Dissertations / Theses on the topic 'Conditions de séchage'
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Mendez, Lagunas Lilia Leticia. "L'effet des conditions variables de séchage sur la cinétique de séchage et la qualité de l'ail." Thesis, Université Laval, 2007. http://www.theses.ulaval.ca/2007/24563/24563.pdf.
Full textMendez, Lagunas Lilia. "L'effet des conditions variables de séchage sur la cinétique de séchage et la qualité de l'ail." Doctoral thesis, Université Laval, 2007. http://hdl.handle.net/20.500.11794/19090.
Full textLaguerre, Jean-Claude. "Modélisation du séchage en conditions variables : application de l'analyse compartimentale pour la simulation des régimes transitoires." École nationale supérieure des industries agricoles et alimentaires (Massy, Essonne), 1991. http://www.theses.fr/1991EIAAA001.
Full textNgammongkolrat, Amorn. "Brunissement de la pulpe du pruneau : mécanismes réactionnels, influence des conditions de séchage et de conservation." Toulouse, INPT, 1985. http://www.theses.fr/1985INPT016A.
Full textChavez-Nuñez, Sofia. "Séchage par contact avec agitation de boues résiduaires urbaines : influence de leur origine et des conditions opératoires sur la cinétique de séchage et les caractéristiques des boues séches et des rejets gazeux." Perpignan, 2004. http://www.theses.fr/2004PERP0586.
Full textDrying is an interesting operation before valorization of sewage sludge. The agitated indirect drying of municipal sewage sludge, the caracteristics of these sludges before and after drying, and the composition of exhausted gases during the process have been studied. It has been shown that the sludge origin affects drying kinetics and some properties of dehydrated sludges. The influence of temperature on drying kinetics and on exchange heat coefficient was studied too. Besides, dried sludge granules are sensitive to the residence time in granular phase and attrition of granules was observed. A classification of the samples according to the origin, the diameter and the drying temperature of the granules was derived from infrared spectra by PCA. VOC's in the exhausted vapour have been studied using a coupled TGA-FTIR technique and the analysis of the IR spectra was made by the SIMPLISMA method
Djerrari, Abdellatif. "Influence du mode d'extraction et des conditions de conservation sur la composition des huiles essentielles de thym et de basilic." Grenoble 2 : ANRT, 1986. http://catalogue.bnf.fr/ark:/12148/cb37597196w.
Full textPopa, Aurelian Florin. "Préparation par voie sol-gel et caractérisation de matériaux catalytiques : étude de l'influence du séchage en conditions subcritiques et supercritiques." Poitiers, 2002. http://www.theses.fr/2002POIT2261.
Full textThis work is dedicated to the sol-gel preparation and characterisation of alumina supports and platinum supported catalysts showing a good thermal stability. The gels obtained from aluminium tri-sec butoxide hydrolyzed in excess water are constituted by boehmite crystallites of nanometric size; these small dimensions entail the presence of an important excess of water for the dried samples and explain the high specific surface areas. The introduction of a doping element during the preparation allows an important improvement of the thermal stability of alumina; the best results are obtained for silicon doped samples, at 0. 12 molar ratio. The characteristics of platinum based catalysts depend on the texture and the nature of the support, on the introduction mode of the metal precursor and on the performed thermal treatments. Catalysts supported on silicon-doped alumina turn out very promising for high temperature applications
De, la Cruz Sanchez Carmen Mariella. "Mesure des constantes élastiques du bois d'épinette noire (Picea mariana (Mill.) B.S.P.) dans des conditions d'équilibre du séchage à basse température." Thesis, Université Laval, 2006. http://www.theses.ulaval.ca/2006/23550/23550.pdf.
Full textThe objective of this research was to study the influence of the equilibrium moisture content (EMC) and temperature on the mechanical properties of black spruce wood (Picea mariana (Mill.) B.S.P.). The six specimen technique was used to determine the elastic parameters under eight hygrothermal conditions: four EMC (7%, 13%, 17% and above the fiber saturation point) at two temperatures (30°C and 50°C). Measurements were made in axial compression tests. Axial strain was measured using a Sangamo DG1.0 linear displacement sensor (LVDT). Transverse strain was measured using two semi-ring extensometers. The results show than wood deformability increases as EMC and temperature increase. Furthermore, at the given EMC, wood deformability increases as temperature increases from 30°C to 50°C.
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Mille, Yannick. "Influence des conditions de déshydratation sur la survie des bactéries : rôle de la membrane : application à l'optimisation du séchage de bactéries lactiques." Dijon, 2003. http://www.theses.fr/2003DIJOS016.
Full textSghaier-Ben, Chiekh Nour. "Évaporation en milieu poreux en présence de sel dissous : influence des films liquides et des conditions de mouillabilité." Phd thesis, Toulouse, INPT, 2006. http://oatao.univ-toulouse.fr/7501/1/sghaier.pdf.
Full textBouhlel, Mohamed. "Comportement du béton au jeune âge sous différentes conditions thermiques." Thesis, Université Laval, 2012. http://www.theses.ulaval.ca/2012/28635/28635.pdf.
Full textCementitious materials are used increasingly in the field of civil construction. Several experimental investigations are conducted to better understand the mechanisms controlling the behaviour of concrete and identify the factors responsible to ensure both durability and strength. But the so-called high performance concretes are likely to crack in the first hours after the initiation of the hydration reaction. The durability of concrete is thus affected. This constitutes a challenge for today. This research has been initiated with this perspective in mind. The term young age represents the first days, even the first few hours following the initiation of the reaction of hydration of cement grains. Currently, there is no procedure or experimental setups standardized to assess the behaviour of concrete from an early age. The Research Center on Concrete Infrastructures (CRIB) has developed an experimental device that simulates the behaviour of concrete under conditions of restricted deformation. The assembly, called the assembly for restrained shrinkage deformations (R2D2) was improved as part of this study to help examine the influence of temperature on the behaviour of concrete at early age. Several concrete were formulated and tested based on three types of cements. Five water /cement ratios were tested and several thermal profiles were applied. The influence of the water /cement ratio, the mineralogical composition of cement and the effect of the temperature on the concrete behaviour have been investigated in more depth.
De, la Cruz Sanchez Carmen Mariella. "Utilisation de conduites de séchage oscillantes pour réduire les contraintes liées au retrait du bois." Thesis, Paris, AgroParisTech, 2012. http://www.theses.fr/2012AGPT0068/document.
Full textWood drying is an essential process in the wood industry. A perfect control of wood drying is nowadays very important for the wood industry. In this study, we propose the utilization of oscillating drying conditions to reduce the drying stresses induced by wood shrinkage by activating the mechanosorptive creep. The best way to apply this concept remains an open question in the scientific community. Beech wood (Fagus sylvatica), one of the most commonly used hardwood in France, was chosen for this study owing its elevated risk of drying defaults. The effect of oscillating conditions on drying stresses inside the boards was studied by both an experimental and a theoretical approach, structured in three parts: - A first experimental part realized with a semi – industrial kiln in order to study the global effect of oscillating conditions at the stack scale. Improvement of the quality of dried wood was showed by the best homogeneity of water content inside the board and among the boards and by the decrease of global deformations and residual stresses expressed by the gap measured by the slicing test. - The study was continued with a theoretical part based on analytical and numerical modeling to understand the development of internal heat and mass transfers inside the boards and the evolution of drying stresses during oscillating conditions. A simple analytical model adapted to the oscillating conditions was proposed, particularly for kiln users who don't have access to sophisticated numerical tools. The numerical approach used the simulation tool TransPore, able to simulate oscillating drying in more realistic conditions. Its mechanical module was used to set accurate drying schedules to study the effect of oscillating conditions on stresses relaxation. - Finally, a second experimental part was performed in a laboratory scale kiln, at the board scale, to test the information obtained theoretically. A non-symmetrical drying device (flying wood) and two different loaded drying devices (cantilever beam test and three points bending) were used to study the effect of oscillations. However, it is difficult to see the oscillating conditions effect on the stresses relaxation. The confrontation between experimental results at the board scale and the numerical simulation showed the significant effect produced on experimental results by parasite oscillations of small periods and intensities, originated by the kiln regulation. Further work should consider some modifications of the time dependent mechanical behavior model in order to capture the experimentally observed behavior
Velazquez-Dominguez, Angella. "Effet de la réticulation de la transglutaminase microbienne sur les dispersions de caséine micellaire dans des conditions acides et neutres pour le développement de boissons à haute teneur en protéines." Electronic Thesis or Diss., Université de Lille (2022-....), 2023. http://www.theses.fr/2023ULILR027.
Full textMicrobial transglutaminase (mTGase) is an acyltransferase enzyme that catalyzes the formation of covalent cross-linking, leading to the formation of dimers, trimers, and polymers. The application of mTGase for the modification of the caseins, which represent over 80% of the protein fraction in milk, has been extensively studied, mostly in gel and yogurt applications. Enzymatically modified cross-linked milk powders have just recently been the subject of research. The enzymatic modification of micellar casein powders (MCP), another milk ingredient with an enhanced economic and functionality value, has been less studied.In this context, the thesis project focused on quantitatively studying the impact that the degree of enzymatic cross-linking has on casein molecular structure and apparent viscosity at neutral (7.0) and acidic pH (3.5). In the first part of the thesis (i) cross-linking has been made after the rehydration of neutral micellar casein dispersions at neutral (pH 7.0) and has been studied at neutral and acidic (pH 3.0) conditions. In a second time, (ii) micellar casein retentates have been cross-linked and submitted to a spray-drying operation. The cross-linked MCP were studied in the powder state as well as after rehydration. The quantification of the effect of the storage time and temperature on cross-linked MCP was also evaluated. Finally, (iii) the evaluation of the feasibility of two technological approaches for the development of acidified micellar casein dispersions have been studied. The first approach consisted in acidifying the non-cross-linked and cross-linked MCP to pH 5.0 or pH 3.0 and the second approach consisted in acidifying the non-cross-linked and cross-linked micellar casein retentate to pH 3.5 which was therefore spray-dried.The analysis of the results demonstrated that the enzymatic cross-linking of casein micelles in a model system resulted in a slight casein micelle size reduction, an increased apparent density, and transformed the shape of the casein micelle into a more spherical structure. It was also demonstrated that achieving the maximum ΔDP is important in ensuring the casein micelle's resistance against acidic dissociation, since highly cross-linked micellar caseins have a slight decrease in apparent density and keep a spherical shape.Regarding the spray-drying operation of cross-linked micellar casein retentates to obtain cross-linked micellar casein powders, it was established that mTGase led to an increase in powder particle size and shape, but the rehydration capacity was independent of the cross-linking degree. After being rehydrated, cross-linked MCP depicted a smaller hydrodynamic radius as a result of the prevention of aggregates formation during the spray-drying operation with cross-linking. The molecular changes induced by the cross-linking of MCP were translated into a decrease in the apparent viscosity of MCP dispersions. The aging kinetics of the cross-linked MCP were also evaluated. Although it has been shown that the aging kinetics of cross-linked and non-cross-linked MCP are similar, the initial degree of cross-linking triggers the increase of protein solubility loss, browning index and wetting time increase of MCP.Finally, the use of cross-linked MCP showed that the cross-linking and acidification at pH 3.5 of micellar casein retentates before the spray-drying operation was not suitable for producing functional MCP. On the other hand, the acidification to pH 5.0 and pH 3.0 of cross-linked MCP dispersions was shown to be an appropriate strategy for producing acidified dispersions with a decreased aggregate size and sedimentation rate
Roubeuf, Véronique. "Interactions entre fluides et sédiments argileux naturels : étude expérimentale dans des conditions simulant un stockage souterrain de déchets radioactifs." Nancy 1, 2000. http://docnum.univ-lorraine.fr/public/SCD_T_2000_0190_ROUBEUF.pdf.
Full textNejmeh, Kassem. "Enhancing adhesion and Water Resistance in Clayey adhesives Mixtures : Strategies for Vertical and Horizontal Applications." Electronic Thesis or Diss., Université Gustave Eiffel, 2024. http://www.theses.fr/2024UEFL2012.
Full textEarthen material has long been favored in building construction for its eco-friendly characteristics. Fine clay particles play a crucial role in enhancing the cohesion of such materials. This research focuses on exploring clay-based mixtures as potential substitutes for traditional tile adhesives used on concrete slabs. The objective is to develop a material that exhibits strong adhesion resistance and maintains its integrity even when submerged in water. Considering the porous nature of the clay mixture, adherence to specific drying conditions and immersion periods becomes crucial.The initial stage of the investigation involves conducting a mechanical test to measure the adhesive stress of the material before and after water immersion. A reference soil sample serves as the baseline for evaluating this stress. To influence the mechanical properties, we introduce a proportional amount of polymers or fibers into the reference soil, aiming to alter its cohesive attributes. The selection of polymers or fibers is strategic, intended to induce changes in the material's mechanical properties and its resistance to water.In the subsequent phase, the study focuses on understanding the drying process and imbibition kinetics following the addition of polymers. Additionally, we provide evidence that the choice of polymer significantly affects the kinetics of immersion and the degree of water absorption.The research approach unfolds in three distinctive scenarios: firstly, we enhance the strength of the mortar by incorporating diverse polymers and fibers; secondly, we aim to impede water absorption into the adhesive; and finally, we endeavor to develop a reversible adhesive capable of reclaiming its mechanical strength after experiencing loss due to immersion, solely through a drying process. Moreover, we devise strategies specific to different application methods, addressing both vertical and horizontal applications
"L'effet des conditions variables de séchage sur la cinétique de séchage et la qualité de l'ail." Thesis, Université Laval, 2007. http://www.theses.ulaval.ca/2007/24563/24563.pdf.
Full text"Mesure des constantes élastiques du bois d'épinette noire (Picea mariana (Mill.) B.S.P.) dans des conditions d'équilibre du séchage à basse température." Thesis, Université Laval, 2006. http://www.theses.ulaval.ca/2006/23550/23550.pdf.
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