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Artykuły w czasopismach na temat "Densité de puissance absorbée"
Gallais, Laurent, i Laurent Lamaignère. "L’endommagement laser sur les lasers de puissance". Photoniques, nr 118 (2023): 46–52. http://dx.doi.org/10.1051/photon/202311846.
Pełny tekst źródłaGuéranger, David, i François-Mathieu Poupeau. "Un outil qui résiste à sa réforme. Le COS et sa « carrière » dans le Plan local d’urbanisme de Paris". Environnement Urbain 3 (6.07.2009): 1–9. http://dx.doi.org/10.7202/037597ar.
Pełny tekst źródłaCeneno, Jorge Antonio Silva, Regina Tiemy Kishi i Edson Aparecido Mitishita. "Detection of areas for rainwater harvesting using airborne laser scanner and aerial imagery". Revue Française de Photogrammétrie et de Télédétection, nr 198-199 (21.04.2014): 25–29. http://dx.doi.org/10.52638/rfpt.2012.68.
Pełny tekst źródłaColliot-Thélène, Catherine. "Individu et individualisme chez Georg Simmel, au prisme de Durkheim et de Weber". Sociologie et sociétés 44, nr 2 (31.10.2012): 207–33. http://dx.doi.org/10.7202/1012927ar.
Pełny tekst źródłaVirol, M. "Connaître et accroître les peuples du royaume : Vauban et la population". Population Vol. 56, nr 5 (1.05.2001): 845–75. http://dx.doi.org/10.3917/popu.p2001.56n5.0875.
Pełny tekst źródłaAoudjehane, Malika, Aimad Chafou, Amara Kellil i Yves Aurelle. "Traitement d'une émulsion d'huile de coupe par electrocoagulation avec des electrodes de fer". Water Quality Research Journal 45, nr 4 (1.11.2010): 499–508. http://dx.doi.org/10.2166/wqrj.2010.048.
Pełny tekst źródłaMathieu, Marie-Eve. "Diabetaction – Programme d’exercices pour personnes diabétiques de type 2 ou à risque : effets sur la pratique d’activités physiques, la condition physique, la qualité de vie et différents paramètres de santé". Applied Physiology, Nutrition, and Metabolism 33, nr 6 (grudzień 2008): 1259–60. http://dx.doi.org/10.1139/h08-100.
Pełny tekst źródłaAl Zohbi, Ghida, Patrick Hendrick i Philippe Bouillard. "Evaluation du potentiel d’énergie éolienne au Liban". Journal of Renewable Energies 17, nr 1 (19.10.2023). http://dx.doi.org/10.54966/jreen.v17i1.425.
Pełny tekst źródłaZerbo, Issa, Martial Zoungrana, Ahmed Douani Seré, Francois Ouedraogo, Raguilignaba Sam, Bernard Zouma i François Zougmoré. "Influence d’une onde électromagnétique sur une photopile au silicium sous éclairement multi spectral en régime statique". Journal of Renewable Energies 14, nr 3 (24.10.2023). http://dx.doi.org/10.54966/jreen.v14i3.278.
Pełny tekst źródłaSoulouknga, Marcel Hamda, Dieudonné Kidmo Kaoga, Noël Djongyang i Serge Yamigno Doka. "Comparaison du potentiel énergétique éolien des trois zones climatiques du Tchad". Journal of Renewable Energies 19, nr 1 (17.10.2023). http://dx.doi.org/10.54966/jreen.v19i1.547.
Pełny tekst źródłaRozprawy doktorskie na temat "Densité de puissance absorbée"
Jafari, Seyedfaraz. "Near-field millimeter-wave radio-frequency exposure analysis". Electronic Thesis or Diss., Institut polytechnique de Paris, 2023. http://www.theses.fr/2023IPPAT034.
Pełny tekst źródłaThis thesis aims to determine the absorbed power density (APD) considering the coupling and multiple reflections between the antenna and the human body, which poses challenges in assessing APD due to their close proximity.The first part of the thesis explores the concept of measuring APD inside a skin tissue phantom, specifically focusing on its application in 5G technologies.However, measuring APD inside the skin tissue phantom is limited due to the shallow penetration depth of fields at millimeter and quasi-millimeter waves. To overcome this limitation, a reconstruction technique is employed, utilizing the backward plane-wave spectrum(PWS) method. The electric field is sampled at a specific distance within the phantom, enabling the determination of APD at the human skin surface.In the second part, a non-invasive approach based on the dyadic Green's function (DGF) is proposed for APD assessment. This method takes into account the coupling between the human skin model and the device under test (DUT). The entire space is dividedinto two half-spaces : the upper half-space (z > 0) is filled with air, where the antenna is positioned, and the lower half-space is filled with an equivalent human skin liquid or solid. The electric field integral equation (EFIE), based on spatial DGFs, is solved using the method of moments (MoM) to reconstruct the equivalent currents. The electric field is sampled on the surface of a hemisphere surrounding the antenna, and the APD is evaluated based on the reconstructed equivalent currents beneath the air-phantom interface.In addition to the proposed techniques, the thesis investigates the measurement requirements for both approaches, including E-field measurement uncertainty, sampling angular resolution, and the required size of the phantom.The findings demonstrate that the proposed techniques present a novel methodology for assessing APD, taking into consideration the coupling between the human body and the antenna, particularly in the context of exposure to handheld devices operating above 6GHz
Bendjebara, Naïla. "Evaluation et caractérisation statistique de la puissance absorbée par la tête d'un utilisateur sujet au rayonnement radiofréquence d'un téléphone mobile". Paris 6, 2002. http://www.theses.fr/2002PA066033.
Pełny tekst źródłaMohamed, Massoud Abdelaal Magdy. "Modélisation et caractérisation de la densité de puissance électromagnétique déposée dans des charges mobiles". Toulouse, INPT, 1999. http://www.theses.fr/1999INPT022H.
Pełny tekst źródłaEssadaoui, Jamila. "Commande d'un onduleur de puissance destiné au chauffage par induction par la modulation de densité d'impulsion avec amélioration du facteur de puissance". Thèse, Université du Québec à Trois-Rivières, 2003. http://depot-e.uqtr.ca/4535/1/000105149.pdf.
Pełny tekst źródłaGeeraert, Nausikaa. "Evaluation quantitative de tissu fibroglandulaire pour l'estimation de l'énergie absorbée différenciée par tissu en tomosynthèse du sein". Thesis, Paris, ENST, 2014. http://www.theses.fr/2014ENST0060/document.
Pełny tekst źródłaIn this research project the main goals were a) to implement a method for the computation of the volumetric breast density (VBD), and b) to propose an improved quantity for the assessment of individual radiation-induced risk, in particular during mammography, together with a method to quantify it. The breast density is known as a breast cancer risk factor. The objective quantification of the volumetric breast density was developed, based on already published methods, and improved. The method was implemented for two mammography systems. It is based on the calibration of the mammography system acquisition chain with breast equivalent phantoms and computes a breast density map. Our most important contribution resides in a new validation method applicable to any VBD computation, consisting in comparing its results with the VBD obtained from a thorax CT examination for the same patient. This validation method was applied to our VBD computation. We found an average deviation between mammography and CT of less than 10%. Our results are comparable to the state-of-the-art results for other validation methods. For the individual radiation risk, we proposed to replace the average glandular dose by the imparted energy, which depends on the quantity and distribution of the glandular tissue, which is the tissue at risk. The volumetric imparted energy is computed from Monte Carlo simulations. The VBD, computed for the 0° projection of tomosynthesis exams, helps us to localize the glandular tissue and to attribute the imparted energy to the different tissues. A proposition was implemented for geometric phantoms, a textured phantom and a patient case
Geeraert, Nausikaa. "Evaluation quantitative de tissu fibroglandulaire pour l'estimation de l'énergie absorbée différenciée par tissu en tomosynthèse du sein". Electronic Thesis or Diss., Paris, ENST, 2014. http://www.theses.fr/2014ENST0060.
Pełny tekst źródłaIn this research project the main goals were a) to implement a method for the computation of the volumetric breast density (VBD), and b) to propose an improved quantity for the assessment of individual radiation-induced risk, in particular during mammography, together with a method to quantify it. The breast density is known as a breast cancer risk factor. The objective quantification of the volumetric breast density was developed, based on already published methods, and improved. The method was implemented for two mammography systems. It is based on the calibration of the mammography system acquisition chain with breast equivalent phantoms and computes a breast density map. Our most important contribution resides in a new validation method applicable to any VBD computation, consisting in comparing its results with the VBD obtained from a thorax CT examination for the same patient. This validation method was applied to our VBD computation. We found an average deviation between mammography and CT of less than 10%. Our results are comparable to the state-of-the-art results for other validation methods. For the individual radiation risk, we proposed to replace the average glandular dose by the imparted energy, which depends on the quantity and distribution of the glandular tissue, which is the tissue at risk. The volumetric imparted energy is computed from Monte Carlo simulations. The VBD, computed for the 0° projection of tomosynthesis exams, helps us to localize the glandular tissue and to attribute the imparted energy to the different tissues. A proposition was implemented for geometric phantoms, a textured phantom and a patient case
Moulin, Cécile. "Élaboration de monocristaux de carbure de silicium pour l’électronique de puissance : réduction de la densité de défauts". Grenoble INPG, 2001. http://www.theses.fr/2001INPG0150.
Pełny tekst źródłaSilicon carbide is a very promising material for high power applications. Today, significant improvements in both SiC wafer size and quality are still necessary to allow a fast development of silicon carbide in Europe. SiC single crystals are grown by a sublimation technique, and still contain several kind of defects usually detrimental for devices applications. A better understanding of the SiC sublimation growth has to be pursued to improve the material quality. First of all, several characterization techniques have been selected to establish relationships between the substrates characteristics and the growth process parameters. Then, a study on the start of growth has been undertaken. It shows that great care must be taken during the initial steps of the growth process in terms of pressure and temperature to avoid the deterioration of the speed surface, and to promote a lateral growth mechanism. This previous work is followed by a study combining growth, characterization and simulation results. The influence of several growth parameters such as the thermal gradients inside the cavity, or the influence of the argon pressure on crystals characteristics is studied and quantified. Results show how the material characteristics are sensitive to small parameters variations, and how it can be deteriorated (polytype switching, droplets…) by minor variations of temperature compared to the working temperatures. An evaluation of the process non-reproducibility, related to this extremely high sensibility of the thermal conditions, is also presented. Then, the structural characteristics of the ingots are studied and the silicon carbide growth mechanism is presented. Finally, first results on the substrate characteristics influence on the diodes electrical performances conclude this work
Mouty, Stéphane. "Conception de machines à aimants permanents à haute densité de couple pour les éoliennes de forte puissance". Thesis, Besançon, 2013. http://www.theses.fr/2013BESA2034/document.
Pełny tekst źródłaGiven the European guidelines, which consist into producing 20% of the energy from renewable sources, the governments are obliged to invest in new types of production systems. An energy market survey will show the part of renewable energy in the energy consumption. After the hydroelectric systems, the wind turbines are the most common systems using renewable sources. The current objectives have led to consider the installation of offshore wind turbine. The specific limitations led the market players to develop new systems with adapted generators: direct drive permanent magnet generator. Model of the permanent magnet machines is described. First a conventional machine topology is presented, then other solutions will be studied with the objective of increasing the torque density. One of them is the concentrated winding machines where the end winding overlapping is avoided. On the other hand, use multiphase system becomes very interesting in order to increase system reliability and work in fault tolerant modes. The strategy that was adopted for the design of the generator to fit the best the specification is also discussed as well as the results of the tests. At the end, the wind turbine equipped with this alternator, has a power density at least 15% higher than the 2013’s available solutions
Lassoued, Salima. "Modélisation de la densité de courant de saturation base-émetteur d'un transistor bipolaire de puissance : effets des forts dopages". Toulouse, INPT, 1992. http://www.theses.fr/1992INPT051H.
Pełny tekst źródłaDerkaoui, Nadira. "Etude des plasmas micro-ondes à haute densité de puissance en systèmes H₂-CH₄ et H₂-CH₄-B₂H₆". Paris 13, 2012. http://scbd-sto.univ-paris13.fr/intranet/edgalilee_th_2012_derkaoui.pdf.
Pełny tekst źródłaThis thesis deals with high power density microwave plasmas of H₂/CH₄and H₂/CH₄ et H₂/CH₄/B₂H₆ mixtures used for growing intrinsic and boron-doped diamond films. The aim of this work is to understand phenomena occurring in the plasma phase and near the plasma/surface interface for high power and high pressure (high power density) in order to overcome the technological limits of the reactors in terms of growth rates for constant quality (in particular purity) and deposition area. This study is based on an approach coupling experiments and modeling that allows, on the one hand the description of the plasma physics and on the other hand, the validation of a 1D model previously developed at LSPM and adapted to the new reactor geometry that has been used for high power density conditions. Evolutions of electron, hydrogen and methyl densities as well as the gas and electronic temperatures are analyzed in relation to process parameters (flow rate, power, pressure, CH₄ %. . . ). Experimental measurements are carried out by actinometry, OES and microwave interferometry and are completed by TALIF. On the whole, comparisons between model and experiments are in good agreement but some limits of the model have been highlighted, e. G. Ionization processes. Moreover, a quasi linear relation has been established between the single diamond growth rate and the hydrogen density of the plasma. Finally, a kinetic scheme for H₂-CH₄-B₂H₆ plasmas is implemented in the 1D model, taking into account 21 reactions and 7 boron containing species, in order to study boron-doped diamond processes