Academic literature on the topic 'Propriétés radiatives et effectives'
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Journal articles on the topic "Propriétés radiatives et effectives":
Haller, X., Y. Monerie, S. Pagano, and P. G. Vincent. "Propriétés élastiques effectives des matériaux nanoporeux à cavités sphériques et sphéroïdales." Matériaux & Techniques 103, no. 3 (2015): 302. http://dx.doi.org/10.1051/mattech/2015021.
Krauth, P. J., and R. Fatrez. "De la mesure de laboratoire à la mesure en ligne et en continu des propriétés radiatives des tôles." Revue de Métallurgie 95, no. 6 (June 1998): 809–22. http://dx.doi.org/10.1051/metal/199895060809.
Dorval, Vincent, Nicolas Leymarie, Alexandre Imperiale, Edouard Demaldent, Zakaria Aghenzour, and Pierre-Emile Lhuillier. "Simulations numériques à l'échelle de microstructures hétérogènes pour déterminer des propriétés effectives de propagation ultrasonore." e-journal of nondestructive testing 28, no. 9 (September 2023). http://dx.doi.org/10.58286/28514.
DAOUAGA SAMARI, Gilbert. "Les pratiques d’enseignement des langues nationales au Cameroun : entre banalisation et généralisation abusive de savoirs enseignés." JEYNITAARE. Revue panafricaine de linguistique pour le développement 2, no. 1 (January 14, 2023). http://dx.doi.org/10.46711/jeynitaare.2023.2.1.2.
Dissertations / Theses on the topic "Propriétés radiatives et effectives":
Guerra, Timothée. "Interaction lumière-matière dans des suspensions de nanoparticules : homogénéisation et conception de nouvelles propriétés optiques." Electronic Thesis or Diss., Orléans, 2024. http://www.theses.fr/2024ORLE1005.
Disordered media composed of nanoparticles are of great importance in many applications, particularly those related to energy efficiency such as radiative cooling. Understanding the light-matter interaction is therefore essential, but highly complex. Indeed, these studies often involve solving Maxwell's equations in systems made up of thousands of particles, to take account of scattering and interference phenomena. In order to reduce the ensuing numerical burden, this thesis focuses on 2D systems, with some discussion of 3D systems. In this context, the first part of this manuscript focuses on the concept of homogenization for particle systems that are small relative to the radiation wavelength and may exhibit resonances. This study highlights exotic behaviours that allow us to discuss, among other things, the link between homogenization and coherent and incoherent parts of the scattered field.The second part is dedicated to optimizing the absorption of radiation in subwavelength plates made of nanoparticles. It is shown that the use of resonant particles only results in absorption up to 70%. However, combining them with purely scattering particles results in near-perfect absorption (∼95%), through an effect similar to critical coupling. Finally, a detailed study of the mechanisms governing absorption gain in 2D has enabled them to be reproduced in 3D systems
Szczap, Frédéric. "Etude des effets des heterogeneites des nuages sur leurs proprietes radiatives effectives et leurs parametrisations." Clermont-Ferrand 2, 2000. http://www.theses.fr/2000CLF22188.
Deville, Pascal. "Modélisation et simulation des propriétés radiatives des sources lumineuses." Nancy 1, 1996. http://www.theses.fr/1996NAN10004.
The physical precision of simulations which permit the realistic visualization of a given geometric environnement depends on two factors: the precision of the physical model which describes the radiative properties of light sources (emittance) and surface (reflectance) of this environnement, and the precision of light propagation calculations between these surfaces. The work of my thesis presented here consists of defining a model for light source which permits the simulation of complex lighting system. This model takes into account any arbitrary type of spectral distributions (continuous or non-continuous) and spatial distributions (uniform or non-uniform). - In image synthesis technology today, the spectral characteristics of light sources are still often modelized in the RGB colorimetric system. This colorimetric system does not allow us to obtain precise simulations from given spectral data because it depends on display device. Methods have been recently developed to sample the wavelength domain and calculate the light propagation from this set of samplesj which however, do not permit the treatment of complex spectral characteristics. To solve this problem, we have proposed a method based upon preliminary analyse of spectrums utilized. This method removed certain constraints imposed by actual methods. -To take into account the spatial energy distribution of light sources in the illumination calculations, classical methods assume that the distributions are uniform. This simplification is unjust since artificial sources never have a uniform spatial energy distribution. To simulate this type of light sources, models based upon gonio-photometric diagram provided by the manufacturers of lighting systems have been developed. However, these methods introduce an important error in the surface illumination calculation when sources are dose to the surface. This is why we have proposed a new method founded upon a precise geometric modelization of a light fixture (lamp, reflector, lens) and consider the source like a sub-domain of this environnement which emits energy by an intermediate interface zone. Inside this sub-domain, the spatial energy distribution is calculated on the interface zone by using a projection method. The two methods (spatial and spectral distributions) actually proposed in this thesis have been experimented and will be transferred into the industrial domain further developement
Cazier, Dorothée. "Modélisation et simulation des propriétés radiatives des surfaces : implantation et expérimentation." Nancy 1, 1996. http://www.theses.fr/1996NAN10116.
In the light transfer equation, we have to take into account the physical features of the material reflection. This have led many researchers to elaborate various models. These models are more or less physically valid; they are also more or less easy to use. In fact, on one hand they have to be processed by an algorithm of global lighting transfer between all surfaces of the geometrical environment to be simulated, and in the other hand they have to permit to determine parameters for the complex photometrical behavior of these surfaces. Our study concerns the modelisation of the radiative properties of surfaces. We focus more precisely on the properties measurement for real cases of surfaces, by taking into account these properties in the illumination simulation process and on the experimentation of a number of models, in the perspective of lighting engineering applications
Chepfer, Hélène. "Etude théorique et expérimentale des propriétés optiques et radiatives des cirrus." Lille 1, 1997. http://www.theses.fr/1997LIL10079.
La comparaison des différentes mesures avec les modeles montre que les données de polarisation (POLDER et lidar) sont très discriminantes pour la microphysique (forme, taille, orientation des cristaux), et que la combinaison de différentes mesures permet de réduire le nombre de modèles susceptibles de les expliquer. Une étude de sensibilité du forçage radiatif met en évidence l'impact important de l'orientation préférentielle des cristaux de glace dans le cirrus
Brogniez, Gérard. "Contribution à l'étude des propriétés optiques et radiatives des cirrus." Lille 1, 1992. http://www.theses.fr/1992LIL10116.
Julien, Vieaud. "Propriétés optiques effectives de films composites de polymère et de nanoparticules d'or." Phd thesis, Université Sciences et Technologies - Bordeaux I, 2011. http://tel.archives-ouvertes.fr/tel-00676817.
Vieaud, Julien. "Propriétés optiques effectives de films composites de polymère et de nanoparticules d’or." Thesis, Bordeaux 1, 2011. http://www.theses.fr/2011BOR14349/document.
By spectroscopic ellipsometry, we study the optical properties in the range of UV-Visible-Infrared of composites films made of polymer and gold nanoparticles. We study the relation between these measurement and the structure of the nanocomposites, that we study by atomic force microscopy in particular. We distinguish the analysis of thicks films (tridimensionals) and thins (quasi-bidimensionals). In both of case, we confronte these experimentals results to the theoric models of effectives medium derivated for Maxwell-Garnett in particular
Lallich, Sylvain. "Détermination expérimentale et modélisation des propriétés radiatives de matrices nanoporeuses de silice." Phd thesis, INSA de Lyon, 2009. http://tel.archives-ouvertes.fr/tel-00397453.
Chartier, Céline. "Propriétés physiques et radiatives du luminophore vert SrGa2S4 : eu2+ en couche mince." Paris 6, 2003. http://www.theses.fr/2003PA066417.