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Journal articles on the topic 'Reconstruction and flux simulations'

Author: Grafiati

Published: 25 January 2025

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1

Zerrik, E., and H. Bourray. "Flux reconstruction: sensors and simulations." Sensors and Actuators A: Physical 109, no. 1-2 (2003): 34–46. http://dx.doi.org/10.1016/s0924-4247(03)00358-3.

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2

Khazari, Adil, and Ali Boutoulout. "Flux reconstruction for hyperbolic systems: Sensors and simulations." Evolution Equations & Control Theory 4, no. 2 (2015): 177–92. http://dx.doi.org/10.3934/eect.2015.4.177.

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Cruz, Fernando, José P. Faria, Miguel Rocha, Isabel Rocha, and Oscar Dias. "A review of methods for the reconstruction and analysis of integrated genome-scale models of metabolism and regulation." Biochemical Society Transactions 48, no. 5 (2020): 1889–903. http://dx.doi.org/10.1042/bst20190840.

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The current survey aims to describe the main methodologies for extending the reconstruction and analysis of genome-scale metabolic models and phenotype simulation with Flux Balance Analysis mathematical frameworks, via the integration of Transcriptional Regulatory Networks and/or gene expression data. Although the surveyed methods are aimed at improving phenotype simulations obtained from these models, the perspective of reconstructing integrated genome-scale models of metabolism and gene expression for diverse prokaryotes is still an open challenge.

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Zunz, V., and H. Goosse. "Influence of freshwater input on the skill of decadal forecast of sea ice in the Southern Ocean." Cryosphere 9, no. 2 (2015): 541–56. http://dx.doi.org/10.5194/tc-9-541-2015.

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Abstract. Recent studies have investigated the potential link between the freshwater input derived from the melting of the Antarctic ice sheet and the observed recent increase in sea ice extent in the Southern Ocean. In this study, we assess the impact of an additional freshwater flux on the trend in sea ice extent and concentration in simulations with data assimilation, spanning the period 1850–2009, as well as in retrospective forecasts (hindcasts) initialised in 1980. In the simulations with data assimilation, the inclusion of an additional freshwater flux that follows an autoregressive pro

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Trojak, W., N. R. Vadlamani, J. Tyacke, F. D. Witherden, and A. Jameson. "Artificial compressibility approaches in flux reconstruction for incompressible viscous flow simulations." Computers & Fluids 247 (October 2022): 105634. http://dx.doi.org/10.1016/j.compfluid.2022.105634.

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Wilson, David J., Allison Youngblood, Odette Toloza та ін. "Testing Lyα Emission-line Reconstruction Routines at Multiple Velocities in One System". Astrophysical Journal 936, № 2 (2022): 189. http://dx.doi.org/10.3847/1538-4357/ac87a8.

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Abstract The 1215.67 Å H i Lyα emission line dominates the ultraviolet flux of low-mass stars, including the majority of known exoplanet hosts. Unfortunately, strong attenuation by the interstellar medium (ISM) obscures the line core in most stars, requiring the intrinsic Lyα flux to be reconstructed based on fits to the line wings. We present a test of the widely used Lyα emission-line reconstruction code lyapy using phase-resolved, medium-resolution STIS G140M observations of the close white dwarf–M dwarf binary EG UMa. The Doppler shifts induced by the binary orbital motion move the Lyα emi

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Huang, Lawrence, Rupert A. C. Croft та Hitesh Arora. "Deep forest: Neural network reconstruction of the Lyman-α forest". Monthly Notices of the Royal Astronomical Society 506, № 4 (2021): 5212–22. http://dx.doi.org/10.1093/mnras/stab2041.

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ABSTRACT We explore the use of Deep Learning to infer physical quantities from the observable transmitted flux in the Ly α forest. We train a Neural Network using redshift z = 3 outputs from cosmological hydrodynamic simulations and mock data sets constructed from them. We evaluate how well the trained network is able to reconstruct the optical depth for Ly α forest absorption from noisy and often saturated transmitted flux data. The Neural Network outperforms an alternative reconstruction method involving log inversion and spline interpolation by approximately a factor of 2 in the optical dep

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Zhou, Bowen, and Fotini Katopodes Chow. "Large-Eddy Simulation of the Stable Boundary Layer with Explicit Filtering and Reconstruction Turbulence Modeling." Journal of the Atmospheric Sciences 68, no. 9 (2011): 2142–55. http://dx.doi.org/10.1175/2011jas3693.1.

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Abstract Large-eddy simulation (LES) of the stably stratified atmospheric boundary layer is performed using an explicit filtering and reconstruction approach with a finite difference method. Turbulent stresses are split into the resolvable subfilter-scale and subgrid-scale stresses. The former are recovered from a reconstruction approach, and the latter are represented by a dynamic eddy-viscosity model. The resulting dynamic reconstruction model (DRM) can sustain resolved turbulence with less stringent resolution requirements than conventional closure models, even under strong atmospheric stab

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Zorrilla, Francisco, Filip Buric, Kiran R. Patil, and Aleksej Zelezniak. "metaGEM: reconstruction of genome scale metabolic models directly from metagenomes." Nucleic Acids Research 49, no. 21 (2021): e126-e126. http://dx.doi.org/10.1093/nar/gkab815.

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Abstract Metagenomic analyses of microbial communities have revealed a large degree of interspecies and intraspecies genetic diversity through the reconstruction of metagenome assembled genomes (MAGs). Yet, metabolic modeling efforts mainly rely on reference genomes as the starting point for reconstruction and simulation of genome scale metabolic models (GEMs), neglecting the immense intra- and inter-species diversity present in microbial communities. Here, we present metaGEM (https://github.com/franciscozorrilla/metaGEM), an end-to-end pipeline enabling metabolic modeling of multi-species com

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Liu, Chunlei, and Richard P. Allan. "Unrealistic Increases in Wind Speed Explain Reduced Eastern Pacific Heat Flux in Reanalyses." Journal of Climate 31, no. 8 (2018): 2981–93. http://dx.doi.org/10.1175/jcli-d-17-0642.1.

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Abstract Tropical eastern Pacific sea surface temperature plays a pivotal role in mechanisms that determine global mean surface temperature variability. In this study, the surface flux contribution to recent cooling of the tropical eastern Pacific is investigated using data from three atmospheric reanalyses with full assimilation of observations, an observation-based net surface energy flux reconstruction, and 15 atmosphere-only climate model simulations. For ERA-Interim, 78% of the decrease in net surface flux (−0.65 W m−2 yr−1 over 1988–2008) is explained by the latent heat flux variability.

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11

Virtanen, I. O. I., A. A. Pevtsov, I. I. Virtanen, and K. Mursula. "Reconstructing solar magnetic fields from historical observations." Astronomy & Astrophysics 652 (August 2021): A79. http://dx.doi.org/10.1051/0004-6361/202140656.

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Context. The evolution of the photospheric magnetic field can be simulated with surface flux transport (SFT) simulations, which allow for the study of the evolution of the entire field, including polar fields, solely using observations of the active regions. However, because only one side of the Sun is visible at a time, active regions that emerge and decay on the far-side are not observed and not included in the simulations. As a result, some flux is missed. Aims. We construct additional active regions and apply them to the far-side of the Sun in an SFT simulation to assess the possible effec

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Spring, Aaron, István Dunkl, Hongmei Li, Victor Brovkin, and Tatiana Ilyina. "Trivial improvements in predictive skill due to direct reconstruction of the global carbon cycle." Earth System Dynamics 12, no. 4 (2021): 1139–67. http://dx.doi.org/10.5194/esd-12-1139-2021.

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Abstract. State-of-the art climate prediction systems have recently included a carbon component. While physical-state variables are assimilated in reconstruction simulations, land and ocean biogeochemical state variables adjust to the state acquired through this assimilation indirectly instead of being assimilated themselves. In the absence of comprehensive biogeochemical reanalysis products, such an approach is pragmatic. Here we evaluate a potential advantage of having perfect carbon cycle observational products to be used for direct carbon cycle reconstruction. Within an idealized perfect-m

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Luo, Jun, Lijun Xuan, and Kun Xu. "Comparison of Fifth-Order WENO Scheme and Finite Volume WENO-Gas-Kinetic Scheme for Inviscid and Viscous Flow Simulation." Communications in Computational Physics 14, no. 3 (2013): 599–620. http://dx.doi.org/10.4208/cicp.110212.021112a.

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AbstractThe development of high-order schemes has been mostly concentrated on the limiters and high-order reconstruction techniques. In this paper, the effect of the flux functions on the performance of high-order schemes will be studied. Based on the same WENO reconstruction, two schemes with different flux functions, i.e., the fifth-order WENO method and the WENO-Gas-kinetic scheme (WENO-GKS), will be compared. The fifth-order finite difference WENO-SW scheme is a characteristic variable reconstruction based method which uses the Steger-Warming flux splitting for inviscid terms, the sixth-or

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Mihalache, Ovidiu, and Toshihiko Yamaguchi. "Fast reconstruction of the magnetization of a Halbach magnet in EMAT using experimental measurements." International Journal of Applied Electromagnetics and Mechanics 64, no. 1-4 (2020): 905–12. http://dx.doi.org/10.3233/jae-209404.

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The paper presents a fast and accurate algorithm to reconstruct the magnetization model of parallelepiped magnet (parts of a Halbach magnet array) or the Halbach magnet array used in an electromagnetic acoustic (EMAT) transducer. The model accuracy is validated against measurements of the magnetic flux distributions above surface of block magnets or Halbach magnet array using 2D/3D theoretical formula to compute magnetic flux distribution, validated by 2D/3D FEM simulations, and based on a non-uniform distribution of reconstructed magnetization model (using only main magnetization component).

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Sajib, Saurav Z. K., Munish Chauhan, Oh In Kwon, and Rosalind J. Sadleir. "Magnetic-resonance-based measurement of electromagnetic fields and conductivity in vivo using single current administration—A machine learning approach." PLOS ONE 16, no. 7 (2021): e0254690. http://dx.doi.org/10.1371/journal.pone.0254690.

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Diffusion tensor magnetic resonance electrical impedance tomography (DT-MREIT) is a newly developed technique that combines MR-based measurements of magnetic flux density with diffusion tensor MRI (DT-MRI) data to reconstruct electrical conductivity tensor distributions. DT-MREIT techniques normally require injection of two independent current patterns for unique reconstruction of conductivity characteristics. In this paper, we demonstrate an algorithm that can be used to reconstruct the position dependent scale factor relating conductivity and diffusion tensors, using flux density data measur

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Sahade, Abril, Angelos Vourlidas, Laura A. Balmaceda, and Mariana Cécere. "Understanding the Deflection of the “Cartwheel CME”: Data Analysis and Modeling." Astrophysical Journal 953, no. 2 (2023): 150. http://dx.doi.org/10.3847/1538-4357/ace420.

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Abstract We study the low corona evolution of the “Cartwheel” coronal mass ejection (CME; 2008 April 9) by reconstructing its three-dimensional path and modeling it with magnetohydrodynamic simulations. This event exhibited a double deflection that has been reported and analyzed in previous works but whose underlying cause remained unclear. The Cartwheel CME traveled toward a coronal hole (CH) and against the magnetic gradients. Using a high-cadence, full-trajectory reconstruction, we accurately determine the location of the magnetic flux rope (MFR) and, consequently, the magnetic environment

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Dzanic, T., S. S. Girimaji, and F. D. Witherden. "Partially-averaged Navier–Stokes simulations of turbulence within a high-order flux reconstruction framework." Journal of Computational Physics 456 (May 2022): 110992. http://dx.doi.org/10.1016/j.jcp.2022.110992.

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Le Bras, Sophie, Hugues Deniau, and Christophe Bogey. "A technique of flux reconstruction at the interfaces of nonconforming grids for aeroacoustic simulations." International Journal for Numerical Methods in Fluids 91, no. 12 (2019): 587–614. http://dx.doi.org/10.1002/fld.4767.

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19

Heng, Yi, Lars Hoffmann, Sabine Griessbach, Thomas Rößler, and Olaf Stein. "Inverse transport modeling of volcanic sulfur dioxide emissions using large-scale simulations." Geoscientific Model Development 9, no. 4 (2016): 1627–45. http://dx.doi.org/10.5194/gmd-9-1627-2016.

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Abstract. An inverse transport modeling approach based on the concepts of sequential importance resampling and parallel computing is presented to reconstruct altitude-resolved time series of volcanic emissions, which often cannot be obtained directly with current measurement techniques. A new inverse modeling and simulation system, which implements the inversion approach with the Lagrangian transport model Massive-Parallel Trajectory Calculations (MPTRAC) is developed to provide reliable transport simulations of volcanic sulfur dioxide (SO2). In the inverse modeling system MPTRAC is used to pe

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20

Jacobus, Cooper, Peter Harrington та Zarija Lukić. "Reconstructing Lyα Fields from Low-resolution Hydrodynamical Simulations with Deep Learning". Astrophysical Journal 958, № 1 (2023): 21. http://dx.doi.org/10.3847/1538-4357/acfcb5.

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Abstract Hydrodynamical cosmological simulations are a powerful tool for accurately predicting the properties of the intergalactic medium (IGM) and for producing mock skies that can be compared against observational data. However, the need to resolve density fluctuation in the IGM puts a stringent requirement on the resolution of such simulations, which in turn limits the volumes that can be modeled, even on the most powerful supercomputers. In this work, we present a novel modeling method that combines physics-driven simulations with data-driven generative neural networks to produce outputs t

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Gazith, Dotan, and Barak Zackay. "Precision Speckle Pattern Reconstruction for High-contrast Imaging." Astronomical Journal 167, no. 2 (2024): 53. http://dx.doi.org/10.3847/1538-3881/ad0b6f.

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Abstract In high-contrast imaging, a large instrumental, technological, and algorithmic effort is made to reduce residual speckle noise and improve the detection capabilities. In this work, we explore the potential of using a precise physical description of speckle images, in conjunction with the optimal detection statistic to perform high-contrast imaging. Our method uses short-exposure speckle images, reconstructing the point-spread function (PSF) of each image with phase retrieval algorithms. Using the reconstructed PSFs, we calculate the optimal detection statistic for all images. We analy

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Vásquez Anacona, Hugo, Cristian Mattar, Nicolás G. Alonso-de-Linaje, Héctor H. Sepúlveda, and Jessica Crisóstomo. "Wind Simulations over Western Patagonia Using the Weather Research and Forecasting model and Reanalysis." Atmosphere 14, no. 7 (2023): 1062. http://dx.doi.org/10.3390/atmos14071062.

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The Chilean Western Patagonia has the highest wind potential resources in South America. Its complex terrain deserves a special attention for wind modeling and assessments. In this work, we have performed a comprehensive meso-scale climate simulation on Weather Research and Forecasting (WRF) in order to provide new insights into the wind climatology in Western Patagonia. Simulations were carried out from 1989 to 2020, and we considered a previous sensitivity analysis for their configuration. In situ data from a wind mast, meteorological information and data from eddy flux stations were used to

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23

Dash, Soumyaranjan, Marc L. DeRosa, Mausumi Dikpati, et al. "Ensemble Kalman Filter Data Assimilation into the Surface Flux Transport Model to Infer Surface Flows: An Observing System Simulation Experiment." Astrophysical Journal 975, no. 2 (2024): 288. http://dx.doi.org/10.3847/1538-4357/ad7eac.

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Abstract Knowledge of the global magnetic field distribution and its evolution on the Sun’s surface is crucial for modeling the coronal magnetic field, understanding the solar wind dynamics, computing the heliospheric open flux distribution, and predicting the solar cycle strength. As the far side of the Sun cannot be observed directly and high-latitude observations always suffer from projection effects, we often rely on surface flux transport (SFT) simulations to model the long-term global magnetic field distribution. Meridional circulation, the large-scale north–south component of the surfac

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Teh, Wai-Leong. "Multiple Flux Rope Dynamics: MMS Observations and Reconstruction Results." Astrophysical Journal 969, no. 2 (2024): 96. http://dx.doi.org/10.3847/1538-4357/ad47f9.

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Abstract A series of six ion-scale magnetic flux ropes (FR1–6) and a thin current sheet, encountered by Magnetospheric Multiscale spacecraft in the magnetosheath side of the dayside magnetopause boundary layer, are studied for multiple flux rope dynamics in terms of energy conversion and two-dimensional geometry structure. The thin current sheet is identified in between FR1 and FR2. The energy exchange between electromagnetic fields and plasmas is dynamic in FR1–5 and also surrounding the flux ropes, while a low-energy conversion rate is seen in FR6. Different energy conversions exist in the f

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Shi, Jingchang, and Hong Yan. "Turbulence amplification in the shock wave/turbulent boundary layer interaction over compression ramp by the flux reconstruction method." Physics of Fluids 35, no. 1 (2023): 016122. http://dx.doi.org/10.1063/5.0134222.

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Wall-resolved large eddy simulation on a supersonic turbulent boundary layer over a [Formula: see text] compression ramp is performed under the framework of high order discontinuous methods for a free-stream Mach number [Formula: see text] and Reynolds number [Formula: see text]. The turbulent flow is resolved by the high order flux reconstruction method, and the shock is captured by a high-resolution, but stable weighted essentially non-oscillation limiter. The solver used in this paper is validated by the double Mach reflection case and the Taylor–Green vortex case. The results of shock wave

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Kang, Myeongseok, and Donghyun You. "A Low Dissipative and Stable Cell-Centered Finite Volume Method with the Simultaneous Approximation Term for Compressible Turbulent Flows." Mathematics 9, no. 11 (2021): 1206. http://dx.doi.org/10.3390/math9111206.

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A simultaneous-approximation term is a non-reflecting boundary condition that is usually accompanied by summation-by-parts schemes for provable time stability. While a high-order convective flux based on reconstruction is often employed in a finite-volume method for compressible turbulent flow, finite-volume methods with the summation-by-parts property involve either equally weighted averaging or the second-order central flux for convective fluxes. In the present study, a cell-centered finite-volume method for compressible Naiver–Stokes equations was developed by combining a simultaneous-appro

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Brochard, G., J. Bao, C. Liu, et al. "Verification and validation of linear gyrokinetic and kinetic-MHD simulations for internal kink instability in DIII-D tokamak." Nuclear Fusion 62, no. 3 (2022): 036021. http://dx.doi.org/10.1088/1741-4326/ac48a6.

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Abstract Verification and linear validation of the internal kink instability in tokamak have been performed for both gyrokinetic (GTC) and kinetic-MHD codes (GAM-solver, M3D-C1-K, NOVA, XTOR-K). Using realistic magnetic geometry and plasma profiles from the same equilibrium reconstruction of the DIII-D shot #141216, these codes exhibit excellent agreement for the growth rate and mode structure of the internal kink mode when all kinetic effects are suppressed. The simulated radial mode structures, obtained from linear simulations, are in reasonable agreement with the normalised electron cyclotr

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Ni, Zining, Jinsen Xie, Muhammad Abdul Wasaye, Erpin Zhang, and Tao Yu. "Effect of Higher-Order Harmonics on the Steady-State Neutron Flux in Accelerator-Driven Subcritical Reactors." International Journal of Energy Research 2023 (April 5, 2023): 1–14. http://dx.doi.org/10.1155/2023/4114886.

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Higher-order neutron fluxes (i.e., higher-order harmonics) are widely applied in perturbation theory and modal kinetics, and they are important for research on the physical characteristics of accelerator-driven subcritical reactors (ADSRs). This paper presents a computational scheme for reconstructing the neutron flux in the steady state according to the biorthogonal properties of the forward and adjoint neutron fluxes, which can be used to analyze how higher-order harmonics affect the steady-state neutron flux under λ - and prompt α -modes. Simulation results indicated that a modal synthesis

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MIYAJI, Koji, and Rei NAGASAWA. "Extension of the Flux Reconstruction Method to High-Reynolds Number RANS Simulations around High-Lift Devices." TRANSACTIONS OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES 60, no. 1 (2017): 18–26. http://dx.doi.org/10.2322/tjsass.60.18.

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Agoshkov, Valery I., Eugene I. Parmuzin, Natalia B. Zakharova, and Victor P. Shutyaev. "Variational assimilation with covariance matrices of observation data errors for the model of the Baltic Sea dynamics." Russian Journal of Numerical Analysis and Mathematical Modelling 33, no. 3 (2018): 149–60. http://dx.doi.org/10.1515/rnam-2018-0013.

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Abstract The mathematical model of the Baltic Sea dynamics developed at the Institute of Numerical Mathematics of RAS is considered. The problem of variational assimilation of average daily data for the sea surface temperature (SST) is formulated and studied with the use of covariance matrices of observation data errors. Based on variational assimilation of satellite observation data, we propose an algorithm for solving the inverse problem of the heat flux reconstruction on the sea surface. The results of numerical experiments on reconstruction of the heat flux function are presented for the p

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Pereira, Carlos A., and Brian C. Vermeire. "Performance and accuracy of hybridized flux reconstruction schemes." Journal of Computational Physics 457 (May 2022): 111039. http://dx.doi.org/10.1016/j.jcp.2022.111039.

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Ma, Libin, Chao Yan, and Jian Yu. "A Modal-Decay-Based Shock-Capturing Approach for High-Order Flux Reconstruction Method." Aerospace 10, no. 1 (2022): 14. http://dx.doi.org/10.3390/aerospace10010014.

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The increasing demand for high-fidelity simulations of compressible turbulence on complex geometries poses a number of challenges for numerical schemes, and plenty of high-order methods have been developed. The high-order methods may encounter spurious oscillations or even blow up for strongly compressible flows, and a number of approaches have been developed, such as slope limiters and artificial viscosity models. In the family of artificial viscosity, which measures smoothness using the modal coefficients, the averaged modal decay (MDA) model employs all of the modes instead of only the high

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Kovbasa, S., S. Dymko, and M. Zhelinskyi. "SPEED OBSERVER FOR SENSORLESS ENERGY GENERATION SYSTEMS BASED ON FIELD ORIENTED INDUCTION GENERATOR." ELECTRICAL AND COMPUTER SYSTEMS 33, no. 108 (2020): 9–15. http://dx.doi.org/10.15276/eltecs.32.108.2020.1.

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The paper presents a novel adaptive speed – rotor flux linkage observer for sensorless field oriented control of induction generators. The proposed solution is based on Matsuse observer structure to- gether with specially designed correction terms and utilize current measurement and calculated stator volt- ages for real-time flux and speed reconstruction. A special coordinate transformation is used to avoid non- linear parametrization in the right side of flux linkages differential equations. Adaptive observer is designed in two steps: at the first step nonadaptive flux linkage observer is des

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Zhu, Hui, Song Fu, Lei Shi, and Z. J. Wang. "Implicit Large-Eddy Simulation for the High-Order Flux Reconstruction Method." AIAA Journal 54, no. 9 (2016): 2721–33. http://dx.doi.org/10.2514/1.j054826.

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Virtanen, I. O. I., I. I. Virtanen, A. A. Pevtsov, L. Bertello, A. Yeates, and K. Mursula. "Reconstructing solar magnetic fields from historical observations." Astronomy & Astrophysics 627 (June 25, 2019): A11. http://dx.doi.org/10.1051/0004-6361/201935606.

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Aims. The evolution of the photospheric magnetic field has only been regularly observed since the 1970s. The absence of earlier observations severely limits our ability to understand the long-term evolution of solar magnetic fields, especially the polar fields that are important drivers of space weather. Here, we test the possibility to reconstruct the large-scale solar magnetic fields from Ca II K line observations and sunspot magnetic field observations, and to create synoptic maps of the photospheric magnetic field for times before modern-time magnetographic observations. Methods. We recons

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Frasson, Thomas, Stéphane Labrosse, Henri-Claude Nataf, Nicolas Coltice, and Nicolas Flament. "On the impact of true polar wander on heat flux patterns at the core–mantle boundary." Solid Earth 15, no. 5 (2024): 617–37. http://dx.doi.org/10.5194/se-15-617-2024.

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Abstract. The heat flux across the core–mantle boundary (CMB) is a fundamental variable for Earth evolution and internal dynamics. Seismic tomography provides access to seismic heterogeneities in the lower mantle, which can be related to present-day thermal heterogeneities. Alternatively, mantle convection models can be used to either infer past CMB heat flux or to produce statistically realistic CMB heat flux patterns in self-consistent models. Mantle dynamics modifies the inertia tensor of the Earth, which implies a rotation of the Earth with respect to its spin axis, a phenomenon called tru

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TAN, X., J. X. ZHONG, and G. W. YANG. "GROWTH MECHANISM OF RING SHAPED NANOSTRUCTURES SELF-ASSEMBLY UPON DROPLET EPITAXY." Surface Review and Letters 19, no. 03 (2012): 1250029. http://dx.doi.org/10.1142/s0218625x12500291.

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A quantitatively kinetic model has been established to address the self-assembly of the ring shaped nanostructures upon the droplet epitaxy via kinetic Monte Carlo simulations. The theoretical predictions about the temperature and As flux dependences of the self-assembly of the ring shaped nanostructures were in well agreement with recent experiments. It was found that the morphological evolution of the ring shaped nanostructures was attributed to the cooperation of the enhanced diffusion barriers of free Ga atoms in the inner ring region and the effects of the surface reconstruction around th

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Watanabe, Michio, Hiroaki Tatebe, Hiroshi Koyama, Tomohiro Hajima, Masahiro Watanabe, and Michio Kawamiya. "Importance of El Niño reproducibility for reconstructing historical CO<sub>2</sub> flux variations in the equatorial Pacific." Ocean Science 16, no. 6 (2020): 1431–42. http://dx.doi.org/10.5194/os-16-1431-2020.

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Abstract. Based on a set of climate simulations utilizing two kinds of Earth system models (ESMs) in which observed ocean hydrographic data are assimilated using exactly the same data assimilation procedure, we have clarified that the successful simulation of the observed air–sea CO2 flux variations in the equatorial Pacific is tightly linked to the reproducibility of coupled physical air–sea processes. When an ESM with a weaker ENSO (El Niño–Southern Oscillations) amplitude than that of the observations was used for historical simulations with ocean data assimilation, the observed equatorial

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Todarello, Elisa, Andre Scaffidi, Marco Regis, and Marco Taoso. "Constraining below-threshold radio source counts with machine learning." Journal of Cosmology and Astroparticle Physics 2024, no. 01 (2024): 062. http://dx.doi.org/10.1088/1475-7516/2024/01/062.

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Abstract We propose a machine-learning-based technique to determine the number density of radio sources as a function of their flux density, for use in next-generation radio surveys. The method uses a convolutional neural network trained on simulations of the radio sky to predict the number of sources in several flux bins. To train the network, we adopt a supervised approach wherein we simulate training data stemming from a large domain of possible number count models going down to fluxes a factor of 100 below the threshold for source detection. We test the model reconstruction capabilities as

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Kahnt, Maik, Konstantin Klementiev, Vahid Haghighat, et al. "Measurement of the coherent beam properties at the CoSAXS beamline." Journal of Synchrotron Radiation 28, no. 6 (2021): 1948–53. http://dx.doi.org/10.1107/s1600577521009140.

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The CoSAXS beamline at the MAX IV Laboratory is a modern multi-purpose (coherent) small-angle X-ray scattering (CoSAXS) instrument, designed to provide intense and optionally coherent illumination at the sample position, enabling coherent imaging and speckle contrast techniques. X-ray tracing simulations used to design the beamline optics have predicted a total photon flux of 1012–1013 photons s−1 and a degree of coherence of up to 10% at 7.1 keV. The normalized degree of coherence and the coherent flux of this instrument were experimentally determined using the separability of a ptychographic

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Kahnt, Maik, Konstantin Klementiev, Vahid Haghighat, et al. "Measurement of the coherent beam properties at the CoSAXS beamline." Journal of Synchrotron Radiation 28, no. 6 (2021): 1948–53. http://dx.doi.org/10.1107/s1600577521009140.

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The CoSAXS beamline at the MAX IV Laboratory is a modern multi-purpose (coherent) small-angle X-ray scattering (CoSAXS) instrument, designed to provide intense and optionally coherent illumination at the sample position, enabling coherent imaging and speckle contrast techniques. X-ray tracing simulations used to design the beamline optics have predicted a total photon flux of 1012–1013 photons s−1 and a degree of coherence of up to 10% at 7.1 keV. The normalized degree of coherence and the coherent flux of this instrument were experimentally determined using the separability of a ptychographic

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Xiao, Tianbai. "A flux reconstruction kinetic scheme for the Boltzmann equation." Journal of Computational Physics 447 (December 2021): 110689. http://dx.doi.org/10.1016/j.jcp.2021.110689.

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Lu, Jinhua, Haiyan Lei, Chuanshan Dai, Liming Yang, and Chang Shu. "Analyses and reconstruction of the lattice Boltzmann flux solver." Journal of Computational Physics 453 (March 2022): 110923. http://dx.doi.org/10.1016/j.jcp.2021.110923.

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Hussey, Daniel Seth, Michael Cyrus Daugherty, Youngju Kim, David Jacobson, and Jacob Michael LaManna. "Simulations of Wolter Optics Tomography of a Fuel Cell." ECS Meeting Abstracts MA2023-02, no. 37 (2023): 1735. http://dx.doi.org/10.1149/ma2023-02371735mtgabs.

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Wolter optics present the opportunity to realize a practical neutron lens, which would convert a neutron imaging instrument from a pinhole camera to a microscope. This conversion would result in significant increases in neutron flux (up to 10,000 gain over the pinhole geometry) while maintaining high spatial resolution (about 3 μm). The Wolter optic system is currently being fabricated, and the first mirrors are expected to arrive in SEP 2023. As such, we focus this presentation on image simulation efforts. A ray tracing code has been developed that is able to simulate full three-dimensional i

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Montiel, Miguel, and Roque Corral. "Time-Inclined Method for High-Fidelity Rotor/Stator Simulations." Aerospace 10, no. 5 (2023): 475. http://dx.doi.org/10.3390/aerospace10050475.

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The application of the time-inclined method in a fourth-order unstructured flux-reconstruction code for turbomachinery is demonstrated. Inviscid and viscous unsteady results due to the interaction of an incoming gust of total pressure with a linear cascade of flat plates and a linear cascade of T106A low-pressure turbine airfoils are reported. The agreement between the time-inclined method and the equivalent full-annulus multipassage solution is very high for both cases. Viscous solutions at Reynolds numbers of 104 and 105 were conducted. A high degree of matching was obtained between the time

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Shi, Jingchang, Hong Yan, and Z. J. Wang. "Flux Reconstruction Implementation of an Algebraic Wall Model for Large-Eddy Simulation." AIAA Journal 58, no. 7 (2020): 3051–62. http://dx.doi.org/10.2514/1.j058957.

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Bull, J. R., and A. Jameson. "Simulation of the Taylor–Green Vortex Using High-Order Flux Reconstruction Schemes." AIAA Journal 53, no. 9 (2015): 2750–61. http://dx.doi.org/10.2514/1.j053766.

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Skarolek, Vilem, and Koji Miyaji. "Numerical Simulation of Transitional Flow Past a Wing Using Flux Reconstruction Method." AIAA Journal 54, no. 4 (2016): 1424–37. http://dx.doi.org/10.2514/1.j054324.

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Yang, L. M., C. Shu, and J. Wu. "A Hybrid Lattice Boltzmann Flux Solver for Simulation of Viscous Compressible Flows." Advances in Applied Mathematics and Mechanics 8, no. 6 (2016): 887–910. http://dx.doi.org/10.4208/aamm.2015.m1172.

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AbstractIn this paper, a hybrid lattice Boltzmann flux solver (LBFS) is proposed for simulation of viscous compressible flows. In the solver, the finite volume method is applied to solve the Navier-Stokes equations. Different from conventional Navier-Stokes solvers, in this work, the inviscid flux across the cell interface is evaluated by local reconstruction of solution using one-dimensional lattice Boltzmann model, while the viscous flux is still approximated by conventional smooth function approximation. The present work overcomes the two major drawbacks of existing LBFS [28–31], which is u

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Yu, Hengyong, Changguo Ji, and Ge Wang. "SART-Type Image Reconstruction from Overlapped Projections." International Journal of Biomedical Imaging 2011 (2011): 1–7. http://dx.doi.org/10.1155/2011/549537.

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To maximize the time-integrated X-ray flux from multiple X-ray sources and shorten the data acquisition process, a promising way is to allow overlapped projections from multiple sources being simultaneously on without involving the source multiplexing technology. The most challenging task in this configuration is to perform image reconstruction effectively and efficiently from overlapped projections. Inspired by the single-source simultaneous algebraic reconstruction technique (SART), we hereby develop a multisource SART-type reconstruction algorithm regularized by a sparsity-oriented constrai

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