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Статті в журналах з теми "Extraction sous pression réduite"
Rakib, S., M. Gendry, P. Klopfenstein, R. Saoudi, and J. Durand. "Sulfuration thermique de InP sous pression réduite de vapeur de soufre." Thin Solid Films 187, no. 2 (June 1990): 309–21. http://dx.doi.org/10.1016/0040-6090(90)90052-f.
Повний текст джерелаRoy, C., J. C. Choque, and J. Yang. "Modélisation du transfert de chaleur dans un réacteur de pyrolyse sous pression réduite utilisé pour le traitement des sols contaminés." International Journal of Heat and Mass Transfer 41, no. 18 (September 1998): 2809–19. http://dx.doi.org/10.1016/s0017-9310(97)00273-1.
Повний текст джерелаVillerbu, Tangi. "Pouvoir, religion et société en des temps indécis : Vincennes, 1763-17951." Revue d'histoire de l'Amérique française 62, no. 2 (June 17, 2009): 185–214. http://dx.doi.org/10.7202/037522ar.
Повний текст джерелаMEZHOUD, Khatima, Mebarka BENMOKHTAR, and Dalila SMATI. "Contribution to the study of Fumaria capreolata L. (Papaveraceae), in the Wilaya of Constantine: phytochemical characterization and research of the anti-inflammatory activity." Batna Journal of Medical Sciences (BJMS) 5, no. 1 (December 25, 2018): 26–28. http://dx.doi.org/10.48087/bjmsoa.2018.5107.
Повний текст джерелаFrances, M., M. Vilasi, M. Mansour-Gabr, J. Steinmetz, and P. Steinmetz. "Etude de l'oxydation à 850°C de l'alliage NiCoCrAl(Y)Ta coulé et projeté au chalumeau plasma sous pression réduite." Materials Science and Engineering 88 (April 1987): 89–96. http://dx.doi.org/10.1016/0025-5416(87)90071-1.
Повний текст джерелаRodriguez Ruvalcaba, J. R., B. Caussat, and M. Hémati et J.P. Couderc. "Extension du procédé de dépôt de silicium par CVD en lit fluidisé à des conditions opératoires peu conventionnelles: dépôts sur poudres poreuses et/ou sous pression réduite." Chemical Engineering Journal 73, no. 1 (April 1999): 61–66. http://dx.doi.org/10.1016/s1385-8947(99)00010-8.
Повний текст джерелаDROUIN, M., G. PARRAVICINI, S. NASSER, and P. MOULIN. "Traitement des effluents de désulfuration des gaz d’échappement des navires de transport maritime par filtration membranaire." Techniques Sciences Méthodes 1-2 (February 20, 2023): 27–39. http://dx.doi.org/10.36904/202301027.
Повний текст джерелаSakho, Adama Moussa, Aboubacar Diallo, Kaba Conde, Damany Keita, Mamady Kourouma, Dong Sheng Zhu, and Bangaly Dioumessy. "Synthèse, caractérisation et l’activité anti-tumorale d’un complexe organo-étain carboxylique." International Journal of Biological and Chemical Sciences 14, no. 3 (June 19, 2020): 1133–43. http://dx.doi.org/10.4314/ijbcs.v14i3.38.
Повний текст джерелаGérardin, Pauline, Clément Fritsch, Sylvain Cosgun, Maree Brennan, Stéphane Dumarçay, Francis Colin, and Philippe Gérardin. "Effet de la hauteur de prélèvement sur la composition quantitative et qualitative des polyphénols de l’écorce d’Abies alba Mill." Revue forestière française 72, no. 5 (October 31, 2020): 411–23. http://dx.doi.org/10.20870/revforfr.2020.5338.
Повний текст джерелаYeboue, Lucie N’Guessan, Crolaud Sylvain Bi Tra, Drissa Fondio, and Ange Patrick N’Goran. "Inventaire des papillons (Insecta: Lepidoptera) ravageurs du concombre (Cucumis sativus L.) à Daloa (Centre-Ouest, Côte d’Ivoire)." International Journal of Biological and Chemical Sciences 16, no. 4 (October 30, 2022): 1522–35. http://dx.doi.org/10.4314/ijbcs.v16i4.14.
Повний текст джерелаДисертації з теми "Extraction sous pression réduite"
Dutheil, Camille. "Dépollution des sols par extraction sous pression réduite : étude de quelques paramètres." Lyon, INSA, 2003. http://theses.insa-lyon.fr/publication/2003ISAL0016/these.pdf.
Повний текст джерелаSoil vapour extraction is a treatment process for soils polluted by volatil organic compounds. Its principle relies on the circulation of gaseous flow in soil by the application of a depression of some hundreds millibars. A parametrical study has been led on a soil artificially polluted by trichlorethene. It shows that the gaseous flow rate has a slight influence on pollutants extraction yield. This is due to rate limited mass transfer processes. Soil moisture plays a negative role on treatment efficiency because of the reduction of the porosity available for the gas circulation. Tests have been performed on a soil polluted by a complex mixture of organic pollutants to elaborate a methodology of technical feasibility assessment. This methodology aims at identifying and limiting risks of site rehabilitation failure. Tests results show that soil vapour extraction was inadequat to treat the soil tested in this study because of the strong affinity between a dense organic phase (grease) and chlorinated solvents
Boudouch, Otmane. "Étude de la dépollution des sols par extraction sous pression réduite : application au traitement des COV." Lyon, INSA, 2009. http://theses.insa-lyon.fr/publication/2009ISAL0107/these.pdf.
Повний текст джерелаSoil Vapour Extraction (SVE), which includes gas extraction and/or gas injection, is the primary method used to remove volatile organic compounds (VOCs) from unsaturated subsurface porous media. The widespread use of SVE is due to its above ground simplicity of operation and proven ability to remove contaminant mass inexpensively relative to competing technologies. The objectives of this study may be summarized as follow: - Characterisation of the more appropriate method to determine horizontal and vertical soil air permeability components. - Study of the evolution of soil air permeability as a function of liquids saturation degree. - Verification of the validity or not of the use of unidirectional columns in extraction systems design based on attainment of a critical pore-gas velocity. To accomplish these objectives, a laboratory pilot was designed and realised, a series of experimental tests was conducted and literature models have been used. Results showed that the more appropriate method to determine soil air permeability is the one which involve stationary state in an open soil and that results obtained with a unidirectional column related to critical air velocity can not be extrapolated to field scale as it's currently done
Brusturean, Gabriela Alina. "Dépollution des sols par venting et extraction sous pression réduite : étude expérimentale, modélisation et simulation numérique." Lyon, INSA, 2004. http://www.theses.fr/2004ISAL0075.
Повний текст джерелаThe work of thesis relates to experimental study, modelling and numerical simulation of depollution by venting and SVE of the soils polluted by light hydrocarbons. The first part contains a bibliographical study of pollutants interaction with the soil, of industrial applications of these two techniques and of the modelling techniques used for the follow-up of depollution. The second part is made up of the presentation of the equipments and procedures used for the follow-up of depollution on laboratory pilots. The third part presents the results obtained on soils polluted by components of automobile fuel alone or in mixture with the variation of the operating conditions (gas flow, extraction pressure, ageing of pollution). The agreement between the experimental and modelling (quantified by the factors of agreement) is good, which will allow the use of the developed techniques of calculation for an optimisation of the depollution conditions
Esslimani, Khaoula. "Etude de l´effet des conditions d´application de l’extraction sous pression réduite dans la zone non saturée du sol." Electronic Thesis or Diss., Ecully, Ecole centrale de Lyon, 2024. http://www.theses.fr/2024ECDL0021.
Повний текст джерелаSoil Vapour Extraction stands out as a widely used solution for the in situ remediation of soils contaminated with volatile organic compounds (VOCs). By applying a vacuum to the soil matrix, a flow of air is produced through it, carrying the volatile contaminants to extraction wells that remove the pollutants from the soil. Experimental studies in the laboratory and on site have been carried out to provide a complete analysis of SVE by tracking pollutants in the outgoing gases. An improvement to this technique using the thermal method was studied (T-SVE). Transport and mass transfer during the laboratory experiments were numerically simulated. Two soil models were chosen and characterised: 100% sand (soil 1) and sand mixed with 5% kaolin (soil 2). Experimental set-ups were used to analyse various parameters characterising the extraction system. Hydrodynamic tests were carried out using three different water mass contents in each soil. Experiments on soils contaminated by the two contaminants tested (decane and toluene), in single and double pollution situations, were carried out with samples in dry and wet conditions and at extraction rates of 10 and 16 L.min-1. The experiments were carried out at room temperature and at 60°C. Extraction tests were carried out on a real site contaminated by hydrocarbons. It has been shown that the quantity of mobile water is largely influenced by the composition of the soil. The results obtained showed that the presence of clay in the sand resulted in greater retention of contaminants (adsorption phenomenon) compared with a soil composed solely of sand. Lower elimination times were observed for the contaminant with the highest vapour pressure (toluene). Slight and non-significant decreases in yield, of around 1%, were obtained when going from a flow rate of 16 L.min-1 to a flow rate of 10 L.min-1. It has been shown that increasing the water content of the soil makes the depollution process less effective. The extraction rates of contaminants in double pollution are significantly lower than their extraction rates in monopollution. The T-SVE process, compared with conventional SVE, is more efficient in terms of clean-up time and extraction yield. The trends in pollutant concentration and depression curves obtained in field trials, where conditions are more complex and variable, are similar to those observed in the laboratory. An initial numerical approach to the simulation of mass transport/transfer based on the results of experiments on a 1D column was carried out. The proposed model is capable of simulating the extraction curves with good agreement with the experimental results
Messaoudene, Abdelhamid. "Conception et réalisation d'un simulateur de colonne garnie fonctionnant sous pression atmosphérique et sous pression réduite." Lyon, INSA, 1989. http://www.theses.fr/1989ISAL0060.
Повний текст джерелаGillon, Pascale. "Évaporation des liquides polaires sous pression réduite et/ou sous champ microonde." Dijon, 1986. http://www.theses.fr/1986DIJOS066.
Повний текст джерелаSalhi, Zahir. "Développement des techniques pour le diagnostic des procédés de projection thermique sous pression réduite." Besançon, 2004. http://www.theses.fr/2004BESA2046.
Повний текст джерелаThere is an increasing interest for thermal plasma spraying at working pressure lower than 10 mbars. By spraying at such low pressure, it is expected that resulting coatings have a very low porosity while keeping a deposition rate higher. Developing such processes requires adjusting operating parameters as gas mixtures, arc current and particle injection quantities, among others, in correlation with coatings to produce. Setting input parameters of this new spray processes can be made by measuring characteristics of the plasma and sprayed particles by using optical diagnose techniques. The aim of this study is to develop the use of different tools for optical diagnostics under such conditions. Particle measurements are performed by using the system DPV2000 with its sensor head located in a cooled tube at atmospheric pressure and measuring the particles through an optical window. When particles are too small or too cold to be detected, they are illuminated by a laser diode. In that case particle temperature measurements are not possible anymore but it is still possible to measure the in-flight particle velocity and flux. In addition to particle diagnostics, optical emission spectroscopy is used to quantify the plasma volume and to study the sprayed particle vaporization. The results allowed defining the characteristics of future process chamber to perform thermal spray technique at 0,1mbar pressure
Mohammedi, Kamal. "Contribution à l’étude des garnissages en vrac en distillation sous pression réduite. Mesure d'aires interfaciales." Lyon, INSA, 1992. http://www.theses.fr/1992ISAL0046.
Повний текст джерелаThis work is dealing with hydrodynamics and mass transfer in counter-current random packed columns under reduced pressure. It consists of two parts. The first part is about distillation under reduced pressure. This process is advantageous when heat sensitive and corrosive materials or used solvents are: concerned. In distillation particularly under reduced pressure, many is done but too much is still unknown or unpublished. Hydrodynamics and mass transfer parameters (pressure drop, hold-up residence time distribution , flooding , HETP) are obtained from Raschig rings and Berl saddles packed column. In the second part, highlighting the importance of gas-liquid interfacial area for data interpretation, we measured this parameter by performing and absorption with fast second order irreversible reaction (sulfite-oxygen-cobalt system) under reduced pressure
Cotton, Dominique. "Etude de formation d'hémicarbure de tantale (Ta2C) par l'intermédiaire d'un procédé de cémentation sous pression réduite." Thesis, Dijon, 2015. http://www.theses.fr/2015DIJOS010/document.
Повний текст джерелаTantalum is a very dense metal (d = 16.6) and has a very high melting temperature of 2996°C. This material is particularly required for crucibles used for pyrochemical applications. Early studies show that a carburizing treatment enhances corrosion resistance from liquid metals. Indeed, the intergranular attack of tantalum is stopped by Ta2C precipitates, which occupy the grain boundary regions. The production of the carbon saturated tantalum with Ta2C precipitates requires a good understanding of tantalum carburizing.A carburizing treatment on tantalum sample causes the emergence of a TaC layer on surface and Ta2C layer just below. A reduction of carbon flow has enabled the study of the first steps of tantalum carbides formation. This specific condition of carburizing leads to an epitaxic growth of carbide layers on tantalum substrate. EBSD analysis highlights the crystallographic relations between each phase.Tantalum carbide layers are highly carbon concentrated. So the growth of carbide layers has to be controlled during the carburizing treatment. Several parameters may affect carbide layers growth : process parameters (time and temperature of carburizing treatment) and external parameters such as the reactive surface of the samples. The influence of these parameters on tantalum carbide growth kinetics has been studied. In addition, the diffusion of carbon in tantalum has been modeled with CASTEM© software. Experimental data are used to compute parameters of the model, such as carbon diffusion coefficient in tantalum.Other microstructures than TaC can be obtained on surface by applying an annealing treatment after carburizing. With this treatment, the carbon contained on surface diffuses to the bulk of the metal. Annealing treatment parameters have been determined to get on surface TaC, or Ta2C, or carbon saturated tantalum with Ta2C precipitates
Douyon, de Azevedo Mario. "Etude du dépôt par arc dans le vide de couches minces de carbone sous pression réduite d'hydrogène." Thesis, McGill University, 1990. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=59546.
Повний текст джерелаThe angular distribution of the ionic flux was measured in vacuum as well as under hydrogen pressures. The flux J was found to follow an exponential function of the solid angle $ Omega$ subtended by a cone normal to the cathode surface: J = J$ sb{ rm o}$ exp ($- Omega sp2$ / k$ sp2$).
Another angular distribution of the ionic flux which can be associated with the effusion of a gas from an enclosure by an orifice is J = J$ sb{ rm o}$ cos ($ theta$), where $ theta$ is the angle from the cathode surface normal. This distribution was tested but agrees less with experimental measurements.
The ionic flux is attenuated with distance R to the cathode and gas density n according to J = J$ sb{ rm o}$ e $ rm sp{- n sigma R}$ where $ sigma$ is the cross-section of the carbon ions-hydrogen molecules interaction. The obtained values of the cross-section for a wide range of pressures are in the order of 10$ sp{-17}$ cm$ sp{-2}$. The analysis of the time delays taken by the ions to reach electrostatic probes proved that the attenuation of the ionic flux by the background gas was not due to the photoionization of the hydrogen by radiation emitted from the cathode spots.