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Academic literature on the topic 'Bombardement ionique – Modèles mathématiques'
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Dissertations / Theses on the topic "Bombardement ionique – Modèles mathématiques"
Vireton, Eric. "Contribution à la modélisation de la pulvérisation par faisceaux d'ions." Lyon 1, 1993. http://www.theses.fr/1993LYO10132.
Full textSamson, Éric. "Modélisation numérique du transport ionique dans les matériaux cimentaires non saturés." Doctoral thesis, Université Laval, 2005. http://hdl.handle.net/20.500.11794/18188.
Full textDuval, Victor. "Modélisation mathématique et numérique du fonctionnement d'un four de stockage de tritium." Paris 13, 1994. http://www.theses.fr/1994PA132005.
Full textFaucheux, Jean-François. "Influence du substrat semi-isolant sur les caractéristiques électriques des transistors à effet de champ Ga As réalisés par implantation ionique." Toulouse, ENSAE, 1985. http://www.theses.fr/1985ESAE0013.
Full textElmachtani-Idrissi, Jamila. "Etude théorique de la conductivité infrarouge du polyacétylène. Modélisation des systèmes neutres, systèmes dopés et de l'effet photoinduit." Montpellier 2, 1993. http://www.theses.fr/1993MON20113.
Full textVon, Bandel Sylvie. "Traitement thermique rapide et localisé de trempe et de cémentation des aciers par bombardement électronique : étude structurale et analytique." Compiègne, 1992. http://www.theses.fr/1992COMPD558.
Full textLatocha, Vladimir. "Deux problèmes en transport des particules chargées intervenant dans la modélisation d'un propulseur ionique." Toulouse, INSA, 2001. https://tel.archives-ouvertes.fr/tel-00002194.
Full textThe modelling of the ionic thruster belonging to the SPT class raises many problems of plasma physics. We studied two of them, namely the electron transport and the computation of the electric potential. The electron transport is subject to the influence of the fields (magnetic and electric) set in the channel of the thruster on the one hand, and to the collisions of electrons with heavy species and at the walls on the oher hand. We participated to the development of a SHE model, wich is derived by performing an asymptotic analysis of the Boltzmann equation with a condition that models the reflection at the walls. This model allow to approximate the Electron Energy Distribution Function by solving a diffusion equation in the {position, energy} space, whose scales are macroscopic. More precisely, we extended an existing approach to the case where scattering against atoms are taken into account, as well as inelastic collisions at the walls. Then we compared the implementation of this model tot the results of a Monte Carlo simulation. We obtain similar results at a very reduced computational cost. This work lead to three publications, which are incorporated to the thesis. In a second stage, we studied the computation of the electric field in two dimensions. Due to the presence of a magnetic field, this problem gives rise to an anisotropic elliptic problem. Furthermore, the conductivities along the magnetic field and across the magnetic field lines can differ by several orders of magnitude. We implemented a finite volume scheme and we showed the numerical difficulties raised by such anisotropies. Hence, we improved this method by relating the solution of a highly anisotropic problem to a sequence of isotropic problems. This method proved to behabe well and we should be able to treat realistic cases shortly
Valsaque, Fabrice. "Contribution à l'étude cinétique de l'interaction entre un plasma et une paroi : applications à la mesure de la température des ions par sondes ou par fluorescence induite par laser." Nancy 1, 2002. http://www.theses.fr/2002NAN10254.
Full textThe plasma-wall interaction is studied by means of a kinetic model based on the Vlasov-Poisson equations. This model is particularly relevant to low pressure plasmas, such as those used in fusion or surface etching. With the help of analytical and numerical computations, we model the perturbations induced by a solid surface on a plasma in order to improve the ion temperature measurements. Firstly, we show how to significantly correct the measurements from probes by taking into account their own interaction with the plasma. Secondly, we point out the overestimation of the measurements from laser induced fluorescence when the spatial resolution is too low (which is usually the case in the vicinity of a surface). So as to remedy this problem without changing the apparatus, we give a method to achieve a deconvolution of the spectroscopic measurements
Rochon, Jonathan. "Étude de la focalisation d’un faisceau ionique à la pression atmosphérique par des lentilles électrostatiques annulaires minces, dans une décharge couronne en configuration pointe-plan." Thesis, Université Laval, 2013. http://www.theses.ulaval.ca/2013/30312/30312.pdf.
Full textGagnon, Frédérick. "Modélisation par éléments finis du transport électrochimique des espèces ioniques dans une cuve Hall-Héroult." Thesis, Université Laval, 2012. http://www.theses.ulaval.ca/2012/28758/28758.pdf.
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