Search results for "liquides"
showing 6 items of 6 documents
Eco-extraction and encapsulation of carotenoid and anthocyanin pigments from tropical plants
2018
This thesis deals with extraction processes using assistance technologies or green solvents and encapsulation systems of natural pigments in order to exploit and apply them in the food, cosmetic and pharmaceutical industries. In this goal, microwave-assisted extraction (MAE), ultrasonic-assisted extraction (UAE) and Ionic liquids (IL) were evaluated for the extraction of carotenoids and anthocyanins from Vietnamese plants. The results obtained show that the MAE was always a rapid and helpful system for all types of extraction tested whereas ultrasounds were particularly efficient when pigments are present on the surface of plant tissues. However, UAE was also improving results compared to c…
Synthèse et réactivité chimiques et électrochimiques de dérivés d'imidazoliums : vers des procédés éco-responsables
2015
This work deals with the use of electrochemistry as a tool for alternative synthesis of new azolium-based molecules.A new electrosynthesis method was developed for the synthesis of imidazolium carboxylates (masked carbenes) leading to a wide library of compounds. This approach was compared to already reported chemical syntheses. In the current context of sustainable development, bio based products have been synthesized and optimization of the process was achieved in order to reduce waste and energy consumption.The key role of the hydrogenoxalate anion was demonstrated in the synthesis of ionic liquids and/or imidazolium salts. Some of them were employed as recyclable catalysts for Fischer e…
Contrôle de nano-antennes optiques par une commande électrique : tuner plasmonique et transduction
2011
Optical nano-antennae are the new class of components to control light/matterinteraction at the nanoscale. These devices are operating in the visible to near infraredpart of the spectrum. The properties of these nano objects are controlled by theform, the size and the material.In the radio frequency domain, the tuner changes dynamically the operatingwavelength of the antenna. In this thesis work, we search to transfer this conceptto the nanoscale. The principle is to change the load impedance of the antenna, i.e.changing the optical index of the dielectric medium around the nano-object. Forthat we used anisotropic liquid cristal molecules. The value of the optical index iscontrolled by appl…
Impact de la variabilité climatique sur les apports liquides dans la basse vallée du Mono (Bénin, afrique de l'ouest)
2009
International audience; Les effets de la variabilité climatique et leur conséquence sur les ressources en eau devient une question de plus en plus préoccupante pour les gestionnaires dans le contexte de la Gestion Intégrée des Ressources en Eau (GIRE) dans de nombreuses régions de l'Afrique de l'Ouest en général et du Bénin en particulier. Les données utilisées sont : précipitations, évapotranspiration et débit du bassin-versant du Mono à Athiémé sur la période 1970-2005. La détermination des précipitations de l'ensemble du bassin est faite en fonction des coordonnées géographiques et de l'altitude. L'analyse statistique de ces données a permis de faire ressortir d'une part la tendance du r…
L’instrumentum métallique lié à la cuisine en Gaule romaine
2013
The metal finds associated to storage, food and liquids preparation and cooking comprise multipurpose and specific instruments. The first two phases are illustrated by rather few utensils: buckets, barrels, jugs and boilers, knives and other cleavers. Three cooking patterns are used for the third phase. The first one, simmering, needs hinged cauldrons, assembled or in one piece, maintained above the hearth by suspension chains, but also cauldrons and pots (jars) put down on cooking stands. Grilling needs gridirons, firedogs, braziers and roast spits. At last, for quick cooking with the supply of fat or water which allow to sear food pans and cooking stands are mainly being used. Small imple…
La dimension culturelle de la localisation des sites web : quelles compétences professionnelles pour sortir de l’impasse théorique ?
2018
International audience; Paris, 15-16 novembre 2018 La dimension culturelle de la localisation des sites web : quelles compétences professionnelles pour sortir de l'impasse théorique ? Le site web dans les nouveaux écosystèmes de communication multi-et interculturelle