Search results for "Physico-chimique"
showing 8 items of 8 documents
Contribution to the study of physico-chemical properties of surfaces modified by last treatment : application to the enhancement of localized corrosi…
2011
Metallic materials are more and more used in severe conditions with particularly strong request for improving their behavior in aggressive environment and especially over long periods. The objective of this PhD work is to estimate the potentiality of a laser surface melting treatment on the improvement of the stainless steel 304L corrosion resistance, surface treatments by laser can be revisited on the basis of a recent change in the laser technology. In the frame of this work, a nano-pulsed laser fiber was chosen : it allows the treated surface to be melted for few microns in depth, followed by an ultra-fast solidification occuring with cooling rates up to 1011 K/s. The combination of thes…
Multifunctional biosourced materials : durability of unidirectional recycled matrix composites reinforced with flax fibers
2022
Now more than ever, many engineering sectors are turning to natural fiber composites because of the need for more environmentally friendly solutions. One of the main challenges in developing the use of biocomposites in outdoor applications is the lack of knowledge about their long-term durability. The main objective of this work is to provide a better understanding of the mechanisms involved in photooxidative aging of unidirectional composites made of a virgin or recycled polypropylene matrix, reinforced with long flax fibers. In addition, this work aims to study the potential use of a recycled matrix by comparing the evolution of its behavior to photooxidative aging with a virgin matrix. T…
Incidence and survival of human pathogens in French soils, impact of land use, pedoclimatic and biologic soil factors
2013
Soil contamination by bacterial pathogens can occur through manure, sewage sludge spreading or irrigation using waste water treatment plants effluents. Agricultural soils may act as reservoirs for these pathogens, play a significant role in their dissemination, leading to the potential contamination of food and water resources. Health risk associated with the occurrence of pathogens in environmental matrices has to be thoroughly evaluated. In this context, the objectives of this work were: i) to determine the prevalence of two pathogenic bacterial species (Listeria monocytogenes and Enterococcus faecalis) in a large collection of French soils originated from a systematic soil survey of the …
Etude des propriétés de coordination de nouveaux ligands macrocycliques vis-à-vis de cations métalliques en vue de l'utilisation de leurs complexes p…
2011
Noninvasive medical imaging techniques such as single-photon emission computed tomography (SPECT) or positron emission tomography (PET), are valuable tools for the development and validation of new therapeutic molecules. That approach requires the conjugation of a radioactive source emitting either y-rays or positrons with a biological tracer (e.g. DOTATOC). Among the potentially useful radionuclides available, 111In3+ (SPECT), 64Cu2+, and 68Ga3+ (PET) have attracted increasing attention over the last years for medical applications. To minimize the in vivo release of the radioactive cation by transmetalation or transchelation with biological ligands, it is essential to trap selectively the …
Prévalence de pathogènes humains dans les sols français, effet des facteurs pédoclimatiques, biologiques et du mode d'utilisation des sols
2013
Soil contamination by bacterial pathogens can occur through manure, sewage sludge spreading or irrigation using waste water treatment plants effluents. Agricultural soils may act as reservoirs for these pathogens, play a significant role in their dissemination, leading to the potential contamination of food and water resources. Health risk associated with the occurrence of pathogens in environmental matrices has to be thoroughly evaluated. In this context, the objectives of this work were: i) to determine the prevalence of two pathogenic bacterial species (Listeria monocytogenes and Enterococcus faecalis) in a large collection of French soils originated from a systematic soil survey of the …
Gros plan sur ChemoSens, R&D et expertise en analyses physico-chimique et sensorielle. Une plate-forme du Centre des Sciences du Goût et de l'Aliment…
2016
ChemoSens est une plate-forme de recherche publique du Centre des Sciences du Goût et de l'Alimentation (CSGA, unité mixte de recherche CNRS - INRA - Université Bourgogne Franche-Comté). Son originalité repose sur l'utilisation combinée de la chimie et de l'analyse sensorielle pour développer de nouvelles approches de caractérisation des aliments et du comportement alimentaire.
effect of the extraction of proteins from hemp press-cakes on their functionalities
2019
Plant proteins are a coherent option to feed the planet while limiting global warming. Common proteins (wheat, soya and maize) will soon no longer be sufficient to meet the increased demand for proteins. This thesis focuses on the development of a new source of plant protein for human consumption, based on a co-product of the oil mill: hemp proteins from press-cake. To meet this objective, the three main lines of action are: the definition of extraction conditions, the study of the physico-chemical properties of the isolates extracted under the defined conditions and the study of their emulsifying properties. The data in the literature on the extraction of hemp proteins are limited and not …