Auswahl der wissenschaftlichen Literatur zum Thema „Mécanisme cinétique chimique détaillé“
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Zeitschriftenartikel zum Thema "Mécanisme cinétique chimique détaillé"
Atteia, O., und M. Franceschi. „Conditions chimiques contrôlant l'atténuation naturelle des BTEX et solvants chlorés : un état des connaissances“. Revue des sciences de l'eau 14, Nr. 4 (12.04.2005): 419–44. http://dx.doi.org/10.7202/705426ar.
Der volle Inhalt der QuellePerier-Camby, L., und G. Thomas. „Réaction chimique d’élaboration de BaAI2O4. Étude cinétique et mécanisme réactionnel“. Journal de Chimie Physique 91 (1994): 1763–73. http://dx.doi.org/10.1051/jcp/199491763.
Der volle Inhalt der QuelleVogin, B., F. Baronnet und G. Scacchi. „Étude chimique et cinétique de l'oxydation homogène en phase gazeuse d'alcanes légers. II. Propane et mécanisme généralisé“. Canadian Journal of Chemistry 69, Nr. 1 (01.01.1991): 43–61. http://dx.doi.org/10.1139/v91-008.
Der volle Inhalt der QuelleIddou, Abdelkader, und Mohand Said Ouali. „Étude de l'élimination de Cr(VI) par une boue biologique après épandage“. Water Quality Research Journal 40, Nr. 2 (01.05.2005): 184–90. http://dx.doi.org/10.2166/wqrj.2005.021.
Der volle Inhalt der QuelleCATOIRE, Laurent. „De la cinétique chimique élémentaire aux mécanismes cinétiques détaillés“. Physique Chimie, April 2018. http://dx.doi.org/10.51257/a-v1-af6211.
Der volle Inhalt der QuelleDissertationen zum Thema "Mécanisme cinétique chimique détaillé"
Lacroix, Rémy. „Mécanisme cinétique hétérogène détaillé de dépôt de pyrocarbone“. Thesis, Vandoeuvre-les-Nancy, INPL, 2009. http://www.theses.fr/2009INPL063N/document.
Der volle Inhalt der QuelleIndustrial Carbon/Carbon composite manufacturing processes consist in the densification of a porous substrate (preform) by deposition of gaseous precursors. The aim of this work was to develop and validate a detailed kinetic mechanism modeling heterogeneous reactions of pyrocarbon deposition by propane pyrolysis. Experiments were carried out using an experimental set-up appropriate for studying the kinetics of hetero-homogeneous reactions. Chromatographic analysis were performed to quantify 29 gas phase species, the deposition rate being measured by weighing. We studied the influence of the following experimental parameters: temperature (900-1050°C), residence time (0.5-4 s), S/V ratio (20-170 cm-1) and composition of the reactor inlet (addition of hydrogen, acetylene and benzene). The heterogeneous mechanism contains 275 surface elementary steps involving 66 surface sites. Kinetic parameters of surface reactions were estimated by analogy with gas phase “prototype” reactions. Simulations were carried out using the Surface Chemkin package. The model is efficient to quantitatively predict the deposition rate as well as the mole fractions of major gas phase species. The mole fractions of minor species are semi-quantitatively predicted. The flow rate analysis demonstrates that the pyrocarbon is mostly formed by deposition of methyl radicals and small unsaturated species (acetylene, ethylene) in our experimental conditions
Dmitriev, Artëm. „Kinetic study of ester biofuels in flames“. Electronic Thesis or Diss., Université de Lorraine, 2020. http://www.theses.fr/2020LORR0238.
Der volle Inhalt der QuelleGlobal progress all over the world requires a variety of clean energy sources. Liquid ester-based biofuels seem to be very effective in this context since they are easy to use in modern vehicles, they can be produced from a variety of renewable resources, and they provide environmentally friendly combustion characteristics. In this regard, fatty acid ethyl esters (FAEEs) are considered as a promising class of biofuels. The main goal of this thesis was to develop an updated chemical kinetic mechanism of combustion of light FAEEs up to ethyl pentanoate and validate it against the new experimental data on chemical speciation in low and atmospheric pressure premixed laminar flames. The flames fueled by three FAEEs, ethyl acetate, ethyl butanoate and ethyl pentanoate, were investigated by means of molecular-beam mass-spectrometry and gas-chromatography. More than 40 stable and intermediate species including radicals were detected and quantified in the flames. A comprehensive analysis of the developed mechanism was performed. The thesis consists of 3 chapters. In the first chapter a review of literature is presented. The most important experimental and theoretic studies on FAEEs are discussed. The second chapter presents an overview of experimental and simulation methods used in the work. Details on the mechanism development are also provided in this part. The last chapter present experimental and modeling results on the esters studied in comparison with the literature kinetic mechanisms
Demenay, Aurélien. „Estimation des sensibilités des matériaux énergétiques soumis à divers stimuli. Interprétation de la sensibilité à l’aide de mécanismes cinétiques détaillés“. Thesis, Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLY007.
Der volle Inhalt der QuelleThe main aim of this work is to elaborate predictive tools allowing sensitivity estimation of energetic materials submitted to various stimuli. The main work concerns the calculation of targeted properties of materials having a probable effect on sensitivity predictions. Especially the physico-chemical properties, the thermodynamic properties and properties related to electrostatic potential of the molecule. Prediction is done using correlations established for impact, shock wave, electrostatic discharge, thermal stress and friction. The results are overall good given the current limitations on the subject. Especially there is a lack of quality experimental data and methods for physico-chemical property calculations of energetic materials.The second aim of this work is the study of a potential link between the sensitivity and the auto-ignition delay of energetic materials. Checking this hypothesis requires the development and the use of detailed kinetic mechanisms for a variety of compounds having different sensitivities (RDX, HMX, TNT, TNAZ, NG, PETN, FOX-7, NTO, CL-20). Writing series of reactions, the estimation of rate constants and the calculation of thermodynamic data were carried out. The experimental data available do not allow to validate the mechanisms which must be also improved. At this time it is not possible to assess or not this hypothesis even if trends are such as to confirm it. However, this approach needs to be further worked out
Rullaud, Matthieu. „Modélisation de la combustion turbulente via une tabulation de la cinétique chimique détaillée couplée à des fonctions densités de probabilité. Application aux foyers aéronautiques“. Rouen, INSA, 2004. http://www.theses.fr/2004ISAM0004.
Der volle Inhalt der QuelleTristant, Pascal. „Mécanisme de la réduction carbothermique du dioxyde de titane : Application à l'élaboration du carbure de titane“. Limoges, 1992. http://www.theses.fr/1993LIMO0198.
Der volle Inhalt der QuelleSoudée, Emmanuel. „Liants phosphomagnésiens : Mécanisme de prise et durabilité“. Lyon, INSA, 1999. http://theses.insa-lyon.fr/publication/1999ISAL0049/these.pdf.
Der volle Inhalt der QuelleThanks to their rapidly growing resistance, the magnesia-phosphate cements have been widely used for rapid repairing in English-speaking countries. However, the lack of knowledge regarding the mechanism of setting has slowed down their use and the goal of this work is to understand the process of crystal evolution. It was an acid base reaction between magnesia powder and a solution of mono-ammonium phosphate. When being in contact with mixing water, the kinetics of magnesia wetting depends on its surface condition whereas its dissociation is due to the acidity of the solution. Then, Mg2+ ions react with the water molecules to form hydrated compounds, Mg(H2O)62+. These complexes can substitute to water molecules during magnesia wetting and remain stuck on the surface they progressively recover. These surface layer can be the beginning of the crystallization of the struvite network which is made up of PO43-, NH4+ and Mg(H2O)62+ polyhedrons held together by hydrogen bonds
Korovitch, Alexandre. „Mécanisme de formation de complexes de césium : Norbadione A, Dérivés et Calixarènes“. Paris 7, 2010. http://www.theses.fr/2010PA077135.
Der volle Inhalt der QuelleDuring the Chernobyl disaster in 1986, a cloud of several radioactive isotopes, including Cs was released into the environment. The half-life of ¹³⁷Cs is 30 years. A substantial part of the ¹³⁷Cs was complexed by Norbadione A (NbA) and accumulated in the bay boletus mushroom. This led to contaminations of game meat and people all over Europe. We used the methods and techniques of chemical relaxation (stopped-flow and T-jump) to establish the mechanisms involved in the complex formation between NbA and Cs⁺. One of the major problems encountered with NbA is the diffîculty in detecting the Cs⁺ complex by spectrophotometric techniques. To overturn this obstacle, we used two Cs⁺-selective fluorescent calix[4]arene probes. Complex formation between Cs⁺ and the two calixarenes is slower than expected (few ms). This can be related to the rigid structure, the steric effect and other factors which lead to the necessity of the calixarene cavity to adapt its size and conformation to the large Cs⁺ alkali cation. We determined the mechanisms involved in the complex formation between NbA and Cs⁺ and measured the implicated kinetics and thermodynamics constants in alcohol and aquo-alcoholic mixtures. NbA forais strong complexes with Cs+ ((K₁ ≈ 10⁵ and K₂ ≈ 10³, in ethanol). Complex formation occurs with the two enolates and the two carboxylates of NbA. This affïnity for Cs⁺ can be related to the flexibility of the two pulvinic acids, allowing them to adopt an inclusion cavity conformation
Simonnet, Marie. „Dissolution de l’oxyde de thorium : cinétique et mécanisme“. Thesis, Paris 11, 2015. http://www.theses.fr/2015PA112226/document.
Der volle Inhalt der QuelleStudies of new energy sources are necessary to meet the rising global demand. In the nuclear area, Th-U cycle has been reinvestigated to supplement or replace the currently used U-Pu cycle. This project though needs further improvement to be operated in an industrial plant, especially on the reprocessing process, which consists in fuel dissolution in nitric acid medium, followed by liquid-liquid extraction. Still, unlike uranium, thorium oxide does not dissolve in concentrated nitric acid. Small amounts of fluoride are required to achieve the dissolution. The dissolution is rather slow and HNO₃-HF mixture is very corrosive. The aim of this project is thus to find an efficient dissolution method which both decreases corrosion and improves dissolution rate. The synthetized thorium oxide powder has been dissolved in chosen conditions. Effects of solid parameters, dissolution method and dissolution medium have been studied. Results show a strong dependence on oxide crystallinity. No improvement on dissolution rate was observed with power ultrasounds, except for the temperature increase, which greatly enhances dissolution rate. No other complexing agents than fluoride allows total dissolution. Rising HNO₃ and HF concentrations increases dissolution rate until the amount of fluorides is so high that a precipitate forms at the surface. This study led to the proposal of a dissolution mechanism whose limiting step is the formation of an activated complex. Based on kinetics and equilibrium equations, initial dissolution rate was then written as a function of the different studied parameters. Experimental results were finally fitted by this relation to find kinetics and thermodynamics constants, proving the accuracy of the proposed mechanism
Naubron, Jean-Valère. „Réaction d'échange sur des aminophosphines : mécanisme et stéréochimie. Etudes théoriques et expérimentales“. Aix-Marseille 3, 2005. http://www.theses.fr/2005AIX30058.
Der volle Inhalt der QuelleNucleophilic substitution reaction of an amino group on a trivalent phosphorus atom by an amine has been investigated. The postulated mechanism based on oxidative addition of the amine on the phosphorus centre, leading to an intermediate hydridophosphorane species, followed by reductive elimination of a second amine molecule, as well as alternative mechanisms, have been dismissed by DFT calculations. Besides, kinetic measurements by 1H NMR showed a spectacular effect of acidic catalysis. Hence, new protocatalytic mechanisms corresponding to various reaction paths and exhibiting low activation barrier, around 10 kcal. Mol-1, are proposed. Therefore, the predicted stereochemistry for the reactions strongly depends on the reaction pathway. The CPCM model was used to take in account solvent effects. Solvent cavity was parameterized to calculate accurately the pKa of phosphazenes and phosphines in acetonitrile
Luche, Jocelyn. „Obtention de modèles cinétiques réduits de combustion : application à un mécanisme de kérosène“. Phd thesis, Orléans, 2003. http://www.theses.fr/2003ORLE2019.
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