Experimental and modeling study of the low-temperature oxidation of large alkanes

This paper presents an experimental and modeling study of the oxidation of large linear akanes (from C10) representative from diesel fuel from low to intermediate temperature (550-1100 K) including the negative temperature coefficient (NTC) zone. The experimental study has been performed in a jet-stirred reactor at atmospheric pressure for n-decane and a n-decane/n-hexadecane blend. Detailed kinetic mechanisms have been developed using computer-aided generation (EXGAS) with improved rules for writing reactions of primary products. These mechanisms have allowed a correct simulation of the experimental results obtained. Data from the literature for the oxidation of n-decane, in a jet-stirred reactor at 10 bar and in shock tubes, and of n-dodecane in a pressurized flow reactor have also been correctly modeled. A considerable improvement of the prediction of the formation of products is obtained compared to our previous models. Flow rates and sensitivity analyses have been performed in order to better understand the influence of reactions of primary products. A modeling comparison between linear alkanes for C8 to C16 in terms of ignition delay times and the formation of light products is also discussed

Experimental and survey-based evidences for effective biotic resistance by predators in ports

International audienc

First Study of the Pyrolysis of a Halogenated Ester: Methyl Chloroacetate

International audienceThe pyrolysis of a halogenated ester, methyl chloroacetate (MC), under dilute atmosphere and quasi-atmospheric pressure was studied at temperatures from 473 to 1048 K using an alumina tubular reactor. MC was chosen as a surrogate to model the thermal decomposition of ethyl bromoacetate, a chemical warfare agent. A maximum MC conversion of 99.8% was observed at a residence time of 2 s, a temperature of 1048 K, and an inlet mole fraction of 0.01. The following products were quantified: CO, CO2, HCl, methane, ethylene, ethane, propene, chloromethane, dichloromethane, vinyl chloride, chloroethane, and dichloroethane. For the first time, a detailed kinetic model of MC pyrolysis was developed and gave a good prediction of the global reactivity and the formation of most of the major products. Flow rate and sensitivity analyses were made to highlight the different pathways of decomposition during the MC pyrolysis. In a first attempt to extrapolate the results obtained with methyl chloroacetate to ethyl bromoacetate, simulations were run with a modified version of the model developed in this study taking into account the differences in bond dissociation energies induced by the change of the chlorine atom by a bromine one

Tournon Jacques, La Merma mágica. Vida e historia de los shipibo-conibo del Ucayali, Lima, Centro amazónico de antropología y aplicación práctica (CAAAP), 2002, 450 p., cartes, tabl., fig., 8 pl. hors texte

Cet ouvrage est la version remaniée de la deuxième thèse de doctorat de Jacques Tournon, qui a commencé sa carrière universitaire dans le domaine des sciences physiques avant de s’intéresser à l’écologie humaine et aux ethnosciences. Dans cet ouvrage, son approche se trouve justement enrichie par sa double formation. Homme de terrain, passionné par l’étude des plantes médicinales, Jacques Tournon a, au cours de plusieurs missions, accumulé une quantité impressionnante de matériaux ethnographi..

Bertrand-Ricoveri Pierrette, Mythes de l’Amazonie. Une traversée de l’imaginaire shipibo, L’Harmattan, Paris/Budapest/Torino, 2005, 320 p., bibl., gloss., ill., photos, dessins

Cet ouvrage propose un riche éventail de mythes d’un des plus grands peuples d’Amazonie péruvienne, les Shipibo. Appartenant à la famille linguistique pano, les Shipibo sont traditionnellement pêcheurs, agriculteurs et, aujourd’hui, renommés pour leur artisanat et leur chamanisme d’exportation. Rédigé dans un beau style littéraire et d’une belle écriture colorée, ce livre fournit une parfaite introduction au lecteur novice qui souhaite s’imprégner de l’imaginaire shipibo. Les « panologues » a..