Tesis sobre el tema "Projection à la flamme"
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Gonzalez, Hernandez Andrés Giovanni. "Etude du comportement à haute température de revêtements nanostructurés élaborés par projection thermique (combustion et plasma) à partir de poudres et de suspensions". Thesis, Limoges, 2014. http://www.theses.fr/2014LIMO0046/document.
Texto completoThe research topic of this thesis is devoted on the study of the behavior of nanostructured coatings based on zirconia, which extends from the characterization of raw materials through manufacturing, characterization of the properties of the coatings and then end up in the study of their behavior at high temperature, especially in strong environments to make them comparable. Three kinds of techniques were used for manufacturing the coatings: flame spraying (FS), atmospheric plasma spraying (APS) and suspensions plasma spraying (SPS).Three types of substrates were used and characterized for manufacturing the coatings: a low carbon steel (AISI/SAE12L15), stainless steel 304L and superalloy Inconel 718. A surface treatment of blasting with corundum was applied to all substrates in order to generate a noticeable roughness (> 5 µm), then apply a bond coat of Ni-Al-Mo for the technique FS and a bond coat of NiCrAlCo-Y2O3 for the technique APS and SPS. The coatings were characterized to know and correlate the morphology of the cross section and surface, elemental composition of the zones of interest, phases, thickness, porosity, microhardness, vibrational groups, corrosion resistance and wear resistance. Additionally, the most important was to characterize the high temperature performance of the coating by tests as thermal shock, isothermal oxidation and hot corrosion with salts. For knowing the behavior of the coatings after being subjected to these tests, a study of the morphology of the surface and cross-section, elemental composition and phases analysis in the regions of interest have also been carried out
Vargas, Fabio. "Elaboration de couches céramiques épaisses à structures micrométriques et nanométriques par projections thermiques pour des applications tribologiques". Limoges, 2010. https://aurore.unilim.fr/theses/nxfile/default/5ebc961d-ad83-473c-9dcb-1865814e9bfd/blobholder:0/2010LIMO4060.pdf.
Texto completoAlumina titania coatings with 13 wt. % and 45 wt. % of TiO2 (AT-13 and AT-45 respectively) were sprayed by atmospheric plasma spray and oxy-acetylene flame using micro structured powders or cords. Additionally, nanometer sized agglomerated particles (AT-13) were plasma sprayed. Particles from powders and cords were sprayed using oxyacetylene flames and plasma jets with different enthalpies in order to vary the physical and chemical properties of resulting coatings. The effect on mechanical properties and tribological behavior of the structural characteristics of coatings, as well as chemical composition and its phases was studied. The wear resistance was measured by dry elastic contact between a sintered alumina ball 6 mm in diameter and the coated discs, applying a load of 5 N on the alumina ball during 20,000 cycles. The ball was moved on the polished coating surface with a linear speed of 0. 1 m/s. Also drilling tests between a special steel drill bit 12. 5 mm in diameter and the surface of coating were carry out in order to determine the wear resistance to plastic contact. The wear tests results show that, AT-13 coatings are more resistant than AT-45 ones, due to the presence of a αand γalumina, which are high mechanical resistance phases. In the contrary, while AT-45 coatings consist of Al2TiO5 and Al6Ti2O13 phases that are brittle with lower hardnesses. Additionally it was shown that the wear resistance of the plasma sprayed coatings is higher than that those deposited by oxy-acetylene flame because of their more homogeneous structure and better interlamellar cohesion
Yang, Young-Myung. "Modélisation mathématique d'un système de projection thermique à la flamme de type H. V. O. F. : application à l'élaboration de revêtements protecteurs". Belfort-Montbéliard, 1996. http://www.theses.fr/1996BELFA001.
Texto completoA study of HVOF thermal spraying processes has been carried out in two parts : mathematical modeling and applications to coatings elaboration. The established models allox to estimate the combustion properties, the gas flow characteristics and the in-flight particle behaviors. The combustion process was modeled on the basis of equilibrium chemistry to determine thec chemical composition of combustion products, the adibatic flame temperature, the thermodynamic and transport properties and the detonation proerties. Internal flow in the gun nozzle was modeled using the Euler equations for an quasi-one-dimensional model and the full Navier-Stokes equations for a two-dimensional model; external flow wwas modeled using the boundary-layer equations. These flow models were studied with frozen and equilibrium approaches. The particle model was built using the Lagrangian formulation with a moving grid system which allows to treat melting and solidification problems in a particle. For the application part, a new HVOF process in which natural gas is used as fuel gas was studied. The simulation and experimental results showed that this new process improves the operation reliability of HVOF systems, the coating quality and the safety. A new X-HVOF torch of a chamber-stabilized combustion type was also studied with respect to the simulation and application aspects. The oxidation behavior of MCrA1Y coatings during the coating process was investigated in correlation to combustion characteristics; it was thus revealed that the coating oxidation depends slightly on the oxygen content of the combustion products btu strongly on the flame temperature. The overall results obtained in this study showed that it was possible to obtain a reasonable prediction of gas and particle characteristics using the proposed models
Arcondéguy, Aure. "Étude de la réalisation de dépôts de silico-alumineux (émaux) par projection thermique sur des substrats thermo dégradables". Limoges, 2008. http://aurore.unilim.fr/theses/nxfile/default/dbe0a6e1-b8e9-42d2-84b6-71a2356d2e88/blobholder:0/2008LIMO4036.pdf.
Texto completoA glazing thermal spraying process adapted to thermally sensitive substrates was developed here. An oxyacetylene flame torch was used. The optimization of glaze powders morphology (densification) and chemical composition was necessary to control coatings architectures. Effects of operating parameters were determined by a design of experiments and operating parameters were optimized. Colored coatings can have been manufactured by insert pigments addition. The coating formation mechanism was hence deduced: it differs from the one encountered for other ceramic materials. Then, glaze coatings were manufactured on larger surfaces (~1 m²) to determine the effects of thermal flux on the coating formation mechanism and to limit the substrate degradation. A substrate preheating was necessary to improve coating adhesion. At last, some coatings properties were determined. For example, coatings mechanical characteristics were not modified by freeze-thaw cycles
Kedia, Kushal Sharad. "Development of a multi-scale projection method with immersed boundaries for chemically reactive flows and its application to examine flame stabilization and blow-off mechanisms". Thesis, Massachusetts Institute of Technology, 2013. http://hdl.handle.net/1721.1/85234.
Texto completoThis electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Cataloged from student-submitted PDF version of thesis.
Includes bibliographical references (pages 193-201).
High-fidelity multi-scale simulation tools are critically important for examining energy conversion processes in which the coupling of complex chemical kinetics, molecular transport, continuum mixing and acoustics play important roles. The objectives of this thesis are: (i) to develop a state-of-the-art numerical approach to capture the wide spectra of spatio-temporal scales associated with reacting flows around immersed boundaries, and (ii) to use this tool to investigate the underlying mechanisms of flame stabilization and blow-off in canonical configurations. A second-order immersed boundary method for reacting flow simulations near heat conducting, grid conforming, solid object has been developed. The method is coupled with a block-structured adaptive mesh refinement (SAMR) framework and a semi-implicit operator-split projection algorithm. The immersed boundary approach captures the flame-wall interactions. The SAMR framework and the operator-split algorithm resolve several decades of length and time efficiently. A novel "buffer zone" methodology is introduced to impose the solid-fluid boundary conditions such that symmetric derivatives and interpolation stencils can be used throughout the interior of the domain, thereby maintaining the order of accuracy of the method. Near an immersed solid boundary, single-sided buffer zones are used to resolve the species discontinuities, and dual buffer zones are used to capture the temperature gradient discontinuities. This eliminates the need to utilize artificial flame anchoring boundary conditions used in existing state-of-the-art numerical methods. As such, using this approach, it is possible for the first time to analyze the complex and subtle processes near walls that govern flame stabilization. The approach can resolve the flow around multiple immersed solids using coordinate conforming representation, making it valuable for future research investigating a variety of multi-physics reacting flows while incorporating flame-wall interactions, such as catalytic and plasma interactions. Using the numerical method, limits on flame stabilization in two canonical configurations: bluff-body and perforated-plate, were investigated and the underlying physical mechanisms were elucidated. A significant departure from the conventional two-zone premixed flame-structure was observed in the anchoring region for both configurations. In the bluff-body wake, the location where the flame is initiated, preferential diffusion and conjugate heat exchange furnish conditions for ignition and enable streamwise flame continuation. In the perforated-plate, on the other hand, a combination of conjugate heat exchange and flame curvature is responsible for local anchoring. For both configurations, it was found that a flame was stable when (1) the local flame displacement speed was equal to the flow speed (static stability), and (2) the gradient of the flame displacement speed normal to its surface was higher than the gradient of the flow speed along the same direction (dynamic stability). As the blow-off conditions were approached, the difference between the former and the latter decreased until the dynamic stability condition (2) was violated. The blowoff of flames stabilized in a bluff-body wake start downstream, near the end of the combustion-products dominated recirculation zone, by flame pinching into an upstream and a downstream propagating sections. The blow-off of flames stabilized in flow perforated-plate wake start in the anchoring region, near the end of the preheated reactants-filled recirculation zone, with the entire flame front convecting downstream. These simulations elucidated the thus far unknown physics of the underlying flame stabilization and blow-off mechanisms, understanding which is crucial for designing flame-holders for combustors that support continuous burning. Such an investigation is not possible without the advanced numerical tool developed in this work. Based on the insight gained from the simulations, analytical models were developed to describe the dynamic response of flames to flow perturbations in an acoustically coupled environment. These models are instrumental in optimizing combustor designs and applying active control to guarantee dynamic stability if necessary.
by Kushal Sharad Kedia.
Ph. D.
Goble, Keryn Sheree. "Height of Flames Projecting from Compartment Openings". Thesis, University of Canterbury. Civil and Natural Resources Engineering, 2007. http://hdl.handle.net/10092/1580.
Texto completoRoche, Bruno. "Prédiction numérique des écoulements turbulents réactifs : Flamme turbulente oblique prémélangée et interaction flamme/tourbillons". Ecully, Ecole centrale de Lyon, 1995. http://www.theses.fr/1995ECDL0028.
Texto completoThe analysis and modelisation of the turbulent combustion is an important step for the study and simulation of industrial devices such as reciprocating engines of burners. The problem complexity is linked to the interaction between the thermo-chemical phenomena of the flame front and the scales of the turbulence spectrum. This problem can be simplified if we discretize the turbulence spectrum by treating each turbulent scale as a vortex. Our work in this domain follows two main axis : the prediction of a turbulent flame front and the simulation between an oblique flame front and a von Karman vortex street. The first part starts with the simulation of a laminar reference case. Then, the turbulent premixed oblique flame front is studied. The problem of the Lewis number influence on the flame structure is treated using two cases of mixing, hydrogen-air and methane-air. In a second part, we study the interaction between laminar premixed hydrogen-air oblique flame front and a von Karman vortex street. The prediction of this phenomenon show the vortex influence on the wrinkling and the extinction of the flame front. For each step, the comparison between numerical predictions and experimental data is realized. It allows us to analyze the performance of the modelisations and gives complementary data on the studied phenomena
Vallance, Scott y scottvallance@internode on net. "Trilinear Projection". Flinders University. School of Informatics & Engineering, 2005. http://catalogue.flinders.edu.au./local/adt/public/adt-SFU20050714.113416.
Texto completoPhillips, Lee Stephen. "Projection synthesis". Thesis, University of Strathclyde, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.367051.
Texto completoWyzgolik, Aurélie. "Stabilisation d'une flamme non-prémélangée dans un écoulement de jets coaxiaux : effets d'un champ acoustique". Rouen, 2008. http://www.theses.fr/2008ROUES049.
Texto completoThis work focuses on unsteady combustion phenomena whose control is a key point in the efficient operation of engines and furnaces. Stability limits and stabilization mechanisms are analyzed for flames of non-premixed coaxial jets (methane/air), anchored or lifted above the burner. The transition from attachment to liftoff is characterized by an original thermal criterion for both identified lifting processes during which the flame base passes from a mainly propagative extremity to a mainly diffusive one. The properties of the flame, lifted either in its hysteresis zone or in the liftoff zone, and those of vortical structures of the jet detected by an automatic identification technique, are quantified by imagery and velocimetry diagnostics. The organization of the methane/air mixing layer governs the flame response from a laminarized aspect with a lobed base to a turbulent one when the air velocity (Uo) is increased. The flame is stabilized by the dynamics of the counter-rotating vortices issued from secondary instabilities, influenced when they are formed by the Kelvin-Helmholtz vortices. The flame adapts to conditions imposed by Uo whose ratio with the laminar flame speed (Sl) pilots its laminarized or turbulent behavior. Inside the chambers, combustion instabilities are increased by acoustic waves creating various modes in interaction with the own modes of the stream. So, our experiment is adjusted to study the flame submitted to a sinewave forcing of the methane. Its responses are discriminated according to the forcing frequencies and amplitudes; increasing Uo shifts the limits of the identified zones, even some of them can disappear. For all Uo, forced : - near its natural frequency (1200 Hz), the jet is more ordered ; - near its first harmonic frequency (2600 Hz), the jet shows several non linearly interacting modes. For both high frequencies, forcing contributes to a better mixing, and so to a reduction of the liftoff height (Hl) for small Uo. But, this effect is weakened with Uo increase, or even reversed at 2600 Hz for high Uo. For medium frequencies (200 Hz), the behavior tends to a turbulent flame whose liftoff height pivots around a data obtained for Uo ~ Sl (Hl grows (reduces) for small (high) Uo). For any condition (Uo, frequency, amplitude), the mode interaction mechanisms govern the flame response through the vortical structures
Thévenin, Dominique. "Dynamique de l'allumage de flammes de diffusion dans des écolulements cisaillés : étude théorique et dynamique". Châtenay-Malabry, Ecole centrale de Paris, 1992. http://www.theses.fr/1992ECAP0261.
Texto completoDamberg, Gerwin. "Computational projection display : towards efficient high brightness projection in cinema". Thesis, University of British Columbia, 2017. http://hdl.handle.net/2429/62421.
Texto completoScience, Faculty of
Computer Science, Department of
Graduate
Luz, Liliana Alexandra Laracho da Silva. "NOCICEPTIVE PROCESSING ON PROJECTION AND NON-PROJECTION LAMINA I NEURONS". Doctoral thesis, Faculdade de Medicina da Universidade do Porto, 2011. http://hdl.handle.net/10216/57128.
Texto completoLuz, Liliana Alexandra Laracho da Silva. "NOCICEPTIVE PROCESSING ON PROJECTION AND NON-PROJECTION LAMINA I NEURONS". Tese, Faculdade de Medicina da Universidade do Porto, 2011. http://hdl.handle.net/10216/57128.
Texto completoMaurey, Christophe. "Etude expérimentale de la stabilisation et du soufflage des flammes de diffusion turbulentes suspendues". Rouen, 2001. http://www.theses.fr/2001ROUES001.
Texto completoMusgraves, J. David. "Maskless Projection Lithography". Scholarship @ Claremont, 2003. http://scholarship.claremont.edu/pomona_theses/17.
Texto completoDelhommé, Christian. "Propriétés de projection". Lyon 1, 1995. http://www.theses.fr/1995LYO10159.
Texto completoPang, Hyo Sun. "Etude de l'application du modèle Cora au cas d'un brûleur industriel à contre rotation". Rouen, 1991. http://www.theses.fr/1991ROUES026.
Texto completoDenet, Bruno. "Simulations numériques d'instabilités de front de flamme". Aix-Marseille 1, 1988. http://www.theses.fr/1988AIX11155.
Texto completoZunino, Antoni. "Etude numérique des conditions d'allumage d'un mélange d'hydrocarbure et d'air sur la base d'une réaction chimique globale". Poitiers, 1996. http://www.theses.fr/1996POIT2262.
Texto completoTirtoatmodjo, Rahardjo. "Caractérisation par pyrométrie polychromatographique des flammes de diffusion turbulentes monophasiques et diphasiques". Ecully, Ecole centrale de Lyon, 1993. http://www.theses.fr/1993ECDL0050.
Texto completoBenkhaldoun, Fayssal. "Etude numérique de modèles mathématiques décrivant la propagation de flammes dans un milieu gazeux bidimensionnel". [Le Chesnay] : Institut national de recherche en informatique et en automatique, 1988. http://catalogue.bnf.fr/ark:/12148/cb34935250d.
Texto completoCriner, Karine. "Stabilisation de flammes de diffusion turbulentes assistée par plasma hors-équilibre et par champ électrique". Rouen, 2008. http://www.theses.fr/2008ROUES026.
Texto completoThis study aims at investigating the potential of a non-equilibrium plasma to stabilize jet and swirled flames. Jet-flames are efficiently stabilized by pulsed high-voltage dielectric barrier discharges (55kV-200Hz-0. 6W). But the production of radicals by the discharge is not sufficient to modify the combustion. Stabilization is then improved when applying a continuous high-voltage. Stability of coflow and swirled flames is also improved with this new configuration. Coupled measures of PIV and LIF (OH and acetone) shows that below the flame, velocity and mixture fraction fields are not modified, but with the electric field, the flame sustains a higher mixture fraction gradient. When swirl intensity increases, field effects become negligible
Tabet, Fouzi. "Contribution à la modélisation et à la simulation numériques des flammes turbulentes non-prémélangées". Orléans, 2007. http://www.theses.fr/2007ORLE2071.
Texto completoManurangsi, Pasin. "On approximating projection games". Thesis, Massachusetts Institute of Technology, 2015. http://hdl.handle.net/1721.1/100635.
Texto completoThis electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Cataloged from student-submitted PDF version of thesis.
Includes bibliographical references (pages 99-105).
The projection games problem (also known as LABEL COVER) is a problem of great significance in the field of hardness of approximation since almost all NP-hardness of approximation results known today are derived from the NP-hardness of approximation of projection games. Hence, it is important to determine the exact approximation ratio at which projection games become NP-hard to approximate. The goal of this thesis is to make progress towards this problem. First and foremost, we present a polynomial-time approximation algorithm for satisfiable projection games, which achieves an approximation ratio that is better than that of the previously best known algorithm. On the hardness of approximation side, while we do not have any improved NP-hardness result of approximating LABEL COVER, we show a polynomial integrality gap for polynomially many rounds of the Lasserre SDP relaxation for projection games. This result indicates that LABEL COVER might indeed be hard to approximate to within some polynomial factor. In addition, we explore special cases of projection games where the underlying graphs belong to certain families of graphs. For planar graphs, we present both a subexponential-time exact algorithm and a polynomial-time approximation scheme (PTAS) for projection games. We also prove that these algorithms have tight running times. For dense graphs, we present a subexponential-time approximation algorithm for LABEL COVER. Moreover, if the graph is a sufficiently dense random graph, we show that projection games are easy to approximate to within any polynomial ratio.
by Pasin Manurangsi.
M. Eng.
Bergez, Gérard. "Pensée divergente, projection, pédagogie". Caen, 1985. http://www.theses.fr/1985CAEN1020.
Texto completoHansen, Bret. "Graphic Design as Projection". VCU Scholars Compass, 2010. http://scholarscompass.vcu.edu/etd/2117.
Texto completoFranco, Correa Iván David. "Étude tribologique à hautes températures de matériaux céramiques structurés à différentes échelles". Thesis, Limoges, 2019. http://www.theses.fr/2019LIMO0106.
Texto completoIn order to evaluate and to understand the wear performance and mechanisms at high temperatures that take place when different chemical compositions (Al2O3, ZrO2, mullite), scales (finely structured, microstructured and submillimetric) and configurations (single layer, bilayer and volume) interact, atmospheric plasma sprayed coatings manufactured on a silicoaluminous ceramic substrate were used. The Al2O3, ZrO2-Al2O3 and ZrO2-Y2O3 coatings correspond to the monolayer configuration, as well as the finely and microstructured scales, while the Mullite/Al2O3, Mullite/ ZrO2-Al2O3 and of Mullite/ ZrO2-Y2O3 correspond to the bilayer configuration, where the outer mullite layer is microstructured and the sub-layers can correspond to finely and microstructured scales. In the same way, the Al2O3 and AZS commercial refractories correspond to the volume configuration and the submillimeter scale, taking into account that these have also been used as references because of the high resistance to wear that they show in glass and cement industries. Subsequently, these ceramic materials were subjected to sliding contact wear conditions (5 N, 20000 rpm and 0,10 ms-1) with a ball on disk tribometer at temperatures of: 25, 500, 750 and 1000 °C. The results indicate that the wear of the Al2O3, ZrO2-Al2O3 and ZrO2-Y2O3 coatings at 25 and 1000 ° C was by ductile deformation, showing wear rates of the order of 10-4-10- 6 and 10-4-10-5 mm3.N-1.m-1 respectively, while at 500 and 750 °C was by brittle deformation with wear rates of the order of 10-3-10-4 mm3.N-1.m-1 for both temperatures, finding a slightly higher wear resistance in finely structured coatings due primarily to toughness. Regarding the two electro-melted volume refractories at submillimetric scale, they showed wear by ductile deformation only at 1000 °C, showing wear rates of the order of 10-4 mm3.N-1.m-1. On the other hand, the mullite bilayer systems showed wear by brittle deformation at all evaluated temperatures, with wear rates of the order of 10-3-10-4 mm3.N-1.m-1, without showing any improvement at all because of the presence of the sub-layers. Finally, aiming to seek more economical options, as well as to give other applications to the materials studied, it has also been determined the influence on wear at high temperature of Al2O3 coatings, finely and microstructured, manufactured by the chep technique of oxy-flame spraying, as well as the same Al2O3 coatings manufactured by plasma spraying on a metallic substrate of Inconel 718, which is used by the space and aerospace industries, obtaining for both cases comparable and similar results to all those obtained previously
Con el fin de evaluar el desempeño y comprender los mecanismos de desgaste de materiales cerámicos que se producen a alta temperatura cuando diferentes composiciones químicas (Al2O3, base ZrO2, mullita), diferentes escalas de estructura (finamente estructurado, microestructurado y submilimétrico) y diferentes configuraciones (mono-capa, bi-capa y en volumen) interactúan, fueron realizados recubrimientos cerámicos por proyección térmica de plasma sobre un sustrato cerámico silico-aluminoso. Los recubrimientos de Al2O3, ZrO2-Al2O3 y ZrO2-Y2O3 corresponden con la configuración mono-capa y con las escalas finamente estructurada y microestructurada. Mientras que los recubrimientos de mullita/Al2O3, mullita/ ZrO2-Al2O3 y mullita/ ZrO2-Y2O3 corresponden con la configuración bi-capa, donde la capa superior de los recubrimientos es de mullita microstructurada y las subcapas pueden ser finamente estructuradas y microestructuradas. Dichos recubrimientos fueron comparados con refractarios electrofundidos de Al2O3 y AZS correspondientes con la configuración en volumen y con la escala submilimétrica, los cuales también fueron utilizados como referencias debido a sus altas resistencias al desgaste a altas temperaturas en industrias tales como: la del vidrio y el cemento. Todos los materiales cerámicos fueron sometidos a condiciones de desgaste por contacto deslizante (5 N, 20000 vueltas y 0,10 m.s-1) con un tribómetro de tipo bola-disco a temperaturas de 25, 500, 750 y 1000 °C. Los resultados indican que el desgaste en los recubrimientos de Al2O3 y base ZrO2 a 25 y 1000 °C fue por deformación dúctil, con tasas de desgaste de 10-4-10-6 et 10-4-10-5 mm3.N-1.m-1 respectivamente, mientras que a 500 y 750 °C el desgaste fue por deformación frágil con tasas de desgaste del orden de 10-3-10-4 mm3.N- 1.m-1 para ambas temperaturas y ambos materiales. La resistencia al desgaste en los recubrimientos finamente estructurados fue ligeramente superior debido principalmente a la mayor tenacidad tenacidad a la fractura. Para los dos refractarios electrofundidos en volumen a escala submilimétrica, el desgaste por deformación dúctil fue detectado solo a 1000 °C, con tasas de desgaste del orden de 10-4 mm3.N-1.m-1. Para los sistemas bi-capa de mullita, el desgaste por deformación frágil se observó a todas las temperaturas evaluadas, con tasas de desgaste del orden de 10-3-10-4 mm3.N-1.m-1, sin mostrar ninguna mejora debido a la presencia de una subcapa cerámica. Finalmente, en aras de buscar tanto soluciones más económicas como otras aplicaciones, el comportamiento tribológico a alta temperatura se estudió también en recubrimientos de Al2O3 finamente estructurados y microestructurados, realizados mediante proyección térmica de llama oxiacetilénica, más económica que la proyección de plasma, así como sobre los mismos recubrimientos de Al2O3 realizados mediante proyección de plasma sobre un sustrato metálico de Inconel 718, utilizado comúnmente en las industrias espacial y aeronáutica. En ambos casos, los resultados fueron similares a los obtenidos por plasma o por sustrato refractario
Erard, Valérie. "Etude spatiale et temporelle des champs thermiques et dynamiques de la combustion de prémélange turbulente instationnaire". Rouen, 1996. http://www.theses.fr/1996ROUES073.
Texto completoLaViolette, Marc. "Mesure non-intrusive de la température de flamme". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape8/PQDD_0001/NQ39368.pdf.
Texto completoPelce-Savornin, Chantal. "Etude expérimentale de fronts de flamme courbes stationnaires". Aix-Marseille 1, 1987. http://www.theses.fr/1987AIX11115.
Texto completoBourehla, Adnen. "Instabilites forcees d'une flamme vibrante conique de premelange". Paris 6, 1994. http://www.theses.fr/1994PA066329.
Texto completoBELLAICHE, PASCALE. "Thermometrie drasc dans une flamme de diffusion turbulente". Paris 6, 1991. http://www.theses.fr/1991PA066023.
Texto completoPernot, Cyril. "Développement d'un détecteur de flamme à base d'AlGaN". Montpellier 2, 2000. http://www.theses.fr/2000MON20043.
Texto completoPelce-Savornin, Chantal. "Etude expérimentale de fronts de flamme courbes stationnaires". Grenoble 2 : ANRT, 1987. http://catalogue.bnf.fr/ark:/12148/cb376087785.
Texto completoRamgobin, Aditya. "Synthèse et conception de retardateurs de flamme intelligents". Thesis, Lille 1, 2019. http://www.theses.fr/2019LIL1R045/document.
Texto completoPolymeric materials have been increasingly used as replacement for other types of materials such as ceramics or metals. However, most polymers have a serious drawback: they need to be fire retarded. Nevertheless, thanks to advanced research in the field, high performance materials that resist high temperatures and fire scenarios have been developed. While these materials have extremely enviable properties, they are also very expensive. The aim of this PhD is to understand the fire behavior of high-performance polymers and design fire retardants that would mimic these high-performance materials under extreme heat or fire. To do so, the thermal and fire behavior of three high performance materials were studied: polyetheretherketone (PEEK), polyimide (PI), and polybenzoxazole (PBO). Their thermal decomposition pathways were evaluated thanks to high temperature analytical techniques like pyrolysis-GC/MS and TGA-FTIR. Model based kinetics of the thermal decomposition of these polymeric materials were also elucidated by using dynamic TGA under three different atmospheres (nitrogen, 2% oxygen, and air). These provided insight regarding the thermal behavior high performance polymers, which were used to conceptualize novel potential fire retardants. Therefore, a series of fire retardants that have demonstrated similar behaviors as high performance polymers in fire scenarios were synthesized. These fire retardants include a Schiff base: salen and its derivatives, as well as some of their metal complexes. The thermal behavior and fire performances of these fire retardants were evaluated in two polymeric materials using a relatively low loading (< 10 wt%): thermoplastic polyurethane, and polyamide 6. While some of the fire retardants had little effect, in terms of fire retardancy, some candidates showed a significant improvement in terms of peak of heat release rate. This reverse approach towards designing fire retardants has shown some promise and can be used as a complementary method for the design of high-performance materials at lower cost
Ramgobin, Aditya. "Synthèse et conception de retardateurs de flamme intelligents". Electronic Thesis or Diss., Université de Lille (2018-2021), 2019. http://www.theses.fr/2019LILUR045.
Texto completoPolymeric materials have been increasingly used as replacement for other types of materials such as ceramics or metals. However, most polymers have a serious drawback: they need to be fire retarded. Nevertheless, thanks to advanced research in the field, high performance materials that resist high temperatures and fire scenarios have been developed. While these materials have extremely enviable properties, they are also very expensive. The aim of this PhD is to understand the fire behavior of high-performance polymers and design fire retardants that would mimic these high-performance materials under extreme heat or fire. To do so, the thermal and fire behavior of three high performance materials were studied: polyetheretherketone (PEEK), polyimide (PI), and polybenzoxazole (PBO). Their thermal decomposition pathways were evaluated thanks to high temperature analytical techniques like pyrolysis-GC/MS and TGA-FTIR. Model based kinetics of the thermal decomposition of these polymeric materials were also elucidated by using dynamic TGA under three different atmospheres (nitrogen, 2% oxygen, and air). These provided insight regarding the thermal behavior high performance polymers, which were used to conceptualize novel potential fire retardants. Therefore, a series of fire retardants that have demonstrated similar behaviors as high performance polymers in fire scenarios were synthesized. These fire retardants include a Schiff base: salen and its derivatives, as well as some of their metal complexes. The thermal behavior and fire performances of these fire retardants were evaluated in two polymeric materials using a relatively low loading (< 10 wt%): thermoplastic polyurethane, and polyamide 6. While some of the fire retardants had little effect, in terms of fire retardancy, some candidates showed a significant improvement in terms of peak of heat release rate. This reverse approach towards designing fire retardants has shown some promise and can be used as a complementary method for the design of high-performance materials at lower cost
Desgroux, Pascale. "Mesure de concentration d'espèces dans une flamme par fluorescence saturée induite par laser : une nouvelle approche". Rouen, 1988. http://www.theses.fr/1988ROUES003.
Texto completoOulanti, Hanae. "Formation des espèces carbonés dans les flammes : carbynoïdes, microdiamants et nanotubes". Mulhouse, 2005. http://www.theses.fr/2005MULH0800.
Texto completoThis work presents the formation of the carbonaceous species in the flames such as carbynoids, diamonds and nanotubes. The first part shows the possibility of synthesize carbynoids structures. Increase in the ratio O2/C2H2 led to a reduction in the content of the carbon atoms sp but increases the length of the chains. The second part is devoted to the synthesis of diamond films of various orientations according to parameters of deposition. The use of an untreated substrate enabled us to observe a diffusion phenomenon of Cobalt towards the upper surface of the diamond film. Large diamond monocrystals were synthesized by our method. In the third part, we study the production of the nanotubes by the flame method: 1) on a metal substrate where the nanotubes can be synthesized in a disordered way or be directed vertically towards surface of the substrate; 2) by injecting the catalyst in the flame
Bavoil, Eric. "Etude expérimentale de l'influence de la diminution de la température initiale (jusqu'à 100K) sur les déflagrations des mélanges H2-air". Poitiers, 1997. http://www.theses.fr/1997POIT2286.
Texto completoTripathi, Amita. "Structure des flammes cryotechniques à haute pression". Châtenay-Malabry, Ecole centrale de Paris, 2001. http://www.theses.fr/2001ECAP0702.
Texto completoMichou, Yanick. "Etude expérimentale de flammes diphasiques turbulentes, partiellement prémélangées et prévaporisées d'un mélange pauvre heptane-air". Orléans, 2000. http://www.theses.fr/2000ORLE2050.
Texto completoBaum, Markus. "Etude de l'allumage et de la structure des flammes turbulentes". Châtenay-Malabry, Ecole centrale de Paris, 1994. http://www.theses.fr/1994ECAP0333.
Texto completoBelaradh, Nabil. "Modélisation et simulation numérique d'une flamme turbulente non-prémélangée : effet de la pression et de la composition du mélange". Orléans, 2004. http://www.theses.fr/2004ORLE2029.
Texto completoDaguse, Thierry. "Effets du rayonnement thermique sur la structure de flammes laminaires de diffusion ou de prémélange en phase gazeuse". Châtenay-Malabry, Ecole centrale de Paris, 1996. http://www.theses.fr/1996ECAP0489.
Texto completoLemaire, Alix. "Etude de l'interaction flamme-tourbillon en milieu gazeux et diphasique : caractérisation de l'extinction sous influence d'un écoulement tourbillonnaire". Châtenay-Malabry, Ecole centrale de Paris, 2003. http://www.theses.fr/2003ECAP0941.
Texto completoDuclos, Jean-Marc. "Analyse du modèle de flamme cohérente fondée sur l'étude expérimentale d'une flamme turbulente prémélangée stationnaire : application aux moteurs automobiles à allumage commandé". Châtenay-Malabry, Ecole centrale de Paris, 1997. http://www.theses.fr/1997ECAP0556.
Texto completoWernhard, Christoph. "Automated deduction for projection elimination /". Heidelberg : AKA, 2009. http://opac.nebis.ch/cgi-bin/showAbstract.pl?u20=9783898383240.
Texto completoLevy, Urquidi Juan Pablo. "Groupes multipartenaires par projection d'interface /". [S.l.] : [s.n.], 1994. http://library.epfl.ch/theses/?nr=1294.
Texto completoGarcía, Odón Amaia. "Presupposition projection and entailment relations". Doctoral thesis, Universitat Pompeu Fabra, 2012. http://hdl.handle.net/10803/94496.
Texto completoEn esta tesis, trato el problema de la proyección de presuposiciones. Me centro mayoritariamente en oraciones compuestas de dos cláusulas y en oraciones condicionales cuya segunda cláusula contiene una presuposición. El argumento central es que la presuposición contenida en la segunda cláusula proyecta por defecto, con la excepción de casos en los que la presuposición entraña la primera cláusula (o, en las oraciones disyuntivas, la negación de la primera cláusula). En estos últimos casos, la presuposición no debería proyectar, puesto que es lógicamente más fuerte que la primera cláusula (o su negación). Por tanto, en las oraciones conjuntivas, si la presuposición proyectase, la aseveración de la primera cláusula por parte del hablante no sería informativa. En cuanto a las oraciones condicionales y disyuntivas, si la presuposición projectase, el hablante mostraría inconsistencia en sus creencias al mostrar incertidumbre acerca del valor de verdad de la primera cláusula (o su negación). Sostengo que, en oraciones condicionales, esta incertidumbre es implicada conversacionalmente mientras que, en las oraciones disyuntivas, resulta de la compatibilidad contextual de la primera cláusula. Mantengo que, en casos en los que la proyección es bloqueada, la presuposición es condicionalizada a la primera cláusula (o su negación). Demuestro que la condicionalización es motivada de manera directa por las restricciones de tipo pragmático descritas arriba y que, contrariamente a la idea defendida por la así llamada ‘teoría de la satisfacción’, la condicionalización de la presuposición es un fenómeno independiente de la satisfacción local de la misma.