Letteratura scientifica selezionata sul tema "Reconstruction and flux simulations"

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Articoli di riviste sul tema "Reconstruction and flux simulations"

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Zerrik, E., e H. Bourray. "Flux reconstruction: sensors and simulations". Sensors and Actuators A: Physical 109, n. 1-2 (dicembre 2003): 34–46. http://dx.doi.org/10.1016/s0924-4247(03)00358-3.

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Khazari, Adil, e Ali Boutoulout. "Flux reconstruction for hyperbolic systems: Sensors and simulations". Evolution Equations & Control Theory 4, n. 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 e Oscar Dias. "A review of methods for the reconstruction and analysis of integrated genome-scale models of metabolism and regulation". Biochemical Society Transactions 48, n. 5 (17 settembre 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., e H. Goosse. "Influence of freshwater input on the skill of decadal forecast of sea ice in the Southern Ocean". Cryosphere 9, n. 2 (17 marzo 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 process improves the reconstruction of the trend in ice extent and concentration between 1980 and 2009. This is linked to a better efficiency of the data assimilation procedure but can also be due to a better representation of the freshwater cycle in the Southern Ocean. The results of the hindcast simulations show that an adequate initial state, reconstructed thanks to the data assimilation procedure including an additional freshwater flux, can lead to an increase in the sea ice extent spanning several decades that is in agreement with satellite observations. In our hindcast simulations, an increase in sea ice extent is obtained even in the absence of any major change in the freshwater input over the last decades. Therefore, while the additional freshwater flux appears to play a key role in the reconstruction of the evolution of the sea ice in the simulation with data assimilation, it does not seem to be required in the hindcast simulations. The present work thus provides encouraging results for sea ice predictions in the Southern Ocean, as in our simulation the positive trend in ice extent over the last 30 years is largely determined by the state of the system in the late 1970s.
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Trojak, W., N. R. Vadlamani, J. Tyacke, F. D. Witherden e A. Jameson. "Artificial compressibility approaches in flux reconstruction for incompressible viscous flow simulations". Computers & Fluids 247 (ottobre 2022): 105634. http://dx.doi.org/10.1016/j.compfluid.2022.105634.

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Wilson, David J., Allison Youngblood, Odette Toloza, Jeremy J. Drake, Kevin France, Cynthia S. Froning, Boris T. Gänsicke, Seth Redfield e Brian E. Wood. "Testing Lyα Emission-line Reconstruction Routines at Multiple Velocities in One System". Astrophysical Journal 936, n. 2 (1 settembre 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 emission line in and out of the region of strong ISM attenuation. Reconstructions of each spectrum should produce the same Lyα profile regardless of phase, under the well-justified assumption that there is no intrinsic line variability between observations. Instead, we find that the reconstructions underestimate the Lyα flux by almost a factor of 2 for the lowest velocity, most attenuated spectrum, due to a degeneracy between the intrinsic Lyα and ISM profiles. Our results imply that many stellar Lyα fluxes derived from G140M spectra reported in the literature may be underestimated, with potential consequences for, for example, estimates of extreme-ultraviolet stellar spectra and ultraviolet inputs into simulations of exoplanet atmospheres.
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Huang, Lawrence, Rupert A. C. Croft e Hitesh Arora. "Deep forest: Neural network reconstruction of the Lyman-α forest". Monthly Notices of the Royal Astronomical Society 506, n. 4 (19 luglio 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 depth root mean square error. We find no significant dependence in the improvement on input data signal to noise, although the gain is greatest in high optical depth regions. The Ly α forest optical depth studied here serves as a simple, one dimensional, example but the use of Deep Learning and simulations to approach the inverse problem in cosmology could be extended to other physical quantities and higher dimensional data.
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Zhou, Bowen, e Fotini Katopodes Chow. "Large-Eddy Simulation of the Stable Boundary Layer with Explicit Filtering and Reconstruction Turbulence Modeling". Journal of the Atmospheric Sciences 68, n. 9 (1 settembre 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 stability. This is achieved by proper representation of subfilter-scale (SFS) backscatter of turbulent kinetic energy (TKE). The flow structure and turbulence statistics for the moderately stable boundary layer (SBL) are analyzed with high-resolution simulations. The DRM simulations show good agreement with established empirical formulations such as flux and gradient-based surface similarity, even at relatively coarse resolution. Similar results can be obtained with traditional closure models at the cost of higher resolution. SBL turbulence under strong stability is also explored. Simulations show an intermittent presence of elevated TKE below the low-level jet. Overall, the explicit filtering and reconstruction approach is advantageous for simulations of the SBL. At coarse resolution, it can extend the working range of LES to stronger stability, while maintaining agreement to similarity theory; at fine resolution, good agreement with theoretical formulations provides confidence in the results and allows for detailed investigation of the flow structure under moderate to strong stability conditions.
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Zorrilla, Francisco, Filip Buric, Kiran R. Patil e Aleksej Zelezniak. "metaGEM: reconstruction of genome scale metabolic models directly from metagenomes". Nucleic Acids Research 49, n. 21 (6 ottobre 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 communities directly from metagenomes. The pipeline automates all steps from the extraction of context-specific prokaryotic GEMs from MAGs to community level flux balance analysis (FBA) simulations. To demonstrate the capabilities of metaGEM, we analyzed 483 samples spanning lab culture, human gut, plant-associated, soil, and ocean metagenomes, reconstructing over 14,000 GEMs. We show that GEMs reconstructed from metagenomes have fully represented metabolism comparable to isolated genomes. We demonstrate that metagenomic GEMs capture intraspecies metabolic diversity and identify potential differences in the progression of type 2 diabetes at the level of gut bacterial metabolic exchanges. Overall, metaGEM enables FBA-ready metabolic model reconstruction directly from metagenomes, provides a resource of metabolic models, and showcases community-level modeling of microbiomes associated with disease conditions allowing generation of mechanistic hypotheses.
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Liu, Chunlei, e Richard P. Allan. "Unrealistic Increases in Wind Speed Explain Reduced Eastern Pacific Heat Flux in Reanalyses". Journal of Climate 31, n. 8 (20 marzo 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. Latent heat flux variability differs between datasets, and this is investigated using a bulk formula. It is found that discrepancies in wind speed change explain contrasting latent heat flux trends across datasets. The significant increase in wind speed of 0.26 m s−1 decade−1 over the tropical eastern Pacific in ERA-Interim is not reproduced by satellite or buoy observations or atmosphere-only climate model simulations, casting questions on the reliability of reanalysis-based surface fluxes over the tropical eastern Pacific.
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Tesi sul tema "Reconstruction and flux simulations"

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Ntemos, George. "GPU-accelerated high-order scale-resolving simulations using the flux reconstruction approach". Thesis, Imperial College London, 2017. http://hdl.handle.net/10044/1/59135.

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High-order methods in Computational Fluid Dynamics (CFD) offer a potential route towards the resolution of hitherto intractable fluid-dynamics problems in industry. The Flux Reconstruction (FR) approach provides a unifying framework for a number of popular high-order methods such as the Discontinuous Galerkin (DG). Its suitability for use on unstructured grids along with its ability to facilitate massively parallelised implementation on architectures such as GPUs provide a means to tackle computationally challenging flows around complex geometries. Such a flow can be found in the rod-aerofoil tandem configuration: Complex, unsteady flow structures generated by and interacting with more than a single solid body are central to a number of applications in the aerospace industry. The current thesis attempts to demonstrate the suitability of the FR approach in successfully simulating the flow around a rod-aerofoil configuration. The in-house CFD solver employed in the research is presented and the FR implementation analysed. Computational grid resolution issues arising from the rod-aerofoil problem are studied and a novel strategy for the stabilisation of the computation is implemented in the form of local entropy stability. The results obtained are analysed and conclusions are drawn on the utility of the FR approach in the absence of a sub-grid scale model (Implicit LES - under-resolved DNS). The present work confirms the utility of local entropy stability for the stabilisation of the rod-aerofoil simulation of aerofoil-chord based Reynolds number of Re=480, 000. It will also demonstrate that the under-resolved DNS setup that resulted in a computational cost of approximately six hours for a single flow pass over the aerofoil chord on 200 Nvidia P100 GPUs resulted in moderate success for a significant portion of the flow dynamics, which not adequately predicted when compared with experiment. The latter led to a series of useful conclusions. The core of the conclusions involved the apparent over-prediction of time-averaged velocity and momentum deficits across wakes and as well as over-prediction of turbulent intensities. An identification of the problematic areas is therefore given and potential alleviation techniques outlined.
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Negre, Delphine. "Rationalisation de l’Accès aux Produits Naturels Fongiques par une Approche OSMAC in silico : Cas d’étude avec la modélisation du métabolisme de Penicillium rubens". Electronic Thesis or Diss., Nantes Université, 2024. http://www.theses.fr/2024NANU4038.

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Face à la résistance accrue aux antibiotiques menaçant la santé publique, la prospection de nouvelles molécules biologiquement actives est pressante. Les champignons filamenteux se distinguent par leur capacité à synthétiser une large gamme de produits naturels, sous l’influence de clusters de gènes biosynthétiques (BGC) qui orchestrent la production de métabolites spécialisés. Toutefois, de nombreux produits issus de ces BGCs n’ont pas encore été caractérisés et leur chimiodiversité demeure sous-explorée en raison de l’incapacité à activer l’ensemble de leur potentiel en laboratoire. L’approche OSMAC (One Strain Many Compound) permet de solliciter ce potentiel en variant les conditions de culture. Cependant, cette méthode reste complexe et coûteuse en raison de son caractère aléatoire et du grand nombre d’expérimentations nécessaires. L’optimisation de ces processus nécessite l’intégration de stratégies plus rationnelles et efficaces. A l’aide d’approches systémiques liées à la biologie des systèmes, les réseaux métaboliques à l’échelle du génome (GSMN) offrent une modélisation détaillée des voies métaboliques, des enzymes impliquées et des gènes associés, fournissant un aperçu précis du métabolisme. Dans ce cadre, nous proposons une stratégie alternative: l’OSMAC in silico. En reconstruisant un GSMN actualisé pour Penicillium rubens, nous avons pu étudier les réponses de son métabolisme sous divers scénarios nutritionnels. Cette modélisation a permis d’évaluer l’influence de différentes sources de carbone et d’azote sur sa croissance et la production de métabolites spécialisés, ouvrant ainsi de nouvelles perspectives pour optimiser la production de produits naturels
Given the pressing issue of increasing antibiotic resistance threatening public health, new biologically active molecule research is urgent. Filamentous fungi are charcterised by their ability to synthesise a wide range of natural products, driven by biosynthetic gene clusters (BGCs) that orchestrate the production of specialised metabolites. However, many products derived from these BGCs remain uncharacterised, and their chemodiversity is underexplored due to the inability to activate their full potential in laboratory settings. The OSMAC (One Strain Many Compounds) approach seeks to harness this potential through culture condition variations. Nevertheless, this method remains complex and costly due to its randomness and vast number of experiments required. Therefore, optimising these processes needs the integration of more rational and efficient strategies. Using systems biology approaches, genome-scale metabolic networks (GSMNs) provide detailed modeling of metabolic pathways, involved enzymes, and associated genes, offering a precise overview of metabolism. In this context, we propose an alternative strategiy: in silico OSMAC. By reconstructing an updated GSMN for Penicillium rubens , we studied its metabolic responses under various nutritional scenarios. This modelling enabled us to assess the influence of different carbon and nitrogen sources on growth and the production of specialised metabolites, thereby opening new prospects for optimising the production of natural products
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Delestre, Olivier. "Simulation du ruissellement d'eau de pluie sur des surfaces agricoles". Phd thesis, Université d'Orléans, 2010. http://tel.archives-ouvertes.fr/tel-00587197.

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L'objectif de ce travail est le développement d'un modèle et d'une méthode numérique adaptés à la simulation du ruissellement d'eau de pluie sur des surfaces agricoles. Pour cela, nous utilisons un système d'équations aux dérivées partielles pour les eaux peu profondes : le système de Saint Venant. La pluie et l'infiltration y sont pris en compte par l'ajout de termes source et le couplage avec un modèle d'infiltration. Le système étant hyperbolique et conservatif nous choisissons d'utiliser un schéma aux volumes finis avec reconstruction hydrostatique. Avec cette reconstruction nous obtenons un schéma permettant de traiter les équilibres stationnaires et les interfaces sec/mouillé dues aux événements pluvieux. Tout d'abord, nous effectuons une comparaison systématique de différents flux numériques, de différentes reconstructions d'ordre deux (MUSCL et ENO modifiées) et de différentes méthodes de traitement des frottements sur des solutions analytiques unidimensionnelles. Ces comparaisons nous permettent de choisir une méthode numérique adaptée à la simulation du ruissellement qui en outre capture les phénomènes de type roll-waves. Ensuite nous nous intéressons au traitement de la pluie et de l'infiltration à l'aide du modèle de Green-Ampt. Cette méthode généralisée en dimension deux est validée sur des résultats expérimentaux obtenus à l'INRA d'Orléans et à l'IRD. La méthode numérique choisie et validée a été implémentée dans FullSWOF_2D un logiciel libre écrit en C++ pour la simulation de ruissellement d'eau de pluie sur des surfaces agricoles.
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Gross, Richard Edward. "Numerical simulations of flux pinning". Thesis, University of Cambridge, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.243012.

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Hu, Chih-Chieh. "Mechanistic modeling of evaporating thin liquid film instability on a bwr fuel rod with parallel and cross vapor flow". Diss., Atlanta, Ga. : Georgia Institute of Technology, 2009. http://hdl.handle.net/1853/28148.

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Thesis (M. S.)--Mechanical Engineering, Georgia Institute of Technology, 2009.
Committee Chair: Abdel-Khalik, Said; Committee Member: Ammar, Mostafa H.; Committee Member: Ghiaasiaan, S. Mostafa; Committee Member: Hertel, Nolan E.; Committee Member: Liu, Yingjie.
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Tsui, Chi-Wa. "Magnetic flux reconstruction methods for shaped tokamaks". Thesis, Massachusetts Institute of Technology, 1993. http://hdl.handle.net/1721.1/12279.

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Caro, Gregory P. "Direct numerical simulations of diffusive staircases in the Arctic". Thesis, Monterey, Calif. : Naval Postgraduate School, 2009. http://edocs.nps.edu/npspubs/scholarly/theses/2009/Mar/09Mar%5FCaro.pdf.

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Thesis (M.S. in Physical Oceanography)--Naval Postgraduate School, March 2009.
Thesis Advisor(s): Radko, Timour. "March 2009." Description based on title screen as viewed on April 23, 2009. Author(s) subject terms: Double-diffusion, diffusive convection, heat flux, thermohaline staircase, Includes bibliographical references (p. 39-41). Also available in print.
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Spencer, Steven Charles. "Computer simulations of flux pinning in type II superconductors". Thesis, Imperial College London, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.338422.

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Virtanen, I. (Iiro). "Surface flux transport simulations of the photospheric magnetic field". Doctoral thesis, Oulun yliopisto, 2019. http://urn.fi/urn:isbn:9789526223292.

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Abstract This thesis studies the long-term evolution of the photospheric magnetic field using surface flux transport simulations. The photospheric magnetic field and magnetic activity are tightly connected to space weather, and affect the whole heliosphere including the Earth. However, due to a lack of reliable observations our understanding of the long-term evolution of the photospheric magnetic field is still poor. Surface flux transport models, which are capable of simulating the evolution of the whole surface field from observations of solar activity, can be used to study the field in times when direct observations are not available. In this thesis we validate our surface flux transport model, optimize its parameters and test its sensitivity to uncertainties in parameter values and input data. We find a need to extend the model with a decay term to properly model the deep and long minimum between solar cycles 23 and 24, and simulate the photospheric magnetic field of cycles 21–24 using magnetographic observations as input. We also study consequences of hemispherically asymmetric activity, and show that activity in one hemisphere is enough to maintain polar fields in both hemispheres through cross-equatorial flow of magnetic flux. We develop a new method to reconstruct active regions from calcium K line and sunspot polarity observations. We show that this reconstruction is able to accurately capture the correct axial dipole moment of active regions. We study the axial dipole moments of observed active regions and find that a significant fraction of them have a sign opposite to the sign expected from Hale’s and Joy’s laws, proving that the new reconstruction method has an advantage over existing methods that rely on Hale’s and Joy’s laws to define polarities. We show one example of a long simulation covering solar cycles 15–21, demonstrating that using the active region reconstruction and surface flux transport model presented in this thesis it is possible to simulate the large-scale evolution of the photospheric magnetic field over the past century
Original papers The original publications are not included in the electronic version of the dissertation. Virtanen, I. O. I., Virtanen, I. I., Pevtsov, A. A., Yeates, A., & Mursula, K. (2017). Reconstructing solar magnetic fields from historical observations. II. Testing the surface flux transport model. Astronomy & Astrophysics, 604, A8. https://doi.org/10.1051/0004-6361/201730415 http://jultika.oulu.fi/Record/nbnfi-fe2017103050356 Virtanen, I. O. I., Virtanen, I. I., Pevtsov, A. A., & Mursula, K. (2018). Reconstructing solar magnetic fields from historical observations. III. Activity in one hemisphere is sufficient to cause polar field reversals in both hemispheres. Astronomy & Astrophysics, 616, A134. https://doi.org/10.1051/0004-6361/201732323 http://jultika.oulu.fi/Record/nbnfi-fe201902205813 Virtanen, I. O. I., Virtanen, I. I., Pevtsov, A. A., Bertello, L., Yeates, A., & Mursula, K. (2019). Reconstructing solar magnetic fields from historical observations. IV. Testing the reconstruction method. Astronomy & Astrophysics, 627, A11. https://doi.org/10.1051/0004-6361/201935606 http://jultika.oulu.fi/Record/nbnfi-fe2019091828628 Virtanen, I. O. I., Virtanen, I. I., Pevtsov, A. A., & Mursula, K. (2019) Axial dipole moment of solar active regions in cycles 21-24. Manuscript
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Caschera, Elisabetta. "Global confinement properties in global, flux-driven, gyrokinetic simulations". Electronic Thesis or Diss., Aix-Marseille, 2019. http://www.theses.fr/2019AIXM0509.

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La compréhension du confinement du plasma dans les réacteurs à fusion est l’une des étapes manquantes pour la disponibilité de l’énergie de fusion. La conception de futurs réacteurs tels que ITER sont bases sur l'extrapolation de lois d'échelle empiriques. Dans ce travail de thèse nous étudions les propriétés globales du confinement du plasma dans un Tokamak avec l'une des simulations numériques les plus complétés. Les recherches portent sur deux sujets principaux: les propriétés d’échelle du confinement et l’effet de la limite du plasma sur le transport turbulent. Un résultat important est obtenu lors de la reproduction de la loi d’échelle globale du temps de confinement de l’énergie avec les simulations numériques. La condition aux limites du code a été modifié pour imiter cela au bord du plasma dans les expériences. Une physique supplémentaires est accessibles aux simulations, telles que l'instabilité de type Kelvin-Helmeholtz au niveau de la separatrice et la turbulence sous-critique de bord
Understanding and predicting the performance of a fusion reactor in terms of confinement is one of the missing milestones for the availability of fusion energy. The predictions for the design of future reactors such as ITER are based on the extrapolation of empiricalscaling laws. We investigate global confinement properties of turbulent heat transport in a Tokamak with first principle simulations. The research is carried on two main topics: the scaling properties of plasma confinement and the effect of the plasma boundary on the turbulent transport. An important result is obtained when reproducing the global scaling for the energy confinement time with numerical simulations. However the scaling properties are found to brake at the local level. The boundary condition of the code has been modified to mimic the experimental Scrape-Off Layer at the plasma edge. Additional physics is now accessible, such as Kelvin-Helmholtz-like instability at separatrix and edge subcritical turbulence
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Libri sul tema "Reconstruction and flux simulations"

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Probert, Matthew I. J. Computer simulations of flux line motion in high temperature superconductors. Birmingham: University of Birmingham, 1994.

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Kimball, John. BOREAS RSS-8 BIOME-BGC model simulations at tower flux sites in 1994. Greenbelt, Md: National Aeronautics and Space Administration, Goddard Space Flight Center, 2000.

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Kimball, John. BOREAS RSS-8 BIOME-BGC model simulations at tower flux sites in 1994. Greenbelt, Md: National Aeronautics and Space Administration, Goddard Space Flight Center, 2000.

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Kimball, John. BOREAS RSS-8 BIOME-BGC model simulations at tower flux sites in 1994. Greenbelt, Md: National Aeronautics and Space Administration, Goddard Space Flight Center, 2000.

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Kimball, John. BOREAS RSS-8 BIOME-BGC model simulations at tower flux sites in 1994. Greenbelt, Md: National Aeronautics and Space Administration, Goddard Space Flight Center, 2000.

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Giacomo, Richard Di. ROLE-PLAYING SIMULATIONS High School U.S. History—Reconstruction to 20th Century. 3a ed. California: Magnifico Publications, 2002.

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S, Steinolfson R., e United States. National Aeronautics and Space Administration., a cura di. Numerical simulations of mass loading in the solar wind interaction with Venus. [Washington, DC: National Aeronautics and Space Administration, 1996.

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Analysis of the ISO 9705 room/corner test: Simulations, correlations, and heat flux measurements. Gaithersburg, MD: U.S. Dept. of Commerce, Technology Administration, National Institute of Standards and Technology, 1998.

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Singer, Herman Marius. Three-dimensional reconstruction of dendritic and doublon structures, morphological transitions and comparison with computer simulations. 2004.

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Capitoli di libri sul tema "Reconstruction and flux simulations"

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Yang, Qing-Qing, Jiu Luo, Dong-Chuan Mo, Shu-Shen Lyu e Yi Heng. "Fast Reconstruction of Transient Heat-Flux Distributions in a Laser Heating Process with Time-Space Adaptive Mesh Refinement". In Computational and Experimental Simulations in Engineering, 1217–23. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-27053-7_103.

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Patnaik, Gopal, Jay P. Boris, Fernando F. Grinstein, John P. Iselin e Denise Hertwig. "Large Scale Urban Simulations with FCT". In Flux-Corrected Transport, 91–117. Dordrecht: Springer Netherlands, 2012. http://dx.doi.org/10.1007/978-94-007-4038-9_4.

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Beurton-Aimar, Marie, Tung Vu-Ngoc Nguyen e Sophie Colombié. "Metabolic Network Reconstruction and Their Topological Analysis". In Plant Metabolic Flux Analysis, 19–38. Totowa, NJ: Humana Press, 2013. http://dx.doi.org/10.1007/978-1-62703-688-7_2.

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Wei, He, Malvin Bjorøy e Elen Roaldset. "Paleoheat Flux Reconstruction from Thermal Indicators". In ACS Symposium Series, 269–85. Washington, DC: American Chemical Society, 1994. http://dx.doi.org/10.1021/bk-1994-0570.ch017.

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Ogino, Tatsuki, Raymond J. Walker e Maha Ashour-Abdalla. "Magnetic flux ropes in 3-Dimensional MHD simulations". In Physics of Magnetic Flux Ropes, 669–78. Washington, D. C.: American Geophysical Union, 1990. http://dx.doi.org/10.1029/gm058p0669.

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Risso, Dino, e Patricio Cordero. "Poiseuille Flux of Hard Particles: Theory and Simulations". In Nonlinear Phenomena and Complex Systems, 111–18. Dordrecht: Springer Netherlands, 1996. http://dx.doi.org/10.1007/978-94-009-0239-8_10.

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Linker, J. A., G. Van Hoven e D. D. Schnack. "Effects of the driving mechanism in MHD simulations of coronal mass ejections". In Physics of Magnetic Flux Ropes, 379–84. Washington, D. C.: American Geophysical Union, 1990. http://dx.doi.org/10.1029/gm058p0379.

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Switzer, Eric R., Thomas M. Crawford e Christian L. Reichardt. "Bayesian Flux Reconstruction in One and Two Bands". In Lecture Notes in Statistics, 219–24. New York, NY: Springer New York, 2012. http://dx.doi.org/10.1007/978-1-4614-3520-4_21.

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Jensen, Henrik Jeldtoft. "Simulations of Relaxation, Pinning, and Melting in Flux Lattices". In Phase Transitions and Relaxation in Systems with Competing Energy Scales, 129–85. Dordrecht: Springer Netherlands, 1993. http://dx.doi.org/10.1007/978-94-011-1908-5_8.

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Hayashi, T., M. Ozaki, H. Kitabata e T. Sato. "Computer Simulations of Twisted Flux Tubes and Magnetic Reconnection". In Astrophysics and Space Science Library, 133–36. Dordrecht: Springer Netherlands, 1998. http://dx.doi.org/10.1007/978-94-011-5220-4_21.

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Atti di convegni sul tema "Reconstruction and flux simulations"

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Öhrle, Constantin, Ulrich Schäferlein, Manuel Keßler e Ewald Krämer. "Higher-order Simulations of a Compound Helicopter using Adaptive Mesh Refinement". In Vertical Flight Society 80th Annual Forum & Technology Display, 1–19. The Vertical Flight Society, 2024. http://dx.doi.org/10.4050/f-0074-2018-12713.

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Abstract (sommario):
Higher-order methods and adaptive mesh refinement (AMR) have demonstrated their added value to numerical simulation of a variety of aerodynamic problems, including rotorcraft flow. Within this paper, the implementation of a higher-order spatial WENO (Weighted Essentially Non-Oscillatory) method for flux reconstruction and an AMR method for grid refinement into a comprehensive and approved rotorcraft simulation framework is discussed. A significant increase in computational efficiency by factor 15 can be achieved using higher-order methods. AMR allows a considerable reduction of required overall grid cells, and thus computational effort, to represent the occurring flow phenomena with equivalent accuracy. The rotorcraft simulation framework is applied to simulate a highly complex compound helicopter geometry with a variety of challenging phenomena. Flight mechanic trim and elastic blades are taken into account for a physical representation of the flight state. The benefit of the AMR technique in combination with the higher-order methods for an isolated rotor in hover and a complete helicopter configuration in cruise flight is investigated. A robust application of the AMR implementation is demonstrated, which shows a reduction of computational cost by 50% at high advance ratio cases without a noticeable loss of accuracy.
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Le Bras, Sophie, Hugues Deniau e Christophe Bogey. "A flux reconstruction technique for non-conforming grid interfaces in aeroacoustic simulations". In 22nd AIAA/CEAS Aeroacoustics Conference. Reston, Virginia: American Institute of Aeronautics and Astronautics, 2016. http://dx.doi.org/10.2514/6.2016-2972.

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Miyaji, Koji. "On the Compressible Flow Simulations with Shocks by a Flux Reconstruction Approach". In 20th AIAA Computational Fluid Dynamics Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2011. http://dx.doi.org/10.2514/6.2011-3057.

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Gnoffo, Peter. "Updates to Multi-Dimensional Flux Reconstruction for Hypersonic Simulations on Tetrahedral Grids". In 48th AIAA Aerospace Sciences Meeting Including the New Horizons Forum and Aerospace Exposition. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2010. http://dx.doi.org/10.2514/6.2010-1271.

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Lu, Yi, Kai Liu e W. N. Dawes. "Large Eddy Simulations for 3D Turbine Blades Using a High Order Flux Reconstruction Method". In ASME Turbo Expo 2013: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/gt2013-94707.

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Abstract (sommario):
During the last decades, the improvements of both computational ability and numerical schemes have stimulated increasing industrial interest in the use of Large Eddy Simulations (LES) for practical engineering flow problems. However, almost all current approches cannot treat complex geometries at affordable cost to enable LES of industrial problems. A robust, parallel and efficient solver using a general unstructured grid & based on high order flux reconstruction formulation, which uses local reconstruction, is compact and written in differential form without a mass matrix, was developed and has proved the ability to get accurate LES results but using RANS scale meshes. This work is aimed at using flux reconstruction method to perform Large Eddy Simulations for complex geometries in more robust and highly efficient way. Both explicit Runge-Kutta method and implicit LU-SGS method are implemented with improvements as solvers for better performance on boundary layer meshes including large aspect ratio cells. The current solver is ported to GPU architectures and speed up ratios of different order accuracy are presented in this work. A local reconstruction method is introduced to generate high order curved boundary from readily available first order meshes. The large eddy simulations for low pressure turbine blade and low pressure turbine blade with endwall are presented in this work, resolved with total number of degree of freedoms up to 34 million to chieve fourth order accuracy using limited computational resource. The results show that this approach has the potential to obtain LES results of real-geometry problems with affordable computational costs.
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LU, Yi, e William N. Dawes. "Large Eddy Simulations using High order Flux Reconstruction method on Hybrid Unstructured meshes". In 52nd Aerospace Sciences Meeting. Reston, Virginia: American Institute of Aeronautics and Astronautics, 2014. http://dx.doi.org/10.2514/6.2014-0424.

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Spiegel, Seth C., Michael R. Borghi e Dennis A. Yoder. "Large Eddy Simulations of a Single-Injector Cooling Flow Using the High-Order Flux Reconstruction Method". In AIAA SCITECH 2022 Forum. Reston, Virginia: American Institute of Aeronautics and Astronautics, 2022. http://dx.doi.org/10.2514/6.2022-1813.

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Lu, Yi, Xin Yuan e W. N. Dawes. "Investigation of 3D Internal Flow Using New Flux-Reconstruction High Order Method". In ASME Turbo Expo 2012: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/gt2012-69270.

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Abstract (sommario):
The new godunov-type high order method via flux-reconstruction, are capable of unifiying several popular methods including the discontinuous Galerkin, staggered-grid multi-domain method, or the spectral difference/spectral volume methods into a single family. Compared to discontinuous galerkin method, this new method retain the arbitrary order and compact properties but written in differential form and without mass matrix. The flux-reconstrcution method using general unstructured 2D/3D mesh including triangles, quadrilaterals, tetrahedrons, pyramids, prisms and hexahedrons are implemented. Compared to discontinuous galerkin method, FR is differential form without any quandature, so it runs faster and is easier to implement on GPU to achieve higher speed up ratio. The present paper investigates three different solving methods for this new method in order to cut down the hugh computational cost and memory requirement for fully implicit methods. Explicit multi-stage Runge-Kutta, nonlinear Lower-Upper Symmetry Gauss-Seidel (LU-SGS) and generalized minimal residual (GMRES) with matrix-free preconditioning methods are implemented and all these three methods use p-multigrid to smooth low-frequency errors on lower order. The results of 2D steady-state external/internal viscous flows are presented and the convergence properties for different solving method are compared. Efficiency and robustness are improved through symmetric Gauss-Seidel (SGS) iterations as preconditioning, a remarkable feature of the present GMRES+SGS method is that the storage of the full Jacobian matrix can be eliminated and only its diagonal stored. A laplacian artificial viscosity is tested to capture shock in one element and performs well for this new high order method, an L2 projection method is used to improve the perfomance of aliasing error in conservative form. The one equation Spalart-Allmaras turbulence model is unsed to solve the Raynolds average navier-stokes equations. MPI is used for parallel simulations for ralatively complex 3D internal flow when using high order method. Compared to other high order methods, results in this paper show that Flux-Reconstruction methods with efficient solving method performs well for 2D/3D general unstructured mesh in wide range of reynorlds number, and is also potential for “real geometry” simulations.
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Poe, Nicole M. W., e D. Keith Walters. "A Non-Local Convective Flux Limiter for Upwind-Biased Finite Volume Simulations". In ASME 2010 3rd Joint US-European Fluids Engineering Summer Meeting collocated with 8th International Conference on Nanochannels, Microchannels, and Minichannels. ASMEDC, 2010. http://dx.doi.org/10.1115/fedsm-icnmm2010-30752.

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Abstract (sommario):
Finite volume methods on structured and unstructured meshes often utilize second-order, upwind-biased linear reconstruction schemes to approximate the convective terms, in an attempt to improve accuracy over first-order methods. Limiters are employed to reduce the inherent variable over- and under-shoot of these schemes; however, they also can significantly increase the numerical dissipation of a solution. This paper presents a novel non-local, non-monotonic (NLNM) limiter developed by enforcing cell minima and maxima on dependent variable values projected to cell faces. The minimum and maximum values for a cell are determined primarily through the recursive reference to the minimum and maximum values of its upwind neighbors. The new limiter is implemented using the User Defined Function capability available in the commercial CFD solver Ansys FLUENT. Various simple test cases are presented which exhibit the NLNM limiter’s ability to eliminate non-physical oscillations while maintaining relatively low dissipation of the solution. Results from the new limiter are compared with those from other limited and unlimited second-order upwind (SOU) and first-order upwind (FOU) schemes. For the cases examined in the study, the NLNM limiter was found to improve accuracy without significantly increasing solution convergence rate.
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Poe, Nicole M. W., D. Keith Walters, Edward A. Luke e Christopher I. Morris. "A Low-Dissipation Second-Order Upwind Flux Formulation for Simulation of Complex Turbulent Flows". In ASME 2015 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/imece2015-53725.

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A numerical method is presented for low-dissipation, high-resolution finite-volume CFD simulations of turbulent flow. The convective fluxes in the governing equations are computed using a conventional upwind-biased second order scheme, with a modified linear reconstruction of face states from neighboring cells. The new scheme, dubbed optimization-based gradient reconstruction (OGRE), incorporates two key enhancements to improve performance. The first is an iterative least-square gradient computation procedure which minimizes the second-order dissipative error contribution to the face reconstruction on structured Cartesian meshes. The second is a slope limiting scheme which enforces local monotonicity near discontinuities without the detrimental effect of limiting in smooth regions of the flowfield. In addition, for density-based methods employing flux-difference splitting for the convective terms, a recently proposed weighted-average for obtaining the reconstructed face variable values is used, which improves accuracy in subsonic flow regions and eliminates the need for preconditioning. The new method has been implemented into the Ansys FLUENT and Loci-CHEM flow solvers, and is validated for several test cases by comparison to a conventional linear reconstruction implementation. Results clearly show the advantage of the new scheme over conventional upwind-biased second order schemes in terms of accuracy, particularly with regard to LES/DNS simulation. The most significant improvement is obtained for Cartesian meshes and low Mach number flows, but all test cases showed some level of improvement using the new scheme. The method is also quantified in terms of increased computational cost versus traditional methods. Based on results shown here, the method appears to represent a viable alternative to currently used centered and blended schemes in terms of accuracy, robustness, and computational expense.
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Rapporti di organizzazioni sul tema "Reconstruction and flux simulations"

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DiDomizio, Matthew, e Jonathan Butta. Measurement of Heat Transfer and Fire Damage Patterns on Walls for Fire Model Validation. UL Research Institutes, luglio 2024. http://dx.doi.org/10.54206/102376/hnkr9109.

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Abstract (sommario):
Fire models are presently employed by fire investigators to make predictions of fire dynamics within structures. Predictions include the evolution of gas temperatures and velocities, smoke movement, fire growth and spread, and thermal exposures to surrounding objects, such as walls. Heat flux varies spatially over exposed walls based on the complex thermal interactions within the fire environment, and is the driving factor for thermally induced fire damage. A fire model predicts the temperature and heat transfer through walls based on field predictions, such as radiative and convective heat flux, and is also subject to the boundary condition represen-tation, which is at the discretion of model practitioners. At the time of writing, Fire Dynamics Simulator can represent in-depth heat transfer through walls, and transverse heat transfer is in a preliminary development stage. Critically, limited suitable data exists for validation of heat trans-fer through walls exposed to fires. Mass loss and discoloration fire effects are directly related to the heat transfer and thermal decomposition of walls, therefore it is crucial that the representation of transverse heat transfer in walls in fire models be validated to ensure that fire investigators can produce accurate simulations and reconstructions with these tools. The purpose of this study was to conduct a series of experiments to obtain data that addresses three validation spaces: 1) thermal exposure to walls from fires; 2) heat transfer within walls exposed to fires; and 3) fire damage patterns arising on walls exposed to fires. Fire Safety Research Institute, part of UL Research Institutes, in collaboration with the Bureau of Alcohol, Tobacco, Firearms and Explosives Fire Research Laboratory, led this novel research endeavor. Experiments were performed on three types of walls to address the needs in this validation space: 1. Steel sheet (304 stainless steel, 0.793 mm thick, coated in high-emissivity high-temperature paint on both sides). This wall type was used to support the heat flux validation objective. By combining measurements of gas temperatures near the wall with surface temperatures obtained using infrared thermography, estimates of the incident heat flux to the wall were produced. 2. Calcium silicate board (BNZ Marinite I, 12.7 mm thick). This wall type was used to support the heat transfer validation objective. Since calcium silicate board is a noncombustible material with well-characterized thermophysical properties at elevated temperatures, measurements of surface temperature may be used to validate transverse heat transfer in a fire model without the need to account for a decomposition mechanism. 3. Gypsum wallboard (USG Sheetrock Ultralight, 12.7 mm thick, coated in white latex paint on the exposed side). This wall type was used to support the fire damage patterns validation objective. Two types of fire effects were considered: 1) discoloration and charring of the painted paper facing of the gypsum wallboard; and 2) mass loss of the gypsum wallboard (which is related to the calcination of the core material). In addition to temperature and heat flux measurements, high resolution photographs of fire patterns were recorded, and mass loss over the entirety of the wall was measured by cutting the wall into smaller samples and measuring the mass of each individual sample. A total of 63 experiments were conducted, encompassing seven fire sources and three wall types (each combination conducted in triplicate). Fire sources included a natural gas burner, gasoline and heptane pools, wood cribs, and upholstered furniture. A methodology was developed for obtaining estimates of field heat flux to a wall using a large plate heat flux sensor. This included a numerical optimization scheme to account for convection heat transfer. These data characterized the incident heat flux received by calcium silicate board and gypsum wallboard in subsequent experiments. Fire damage patterns on the gypsum wallboard, attributed to discoloration and mass loss fire effects, were measured. It was found that heat flux and mass loss fields were similar for a given fire type, but the relationship between these measurements was not consistent across all fire types. Therefore, it was concluded that cumulative heat flux does not adequately describe the mass loss fire effect. Fire damage patterns attributed to the discoloration fire effect were defined as the line of demarcation separating charred and uncharred regions of the wall. It was found that the average values of cumulative heat flux and mass loss ratio coinciding with the fire damage patterns were 10.41 ± 1.51 MJ m−2 and 14.86 ± 2.08 %, respectively. These damage metrics may have utility in predicting char delineation damage patterns in gypsum wallboard using a fire model, with the mass loss ratio metric being overall the best fit over all exposures considered. The dataset produced in this study has been published to a public repository, and may be accessed from the following URL: <https://doi.org/10.5281/zenodo.10543089>.
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Martz, H. E., M. B. Aufderheide, D. Goodman, A. Schach von Wittenau, C. Logan, J. Hall, J. Jackson e D. Slone. Quantitative tomography simulations and reconstruction algorithms. Office of Scientific and Technical Information (OSTI), novembre 2000. http://dx.doi.org/10.2172/15005122.

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Tsui, Chi-Wa. Magnetic flux reconstruction methods for shaped tokamaks. Office of Scientific and Technical Information (OSTI), dicembre 1993. http://dx.doi.org/10.2172/10117754.

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Aufderheide, M. B., H. E. Martz, D. M. Slone, J. A. Jackson, A. E. Schach von Wittenau, D. M. Goodman, C. M. Logan e J. M. Hall. Concluding Report: Quantitative Tomography Simulations and Reconstruction Algorithms. Office of Scientific and Technical Information (OSTI), febbraio 2002. http://dx.doi.org/10.2172/15002511.

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Carrigan, Charles R., Yunwei Sun e Matthew D. Simpson. Noble Gas Surface Flux Simulations And Atmospheric Transport. Office of Scientific and Technical Information (OSTI), settembre 2017. http://dx.doi.org/10.2172/1404844.

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Monnig, C. A., K. A. Marshall, G. D. Rayson e G. M. Hieftje. Tomographic Image Reconstruction Techniques for Spectroscopic Sources: Theory and Computer Simulations. Fort Belvoir, VA: Defense Technical Information Center, luglio 1988. http://dx.doi.org/10.21236/ada198213.

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Ilas, Germina, David Chandler, Brian J. Ade, Eva E. Sunny, Benjamin R. Betzler e Daniel Pinkston. Modeling and Simulations for the High Flux Isotope Reactor Cycle 400. Office of Scientific and Technical Information (OSTI), marzo 2015. http://dx.doi.org/10.2172/1185903.

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Ridel, Melissa. Reconstruction du Flux d'Energie et Recherche de Squarks et Gluinos dans l'Experience D0. Office of Scientific and Technical Information (OSTI), gennaio 2002. http://dx.doi.org/10.2172/1420957.

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Latini, M., O. Schilling e W. Don. Effects of WENO flux reconstruction order and spatial resolution on reshocked two-dimensional Richtmyer-Meshkov instability. Office of Scientific and Technical Information (OSTI), marzo 2006. http://dx.doi.org/10.2172/883610.

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Chandler, David, e Jorge Navarro. Reactor Physics Simulations of the High Flux Isotope Reactor Permanent Beryllium Reflector Number 5. Office of Scientific and Technical Information (OSTI), luglio 2022. http://dx.doi.org/10.2172/1876305.

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