicolas, and Levin Hennicker. "The first 3D models of evolved hot star outflows." Proceedings of the International Astronomical Union 16, S366 (2020): 15–20. http://dx.doi.org/10.1017/s1743921322000230.

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AbstractThe mechanisms driving mass loss from massive stars in late stages of their evolution is still very much unknown. Stellar evolution models indicate that the last stage before going supernova for many massive stars is the Wolf-Rayet (WR) phase, characterized by a strong, optically thick stellar wind. Stellar models show that these stars exceed the Eddington limit already in deep sub-surface layers around the so-called ‘iron-opacity’ bump, and so should launch a supersonic outflow from there. However, if the outward force does not suffice to accelerate the gas above the local escape spee
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Zhang, Jian, Chi‐Yuen Wang, Yaolin Shi, et al. "Three‐dimensional crustal structure in central Taiwan from gravity inversion with a parallel genetic algorithm." GEOPHYSICS 69, no. 4 (2004): 917–24. http://dx.doi.org/10.1190/1.1778235.

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The genetic algorithm method is combined with the finite‐element method for the first time as an alternative method to invert gravity anomaly data for reconstructing the 3D density structure in the subsurface. The method provides a global search in the model space for all acceptable models. The computational efficiency is significantly improved by storing the coefficient matrix and using it in all forward calculations, then by dividing the region of interest into many subregions and applying parallel processing to the subregions. Central Taiwan, a geologically complex region, is used as an exa
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Maes, S., W. Homan, J. Malfait, et al. "SPH modelling of companion-perturbed AGB outflows including a new morphology classification scheme." Astronomy & Astrophysics 653 (September 2021): A25. http://dx.doi.org/10.1051/0004-6361/202140823.

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Context. Asymptotic giant branch (AGB) stars are known to lose a significant amount of mass by a stellar wind, which controls the remainder of their stellar lifetime. High angular-resolution observations show that the winds of these cool stars typically exhibit mid- to small-scale density perturbations such as spirals and arcs, believed to be caused by the gravitational interaction with a (sub-)stellar companion. Aims. We aim to explore the effects of the wind-companion interaction on the 3D density and velocity distribution of the wind, as a function of three key parameters: wind velocity, bi
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Sachin, P. V., Asha Sathish, and T. S. Boopathi. "The performance of flow field channel in direct methanol fuel cell." Journal of Physics: Conference Series 2070, no. 1 (2021): 012081. http://dx.doi.org/10.1088/1742-6596/2070/1/012081.

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Abstract A 3D computational fluid dynamics (CFD) model is developed to examine the impact of flow field design on the performance of direct methanol fuel cells (DMFCs). Effect of three various type flow fields is investigated in this study: single, double serpentine and honeycomb models. The distribution of velocity and temperature are simulated in 3D models. According to simulation studies, the honeycomb flow field has made uniform flow velocity distribution and minimum temperature change on plate surface. This could result better on DMFC performance. The experimental studies emphasize the pe
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13

Cristaldi, Domenico Andrea, Azzurra Sargenti, Simone Bonetti, et al. "A Reliable Flow-Based Method for the Accurate Measure of Mass Density, Size and Weight of Live 3D Tumor Spheroids." Micromachines 11, no. 5 (2020): 465. http://dx.doi.org/10.3390/mi11050465.

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Gathering precise information on mass density, size and weight of cells or cell aggregates, is crucial for applications in many biomedical fields with a specific focus on cancer research. Although few technical solutions have been presented for single-cell analysis, literature does not cover this aspect for 3D models such as spheroids. Since the research interest on such samples is notably rising, here we describe a flow-apparatus, and the associated physical method and operative protocol for the accurate measurements of mass density, size and weight. The technique is based on the detection of
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14

Eigenbrot, Arthur D., and Matthew A. Bershady. "Decoding 3D Disk Structure and Dynamics Using Doppler Tomography." Proceedings of the International Astronomical Union 10, S309 (2014): 311. http://dx.doi.org/10.1017/s1743921314010072.

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AbstractWe demonstrate a method to measure both rotation curves and 3D ISM structure in edge-on galaxies. Two-dimensional spectral coverage of edge-on galaxies reveals substantial deviations in emission line shapes from a purely gaussian profile that vary with radius and height. Non-gaussianity is quantified using statistical moments to third order. We infer the 3D density distribution by comparing the measured line profiles to synthetic line-of-sight velocity distributions from a suite of three-dimensional galaxy models with different 3D distributions of dust and gas and different rotation cu
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15

Senior, Jessica, Amanda Dalby, Joao Correia, et al. "MODL-26. EVOLUTION OF MULTI-FACETED GLIOBLASTOMA MICROENVIRONMENTS IN 3D." Neuro-Oncology 24, Supplement_7 (2022): vii296. http://dx.doi.org/10.1093/neuonc/noac209.1153.

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Abstract Glioblastomas (GBM) account for poor prognosis and dismal survival rates in patients due to their highly aggressive infiltrative nature to rapidly migrate within the brain. Experimental treatments for GBMs using animal models often elicit severe side effects and there are major doubts regarding the usefulness of such in vivo models when undergoing animal to human clinical translation. Here, we describe the development of a series of 3D bioengineered GBM models towards the generation of a more physiologically representative system in which candidate drugs can be tested. Glioma cell lin
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16

Khelil, A., S. Nechad, H. Naji, L. Loukarfi, M. Braikia, and M. Beriache. "Numerical Study of the Influence of Combustion Models and Kinetic Schemes When Predicting the Diffusion Flames." Journal of Mechanics 28, no. 4 (2012): 701–13. http://dx.doi.org/10.1017/jmech.2012.108.

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ABSTRACTThis article aims to study numerically three-dimensional (3D) reactive turbulent flow in a combustion chamber of a gas turbine by solving a steady Reynolds-Averaged Navier-Stokes (RANS) )and energy equations. The Reynolds stress model (RSM) is coupled with the probability density function (PDF), laminar flamelet and Chemistry models to describe the turbulent flow and turbulence–chemistry interaction. Numerical computations are conducted to exhibit thermal and concentration behaviour under a quite number of factors, which influence the combustion process. Their influence are examined an
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17

Cao, Ruikun, Stephanie Earp, Sjoerd A. L. de Ridder, Andrew Curtis, and Erica Galetti. "Near-real-time near-surface 3D seismic velocity and uncertainty models by wavefield gradiometry and neural network inversion of ambient seismic noise." GEOPHYSICS 85, no. 1 (2020): KS13—KS27. http://dx.doi.org/10.1190/geo2018-0562.1.

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With the advent of large and dense seismic arrays, novel, cheap, and fast imaging and inversion methods are needed to exploit the information captured by stations in close proximity to each other and produce results in near real time. We have developed a sequence of fast seismic acquisition for dispersion curve extraction and inversion for 3D seismic models, based on wavefield gradiometry, wave equation inversion, and machine-learning technology. The seismic array method that we use is Helmholtz wave equation inversion using measured wavefield gradients, and the dispersion curve inversions are
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18

Wu, Guohong, Xiangyu Duan, Jianghui Zhu, Xiaoqin Li, Xuelin Tang, and Hui Gao. "Investigations of hydraulic transient flows in pressurized pipeline based on 1D traditional and 3D weakly compressible models." Journal of Hydroinformatics 23, no. 2 (2021): 231–48. http://dx.doi.org/10.2166/hydro.2021.134.

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Abstract Transient flow characteristics and dissipation mechanism in pressurized pipeline were investigated based on 1D friction models and 3D turbulence models, where the pressure–density model was combined into the 3D continuity equation allowing for the elasticity of the fluid and the pipes. The applicability of 3D realizable k–ε and 3D SST (shear stress transport) k–ω turbulence models was verified with comparison to 1D traditional water hammer models and the experimental data for fast closing of the valve in the reservoir–pipe–valve system. The valve closure rule was instantaneously carri
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19

Belashev, Boris, Lyubov Bakunovich, Nikolai Sharov, and Michail Nilov. "Seismic Density Model of the White Sea’s Crust." Geosciences 10, no. 12 (2020): 492. http://dx.doi.org/10.3390/geosciences10120492.

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Study of the deep structure of the White Sea region is relevant to active geodynamics, manifestations of kimberlite magmatism, and the prospects of oil and gas searches. The aim of this work was to model the velocity and density structure of the earth’s crust in the White Sea region. Modelling was carried out using the known data of instrumental observations and the software complex “Integro”. With the help of 2D models based on deep seismic sounding (DSS) profiles and a digital map of the anomalous gravity field, the density structures of local areas of the region’s crust were refined. A 3D d
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Li, Ran, Hongyu Li, Shi Shao, et al. "SDSS-IV MaNGA: the inner density slopes of nearby galaxies." Monthly Notices of the Royal Astronomical Society 490, no. 2 (2019): 2124–38. http://dx.doi.org/10.1093/mnras/stz2565.

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ABSTRACT We derive the mass-weighted total density slopes within the effective (half-light) radius, γ′, for more than 2000 nearby galaxies from the SDSS-IV (Sloan Digital Sky Survey IV) MaNGA survey using Jeans-anisotropic-models applied to integral field unit observations. Our galaxies span a wide range of the stellar mass (109 M⊙ < M* < 1012 M⊙) and the velocity dispersion (30 km s−1 < σv < 300 km s−1). We find that for galaxies with velocity dispersion σv > 100 km s−1, the density slope has a mean value 〈γ′〉 = 2.24 and a dispersion σγ = 0.22, almost indepe
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Delplancke, Claire, Joaquín Fontbona, and Jorge Prado. "A scalable online algorithm for passive seismic tomography in underground mines." GEOPHYSICS 85, no. 4 (2020): WA201—WA211. http://dx.doi.org/10.1190/geo2019-0440.1.

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Understanding and monitoring the seismic responses of rock masses to massive mining are crucial for safety and economic viability of ever larger and deeper underground operations. Seismic monitoring can be used to detect stress variations and hazardous instabilities, but its effectiveness requires accurate estimations of the nonhomogeneous propagation velocity of microseismic waves. While predetermined velocity models are not accurate enough and might bias hypocenter localization, using active-source seismic tomography methods to estimate the velocity field provides limited spatial coverage. T
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Stone, Alice Griffeth, Heather T. Johnson, John M. Blondin, et al. "Type Ia Supernova Models: Asymmetric Remnants and Supernova Remnant G1.9+0.3." Astrophysical Journal 923, no. 2 (2021): 233. http://dx.doi.org/10.3847/1538-4357/ac300f.

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Abstract The youngest Galactic supernova remnant, G1.9+0.3, probably the result of a Type Ia supernova, shows surprising anomalies in the distribution of its ejecta in space and velocity. In particular, high-velocity shocked iron is seen in several locations far from the remnant center, in some cases beyond prominent silicon and sulfur emission. These asymmetries strongly suggest a highly asymmetric explosion. We present high-resolution hydrodynamic simulations in two and three dimensions of the evolution from ages of 100 s to hundreds of years of two asymmetric Type Ia models, expanding into
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Biswas, Reetam, Dhananjay Kumar, and Mrinal K. Sen. "Seismic inversion for density using a transdimensional approach." Leading Edge 41, no. 8 (2022): 548–56. http://dx.doi.org/10.1190/tle41080548.1.

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Commercial and low-saturation gas (also called paleoresidual gas [PRG]) show similar strong amplitude signatures on P-wave seismic data. This poses an exploration risk in gas reservoir regions. However, density correlates inversely with gas saturation and can differentiate a zone of full gas saturation from PRG. This can improve the chances of success in terms of predrill prediction of gas saturation. Amplitude-variation-with-offset (AVO) inversion using prestack seismic data is the most commonly used technique that can estimate elastic parameters such as P-wave velocity, S-wave velocity, and
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Yoshida, Takashi, Tomoya Takiwaki, David R. Aguilera-Dena, et al. "A three-dimensional hydrodynamics simulation of oxygen-shell burning in the final evolution of a fast-rotating massive star." Monthly Notices of the Royal Astronomical Society: Letters 506, no. 1 (2021): L20—L25. http://dx.doi.org/10.1093/mnrasl/slab067.

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ABSTRACT We perform for the first time a 3D hydrodynamics simulation of the evolution of the last minutes pre-collapse of the oxygen shell of a fast-rotating massive star. This star has an initial mass of 38 M⊙, a metallicity of ∼1/50 Z⊙, an initial rotational velocity of 600 km s−1, and experiences chemically homogeneous evolution. It has a silicon- and oxygen-rich (Si/O) convective layer at (4.7–17) × 108 cm, where oxygen-shell burning takes place. The power spectrum analysis of the turbulent velocity indicates the dominance of the large-scale mode (ℓ ∼ 3), which has also been seen in non-ro
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Colombo, Daniele, Gary McNeice, Nickolas Raterman, Mike Zinger, Diego Rovetta, and Ernesto Sandoval Curiel. "Exploration beyond seismic: The role of electromagnetics and gravity gradiometry in deep water subsalt plays of the Red Sea." Interpretation 2, no. 3 (2014): SH33—SH53. http://dx.doi.org/10.1190/int-2013-0149.1.

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The Red Sea is characterized by thick salt sequences representing a seal for potential hydrocarbon accumulations within Tertiary formations deposited over deep basement structures. The Red Sea “salt” is characterized by halite concentrations embedded in layered evaporite sequences composed of evaporite and clastic lithologies. Salt complicates seismic exploration efforts in the Red Sea by generating vertical and lateral velocity variations that are difficult to estimate by seismic methods alone. In these conditions, the exploration challenges of independently imaging the subsalt section and pr
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Lücke, Oscar H., Hans-Jürgen Götze, and Guillermo E. Alvarado. "A Constrained 3D Density Model of the Upper Crust from Gravity Data Interpretation for Central Costa Rica." International Journal of Geophysics 2010 (2010): 1–9. http://dx.doi.org/10.1155/2010/860902.

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The map of complete Bouguer anomaly of Costa Rica shows an elongated NW-SE trending gravity low in the central region. This gravity low coincides with the geographical region known as the Cordillera Volcánica Central. It is built by geologic and morpho-tectonic units which consist of Quaternary volcanic edifices. For quantitative interpretation of the sources of the anomaly and the characterization of fluid pathways and reservoirs of arc magmatism, a constrained 3D density model of the upper crust was designed by means of forward modeling. The density model is constrained by simplified surface
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Yan, Xiang-hui, Li-jun Wang, Ming-ling Wang, and Jia-ling Shi. "Analysis of pressure distribution during movement for the top part of female socks." Textile Research Journal 90, no. 11-12 (2019): 1301–10. http://dx.doi.org/10.1177/0040517519888826.

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Female sports socks were studied to achieve the correlation between the ankle surface curvature and pressure distribution of the top part of socks. The transverse tension performance of the socks’ top part was obtained using an Instron universal strength tester, and the leg size was measured with a [TC]2 contactless 3D body scanner. The pressure was monitored by a Pliance-X-32 pressure test system. Gray correlation, variance, and regression analysis were applied to study the correlation between movement velocity, fabric performance, leg circumference, and ankle pressure distribution. The dynam
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Rauch-Davies, Marianne, David Langton, Michael Bradshaw, et al. "Can fracture orientation and intensity be detected from seismic data? Woodford Formation, Anadarko Basin, Oklahoma investigation." Leading Edge 38, no. 2 (2019): 144–50. http://dx.doi.org/10.1190/tle38020144.1.

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With readily available wide-azimuth, onshore, 3D seismic data, the search for attributes utilizing the azimuthal information is ongoing. Theoretically, in the presence of ordered fracturing, the seismic wavefront shape changes from spherical to nonspherical with the propagation velocity being faster parallel to the fracturing and slower perpendicular to the fracture direction. This concept has been adopted and is used to map fracture direction and density within unconventional reservoirs. More specifically, azimuthal variations in normal moveout velocity or migration velocity are often used to
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Liu, Yuzhu, Xinquan Huang, Jizhong Yang, et al. "Multiparameter model building for the Qiuyue structure using 4C ocean-bottom seismometer data." GEOPHYSICS 86, no. 5 (2021): B291—B301. http://dx.doi.org/10.1190/geo2020-0537.1.

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Thin sand-mud-coal interbedded layers and multiples caused by shallow water pose great challenges to conventional 3D multichannel seismic techniques used to detect the deeply buried reservoirs in the Qiuyue field. In 2017, a dense ocean-bottom-seismometer (OBS) acquisition program acquired a 4C data set in the East China Sea. To delineate the deep reservoir structures in the Qiuyue field, we have applied a full-waveform inversion (FWI) workflow to this dense 4C OBS data set. After preprocessing, including receiver geometry correction, moveout correction, component rotation, and energy transfor
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Gerhard, Ortwin. "Dynamics of the Milky Way Bar/Bulge." Proceedings of the International Astronomical Union 14, S353 (2019): 26–28. http://dx.doi.org/10.1017/s1743921319008809.

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AbstractStellar surveys and dynamical models have recently led to important progress on understanding the dynamical structure of the Milky Way’s bar and central box/peanut bulge. This talk briefly reviews the density structure of the bulge and bar from star count tomography, the cylindrical rotation of bulge stars, and the measurements of their stellar masses and pattern speed that have been obtained by fitting dynamical models to the combined star count and line-of-sight velocity data. Recent work deriving absolute proper motions throughout the bulge from the VIRAC survey and Gaia has led to
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Eswaramoorthi, S., S. Divya, Muhammad Faisal, and Ngawang Namgyel. "Entropy and Heat Transfer Analysis for MHD Flow of C u / A g -Water-Based Nanofluid on a Heated 3D Plate with Nonlinear Radiation." Mathematical Problems in Engineering 2022 (February 18, 2022): 1–14. http://dx.doi.org/10.1155/2022/7319988.

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This paper scrutinizes the consequences of radiation and heat consumption of MHD convective flow of nanofluid on a heated stretchy plate with injection/suction and convective heating/cooling conditions. The nanofluid encompasses with C u and A g nanoparticles. We enforce the suited transformation to remodel the governing mathematical models to ODE models. The HAM (homotopy analysis method) idea is applied to derive the series solutions. The divergence of fluid velocity, temperature, skin friction coefficient, local Nusselt number, entropy generation, and Bejan number on disparate governing par
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Schullian, O., H. S. Antila, and B. R. Heazlewood. "A variable time step self-consistent mean field DSMC model for three-dimensional environments." Journal of Chemical Physics 156, no. 12 (2022): 124309. http://dx.doi.org/10.1063/5.0083033.

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A self-consistent mean field direct simulation Monte Carlo (SCMFD) algorithm was recently proposed for simulating collision environments for a range of one-dimensional model systems. This work extends the one-dimensional SCMFD approach to three dimensions and introduces a variable time step (3D-vt-SCMFD), enabling the modeling of a considerably wider range of different collision environments. We demonstrate the performance of the augmented method by modeling a varied set of test systems: ideal gas mixtures, Poiseuille flow of argon, and expansion of gas into high vacuum. For the gas mixtures,
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Ferreira, Elise, Morgan Dal, Christophe Colin, et al. "Experimental and Numerical Analysis of Gas/Powder Flow for Different LMD Nozzles." Metals 10, no. 5 (2020): 667. http://dx.doi.org/10.3390/met10050667.

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The Laser Metal Deposition (LMD) process is an additive manufacturing method, which generates 3D structures through the interaction of a laser beam and a gas/powder stream. The stream diameter, surface density and focal plan position affect the size, efficiency and regularity of the deposit tracks. Therefore, a precise knowledge of the gas/powder streams characteristics is essential to control the process and improve its reliability and reproducibly for industrial applications. This paper proposes multiple experimental techniques, such as gas pressure measurement, optical and weighting methods
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Ofman, Leon, and Tongjiang Wang. "Excitation and Damping of Slow Magnetosonic Waves in Flaring Hot Coronal Loops: Effects of Compressive Viscosity." Astrophysical Journal 926, no. 1 (2022): 64. http://dx.doi.org/10.3847/1538-4357/ac4090.

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Abstract Slow magnetosonic waves associated with flares were observed in coronal loops by Solar and Heliospheric Observatory/Solar Ultraviolet Measurements of Emitted Radiation, Solar Dynamics Observatory/Atmospheric Imaging Assembly in various EUV bandpasses, and other instruments. The excitation and damping of slow magnetosonic waves provides information on the magnetic, temperature, and density structure of the loops. Recently, it was found using 1.5D models that the thermal conduction is suppressed and compressive viscosity is enhanced in hot (T > 6 MK) flaring coronal loops. We model t
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Malfait, J., W. Homan, S. Maes, et al. "SPH modelling of wind-companion interactions in eccentric AGB binary systems." Astronomy & Astrophysics 652 (August 2021): A51. http://dx.doi.org/10.1051/0004-6361/202141161.

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Context. The late evolutionary stages of low- and intermediate-mass stars are characterised by mass loss through a dust-driven stellar wind. Recent observations reveal complex structures within these winds, which are believed to be formed primarily via an interaction with a companion. How these complexities arise, and which structures are formed in which type of systems, is still poorly understood. Particularly, there is a lack of studies investigating the structure formation in eccentric systems. Aims. We aim to improve our understanding of the wind morphology of eccentric asymptotic giant br
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An, Zhaozhou, and Sergey E. Koposov. "Constraining the shape of Milky Way satellites with distance gradients." Monthly Notices of the Royal Astronomical Society 511, no. 3 (2022): 4316–32. http://dx.doi.org/10.1093/mnras/stac308.

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ABSTRACT We combine the Dark Energy Camera Legacy Survey DR8 photometry with Gaia photometry to study the 3D structure of Bootes I, Draco, Ursa Minor, Sextans, and Sculptor dwarf galaxies using blue horizontal branch (BHB) stars as distance indicators. We construct a new colour–absolute magnitude of BHB stars that we use to measure the distance gradients within the body of the dwarf galaxies. We detect a statistically significant non-zero gradient only in Sextans and Sculptor. Through modelling of the gradient and 2D density of the systems by triaxial Plummer models, we find that the distance
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Banda-Barragán, W. E., F. J. Zertuche, C. Federrath, J. García Del Valle, M. Brüggen, and A. Y. Wagner. "On the dynamics and survival of fractal clouds in galactic winds." Monthly Notices of the Royal Astronomical Society 486, no. 4 (2019): 4526–44. http://dx.doi.org/10.1093/mnras/stz1040.

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Abstract Recent observations suggest that dense gas clouds can survive even in hot galactic winds. Here we show that the inclusion of turbulent densities with different statistical properties has significant effects on the evolution of wind-swept clouds. We investigate how the initial standard deviation of the lognormal density field influences the dynamics of quasi-isothermal clouds embedded in supersonic winds. We compare uniform, fractal solenoidal, and fractal compressive cloud models in both 3D and 2D hydrodynamical simulations. We find that the processes of cloud disruption and dense gas
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Yuan, Lei, Zunlong Jin, Penghui Yang, Youchen Yang, Dingbiao Wang, and Xiaotang Chen. "Numerical Analysis of the Influence of Different Flow Patterns on Power and Reactant Transmission in Tubular-Shaped PEMFC." Energies 14, no. 8 (2021): 2127. http://dx.doi.org/10.3390/en14082127.

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The influence of a tubular structure PEMFC (proton exchange membrane fuel cell) with different flow patterns is investigated in this study. A complete 3D non-isothermal model is constructed for square and circular tubular PEMFCs, and the distribution of oxygen and water concentration in cathode channels, current density, power density and cell net power are studied. To this end, the four arrangements of tubular PEMFC are square chordal (SC), square peripheral (SP), circular chordal (CC) and circular peripheral (CP). The calculation of the effective area and boundary conditions remains the same
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Dande, Suresh, Robert R. Stewart, and Nikolay Dyaur. "Effect of Fluids on the Elastic Properties of 3D-Printed Anisotropic Rock Models." Petrophysics – The SPWLA Journal of Formation Evaluation and Reservoir Description 62, no. 5 (2021): 537–52. http://dx.doi.org/10.30632/pjv62n5-2020a7.

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Laboratory physical models play an important role in understanding rock properties and wave propagation, both theoretically and at the field scale. In some cases, 3D-printing technology can be adopted to construct complex rock models faster, more inexpensively, and with more specific features than previous model-building techniques. In this study, we use 3D-printed rock models to assist in understanding the effects of various fluids (air, water, engine oil, crude oil, and glycerol) on the models’ elastic properties. We first used a 3D-printed, 1-in. cube-shaped layered model. This model was cr
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Meguid, S. A., G. Shagal, and J. C. Stranart. "Development and Validation of Novel FE Models for 3D Analysis of Peening of Strain-Rate Sensitive Materials." Journal of Engineering Materials and Technology 129, no. 2 (2006): 271–83. http://dx.doi.org/10.1115/1.2712469.

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In this paper, we provide two different symmetry cells to describe the shot-peening process. In this multiple impingement model, we study the dynamic behavior of TI-6Al-4V targets subjected to a large number of shots. Three-dimensional elastoplastic finite element analysis (FEA) of the process was conducted using these two symmetry cells for strain-rate sensitive targets and rigid shots. The basic symmetry cell is assigned a target surface area C×C, where C is one half of separation distance between adjacent shots. The second “enhanced” symmetry cell is assigned a target surface area 2C×2C thu
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Lee, Young-Min, Hyosun Kim, and Hee-Won Lee. "Formation of the Asymmetric Accretion Disk from Stellar Wind Accretion in an S-type Symbiotic Star." Astrophysical Journal 931, no. 2 (2022): 142. http://dx.doi.org/10.3847/1538-4357/ac67d6.

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Abstract The accretion process in a typical S-type symbiotic star, targeting AG Draconis, is investigated through 3D hydrodynamical simulations using the FLASH code. Regardless of the wind velocity of the giant star, an accretion disk surrounding the white dwarf is always formed. In models where the wind is faster than the orbital velocity of the white dwarf, the disk size and accretion rate are consistent with the predictions under Bondi–Hoyle–Lyttleton (BHL) conditions. In slower-wind models, unlike the BHL predictions, the disk size does not grow, and the accretion rate increases to a consi
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Chen, Xin, and Yong Fang. "Simulation and Analysis of Scattering Channel Models in Three-Dimensional High-Speed Mobile Environment." Journal of Computational and Theoretical Nanoscience 13, no. 10 (2016): 6947–55. http://dx.doi.org/10.1166/jctn.2016.5652.

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A three-dimensional (3D) statistic channel model based on scattering characteristics is proposed to describe accurately the wireless channel under the scenarios of high-speed train (HST). This paper derives scattering density distribution function and scattering coefficient to represent the channel impulse response (CIR) of HST communication system, and deduces closed expressions of Doppler power spectrum (DPS) of mobile terminal. Expressions are also provided for categorizing and quantizing the scattering characteristics of wireless channels. By analyzing the Doppler spread of HST and compari
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Roberts, Alan W., Richard W. Hobbs, Michael Goldstein, Max Moorkamp, Marion Jegen, and Bjørn Heincke. "Joint stochastic constraint of a large data set from a salt dome." GEOPHYSICS 81, no. 2 (2016): ID1—ID24. http://dx.doi.org/10.1190/geo2015-0127.1.

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Understanding the uncertainty associated with large joint geophysical surveys, such as 3D seismic, gravity, and magnetotelluric (MT) studies, is a challenge, conceptually and practically. By demonstrating the use of emulators, we have adopted a Monte Carlo forward screening scheme to globally test a prior model space for plausibility. This methodology means that the incorporation of all types of uncertainty is made conceptually straightforward, by designing an appropriate prior model space, upon which the results are dependent, from which to draw candidate models. We have tested the approach o
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Adam, Erick, G. Perron, B. Milkereit, et al. "A review of high-resolution seismic profiling across the Sudbury, Selbaie, Noranda, and Matagami mining camps." Canadian Journal of Earth Sciences 37, no. 2-3 (2000): 503–16. http://dx.doi.org/10.1139/e99-064.

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Lithoprobe high-resolution seismic surveys have provided the first systematic images of the deep stratigraphy in four major Canadian mining camps (Noranda, Matagami, Sudbury, and Selbaie). Systematic compressional wave velocity and density measurements in deep boreholes have established that lithological contacts were the main impedance contrast imaged, although reflections from faults and deformation zones have also been observed. The strongest reflections are attributed to mafic intrusions and some sulphides and oxides. Integrating seismic, physical rock property measurements, and geological
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Baalmann, L. R., K. Scherer, J. Kleimann, H. Fichtner, D. J. Bomans, and K. Weis. "Simulating observable structures due to a perturbed interstellar medium in front of astrospheric bow shocks in 3D MHD." Astronomy & Astrophysics 650 (June 2021): A36. http://dx.doi.org/10.1051/0004-6361/202039836.

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Context. While the shapes of many observed bow shocks can be reproduced by simple astrosphere models, more elaborate approaches have recently been used to explain differing observable structures. Aims. By placing perturbations of an otherwise homogeneous interstellar medium in front of the astrospheric bow shock of the runaway blue supergiant λ Cephei, the observable structure of the model astrosphere is significantly altered, providing insight into the origin of perturbed bow shock images. Methods. Three-dimensional single-fluid magnetohydrodynamic (MHD) models of stationary astrospheres were
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Ji (季索清), Suoqing, S. Peng Oh, and Phillip Masterson. "Simulations of radiative turbulent mixing layers." Monthly Notices of the Royal Astronomical Society 487, no. 1 (2019): 737–54. http://dx.doi.org/10.1093/mnras/stz1248.

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ABSTRACTRadiative turbulent mixing layers should be ubiquitous in multi-phase gas with shear flow. They are a potentially attractive explanation for the high ions such as O vi seen in high-velocity clouds and the circumgalactic medium (CGM) of galaxies. We perform 3D magnetohydrohynamics (MHD) simulations with non-equilibrium (NEI) and photoionization modelling, with an eye towards testing simple analytic models. Even purely hydrodynamic collisional ionization equilibrium (CIE) calculations have column densities much lower than observations. Characteristic inflow and turbulent velocities are m
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Hühn, Sérgio, Adalene Silva, Francisco Ferreira, and Carla Braitenberg. "Mapping New IOCG Mineral Systems in Brazil: The Vale do Curaçá and Riacho do Pontal Copper Districts." Minerals 10, no. 12 (2020): 1074. http://dx.doi.org/10.3390/min10121074.

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The Vale do Curaçá and Riacho do Pontal copper districts are located within the northern part of the Archaean São Francisco Craton and represent two pulses of mineralization. The copper districts have been identified as Iron-Oxide-Copper-Gold (IOCG) classes of deposits. An older metallogenic event associated with the Caraíba copper deposit, which is located in the Vale do Curaçá district, is related to Palaeoproterozoic (ca. 2 to 2.2 Ga) hydrothermal processes. A younger Neoproterozoic (ca. 750 to 570 Ma) episode of volcanism and associated plutonism is represented by the Riacho do Pontal mine
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Abdullahi, Mustapha, and S. Oyadiji. "Acoustic Wave Propagation in Air-Filled Pipes Using Finite Element Analysis." Applied Sciences 8, no. 8 (2018): 1318. http://dx.doi.org/10.3390/app8081318.

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The major objective of this work is to develop an efficient Finite Element Analysis (FEA) procedure to simulate wave propagation in air-filled pipes accurately. The development of such a simulation technique is essential in the study of wave propagation in pipe networks such as oil and gas pipelines and urban water distribution networks. While numerical analysis using FEA seems superficially straight forward, this paper demonstrates that the element type and refinement used for acoustic FEA have a significant effect on the accuracy of the result achieved and the efficiency of the computation.
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Legal, Cédric, Patrice Klein, Anne-Marie Treguier, and Jerome Paillet. "Diagnosis of the Vertical Motions in a Mesoscale Stirring Region." Journal of Physical Oceanography 37, no. 5 (2007): 1413–24. http://dx.doi.org/10.1175/jpo3053.1.

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Abstract A high-resolution survey was conducted as part of the 2001 Programme Ocean Multidisciplinaire Meso Echelle (POMME 2) experiment in a region of the northeast Atlantic Ocean characterized by a large number of strongly interacting mesoscale eddies. The survey was located between mesoscale eddies in an area where the horizontal stirring processes were dominant. Diagnosis, using SeaSoar data combined with the analysis of altimeter data, reveals an energetic vertical velocity field involving elongated thin structures with alternate signs and amplitude up to 20 m day−1. The 3D dynamics invol
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Li, Qingman, Jie Liang, Qun Wang, et al. "Numerical Investigations of Urban Pollutant Dispersion and Building Intake Fraction with Various 3D Building Configurations and Tree Plantings." International Journal of Environmental Research and Public Health 19, no. 6 (2022): 3524. http://dx.doi.org/10.3390/ijerph19063524.

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Rapid urbanisation and rising vehicular emissions aggravate urban air pollution. Outdoor pollutants could diffuse indoors through infiltration or ventilation, leading to residents’ exposure. This study performed CFD simulations with a standard k-ε model to investigate the impacts of building configurations and tree planting on airflows, pollutant (CO) dispersion, and personal exposure in 3D urban micro-environments (aspect ratio = H/W = 30 m, building packing density λp = λf = 0.25) under neutral atmospheric conditions. The numerical models are well validated by wind tunnel data. The impacts o
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