Relevant bibliographies by topics / Formulation implicite

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Formulation implicite'

Author: Grafiati
Published: 4 June 2021
Last updated: 13 February 2022

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Journal articles on the topic "Formulation implicite"

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MACDONALD, Roderick A. "Pour la reconnaissance d’une normativité juridique implicite et « inférentielle »." Sociologie et sociétés 18, no. 1 (September 30, 2002): 47–58. http://dx.doi.org/10.7202/001460ar.

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Résumé L'auteur s'interroge sur l'importance des normes non formalisées dans les systèmes normatifs institutionnalisés. Il conteste l'approche réductrice du positivisme institutionnel, qui distingue le droit du non juridique par le critère de la source et qui privilégie en fait un modèle particulier de norme: la proposition formalisée émanant d'un organe législatif. L'auteur propose plutôt une typologie combinant le mode d'élaboration des normes et la manière dont on en extrait la signification. Dans cette optique plus sociologique, la question de la source du droit devient un problème d'argument et la fonction d'une norme n'apparaît plus fondamentalement affectée par sa formulation explicite dans une loi. S'il est vrai que la naissance d'institutions spécifiquement chargées d'appliquer la loi oriente la recherche normative vers les normes explicites formulées par ces institutions, il reste que, d'un point de vue dynamique, seules les nonnes implicites et "inférentielles" sont réellement normatives.
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Gaudreau, Louis. "Espace, temps et théorie du capital chez Henri Lefebvre et Marx." Cahiers de recherche sociologique, no. 55 (December 3, 2014): 155–76. http://dx.doi.org/10.7202/1027685ar.

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Ce texte propose une réflexion sur la production capitaliste de l’espace. Il présente la théorie d’Henri Lefebvre sur l’espace et tente de mettre en lumière la contribution originale de cet auteur à la compréhension du rapport entre temps et espace dans la reproduction du capitalisme. L’analyse porte plus particulièrement sur le concept d’espace abstrait développé par Lefebvre, dont on retrouve une formulation implicite dans les travaux de Marx, et qui révèle le rôle actif joué par la spatialité dans le procès de valorisation capitaliste. Le concept lefebvrien d’espace abstrait jette ainsi les bases d’une remise en question du primat accordé au temps dans la tradition d’analyse critique du capitalisme. Le texte se conclut par de brèves réflexions sur l’actualité d’une telle conception de l’espace pour saisir la récente financiarisation du capital.
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Hurley, Robert. "De la violence divine à l’obéissance esclave, le Père et le Fils renoncent au pouvoir en Ph 2." Dossier 67, no. 1 (August 9, 2011): 87–110. http://dx.doi.org/10.7202/1005568ar.

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L’acte de kénose décrit dans le Carmen Christi (Ph 2,6-11) a été maintes fois et correctement présenté comme une attitude ou une disposition spirituelle assumée par Jésus Christ quand il a accepté de mourir plutôt que d’avoir recours à la violence. De ces exégètes qui ont récemment attiré l’attention sur le caractère politique du langage de l’hymne, au moins deux (Oakes en 2005 et Heen, en 2004) détectent dans sa formulation une critique implicite du pouvoir violent qui fondait et soutenait l’Empire romain. L’auteur du présent article s’inscrit sur cette même trajectoire : il propose une interprétation de Ph 2,6-11 comme l’expression de la théopolitique qui informait la vie commune des ekklēsiai qui déclaraient que Jésus était seigneur. Dans ce passage, l’Église naissante projette une utopie féconde qui prévoit pour le faible un monde formé à l’image de celui qui renonçait aux honneurs divins si convoités de l’élite romaine. Tout en reconnaissant les implications politiques (sociales et matérielles) du message symbolique véhiculé en Ph 2, l’auteur soutient que l’Église qui chantait cet hymne devait voir son destin non seulement dans un monde (terrestre) plus juste, mais ultimement dans un royaume céleste où le Christ régnerait comme un seigneur au service de tous.
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Gardner, David J., Jorge E. Guerra, François P. Hamon, Daniel R. Reynolds, Paul A. Ullrich, and Carol S. Woodward. "Implicit–explicit (IMEX) Runge–Kutta methods for non-hydrostatic atmospheric models." Geoscientific Model Development 11, no. 4 (April 17, 2018): 1497–515. http://dx.doi.org/10.5194/gmd-11-1497-2018.

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Abstract. The efficient simulation of non-hydrostatic atmospheric dynamics requires time integration methods capable of overcoming the explicit stability constraints on time step size arising from acoustic waves. In this work, we investigate various implicit–explicit (IMEX) additive Runge–Kutta (ARK) methods for evolving acoustic waves implicitly to enable larger time step sizes in a global non-hydrostatic atmospheric model. The IMEX formulations considered include horizontally explicit – vertically implicit (HEVI) approaches as well as splittings that treat some horizontal dynamics implicitly. In each case, the impact of solving nonlinear systems in each implicit ARK stage in a linearly implicit fashion is also explored.The accuracy and efficiency of the IMEX splittings, ARK methods, and solver options are evaluated on a gravity wave and baroclinic wave test case. HEVI splittings that treat some vertical dynamics explicitly do not show a benefit in solution quality or run time over the most implicit HEVI formulation. While splittings that implicitly evolve some horizontal dynamics increase the maximum stable step size of a method, the gains are insufficient to overcome the additional cost of solving a globally coupled system. Solving implicit stage systems in a linearly implicit manner limits the solver cost but this is offset by a reduction in step size to achieve the desired accuracy for some methods. Overall, the third-order ARS343 and ARK324 methods performed the best, followed by the second-order ARS232 and ARK232 methods.
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Kanno, Yoshihiro. "AN IMPLICIT FORMULATION OF MATHEMATICAL PROGRAM WITH COMPLEMENTARITY CONSTRAINTS FOR APPLICATION TO ROBUST STRUCTURAL OPTIMIZATION." Journal of the Operations Research Society of Japan 54, no. 2-3 (2011): 65–85. http://dx.doi.org/10.15807/jorsj.54.65.

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Moosavian, Naser. "Pipe network modeling for analysis of flow in porous media." Canadian Journal of Civil Engineering 46, no. 12 (December 2019): 1151–59. http://dx.doi.org/10.1139/cjce-2018-0786.

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In this paper, a new matrix framework has been developed for the simulation of flow and pressure in porous media. In this framework, the pressure gradient formulation in Darcy’s law is considered as the head-loss equation in pipe network modeling. Then, an artificial pipe network has been constructed to find the pressure head profile in porous media. Two explicit and implicit formulations have been advanced for linear and nonlinear analysis, which the latter is an implementation of the Newton–Raphson algorithm. Both formulations iteratively solve a linear system of equations for calculating the nodal heads and apply a matrix multiplication for updating the flow vector. While the explicit method needs few iterations, the implicit method requires at least 20 iterations to converge with acceptable accuracy. For testing these formulations, four different types of network configurations were tested. The analysis of three laboratory tests showed that the application of the implicit method provides reliable and accurate results.
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GRAO, Frédéric, and Nicole RAMOGNINO. "Les matérialités sociales et leurs observations." Sociologie et sociétés 29, no. 2 (September 30, 2002): 103–19. http://dx.doi.org/10.7202/001309ar.

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Résumé La réception de Maurice Halbwachs peut être explicite dans les publications diverses ou encore dans des programmes de recherche en cours, et implicite dans des travaux de recherche publiés. Notre réception de l'œuvre est d'abord méthodique, alors même, comme nous le pensons, que ces considérations peuvent déplacer, élargir ou gauchir (selon le point de vue) le cadre de la théorie sociale. Les travaux de Maurice Halbwachs nous ont intéressés par leurs entrées méthodiques dans l'appréhension du social, ce que nous appelons les " matérialités du social " : espace, temps et information des faits sociaux dont la matérialité observable est essentiellement le langage. Ces " matérialités " relèvent d'une morphologie sociale, si l'on donne à ce terme son sens premier de délimitation de la forme des phénomènes sociaux qui permet et conditionne les opérations de découpage de discontinuités visibles dans la continuité du mouvement de la vie sociale, opérations que le sociologue effectue explicitement ou implicitement pour pouvoir envisager la description du social. Ces entrées ne sont pas spécifiques à la sociologie et demandent une construction sociologique. À cet égard, M. Halbwachs ouvre la voie en modalisant ces entrées selon le point de vue du groupe social : l'on peut voir, notamment lorsqu'il analyse la mémoire individuelle, à quel point le recours à la notion de groupe social lui apparaît pertinente et, lorsqu'il analyse les statistiques, l'approche relationnelle qu'il en fait. Nous avons voulu montrer la fécondité de cette approche méthodique, notamment en sociologie urbaine à partir de l'entrée spatio-temporelle, et pour ce faire, nous avons utilisé les travaux de G. Granai sur le développement de la ville d'Aix-en-Provence. Pour la troisième entrée que nous présentons, la matérialité langagière, nous avons sélectionné les recherches que nous menons dans le domaine de la sociologie de la réception littéraire, ceci autour d'une discussion sur la notion de " lecteur virtuel ", développée et déclinée de différentes manières depuis sa formulation par Gérard Genette, et d'un programme de recherche en cours sur la réception de la littérature de science-fiction.
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Benson, David J. "An implicit multi-material Eulerian formulation." International Journal for Numerical Methods in Engineering 48, no. 4 (June 10, 2000): 475–99. http://dx.doi.org/10.1002/(sici)1097-0207(20000610)48:4<475::aid-nme881>3.0.co;2-u.

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Bertei, Antonio, Andrea Lamorgese, and Roberto Mauri. "Constitutive Relations of Thermal and Mass Diffusion." Journal of Non-Equilibrium Thermodynamics 45, no. 1 (January 28, 2020): 27–38. http://dx.doi.org/10.1515/jnet-2019-0055.

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AbstractNon-equilibrium thermodynamics provides a general framework for the description of mass and thermal diffusion, thereby including also cross-thermal and material diffusion effects, which are generally modeled through the Onsager coupling terms within the constitutive equations relating heat and mass flux to the gradients of temperature and chemical potential. These so-called Soret and Dufour coefficients are not uniquely defined, though, as they can be derived by adopting one of the several constitutive relations satisfying the principles of non-equilibrium thermodynamics. Therefore, mass diffusion induced by a temperature gradient and heat conduction induced by a composition gradient can be implicitly, and unexpectedly, predicted even in the absence of coupling terms. This study presents a critical analysis of different formulations of the constitutive relations, with special focus on regular binary mixtures. It is shown that, among the different formulations presented, the one which adopts the chemical potential gradient at constant temperature as the driving force for mass diffusion allows for the implicit thermo-diffusion effect to be strictly absent while the resulting Dufour effect is negligibly small. Such a formulation must be preferred to the other ones since cross-coupling effects are predicted only if explicitly introduced via Onsager coupling coefficients.
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BOFFI, DANIELE, LUCIA GASTALDI, and LUCA HELTAI. "NUMERICAL STABILITY OF THE FINITE ELEMENT IMMERSED BOUNDARY METHOD." Mathematical Models and Methods in Applied Sciences 17, no. 10 (October 2007): 1479–505. http://dx.doi.org/10.1142/s0218202507002352.

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The immersed boundary method is both a mathematical formulation and a numerical method. In its continuous version it is a fully nonlinearly coupled formulation for the study of fluid structure interactions. Many numerical methods have been introduced to reduce the difficulties related to the nonlinear coupling between the structure and the fluid evolution. However numerical instabilities arise when explicit or semi-implicit methods are considered. In this work we present a stability analysis based on energy estimates of the variational formulation of the immersed boundary method. A two-dimensional incompressible fluid and a boundary in the form of a simple closed curve are considered. We use a linearization of the Navier–Stokes equations and a linear elasticity model to prove the unconditional stability of the fully implicit discretization, achieved with the use of a backward Euler method for both the fluid and the structure evolution, and a CFL condition for the semi-implicit method where the fluid terms are treated implicitly while the structure is treated explicitly. We present some numerical tests that show good accordance between the observed stability behavior and the one predicted by our results.
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Dissertations / Theses on the topic "Formulation implicite"

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Ledez, David. "Modélisation d'objets naturels par formulation implicite." Vandoeuvre-les-Nancy, INPL, 2003. http://www.theses.fr/2003INPL073N.

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Étant donnés des nuages de points issus de l'interprétation sismique, il existe principalement deux représentations possibles des surfaces: les modèles explicites et implicites. La première famille considère' une surface comme un ensemble de polynômes (BSplines) ou de primitives géométriques (triangles). Les surfaces implicites représentent l'objet comme une isovaleur k d'une fonction scalaire, où le choix de k est arbitraire. En géomodélisation, l'approche la plus courante consiste à représenter les surfaces par des maillages triangulés. Cependant, ce choix ne se révèle pas toujours judicieux dans le cas de corps géologiques aux formes complexes, tels les dômes ou les bulles de sel. . Notre objectif est donc d'étudier et de développer une technologie de type implicite capable de reconstruire de manière automatique des objets géologiques aux formes complexes à partir d'ensembles de points.
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Colas, Clément. "Formulation intégrale implicite pour la modélisation d'écoulements fluides en milieu encombré." Thesis, Aix-Marseille, 2019. http://www.theses.fr/2019AIXM0555.

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Le sujet de cette thèse est la modélisation d’écoulements fluides dans des milieux encombrés d’obstacles solides. L’objectif est de proposer une approche intégrale pour la simulation numérique des écoulements dans les composants des circuits thermohydrauliques d’un réacteur nucléaire. Cette approche englobe les échelles de représentation locale et « composant », et assure, par construction, la continuité entre ces deux échelles. Elle repose sur une formulation intégrale multidimensionnelle des équations de la mécanique des fluides qui dégénère naturellement vers l'approche fluide standard de la mécanique des fluides . Sa discrétisation est réalisée avec un schéma numérique aux volumes finis collocalisé en espace et semi-implicite en temps utilisant une méthode de correction de pression. Le schéma numérique est adaptées aux écoulements faiblement compressibles et assure la positivité de la masse volumique et de l'énergie interne au niveau discret. Plusieurs cas tests numériques instationnaires ou stationnaires sont traités et montrent la capacité de l'approche intégrale à gérer des écoulements encombrés de tubes axiaux ou transverses à la direction de l'écoulement
The thesis issue is the modelling of fluid flows in congsted media by solid obstacles. The purpose is to design an integral approach reconciling the local and the component global scale for the numerical simulation of the coolant flow in the nuclear reactor components. The approcah affords the advantage of embedding the local and "component" representation scales in the same formalism, in ensuring the coherence between the two scales. This technique consists of a multidimensional integral formulation of the fluid flow governing equations allowing to naturally recover the CFD (Computational Fluid Dynamics) standard fluid approach when refining the mesh. The discretization is based on a time-implicit collocated finite volume numerical scheme using a pressure-correction algorithm. The scheme is relevant for weakly compressilbe flows and preserves the positivity of both the density and the internal energy, at the discrete level. Numerous unsteady or steady numerical tests are carried out and show the integral approach ability to simulate channel flows congested by axial or transversal rods
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Renaudeau, Julien. "Continuous formulation of implicit structural modeling discretized with mesh reduction methods." Thesis, Université de Lorraine, 2019. http://www.theses.fr/2019LORR0075/document.

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La modélisation structurale consiste à approximer les structures géologiques du sous-sol en un modèle numérique afin d'en visualiser la géométrie et d'y effectuer des calculs d'estimation et de prédiction. L'approche implicite de la modélisation structurale utilise des données de terrain interprétées pour construire une fonction volumétrique sur le domaine d'étude qui représente la géologie. Cette fonction doit honorer les observations, interpoler entre ces dernières, et extrapoler dans les zones sous-échantillonnées tout en respectant les concepts géologiques. Les méthodes actuelles portent cette interpolation soit sur les données, soit sur un maillage. Ensuite, le problème de modélisation est posé selon la discrétisation choisie : par krigeage dual sur les points de donnée ou en définissant un critère de rugosité sur les éléments du maillage. Dans cette thèse, nous proposons une formulation continue de la modélisation structurale par méthodes implicites. Cette dernière consiste à minimiser une somme de fonctionnelles arbitraires. Les contraintes de donnée sont imposées avec des fonctionnelles discrètes, et l'interpolation est contrôlée par des fonctionnelles continues. Cette approche permet de (i) développer des liens entre les méthodes existantes, (ii) suggérer de nouvelles discrétisations d'un même problème de modélisation, et (iii) modifier le problème de modélisation pour mieux honorer certains cas géologiques sans dépendre de la discrétisation. Nous portons également une attention particulière à la gestion des discontinuités telles que les failles et les discordances. Les méthodes existantes nécessitent soit la création de zones volumétriques avec des géométries complexes, soit la génération d'un maillage volumétrique dont les éléments sont conformes aux surfaces de discontinuité. Nous montrons, en explorant des méthodes sans maillage locales et des concepts de réduction de maillage, qu'il est possible d'assurer l'interpolation des structures tout en réduisant les contraintes liées à la gestion des discontinuités. Deux discrétisations de notre problème de minimisation sont suggérées : l'une utilise les moindres carrés glissants avec des critères optiques pour la gestion des discontinuités, et l'autre utilise des fonctions issues de la méthode des éléments finis avec le concept de nœuds fantômes pour les discontinuités. Une étude de sensibilité et une comparaison des deux méthodes sont proposées en 2D, ainsi que quelques exemples en 3D. Les méthodes développées dans cette thèse ont un grand impact en termes d'efficacité numérique et de gestion de cas géologiques complexes. Par exemple, il est montré que notre problème de minimisation au sens large apporte plusieurs solutions pour la gestion de cas de plis sous-échantillonnés et de variations d'épaisseur dans les couches stratigraphiques. D'autres applications sont également présentées tels que la modélisation d'enveloppe de sel et la restauration mécanique
Implicit structural modeling consists in approximating geological structures into a numerical model for visualization, estimations, and predictions. It uses numerical data interpreted from the field to construct a volumetric function on the domain of study that represents the geology. The function must fit the observations, interpolate in between, and extrapolate where data are missing while honoring the geological concepts. Current methods support this interpolation either with the data themselves or using a mesh. Then, the modeling problem is posed depending on these discretizations: performing a dual kriging between data points or defining a roughness criterion on the mesh elements. In this thesis, we propose a continuous formulation of implicit structural modeling as a minimization of a sum of generic functionals. The data constraints are enforced by discrete functionals, and the interpolation is controlled by continuous functionals. This approach enables to (i) develop links between the existing methods, (ii) suggest new discretizations of the same modeling problem, and (iii) modify the minimization problem to fit specific geological issues without any dependency on the discretization. Another focus of this thesis is the efficient handling of discontinuities, such as faults and unconformities. Existing methods require either to define volumetric zones with complex geometries, or to mesh volumes with conformal elements to the discontinuity surfaces. We show, by investigating local meshless functions and mesh reduction concepts, that it is possible to reduce the constraints related to the discontinuities while performing the interpolation. Two discretizations of the minimization problem are then suggested: one using the moving least squares functions with optic criteria to handle discontinuities, and the other using the finite element method functions with the concept of ghost nodes for the discontinuities. A sensitivity analysis and a comparison study of both methods are performed in 2D, with some examples in 3D. The developed methods in this thesis prove to have a great impact on computational efficiency and on handling complex geological settings. For instance, it is shown that the minimization problem provides the means to manage under-sampled fold structures and thickness variations in the layers. Other applications are also presented such as salt envelope surface modeling and mechanical restoration
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Teodorescu, Mihaela. "Application d'une formulation explicite en vitesse à la modélisation numérique du forgeage." Phd thesis, École Nationale Supérieure des Mines de Paris, 2002. http://tel.archives-ouvertes.fr/tel-00274705.

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Ce travail apporte une contribution à la modélisation numérique du forgeage à chaud à grande vitesse. Dans ce cadre, une formulation dynamique partiellement explicite en accélération/pression est proposée. Tout d'abord, plusieurs formulations implicites vitesse/pression (quasi-statique et dynamique) sont présentées et discutées. Leur solution est considérée comme référence par la suite. La formulation dynamique partiellement explicite est ensuite présentée dans le contexte viscoplastique. La vitesse courante étant supposée connue, le traitement du comportement non-linéaire du matériau est évité. Ainsi, le système associé au problème est linéaire. La discrétisation éléments finis est basée sur le mini-élément P1 + /P1. Son application à une approche dynamique mixte accélération/pression est examinée et quelques approximations sont effectuées afin de simplifier la formulation. Cette nouvelle approche a été implémentée avec succès dans une version du code FORGE2. Des comparaisons avec les approches implicites de référence ont été réalisées pour des tests de traction et de compression et prouvent la pertinence de notre approche. Une amélioration concernant la perte de volume est constatée. De plus, une réduction du CPU d'au moins 20% est obtenue lorsque le même pas de temps est utilisé dans les cas implicite et partiellement explicite. La procédure est généralisée au cas élasto-viscoplastique. Afin de simplifier la résolution du problème, une nouvelle stratégie est explorée. Elle consiste à résoudre un système linéaire uniquement en pression. L'accélération est calculée ensuite explicitement en fonction de la pression. Les estimations réalisées nous font envisager des gains significatifs de temps de calcul en 2D et en 3D. La formulation partiellement explicite proposée représente donc une alternative pour la simulation du forgeage à chaud.
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Pelissou, Céline. "Discrétisation spatio-temporelle du problème thermique à deux champs : application au procédé de forgeage à chaud." Phd thesis, École Nationale Supérieure des Mines de Paris, 2005. http://pastel.archives-ouvertes.fr/pastel-00001503.

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La prise en compte de la thermique couplée au modèle mécanique continue à poser des défis à la modélisation numérique, et plus particulièrement lors de la simulation du procédé de forgeage à chaud (déformations importantes de la pièce chaude au contact d'outils plus froids). Cette thématique d'actualité encore peu ou mal traitée dans les codes de calculs classiques (présence de problèmes de stabilité et de convergence dus aux fortes non linéarités des modèles thermomécaniques) nous amène à mettre au point une méthodologie numérique satisfaisante de l'équilibre thermique en vue de simuler un tel couplage, avec un bon compromis entre la précision de l'estimation du champ de température et le temps de résolution. Ainsi, trois modèles numériques sont introduits et intégrés dans le code éléments finis Forge 3 tous basés sur une formulation mixte à deux champs en température/flux de chaleur pour décrire le problème thermique instationnaire. - Deux modèles basés sur la méthode de Galerkin Discontinue et l'élément fini constant P0 sont d'abord présentés: # le schéma explicite Taylor Galerkin Discontinu (TGD) associé à des éléments finis mixtes discontinus P0/P0 et à un développement de Taylor explicite, le modèle Galerkin Discontinu Implicite (GDIMP), notre première méthode qui est une amélioration du schéma TGD avec une formulation plus précise pour l'estimation du flux (éléments finis mixtes P0/P+0 ) et une convergence plus rapide (schéma d'Euler implicite). - Notre nouvelle formulation, la formulation Mixte continue basée sur l'élément fini mixte linéaire P1/P1 et sur un schéma temporel implicite. Tout au long de ce travail, ces méthodes numériques sont décrites, évaluées, validées (solutions analytiques ou résultats expérimentaux) comparées et soumises à des discussions critiques quant à leur efficacité et leur robustesse.
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Peer, Andreas [Verfasser], and Matthias [Akademischer Betreuer] Teschner. "Implicit SPH formulations for viscous fluids and elastic solids." Freiburg : Universität, 2019. http://d-nb.info/1188195956/34.

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Allievi, Alejandro. "On nonlinear free surface potential flow by a Bubnov-Galerkin formulation in space and a semi-lagrangian semi-implicit scheme in time." Thesis, University of British Columbia, 1993. http://hdl.handle.net/2429/41452.

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The potential flow initial-boundary value problem describing fluid-structure interaction with fully nonlinear free surface boundary conditions has been studied using a mixed Lagrangian-Eulerian formulation. The boundary-value problem has been solved in the physical domain by means of a Bubnov-Galerkin formulation of the Laplace equation. The initialvalue problem related to the behavior of some of the moving boundaries has been discretized using various numerical techniques. Among these is a series of predictor-corrector methods. These methodologies proved to require considerable numerical smoothing to maintain stability of the numerical scheme. In turn, dissipation led to inaccuracies in the solution of the problem. In order to avoid this negative effect, a semi-implicit semi-Lagrangian two-time level iterative scheme that is almost free from smoothing has been developed. A Bubnov-Galerkin formulation of an elliptic system for the generation of boundary fitted curvilinear coordinates has been used. When solved iteratively, this method provides orthogonal meshes of very good characteristics for both symmetric and non-symmetric domains. Previous publications concluded that the present system was inadequate for non-symmetric regions leading to lack of convergence in the iterative process. Solutions described in this work show that this limitation has been overcome. Fluid responses to periodic excitation of surface-piercing and submerged bodies have been calculated. Both linear and nonlinear cases show agreement with published results. Very low total energy/work error has been obtained which demonstrates accuracy, good stability and convergence characteristics of the numerical scheme. The impulsive response of tanks of various shapes has also been simulated. Resulting natural frequencies show good agreement with available data. A slender body representation of the flow around a hull advancing with forward speed in otherwise calm water has also been simulated. Numerical calculations of a number of quantities of engineering interest are presented for different length Froude numbers. Results compare favorably with experimental data.
Applied Science, Faculty of
Mechanical Engineering, Department of
Graduate
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Onay, Oguz Kaan. "Approximate Factorization Using Acdi Method On Hybrid Grids And Parallelization Of The Scheme." Master's thesis, METU, 2013. http://etd.lib.metu.edu.tr/upload/12615589/index.pdf.

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In this thesis study, a fast implicit iteration scheme called Alternating Cell Directions Imp licit method is combined with Approximate Factorization scheme. This application aims to offer a mathematically well defined version of the Alternating Cell Directions Implicit Method and increase the accuracy of the iteration scheme that is being used for the numerical solutions of the partial differential equations. The iteration scheme presented here is tested using unsteady diffusion equation, Laplace equation and advection-diffusion equation. The accuracy, convergence character and the stability character of the scheme compared with suitable iteration schemes for structured and unstructured quadrilateral grids. Besides, it is shown that the proposed scheme is applicable to triangular and hybrid polygonal grids. A transonic full potential solver is generated using the current scheme. The flow around a 2-D cylinder is solved for subcritical and supercritical cases. Axi-symmetric flow around cylinder is selected as a benchmark problem since the potential flow around bodies with a blunt leading edge is a more challenging problem than slender bodies. Besides, it is shown that, the method is naturally appropriate for parallelization using shared memory approach without using domain decomposition applications. The parallelization that is performed here is partially line, partially point parallelization. T he performance of the application is presented for a 3-D unsteady diffusion problem using Cartesian cells and 2-D unsteady diffusion problem using both structured and unstructured quadrilateral cells.
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Zhao, Song. "Explicit and implicit large eddy simulation of turbulent combustion with multi-scale forcing." Thesis, Orléans, 2016. http://www.theses.fr/2016ORLE2023/document.

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Le contexte de cette étude est l’optimisation de la combustion turbulente prémélangée de syngaz pour la production propre d’énergie. Un brûleur CH4/air de type bec Bunsen avec forçage turbulent multi-échelles produit par un système de trois grilles, est simulé numériquement par différentes techniques de simulation des grandes échelles (SGE), et les résultats sont comparés à l’expérience. On a développé et appliqué une formulation bas-Mach du solveur Navier-Stokes basé sur différents schémas numériques, allant des différences finies centrées d’ordre 4 à des versions avancées des schémas WENO d’ordre 5. La méthodologie est évaluée sur une série de cas-tests classiques (flamme laminaire 1D prémélangée, turbulence homogène et isotrope en auto-amortissement), et sur des simulations 2D de la flamme turbulente prémélangée expérimentale. Les SGE implicites (ILES), i.e. sans aucune modélisation sous-maille, et explicites avec le modèle de flamme épaissie et un modèle de plissement sous-maille nouvellement élaboré (TFLES), sont appliquées à la simulation 3D du brûleur expérimental. Les résultats montrent que l’approche TFLES avec un schéma d’ordre élevé à faible dissipation numérique prédit correctement la longueur de la flamme et la densité de surface de flamme. La SGE implicite avec un schéma WENO avancé produit une flamme trop courte mais réaliste à condition que la taille de la maille soit de l’ordre de l’épaisseur de flamme laminaire. La représentation des interactions flamme/turbulence est néanmoins très différente entre TFLES et ILES
The context of this study is the optimization of premixed turbulent combustion of syngas for clean energy production. A Bunsen-type CH4/air turbulent premixed burner with a multi-scale grid generator is simulated with different Large Eddy Simulation (LES) strategies and compared to experimental results. A low-Mach formulation of a compressible Navier-Stokes solver based on different numerical methods, ranging from 4th order central finite difference to 5th order advanced WENO schemes, is developed and applied. Classical test cases (1D laminar premixed flame, decaying HIT), and 2D simulations of the turbulent premixed flame are performed to assess the numerical methodology. Implicit LES (ILES), i.e. LES without any explicit subgrid modeling, and explicit LES with the Thickened Flame model and subgrid scale flame wrinkling modelling (TFLES) are applied to simulate numerically the 3D experimental burner. Results show that TFLES with a high-order low dissipation scheme predicts quite well the experimental flame length and flame surface density. ILES with advanced WENO schemes produces a slightly shorter although realistic flame provided the grid spacing is of order of the laminar flame thickness. The representation of flame/turbulence interactions in TFLES and ILES are however quite different
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Kriel, Albertus Johannes. "Pressure formulation and adaptive control of numerical algorithms for transient flow in pipe networks / Albertus Johannes Kriel." Thesis, North-West University, 2012. http://hdl.handle.net/10394/8756.

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Fluid flow network simulation codes are commonly used as a design and analysis tool for many engineering problems such as gas distribution networks, power plants and heat pumps. Two formulations of conservation of momentum have been widely applied in fluid flow network simulation models namely those based on static pressure and those based on total pressure. The total pressure formulations are convenient in that they eliminate the difficulties associated with the calculation of the convective terms and components such as pipe junctions are treated in a straightforward manner based on total pressure losses. However, the different formulations of total pressure for compressible and incompressible flow require different formulations of the momentum conservation equation, which is inconvenient for implementation in a generic network simulation code. In this thesis a united total pressure formulation is first derived which is valid for all fluids and therefore eliminates the inconvenience of switching between the compressible and incompressible formulations. A non-iterative method for the solution of the non-isothermal discretised equations based on the total pressure formulation is then introduced and consistency is illustrated. The method appears to be very stable for subsonic flows, while rapid steady state convergence is observed. A systematic comparison is also done with traditional static pressure based methods and the similarities and differences between the two formulations are illuminated. The different time scales involved in the simulation of transient flow in fluid networks are problematic when conventional fixed time step methods are used for time-wise integration. The time scales associated with acoustic and kinematic wave phenomena as well as storage effects can differ by orders in magnitude. This thesis also presents a simple adaptive time step algorithm which can be readily used in conjunction with all the commonly used first order methods for fluid flow networks. Two test problems are selected to demonstrate the efficiency and savings obtained with this procedure. The adaptive time step algorithm correctly selects appropriate time steps for all phenomena and significant computational savings are observed for accurate integration. In addition, a procedure is implemented which automatically selects the appropriate integration method. The resulting algorithm is a fully adaptive algorithm which switches between a fully implicit method and a semi-implicit method. Two test problems are once again used to demonstrate the efficiency and savings. The fully adaptive algorithm correctly selects appropriate methods for all phenomena and significant additional computational savings are observed.
Thesis (PhD (Mechanical Engineering))--North-West University, Potchefstroom Campus, 2013
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Books on the topic "Formulation implicite"

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Center, Ames Research, ed. Generalized formulation of a class of explicit and implicit TVD schemes. Moffett Field, Calif: National Aeronautics and Space Administration, Ames Research Center, 1985.

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Explicit and implicit compact high-resolution shock-capturing methods for multidimensional Euler equations I, formulation. Moffett Field, Calif: National Aeronautics and Space Administration, Ames Research Center, 1995.

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Renker, Elizabeth. Poetic Realisms. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198808787.003.0005.

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This chapter argues that multiple heterogeneous subtypes of realist poems circulated actively and to a broad readership during the postbellum period. These subtypes included but were not limited to the three heuristic categories presented in this chapter: gothic and phantasmagoric realism; social or earthly realism; and comic, commercial, and advertising realism. These subtypes often work in implicit modes of relation to the explicit romance/realist binary formulations traced in Chapter 2. Those explicit formulations undergird how these more implicit versions played out in a larger print-culture conversation. Yet, over the long history of scholarship that assumed a priori that poems were not an active part of “realism,” these implicit and attenuated realist poetries have been easy to miss. This chapter brings them back into a thicker history of postbellum realist poetries, demonstrating their wide circulation; their familiarity to readers; and their influence across print culture.
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Rajeev, S. G. Finite Difference Methods. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198805021.003.0014.

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This chapter offers a peek at the vast literature on numerical methods for partial differential equations. The focus is on finite difference methods (FDM): approximating differential operators by functions of difference operators. Padé approximants (Fornberg) give a unifying principle for deriving the various stencils used by numericists. Boundary value problems for the Poisson equation and initial value problems for the diffusion equation are solved using FDM. Numerical instability of explicit schemes are explained physically and implicit schemes introduced. A discrete version of theClebsch formulation of incompressible Euler equations is proposed. The chapter concludes with the radial basis function method and its application to a discrete version of the Lagrangian formulation of Navier–Stokes.
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Craissati, Jackie, and Colin Campbell. Making an impact: Have we got it right yet? Oxford University Press, 2018. http://dx.doi.org/10.1093/med/9780198791874.003.0008.

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This concluding chapter adopts a formulation-based approach to reflect on the tough question of whether the Offender Personality Disorder (OPD) pathway has achieved a real impact in terms of the national strategy’s high-level outcomes. First, the explicit and implicit premises of the former Dangerous and Severe Personality Disorder (DSPD) developments are considered, contrasting them with those underpinning the OPD pathway strategy. It is suggested that while DSPD was predicated on an illness model, the OPD strategy more accurately reflects a public health model, with the associated benefits and disadvantages. Second, the evidence for impact to date is summarized. Third, the high-level strategy outcomes are reworked in line with our theoretical model to achieve a more coherent articulation of the hypothesized mechanism of change within the pathway.
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Mastroianni, George R. Social Psychology. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780190638238.003.0009.

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Chapter 9 examines social-psychological approaches to understanding the Holocaust. Since Stanley Milgram’s obedience experiments were published in the early 1960s, social-psychological formulations based on obedience and social influence have dominated the psychology of the Holocaust. There is also a significant critical literature that challenges some of the findings and interpretation of Milgram and Phillip Zimbardo as they apply to the Holocaust. Social cognition is the study of thinking as situated in a social milieu and offers a fruitful framework for considering the ways Germans thought about one another during the Third Reich. Modern approaches to prejudice and racism, especially the study of unconscious or implicit biases, may provide insight into anti-Semitic attitudes prevalent in Germany (and elsewhere) during the Nazi years.
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Eisenberg, Melvin A. Relational Contracts. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780199731404.003.0054.

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Chapter 54 concerns relational contracts. Classical contract law was implicitly based on a paradigm consisting of a bargain made between strangers transacting on a perfect market, and focused on the static instant of contract formation, rather than dynamic processes such as the evolution of a contractual relationship. Relational-contract theory rejects the stranger-in-a-perfect-market paradigm and the static conception of contract law. Instead, it is based on a paradigm of a contractual transaction between actors who are in an ongoing and dynamic relationship. The identification of relational contracts as an economic and sociological entity is desirable. However, a theory of relational contracts requires the formulation of a body of legal rules applicable to, and only to, relational contracts. This is a place to which relational-contract theory has not gone and cannot go.
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North, Jill. Physics, Structure, and Reality. Oxford University Press, 2021. http://dx.doi.org/10.1093/oso/9780192894106.001.0001.

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How do we figure out the nature of the world from a mathematically formulated physical theory? What do we infer about the world when a physical theory can be mathematically formulated in different ways? Physics, Structure, and Reality addresses these questions, questions that get to the heart of the project of interpreting physics—of figuring out what physics is telling us about the world. North argues that there is a certain notion of structure, implicit in physics and mathematics, that we should pay careful attention to, and that doing so sheds light on these questions concerning what physics is telling us about the nature of reality. Along the way, lessons are drawn for related topics such as the use of coordinate systems in physics, the differences among various formulations of classical mechanics, the nature of spacetime structure, the equivalence of physical theories, and the importance of scientific explanation. Although the book does not explicitly defend scientific realism, instead taking this to be a background assumption, the account provides an indirect case for realism toward our best theories of physics.
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Laurence, Stephen, and Eric Margolis. The Scope of the Conceptual. Edited by Eric Margolis, Richard Samuels, and Stephen P. Stich. Oxford University Press, 2012. http://dx.doi.org/10.1093/oxfordhb/9780195309799.013.0013.

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This article explains different views on concepts, which are among the most fundamental constructs in cognitive science. Michael Dummett argues that nonhuman animals are not capable of full-fledged conceptual thought but only a diminished form of thought, which he calls, proto-thought. Human beings can remove themselves from the moment and can rise above the confined world of current perceptions because of their linguistic abilities. Donald Davidson, a contemporary philosopher, denies that animals are capable of conceptual thought and claim that conceptual content requires a rich inferential network. Donald Davidson made an argument against animals having conceptual thought. Davidson's original formulation of the argument begins with the claim that having a belief requires having the concept of a belief but adds that having the concept of belief requires possession of a natural language. It follows, then, that to have a belief requires facility with natural language. The characterization of the conceptual/nonconceptual distinction that is implicit in Davidson's metacognitive argument is a complex one involving a capacity for belief about beliefs, a concept of belief, and concepts of truth and falsity. Both Robert Brandom and John McDowell argued that conceptual thought requires more than a capacity for detection. They claim that conceptual thought requires the ability to appreciate the reasons that would justify a given concept's application and use, and this, in turn, is inherently a social practice that is dependent on natural language
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Dasgupta, Bhaskar. Polymyalgia rheumatica. Oxford University Press, 2013. http://dx.doi.org/10.1093/med/9780199642489.003.0134.

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This chapter reviews advances in pathogenesis; European League Against Rheumatism/American College of Rheumatology (EULAR/ACR) classification criteria with clinical, laboratory, and ultrasound criteria for classification as polymyalgia rheumatica (PMR); the heterogeneity and overlap between PMR, inflammatory arthritis, and large-vessel vasculitis as illustrated by representative cases; recent guidelines on early and correct recognition, investigations, and management of PMR; the scope of disease-modifying agents; socio-economic impact, outcomes, and patient experience in PMR. It also discusses areas for future research including clinical trials with biological agents and newer steroid formulations, standardized outcome assessments, and the search for better biomarkers in PMR. PMR is one of the common inflammatory rheumatic diseases of older people and represents a frequent indication for long-term glucocorticoid (GC) therapy. It is characterized by abrupt-onset pain and stiffness of the shoulder and pelvic girdle muscles. Its management is subject to wide variations of clinical practice and it is managed in primary or secondary care by general practitioners (GPs), rheumatologists, and non-rheumatologists. The evaluation of PMR can be challenging, as many clinical and laboratory features may also be present in other conditions, including other rheumatological diseases, infection, and neoplasia. PMR is usually diagnosed in the primary care setting, but standard clinical investigations and referral pathways for suspected PMR are unclear. The response to standardized therapy is heterogeneous, and a significant proportion of patients do not respond completely. There is also an overlap with inflammatory arthritis and large-vessel vasculitis for which adjuvant disease-modifying medications are often used. Prolonged corticosteroid therapy is associated with a variety of side effects, especially when high-dose glucocorticoid therapy is employed. Giant cell arteritis (GCA) is also often linked to PMR. It is a vasculitis of large- and medium-sized vessels causing critical ischaemia. GCA is a medical emergency because of the high incidence of neuro-ophthalmic complications. Both conditions are associated with a systemic inflammatory response and constitutional symptoms. The pathogenesis is unclear. The initiating step may be the recognition of an infectious agent by aberrantly activated dendritic cells. The key cell types involved are CD4+ T cells and macrophages giving rise to key cytokines such as interferon-γ‎ (implicated in granuloma formation), PDGF (intimal hyperplasia), and interleukin (IL)-6 (key to the systemic response). The pathogenesis of PMR may be similar to that of GCA, although PMR exhibits less clinical vascular involvement. The mainstay of therapy is corticosteroids, and disease-modifying therapy is currently indicated in relapsing disease.
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Book chapters on the topic "Formulation implicite"

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Villa, Tiziano, Timothy Kam, Robert K. Brayton, and Alberto Sangiovanni-Vincentelli. "Implicit Formulation of Unate Covering." In Synthesis of Finite State Machines, 301–21. Boston, MA: Springer US, 1997. http://dx.doi.org/10.1007/978-1-4615-6155-2_10.

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Muzeau, J. P., and M. Lemaire. "Reliability Analysis with Implicit Formulations." In Solid Mechanics and Its Applications, 141–60. Dordrecht: Springer Netherlands, 1997. http://dx.doi.org/10.1007/978-94-011-5614-1_7.

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Asada, Takashi, and Nobutada Ohno. "Implicit Formulation of Homogenization Method for Periodic Elastoplastic Solids." In Engineering Plasticity and Its Applications, 1055–60. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-433-2.1055.

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Hillman, M., and J. S. Chen. "An Implicit Gradient Meshfree Formulation for Convection-Dominated Problems." In Advances in Computational Fluid-Structure Interaction and Flow Simulation, 25–37. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-40827-9_3.

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Asada, Takashi, and Nobutada Ohno. "Implicit Formulation of Homogenization Method for Periodic Elastic-Viscoplastic Solids." In The Mechanical Behavior of Materials X, 853–56. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-440-5.853.

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Oliveira, Arlindo L., Luca P. Carloni, Tiziano Villa, and Alberto Sangiovanni-Vincentelli. "An implicit formulation for exact BDD minimization of incompletely specified functions." In VLSI: Integrated Systems on Silicon, 315–26. Boston, MA: Springer US, 1997. http://dx.doi.org/10.1007/978-0-387-35311-1_26.

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Arminjon, M., and J. L. Chenot. "An Implicit Formulation for Finite Element Analysis of Dynamic Plastic Deformation in 2D Geometry." In Transient/Dynamic Analysis and Constitutive Laws for Engineering Materials, 11–20. Dordrecht: Springer Netherlands, 1987. http://dx.doi.org/10.1007/978-94-009-3655-3_2.

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Backx, Wouter. "Commentary on Chapter “How B-C Connection and Negotiation of F Allow the Design and Implementation of a Cooperative and Effective Disputing in Rational Emotive Behavior Therapy”: REBT Provides a Firm Basis for Case Formulation by Employing an Ongoing, Implicit and Hypothetico-Deductive form of Data Collection in Critical Collaboration, Negotiation and an Equal Relationship with the Client." In CBT Case Formulation as Therapeutic Process, 99–106. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-63587-9_10.

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Colas, Clément, Martin Ferrand, Jean-Marc Hérard, Erwan Le Coupanec, and Xavier Martin. "An Implicit Integral Formulation for the Modeling of Inviscid Fluid Flows in Domains Containing Obstacles." In Springer Proceedings in Mathematics & Statistics, 53–61. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-57394-6_6.

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Cohen, Liron. "Non-well-founded Deduction for Induction and Coinduction." In Automated Deduction – CADE 28, 3–24. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-79876-5_1.

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AbstractInduction and coinduction are both used extensively within mathematics and computer science. Algebraic formulations of these principles make the duality between them apparent, but do not account well for the way they are commonly used in deduction. Generally, the formalization of these reasoning methods employs inference rules that express a general explicit (co)induction scheme. Non-well-founded proof theory provides an alternative, more robust approach for formalizing implicit (co)inductive reasoning. This approach has been extremely successful in recent years in supporting implicit inductive reasoning, but is not as well-developed in the context of coinductive reasoning. This paper reviews the general method of non-well-founded proofs, and puts forward a concrete natural framework for (co)inductive reasoning, based on (co)closure operators, that offers a concise framework in which inductive and coinductive reasoning are captured as we intuitively understand and use them. Through this framework we demonstrate the enormous potential of non-well-founded deduction, both in the foundational theoretical exploration of (co)inductive reasoning and in the provision of proof support for (co)inductive reasoning within (semi-)automated proof tools.
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Conference papers on the topic "Formulation implicite"

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Abdel-Malek, Karim, Jingzhou Yang, and Denis Blackmore. "Closed-Form Swept Volume of Implicit Surfaces." In ASME 2000 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2000. http://dx.doi.org/10.1115/detc2000/dac-14232.

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Abstract Recent developments in formulations for generating swept volumes have made a significant impact on the efficiency of employing such algorithms and on the extent to which formulations can be used in representing complex shapes. In this paper, we outline a method for employing the representation of implicit surfaces using the Jacobian rank deficiency condition presented earlier for the sweep of parametric surfaces. A numerical and broadly applicable analytic formulation is developed that yields the exact swept volume.
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Mandal, J., and K. Jain. "A New Implicit Formulation of KFVS Scheme for Euler Equations." In 36th AIAA Fluid Dynamics Conference and Exhibit. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2006. http://dx.doi.org/10.2514/6.2006-3709.

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Arana-Ortiz, Victor H., and Fernando Rodriguez. "A Semi-Implicit Formulation for Compositional Simulation of Fractured Reservoirs." In SPE Latin America/Caribbean Petroleum Engineering Conference. Society of Petroleum Engineers, 1996. http://dx.doi.org/10.2118/36108-ms.

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Peroomian, Oshin, Sukumar Chakravarthy, Sampath Palaniswamy, and Uriel Goldberg. "Convergence acceleration for unified-grid formulation using preconditioned implicit relaxation." In 36th AIAA Aerospace Sciences Meeting and Exhibit. Reston, Virigina: American Institute of Aeronautics and Astronautics, 1998. http://dx.doi.org/10.2514/6.1998-116.

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Gascuel, Marie-Paule. "An implicit formulation for precise contact modeling between flexible solids." In the 20th annual conference. New York, New York, USA: ACM Press, 1993. http://dx.doi.org/10.1145/166117.166157.

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Perez, Rafael, and Robert Walters. "An Implicit Compact Polynomial Chaos Formulation for the Euler Equations." In 43rd AIAA Aerospace Sciences Meeting and Exhibit. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2005. http://dx.doi.org/10.2514/6.2005-1406.

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Correˆa, F. N., and B. P. Jacob. "An Efficient Time-Frequency Domain Solution Procedure for the Analysis of Offshore System." In ASME 2011 30th International Conference on Ocean, Offshore and Arctic Engineering. ASMEDC, 2011. http://dx.doi.org/10.1115/omae2011-50218.

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This work presents a formulation review of a hybrid time-frequency domain Green approach method (HTF-GA) for the solution of offshore systems. A step-by-step time domain solution procedure is established, based on the convolution between the Green functions of the problem and the vector of external loads. The Green functions are implicitly calculated in the frequency-domain. The accuracy is significantly improved when compared with traditional direct integration methods, or with other methods based on the Green approach. This method is able to deal with non-linear behaviour and implicity consider the frequency dependence of added mass and potential damping, encountered in offshore systems problems.
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Chen, Hailong, Yile Hu, and Benjamin W. Spencer. "A MOOSE-Based Implicit Peridynamic Thermomechanical Model." In ASME 2016 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/imece2016-65552.

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In this paper, we present an implicit formulation of peridynamic theory for coupled thermomechanical problem based on the Multiphysics Object-Oriented Simulation Environment (MOOSE) framework, with special application to the simulation of fracture behavior of nuclear fuels at high temperature. First, the coupled peridynamic thermomechanical model is briefly reviewed. Next, an implicit formulation for the solution of static or quasi-static problems is proposed. Finally, the formulation is verified against benchmark solutions for both elasticity and heat conduction problems. The nuclear fuel fracture problems is modeled using the proposed implicit scheme. The mesh dependencies of crack initiation are also investigated.
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Abdel-Malek, K., Harn-Jou Yeh, and Mohamad Alkam. "Control Barriers of Positioning Manipulators." In ASME 1999 Design Engineering Technical Conferences. American Society of Mechanical Engineers, 1999. http://dx.doi.org/10.1115/detc99/dac-8640.

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Abstract Broadly applicable formulations for identifying control difficulties in positioning serial manipulators are developed based on the Implicit Function Theorem and acceleration analyses on singular surfaces. As a result, voids in the workspace are also identified. Rank deficiency conditions are applied to the positioning Jacobian with joint constraints included in the formulation. Geometric entities upon which the manipulator exhibits control difficulties are identified. These difficulties are associated with a admissible motion along a vector normal to the singular geometric entities. Definiteness properties of a quadratic form that is as a result of normal acceleration define control difficulties. Numerical examples are illustrated.
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Milano, Federico. "Semi-implicit formulation of differential-algebraic equations for transient stability analysis." In 2017 IEEE Power & Energy Society General Meeting (PESGM). IEEE, 2017. http://dx.doi.org/10.1109/pesgm.2017.8274577.

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Reports on the topic "Formulation implicite"

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Mitchell, John Anthony. Mean curl formulation on quadrilaterals with application to implicit magnetics diffusion equations in Alegra 2D. Office of Scientific and Technical Information (OSTI), June 2012. http://dx.doi.org/10.2172/1057253.

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Prakash, Naveen, Christopher Matthews, and Daniele Versino. Stress and tangent update equations for combined time-hardening creep and J2 plasticity in an implicit hypo-elastic formulation. Office of Scientific and Technical Information (OSTI), December 2018. http://dx.doi.org/10.2172/1489923.

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Prakash, Naveen, Christopher Matthews, Daniele Versino, and Cetin Unal. A general constitutive framework for the combined creep, plasticity and swelling behavior of nuclear fuels in an implicit hypoelastic formulation. Office of Scientific and Technical Information (OSTI), January 2019. http://dx.doi.org/10.2172/1493517.

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