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  • image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    Authors: De Perthuis, Christian;

    Le « grand débat sur la transition énergétique » lancé par le gouvernement à lasuite de la conférence environnementale déploie beaucoup d’énergies et accapare l’attention des médias. Ce qui mobilise désormais, ce n’est plus l’action face auchangement climatique, mais la transition énergétique dont le climat ne sembleconstituer que l’une des composantes. La dérive sémantique, observée en France aussi bien qu’à l’étranger, n’est pas anodine : ce concept à géométrie variable peut en réalitéjustifier des orientations et stratégies politiques qui se tournent le dos. Il est urgent de définir avec plus de rigueur ce qu’on appelle une transition énergétique et le type de celle qu’on veut mettre en œuvre. Les implications en sont importantes pour la prise dedécision comme le montre l’exemple du gaz de schiste pris ici en illustration.

    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ Hyper Article en Lig...arrow_drop_down
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      image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ Hyper Article en Lig...arrow_drop_down
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    Authors: Magloire Lanha; José Prudence Fongnikin;

    À l’aube du nouveau siècle, le monde réalise de plus en plus qu’il existe un conflit entre l’humanité et l’environnement. Il ne fait aucun doute que l’humanité soit confrontée à des problèmes environnementaux tels la chute du niveau des nappes phréatiques, les variations de la pluviométrie et la raréfaction des ressources souterraines. La restructuration du patrimoine écologique est donc nécessaire pour faire face à ces problèmes. Pour le faire, il est important de connaitre les causes de la destruction de l’environnement. Cet article propose une identification des facteurs explicatifs de la dégradation de l’environnement. L’analyse porte quatre sur pays de l’Union Economique et Monétaire Ouest-Africaine (UEMOA) à savoir le Bénin, la Côte d’Ivoire, le Sénégal et Togo. Elle couvre la période 1974-2014 et est essentiellement basée sur le modèle “Stochastic Impacts by Regression on Population, Affluence and Technology” (STIRPAT) inspiré de la relation “Impacts, Population, Affluence and Technology” (IPAT). L’estimation du modèle est faite sur la base des méthodes “Fully Modified Ordinary Least Square” (FMOLS) et “Dynamic Ordinary Least Square” (DOLS). Les résultats obtenus montrent que la densité de la population n’a pas une influence significative sur les émissions du dioxyde de carbone. Le produit intérieur brut par habitant, la pratique agraire et l’urbanisation influencent significativement et positivement les émissions de dioxyde de carbone. Ces résultats ont permis de conclure que le produit intérieur brut par habitant, la pratique agraire, l’urbanisation et la consommation de carburants sont les facteurs explicatifs de la dégradation de l’environnement dans ces quatre pays. Journal d’Economie, de Management, d’Environnement et de Droit, Vol 3, No 1 (2020)

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      image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ Journal d’Economie, ...arrow_drop_down
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  • image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    Authors: Rychen, Patrick;

    Keywords: infrastructures routieres ; revetements routiers ; changement climatique ; performances ; ornierage ; dimensionnement au gel ; dimensionnement mecanistique-empirique ; duree de vie ; analyse de risque ; mesures d’adaptation ; road infrastructures ; pavements ; climate change ; performance ; rutting ; frost design ; mechanistic-empirical pavement design guide ; design life ; risk analysis ; adaptation measures These Ecole polytechnique federale de Lausanne EPFL, n° 5611 (2013)Programme doctoral EnvironnementFaculte de l'environnement naturel, architectural et construitInstitut d'ingenierie civileLaboratoire des voies de circulationJury: J.-L. Scartezzini (president), C. Angst, A. Carter, A. Schleiss Public defense: 2013-2-15 Reference doi:10.5075/epfl-thesis-5611Print copy in library catalog Record created on 2013-02-11, modified on 2016-08-09

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    https://dx.doi.org/10.5075/epf...
    Doctoral thesis . 2013
    Data sources: Datacite
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      image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ https://dx.doi.org/1...arrow_drop_down
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      https://dx.doi.org/10.5075/epf...
      Doctoral thesis . 2013
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    Authors: Robert, F.; Meslin, E.; Mary, L.; Manceau, R.; +3 Authors

    La méthode DEXi-Pépi a été développée afin d’avoir une approche globale d’amélioration environnementale, économique et sociale des systèmes de culture hors sol de pépinière. Cette méthode, adaptée du modèle DEXiPM®, est un modèle hiérarchique multicritère et qualitatif qui comporte 89 critères d’entrée : (i) 56 critères dépendants du système de culture, (ii) 23 critères liés au contexte et dépendant du système et (iii) 10 critères liés au contexte et indépendant du système. Plusieurs critères sont redondants dans l’évaluation (26). Le nombre de critère d’entrée par pilier de la durabilité est déséquilibré, reflétant en partie le déséquilibre des connaissances sur certains piliers. Le modèle DEXi-Pépi est un prototype qui est amené à évoluer au fur et à mesure des utilisations et en fonction des attentes des utilisateurs. The DEXi-Pépi method was developed in order to have a global approach for improving aboveground nursery culture systems. This method, adapted from DEXiPM® model, is a hierarchical multi-criteria and qualitative model that includes 89 entry criteria: (i) 56 criteria dependent of the culture system, (ii) 23 criteria linked to the context and system-dependent and (iii) 10 criteria linked to the context and independent of the system. Several criteria are redundant in the assessment (26). The number of entry criteria for each pillar of sustainability is unbalanced, partly reflecting the imbalance of knowledge on some pillars. The DEXi-Pépi model is a prototype that will evolve as the use increases and according to the users’ expectations.

    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ Hyper Article en Lig...arrow_drop_down
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    ProdInra
    Article . 2017
    License: CC BY NC ND
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      image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ Hyper Article en Lig...arrow_drop_down
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      Article . 2017
      License: CC BY NC ND
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    Authors: Piketty, Marie-Gabrielle; Martins de Souza, Maria-Celia; Garcia Drigo, Isabel;

    Au Brésil, les préoccupations environnementales sont croissantes du fait des impacts négatifs d’une croissance agricole accélérée sur l’environnement et les ressources naturelles. Face à ce contexte, la certification environnementale de divers produits issus de l’usage des terres agricoles et forestières augmente. Cet article analyse et compare les cas du bois issu de l’exploitation communautaire en Amazonie et du café bio. La mise en place de ces certifications est-elle à même de concilier efficacité économique, équité sociale et durabilité environnementale ? La comparaison entre ces deux cas vise à mettre en lumière les impacts positifs et négatifs des diverses institutions qui interagissent dans ces processus.

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    Authors: Lacour , Joaneson;

    In rural and peri-urban areas of Haiti, organic wastes and residues generated mainly by agricultural activities and agribusiness, are traditionally valued in situ in animal feeding as feed, in the fertilization of the soil as organic conditioner and/or for energy purposes as fuels. In parallel, the organic wastes of the cities are predominantly eliminated without any form of segregation in non-controlled landfills. This research work aimed to place the emphasis on the opportunity of valuing these wastes by biomethanation as an alternative way of biological treatment of organic biodegradable wastes. The exercise of assessment of organic wastes production has highlighted a loss of wastes-resources estimated at about 2 960 000 tons of dry matter per annum, potentially convertible to 367 500 000 Nm3 of methane or 310 000 toe, corresponding to approximately 16% of recovery of the final energy demand of the households of the whole country. The experimental approach at laboratory scale allowed to assess the ultimate biomethane potential different types of agricultural wastes like bagasse, cabbage and cattle, pigs and chickens manures as well as the possibilities of optimizing the kinetics of anaerobic digestion by some inexpensive means as the reduction of the particles size, the increase of ratio IVS/SVS, the nutrient balance and the synergy effects of co-digestion. The special conditions of implementation of the pilot approach have demonstrated the feasibility of the development of biomethanation technology, with a return period of about 5 years.; Dans les espaces ruraux et périurbains d'Haïti, les déchets et résidus organiques générés principalement par les activités agricoles et agroindustrielles, sont traditionnellement valorisés in situ dans l'alimentation animale comme provende, dans la fertilisation des sols comme amendement organique et/ou à des fins énergétiques comme combustibles. Parallèlement, au niveau des villes, les déchets organiques sont majoritairement éliminés sans aucune forme de ségrégation dans des décharges non contrôlées. Ce travail de recherche a voulu mettre l'accent sur l'opportunité de valoriser ces déchets par la méthanisation approchée comme une voie alternative de traitement biologique des déchets organiques fermentescibles. Le travail d'évaluation des gisements de déchets organiques a mis en évidence que la mauvaise gestion de ces gisements entraine une perte annuelle de matières estimée à près de 2 960 000 tonnes de matière sèche, potentiellement convertibles en 367 500 000 Nm3 de méthane ou 310 000 tep, correspondant à environ 16% de la couverture énergétique finale des ménages à l'échelle nationale. L'approche expérimentale à l'échelle de laboratoire a permis d'évaluer les potentiels biométhanogènes de certaines catégories de déchets d'origine agricole, dont la bagasse, le chou et les déjections de bovins, porcins et poulets, ainsi que les possibilités d'optimisation des cinétiques de digestion anaérobie par des moyens peu onéreux comme la réduction de la taille des particules, l'augmentation du ratio InoculumMV/SubstratMV et les effets de synergie liés à la co-digestion. Des recherches à l'échelle du pilote de terrain ont également été réalisées. Un digesteur a été construit sur le modèle des digesteurs indiens et suivi pendant plusieurs semaines. Malgré les conditions particulières de mise en œuvre du pilote, les essais réalisés ont démontré la faisabilité de la filière avec la technologie rustique sélectionnée. Le temps de retour sur investissement pour un fonctionnement optimal du digesteur pilote a été estimé à 5 ans.

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  • Authors: Bertrand, François; Petit, Sandrine; Vergote, Marie-Hélène; Brayer, Jean-Marc;

    International audience ; How can local collectives for water governance appropriate the issues of adaptation to water resources modified by climate change? The “Climate workshops” held on two territories in Burgundy were observed. Referring to the methods of «territorial design», they gathered local actors and researchers to introduce a collective debate on the adaptation of the water management according to the climate change effects. They represented an unusual participation time, compared to Local Water Commissions which are, in France, the institutional framework of the local water governance. The adoption of an interpretative mode allowed knowledge circulation and hybridization between scientists and local stakeholders. This action-research provides lessons on ways of establishing a dialogue among scientists and non-scientists, the implementation of territorial design methods to deal with uncertainty and a better understanding of representations of adaptation for water management. ; Comment des collectifs locaux de gouvernance de l’eau peuvent-ils s’approprier les questions d’adaptation à une ressource perturbée par le changement climatique ? Des « ateliers du climat », organisés sur deux territoires en Bourgogne ont été observés. Se référant aux méthodes de « design territorial », ils ont réuni acteurs locaux et chercheurs afin d’initier une réflexion collective sur l’adaptation de la gestion de l’eau aux effets du changement climatique. Ils ont représenté un exercice de participation décalé par rapport aux Commissions Locales de l’Eau qui constituent le cadre institutionnel de la gouvernance locale de l’eau. L’adoption d’un mode interprétatif a permis une circulation et une hybridation des savoirs entre scientifiques et profanes. Cette recherche-action apporte des enseignements sur les conditions du dialogue entre scientifiques et acteurs, l’intérêt des méthodes de design territorial pour traiter des incertitudes et sur les conceptions de l’adaptation de la gestion de l’eau.

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    Authors: Ollat, Nathalie; Touzard, Jean-Marc;

    National audience; The paper presents the issues and the first syntheses of LACCAVE project that links INRA researchers working on the adaptation of the wine sector to climate change. The project aims to coordinate and mutually enrich the ongoing works in different disciplines by enrolling the researchers in a Foresight approach. It is based on a holistic view of the technical and value chain. It analyses both forms of impact of climate change and the diversity of adaptation strategies. At first, we review the issues and the definition of adaptation. We then present a summary of the work done on the impacts of climate change and adaptation strategies. Adapatation combines technical innovations (varietal selection, agronomic practices, oenological processes...), with spatial strategies, institutional changes and the possibility of changing representations of wine consumers. In the last part, the LACCAVE project is presented in its general direction and according to its different working packages. In conclusion, implications for research are suggested, highlighting the ability to build cooperative relationships with growers and their organizations across regional clusters. This is one of the main drivers of climate change adaptation.; La communication présente les enjeux et les premières synthèses du projet LACCAVE qui fédère les chercheurs INRA travaillant en France sur l'adaptation du secteur vigne et vin au changement climatique. Le projet vise à coordonner les travaux en cours dans différentes disciplines en les inscrivant dans une démarche de prospective.Il s'appuie sur une vision globale de l'ensemble de la chaine technique et de valeur, permettant d'analyser à la fois les différentes formes d'impact du changement climatique et la diversité des leviers d'adaptation possibles, à plusieurs échelles. Dans un premier temps, nous rappelons les enjeux et la définition de l'adaptation. Nous présentons ensuite une synthèse des travaux réalisés sur les impacts du changement climatique, puis les premières réflexions sur les stratégies d'adaptation. Celles-ci combinent des innovations techniques (matériel végétal, pratiques agronomiques, procédés oenologiques...), avec des stratégies spatiales, des changements institutionnels et la possibilité d'évolution des représentations des consommateurs. Dans une dernière partie, le projet LACCAVE est présenté dans ses orientations générales et selon les différents groupes de travail qui le composent. En conclusion, les conséquences pour la recherche sont précisées, en soulignant que la capacité à construire des relations de coopération avec les viticulteurs et leurs organisations à l'échelle des clusters régionaux est l'un des principaux leviers de l'adaptation au changement climatique.

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  • Authors: Ben-Abdallah, Philippe;

    Mon mémoire d'HDR présente une synthèse de l'essentiel de mes activités de recherche effectuées depuis 1999. Toutefois un certain nombre de mes travaux sur la manipulation optique de nanoobjets, sur la métrologie optique et sur les transferts radiatifs instationnaires ne seront pas discutés dans ce mémoire. Les recherches qui y sont décrites concernent principalement les transferts radiatifs stationnaires dans les milieux semi-transparents denses et hétérogènes et les transferts de chaleur en champ proche dans les matériaux nanocomposites. C'est pourquoi, j'ai choisi de regrouper ces travaux sous le vocable ‘transferts de chaleur par rayonnement dans les matériaux composites micro et nanostructurés'. Les développements réalisés ces dernières années dans le domaine des nanotechnologies autorisent désormais la structuration de la matière à une échelle sub-longueur d'onde jusque dans le domaine visible ce qui permet de sculpter à macro échelle les propriétés radiatives des matériaux composites et de contrôler les échanges radiatifs en champ proche dans ces milieux. La première partie de mon HDR portera sur les transferts radiatifs dans les matériaux nanocomposites à gradient de permittivité diélectrique dans l'approximation de l'optique géométrique. Des avancées spectaculaires ont récemment été faites sur ce sujet grâce aux progrès technologiques réalisés dans le domaine de la nanofabrication. Il est désormais possible de concevoir des matériaux composites complexes pour générer artificiellement une variation spatiale de la permittivité diélectrique et de la perméabilité magnétique . Nous montrerons que cette structuration permet de modeler les trajets optiques et de contrôler le flot d'énergie radiative dans ces milieux. Nous verrons qu'il existe une analogie forte entre la théorie de la relativité générale et l'électrodynamique classique dans un nanocomposite à gradient de permittivité diélectrique (i.e. la lumière expérimente la matière comme un champ gravitationnel effectif). Nous montrerons comment le ...

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    Authors: Lesieur, M; Schertzer, D;

    International audience; 'Nonlocal' interactions have a great effect on the dynamics of energy-containing eddies and the decay of kinetic energy in three-dimensional homogeneous isotropic turbulence. The present paper uses quasi-normal Markovian theory with eddy damping to examine such nonlocal interactions. It is shown that in the limit of infinite Reynolds numbers the kinetic energy spectrum evolves asymptotically in a self-similar way.

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    Authors: De Perthuis, Christian;

    Le « grand débat sur la transition énergétique » lancé par le gouvernement à lasuite de la conférence environnementale déploie beaucoup d’énergies et accapare l’attention des médias. Ce qui mobilise désormais, ce n’est plus l’action face auchangement climatique, mais la transition énergétique dont le climat ne sembleconstituer que l’une des composantes. La dérive sémantique, observée en France aussi bien qu’à l’étranger, n’est pas anodine : ce concept à géométrie variable peut en réalitéjustifier des orientations et stratégies politiques qui se tournent le dos. Il est urgent de définir avec plus de rigueur ce qu’on appelle une transition énergétique et le type de celle qu’on veut mettre en œuvre. Les implications en sont importantes pour la prise dedécision comme le montre l’exemple du gaz de schiste pris ici en illustration.

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    Authors: Magloire Lanha; José Prudence Fongnikin;

    À l’aube du nouveau siècle, le monde réalise de plus en plus qu’il existe un conflit entre l’humanité et l’environnement. Il ne fait aucun doute que l’humanité soit confrontée à des problèmes environnementaux tels la chute du niveau des nappes phréatiques, les variations de la pluviométrie et la raréfaction des ressources souterraines. La restructuration du patrimoine écologique est donc nécessaire pour faire face à ces problèmes. Pour le faire, il est important de connaitre les causes de la destruction de l’environnement. Cet article propose une identification des facteurs explicatifs de la dégradation de l’environnement. L’analyse porte quatre sur pays de l’Union Economique et Monétaire Ouest-Africaine (UEMOA) à savoir le Bénin, la Côte d’Ivoire, le Sénégal et Togo. Elle couvre la période 1974-2014 et est essentiellement basée sur le modèle “Stochastic Impacts by Regression on Population, Affluence and Technology” (STIRPAT) inspiré de la relation “Impacts, Population, Affluence and Technology” (IPAT). L’estimation du modèle est faite sur la base des méthodes “Fully Modified Ordinary Least Square” (FMOLS) et “Dynamic Ordinary Least Square” (DOLS). Les résultats obtenus montrent que la densité de la population n’a pas une influence significative sur les émissions du dioxyde de carbone. Le produit intérieur brut par habitant, la pratique agraire et l’urbanisation influencent significativement et positivement les émissions de dioxyde de carbone. Ces résultats ont permis de conclure que le produit intérieur brut par habitant, la pratique agraire, l’urbanisation et la consommation de carburants sont les facteurs explicatifs de la dégradation de l’environnement dans ces quatre pays. Journal d’Economie, de Management, d’Environnement et de Droit, Vol 3, No 1 (2020)

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    Authors: Rychen, Patrick;

    Keywords: infrastructures routieres ; revetements routiers ; changement climatique ; performances ; ornierage ; dimensionnement au gel ; dimensionnement mecanistique-empirique ; duree de vie ; analyse de risque ; mesures d’adaptation ; road infrastructures ; pavements ; climate change ; performance ; rutting ; frost design ; mechanistic-empirical pavement design guide ; design life ; risk analysis ; adaptation measures These Ecole polytechnique federale de Lausanne EPFL, n° 5611 (2013)Programme doctoral EnvironnementFaculte de l'environnement naturel, architectural et construitInstitut d'ingenierie civileLaboratoire des voies de circulationJury: J.-L. Scartezzini (president), C. Angst, A. Carter, A. Schleiss Public defense: 2013-2-15 Reference doi:10.5075/epfl-thesis-5611Print copy in library catalog Record created on 2013-02-11, modified on 2016-08-09

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    https://dx.doi.org/10.5075/epf...
    Doctoral thesis . 2013
    Data sources: Datacite
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      https://dx.doi.org/10.5075/epf...
      Doctoral thesis . 2013
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    Authors: Robert, F.; Meslin, E.; Mary, L.; Manceau, R.; +3 Authors

    La méthode DEXi-Pépi a été développée afin d’avoir une approche globale d’amélioration environnementale, économique et sociale des systèmes de culture hors sol de pépinière. Cette méthode, adaptée du modèle DEXiPM®, est un modèle hiérarchique multicritère et qualitatif qui comporte 89 critères d’entrée : (i) 56 critères dépendants du système de culture, (ii) 23 critères liés au contexte et dépendant du système et (iii) 10 critères liés au contexte et indépendant du système. Plusieurs critères sont redondants dans l’évaluation (26). Le nombre de critère d’entrée par pilier de la durabilité est déséquilibré, reflétant en partie le déséquilibre des connaissances sur certains piliers. Le modèle DEXi-Pépi est un prototype qui est amené à évoluer au fur et à mesure des utilisations et en fonction des attentes des utilisateurs. The DEXi-Pépi method was developed in order to have a global approach for improving aboveground nursery culture systems. This method, adapted from DEXiPM® model, is a hierarchical multi-criteria and qualitative model that includes 89 entry criteria: (i) 56 criteria dependent of the culture system, (ii) 23 criteria linked to the context and system-dependent and (iii) 10 criteria linked to the context and independent of the system. Several criteria are redundant in the assessment (26). The number of entry criteria for each pillar of sustainability is unbalanced, partly reflecting the imbalance of knowledge on some pillars. The DEXi-Pépi model is a prototype that will evolve as the use increases and according to the users’ expectations.

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    Authors: Piketty, Marie-Gabrielle; Martins de Souza, Maria-Celia; Garcia Drigo, Isabel;

    Au Brésil, les préoccupations environnementales sont croissantes du fait des impacts négatifs d’une croissance agricole accélérée sur l’environnement et les ressources naturelles. Face à ce contexte, la certification environnementale de divers produits issus de l’usage des terres agricoles et forestières augmente. Cet article analyse et compare les cas du bois issu de l’exploitation communautaire en Amazonie et du café bio. La mise en place de ces certifications est-elle à même de concilier efficacité économique, équité sociale et durabilité environnementale ? La comparaison entre ces deux cas vise à mettre en lumière les impacts positifs et négatifs des diverses institutions qui interagissent dans ces processus.

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    Authors: Lacour , Joaneson;

    In rural and peri-urban areas of Haiti, organic wastes and residues generated mainly by agricultural activities and agribusiness, are traditionally valued in situ in animal feeding as feed, in the fertilization of the soil as organic conditioner and/or for energy purposes as fuels. In parallel, the organic wastes of the cities are predominantly eliminated without any form of segregation in non-controlled landfills. This research work aimed to place the emphasis on the opportunity of valuing these wastes by biomethanation as an alternative way of biological treatment of organic biodegradable wastes. The exercise of assessment of organic wastes production has highlighted a loss of wastes-resources estimated at about 2 960 000 tons of dry matter per annum, potentially convertible to 367 500 000 Nm3 of methane or 310 000 toe, corresponding to approximately 16% of recovery of the final energy demand of the households of the whole country. The experimental approach at laboratory scale allowed to assess the ultimate biomethane potential different types of agricultural wastes like bagasse, cabbage and cattle, pigs and chickens manures as well as the possibilities of optimizing the kinetics of anaerobic digestion by some inexpensive means as the reduction of the particles size, the increase of ratio IVS/SVS, the nutrient balance and the synergy effects of co-digestion. The special conditions of implementation of the pilot approach have demonstrated the feasibility of the development of biomethanation technology, with a return period of about 5 years.; Dans les espaces ruraux et périurbains d'Haïti, les déchets et résidus organiques générés principalement par les activités agricoles et agroindustrielles, sont traditionnellement valorisés in situ dans l'alimentation animale comme provende, dans la fertilisation des sols comme amendement organique et/ou à des fins énergétiques comme combustibles. Parallèlement, au niveau des villes, les déchets organiques sont majoritairement éliminés sans aucune forme de ségrégation dans des décharges non contrôlées. Ce travail de recherche a voulu mettre l'accent sur l'opportunité de valoriser ces déchets par la méthanisation approchée comme une voie alternative de traitement biologique des déchets organiques fermentescibles. Le travail d'évaluation des gisements de déchets organiques a mis en évidence que la mauvaise gestion de ces gisements entraine une perte annuelle de matières estimée à près de 2 960 000 tonnes de matière sèche, potentiellement convertibles en 367 500 000 Nm3 de méthane ou 310 000 tep, correspondant à environ 16% de la couverture énergétique finale des ménages à l'échelle nationale. L'approche expérimentale à l'échelle de laboratoire a permis d'évaluer les potentiels biométhanogènes de certaines catégories de déchets d'origine agricole, dont la bagasse, le chou et les déjections de bovins, porcins et poulets, ainsi que les possibilités d'optimisation des cinétiques de digestion anaérobie par des moyens peu onéreux comme la réduction de la taille des particules, l'augmentation du ratio InoculumMV/SubstratMV et les effets de synergie liés à la co-digestion. Des recherches à l'échelle du pilote de terrain ont également été réalisées. Un digesteur a été construit sur le modèle des digesteurs indiens et suivi pendant plusieurs semaines. Malgré les conditions particulières de mise en œuvre du pilote, les essais réalisés ont démontré la faisabilité de la filière avec la technologie rustique sélectionnée. Le temps de retour sur investissement pour un fonctionnement optimal du digesteur pilote a été estimé à 5 ans.

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  • Authors: Bertrand, François; Petit, Sandrine; Vergote, Marie-Hélène; Brayer, Jean-Marc;

    International audience ; How can local collectives for water governance appropriate the issues of adaptation to water resources modified by climate change? The “Climate workshops” held on two territories in Burgundy were observed. Referring to the methods of «territorial design», they gathered local actors and researchers to introduce a collective debate on the adaptation of the water management according to the climate change effects. They represented an unusual participation time, compared to Local Water Commissions which are, in France, the institutional framework of the local water governance. The adoption of an interpretative mode allowed knowledge circulation and hybridization between scientists and local stakeholders. This action-research provides lessons on ways of establishing a dialogue among scientists and non-scientists, the implementation of territorial design methods to deal with uncertainty and a better understanding of representations of adaptation for water management. ; Comment des collectifs locaux de gouvernance de l’eau peuvent-ils s’approprier les questions d’adaptation à une ressource perturbée par le changement climatique ? Des « ateliers du climat », organisés sur deux territoires en Bourgogne ont été observés. Se référant aux méthodes de « design territorial », ils ont réuni acteurs locaux et chercheurs afin d’initier une réflexion collective sur l’adaptation de la gestion de l’eau aux effets du changement climatique. Ils ont représenté un exercice de participation décalé par rapport aux Commissions Locales de l’Eau qui constituent le cadre institutionnel de la gouvernance locale de l’eau. L’adoption d’un mode interprétatif a permis une circulation et une hybridation des savoirs entre scientifiques et profanes. Cette recherche-action apporte des enseignements sur les conditions du dialogue entre scientifiques et acteurs, l’intérêt des méthodes de design territorial pour traiter des incertitudes et sur les conceptions de l’adaptation de la gestion de l’eau.

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    Authors: Ollat, Nathalie; Touzard, Jean-Marc;

    National audience; The paper presents the issues and the first syntheses of LACCAVE project that links INRA researchers working on the adaptation of the wine sector to climate change. The project aims to coordinate and mutually enrich the ongoing works in different disciplines by enrolling the researchers in a Foresight approach. It is based on a holistic view of the technical and value chain. It analyses both forms of impact of climate change and the diversity of adaptation strategies. At first, we review the issues and the definition of adaptation. We then present a summary of the work done on the impacts of climate change and adaptation strategies. Adapatation combines technical innovations (varietal selection, agronomic practices, oenological processes...), with spatial strategies, institutional changes and the possibility of changing representations of wine consumers. In the last part, the LACCAVE project is presented in its general direction and according to its different working packages. In conclusion, implications for research are suggested, highlighting the ability to build cooperative relationships with growers and their organizations across regional clusters. This is one of the main drivers of climate change adaptation.; La communication présente les enjeux et les premières synthèses du projet LACCAVE qui fédère les chercheurs INRA travaillant en France sur l'adaptation du secteur vigne et vin au changement climatique. Le projet vise à coordonner les travaux en cours dans différentes disciplines en les inscrivant dans une démarche de prospective.Il s'appuie sur une vision globale de l'ensemble de la chaine technique et de valeur, permettant d'analyser à la fois les différentes formes d'impact du changement climatique et la diversité des leviers d'adaptation possibles, à plusieurs échelles. Dans un premier temps, nous rappelons les enjeux et la définition de l'adaptation. Nous présentons ensuite une synthèse des travaux réalisés sur les impacts du changement climatique, puis les premières réflexions sur les stratégies d'adaptation. Celles-ci combinent des innovations techniques (matériel végétal, pratiques agronomiques, procédés oenologiques...), avec des stratégies spatiales, des changements institutionnels et la possibilité d'évolution des représentations des consommateurs. Dans une dernière partie, le projet LACCAVE est présenté dans ses orientations générales et selon les différents groupes de travail qui le composent. En conclusion, les conséquences pour la recherche sont précisées, en soulignant que la capacité à construire des relations de coopération avec les viticulteurs et leurs organisations à l'échelle des clusters régionaux est l'un des principaux leviers de l'adaptation au changement climatique.

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  • Authors: Ben-Abdallah, Philippe;

    Mon mémoire d'HDR présente une synthèse de l'essentiel de mes activités de recherche effectuées depuis 1999. Toutefois un certain nombre de mes travaux sur la manipulation optique de nanoobjets, sur la métrologie optique et sur les transferts radiatifs instationnaires ne seront pas discutés dans ce mémoire. Les recherches qui y sont décrites concernent principalement les transferts radiatifs stationnaires dans les milieux semi-transparents denses et hétérogènes et les transferts de chaleur en champ proche dans les matériaux nanocomposites. C'est pourquoi, j'ai choisi de regrouper ces travaux sous le vocable ‘transferts de chaleur par rayonnement dans les matériaux composites micro et nanostructurés'. Les développements réalisés ces dernières années dans le domaine des nanotechnologies autorisent désormais la structuration de la matière à une échelle sub-longueur d'onde jusque dans le domaine visible ce qui permet de sculpter à macro échelle les propriétés radiatives des matériaux composites et de contrôler les échanges radiatifs en champ proche dans ces milieux. La première partie de mon HDR portera sur les transferts radiatifs dans les matériaux nanocomposites à gradient de permittivité diélectrique dans l'approximation de l'optique géométrique. Des avancées spectaculaires ont récemment été faites sur ce sujet grâce aux progrès technologiques réalisés dans le domaine de la nanofabrication. Il est désormais possible de concevoir des matériaux composites complexes pour générer artificiellement une variation spatiale de la permittivité diélectrique et de la perméabilité magnétique . Nous montrerons que cette structuration permet de modeler les trajets optiques et de contrôler le flot d'énergie radiative dans ces milieux. Nous verrons qu'il existe une analogie forte entre la théorie de la relativité générale et l'électrodynamique classique dans un nanocomposite à gradient de permittivité diélectrique (i.e. la lumière expérimente la matière comme un champ gravitationnel effectif). Nous montrerons comment le ...

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    Authors: Lesieur, M; Schertzer, D;

    International audience; 'Nonlocal' interactions have a great effect on the dynamics of energy-containing eddies and the decay of kinetic energy in three-dimensional homogeneous isotropic turbulence. The present paper uses quasi-normal Markovian theory with eddy damping to examine such nonlocal interactions. It is shown that in the limit of infinite Reynolds numbers the kinetic energy spectrum evolves asymptotically in a self-similar way.

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