Tesis sobre el tema "Pcr isotherme"
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Pommies, Lilas. "Intégration de la préparation des échantillons dans une analyse par spectrométrie de masse et PCR isotherme". Electronic Thesis or Diss., université Paris-Saclay, 2024. http://www.theses.fr/2024UPASQ001.
Texto completoBioanalysis is the identification and the quantification of biological molecules or active biological agent in a sample. It is divided into several stages: sample collection and sending to the laboratory; sample preparation to make it compatible with the analysis method; analysis and, finally, measurement of the events occurring during the analysis.During this thesis, two analysis were studied: mass spectrometry, more specifically MALDI-TOF and an isothermal PCR called Loop-mediated isothermal amplification (LAMP).The main aim was to make these methods compatible with field use. To achieve this, the SPID, a device patented by CEA, was adapted to both technologies. This device enables a bacterial suspension to be filtered, concentrated, extracted and detected by lateral flow immunoassay. The SPID is a tool that eliminate the need for centrifugation or washing, methods traditionally used to prepare sample for MALDI and LAMP.To analyze ribosomal proteins by MALDI-TOF, an extraction buffer compatible with this technic had to be developed. Indeed, to facilitate bacterial lysis, the use of detergents is often recommended but detergents can prevent the identification of bacteria by mass spectrometry. The results were compared with a reference protocol proposed by Bruker. Using SPID, three bacterial species were identified at a concentration of 107 CFU/mL in a simple medium and in urine. In contrast, the reference protocol identified the same species at a concentration of 106 CFU/mL.To make heating step compatible with filed use, an autonomous heating station was designed during the thesis. This station heats the SPID tank for 40 minutes at 65°C. It could be battery-powered.The amplification products, called amplicons, are detected by lateral flow immunoassay. Amplicons are end-labeled using two pirmers. One primer is labeled with digoxygenin, the other with biotin. The amplicon is captured by an anti-digoxigenin antibody, immobilized on a nitrocellulose membrane; and revealed using streptavidin coupled to gold nanoparticles.With the optimizations made during the thesis, the complete LAMP field protocol takes less than an hour : from de sample preparation to the detection
Yu, Hao. "Matériaux hydrures pour le stockage irréversible ou réversible de l’hydrogène". Thesis, Lyon 1, 2012. http://www.theses.fr/2012LYO10247.
Texto completoThe use of fossil fuels (non-renewable) is the main raison of increasing the green house in the atmosphere. Among the considered alternatives, hydrogen is seen as the most attractive energy carrier. The storage of the hydrogen in the solid phase in the form of hydrides is one of the clean future solutions for storage and transport of energy. Among potential materials, sodium borohydride (NaBH4) and magnesium hydride (MgH2) were selected regarding their high hydrogen gravimetric capacity. The hydrolysis reaction of NaBH4 was studied in a liquid phase calorimetry coupled to a gas-meter, in order to monitor simultaneously the kinetics of the hydrogen production and the evolution of the reaction heat. We prepared cobalt supported catalysts using various supports (hydrotalcites, KF/Al2O3, heteropolyanions) with different acid-base properties. The supports and the catalysts were characterized by XRD, SEM+EDX, ICP and BET. Co/heteropolyanions showed a very high kinetics for the production of hydrogen accompanied by a total conversion in the hydrolysis reaction. The absorption and desorption of hydrogen were studied using magnesium hydride. In order to improve the sorption kinetics of MgH2, we have prepared the MgH2-MT (MT= transition metal Co, Ni, Fe, Cr, Mn), MgH2-MTmixture (MT= transition metal Co, Ni, Fe), MgH2-MTnano (MT = transition metal Conano, Ninano, Fenano, Cunano, Znnano) and MgH2-nLiBH4-MTnano (MT = transition metal Conano, Ninano, Fenano) mixtures by high energy ball milling. Their physicochemical properties were studied by XRD and SEM+EDX. The temperature of hydrogen desorption and the amount of hydrogen generated were investigated by TPD. The kinetics of hydrogen absorption and the reversibility of hydrogen storage were investigated with PCT isotherm for the system of MgH2-MTnano. The sample MgH2-10-Ninano presents the best property for reversible hydrogen storage; MgH2- 10-Conano and MgH2-10-Fenano are also good potential candidates
Coulibaly, Sandotin Lassina. "Abattement des phosphates des eaux usées par adsorption sur des géomatériaux constitués de Latérite, grès et schistes ardoisiers". Thesis, Université de Lorraine, 2014. http://www.theses.fr/2014LORR0065/document.
Texto completoWastewaters are often loaded in phosphate from human activities. The discharge of such wastewater without adequate treatment leads to rapid eutrophication of water bodies. The main of the present thesis was to characterize and investigate the removal efficiency of phosphate from water by natural geological material available in large amount in Ivory Coast. Ultimately, it has ambition to valorize geological material without mining interest for environmental purposes. For this research, the laterite, sandstone and shale were selected and prepared by mechanical crushing to obtain fine fractions below 80 µm. Detailed study to characterize these three rocks powder was performed, thus several mineralogical and physico-chemical properties were determinated by means of : X-ray diffraction (XRD), scanning electron microscopy (SEM), diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS), N2-adsorption/desorption techniques (BET), energy dispersive x-ray spectroscopy (EDX), particle size distribution, cation exchange capacity and chemical analyses by atomic emission spectrometry (ICP-AES) and mass spectrometry (ICP-MS). Data shows high percentages of iron, aluminum and calcium oxides and oxyhydroxides for these three materials. This composition confer to the fine fraction the specific surface of 34; 4.7 et 16.5 m2/g for laterite, sandstone and shale respectively. In addition, the mineral structures of these materials reveal the presence of meso-and microporosity. These materials were then evaluated in the batch treatment of synthetic liquid effluents containing pure KH2PO4. The optimal dosage and equilibrium times were detected. After, isotherms were built at 20, 30 and 40°C. It was shown that phosphate affinity for the three absorbents is more important for laterite, sandstone and shale. The absorption process is strongly depends on pH. Phosphate retention rate on sandstone seem not to depend on temperature, on the other hand, those of laterite increase on the contrary way of the temperature and vice versa for schist. Several kinetic models (pseudo first order, pseudo second order, Elovich and diffusion models) were evaluated as well as thermodynamic parameters. Absorption reactions are perfectly described by the pseudo second order. Absorption equilibrium data allow defining interval where Langmuir and Freundlich model seems perfect. The proposed retention mechanism suggests the existence of two kinds of sites. DRIFTS analyses of adsorbents after adsorption revealed chemical interaction on adsorption process onto laterite and sandstone. This study demonstrated that laterite, sandstone and shale are an effective adsorbent for phosphate removal from aqueous solution. However, laterite shows a strong potentiality compared to the two others adsorbents
Brouard, Christine. "Contribution à l'étude de la rétention de phénylurées (herbicides) par des adsorbants modèles et des sols". Angers, 1995. http://www.theses.fr/1995ANGE0006.
Texto completoTafoukt, Boulous Djida. "Suivi de réactions biochimiques par calorimétrie en vue de la production de biocarburants de 2ème génération". Thesis, Aix-Marseille, 2016. http://www.theses.fr/2016AIXM4332/document.
Texto completoSecond generation biofuel is developed in a context marked by an increasing demand for primary energy, a decrease in resources and in environmental protection concernsHowever, this biofuel is not economically viable. Optimization, control and knowledge of the kinetics governing this bioethanol production processes are crucial elements.In this study the potential of isothermal calorimetry to monitor hydrolysis and fermentation reactions is tested.The results show that the isothermal calorimetry is an effective method. Indeed this method allowed determining that the substrate/enzyme ratio is an important parameter of the hydrolysis yield.Furthermore it has determined a better enzyme cocktail consisting of Cellulases + Cellobiose Dehydrogenase (CDH) which allows the production of a certain amount of gluconic acid, which could improve the attractiveness of these second-generation biofuels. These same tests also determined the hydrolysis heat of wheat straw which is 32.18 ± 3.18 J.g-1 (gram reducing sugars product).The measurements obtained were used to determine kinetic constants cellulases + CDH on wheat straw and the results show that this enzyme cocktail is faster at 45 ° C in the range of temperatures tested (40 - 55°C) with a speed of 7.36 ± 0.62 mmol/L.min.In addition, testing with a laboratory-scale calorimeter showed that even if this tool does not accurately measure the heat generated by the hydrolysis reaction and fermentation, it gives a good indication of the development and advancement of these reactions
Taneja, Divya. "Développement et caractérisation d’une technique d’interconnexion verticale de puces". Thesis, Université Grenoble Alpes (ComUE), 2018. http://www.theses.fr/2018GREAI037/document.
Texto completoWith the constant demand for reducing the feature size of transistors and that of the devices, which is guided by Moore’s law, 2D integration is no longer fit to adapt the growing demand. This has led to 3D integration of active devices with the help of Cu/Ni pillars capped with Sn based solder alloys. In the coming years, applications which demand high density interconnects (optoelectronic, microdisplays, IR-detectors, MEMS) will require an interconnect pitch of 10 µm and below. However, Cu/Ni/solder pillars have never been investigated in depth for such a small interconnection pitch. With reduction of interconnect dimension, the diameter of Cu/Ni pillar and solder alloy also reduces. Thus, it is feared that the intermetallic formation, which is the key phenomenon responsible for the bonding, may be problematic due to the reduction in size of Cu pillar capped with solder alloy.The thesis is dedicated to the metallurgical study and its characterization for very small interconnects (5 µm) at 10 µm pitch, where the main focus is given on the physio-chemical mechanisms of soldering between Sn-Ag solder alloy and Ni or Ni/Au layers. For the first time, the mechanism of solid-state interactions between Sn and Ni is studied in depth and also for the first time the Ni3Sn4 SLID (Solid-Liquid-lnterdiffusion) system as an interconnect has been investigated at these dimensions. Moreover, the mechanical and electrical properties as well as the thermal stability of these interconnects are studied. Interestingly, during the latter part of this study, Ni3Sn2 layer is observed during aging of the Ni/Ni3Sn4 system for low temperature (200°C)
Martineau, Clara. "Modélisation stochastique du dépôt de particules colloïdales transportées par des écoulements turbulents isothermes et non isothermes". Phd thesis, Université Henri Poincaré - Nancy I, 2013. http://tel.archives-ouvertes.fr/tel-00921279.
Texto completoMartineau, Clara. "Modélisation stochastique du dépot de particules colloïdales transportées par des écoulements turbulents isothermes et non isothermes". Thesis, Université de Lorraine, 2013. http://www.theses.fr/2013LORR0194/document.
Texto completoWe present new results obtained with the generalisation to non isothermal flows of a Near-Wall particle deposition Model (NWM). This work is divided in two parts. The first part consists in coupling the Generalised Langevin Model used to compute the particles statistics in the core of the flow with the NWM that calculates particles motion in the vicinity of the wall. In order to achieve the coupling, we focus on the balance of fluxes of fluid particles crossing the interface between the models. This amounts to assessing if the coupling is valid in the fluid limit case, as non-physical accumulation of fluid particles can occur at the interface. It has lead to theoretical and numerical developments on the conditional statistics of particles crossing an interface. The particle deposition rate is then computed with inertial particles and the model reproduces satisfactorily experimental studies in isothermal flow. In the case of non isothermal flows, particles can experience thermophoresis (which is a mechanism that induces a particle flux in the presence of a temperature gradient) that may strongly affect the particle deposition rate. We thus choose to model thermophoresis in NWM to predict accurate particule deposition in non isothermal flows. We first investigate thermophoresis in gas as it is well explained. Thermophoresis in liquids is then studied. In contrast to the gases, the theory and experiment of thermophoresis in liquids are far from being well established. The last part of this work, dedicated to the modelisation of thermophoresis in liquids in the NWM has lead to new promising numerical results of particle deposition enhanced by thermophoresis
Zammouri, Amel. "Chromatographie de déplacement des acides aminés sur des colonnes de résines anioniques fortes : étude d'un déplaceur propre dioxyde de carbone sous pression dans l'eau". Vandoeuvre-les-Nancy, INPL, 1998. http://www.theses.fr/1998INPL018N.
Texto completoDergal, Fatiha. "Captage du CO2 par les amines demixantes". Thesis, Lyon 1, 2013. http://www.theses.fr/2013LYO10211.
Texto completoNowadays, CO2 capture by amines solvents is the most advanced technology to reduce CO2 industrial emissions. However, this technology presents some concerns. The major problem of this process, using monoethanolamine (MEA), is the high energy needed to regenerate the solvent and makes the process of CO2 capture very expensive. In order to reduce the high cost associated to the energy of regeneration, various breakthrough processes have been studied within the framework of FUI «ACACIA» which include several companies (IFPEN, RHODIA/SOLVAY, ARKEMA, LAFARGE, Gas of France, VEOLIA) and four academic laboratories (LMOPS, LSA, LTIM (ex-LTSP), IRCELyon): - CO2 Capture with gas hydrate formation. - Use of enzymes leading to process of less energy-consuming. - Use of multiamines to increase the quantity of CO2 absorbed or demixing amines which only allow the regeneration of the rich phase in CO2 (low cost for regeneration energy). Our contribution into the consortium has been the study of seven demixing amines or multiamines: - Three commercial amines (the N-Methylpiperidine, 2-Methylpiperidine and the molecule A). - Four « multiamines » with confidentiel structures synthesized by LMOPS and denoted by the initials B, D, E, F. The demixing phenomenon is influenced by many factors such as temperature, the loading of the acid gas and the amine concentration of the solution. The understanding of this phenomenon is one of the objectives of this thesis. The essential data to estimate the potentials efficiency of solvent to capture CO2 is the isotherm of absorption. We have determined these isotherms at temperatures close to the absorber and regenerator units (respectively 40°C and 80°C) at different concentrations of amine ((26%, 30%, 50% and 66%) and pressures of CO2varying between 10 kPa et 200 kPa. The thermodynamic modelling of the isotherms of absorption allows to deduce important operating parameters of the process (cyclic capacity, average enthalpy of reaction, solvent flow...) and to dimension the absorption unit and to estimate its energy consumption. The experimental study has been completed by the determination of vapor-liquid equilibrium of pure amines and of different aqueous solutions of amines with the static method. These data allow anticipating the possible loss in amine in the regenerator. Among the studied amines, the one denoted with the initial « F » is a potential candidate for an industrial application energy-efficient (good CO2 absorption capacity, low regeneration energy, low volatility)
Deborde, Florent. "Etude par spectrométrie mécanique isotherme de l'alliage à mémoire de forme NiTi". Poitiers, 1996. http://www.theses.fr/1996POIT2374.
Texto completoDamidot, Denis. "Etude de l'hydratation du silicate tricalcique en suspensions diluées par microcalorimétrie isotherme". Dijon, 1990. http://www.theses.fr/1990DIJOS036.
Texto completoLounis, Feriel Meriem. "Etude des interactions entre polyélectrolytes de charges opposées par électrophorèse capillaire et titration calorimétrique isotherme". Thesis, Montpellier, 2016. http://www.theses.fr/2016MONTT187/document.
Texto completoThe aim of this thesis is to study the interactions between oppositely charged polyelectrolytes (PE) by frontal analysis continuous capillary electrophoresis (FACCE) and isothermal titration calorimetry (ITC) as a function of the ionic strength of the medium and the physico-chemical properties related to the two partners (chemical charge density, molar mass, ramification). Statistical copolymers of acrylamide and 2-acrylamido-2-methyl-propane sulfonate (PAMAMPS) with chemical charge densities varying between 15% and 100% were synthesized and characterized for this study. Poly(L-lysine) under their linear (PLL) or ramified/hyperbranched (DGL) forms were used as model polycations. Turbidity measurements allowed the study of the stability of the polyelectrolyte complexes (PEC) as a function of the ionic strength of the medium. PEC charge stoichiometries were measured by 1H-NMR, and a general predictive rule that estimates the PEC charge stoichiometry was enounced. The thermodynamic binding parameters (binding constant, stoichiometry, enthalpic and entropic contributions) were determined, by systematically plotting the isotherms of adsorption, and using the model of independent and identical interacting sites. A linear dependence between the logarithm of the binding constants and the logarithm of the ionic strength was observed. This linear dependence confirmed the entropic character of the interactions between oppositely charged PE and allowed quantifying the number of released counter-ions that were compared to the total number of condensed counter-ions. Furthermore, this modelling allowed predicting the binding constants for intermediate chemical charge densities and at different ionic strengths
Bourgeois, Aléxis. "Adsorption et condensation de gaz dans des couches minces diélectriques mésoporeuses suivies par ellipsométrie". Paris 6, 2005. http://www.theses.fr/2005PA066568.
Texto completoSchmittbiel, Jean-Marc. "Modes de recristallisation après forgeage isotherme d'un superalliage élaboré par métallurgie des poudres". ENSMP, 1996. http://www.theses.fr/1996ENMP1006.
Texto completoRemram, Mohamed. "Etude des défauts électriquement actifs induits par recuit rapide isotherme dans le silicium". Grenoble 2 : ANRT, 1986. http://catalogue.bnf.fr/ark:/12148/cb37600699x.
Texto completoGiraud, Stephen. "Croissance de couches minces de silicium pour applications photovoltaïques par epitaxie en phase liquide par évaporation du solvant". Thesis, Grenoble, 2014. http://www.theses.fr/2014GRENI057/document.
Texto completoCrystalline Si thin films on low-cost substrates are expected to be alternatives to bulk Si materials for PV applications. Liquid Phase Epitaxy (LPE) is one of the most suitable techniques for the growth of high quality Si layers since LPE is performed under almost equilibrium conditions. We investigated a growth technology which allows growing Si epitaxial thin films in steady temperature conditions through the control of solvent evaporation from a metallic melt saturated with silicon: Liquid Phase Epitaxy by Solvent Evaporation (LPESE). We studied the main requirements regarding selection of solvent, crucible and growth ambient, and a first experimental set up is designed. An analytical model is described and discussed, aiming to predict solvent evaporation and Si crystallization rate. Growth experiments are implemented with a vertical dipping system. Growth procedure is presented and the influence, on Si growth, of melt convection, temperature gradient in the melt and Si-M reactivity with the material crucible are discussed. Solutions are proposed to improve and optimise the growth conditions. Experimentally, Si thin films were grown from Sn-Si and In-Si solution at temperatures between 900 and 1200°C under high vacuum. We are able to achieve epitaxial layers of several micrometers thickness (20-40µm). The predicted solvent evaporation rate and Si growth rate are in agreement with the experimental measurements. Regarding the structural quality, it is comparable to the crystal quality of layers grown by LPE. With In and In(Ga) melts, we can obtain P-type epitaxial layers with doping level in the range 1017 at.cm3, which is of great interest for the fabrication of solar cells. Finally, the growth of Si thin films on multicrystalline Si substrates by LPESE is discussed to assess the potential application of this technique
Remram, Mohamed. "Etude des défauts électriquement actifs induits par le recuit rapide isotherme dans le silicium". Lyon, INSA, 1986. http://www.theses.fr/1986ISAL0028.
Texto completoTaty-Costodes, Victorien Christian. "Adsorption des métaux lourds cadmium (II) et plomb (II) par la sciure de pin sylvestre : application aux traitements des effluents liquides industriels". Paris 6, 2003. http://www.theses.fr/2003PA066314.
Texto completoCovarel, Grégory. "Etude par spectrométrie mécanique isotherme à basse fréquence d'alliages CuAlNi et relation avec la microstructure". Poitiers, 2001. http://www.theses.fr/2001POIT2255.
Texto completoAbid, Hacini Ouarda. "Adsorption par le charbon actif de micropolluants organiques en solution aqueuse". Grenoble 2 : ANRT, 1987. http://catalogue.bnf.fr/ark:/12148/cb37602060q.
Texto completoChagras, Valérie. "Simulation eulérienne-lagrangienne d'écoulements gaz-solide non isothermes : intéractions particules-turbulence, application aux écoulements en conduite". Nancy 1, 2004. https://tel.archives-ouvertes.fr/tel-00007697.
Texto completoThe aim of this work is to contribute to the numerical modeling of turbulent gas-solid flows in vertical or horizontal non isothermal pipes, which can be found in many industrial processes (pneumatic transport, drying, ). The model is based on an Eulerian-Lagrangian approach allowing a fine description of the interactions between the two phases (action of the fluid upon the particles (dispersion), action of the particles upon the fluid (two way coupling) and between particles (collisions)), more or less influential according to the characteristics of the flow. The numerical developments brought to the model in vertical and horizontal pipe flow have been validated by comparison with available experimental results from the literature. The sensitivity tests highlight the influence of the dispersion model, collisions and turbulence modulation on the dynamic and thermal behavior of the suspension
Balan, Alexandre. "Modélisation isotherme et anisotherme de la limite d'élasticité précipitation-dépendante de l'Inconel 718". Thesis, Lyon, 2017. http://www.theses.fr/2017LYSEI003/document.
Texto completoThis thesis manuscript presents the results of work concerning the effects of thermal transients on the precipitation of intermetallic phases in the nickel-based superalloy Inconel 718® and the consequences of this precipitation on the mechanical properties of this alloy. This work focuses on a coupled approach capable of describing the evolution of the precipitation of the γ'' phase and its consequences on the yield strength of the Inconel 718®. The precipitation state is modeled thanks to the implementation of the equations of the classical germination and growth theory, modified to take into account the platelet geometry of the γ'' precipitates. This precipitation model is then validated by experimental data from the literature but also from transmission electron microscope observations and small angle neutron scattering tests. The size distribution of the γ'' phase thus simulated is used as the input data of a model for predicting the precipitation-dependent elasticity limit. These simulated elasticity limits are finally compared with experimental results from tensile tests. A welding model was then made to test the elastic yield prediction model for thermal transients in an industrial case
Hertz-Clemens, Stéphane. "Etude d'un composite aéraunautique à matrice métallique sous chargements de fatigue : solution mécano-thermique et propagation de fissures". Paris, ENMP, 2002. http://www.theses.fr/2002ENMP1072.
Texto completoArcen, Boris. "Etude par simulation numérique directe du comportement et de la dispersion de particules solides en écoulement non homogène isotherme ou anisotherme". Nancy 1, 2006. http://docnum.univ-lorraine.fr/public/SCD_T_2006_0163_ARCEN.pdf.
Texto completoThis dissertation is devoted to the investigation of the motion of solid particles in an isothermal and non isothermal inhomogeneous turbulent gas flow using direct numerical simulation. By means of this numerical tool, it was possible to analyse the inertia and crossing trajectory effects on the thermal and dynamical characteristics of the dispersed phase as well as on those of the fluid seen. A better understanding of the influence of these two effects is an important issue in the development of Eulerian-Eulerian and Eulerian-Lagrangian models. The study was conducted by extracting dispersed phase statistics such as concentration, mean and root mean square of the particle velocity, fluid-particle covariances, and triple particle velocity correlations. The characteristics of the fluid seen which were examined are the drift velocity, the Reynolds stresses, and the decorrelation time scales of the fluctuating velocity of the fluid seen. Concerning non isothermal flows, we present the thermal statistics of the dispersed phase as well as those of the fluid seen obtained in a downward channel flow. These aspects are investigated keeping in mind the objective of the present study, i. E. Understand the thermal behaviour of the dispersed phase and provide information about crucial parameters which appear in the modelling of such flows
Musso, Jean. "DPAO Diagramme de Phases Assisté par Ordinateur: Représentation et cheminement isothermes et isobares". Phd thesis, Université du Sud Toulon Var, 1989. http://tel.archives-ouvertes.fr/tel-00425051.
Texto completoMusso, Jean. "Dpao : diagramme de phases assiste par ordinateur : representation et cheminement isothermes et isobares". Toulon, 1989. http://www.theses.fr/1989TOUL0003.
Texto completoMuller, Laëtitia. "Etude expérimentale de l'interaction flamme-paroi instationnaire dans des conditions initiales non isothermes". Phd thesis, Chasseneuil-du-Poitou, Ecole nationale supérieure de mécanique et d'aérotechnique, 2012. http://tel.archives-ouvertes.fr/tel-00743578.
Texto completoMcClean, Jennifer Natalie. "Novel isothermal PCR methodologies for the selective detection and analysis of microorganisms in environmental samples". Thesis, Queen's University Belfast, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.557957.
Texto completoBroda, Mickaël. "Détermination de l'énergie d'activation des bétons par voie calorimétrique et mécanique : développement d'un calorimètre isotherme pour béton". Artois, 2002. http://www.theses.fr/2002ARTO0201.
Texto completoThe mechanical properties of concrete evolve in the course of time. This is the consequence of the chemical reactions which proceed during the hydration of the binder. As this one is overall exothermic, the follow-up of the quantity of released heat makes it possible to account for the kinetics of reaction. The devices adapted to concrete being very few, we developed our own isothermal calorimeter accepting 11x22 cm standardized cylindrical samples. After the calibration and the validation of the device, we passed to the second phase of our work which consisted in studying the reaction kinetics and parameters influencing the hydration. We thus studied five compositions of concretes and three compositions of Equivalent Concrete Mortars. The last phase of our work relates to the introduction of calorimetric measurements into maturity measurement studies. Indeed, the economic stakes related to the in situ forecast of young concrete strength are important. The maturity measurement is one of the techniques allowing to estimate this size. It is based on the concepts of "maturity" and "equivalent age", and on the Arrhenius' law which introduces the apparent activation energy parameter. It can be determined by the method of "superposition" from the curves of compressive strength obtained for various temperatures. However, this mode of determination is tiresome. For compositions of concrete and MBE, representative of those concerned with maturity measurement studies, we have compared the calorimetric and mechanical approaches of determination of Ea, and have shown that the calorimetric way can advantageously replace the mechanical way for the determination of this parameter
Doen, Basile Barbara. "Etude par spectrométrie mécanique isotherme de nitrures de silicium et de composites YMgSiAlON/SiC à haute température". Poitiers, 1998. http://www.theses.fr/1998POIT2314.
Texto completoJaeger, Marc. "Simulation numérique d'écoulements turbulents incompressibles et isothermes de fluides newtoniens par éléments finis tridimensionnels". Compiègne, 1990. http://www.theses.fr/1990COMPD273.
Texto completoBoukellal, Ahmed Kaci. "Isothermal solidification of Si and Al-Cu : 3D phase-field simulations". Electronic Thesis or Diss., Aix-Marseille, 2019. http://theses.univ-amu.fr.lama.univ-amu.fr/190924_BOUKELLAL_415xwgus182meagrn974iaa123buxypi_TH.pdf.
Texto completoWe study isothermal solidification of Si and Al-Cu. To this aim, we perfom 3D phase-field simulations using the thin interface models developed by Karma's group. Our numerical conditions are based on the experimental ones. As a result, direct comparison between numerics and experiments leads to quantitative results. Concerning Si, we propose new anisotropy functions for the surface energy and the kinetic attachment. We find out that anisotropy of surface energy is solely responsible of the equilibrium shape, while both anisotropy functions are necessary to obtain acceptable growth shapes.Concerning Al-Cu, we study the growth and interactions of equiaxed dendrites in thin samples cooled isothermally at a constant cooling rate. We propose two scaling laws : one for the maximum growth velocity Vm and the other for the time ΔTm ellapsed between Vm/2 and Vm. Both quantities depend on the distance L between the two initial germs and the alloy concentration C0 but VmΔTm depends only on L. We also show that transition from confined 3D to fully 3D occurs when the sample thickness is increased. Finally, the free growth selection mechanism is found to hold in the fast growth regime even if the instantaneous supersaturation varies with time
Forgeoux, Didier. "Application des structures bainitiques par transformation isotherme et d'un traitement de surface adapté aux vis à haute résistance". Thesis, Belfort-Montbéliard, 2016. http://www.theses.fr/2016BELF0302/document.
Texto completoIn the objective to prevent brittle fracture due to hydrogen (internal or external origins), the usages of mechanicalfastening parts is restricted above 1000 MPa. As already experienced on low-thickness flat products (clips), thebainitic microstructure generated by salt bath quenching is not subjected to hydrogen embrittlement. The target ofthe present study consists in setting up the required knowledge to extend this process to massive parts.In addition to its resistance to hydrogen, only the lower-bainite microstructure is able to meet the mechanicalpropertyspecifications for fasteners. The optimization tool developed in the present framework, has been designedto integrate the particularities of the austenite to lower bainite transformation in salt bath, as well as the ability tosustain cold forming after annealing treatment.A set of mechanical characterizations has been performed on hydrogen saturated bolts. Under a load of 1370 MPa,the bainitic structure has not shown any sign brittle fracture, while it has systematically been the case for thetempered martensitic structure. Furthermore, among the ternary alloys Al-Zr-Zn that can be deposed in vapor phase,a sacrificial grade presenting a protection effect has been identified. However, this effect must be furtherinvestigated, in order to determine the interest for fastening applications
Fortuné, Véronique. "Etude par simulation numérique directe du rayonnement acoustique de couches de mélange isothermes et anisothermes". Phd thesis, Université de Poitiers, 2000. http://tel.archives-ouvertes.fr/tel-00006902.
Texto completoBelarbi, Abla. "Stabilisation par séchage et qualité de la datte Deglet-Nour". Massy, ENSIA, 2001. http://www.theses.fr/2001EIAA0114.
Texto completoRAVI, RANJANI. "A Novel RNA Virus Detection System Based on Duplex Specific Nuclease". University of Cincinnati / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1413820090.
Texto completoRedon, Emmanuel. "Etude de la propagation acoustique en espace confiné en présence d'écoulement non isotherme par la méthode des éléments finis". Poitiers, 1996. http://www.theses.fr/1996POIT2253.
Texto completoManca, Carine. "Physisorption sur des surfaces de glace : étude par couplage entre la manométrie isotherme d'adsorption et la spectroscopie IR-TF". Aix-Marseille 1, 2002. http://www.theses.fr/2002AIX11009.
Texto completoBen, Mansour Abdelkader. "Utilisation d'un système ouvert dans l'étude par microcalorimétrie isotherme des interactions matières premières-humidité et des transformations amorphe-cristallin". Université Joseph Fourier (Grenoble), 1997. http://www.theses.fr/1997GRE18010.
Texto completoGhosh, Satyaki. "Molecular Detection and Quantification of the Fish Pathogen Saprolegnia spp. Using qPCR and Loop Mediated Isothermal Amplification". Bowling Green State University / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1573814311236554.
Texto completoKnani, Salah. "Contribution à l'étude de la gustation des molécules sucrées à travers un processus d'adsorption. Modélisation par la physique statistique". Reims, 2007. http://theses.univ-reims.fr/exl-doc/GED00000736.pdf.
Texto completoAdsorption of sweet molecules on gustatory receptor sites is a determining step in the mechanism of taste chemoreception. Obviously adsorption is a peripheral event. A SMURF device (Sensory Measuring Unit for Recording Flux) is used to obtain experimental psychophysical curves relative to four sweeteners: sucrose, fructose, glucose and maltitol. Through the grand canonical ensemble a treatment of statistical physics is used to develop analytic expressions of the gustatory response in terms of adsorption. The modeling allowed selecting of the double layer model which is used to interpret the adsorption phenomenon. The variation of the number of adsorbed molecules per site permitted proposing of two types of anchorage of a sweet molecule to the adsorbent surface: the first consists in a parallel anchorage and the second is a perpendicular anchorage. We found out a relationship between sweetness potency of molecules and the physical parameters of the model. Hence, a correlation was found between sweetness potency on the one hand and the maximum response, the solubility, and the occupation rate at threshold concentration on the other. In parallel we carried out using a Quartz Crystal Microbalance (QCM) adsorption isotherms of sucrose on three thin layers of porphyrin, calixarene and gold. The modeling of the isotherms by the modified BET model allowed characterization of the adsorption using physicochemical parameters of the model. We showed that the number of molecules per site and the adsorption energies are similar to those of taste. So the sucrose presents the same behavior on these supports as in taste chemoreception
Gaio, Thierry. "Mécanismes de transfert dans les films liquides minces ondés : application à l'absorption du dioxyde de soufre par le diméthyléter tétraéthylène glycol". Toulouse, INPT, 1997. http://www.theses.fr/1997INPT031G.
Texto completoHaydar, Souha. "Adsorption isotherme et désorption thermique du para-nitrophénol sur des carbones activés oxydés et caractérisés par désorption à température programmée". Lyon 1, 1996. http://www.theses.fr/1996LYO10043.
Texto completoFédou, Roland. "Modélisation de l'infiltration chimique en phase vapeur, CVI isotherme et isobare : étude de l'infiltration d'un pore rectiligne par diverses céramiques". Bordeaux 1, 1992. http://www.theses.fr/1992BOR10512.
Texto completoLe, Roux Nicolas. "Etude par similitude de l'influence du vent sur les transferts de masse dans les bâtiments complexes". Phd thesis, Université de La Rochelle, 2011. http://tel.archives-ouvertes.fr/tel-00717838.
Texto completoKhalifeh, Ahmad. "Simulations numériques bi- et tridimensionnelles d'écoulements non-isothermes de fluides anélastiques et viscoélastiques en conduites et dans un système vis-fourreau". Grenoble INPG, 2006. http://www.theses.fr/2006INPG0048.
Texto completoNumerical simulations of inelastic and viscoelastic fluids for non-isothermal flows in two- and three-dimensional geometries are based on multi-disciplinary concepts related to Rheology, Fluid Mechanics, Thermodynamics, Applied Mathematics and Programming. We consider here two- and three-dimensional numerical simulations using the Finite Volume method in 2D and 3D abrupt contractions and in a screw-barrel system. Such flow configurations are of importance from the fundamental and applied points of view, as those concerning extrusion and injection processes. The numerical results highlight a significant influence of the geometrical, thermal and rheological parameters on the flow characteristics
Arcen, Boris. "Étude par simulation numérique directe du comportement et de la dispersion de particules solides en écoulement non homogène isotherme ou anisotherme". Phd thesis, Université Henri Poincaré - Nancy I, 2006. http://tel.archives-ouvertes.fr/tel-00149868.
Texto completoCzarny, Bertrand. "Déterminants moléculaires d’un inhibiteur sélectif de la MMP-12 par approches pluridisciplinaires combinant la cristallographie et la microcalorimétrie". Thesis, Paris 5, 2012. http://www.theses.fr/2012PA05P634.
Texto completoRXP470.1 is one of the first highly potent and selective inhibitor of MMP-12, a zinc protease involved in several human diseases such as atherosclerosis and chronic obstructive pulmonary disease (COPD). To understand the molecular determinants controlling the interaction of RXP470.1 with MMP-12 active site, a multidisciplinary approach combining structure-activity data, crystallography and microcalorimetry have been performed on RXP470.1 and its three analogues. The affinities of the three RXP470.1 analogues have been determined. Then, fourcrystal structures of MMP-12 in interaction with these inhibitors have beendetermined at high resolution, 1.15 Å, 1.50 Å, 1.50 Å et 1.30 Å, respectively. These data have indicated that the presence of a long hydrophobic side chain in the P1’ position of the RXP470.1, which enters deeply inside the S1’ cavity of MMP-12, is playing a key role in the inhibitor affinity. The contribution of this side chain is mostly entropic (-TDS - 4 kcal/mol). The interaction of RXP470.1 with MMP-12 is also mostly driven by a sizeable entropy increase (-TDS= -10 kal/mol) and a more modest enthalpy contribution (DH= -2.5 kcal/mol), despite the observation in the crystal structure of several contacts between inhibitor and MMP-12 active site. Furthermore, this study reveals that the binding of RXP470.1 to MMP-12 is linked to a proton uptake involving two negatively charged residues, the catalytic Glu219 and the phosphoryl group of the inhibitor. Furthermore, despite that the phosphoryl group is considered as a weak zincbinding group, this study highlights that the interactions of this group with the active site zinc atom involved strong directionality between these two groups. This effect has strong impact on the positioning of the other parts of the inhibitor in the MMP-12 active site. This last effect could be responsible for the modest enthalpy increase associated with the binding of RXP470.1 to MMP-12, by preventing the optimization of several interactions between the inhibitor and the enzyme. The results indicate that the role of the zinc-binding group should be better consider in the future. Finally this study opens a new vision in this field and should allow the design of new selective inhibitors of other MMPs
Maddalon, Catherine. "Propriétés physico-chimiques et précipitation de l’oxygène dans le silicium : : modifications induites par le recuit rapide isotherme et application au gettering interne". Lyon, INSA, 1994. http://www.theses.fr/1994ISAL0050.
Texto completoThe properties of oxygen in silicon during various thermal treatments, used for the fabrication of integrated circuits, are studied. First nuclear analyses show a modification of physico-chemical parameters of oxygen during rapid thermal annealing. The diffusion coefficient is enhanced, and the solubility decreases. Moreover, a level is observed in the outdiffusion profile of oxygen, for small durations under a hydrogenated ambient. The oxygen precipitation paths are studied, mainly thanks to Fourier transform infrared spectrometry. To simultaneous paths are available : the formation of the platelets and the growth of spherical precipitates. This latter is predominant when a rapid thermal annealing is prior applied. During an internal gettering process, the same effect is observed. The rapid thermal annealing may introduce a sursaturation of vacancies which would increase the diffusion coefficient and stabilize embryos for spherical precipitates. Thus, the inhibition of internal gettering of chromium by rapid thermal annealing would be due to a modification of oxygen precipitation path. Finally, the complex effect of hydrogen on the properties of oxygen during thermal treatments is shown