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Artykuły w czasopismach na temat "Diagnostic micro-ondes"
Sayag, David. "Les tumeurs hépato-biliaires chez le chien et le chat". Le Nouveau Praticien Vétérinaire canine & féline 20, nr 84 (2023): 36–48. http://dx.doi.org/10.1051/npvcafe/2023024.
Pełny tekst źródłaRozprawy doktorskie na temat "Diagnostic micro-ondes"
Antunes, Neves Ana Luisa. "Application au domaine biomédical des moyens de caractérisation électromagnétique de matériaux dans le spectre des micro-ondes". Thesis, Aix-Marseille, 2017. http://www.theses.fr/2017AIXM0320/document.
Pełny tekst źródłaThe penetration capacity of the electromagnetic (EM) waves in matter or biological tissues allows exploring media non-destructively. Concerning the public health sector, improving the quality of life has become one of the greatest concerns of nowadays society. EM wave research on different media and biological tissues shows a great potential for diagnostic applications and eventually for therapeutically applications. In this doctoral thesis, we focus on the vast domain of the biomedical applications of wave-matter interactions, based on the knowledge of the electromagnetic properties of matter, the complex permittivity and the conductivity. On a first instance, we address the emerging domain of ultra-high field MRI (Magnetic Resonance Imaging), which nowadays puts effort into the clinical implementation of 7T devices. Firstly our purpose is to produce an anthropomorphic head model, composed of the brain’s different layers, and taking into account the electromagnetic properties and the proton relaxation times inherent to each tissue. These realistic head models allow to evaluate the newly developed protocols for these ultra-high field devices. Secondly, we have studied and developed field homogenization devices, which allow brightening the shadow areas displayed in some MRI images, such as the cerebellum and the temporal lobes in brain imaging at 7T. This procedure, named Passive Shimming, is based on the use of high permittivity dielectric pads composed of Barium Titanate, which focalize the field to the areas where normally the wavelength in insufficient to generate a homogeneous signal distribution
Tretinnikov, Pavel. "New developments on the interpretative model of ITER diagnostics using microwaves". Electronic Thesis or Diss., Université de Lorraine, 2023. http://www.theses.fr/2023LORR0027.
Pełny tekst źródłaThe turbulence in thermonuclear fusion plasma can lead to increase of the plasma transport coefficient that enhances the particles and energy losses therefore deteriorates the plasma confinement. That is why measurements of the plasma turbulence is important for description of the plasma transport processes. Microwave plasma diagnostics is an efficient kind of the active plasma diagnostics to characterize the turbulence. Their principles are based on the collection of information integrated over the probed plasma volume, and printed on the reflected or scattered waves reaching the detector, for which interpretative models are required to extract the turbulence properties. The radial correlation reflectometry (RCR) and the Doppler reflectometry are widely used technics that provide information on plasma turbulence characteristics. The Collective Thomson Scattering (CTS) is a valuable microwave diagnostic that can give the information about such plasma parameters as the bulk ion temperature, bulk ion composition, the fast particles (alpha particles or ions of a heating beam) velocity distribution. The knowledge of the alpha particle velocity distribution is especially interesting and important to evaluate the ITER performance where the energy amplification of plasma heating power Q is expected to achieve the value about 10. The actual data analysis of the microwave diagnostics, or interpretations of a measured signal is fulfilled assuming a smooth Gaussian probing beam. It was demonstrated that the microwave beams can be significantly distorted due to the edge plasma turbulence, that may lead to misleading interpretations of the diagnostic signal, based on the microwaves, so the diagnostics interpretative models should be analyzed taken into account to the probing beam distortion. The improvement of the microwave diagnostics interpretative models is the main object of the study presented in this thesis.The aim of this PhD work is to include these missing effects in an interpretative model for CTS using X-mode probing beam
Jaoul, Cédric. "Étude par thermogravimétrie d'un procédé de nitrocarburation des aciers assisté par une post-décharge micro-ondes dans les mélanges N2-CH4 et Ar-N2-H2-C3H8 : diagnostic optique et modélisation de l'interaction gaz-surface". Vandoeuvre-les-Nancy, INPL, 2004. http://www.theses.fr/2004INPL113N.
Pełny tekst źródłaN2-CH4 afterglow is first studied by optical emission spectroscopy. A method to measure densities of carbon and nitrogen atoms in the post-discharge is presented. The mass gains of pure iron sam pies during post-discharge nitrocarburising treatments are monitored by in situ thermogravimetry. The use of propane during sequenced treatments shows that the studied orocess allows the synthesis of various carbonitride configurations: monophased (E) or multi-phased compound layer. The modeling of volume kinetic processes in the gas phase suitably predict the order of magnitude of the densities for major species in the N2-CH4 post- discharge. Lastly, we propose original results obtained by coupling several models (chemical kinetics of the gas phase, surface kinetics and diffusion in the solid) in the case of post-discharge nitriding
Gavillet, Jérôme. "Dépôt chimique de zircone en phase vapeur par réaction entre ZrCl4 et une post-décharge micro-ondes Ar-O2-H2 en écoulement : diagnostic de la phase gazeuse, modélisation du réacteur et caractérisation des films". Vandoeuvre-les-Nancy, INPL, 1996. http://docnum.univ-lorraine.fr/public/INPL_T_1996_GAVILLET_J.pdf.
Pełny tekst źródłaSharabaty, Hassan. "Diagnostic de la somnolence d'un opérateur : analyse automatique de signaux physiologiques". Phd thesis, Université Paul Sabatier - Toulouse III, 2007. http://tel.archives-ouvertes.fr/tel-00197161.
Pełny tekst źródłaMaulois, Mélissa. "Etude expérimentale et numérique de la cinétique de plasmas d'air produits par rayonnement X impulsionnel". Thesis, Toulouse 3, 2016. http://www.theses.fr/2016TOU30121/document.
Pełny tekst źródłaThe irradiation of air by an X-ray, produces an air plasma which can affect the generation and the propagation of electromagnetic fields, disrupting the surrounding electronic systems. Quantifying these constraints requires beforehand a comprehensive study of the plasma generated by the energetic particles. A 0D chemical kinetics model was developed to characterize the time evolution of the air X-ray induced plasma for different air pressures. The model is defined by the coupling of the evolution equation of the densities of the main species plasma with the equation of conservation of the mean energy density of electrons. To develop and test the model, it was first applied to a theoretical case where the plasma is generated by an X-ray flash with a duration of 100 ns with a constant mean energy equal to 1 MeV. The irradiation of dry air by X-rays leads to the generation of two populations of electrons Compton "relativistic" and "non-relativistic". In fact, these Compton electrons initiate the electron avalanches leading to the formation of the studied plasma. The obtained results show that the plasma is primarily generated by ionization of the gas by the relativistic Compton electrons. Although initiated by hard X-rays, the plasma generated is weakly ionized with a maximum electron density of 1013 cm-3 at atmospheric pressure and a maximum electron mean energy of about 4 eV. The validation of the model is based on the electron density measurements. For various air pressures, the experiments performed consist of irradiating an air-filled waveguide, by an X-ray pulse during 90 ns. The aim of the experiment is to measure the absorption of an electromagnetic wave after its passage through the plasma contained in the guide. The absorption coefficient of the wave in the guide depends on the constant of propagation in free space, which is proportional to the plasma frequency and thus to the electron density. The experimental electron density is then determined using the formalism of absorption in a plasma filled waveguide. To compare the experimental and numerical results, the kinetic model was adapted to the experiments by considering more particularly the waveguide walls and the humidity of the air. In the case of air with 76% of relative humidity, between 30 mbar and atmospheric pressure, the relative gap between the measurements and the model for the maximum electron density is lower than 10% knowing that the maximum of the density varies from 3.5x1013 to 4x1011 cm-3. The deviation between the measured electron density and the simulated one, increases when the whole X-ray pulse duration is considered, with a mean relative deviation of about 30%. Knowing that the measurement of the electron density is determined with an uncertainty of ± 30%, the kinetic model results are satisfying and thus enable the model validation. The kinetic model has also allowed to determine the time evolution of the mean electron energy of the plasma
Vašina, Petr. "Plasma diagnostics focused on new magnetron sputtering devices for thin film deposition". Paris 11, 2005. http://www.theses.fr/2005PA112181.
Pełny tekst źródłaThe main aim of this thesis is to investigate fundamental aspects of generation and behaviour of two advanced magnetron sputtering discharges for IPVD (Ionised Physical Vapour Deposition) process : a microwave assisted DC (Direct Current) magnetron discharge and a high power pulsed magnetron discharge operating with a preionization. The microwave assisted reactor consists of a titanium magnetron cathode excited by a direct current and two microwave coaxial antennas located perpendicularly to the magnetron substrate holder axis. Spatially resolved plasma diagnostics are presented. The main diagnostic method was absorption spectroscopy which permited to obtain simultaneously the spatial evolution of titanium atom temperature and the spatial evolutions of titanium neutral atom and ion densities. Particular attention is given to the estimation and the role of gas temperature. In the high power pulsed PVD, sputtered particles are ionized in the magnetized region and after that, they can leave it and continue towards the substrate. These processes are time dependent and it is suitable in this case to perform time resolved measurements. Plasma dynamics, time evolution of plasma compositions and particularly the extremely fast transition to stable self- sputtering regime is discussed. Simultaneously with the creation processes of ions, their transport was studied too. A chapter of the thesis is devoted to a new method to obtain simultaneous N and O atom concentrations in N2 and N2-O2 post discharges by NO titration from NO b system UV radiation. This method could help to understand selected complex processes involved
Mézerette, David. "Diagnostics et modélisation du nettoyage de surface par une post-décharge micro-ondes argon-azote". Vandoeuvre-les-Nancy, INPL, 2002. http://www.theses.fr/2002INPLA54N.
Pełny tekst źródłaNoel, Cédric. "Plasmas micro-ondes d'argon à la pression atmosphérique : diagnostics et applications au nettoyage de surfaces". Thesis, Vandoeuvre-les-Nancy, INPL, 2009. http://www.theses.fr/2009INPL020N/document.
Pełny tekst źródłaThe present work deals with the study of argon microwave plasmas generated in resonant cavity at atmospheric pressure and their application to surface cleaning. First, a study of the aim of surface cleaning of industrial surfaces is presented, followed by a state of the art of existing solutions and their limitations, showing the interest of plasmas as an alternative, especially atmospheric pressure microwave resonant cavity plasmas. In the case of argon, these plasmas have the particularity to be inhomogeneous and constituted of one or many small diameter filaments, depending on experimental conditions. The study of the filamentation of these discharges is the subject of the second chapter. In the case of one filament, correlations have been evidenced between its size, its temperature and the dissipated power. A simple electromagnetic simulation allowed us to describe the influence of the main plasmas parameters on the filamentation process. The third chapter presents results from the characterisation of a single argon filament by the mean of diode laser absorption in continuous and pulsed plasma mode. The effect of oxygen addition is also studied. The last chapter deals with the study of the use of atmospheric pressure microwave post-discharges in argon-nitrogen or argon-oxygen mixtures for surface cleaning application. We studied the interaction of such post-discharges with model organic molecules (stearic acid and 1-octadecene). Surface analyses by the mean of extreme surface analysis techniques based on mass spectrometry (ToF-SIMS and FTMS) allow us to improve our understanding of cleaning mechanisms
Noël, Cédric Belmonte Thierry. "Plasmas micro-ondes d'argon à la pression atmosphérique diagnostics et applications au nettoyage de surfaces /". S. l. : S. n, 2009. http://www.scd.inpl-nancy.fr/theses/2009_NOEL_C.pdf.
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