Search results for "co-conception"
showing 9 items of 9 documents
Degradation mechanisms under hydro-thermo-mechanical loads of natural fibers-reinforced biocomposites : application to the development of lightweight…
2018
With the current environmental concerns, research turns to alternative solutions to synthetic fibres. Vegetal fibers appears as good candidates, with good mechanical properties. However, their low durability is a major issue, especially when the composites are exposed to hydro(hygro)thermal loadings.The purpore of this thesis is to analyse and understand the degradation mechanisms when hydro-thermo-mechanical loadings are applied, in order to implement a predictive modelisation of the composite durability.The manufacturing process wasstudied and optimised to produce reproducible and strong composites. Two materials were produced. Their only difference is their volumetric fiber contents (37.…
Comment conseillers et agriculteurs contribuent au développement d'un modèle d'aide à la décision pour la gestion agroécologique de la flore adventic…
2019
Prod 2019-15kEASPEGESTADINRAAGROSUPDOCT; Afin de réduire l’utilisation d’herbicides, nous avons besoin d'outils pour aider à concevoir des stratégies de gestion des adventices économes en herbicides. Dans ce but, nous avons développé un outil d'aide à la conception de systèmes de culture réconciliant protection des cultures et des écosystèmes. La démarche fait intervenir en parallèle le développement de la structure de ce nouvel outil d’aide à la décision (OAD) en interaction avec les futurs utilisateurs (conseillers et agriculteurs) et une simplification du contenu biophysique du modèle FLORSYS pour l’évaluation des impacts des adventices. L'OAD résultant, DECIFLORSYS, est composé : (1) du…
Green food processing: concepts, strategies, and tools
2019
Abstract One of the developmental aspects of food science is testing and adapting advanced technologies for food production, which save resources and improve food quality. More often than not, this includes technologies operating at lower temperatures, shorter time, and resulting in better preservation of the thermolabile compounds in the foods, as compared to conventional technologies. Nutritionally rich but thermally sensitive raw materials such as fruit, vegetables, meats, and others can particularly benefit from the application of such advanced food technologies. Technologies with the most tested potential for industrial implementation include nonthermal plasma, pulsed electric field, h…
Revelation of aroma potential of grape pomace and spent coffee ground by the use of microbial glycosidases.
2021
The food industry is evolving and tends to reduce its environmental impact, to control its waste and to valorise all of its production. Grapes and coffee are among the main agricultural products in the world and not all of the byproducts resulting from their processing are still valued today. New ways of valorisation are seeked in order to limit production losses. Yet, these byproducts are rich in glycosides, the amount of which may be from two to five times greater than that of the free volatile compounds. Grape pomace and spent coffee ground could be used to naturally produce volatile compounds from their glycosides. These volatile compounds could be useful in the production of cosmetics,…
An optimal dimensioning method of a green wall structure for noise pollution reduction
2021
International audience; This paper concern the optimization of a multilayered green wall structure including substrate and foliage in order to reduce as much as possible backward noise reflection and forward transmission from the wall. Each component involved in the wall structure is fully characterized experimentally to get its transfer matrix. Simulation demonstrated that foliage layer superimposed to substrate layer doesn’t affect the transmission losses but contributes greatly to the increase of return losses of the green wall structure. To achieve the best performances in terms of return and forward losses as well as frequency bandwidth, the methods of optimization are discussed inclu…
Contribution to the development of 100% bio-based composites : synthesis of bio-based polyepoxides, supercritical CO2 treatment of hemp fibers and im…
2018
This thesis contributes to the development of 100% bio-based hemp/epoxy composites. Current environmental issues favor the emergence of materials derived from renewable resources such as plant fibres and a wide range of bio-based building-blocks, source of epoxy prepolymers in particular. An intensive investigation of the two constituents (hemp fibres and polyepoxidic matrix) is carried out before the composites manufacturing. Supercritical CO2 treatment is applied to hemp fibres used as reinforcement in composite materials. This treatment, not optimized, leads to better individualization as well as a decrease in the hygroscopic power of the fibres. These aspects, which are essential in ord…
Mechanical and acoustical behavior of sugarcane and flax fibres reinforced biocomposite
2017
For reasons of comfort, modern constructions require acoustic and thermal insulating materials, offering good mechanical performances. In this context, the valorization of plant fibres from the agro-food industry presents economic and environmental benefits. Thus, the aim of the present study is to develop a multifunctional sugarcane fibres reinforced epoxy porous composite combining good acoustic and mechanical properties.The study of the bagasse fibres geometry has shown that fibres’ length and diameter distribution can be fitted by lognormal laws. Composites manufactured by thermocompression process with an epoxy matrix were characterized using an experimental design whose parameters wer…
Apports de connaissances et méthodes issues de CoSAC pour l’enseignement de spécialisation en école d’ingénieur : exemple du module de conception de …
2019
Prod 2019-15péquipe SPEéquipe EAGESTADAGROSUP; International audience; Les connaissances et méthodes développées dans le cadre de CoSAC ont été utilisés pour l’élaboration de travaux dirigés (TD) dans le cadre du module d’enseignement « conception de systèmes agroécologiques » en troisième année d’école d’ingénieur en agronomie. Ce module a pour objectif de former des étudiants à la conception de systèmes de cultures selon les principes de l’agroécologie. Différents supports issus de CoSAC sont mobilisés : (1) fiches descriptives de techniques innovantes pour la gestion de la flore adventices, (2) grilles de conseils, (3) plateau de jeu afin de réaliser des apports de connaissances sur les …
Atelier de co-conception des systèmes de culture de la plateforme CA-SYS
2018
Durant deux jours, l'INRA de Dijon a reçu une quarantaine de personnes, agriculteurs en semis direct sous couvert, agriculteurs biologiques, expérimentateurs, conseillers, chercheurs, pour initier la conception des systèmes de culture qui seront testés sur la plateforme CA-SYS (https://www6.inra.fr/plateforme-casys/). la première journée est consacrée à des échanges avec le groupe afin de discuter des enjeux autour des systèmes agroécologiques, des expériences de chacun. Cette journée est l'occasion de construire une boite à outils pour la conception des systèmes, en réalisant un inventaire des techniques agroécologiques selon des services attendus (Gestion des adventices, des maladies, des…