Academic literature on the topic 'Méthode des clusters couplées'
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Journal articles on the topic "Méthode des clusters couplées":
Copin, Mireille, Cyrille Granget, and Inès Saddour. "Étude des verbes de collision instrumentée en français L1 et L2 : apport du clustering." SHS Web of Conferences 191 (2024): 10003. http://dx.doi.org/10.1051/shsconf/202419110003.
Talon, Brigitte, Christopher Carcaillet, and Michel Thinon. "Études pédoanthracologiques des variations de la limite supérieure des arbres au cours de l’Holocene dans les alpes françaises." Géographie physique et Quaternaire 52, no. 2 (October 2, 2002): 195–208. http://dx.doi.org/10.7202/004875ar.
Morandini, J., Y. du Terrail Couvat, and Ph Massé. "Résolution des équations thermo-électriques 3D couplées par la méthode des éléments finis. Application à un four polyphasé." Journal de Physique III 2, no. 11 (November 1992): 1979–90. http://dx.doi.org/10.1051/jp3:1992224.
Bennacer, Rachid, Abdelwahab Tobbal, and Hassen Beji. "Convection naturelle Thermosolutale dans une Cavité Poreuse Anisotrope: Formulation de Darcy-Brinkman." Journal of Renewable Energies 5, no. 1 (June 30, 2002): 1–21. http://dx.doi.org/10.54966/jreen.v5i1.882.
Chekchaki, Samir, Arifa Beddiar, and Mohamed Djalil Zaafour. "Cartographie par télédétection des milieux envahis par Acacia mearnsii De Wild. dans l’extrême Nord-Est algérien." BOIS & FORETS DES TROPIQUES 343 (January 14, 2020): 5–16. http://dx.doi.org/10.19182/bft2020.343.a31835.
Khemiri, Khaoula, and Sihem Jebari. "Évaluation de l’érosion hydrique dans des bassins versants de la zone semi-aride tunisienne avec les modèles RUSLE et MUSLE couplés à un Système d’information géographique." Cahiers Agricultures 30 (2021): 7. http://dx.doi.org/10.1051/cagri/2020048.
Djiwa, Oyetounde, Hodabalo Pereki, and Kudzo Atsu Guelly. "Perceptions ethnoculturelles des services écosystémiques rendus par les agroforêts à base de cacaoyer au Togo." BASE, no. 3 (2021): 208–22. http://dx.doi.org/10.25518/1780-4507.19153.
Bellafrouh, K., H. Chermette, C. Daul, A. Goursot, and F. Michel-Calendini. "Calcul des multiplets de spin de l'ion Cr3+ pour des clusters (Cr06)9- à l'aide de la méthode MS-Xα." Journal de Chimie Physique 86 (1989): 933–42. http://dx.doi.org/10.1051/jcp/1989860933.
SZUCS-BLANARU, Amelia. "Le jeu avec les couleurs du piano. Quelques exemples dans Játékok (Jeux) de György Kurtág." BULLETIN OF THE TRANSYLVANIA UNIVERSITY OF BRASOV SERIES VIII - PERFORMING ARTS 13 (62), SI (January 20, 2021): 295–304. http://dx.doi.org/10.31926/but.pa.2020.13.62.3.32.
Semedo, Gervasio, Laurent Gautier, and Kamel Malik Bensafta. "Pôles de convergence, gains dynamiques de l’intégration économique et monétaire en Afrique de l’Ouest : une approche en termes de clusters." Articles 88, no. 1 (February 11, 2013): 37–85. http://dx.doi.org/10.7202/1014026ar.
Dissertations / Theses on the topic "Méthode des clusters couplées":
Wang, Yipeng. "Estimation d’erreur a posteriori pour des calculs de structure électronique par des méthodes ab initio et son application pour diminuer le coût de calcul." Electronic Thesis or Diss., Sorbonne université, 2023. http://www.theses.fr/2023SORUS656.
The thesis is concerned with the error analysis of electronic structure calculation. The long term goal is to, in one hand, derive computable a posteriori error estimator for ab initio methods and, in the other hand, propose near-optimal computational cost strategy for the numerical calculation of those methods based on the a posteriori error estimation and the separation of the discretization and iteration error sources.In the first part of the thesis, we introduce a new well-posedness analysis for the single reference coupled cluster method based on the invertibility of the CC derivative. Under the minimal assumption that the sought-after eigenfunction is intermediately normalisable and the associated eigenvalue is isolated and non-degenerate, we prove that the continuous (infinite-dimensional) CC equations are always locally well-posed. Under the same minimal assumptions and provided that the discretization is fine enough, we prove that the discrete Full-CC equations are locally well-posed, and we derive residual-based error estimates with guaranteed positive constants.The second part of the thesis focus on the application of a posteriori error estimation to construct near-optimal path when approximating the solution of PDEs. We firstly apply a probabilistic method to explore an optimal path that minimizes the cost for the numerical resolution of linear and nonlinear elliptic source problems. Based on the analysis of those optimal paths, we propose two near-optimal strategies to achieve a given accuracy based on the error sources decomposition of the error estimator. Finally, we validate the feasibility of those near-optimal strategies by applying them to the numerical approximation of a nonlinear eigenvalue problem, i.e., the Gross-Pitaevskii equation
Briceno-Arias, Luis. "Problèmes d'inclusions couplées : éclatement, algorithmes et applications." Paris 6, 2011. http://www.theses.fr/2011PA066622.
Tournour, Michel. "Modélisation numérique par éléments finis et éléments finis de frontière du comportement vibroacoustique de structures complexes assemblées et couplées à une cavité." Compiègne, 1999. http://www.theses.fr/1999COMP1197.
Courtois, Théophane. "Qualité spectrale des prédictions acoustiques obtenues par méthode géométrique dans des cavités couplées et absorbantes : moyennes fréquences." Rouen, 2002. http://www.theses.fr/2002ROUES047.
Numerical modeling of coupling in acoustics in the medium frequency range poses problems due to the size of the domains. With the ray method in damped cavities, it is possible to target a small number of points inside the domain and, subsequently, to reduce calculation time, making it possible to look for spectral instead of harmonic results. Does this still hold when the cavities are coupled thanks to an integral representation using such Green functions? An original image-source technique is first developed to avoid geometrical approximations. But in fact, due to inherent approximations, the ray method is inaccurate in the presence of absorbent walls. An analysis shows that a hierarchy exists among the errors arising from the rays, and finally it appears that only the grazing rays must be replaced by another approximation. In these conditions, the ray method is capable of solving coupling problems in medium frequency range as confirmed by finite elements and experimental comparisons
Morandini, Jacques. "Contribution à la résolution multi-méthode des équations aux dérivées partielles couplées rencontrées en magnéto-thermo-hydrodynamique." Grenoble INPG, 1994. http://www.theses.fr/1994INPG0068.
Tannous, Mickhael. "Développement et évaluation d'approches de modélisation numérique couplées 1D et 3 D du contact rotor-stator." Ecole centrale de Nantes, 2013. http://www.theses.fr/2013ECDN0015.
Rotor dynamic problems with rotor to stator contact interactions are dealt with in the literature by 1D local models. This leads to an affordable simulation time, but the corresponding approximations are difficult to assess. Since the contact is limited in space and time, the same strategy can therefore be used with 3D models. A strategy, called switch, allowing the use of a beam model and a 3D model (or beam-3D mixed model), at two different stages of the same simulation, is developed. It is implemented in a non-intrusive way for the simulation of transient dynamic problems, with or without an overall rotation, solved by an implicit time integration scheme. The switch is validated by comparison with a 3D reference solution obtained by performing the full simulation on the 3D model. We, then, compare and analyze the results of 1D and 3D rotor-stator contact problems, for different contact conditions more and less severe. The rotor vibrations are due to rotating imbalance at a given constant rotating speed. It appears that the differences between the 1D and the 3D results are not obvious on the rotor orbits. However, the limitations of the 1D simulation are highlighted. Indeed, the rigid body section assumption in a beam model of the rotor leads to approximations in the spatial distribution of the contact forces and their intensity. The 3D model, however, can present some local effects in the vicinity of the contact zone
Halbert, Loïc. "La méthode Equation of Motion Coupled Cluster pour la modélisation des états excités et propriétés des molécules contenant des éléments lourds." Electronic Thesis or Diss., Université de Lille (2018-2021), 2021. http://www.theses.fr/2021LILUR038.
In this thesis, we seek to obtain certain molecular properties for species containing heavy elements or presenting atmospheric interests. For this, we use techniques to characterize the core electrons, with ionization potentials (IP) or with excitation energies (EE), allowing for example to respectively interpret X-ray Photoelectron Spectroscopy(XPS) and X-ray Absorption Spectroscopy (XAS). We also seek to characterize valence electrons through the polarizability, which is used for example to develop force fields. When we work with heavy elements or with core electrons, we must take relativistic effects into account. We therefore used the Dirac-Coulomb(-Gaunt) Hamiltonian. Furthermore, to compare our results with experiments, we need precise methods. Thus, we will work with the Coupled-Cluster (CC) method, and will use the Equation of Motion Coupled-Cluster (EOM-CC) method to obtain the IPs, EEs and electron affinities (EA). However, these two elements (4-component Hamiltonians and post-Hartree-Fock methods) imply considerable computational costs, requiring the resources of High Performance Computing (HPC) platforms.This thesis presents a study of the Core-Valence Separation (CVS) method, which will allow us to reach the properties of core electrons (IP and EE) with EOM-CC. We provide a detailed investigation of the performance of different Hamiltonians, in particular the exact two-component molecular mean field Hamiltonian. Second, we will focus on the perturbative approximations (Partioned and Many Body Perturbation Theory 2d order (MBPT (2)) to be applied to the EOM-CC matrix to limit computational costs, including for core processes. Finally, we present the work carried out in Exacorr, a new relativistic coupled cluster implementation for hybrid and massively parallel architectures. We will finish by outlining the formalism and working equations for the Linear Response Coupled-Cluster (LRCC) method, through which analytical (frequency-dependent) molecular polarizabilities can be obtained
Djehaf, Fatiha. "Etude du problème de Maxwell quasi-stationnaire par équations intégrales en champ couplées à une méthode par éléments finis." Paris 11, 2008. http://www.theses.fr/2008PA112012.
This thesis concerns the modeling of eddy currents appearing in a not simply connected conductor (NSC) put in a not bounded domain. We associate a finite element method in the conductor and an integral method on its boundary. Usually, the integral method used for this problem implies to discretize a Poincaré-Stecklov’s operator; this is very heavy and does not easily permits to consider NSC. We therefore choose to use fields integral representations similar to Stratton-Chu’s formulas but adapted to the quasi-stationary approximation. We couple a variational formulation of these integral formulations to a finite element formulation in the conducting volume. We show that, in the used functional frame, (H(curl) in the volume and tangential traces spaces on the boundary), the continuous problem is well defined. We next present the discrete problem study with Nédélec’s finite elements of order 1. We show that it is well posed and we study an a priori estimation error. We next proceed to the code validation, first on a simple problem , the analytical solution of which is known (conducting sphere in an homogeneous magnetic field) and then on an international test problem, where the conductor is not simply connected and for which we have results obtained with other logicials. We so verify that our code does not need any adaptation for the not simply connected cases and that our results are quite satisfying
Agroum, Rahma. "Discrétisation spectrale des équations de Navier-Stokes couplées avec l'équation de la chaleur." Thesis, Paris 6, 2014. http://www.theses.fr/2014PA066195/document.
In this thesis we consider the discretization by spectral method and the numerical simulation of a viscous incompressible fluid in the domain ?, the model being the Navier-Stokes equations. We have chosen to couple them with the heat equation where the viscosity of the fluid depends on the temperature, with boundary conditions which involve the velocity and the temperature. The method is proved to be optimal in the sense that the order of convergence is only limited by the regularity of the solution. The numerical analysis of the discrete problem is performed and numerical experiments are presented, they turn out to be in good coherence with the theoretical results. Finally, we consider the unsteady Navier-Stokes/heat equations which models the time-dependent flow. We propose a discretization of this problem that relies on a backward Euler's scheme in time and spectral methods in space and present some numerical experiments which confirm the interest of the discretization
Fakhreddine, Khaled. "Contribution à la théorie de collision : résolution d'un système d'équations radiales couplées de Schrodinger par la méthode des fonctions canoniques." Lyon 1, 1993. http://www.theses.fr/1993LYO10008.
Books on the topic "Méthode des clusters couplées":
Curotto, Emanuele. Stochastic Simulations of Clusters. Taylor & Francis Group, 2009.
Curotto, Emanuele. Stochastic Simulations of Clusters: Quantum Methods in Flat and Curved Spaces. Taylor & Francis Group, 2009.
Curotto, Emanuele. Stochastic Simulations of Clusters: Quantum Methods in Flat and Curved Spaces. Taylor & Francis Group, 2017.