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- 13. Climate action
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- 11. Sustainability
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Research data keyboard_double_arrow_right Dataset 2022Publisher:Franche-Comté Electronique Mécanique Thermique et Optique - Sciences et Technologies (UMR 6174) Authors: Boulon, Loïc;Cette modélisation présente la partie de contrôle d'une pile à combustible à membrane d'échange de protons (PEMFC). L'objectif du modèle de représenter la chaîne de contrôle de la tension de la PEMFC. Ce modèle est basé sur une représentation macroscopique énergétique (REM) de la pile à combustible, puis conduit à une structure dite de contrôle maximal (SCM). La SCM est une inversion étape par étape de la REM (structure de contrôle basée sur un modèle d'inversion). Le processus de conception de la commande est basé sur une définition explicite du problème. Par exemple, les entrées de réglage, les objectifs du système ou les contraintes sont mises en évidence pour organiser la commande. De plus, le SMC montre les endroits où les capteurs sont nécessaires et où les contrôleurs sont requis. Malheureusement, le SCM n'est qu'une structure de contrôle théorique. Par conséquent, une structure réaliste nécessite certaines simplifications, ce qui conduit à une structure de contrôle dite pratique. This modeling presents the control part of a proton exchange membrane fuel cell (PEMFC). The objective of the model is to represent the voltage control chain of the PEMFC. This model is based on an energetic macroscopic representation (EMR) of the fuel cell and then leads to a so-called maximum control structure (MCS). The SCM is a step-by-step inversion of the REM (control structure based on an inversion model). The control design process is based on an explicit problem definition. For example, control inputs, system objectives, or constraints are highlighted to organize the control. In addition, the MSC shows where sensors are needed and where controllers are required. Unfortunately, the SCM is only a theoretical control structure. Therefore, a realistic structure requires some simplifications, which leads to a so-called practical control structure. AdditionnalInformation: Modèle créé lors d'une thèse en génie électrique, par Loïc Boulon (ses recherches portent sur la modélisation et le contrôle des véhicules électriques hybrides, des sources d'énergie et d'énergie et de puissance, et des systèmes de piles à combustible). Il a travaillé en vue de l'obtention du diplôme de doctorat à l'Université de Franche-Comté, Belfort, France, où sa thèse de doctorat a été réalisée en collaboration avec le FEMTO-ST, Belfort, et les Laboratoires L2EP, Lille. Co-encadrement par Daniel Hissel (PU au laboratoire FEMTO-ST), Alain Bouscayrol (PU au laboratoire L2EP) et Marie-Célie Péra (PU au laboratoire FEMTO-ST) AdditionnalInformation: Model created during a thesis in electrical engineering, by Loïc Boulon (his research focuses on the modeling and control of hybrid electric vehicles, energy and power sources, and fuel cell systems). He worked towards his Ph.D. degree at the University of Franche-Comté, Belfort, France, where his dissertation was complet in collaboration with the FEMTO-ST, Belfort, and the L2EP Laboratories, Lille. Co-supervision by Daniel Hissel (PU at FEMTO-ST laboratory), Alain Bouscayrol (PU at L2EP laboratory) and Marie-Célie Péra (PU at FEMTO-ST laboratory) Données computationnelles ou de simulation: - Langage de programmation : Langage Matlab - Plate-forme/OS : Microsoft Windows, Mac OS, Linux,... - Version : MATLAB R2018a - Statut de développement : Actif Simulation or computational data: - Programming language: Matlab language - Platform/OS: Microsoft Windows, Mac OS, Linux,... - Version: MATLAB R2018a - Development status: Active Project: Thèse de doctorat en génie électrique - Loïc Boulon, Contrat doctoral (Region Bourgogne Franche-Comté) Label: PHE (Plateforme Hydrogène-Energie) Audience: Research
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For further information contact us at helpdesk@openaire.euResearch data keyboard_double_arrow_right Dataset 2021Publisher:Fuel Cell Lab (UAR 2200) Authors: Morando, Simon; Pahon, Élodie; Pahon, Élodie;Le projet PHM-PAC vise principalement le développement de méthodes intelligentes de détection, diagnostic et pronostic des défaillances de piles à combustibles. Ce projet doit permettre l'optimisation des performances des systèmes pile à combustible ainsi qu'une meilleure compréhension des phénomènes électrochimiques en affectant la durabilité. The PHM-PAC project is mainly aimed at developing intelligent methods for the detection, diagnosis and prognosis of fuel cell failures. This project should allow the optimization of the performance of fuel cell systems as well as a better understanding of the electrochemical phenomena affecting the durability. Données expérimentales: 2 800 heures de fonctionnement à charge constante sur une pile à combustible à membrane échangeuse de protons d'une puissance de 500W Experimental data: 2,800 hours of operation at constant load on a 500W proton exchange membrane fuel cell Project: PHM PAC, Région Bourgogne Franche-Comté (Region Bourgogne Franche-Comté) Audience: University: master, Research, University: licence Label: PHE (Plateforme Hydrogène-Energie) Label: Plateforme UBFC (Plateforme UBFC) UpdatePeriodicity: no update
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For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Other literature type 1982 FrancePublisher:ISTPM Heral, Maurice; Razet, Daniel; Deslous-paoli, Jean-marc; Berthome, Jean-paul; Garnier, J.;Les grandes caractéristiques hydrobiologiques du bassin de Marennes-Oléron sont définies par quatre campagnes saisonnières de 120 prélèvements chacune effectuée-, en 15 stations en demi-cycle de marée. Les salinités y fluctuent de 10 '/rr. et ce secteur peut donc être assimilé à un vaste estuaire contrôlé principalement par les apports fluviaux de la Charente. La turbidité reste élevée souvent supérieure à 100 mg.I"', les teneurs en oxygène dissous montrent un déficit en amont de la Charente et de la Seudre de 4 mg.L1 tandis que les sels nutritifs sont apportés par la Charente pour les nitrates, phosphates et silicates. Ces derniers suivent les courbes de dilution théorique excepté lors des poussées phytoplanctoniques et lors des crues hivernales. Lors de ces crues, les nitrates semblent soit apportés par la Gironde, soit dus à une minéralisation organique. Au même moment, les phosphates pourraient être absorbés sur les particules et être piégés dans les sédiments. Les biomasses phytoplanctoniques exprimées par les teneurs en chlorophylle a sont supésieures à 30 f^-g.1 ' en amont des estuaires au printemps avec des teneurs en phéopigmenls pouvants dépasser 200 IUJ.1 . par contre, dans le bassin, les teneurs ne dépassent guère 10 fig.l ''. Les concentrations en ATP montrent que peu de phytoplancton est physiologiquement actif en particulier dans les estuaires, tandis que les dosages de protéines permettent de quantifier la part des apports allochtone - par rapport à la production autochtone des estuaires. Line analyse factorielle des correspondances définit le schéma général hydrobiologique du bassin estuarien en précisant que 'e rôle de la Charente ne se limite pas à l'apport en sels minéraux azotés et phosphatés, mais aussi à l'apport d'une biomasse phytoplanctonique d'eau douce en voie de dégénérescence. Les auteurs proposent qu'une nouvelle stratégie d'échantillonnage, mieux adaptée aux objectifs recherchés, soit suivie ultérieurement en assurant des prélèvements en cycle de marée mais avec une périodicité la plus élevée possible. Four seasonal compaigns providing a sampling of 15 stations each followed during half a tide cycle, i.e. 120 water samples permit the definition of the main hydrobiological features of Marennes-Oleron Bay: salinity and turbidity, phytoplanktonic biomasses, ATP concentrations. The authors suggest that a new way of adapted sampling to their objectives, will work out in the future by sampling during tidal cycles but as frequently as possible.
ArchiMer - Instituti... arrow_drop_down ArchiMer - Institutional Archive of IfremerOther literature type . 1982Data sources: ArchiMer - Institutional Archive of Ifremeradd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
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visibility 59visibility views 59 download downloads 28 Powered bymore_vert ArchiMer - Instituti... arrow_drop_down ArchiMer - Institutional Archive of IfremerOther literature type . 1982Data sources: ArchiMer - Institutional Archive of Ifremeradd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
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For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Other literature type , External research report , Report , Preprint 2013 FrancePublisher:Unknown Funded by:UKRI | End to End logistic suppo...UKRI| End to End logistic support tools for effective aerial drone delivery against COVID-19Authors: Gohin, Alexandre; Gohin, Alexandre;[Paper in French] The European public policy in favor of the biodiesel consumption is highly debated. Available estimates of the induced land use changes conclude that this policy is inefficient to reduce emissions of GreenHouse Gas. We show that the crop yield evolutions in these estimates are significantly lower than the observed and expected evolutions. This difference is directly related to biased calibration choice of behavioral parameters. We show using the GTAP-BIO framework that a consistent calibration of these parameters leads to a strong reduction (by around 80% in the long run) of the land use changes and induced emissions.
Hyper Article en Lig... arrow_drop_down INRIA a CCSD electronic archive serverReport . 2013Data sources: INRIA a CCSD electronic archive serveradd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
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For further information contact us at helpdesk@openaire.euAccess RoutesGreen 3 citations 3 popularity Average influence Average impulse Average Powered by BIP!
more_vert Hyper Article en Lig... arrow_drop_down INRIA a CCSD electronic archive serverReport . 2013Data sources: INRIA a CCSD electronic archive serveradd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
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For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Other literature type 2009 FrancePublisher:Ecole Centrale de Nantes Authors: Saulnier, Jean Baptiste;This work focuses on the refinement of sea-states spectral characterisation in the frame of the development of wave energy converters (WECs). Until now, this characterisation has been limited to the consideration of basic global parameters such as the significant wave height and mean wave period. The present work namely underlines - thanks to simplified numerical models - that such a description is not sufficient to account for the performance of WECs, for they still exhibit a large variability in terms of mean production while wave energy and period are fixed. It is therefore needed to refine this description by introducing new wave characteristics, such as the wave groupiness, which is itself related to the sea-state's spectral bandwidth. The classical - spectral - approaches, allowing a statistical analysis of wave groups along with other works in the literature, permit to draw a set of relevant spectral parameters. The sensitivity of simplified offshore WEC models (linear in the frequency domain) to these parameters is then observed. The question of deterministic mean power estimation - namely in the case of non-linear models - is also raised, for it is also related somehow to the bandwidth of the wave field. A sea-state is actually made of a superimposition of various wave systems (as swells and wind-sea). It is then possible to refine even more its description, namely through the multi-system approach. The latter enables indeed to track in time and space the wave systems independently of each other. An algorithm for the automatic spatiotemporal analysis is proposed and illustrated to this end. Lastly, the influence of such description refinements (wave groupiness and multi-system approach) is observed at several locations (Portugal, North Sea, California) by considering various WEC models (linear axi-symmetric heaving devices, 3D SEAREV with non-linear hydrodynamics): in all cases, it is shown that both extended descriptions allow for a better characterisation of the mean WEC performance at both short and long term. Ces travaux portent sur la caractérisation spectrale des états de mer dans le cadre du développement de systèmes récupérateurs de l'énergie des vagues (SREVs). Jusqu'alors, cette caractérisation s'est limitée à des paramètres globaux basiques tels que la hauteur significative et la période moyenne des vagues. Les présents travaux soulignent notamment, à l'aide de modèles simplifiés, que cette description est insuffisante car un SREV montre encore une grande variabilité en termes de production moyenne, ces deux paramètres étant fixés par ailleurs. On s'intéresse donc à raffiner cette description en considérant des caractéristiques de vagues nouvelles, comme le groupement de vagues, lui-même lié à la largeur de bande de l'état de mer. Les approches classiques - spectrales - sur l'étude descriptive des groupes de vagues et la littérature permettent de dégager un certain nombre de paramètres spectraux. On observe ensuite la sensibilité de modèles de SREVs offshore simplifiés (modèles fréquentiels linéaires) à ces paramètres de largeur globale. La question de l'estimation déterministe de performance moyenne (dans le cas de convertisseurs non-linéaires) est également abordée, étant elle-même liée à cette caractéristique. Un état de mer étant constitué de plusieurs systèmes de vagues (houles, mer de vent), il est encore possible de raffiner sa description grâce à une approche multisystème. Celle-ci permet en outre de suivre ces systèmes indépendamment dans le temps et l'espace. Un algorithme d'analyse spatio-temporelle est proposé et illustré à cet égard. Enfin, l'influence de ces raffinements est observée en différents sites (Portugal, Mer du Nord, Californie) sur des cas de SREVs divers (systèmes axi-symétriques linéaires, SEAREV 3D d'hydrodynamique non-linéaire), et montre que dans tous les cas, le raffinement apporté permet de mieux caractériser la production à court et long terme de ces dispositifs.
ArchiMer - Instituti... arrow_drop_down ArchiMer - Institutional Archive of IfremerOther literature type . 2009Data sources: ArchiMer - Institutional Archive of Ifremeradd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
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visibility 24visibility views 24 download downloads 15 Powered bymore_vert ArchiMer - Instituti... arrow_drop_down ArchiMer - Institutional Archive of IfremerOther literature type . 2009Data sources: ArchiMer - Institutional Archive of Ifremeradd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
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For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Other literature type , Preprint 2014Publisher:Unknown Tamini, Lota D.; Clerkson, Frédérick; Doyon, Maurice; Debailleul, Guy; Tamini, Lota D.; Clerkson, Frédérick; Doyon, Maurice; Debailleul, Guy;Climate change will affect agricultural production conditions, which will translate in impacts on yield and cost of production for Quebec farmers. This would likely affect the relative competitive position of Quebec in North America. Using the Delphi technique and partial budgets, climate change scenarios for the 2050 period were elaborated and their impact on relative competitiveness assessed for Quebec and its competitors in North America. Results indicate that Quebec competitive position would improve due to more favorable conditions for corn and apple production and due to worsen conditions for the competitors in maple syrup production.
Research Papers in E... arrow_drop_down add ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
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For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Other literature type 1984 FrancePublisher:Actes de colloques. Ifremer. Brest [ACTES COLLOQ. IFREMER.]. 1984 Funded by:NSERCNSERCAuthors: Maestrini, S; Rochet, M; Legendre, L; Demers, S;Nutrient analyses were done in melted ice, frazil and sea water of the upper part of the water column, where as major constitutive elements of micro-algae were analysed. Measurements of nutrient uptake were carried out with frazil algae incubated at -1.5 degree C in a field incubator. Differential-enrichment bioassays and mean N/P ratio (5.9) demonstrated that actual growth of the cultures was nutrient-limited. Nitrogen governed the algal yield when illumination and grazing allowed the microalgae to grow. It concluded that the epontic dynamics is not only controlled from above, by the seasonal (climatic) changes in light intensity as generally assumed, but also from below, by the short-term (hydrodynamic) events of vertical mixing that replenish the ice-water interface in nutrients.
ArchiMer - Instituti... arrow_drop_down ArchiMer - Institutional Archive of IfremerOther literature type . 1984Data sources: ArchiMer - Institutional Archive of Ifremeradd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
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visibility 3visibility views 3 download downloads 1 Powered bymore_vert ArchiMer - Instituti... arrow_drop_down ArchiMer - Institutional Archive of IfremerOther literature type . 1984Data sources: ArchiMer - Institutional Archive of Ifremeradd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
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For further information contact us at helpdesk@openaire.euResearch data keyboard_double_arrow_right Dataset 2022Publisher:Franche-Comté Electronique Mécanique Thermique et Optique - Sciences et Technologies (UMR 6174) Authors: Vichard, Loic;Ces modélisations, sont associées au projet AsDeCoEUR (Analyses De Composants Energétiques en Usage Réel). Le projet souhaite s’appuyer sur une démarche menée autour d’un travail de thèse visant à comprendre le comportement dynamique, d’étudier le vieillissement et d’estimer l’état de santé des composants énergétiques, batterie et pile à combustible en usage réel. Cette démarche est basée sur l’analyse des données enregistrées sur ces composants dans le projet Mobypost (flotte de 10 véhicules Hydrogènes). La mise en œuvre des compétences et des outils d’analyse numériques développés notamment pour les batteries par le laboratoire Ampère et l’IFSTTAR vise à comprendre et à reproduire les phénomènes de dégradation des composants étudiés. Ces modèles permettent de contribuer à l’étude du vieillissement et d’estimer l’état de santé en usage réel des batteries et des piles à combustible. These models are associated with the project AsDeCoEUR (Analyses De Composants Energétiques en Usage Réel). The project is based on a thesis work aiming at understanding the dynamic behavior, to study the aging and to estimate the health status of the battery and fuel cell energy components in real use. This approach is based on the analysis of data recorded on these components in the Mobypost project (fleet of 10 hydrogen vehicles). The implementation of skills and numerical analysis tools developed in particular for batteries by the Ampère laboratory and IFSTTAR aims to understand and reproduce the degradation phenomena of the components studied. These models contribute to the study of ageing and estimate the state of health of batteries and fuel cells in real use. AdditionnalInformation: Model produced within the framework of Loic Vichard's thesis in electrical engineering (Contribution to the study of the aging of battery and fuel cell components in real use), under the supervision of Daniel Hissel (PU at the FEMTO-ST laboratory), Alexandre Ravey (MCF at UTBM) and Pascal Venet (PU at the Claude Bernard Lyon 1 University). AdditionnalInformation: Modèle produit dans le cadre de la thèse en génie électrique de Loic Vichard (Contribution à l'étude du vieillissement des composantes batteries et pile à combustible en usage réel), sous la direction de Daniel Hissel (PU au laboratoire FEMTO-ST), Alexandre Ravey (MCF à l'UTBM) et Pascal Venet (PU à l'université Claude Bernard Lyon 1). Données computationnelles ou de simulation: - Langage de programmation : Langage Matlab et Python - Plate-forme/OS : Microsoft Windows, Mac OS, Linux,... - Version : MATLAB R2018a - Statut de développement : Actif Simulation or computational data: - Programming language: Matlab language et Python language - Platform/OS: Microsoft Windows, Mac OS, Linux,... - Version: MATLAB R2018a - Development status: Active Project: Thèse de doctorat en génie électrique - Loic Vichard, Contrat doctoral - Projet AsDeCoEUR (Region Bourgogne Franche-Comté) Label: PHE (Plateforme Hydrogène-Energie) UpdatePeriodicity: no update Audience: Research
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For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Other literature type 1993 FrancePublisher:Gauthier-Villars Authors: Bachelet, G; Dauvin, Jc;The species composition and spatial distribution of macrofaunal assemblages in intertidal sands of Arcachon Bay, on the southwestern Atlantic coast of France, were investigated through a quantitative sampling of twenty stations representative of the various sandy habitats found in the bay, excluding the exposed beaches. Sampling was done on a single occasion, during the winter of 1988. A total of 150 macrobenthic species (> 1 mm) were collected. The abundance of macrofauna ranged from 89 to 52000 ind.m-2 (with a high dominance of the gastropod Hydrobia ulvae in some sites) and the biomass ranged from 1.3 to 42.5 g.m-2 dry weight. Thirteen additional species (belonging to temporary meiofauna and small macrofauna) were also sampled in the sieving fraction comprised between 1 mm and 100 mum. In this size fraction, the highest densities were those of H. ulvae juveniles in the inner bay and the small polychaete Parapionosyllis gestans in the outer bay. Mean abundance of total fauna > 100 mum (excluding permanent meiofauna) was about 35000 ind.m-2 in both sheltered and semi-exposed stations. A correspondence analysis of the distribution of species among stations followed by an automatic hierarchical classification identified six benthic assemblages, which were also characterized in terms of species dominance, constancy and fidelity. Two assemblages, corresponding to the boreal Macoma community, were distinguished in the sands at mid-tide level in the inner part of the bay: station-group A was characterized by Neomysis integer and Streblospio shrubsolii, together with a low number of species occurring in low-salinity estuarine waters; station-group B, with Cerastoderma edule, Arenicola marina, and Nereis diversicolor as characteristic species, was a sandy facies of the Macoma community dominated by C. edule. Three other assemblages, each with a high species richness, included several species of the boreal Lusitanian Tellina community: station-group C: a Eunice vittata-Tubificoides benedeni assemblage at lower tidal levels in the central part of the bay; station-group D: a Ruditapes decussatus-Goniada emerita assemblage at mid-tidal levels of the outer bay; station-group E: an Echinocardium cordatum-Magelona mirabilis-Aonides oxycephala assemblage at lower tidal levels of the outer bay. A sixth assemblage (station-group F) was an Ophelia bicornis-Bathyporeia sarsi assemblage in fine dune sands of the outer bay. A discriminant analysis including five environmental variables (tidal level, salinity, sediment median, fine particles and organic contents) revealed the first two variables to be the most important factors in the ordination of stations. With these five variables, only 65 % of the stations were correctly classified in the station-groups identified by correspondence analysis. Among the other possible factors governing the distribution of benthic assemblages, the importance of both exposure and circulation of water masses is stressed. Sheltered stations had a mean biomass of 22.8 g.m-2 dry weight and a mean species richness of 17.7 species; in semi-exposed stations, these values were 11.5 g.m-2 dry weight and 36.1 species.
ArchiMer - Instituti... arrow_drop_down ArchiMer - Institutional Archive of IfremerOther literature type . 1993Data sources: ArchiMer - Institutional Archive of Ifremeradd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
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visibility 97visibility views 97 download downloads 42 Powered bymore_vert ArchiMer - Instituti... arrow_drop_down ArchiMer - Institutional Archive of IfremerOther literature type . 1993Data sources: ArchiMer - Institutional Archive of Ifremeradd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
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For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article , Journal 2018Publisher:University of Liege Ayitre Akpakouma; Macomba Bétidé Adjayi; Bériname Badjaré; Dabitora Koumantiga; Georges Abbévi Abbey; Kouami Kokou; Nadédjo Bigou-lare;Description du sujet. Au Nord-Togo, particulièrement en milieu rural, les populations utilisent des biens d’espèces ligneuses et des services écosystémiques pour satisfaire des besoins multiples. Dans un environnement marqué par une déforestation accrue, se développe une pression anthropique croissante avec une incidence sur la vulnérabilité et la valorisation de ces ressources. Objectifs. Cette étude sur la diversité et les usages des ligneux permet d’apprécier la richesse floristique des terroirs et d’évaluer, à partir de quatre paramètres, la vulnérabilité des espèces répertoriées et connues des populations en zone de savane sèche. Méthode. L’approche méthodologique est basée sur des enquêtes ethnobotaniques et socio-économiques menées auprès de 14 groupes ethniques par interview individuel et au sein de « focus groups ». Les analyses ont porté sur des calculs de fréquences et d’indices de valeurs d’usage et d’importance des espèces répertoriées. Résultats. Au total, 149 espèces ligneuses utiles ont été identifiées et réparties en 45 familles. Neuf principaux usages reconnus sont relevés : alimentaire (69 espèces), médicinal (91 espèces), bois-énergie (57 espèces), fourrager (57 espèces), artisanal (37 espèces), soins hygiéniques (36 espèces), bois de service (40 espèces), rituel ou magico-spirituel (35 espèces) et cosmétique (26 espèces). Ces usages portent essentiellement sur les feuilles, racines, fruits, graines, fleurs, bois et écorces. Sur l’ensemble des espèces répertoriées, 42 (28 %) présentent un risque élevé de vulnérabilité, celle-ci étant évaluée sur base de quatre paramètres : la fréquence de citation, le nombre d’usages différents, l’organe collecté et le mode de collecte. Conclusions. L’étude montre que l’utilisation des espèces ligneuses varie selon le milieu géographique et la valeur d’importance des espèces explique la vulnérabilité de celles-ci dans la savane sèche.
Biotechnologie, Agro... arrow_drop_down Biotechnologie, Agronomie, Société et EnvironnementArticle . 2018 . Peer-reviewedData sources: Crossrefadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
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more_vert Biotechnologie, Agro... arrow_drop_down Biotechnologie, Agronomie, Société et EnvironnementArticle . 2018 . Peer-reviewedData sources: Crossrefadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
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Research data keyboard_double_arrow_right Dataset 2022Publisher:Franche-Comté Electronique Mécanique Thermique et Optique - Sciences et Technologies (UMR 6174) Authors: Boulon, Loïc;Cette modélisation présente la partie de contrôle d'une pile à combustible à membrane d'échange de protons (PEMFC). L'objectif du modèle de représenter la chaîne de contrôle de la tension de la PEMFC. Ce modèle est basé sur une représentation macroscopique énergétique (REM) de la pile à combustible, puis conduit à une structure dite de contrôle maximal (SCM). La SCM est une inversion étape par étape de la REM (structure de contrôle basée sur un modèle d'inversion). Le processus de conception de la commande est basé sur une définition explicite du problème. Par exemple, les entrées de réglage, les objectifs du système ou les contraintes sont mises en évidence pour organiser la commande. De plus, le SMC montre les endroits où les capteurs sont nécessaires et où les contrôleurs sont requis. Malheureusement, le SCM n'est qu'une structure de contrôle théorique. Par conséquent, une structure réaliste nécessite certaines simplifications, ce qui conduit à une structure de contrôle dite pratique. This modeling presents the control part of a proton exchange membrane fuel cell (PEMFC). The objective of the model is to represent the voltage control chain of the PEMFC. This model is based on an energetic macroscopic representation (EMR) of the fuel cell and then leads to a so-called maximum control structure (MCS). The SCM is a step-by-step inversion of the REM (control structure based on an inversion model). The control design process is based on an explicit problem definition. For example, control inputs, system objectives, or constraints are highlighted to organize the control. In addition, the MSC shows where sensors are needed and where controllers are required. Unfortunately, the SCM is only a theoretical control structure. Therefore, a realistic structure requires some simplifications, which leads to a so-called practical control structure. AdditionnalInformation: Modèle créé lors d'une thèse en génie électrique, par Loïc Boulon (ses recherches portent sur la modélisation et le contrôle des véhicules électriques hybrides, des sources d'énergie et d'énergie et de puissance, et des systèmes de piles à combustible). Il a travaillé en vue de l'obtention du diplôme de doctorat à l'Université de Franche-Comté, Belfort, France, où sa thèse de doctorat a été réalisée en collaboration avec le FEMTO-ST, Belfort, et les Laboratoires L2EP, Lille. Co-encadrement par Daniel Hissel (PU au laboratoire FEMTO-ST), Alain Bouscayrol (PU au laboratoire L2EP) et Marie-Célie Péra (PU au laboratoire FEMTO-ST) AdditionnalInformation: Model created during a thesis in electrical engineering, by Loïc Boulon (his research focuses on the modeling and control of hybrid electric vehicles, energy and power sources, and fuel cell systems). He worked towards his Ph.D. degree at the University of Franche-Comté, Belfort, France, where his dissertation was complet in collaboration with the FEMTO-ST, Belfort, and the L2EP Laboratories, Lille. Co-supervision by Daniel Hissel (PU at FEMTO-ST laboratory), Alain Bouscayrol (PU at L2EP laboratory) and Marie-Célie Péra (PU at FEMTO-ST laboratory) Données computationnelles ou de simulation: - Langage de programmation : Langage Matlab - Plate-forme/OS : Microsoft Windows, Mac OS, Linux,... - Version : MATLAB R2018a - Statut de développement : Actif Simulation or computational data: - Programming language: Matlab language - Platform/OS: Microsoft Windows, Mac OS, Linux,... - Version: MATLAB R2018a - Development status: Active Project: Thèse de doctorat en génie électrique - Loïc Boulon, Contrat doctoral (Region Bourgogne Franche-Comté) Label: PHE (Plateforme Hydrogène-Energie) Audience: Research
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For further information contact us at helpdesk@openaire.euResearch data keyboard_double_arrow_right Dataset 2021Publisher:Fuel Cell Lab (UAR 2200) Authors: Morando, Simon; Pahon, Élodie; Pahon, Élodie;Le projet PHM-PAC vise principalement le développement de méthodes intelligentes de détection, diagnostic et pronostic des défaillances de piles à combustibles. Ce projet doit permettre l'optimisation des performances des systèmes pile à combustible ainsi qu'une meilleure compréhension des phénomènes électrochimiques en affectant la durabilité. The PHM-PAC project is mainly aimed at developing intelligent methods for the detection, diagnosis and prognosis of fuel cell failures. This project should allow the optimization of the performance of fuel cell systems as well as a better understanding of the electrochemical phenomena affecting the durability. Données expérimentales: 2 800 heures de fonctionnement à charge constante sur une pile à combustible à membrane échangeuse de protons d'une puissance de 500W Experimental data: 2,800 hours of operation at constant load on a 500W proton exchange membrane fuel cell Project: PHM PAC, Région Bourgogne Franche-Comté (Region Bourgogne Franche-Comté) Audience: University: master, Research, University: licence Label: PHE (Plateforme Hydrogène-Energie) Label: Plateforme UBFC (Plateforme UBFC) UpdatePeriodicity: no update
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For further information contact us at helpdesk@openaire.eu2 citations 2 popularity Average influence Average impulse Average Powered by BIP!
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For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Other literature type 1982 FrancePublisher:ISTPM Heral, Maurice; Razet, Daniel; Deslous-paoli, Jean-marc; Berthome, Jean-paul; Garnier, J.;Les grandes caractéristiques hydrobiologiques du bassin de Marennes-Oléron sont définies par quatre campagnes saisonnières de 120 prélèvements chacune effectuée-, en 15 stations en demi-cycle de marée. Les salinités y fluctuent de 10 '/rr. et ce secteur peut donc être assimilé à un vaste estuaire contrôlé principalement par les apports fluviaux de la Charente. La turbidité reste élevée souvent supérieure à 100 mg.I"', les teneurs en oxygène dissous montrent un déficit en amont de la Charente et de la Seudre de 4 mg.L1 tandis que les sels nutritifs sont apportés par la Charente pour les nitrates, phosphates et silicates. Ces derniers suivent les courbes de dilution théorique excepté lors des poussées phytoplanctoniques et lors des crues hivernales. Lors de ces crues, les nitrates semblent soit apportés par la Gironde, soit dus à une minéralisation organique. Au même moment, les phosphates pourraient être absorbés sur les particules et être piégés dans les sédiments. Les biomasses phytoplanctoniques exprimées par les teneurs en chlorophylle a sont supésieures à 30 f^-g.1 ' en amont des estuaires au printemps avec des teneurs en phéopigmenls pouvants dépasser 200 IUJ.1 . par contre, dans le bassin, les teneurs ne dépassent guère 10 fig.l ''. Les concentrations en ATP montrent que peu de phytoplancton est physiologiquement actif en particulier dans les estuaires, tandis que les dosages de protéines permettent de quantifier la part des apports allochtone - par rapport à la production autochtone des estuaires. Line analyse factorielle des correspondances définit le schéma général hydrobiologique du bassin estuarien en précisant que 'e rôle de la Charente ne se limite pas à l'apport en sels minéraux azotés et phosphatés, mais aussi à l'apport d'une biomasse phytoplanctonique d'eau douce en voie de dégénérescence. Les auteurs proposent qu'une nouvelle stratégie d'échantillonnage, mieux adaptée aux objectifs recherchés, soit suivie ultérieurement en assurant des prélèvements en cycle de marée mais avec une périodicité la plus élevée possible. Four seasonal compaigns providing a sampling of 15 stations each followed during half a tide cycle, i.e. 120 water samples permit the definition of the main hydrobiological features of Marennes-Oleron Bay: salinity and turbidity, phytoplanktonic biomasses, ATP concentrations. The authors suggest that a new way of adapted sampling to their objectives, will work out in the future by sampling during tidal cycles but as frequently as possible.
ArchiMer - Instituti... arrow_drop_down ArchiMer - Institutional Archive of IfremerOther literature type . 1982Data sources: ArchiMer - Institutional Archive of Ifremeradd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
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visibility 59visibility views 59 download downloads 28 Powered bymore_vert ArchiMer - Instituti... arrow_drop_down ArchiMer - Institutional Archive of IfremerOther literature type . 1982Data sources: ArchiMer - Institutional Archive of Ifremeradd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
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For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Other literature type , External research report , Report , Preprint 2013 FrancePublisher:Unknown Funded by:UKRI | End to End logistic suppo...UKRI| End to End logistic support tools for effective aerial drone delivery against COVID-19Authors: Gohin, Alexandre; Gohin, Alexandre;[Paper in French] The European public policy in favor of the biodiesel consumption is highly debated. Available estimates of the induced land use changes conclude that this policy is inefficient to reduce emissions of GreenHouse Gas. We show that the crop yield evolutions in these estimates are significantly lower than the observed and expected evolutions. This difference is directly related to biased calibration choice of behavioral parameters. We show using the GTAP-BIO framework that a consistent calibration of these parameters leads to a strong reduction (by around 80% in the long run) of the land use changes and induced emissions.
Hyper Article en Lig... arrow_drop_down INRIA a CCSD electronic archive serverReport . 2013Data sources: INRIA a CCSD electronic archive serveradd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
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more_vert Hyper Article en Lig... arrow_drop_down INRIA a CCSD electronic archive serverReport . 2013Data sources: INRIA a CCSD electronic archive serveradd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
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For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Other literature type 2009 FrancePublisher:Ecole Centrale de Nantes Authors: Saulnier, Jean Baptiste;This work focuses on the refinement of sea-states spectral characterisation in the frame of the development of wave energy converters (WECs). Until now, this characterisation has been limited to the consideration of basic global parameters such as the significant wave height and mean wave period. The present work namely underlines - thanks to simplified numerical models - that such a description is not sufficient to account for the performance of WECs, for they still exhibit a large variability in terms of mean production while wave energy and period are fixed. It is therefore needed to refine this description by introducing new wave characteristics, such as the wave groupiness, which is itself related to the sea-state's spectral bandwidth. The classical - spectral - approaches, allowing a statistical analysis of wave groups along with other works in the literature, permit to draw a set of relevant spectral parameters. The sensitivity of simplified offshore WEC models (linear in the frequency domain) to these parameters is then observed. The question of deterministic mean power estimation - namely in the case of non-linear models - is also raised, for it is also related somehow to the bandwidth of the wave field. A sea-state is actually made of a superimposition of various wave systems (as swells and wind-sea). It is then possible to refine even more its description, namely through the multi-system approach. The latter enables indeed to track in time and space the wave systems independently of each other. An algorithm for the automatic spatiotemporal analysis is proposed and illustrated to this end. Lastly, the influence of such description refinements (wave groupiness and multi-system approach) is observed at several locations (Portugal, North Sea, California) by considering various WEC models (linear axi-symmetric heaving devices, 3D SEAREV with non-linear hydrodynamics): in all cases, it is shown that both extended descriptions allow for a better characterisation of the mean WEC performance at both short and long term. Ces travaux portent sur la caractérisation spectrale des états de mer dans le cadre du développement de systèmes récupérateurs de l'énergie des vagues (SREVs). Jusqu'alors, cette caractérisation s'est limitée à des paramètres globaux basiques tels que la hauteur significative et la période moyenne des vagues. Les présents travaux soulignent notamment, à l'aide de modèles simplifiés, que cette description est insuffisante car un SREV montre encore une grande variabilité en termes de production moyenne, ces deux paramètres étant fixés par ailleurs. On s'intéresse donc à raffiner cette description en considérant des caractéristiques de vagues nouvelles, comme le groupement de vagues, lui-même lié à la largeur de bande de l'état de mer. Les approches classiques - spectrales - sur l'étude descriptive des groupes de vagues et la littérature permettent de dégager un certain nombre de paramètres spectraux. On observe ensuite la sensibilité de modèles de SREVs offshore simplifiés (modèles fréquentiels linéaires) à ces paramètres de largeur globale. La question de l'estimation déterministe de performance moyenne (dans le cas de convertisseurs non-linéaires) est également abordée, étant elle-même liée à cette caractéristique. Un état de mer étant constitué de plusieurs systèmes de vagues (houles, mer de vent), il est encore possible de raffiner sa description grâce à une approche multisystème. Celle-ci permet en outre de suivre ces systèmes indépendamment dans le temps et l'espace. Un algorithme d'analyse spatio-temporelle est proposé et illustré à cet égard. Enfin, l'influence de ces raffinements est observée en différents sites (Portugal, Mer du Nord, Californie) sur des cas de SREVs divers (systèmes axi-symétriques linéaires, SEAREV 3D d'hydrodynamique non-linéaire), et montre que dans tous les cas, le raffinement apporté permet de mieux caractériser la production à court et long terme de ces dispositifs.
ArchiMer - Instituti... arrow_drop_down ArchiMer - Institutional Archive of IfremerOther literature type . 2009Data sources: ArchiMer - Institutional Archive of Ifremeradd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
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visibility 24visibility views 24 download downloads 15 Powered bymore_vert ArchiMer - Instituti... arrow_drop_down ArchiMer - Institutional Archive of IfremerOther literature type . 2009Data sources: ArchiMer - Institutional Archive of Ifremeradd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
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For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Other literature type , Preprint 2014Publisher:Unknown Tamini, Lota D.; Clerkson, Frédérick; Doyon, Maurice; Debailleul, Guy; Tamini, Lota D.; Clerkson, Frédérick; Doyon, Maurice; Debailleul, Guy;Climate change will affect agricultural production conditions, which will translate in impacts on yield and cost of production for Quebec farmers. This would likely affect the relative competitive position of Quebec in North America. Using the Delphi technique and partial budgets, climate change scenarios for the 2050 period were elaborated and their impact on relative competitiveness assessed for Quebec and its competitors in North America. Results indicate that Quebec competitive position would improve due to more favorable conditions for corn and apple production and due to worsen conditions for the competitors in maple syrup production.
Research Papers in E... arrow_drop_down add ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
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more_vert Research Papers in E... arrow_drop_down add ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
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For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Other literature type 1984 FrancePublisher:Actes de colloques. Ifremer. Brest [ACTES COLLOQ. IFREMER.]. 1984 Funded by:NSERCNSERCAuthors: Maestrini, S; Rochet, M; Legendre, L; Demers, S;Nutrient analyses were done in melted ice, frazil and sea water of the upper part of the water column, where as major constitutive elements of micro-algae were analysed. Measurements of nutrient uptake were carried out with frazil algae incubated at -1.5 degree C in a field incubator. Differential-enrichment bioassays and mean N/P ratio (5.9) demonstrated that actual growth of the cultures was nutrient-limited. Nitrogen governed the algal yield when illumination and grazing allowed the microalgae to grow. It concluded that the epontic dynamics is not only controlled from above, by the seasonal (climatic) changes in light intensity as generally assumed, but also from below, by the short-term (hydrodynamic) events of vertical mixing that replenish the ice-water interface in nutrients.
ArchiMer - Instituti... arrow_drop_down ArchiMer - Institutional Archive of IfremerOther literature type . 1984Data sources: ArchiMer - Institutional Archive of Ifremeradd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
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visibility 3visibility views 3 download downloads 1 Powered bymore_vert ArchiMer - Instituti... arrow_drop_down ArchiMer - Institutional Archive of IfremerOther literature type . 1984Data sources: ArchiMer - Institutional Archive of Ifremeradd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
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For further information contact us at helpdesk@openaire.euResearch data keyboard_double_arrow_right Dataset 2022Publisher:Franche-Comté Electronique Mécanique Thermique et Optique - Sciences et Technologies (UMR 6174) Authors: Vichard, Loic;Ces modélisations, sont associées au projet AsDeCoEUR (Analyses De Composants Energétiques en Usage Réel). Le projet souhaite s’appuyer sur une démarche menée autour d’un travail de thèse visant à comprendre le comportement dynamique, d’étudier le vieillissement et d’estimer l’état de santé des composants énergétiques, batterie et pile à combustible en usage réel. Cette démarche est basée sur l’analyse des données enregistrées sur ces composants dans le projet Mobypost (flotte de 10 véhicules Hydrogènes). La mise en œuvre des compétences et des outils d’analyse numériques développés notamment pour les batteries par le laboratoire Ampère et l’IFSTTAR vise à comprendre et à reproduire les phénomènes de dégradation des composants étudiés. Ces modèles permettent de contribuer à l’étude du vieillissement et d’estimer l’état de santé en usage réel des batteries et des piles à combustible. These models are associated with the project AsDeCoEUR (Analyses De Composants Energétiques en Usage Réel). The project is based on a thesis work aiming at understanding the dynamic behavior, to study the aging and to estimate the health status of the battery and fuel cell energy components in real use. This approach is based on the analysis of data recorded on these components in the Mobypost project (fleet of 10 hydrogen vehicles). The implementation of skills and numerical analysis tools developed in particular for batteries by the Ampère laboratory and IFSTTAR aims to understand and reproduce the degradation phenomena of the components studied. These models contribute to the study of ageing and estimate the state of health of batteries and fuel cells in real use. AdditionnalInformation: Model produced within the framework of Loic Vichard's thesis in electrical engineering (Contribution to the study of the aging of battery and fuel cell components in real use), under the supervision of Daniel Hissel (PU at the FEMTO-ST laboratory), Alexandre Ravey (MCF at UTBM) and Pascal Venet (PU at the Claude Bernard Lyon 1 University). AdditionnalInformation: Modèle produit dans le cadre de la thèse en génie électrique de Loic Vichard (Contribution à l'étude du vieillissement des composantes batteries et pile à combustible en usage réel), sous la direction de Daniel Hissel (PU au laboratoire FEMTO-ST), Alexandre Ravey (MCF à l'UTBM) et Pascal Venet (PU à l'université Claude Bernard Lyon 1). Données computationnelles ou de simulation: - Langage de programmation : Langage Matlab et Python - Plate-forme/OS : Microsoft Windows, Mac OS, Linux,... - Version : MATLAB R2018a - Statut de développement : Actif Simulation or computational data: - Programming language: Matlab language et Python language - Platform/OS: Microsoft Windows, Mac OS, Linux,... - Version: MATLAB R2018a - Development status: Active Project: Thèse de doctorat en génie électrique - Loic Vichard, Contrat doctoral - Projet AsDeCoEUR (Region Bourgogne Franche-Comté) Label: PHE (Plateforme Hydrogène-Energie) UpdatePeriodicity: no update Audience: Research
add ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
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For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Other literature type 1993 FrancePublisher:Gauthier-Villars Authors: Bachelet, G; Dauvin, Jc;The species composition and spatial distribution of macrofaunal assemblages in intertidal sands of Arcachon Bay, on the southwestern Atlantic coast of France, were investigated through a quantitative sampling of twenty stations representative of the various sandy habitats found in the bay, excluding the exposed beaches. Sampling was done on a single occasion, during the winter of 1988. A total of 150 macrobenthic species (> 1 mm) were collected. The abundance of macrofauna ranged from 89 to 52000 ind.m-2 (with a high dominance of the gastropod Hydrobia ulvae in some sites) and the biomass ranged from 1.3 to 42.5 g.m-2 dry weight. Thirteen additional species (belonging to temporary meiofauna and small macrofauna) were also sampled in the sieving fraction comprised between 1 mm and 100 mum. In this size fraction, the highest densities were those of H. ulvae juveniles in the inner bay and the small polychaete Parapionosyllis gestans in the outer bay. Mean abundance of total fauna > 100 mum (excluding permanent meiofauna) was about 35000 ind.m-2 in both sheltered and semi-exposed stations. A correspondence analysis of the distribution of species among stations followed by an automatic hierarchical classification identified six benthic assemblages, which were also characterized in terms of species dominance, constancy and fidelity. Two assemblages, corresponding to the boreal Macoma community, were distinguished in the sands at mid-tide level in the inner part of the bay: station-group A was characterized by Neomysis integer and Streblospio shrubsolii, together with a low number of species occurring in low-salinity estuarine waters; station-group B, with Cerastoderma edule, Arenicola marina, and Nereis diversicolor as characteristic species, was a sandy facies of the Macoma community dominated by C. edule. Three other assemblages, each with a high species richness, included several species of the boreal Lusitanian Tellina community: station-group C: a Eunice vittata-Tubificoides benedeni assemblage at lower tidal levels in the central part of the bay; station-group D: a Ruditapes decussatus-Goniada emerita assemblage at mid-tidal levels of the outer bay; station-group E: an Echinocardium cordatum-Magelona mirabilis-Aonides oxycephala assemblage at lower tidal levels of the outer bay. A sixth assemblage (station-group F) was an Ophelia bicornis-Bathyporeia sarsi assemblage in fine dune sands of the outer bay. A discriminant analysis including five environmental variables (tidal level, salinity, sediment median, fine particles and organic contents) revealed the first two variables to be the most important factors in the ordination of stations. With these five variables, only 65 % of the stations were correctly classified in the station-groups identified by correspondence analysis. Among the other possible factors governing the distribution of benthic assemblages, the importance of both exposure and circulation of water masses is stressed. Sheltered stations had a mean biomass of 22.8 g.m-2 dry weight and a mean species richness of 17.7 species; in semi-exposed stations, these values were 11.5 g.m-2 dry weight and 36.1 species.
ArchiMer - Instituti... arrow_drop_down ArchiMer - Institutional Archive of IfremerOther literature type . 1993Data sources: ArchiMer - Institutional Archive of Ifremeradd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
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visibility 97visibility views 97 download downloads 42 Powered bymore_vert ArchiMer - Instituti... arrow_drop_down ArchiMer - Institutional Archive of IfremerOther literature type . 1993Data sources: ArchiMer - Institutional Archive of Ifremeradd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
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For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article , Journal 2018Publisher:University of Liege Ayitre Akpakouma; Macomba Bétidé Adjayi; Bériname Badjaré; Dabitora Koumantiga; Georges Abbévi Abbey; Kouami Kokou; Nadédjo Bigou-lare;Description du sujet. Au Nord-Togo, particulièrement en milieu rural, les populations utilisent des biens d’espèces ligneuses et des services écosystémiques pour satisfaire des besoins multiples. Dans un environnement marqué par une déforestation accrue, se développe une pression anthropique croissante avec une incidence sur la vulnérabilité et la valorisation de ces ressources. Objectifs. Cette étude sur la diversité et les usages des ligneux permet d’apprécier la richesse floristique des terroirs et d’évaluer, à partir de quatre paramètres, la vulnérabilité des espèces répertoriées et connues des populations en zone de savane sèche. Méthode. L’approche méthodologique est basée sur des enquêtes ethnobotaniques et socio-économiques menées auprès de 14 groupes ethniques par interview individuel et au sein de « focus groups ». Les analyses ont porté sur des calculs de fréquences et d’indices de valeurs d’usage et d’importance des espèces répertoriées. Résultats. Au total, 149 espèces ligneuses utiles ont été identifiées et réparties en 45 familles. Neuf principaux usages reconnus sont relevés : alimentaire (69 espèces), médicinal (91 espèces), bois-énergie (57 espèces), fourrager (57 espèces), artisanal (37 espèces), soins hygiéniques (36 espèces), bois de service (40 espèces), rituel ou magico-spirituel (35 espèces) et cosmétique (26 espèces). Ces usages portent essentiellement sur les feuilles, racines, fruits, graines, fleurs, bois et écorces. Sur l’ensemble des espèces répertoriées, 42 (28 %) présentent un risque élevé de vulnérabilité, celle-ci étant évaluée sur base de quatre paramètres : la fréquence de citation, le nombre d’usages différents, l’organe collecté et le mode de collecte. Conclusions. L’étude montre que l’utilisation des espèces ligneuses varie selon le milieu géographique et la valeur d’importance des espèces explique la vulnérabilité de celles-ci dans la savane sèche.
Biotechnologie, Agro... arrow_drop_down Biotechnologie, Agronomie, Société et EnvironnementArticle . 2018 . Peer-reviewedData sources: Crossrefadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
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more_vert Biotechnologie, Agro... arrow_drop_down Biotechnologie, Agronomie, Société et EnvironnementArticle . 2018 . Peer-reviewedData sources: Crossrefadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
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