Littérature scientifique sur le sujet « Optimisation couche par couche »
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Articles de revues sur le sujet "Optimisation couche par couche"
Ourahmoun, Ourida. « Les cellules solaires à base de matériaux pérovskites - Structures et performances ». Journal of Renewable Energies 21, no 4 (31 décembre 2018) : 515–20. http://dx.doi.org/10.54966/jreen.v21i4.709.
Texte intégralSingh, Bhawan, et John E. Lewis. « Appauvrissement de la couche neigeuse en hiver dans une forêt de feuillus, mont Saint-Hilaire, Québec ». Géographie physique et Quaternaire 34, no 2 (28 janvier 2011) : 247–51. http://dx.doi.org/10.7202/1000402ar.
Texte intégralBolle, B., A. Tidu et J. J. Heizmann. « Analyse par diffraction des rayons X d'une couche de laiton obtenue par dépôt d'une couche de cuivre, d'une couche de zinc et diffusion ». Le Journal de Physique IV 08, PR5 (octobre 1998) : Pr5–69—Pr5–76. http://dx.doi.org/10.1051/jp4:1998510.
Texte intégralEl motassadeq, Ahmed, Hassan Chehouani, Mohamed Waqif et Sauveur Benet. « Simulation et Visualisation de la Couche Limite Thermique au-Dessous d’un Disque Horizontal ». Journal of Renewable Energies 3, no 1 (30 juin 2000) : 57–69. http://dx.doi.org/10.54966/jreen.v3i1.911.
Texte intégralAudaire, L., P. Agnèse, Ph Rambaud et M. Pirot. « Détection infrarouge par ferroélectriques en couche mince ». Journal de Physique III 4, no 7 (juillet 1994) : 1219–30. http://dx.doi.org/10.1051/jp3:1994197.
Texte intégralBergot, Thierry. « Stratosphère et couche d'ozone - Par Gérard Mégie ». La Météorologie 8, no 7 (1994) : 88. http://dx.doi.org/10.4267/2042/53449.
Texte intégralDe Montigny, Francine, Sabrina Zeghiche et Pascale De Montigny-Gauthier. « Le décès périnatal comme bifurcation temporelle : les parcours de vie de femmes après une fausse couche ». Aporia 12, no 1 (26 août 2020) : 36–46. http://dx.doi.org/10.18192/aporia.v12i1.4836.
Texte intégralBenderradji, Razik, Hamza Gouidmi et Abdelhadi Beghidja. « Etude numérique de transition RR / MR dans l’interaction onde de choc / choc de compression ». Journal of Renewable Energies 19, no 4 (17 octobre 2023) : 595–604. http://dx.doi.org/10.54966/jreen.v19i4.597.
Texte intégralSegura, Agnès, et Denis Mellier. « Effraction des enveloppes psychiques lors d’une grossesse arrêtée spontanément : entre rigidité et perméabilité, quel destin de la sexualité féminine lors de la grossesse suivante ? » Corps & ; Psychisme N° 80-81, no 1 (1 septembre 2023) : 79–91. http://dx.doi.org/10.3917/cpsy2.081.0079.
Texte intégralGarcia, Jesús Villalobos, Claire Vialle, Caroline Sablayrolles, Mireille Montrejaud-Vignoles, Jean-Philippe Amalric, Matthias Desmolles, Christian Vignoles, Patrice Gallien et Claire Albasi. « Étude de la performance du milieu filtrant constitué d’une couche de chènevotte sur une couche de grignons d'olives dans le traitement des eaux usées domestiques : du pilote à l’échelle industrielle ». Revue des sciences de l’eau 32, no 1 (15 mai 2019) : 1–10. http://dx.doi.org/10.7202/1059876ar.
Texte intégralThèses sur le sujet "Optimisation couche par couche"
Szarpak, Anna. « Microcapsules multicouches à base d'acide hyaluronique comme transporteurs potentiels de médicaments : synthèse, caractérisation et optimisation de propriétés ». Phd thesis, Université Joseph Fourier (Grenoble), 2009. http://tel.archives-ouvertes.fr/tel-00442324.
Texte intégralSzarpak, Anna. « Microcapsules multicouches à base d'acide hyaluronique comme transporteurs potentiels de médicaments : synthèse, caractérisation et optimisation de propriétés ». Phd thesis, Grenoble 1, 2009. http://www.theses.fr/2009GRE10084.
Texte intégralLn recent years, polyelectrolyte microcapsules prepared by the Layer-by-Layer deposition technique have attracted a great de al of interest for their potential applications in various fields such as drug delivery and biotechnology. One of the advantages of these multicompartment systems is the possibility to introduce a high degree of multifunctionality within their nanoshell due to the nature of the materials and assembly conditions used for their preparation. The latter rely on the sequential adsorption of oppositely charged materials onto a colloid template, followed by its dissolution. For biomedical applications, nano-/microcapsules built from biocompatible, biodegradable and non toxic polymers are a prerequisite. Ln this context, the aim of this work was to develop new LbL microcapsules made from hyaluronic acid (HA), a naturally occurring polysaccharide. First, optimization of synthetic conditions for preparing microcapsules from HA and PAH was carried out. CaC03 particles were used as the sacrificial template. Assembly, using a solution of high molecular HA (Mw = 820 OOOg/mol), at a concentration higher than the overlap concentration, lead to stable capsules. Ln the second step, synthetic PAH was replaced by biocompatible cationic polymers: a polypeptide, poly(L-lysine (PLL) or a quatemized derivative of chitosan (QCH) from polysaccharide family. The influence of the polycationic partner on the morphology, stability, permeability properties and enzymatic degradation of microscapsules was analyzed. Those properties were then tuned by shell cross¬linking. The encapsulation of dextran (Mw = 4000g/mol) release as a model drug was demonstrated
Mahmood, Asad. « Algorithmes d'adaptation pour la couche physique de systèmes multi-porteuses ». Phd thesis, Télécom ParisTech, 2008. http://pastel.archives-ouvertes.fr/pastel-00004691.
Texte intégralMahmood, Asad. « Algorithmes d'adaptation pour la couche physique de systèmes multi-porteuses ». Phd thesis, Paris, ENST, 2008. https://pastel.hal.science/pastel-00006156.
Texte intégralThe main objective of our thesis was to reduce the complexity of the existing adaptive algorithms for multi-carrier systems, both, from a theoretical/algorithmic perspective as well as taking advantage from the adaptive nature of the state-of-the-art under-lying implementation platforms. To reach this main objective, adaptation was performed both from an algorithmic as well as an architectural point of view. From an algorithmic perspective, an insight into the inherent pattern, which exists in the optimal bit-allocation procedure and based upon this pattern the design of a Novel Optimal Discrete Bit Loading algorithm was performed which has a complexity significantly lower than existing algorithms for discrete bit-loading. Then optimizing the parameter of allocated power, theoretical developments for an optimal power-allocation including the Peak-Power Constraint and the design of a novel algorithm for Peak-Power Constrained Optimal Power Allocation was performed which involves a complexity significantly lower than the classical method of Iterative- Water-filling, which is conventionally employed for such constrained power allocations. Then, targeting channel coding, a proposal of the design and optimization of Finite-Length Irregular LDPC Codes, was made based on the Wave-Quantization methodology. Finally, a methodology to tune the hardware resources of a flexible underlying architecture (e. G. FPGA) at run-time based upon the needs of the channel and system is proposed. This results in the use of the link-adaptation algorithms at those ranges of Doppler-frequencies/user-mobility, which are not possible to operate upon, otherwise
Barreiros, Salvado Miguel. « Optimisation des transports dans la couche active de PEMFC par une approche couplée modélisation/caractérisation : augmentation des performances des couches actives aux hautes densités de courant ». Thesis, Université Grenoble Alpes, 2021. http://www.theses.fr/2021GRALI016.
Texte intégralPEMFCs are among the most promising technologies for the future of the automotive industry. However, major barriers must be overcome in order to achieve a solid position in the electric vehicle market. These include the cost, where a significant fraction can be attributed to the employment of Pt in the catalyst layers.In the region of high current densities, a steep drop is commonly observed and it is usually associated with ionic and mass transport limitations in the cathode catalyst layer (CCL). Therefore, simultaneously reducing the Pt loading and improving the performance at high current density requires at first an identification of the main source(s) of performance limitations. Since the CCL is a highly heterogeneous material with features of disparate length scales, a multiscale imaging characterization setup is required in order to analyze its structure.In this work, a framework including multiscale electron microscopy (EM) characterization and multiscale modeling has been developed. Such framework allows reproducing real 3D CCL geometries using an innovative reconstruction algorithm that was designed for the purpose. Moreover, a physical model is implemented in these 3D geometries, and subsequently, numerical simulations at the local and CCL scales are performed. The multiscale EM setup includes FIB-SEM from which the carbon phase distribution is determined, HAADF-STEM to determine the representative Pt particle size distribution, and finally, HRTEM from which an average thickness for the Nafion thin film is measured. These images go through a post-treatment procedure which includes segmentation and alignment for the tomographic images. From these, geometries are then reproduced. Moreover, a physical model including multispecies transport on the Nafion and pore phases, ionic transport on the Nafion phase and a Butler-Volmer law at the Pt interface to describe the ORR kinetics, is implemented. The CCL 3D model is then coupled with a 2D MEA-scale model, from which local conditions are extracted and subsequently used as input in the local model. An analysis on the 3D geometries is then performed at both local and CCL scales. Regarding the former, it is found that structures with smaller Pt particles always present a better performance due to an increase in the amount of surface available for the electrochemical reaction to proceed. Though, the presence of Pt particles in large Nafion agglomerations as well as Pt interparticle competition effects can play a major detrimental role on performance (differences in local performance up to 26%). In the CCL scale analysis, the effects of the Pt particle size, the Nafion layer thickness and carbon aggreggate size are analyzed. In accordance to what is observed at the local scale, structures with smaller particles also display a better performance. Regarding the Nafion layer thickness, a balance between an enhancement in ionic transport and an increased resistance to oxygen transport upon thickening of the Nafion film has been highlighted. Results show that increasing the Nafion layer thickness from 8 to 10 nm is only benefitial for performance when the porosity is above 30%. Furthermore, these support the fact that understanding the swelling behavior of the Nafion thin film is crucial for a more accurate determination of the CCL's response. In its turn, enlarging the carbon aggregates can be detrimental for performance since some pores may vanish and regions with Pt particles located on large Nafion agglomerations may become starved from oxygen. Finally, the impact of the structure arrangement has been analyzed and gains in performance upon minimizing the tortuosities of both Nafion and pore phases to unity have been quantified. An improvement in performance of 25% was found, mainly as a result of the favoured ionic transport
Van, Gorp Adrien. « Optimisation du temps de cycle d'injection de pièces plastiques ». Compiègne, 2007. http://www.theses.fr/2007COMP1722.
Texte intégralIn plastic injection, the mold must be designed to increase the heat fluxes leading to the cooling time. Firstly, this work is focused on the heat exchange between the mold and the cooling fluid. A technical solution is proposed to reduce the sub-layer which indues a heat fluxes limitation. Experimental results and numeric simulations show that exchange is increased about 7%. Next, the influence of 4 process parameters is studied on the polymeric material (characterized by means of shrinkage and hardness measurements) and on the gloss and roughness of injected parts surface. Results lead to a main effect of injection temperature and velocity. These effects on the material are linked with the cristallinity promoted by the injection temperature. The main effect on the surface is explained by the evolution of the polymer viscosity during the injection phase. Globally, it seems to be important to take into account the different physical phenomena in the cycle rime optimization by modifying the injection parameters
Rouissi, Fatma. « Optimisation de la couche PHY des systèmes de communication sur le réseau d'énergie en présence de bruit impulsif ». Thesis, Lille 1, 2008. http://www.theses.fr/2008LIL10042/document.
Texte intégralThis thesis deals with the study and the suggestion of new solutions to improve high bit rate power line communications. A special interest is given to impulsive noise presence which is the most difficult transmission constraint to overcome. The first aim of this work is to analyze statistically measure results then to propose a simple and efficient noise model that will be used in a simulation tool to define accurately suitable noise cancellation techniques. Experimental measurements done in both Indoor and vehicle PLC channels allowed to deduce noise characteristics in the two environments, to compare these characteristics and to prove high effect of Indoor impulsive noise. ln next step, three models were studied: c1ass A of Middleton mode 1, Markov chains-based model and the stochastic approach. Then, a new hybrid model, that combines the stochastic approach and Markov chains, was proposed. This model is simple, easy to implement and allows a satisfying fitting to noise temporal characteristics. Comparisons of models to measured noise show the efficiency of the hybrid approach that will be used afterward. The second aim of this work is to defme new appropriate and cost-effective methods to compensate impulsive noise effect. The frrst solution is to add a noise canceller module in the PLC system receiver. This solution was studied by proposing techniques to cancel noise by estimating its power. The second solution is to use error correction methods. ln this case, three channel coding structures were developed and their performances were studied in the presence of different impulsive noise scenarios
Chalvin, Maxime. « Fabrication additive de tubulures par dépôt de fil robotisé multi-axes : génération et optimisation de trajectoires ». Electronic Thesis or Diss., Toulon, 2020. http://www.theses.fr/2020TOUL0010.
Texte intégralAdditive manufacturing through Directed Energy Deposition (DED) enables small batches of parts to be rapidly manufactured. However, manufacturing trajectories usually used for the manufacture of overhanging parts require the use of supports, material which is not useful for the finished part and time consuming. If multi-axis trajectories can be used to avoid them, they present generally a heterogeneous local inter-layer distance, thus requiring a variation of the deposition parameters to adapt the layer height ; variation that can be harmful to the mechanical characteristics of the final part. This thesis first proposes a constant local inter-layer trajectory generation method for DED additive manufacturing of tubular parts defined by parametric curves and which can have profile radius variations. The proposed trajectories have been validated by robotized manufacturing trials of polymer parts. Since the rotation about a coaxial deposition tool axis has no impact on the deposit, the use of 6-axis robots offers a redundancy. Using this redundancy, a layer by layer optimization of the trajectory in the robot space is then proposed. In a constrained robot configuration, the trajectory optimization allows the manufacturing of parts that cannot be manufactured in the usual way, and improves the geometrical quality of the parts with a better repeatability
Hildebrandt, Thibaud. « Optimisation des interfaces absorbeur/couche tampon/fenêtre avant dans les cellules solaires à base de Cu(In,Ga)Se2 ». Thesis, Paris 6, 2014. http://www.theses.fr/2014PA066720.
Texte intégralThe replacement of CdS-based buffer layer in Cu(In,Ga)Se2 solar cells has been one of the main challenges of the research community for the last decade. Today, one of the most promising alternative material is the chemically bath deposited Zn(S,O,OH). Because of its low deposition rate and of metastable behavior, it becomes necessary to proceed to an optimization of experimental conditions and of the various interfaces. The first part of this work has been dedicated to the optimization of the deposition bath thanks to the introduction of new additives. It has been possible to underline the additive effects on both the deposition rate and on the chemical composition of the deposited layers. The second part of this work has been dedicated to the optimization of the (Zn,Mg)O/ZnO:Al window layer. Thanks to an improvement of the sputtering conditions, it has been possible to reduce metastability of the solar cells, and to limit sodium migration up to the Zn(S,O,OH) layer. These optimized conditions combined to the variation of the CIGSe surface composition have allowed us to outperform CdS-based references solar cells
Thomasson, Alexandre. « Ordres électriques et magnétiques dans le composé magnétoélectrique GaFeO3 : optimisation par dopage ». Phd thesis, Université de Strasbourg, 2013. http://tel.archives-ouvertes.fr/tel-01065858.
Texte intégralLivres sur le sujet "Optimisation couche par couche"
Société de développement de la Baie James. Repérage par télédétection des zones d'agrégats recouverts par une mince couche d'argile, phase 2, projet no 4040. Sainte-Foy, Qué : Service canadien des forêts, Région du Québec, 1995.
Trouver le texte intégralMeunier-Berthelot, Claude. Le Trompe-l'oeil de l'éducation : La dernière couche par Claude Allègre, le vernissage par Jack Lang. Editions des Ecrivains, 2000.
Trouver le texte intégralBentouba, Said. Optimisation d’un Système Photovoltaïque en Couche Mince : Intégration d'un Onduleur Multi Niveaux et Comparaison entre MPPT. Omniscriptum, 2014.
Trouver le texte intégralERIC, A. B. Sécurité Couche Deux Dans un Réseau d´Entreprise Optimisé : Optimisation Avec les VLANs, les Risques d'Attaque Dans les Commutateurs,déploiement de la Solution de Sécurité , ACL. Independently Published, 2020.
Trouver le texte intégralPreserving the ozone layer : A first step. A report on options for meeting Canada's obligations under the Montreal Protocol on Substances that Deplete the Ozone Layer = La preservation de la couche d'ozone, une premiere etape. Rapport sur les options permettant de respecter les engagements contractes par le Canada en vertu du Protocole de Montreal relatif aux substances qui appauvrissent la couche d'ozone. Ottawa : Environment Canada, 1988.
Trouver le texte intégralKulak, Dariusz. Wieloaspektowa metoda oceny stanu gleb leśnych po przeprowadzeniu procesów pozyskania drewna. Publishing House of the University of Agriculture in Krakow, 2017. http://dx.doi.org/10.15576/978-83-66602-28-1.
Texte intégralChapitres de livres sur le sujet "Optimisation couche par couche"
Marret, H., H. Guyot, J. Wagner-Ballon et A. M. Lehr Drylewicz. « Elle a fait une fausse couche spontanée (FCS) ou une interruption volontaire de grossesse (IVG) traitée par curetage. Comment la suivre à domicile ? » Dans 120 questions en gynécologie-obstétrique, 44–46. Elsevier, 2009. http://dx.doi.org/10.1016/b978-2-294-70459-8.00012-x.
Texte intégralJadeja, Yagna, Mahmoud Shafik et Paul Wood. « Computer Aided Design of Self-Learning Robotic System Using Imitation Learning ». Dans Advances in Transdisciplinary Engineering. IOS Press, 2022. http://dx.doi.org/10.3233/atde220564.
Texte intégralActes de conférences sur le sujet "Optimisation couche par couche"
Absi, Rafik, et Michel Bélorgey. « Modélisation de la couche limite de fond générée par un écoulement de houle ». Dans Journées Nationales Génie Côtier - Génie Civil. Editions Paralia, 1998. http://dx.doi.org/10.5150/jngcgc.1998.002-a.
Texte intégralBELORGEY, Michel, et Martin SANCHEZ. « Interactions entre les accélérations convectives et la turbulence dans une couche limite générée par la houle ». Dans Conférence Méditerranéenne Côtière et Maritime - Coastal and Maritime Mediterranean Conference. Editions Paralia, 2017. http://dx.doi.org/10.5150/cmcm.2017.041.
Texte intégralLoiseau, Fabrice, Denis Tcheukam-Toko et François Marin. « Simulation de la couche limite instationnaire générée par un écoulement de houle sur un fond lisse ». Dans Journées Nationales Génie Côtier - Génie Civil. Editions Paralia, 1996. http://dx.doi.org/10.5150/jngcgc.1996.001-l.
Texte intégralBillere, Olga. « La reconnaissance et différenciation des formes proverbiales ». Dans Language for International Communication. University of Latvia Press, 2023. http://dx.doi.org/10.22364/lincs.2023.15.
Texte intégralCatros, S. « A quoi servent les Bio-Imprimantes 3D ? » Dans 66ème Congrès de la SFCO. Les Ulis, France : EDP Sciences, 2020. http://dx.doi.org/10.1051/sfco/20206601012.
Texte intégralLandric, C., C. Alande et M. Ndiaye. « Apport de la greffe gingivale épithélio conjonctive dans la reconstruction palpébrale ». Dans 66ème Congrès de la SFCO. Les Ulis, France : EDP Sciences, 2020. http://dx.doi.org/10.1051/sfco/20206602014.
Texte intégralKröger, Georg, Rainer Schnell et Nicholas D. Humphreys. « Optimised Aerodynamic Design of an OGV With Reduced Blade Count for Low Noise Aircraft Engines ». Dans ASME Turbo Expo 2012 : Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/gt2012-69459.
Texte intégralGeorgakis, C., C. Whitney, G. Woollatt, V. Stefanis et P. Childs. « Turbine Stator Well CFD Studies : Effect of Upstream Egress Ingestion ». Dans ASME Turbo Expo 2007 : Power for Land, Sea, and Air. ASMEDC, 2007. http://dx.doi.org/10.1115/gt2007-27406.
Texte intégralAlmer, Alexander, Anna Weber, Florian Haid, Julia Tschuden, Lucas Paletta, Michael Schneeberger, Dietmar Wallner et al. « Physiological and cognitive real-time stress analysis as a basis for optimised human-machine teaming and safe decision processes for military forces ». Dans 5th International Conference on Human Systems Engineering and Design : Future Trends and Applications (IHSED 2023). AHFE International, 2023. http://dx.doi.org/10.54941/ahfe1004151.
Texte intégralRapports d'organisations sur le sujet "Optimisation couche par couche"
Warin, Thierry, Nathalie de Marcellis-Warin et Robert Normand. Mieux comprendre le niveau d’adoption Des cryptoactifs au Québec. CIRANO, novembre 2022. http://dx.doi.org/10.54932/cswf3465.
Texte intégralGuidati, Gianfranco, et Domenico Giardini. Synthèse conjointe «Géothermie» du PNR «Energie». Swiss National Science Foundation (SNSF), février 2020. http://dx.doi.org/10.46446/publication_pnr70_pnr71.2020.4.fr.
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