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Статті в журналах з теми "Milieux périodiques et quasi-Périodiques":
Chevreux, Élodie. "Systéme médiatique et littérature: La Quinzaine littéraire et le Magazine littéraire dans les années 1966–68." Irish Journal of French Studies 17, no. 1 (December 2, 2017): 1–21. http://dx.doi.org/10.7173/164913317822236147.
Vynck, Kevin, Gary Fourneau, Romain Pacanowski, Pascal Barla, and Philippe Lalanne. "De l’impact du désordre sur l’apparence visuelle de surfaces nanostructurées." Photoniques, no. 124 (2024): 34–38. http://dx.doi.org/10.1051/photon/202412434.
Francoeur, Paul. "Les 25 ans de SDM : une histoire à suivre." Documentation et bibliothèques 36, no. 1 (January 28, 2015): 5–9. http://dx.doi.org/10.7202/1028197ar.
Berestycki, Henri, François Hamel, and Lionel Roques. "Équations de réaction–diffusion et modèles d'invasions biologiques dans les milieux périodiques." Comptes Rendus Mathematique 339, no. 8 (October 2004): 549–54. http://dx.doi.org/10.1016/j.crma.2004.07.025.
Lüsebrink, Hans-Jürgen. "Interculturalités américaines. La trajectoire de Paul-Marc Sauvalle, cosmopolite canadien-français." Globe 7, no. 2 (February 18, 2011): 81–99. http://dx.doi.org/10.7202/1000862ar.
Poitras, Claire. "L’histoire urbaine au Québec durant les années 1990 : de nouvelles tendances1 ?" Revue d'histoire de l'Amérique française 54, no. 2 (July 21, 2004): 219–45. http://dx.doi.org/10.7202/005571ar.
Kagambèga, François Wenemi, Rasmata Nana, Philippe Bayen, Adjima Thiombiano, and Joseph Issaka Boussim. "Tolérance au déficit hydrique de cinq espèces prioritaires pour le reboisement au Burkina Faso." BASE, no. 4 (2019): 245–56. http://dx.doi.org/10.25518/1780-4507.18199.
Normand, Sylvio. "Profil des périodiques juridiques québécois au XIXe siècle." Les Cahiers de droit 34, no. 1 (April 12, 2005): 153–82. http://dx.doi.org/10.7202/043200ar.
Corbeil, Pierre. "La documentation périodique en anthropologie : variabilité, classification et indexation." Documentation et bibliothèques 39, no. 3 (February 18, 2015): 117–28. http://dx.doi.org/10.7202/1028747ar.
Mathieu, Anne. "Visages du Monde . Une revue culturelle médicale singulière (1933-1940)." La Revue des revues N° 71, no. 1 (May 6, 2024): 20–49. http://dx.doi.org/10.3917/rdr.071.0020.
Дисертації з теми "Milieux périodiques et quasi-Périodiques":
Alavi, Seyed Ehsan. "Homogénéisation de milieux architecturés périodiques et quasi-périodiques vers des milieux continus généralisés." Electronic Thesis or Diss., Université de Lorraine, 2021. http://www.theses.fr/2021LORR0305.
This thesis aims to revisit higher-order homogenization schemes towards higher-order or higher gradient continua, successively for periodic and quasi-periodic architected materials and composites, based on variational principles and an extension of Hill macrohomogeneity condition. Continuous homogenization methods are exposed in Part I for micropolar and micromorphic media, followed by an exposition of the alternative discrete homogenization method.We have extended these theoretical developments to the situation of quasi-periodic materials, which still have a regular microstructure. The common idea to the proposed periodic homogenization methods of continuous or discrete nature is to split the microscopic displacement into a homogeneous part representative of the kinematics of the adopted effective continuum and a fluctuation evaluated from a variational principle. In substance, the theoretical developments allow the elaboration of enriched continua (generalized continua) of micromorphic type and all sub continua obtained using suitable degeneration conditions. Numerical applications have been made for architected materials and inclusion-based composites prone to higher-order effects due to their inner architecture. On the theoretical framework, the performed developments remedy many existing limitations of existing higher-order homogenization schemes.In Part II, repetitive lattice materials' effective classical and higher-order mechanical properties have been evaluated based on discrete homogenization schemes. Following the idea of a phenomenological approach, consistent couple stress models of repetitive beam lattices have been elaborated. Enriched Cosserat media have been derived in the spirit of micromechanics, adopting Timoshenko beam models at a microlevel, and applying a continualization method towards a Cosserat effective substitution medium. The proposed continualization method proves to be accurate and computationally efficient compared to continuous homogenization schemes and fully resolved finite element simulations. One key outcome of the performed analyses is the quantification of edge effects in the response of lattice structures, relying on the surface formulation of the extended Hill macrohomogeneity condition.The theoretical background underlying quasi-periodic asymptotic homogenization in the framework of linearized anisotropic elasticity deserves the development of Part III. Different methodologies for evaluating the effective quasi-periodic properties have been elaborated, leading to the emergence of strain gradient effective media. Conformal transformations define a specific class of geometrical mappings, allowing for designing compatible architected materials with inner porosity gradient, making them suitable bone biomechanics candidates
Souadnia, Azzedine. "Dispersion permanente et transitoire en milieux poreux spatialement périodiques." Vandoeuvre-les-Nancy, INPL, 1999. http://www.theses.fr/1999INPL001N.
Coatléven, Julien. "Analyse mathématique et numérique de quelques problèmes d'ondes en milieux périodiques." Palaiseau, Ecole polytechnique, 2011. http://pastel.archives-ouvertes.fr/docs/00/64/92/12/PDF/memoire.pdf.
The modeling of many interesting physical problems leads to partial differential equations, in a domain whose geometry and coefficients are functions periodic outside some regions, called scatterers, which are small with respect to the full domain of interest. The caracteristics of these problems often prevent us from applying classical homogeneization techniques, that is why we have developped new methods to restrict the computational domain to bounded domains. We have generalized the Lippmann-Schwinger equation approach, which allows us to treat bounded and structured unbounded scatterers, the main issue being that for a generic periodic media there is no analytic representation of the solution in the case without scatterers (i. E the Green function is unknown). Dirichlet-to-Neumann maps for periodic strips infinite in one direction play a key role in our approach. We treat two kinds of problems : time harmonic problems, for which the DtN maps for strip problems are known, and evolution problems, for which we present a method of derivation of these operators. In these two cases, we first treat the case of one bounded or unbounded scatterer, then we generalize the multiple scattering methods for homogeneous media to the case of periodic media, which allow us to handle several scatterers as wel
Dos, Reis Francisco. "Homogénéisation automatique de milieux discrets périodiques : applications aux mousses polymères et aux milieux auxétiques." Thesis, Vandoeuvre-les-Nancy, INPL, 2010. http://www.theses.fr/2010INPL050N/document.
The first achievement of this work is to construct a unified and effective continuum equivalent to a lattice of beams, in the elastic domain, using a Bernoulli beam model. An extension has been done to calculate the elastic domain resistance of such lattices and to build an algorithm for monitoring the constitutive law taking into account work hardening. The choice of the asymptotic expansions leads to a classical continuous or to a micropolar elastic continuum. We restrict in this last case our study to lattices with centro-symmetric unit cells. The numerical codes developed provide the stress-strain relationship and the effective mechanical moduli. A wide variety of trusses has been studied, either existing or original, including typical geometries of foams and various auxetic lattices, exhibiting negative contraction coefficients. The results were systematically compared with data from literature and verified by finite element simulations with a good agreement. The homogenization in the plastic range has been limited to stretching dominated lattices. The equilibrium equations of the discrete asymptotic homogenization have been used to automatically obtain the elastic resistance domain for several trusses, and a return-mapping algorithm for the follow up of the stress-strain relationship including hardening has been conceived and implemented in a dedicated code. An isotropic hardening elastoplastic model of the beam has been used. The application of the algorithm to the simulation of a loading-unloading cycle shows a good agreement between the homogenized lattice and finite element simulations
Van, Der Biest François. "Diffusion multiple et renversement du temps ultrasonore dans des milieux périodiques et désordonnés." Phd thesis, Université Paris-Diderot - Paris VII, 2005. http://tel.archives-ouvertes.fr/tel-00011354.
Nous avons tout d'abord conçu et caractérisé des échantillons périodiques, autrement appelés "cristaux phononiques". Ces matériaux se comportent comme des filtres fréquentiels et présentent un grand intérêt technologique et théorique.
Nous avons étudié le temps de groupe à la traversée de monocristaux, qui révèle un effet analogue à l'effet tunnel en mécanique quantique. Dans une structure de type Fabry-Pérot constituée de deux cristaux phononiques, nous avons mis en évidence des résonances en transmission. L'étude du temps de groupe montre un phénomène de piégeage de l'onde dans la cavité, analogue de l'effet tunnel résonant. Les résultats obtenus sont confirmés par la modélisation numérique.
Par la suite, des expériences de Retournement Temporel dans les cristaux phononiques ont révélé une absence d'hyperfocalisation, caractéristique des milieux désordonnés.
Nous avons ensuite cherché à mettre en évidence la diffusion multiple en régime non-linéaire dans les nuages de bulles. A cet effet, nous avons conçu un dispositif expérimental qui nous a permis de générer des populations de bulles relativement stables et contrôlées. Plusieurs méthodes de caractérisation de la fonction de distribution du rayon des bulles ont été mises en oeuvre, et l'une d'elles nous a permis d'estimer la fraction volumique de bulles.
Les densités de bulles mises en jeu n'ont pas permis de mettre en évidence un régime de diffusion multiple fort, tandis que l'origine des non-linéarités observées reste incertaine.
Tizianel, Julian. "Ondes complexes au dessus de matériaux poreux et de structures périodiques." Le Mans, 1999. http://www.theses.fr/1999LEMA1011.
Arlaud, Elodie. "Modèles dynamiques réduits de milieux périodiques par morceaux : application aux voies ferroviaires." Thesis, Paris, ENSAM, 2016. http://www.theses.fr/2016ENAM0047/document.
Railway tracks have evolved over years based on empirical results and their dynamic behavior still can be difficult to assess or to quantify. A numerical model can thus provide assistance in track design by assessing the mechanical performance of new structures, or allowing the diagnostic of existing track parts, as a complement to relevant in-situ measurements.The numerical model developed in this work combines a reduction strategy with numerical techniques used to solve the propagation equations in waveguides in the frequency / wave number domains. The peculiarity of the exposed methodology is the introduction of a model based on a periodic sub structuring of the track, keeping only a few wavelengths carefully chosen to solve dispersion equations. Based on this model reduction technique and its extension to time domain models with moving contact, the computational time and storage capacity required are greatly reduced. Thus, this model is efficient and useful for engineering purposes in railway tracks studies.Numerical validation of the reduction is carried out by building a complete reference model in the frequency domain. In parallel, measurement campaigns (receptance measurement and sleeper acceleration under passing trains) were performed on a transition zone between ballasted and slab tracks on a High Speed Line. These tests are compared to simulation results in both time and frequency domains on different areas of the transition. After successful validation, the model is used to improve understanding of the role of the substructure on the dynamic behavior.The final major development of this work is the introduction of a strategy to extend the reduction to piecewise periodic structures and the development of post-processing tools to highlight the dynamic effects generated by the transition zone
Nguyen, Trung Kien. "Homogénéisation numérique de structures périodiques par transformée de Fourier : matériaux composites et milieux poreux." Phd thesis, Université Paris-Est, 2010. http://tel.archives-ouvertes.fr/tel-00598465.
To, Viet Thanh. "Contributions au calcul analytique et numérique des propriétés homogénéisées des composites et des milieux poreux périodiques." Thesis, Paris Est, 2015. http://www.theses.fr/2015PEST1069/document.
In this work, we determine the macroscopic properties of thermal transfer and mass transport in periodic heterogeneous materials. All the results are established in the framework of periodic homogenization, for which, the macroscopic properties are deduced by solving elementary problems for the irreducible cell. Various contributions are provided, leading to the derivation of new closed-form expressions for the effective properties or by developing numerical tools. In the first part, we determine the nonlinear filtration properties of porous media. At the microscopic scale, the fluid flow obeys to the Navier-Stokes equation. By expanding the solution into power series, we obtain, after homogenization, a polynomial type macroscopic filtration law. All the constitutive coefficients of are determined by solving a hierarchy of cell problems by means of a numerical approach based on the Fast Fourier Transform algorithm. The problem of conductivity of periodic composites reinforced by spherical inclusions is thereafter considered by an analytic approach. We solve the Lippmann-Schwinger integral equation using Neumann series and a constant polarization in the inclusion. Closed-form estimate of the macroscopic conductivity are then obtain for different spatial configurations: cubic lattice and isotropic distribution of inclusions. In the last part, we determine the thermal transfer properties by conduction and convection of porous media fulfilled by a viscous fluid. Again, numerical tools based on FFT are considered to solve the unit cell problems and to compute the diffusivity tensor
Dumeige, Yannick. "Génération de second harmonique dans les milieux périodiques uni ou bidimensionnels à semiconducteurs III-V." Paris 11, 2002. http://www.theses.fr/2002PA112214.
Phase matching is indispensable to obtain efficient second order non-linear interactions. III-V semiconductors materials have optical properties which don't allow us to obtain phase matching by usual ways. Hence we must use artificial media like periodic structures to achieve chromatic or group velocity dispersion engineering. We fabricated and studied experimentally laminar periodic structures and more particularly AlGaAs/AlOx multilayers. This kind of periodic structures permit phase matching and a simultaneous increase in the density of optical modes which is favourable for the conversion efficiency in the second harmonic generation process. By comparing different structures, we established that the conversion efficiency grows faster than the fifth power of the number of unit cells. We also studied numerically periodic structures in the waveguided regime. In order to simulate their behaviour we developed a non-linear FDTD (Finite Difference Time Domain) code. Subsequently we used it to simulate the non-linear interactions in a 1D photonic crystal constituted by a planar waveguide periodically etched. We proposed a structure achieving a compromise between confinement and diffraction lasses. Finally we demonstrated numerically with our non-linear FDTD code that a 2D photonic crystal defect waveguide allows simultaneously the waveguiding of the two waves in non-linear interaction and the phase-matching condition
Книги з теми "Milieux périodiques et quasi-Périodiques":
Église catholique. Archidiocèse de Québec. Administrateur (1855-1867 : Baillargeon). Circulaire: Une œuvre sainte et destinée à produire de grands fruits s'est établie, depuis quelques années, au milieu de notre peuple religieux .. [Québec?: s.n., 1985.
Частини книг з теми "Milieux périodiques et quasi-Périodiques":
Moliton, André. "Structure de bande des milieux tridimensionnels: du cas des milieux périodiques au cas des milieux π-conjugués supposés « parfaits »." In Electronique et optoélectronique organiques, 27–58. Paris: Springer Paris, 2011. http://dx.doi.org/10.1007/978-2-8178-0103-2_2.
Moliton, André. "Rappels sur l’origine de la structure de bandes dans les milieux périodiques unidimensionnels." In Electronique et optoélectronique organiques, 1–25. Paris: Springer Paris, 2011. http://dx.doi.org/10.1007/978-2-8178-0103-2_1.
Тези доповідей конференцій з теми "Milieux périodiques et quasi-Périodiques":
Marcotte, Sophie. "Le calme après la tempête. Le pouvoir symbolique de l'eau dans l'œuvre de Gabrielle Roy." In XXV Coloquio AFUE. Palabras e imaginarios del agua. Valencia: Universitat Politècnica València, 2016. http://dx.doi.org/10.4995/xxvcoloquioafue.2016.2527.