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description Publicationkeyboard_double_arrow_right Doctoral thesis , Other literature type 2017 France FrenchPublisher:Université Paris-Est Authors: Herrera, Amaury;Herrera, Amaury;Dans le cadre de l’utilisation de plus en plus courante des BFUP dans des structures techniquement ou architecturalement complexes et de la recherche d’optimisation de la quantité de matériau mis en œuvre, cette thèse s’intéresse au fonctionnement des jonctions en BFUP. Son objectif principal est de mettre en évidence les phénomènes physiques qui interviennent dans la jonction et de mieux les retranscrire dans les méthodes de calcul afin de mieux en maîtriser la sécurité et d’optimiser la matière mise en oeuvre.Le travail de thèse s’articule en quatre étapes :-Une étude bibliographique a permis d’établir les bases de connaissances permettant de dimensionner les campagnes expérimentales et de proposer une structure de modélisation des jonctions âme-membrure.-Le développement d’un modèle analytique avancé permettant de prédire le comportement d’une poutre en Té soumise à une sollicitation combinée de flexion longitudinale (et donc de cisaillement longitudinal dans la table) et de flexion transversale.-L’étude expérimentale, à l’échelle du matériau, du comportement des BFUP sous sollicitation de cisaillement pur. Cette étude permet d’enrichir les connaissances sur le comportement des BFUP (données encore indisponibles dans la carte d’identité des différents matériaux) et constitue également une donnée d’entrée pour la compréhension quantitative des phénomènes qui interviennent dans la jonction, à l’échelle de la structure, lorsqu’elle est sollicitée en cisaillement longitudinal.-Enfin, l’essai à rupture de 6 poutres en Té à l’échelle 1 a permis d’étudier le comportement expérimental des jonctions soumises à des sollicitations de cisaillement longitudinal. Les résultats expérimentaux de cette étude ont été comparés aux différentes prédictions analytiques possibles, y compris le modèle proposé.Ces travaux de thèse ont permis d’apporter de nouveaux outils de dimensionnement (notamment dans le cadre de l’étude de la résistance des jonctions en BFUP sous sollicitation de cisaillement pur). Ils mériteraient d’être complétés par des essais de poutres soumis à une sollicitation concomitante de flexion longitudinale et de flexion transversale, pour mieux conforter les méhodes d’analyse proposées Ultra-high performance fiber-reinforced concrete (UHPFRC) are increasingly used for technically or architecturally complex structures and research is going on to optimize design and save implemented material quantities. In this context, this thesis focuses on the mechanical behavior of junctions in UHPFRC structures. The main goal is to highlight physical phenomena occurring in the junctions in order to optimally transpose them into calculation methods. In this way, both safety and cost-efficience should be better controlled.This thesis is divided in four steps :-A literature review enabled to establish the background knowledge allowing to design the experimental campaigns and to suggest a modeling for web-flange junctions.-An advanced analytical model was developed in order to predict the behavior of a T-beam subjected to combined longitudinal bending (and therefore longitudinal shear in the table) and transverse bending.-The expérimental study, at the material scale, of UHPFRC behavior under pure shear stress, allowed enriching the knowledge in this field (data still unavailable in the identity card of current UHPFRC mixes). It also constituted an input for the quantitative understanding of the phenomena occuring in the junction, at the structure scale, when it is loaded in longitudinal shear.-Finally, the test of 6 full scale T-beams up to failure made it possible to study the experimental behavior of the junctions subjected to longitudinal shear stresses. The experimental results were compared with the various analytical predictions, including the proposed model.A new approch has thus been proposed to design junctions under longitudinal shear. It should be completed with experiments on T-beams under combined longitudinal and transverse bending to further validate the proposed analysis methods
Archive institutionn... arrow_drop_down Archive institutionnelle IfsttarDoctoral thesis . 2017Data sources: Archive institutionnelle IfsttarMémoires en Sciences de l'Information et de la CommunicationDoctoral thesis . 2017All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=od_______212::15c1349c64e73c4cec3dd2e353a65c8c&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eu0 citations 0 popularity Average influence Average impulse Average Powered by BIP!more_vert Archive institutionn... arrow_drop_down Archive institutionnelle IfsttarDoctoral thesis . 2017Data sources: Archive institutionnelle IfsttarMémoires en Sciences de l'Information et de la CommunicationDoctoral thesis . 2017All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=od_______212::15c1349c64e73c4cec3dd2e353a65c8c&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article , Other literature type 2011 Germany, Belgium, France, France, FrancePublisher:American Geophysical Union (AGU) Helmuth Thomas; Elizabeth H. Shadwick; Frank Dehairs; Bruno Lansard; Alfonso Mucci; Jacques Navez; Yves Gratton; Friederike Prowe; Melissa Chierici; Agneta Fransson; Tim Papakyriakou; Erika Sternberg; Lisa A. Miller; Jean-Éric Tremblay; Christophe Monnin;The seasonal and spatial variability of dissolved Barium (Ba) in the Amundsen Gulf, southeastern Beaufort Sea, was monitored over a full year from September 2007 to September 2008. Dissolved Ba displays a nutrient-type behavior: the maximum water column concentration is located below the surface layer. The highest Ba concentrations are typically observed at river mouths, the lowest concentrations are found in water masses of Atlantic origin. Barium concentrations decrease eastward through the Canadian Arctic Archipelago. Barite (BaSO4) saturation is reached at the maximum dissolved Ba concentrations in the subsurface layer, whereas the rest of the water column is undersaturated. A three end-member mixing model comprising freshwater from sea-ice melt and rivers, as well as upper halocline water, is used to establish their relative contributions to the Ba concentrations in the upper water column of the Amundsen Gulf. Based on water column and riverine Ba contributions, we assess the depletion of dissolved Ba by formation and sinking of biologically bound Ba (bio-Ba), from which we derive an estimate of the carbon export production. In the upper 50 m of the water column of the Amundsen Gulf, riverine Ba accounts for up to 15% of the available dissolved Ba inventory, of which up to 20% is depleted by bio-Ba formation and export. Since riverine inputs and Ba export occur concurrently, the seasonal variability of dissolved Ba in the upper water column is moderate. Assuming a fixed organic carbon to bio-Ba flux ratio, carbon export out of the surface layer is estimated at 1.8 ± 0.45 mol C m-2 yr-1. Finally, we propose a climatological carbon budget for the Amundsen Gulf based on recent literature data and our findings, the latter bridging the surface and subsurface water carbon cycles.
OceanRep arrow_drop_down Vrije Universiteit Brussel Research PortalOther literature type . 2011Data sources: Vrije Universiteit Brussel Research PortalJournal of Geophysical Research AtmospheresArticle . 2011 . Peer-reviewedLicense: Wiley TDMData sources: Crossrefadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.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 Routesbronze 33 citations 33 popularity Top 10% influence Average impulse Top 10% Powered by BIP!more_vert OceanRep arrow_drop_down Vrije Universiteit Brussel Research PortalOther literature type . 2011Data sources: Vrije Universiteit Brussel Research PortalJournal of Geophysical Research AtmospheresArticle . 2011 . Peer-reviewedLicense: Wiley TDMData sources: Crossrefadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1029/2011jc007120&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article , Other literature type 2018 Germany, France, France, FrancePublisher:Oxford University Press (OUP) Funded by:EC | MARmaEDEC| MARmaEDFrelat, Romain; Orio, Alessandro; Casini, Michele; Lehmann, Andreas; Mérigot, Bastien; Otto, Saskia A; Sguotti, Camilla; Möllmann, Christian;BONUS Symposium on Science Delivery for Sustainable Use of the Baltic Sea Living Resources, Tallinn, ESTONIA, OCT, 2017; International audience; Fisheries and marine ecosystem-based management requires a holistic understanding of the dynamics of fish communities and their responses to changes in environmental conditions. Environmental conditions can simultaneously shape the spatial distribution and the temporal dynamics of a population, which together can trigger changes in the functional structure of communities. Here, we developed a comprehensive framework based on complementary multivariate statistical methodologies to simultaneously investigate the effects of environmental conditions on the spatial, temporal and functional dynamics of species assemblages. The framework is tested using survey data collected during more than 4000 fisheries hauls over the Baltic Sea between 2001 and 2016. The approach revealed the Baltic fish community to be structured into three sub-assemblages along a strong and temporally stable salinity gradient decreasing from West to the East. Additionally, we highlight a mismatch between species and functional richness associated with a lower functional redundancy in the Baltic Proper compared with other sub-areas, suggesting an ecosystem more susceptible to external pressures. Based on a large dataset of community data analysed in an innovative and comprehensive way, we could disentangle the effects of environmental changes on the structure of biotic communities—key information for the management and conservation of ecosystems.
ICES Journal of Mari... arrow_drop_down ICES Journal of Marine ScienceOther literature type . Article . 2018 . Peer-reviewedLicense: CC BYOceanRepArticle . 2018 . Peer-reviewedFull-Text: http://oceanrep.geomar.de/45244/1/fsy027.pdfData sources: OceanRepArchiMer - Institutional Archive of IfremerOther literature type . 2018Data 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.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1093/icesjms/fsy027&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.euAccess Routeshybrid 8 citations 8 popularity Top 10% influence Average impulse Top 10% Powered by BIP!visibility 4visibility views 4 download downloads 2 Powered bymore_vert ICES Journal of Mari... arrow_drop_down ICES Journal of Marine ScienceOther literature type . Article . 2018 . Peer-reviewedLicense: CC BYOceanRepArticle . 2018 . Peer-reviewedFull-Text: http://oceanrep.geomar.de/45244/1/fsy027.pdfData sources: OceanRepArchiMer - Institutional Archive of IfremerOther literature type . 2018Data 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.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1093/icesjms/fsy027&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article 2020 Germany, FrancePublisher:Frontiers Media SA Funded by:NSF | Collaborative Research: E..., EC | GrIS-MeltNSF| Collaborative Research: Eurasian and Makarov basins observational network targets changes in the Arctic Ocean ,EC| GrIS-MeltAchim Randelhoff; Achim Randelhoff; Johnna Holding; Johnna Holding; Markus Janout; Mikael Kristian Sejr; Mikael Kristian Sejr; Marcel Babin; Marcel Babin; Jean-Éric Tremblay; Jean-Éric Tremblay; Matthew B. Alkire;Arctic Ocean primary productivity is limited by light and inorganic nutrients. With sea ice cover declining in recent decades, nitrate limitation has been speculated to become more prominent. Although much has been learned about nitrate supply from general patterns of ocean circulation and water column stability, a quantitative analysis requires dedicated turbulence measurements that have only started to accumulate in the last dozen years. Here we present new observations of the turbulent vertical nitrate flux in the Laptev Sea, Baffin Bay, and Young Sound (North-East Greenland), supplementing a compilation of 13 published estimates throughout the Arctic Ocean. Combining all flux estimates with a Pan-Arctic database of in situ measurements of nitrate concentration and density, we found the annual nitrate inventory to be largely determined by the strength of stratification and by bathymetry. Nitrate fluxes explained the observed regional patterns and magnitudes of both new primary production and particle export on annual scales. We argue that with few regional exceptions, vertical turbulent nitrate fluxes can be a reliable proxy of Arctic primary production accessible through autonomous and large-scale measurements. They may also provide a framework to assess nutrient limitation scenarios based on clear energetic and mass budget constraints resulting from turbulent mixing and freshwater flows.
OceanRep; Frontiers ... arrow_drop_down Electronic Publication Information CenterArticle . 2020Data sources: Electronic Publication Information CenterMémoires en Sciences de l'Information et de la CommunicationArticle . 2020Full-Text: https://hal.science/hal-03094859/documentadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.3389/fmars.2020.00150&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.euAccess Routesgold 78 citations 78 popularity Top 1% influence Top 10% impulse Top 1% Powered by BIP!more_vert OceanRep; Frontiers ... arrow_drop_down Electronic Publication Information CenterArticle . 2020Data sources: Electronic Publication Information CenterMémoires en Sciences de l'Information et de la CommunicationArticle . 2020Full-Text: https://hal.science/hal-03094859/documentadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.3389/fmars.2020.00150&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Doctoral thesis 2017 FranceAuthors: Charroyer, Lucien;Charroyer, Lucien;Ces travaux s’inscrivent dans le cadre des recherches destinées à réduire ou à éliminer le bruit de crissement émis par les véhicules ferroviaires en courbe ou au freinage. Ces bruits peuvent en effet atteindre des niveaux sonores très élevés, jusqu’à 105 dB(A) à proximité des rames en cas de freinage par exemple, et constituent une gêne importante pour les usagers et les riverains. Afin d’apporter des solutions de réduction de ce bruit de crissement, on se concentre sur la modélisation des vibrations auto-entretenues de structures avec contact frottant ainsi que sur la compréhension des mécanismes à l’origine du crissement résultant, en particulier dans le cas d’un frein à disque ferroviaire. On fait l’hypothèse que les vibrations ont pour origine un couplage de modes de la structure dans les directions tangentielles et normale à l’interface en contact frottant. Ce couplage entraîne une instabilité de l’équilibre quasi-statique glissant du système et l’apparition de vibrations auto-entretenues. On cherche à déterminer ces vibrations par le calcul ce qui s’effectue en deux étapes. Dans un premier temps, l’analyse de stabilité de l’équilibre quasi-statique du système permet de déterminer l’occurrence des vibrations. Dans cette thèse, deux hypothèses de modélisation du frottement – plan ou rectiligne – sont comparées dans le cas d’un modèle académique minimal. Dans le cas non-amorti, on montre que l’hypothèse simplificatrice du frottement rectiligne tend à stabiliser le système. Dans le cas amorti, on constate que les résultats établis dans la littérature pour un frottement rectiligne, en particulier le paradoxe de déstabilisation, ne sont pas facilement généralisables au cas du frottement plan bien que des similitudes existent. Dans un deuxième temps, une analyse non-linéaire est nécessaire pour déterminer les amplitudes et le contenu fréquentiel précis des vibrations auto-entretenues. Cette étape est généralement effectuée à l’aide d’une intégration temporelle numérique à partir de conditions initiales données, proches de l’équilibre glissant. En examinant l’évolution temporelle des vibrations obtenues à l’aide de cette technique, on peut distinguer d’une part le régime transitoire au cours duquel les non-linéarités apparaissent et stabilisent progressivement la solution instable, et d’autre part le régime stationnaire (ou régime de fonctionnement) où les amplitudes vibratoires sont stabilisées. Dans le cas du modèle académique, une analyse rigoureuse des échanges énergétiques au cours de l’évolution temporelle permet de mettre en évidence l’origine de la stabilisation des vibrations, en particulier la baisse du taux de puissance injectée au contact résultant de l’accumulation des événements fortement non-linéaires : décollements, adhérences ou chocs. L’intégration temporelle directe n’est toutefois pas adaptée à des modèles numériques comportant de nombreux degrés de liberté et pour lesquels la détermination du régime stationnaire est généralement suffisante pour proposer des solutions de réduction. Le surcoût de calcul engendré par le régime transitoire est en effet très limitant. C’est pourquoi, une méthode est proposée pour approximer directement le régime stationnaire dans le cas d’un système mono-instable. Cette méthode combine une technique de tir à une initialisation basée sur les observations énergétiques ci-dessus. Elle est d’abord validée sur le modèle minimal puis adaptée au modèle éléments finis de frein ferroviaire moyennant une approximation originale de la technique de tir : la réduction de l’espace des phases des conditions initiales. Les approximations des régimes stationnaires sont comparées avec ceux obtenus par l’intégration temporelle directe. Les avantages et les limitations de la méthode sont discutés. This work is part of research intended to mitigate or eliminate the squeal noise produced by railway vehicles in curves or during braking. For instance, brake noise can reach very high sound levels up to 105 dB(A) close to the trains and constitutes an important nuisance for passengers and residents in the station. In order to provide some mitigation measures, the study focuses on the modelling of self-sustained structural vibrations in presence of frictional contact and the understanding of the squeal generation mechanism, especially for of a railway disc brake. It is assumed that vibration is due to structural mode coupling in the normal and tangential directions at the frictional interface. This coupling leads to instability of the sliding quasistatic equilibrium of the system and the occurrence of self-sustained vibrations. Two steps are necessary to calculate these vibrations. Firstly, the occurrence of the vibrations is determined through the stability analysis of the quasi-static equilibrium. In this thesis, two modelling assumptions for the friction law – planar or rectilinear – are compared in the case of an academic model. Without damping, the simplified rectilinear friction law tends to stabilize the system. With damping, the results established in the literature in case of rectilinear friction, especially the destabilization paradox, cannot be applied generally in case of planar friction even if similarities may be observed. Secondly, a nonlinear analysis is necessary and performed to calculate the amplitudes and the detailed spectral content of the self-sustained vibrations. This step is generally performed by using numerical time integration from given initial conditions, close to the equilibrium. Taking a look at the vibrations time histories obtained by this technique, two different states may be distinguished. In the transient state, nonlinear forces appear and gradually stabilize the unstable solution whereas in the steady (stationary) state, vibrations are stabilized. In the case of the academic model, the cause of the stabilization is highlighted thanks to a rigorous analysis of energy exchanges, especially the decrease of the power rate injected via the contact interface resulting from the accumulation of strongly nonlinear events like loss of contact, stick or impacts. However, direct time integration is not very appropriate in the case of large numerical models with many degrees of freedom. Indeed, the additional computational cost due to the transient state is very high although the determination of the steady state is generally sufficient from a practical point of view. Consequently, a method is proposed in order to directly approximate the steady state in case of mono-instability. This method combines a shooting technique with an initialization based on the above energy considerations. It is first validated on the minimal model and then transposed to the finite element model of a railway disc brake through an original approximation of the shooting technique : the reduction of the initial conditions phase space. The estimations of the steady states are compared with those obtained by direct time integration. The advantages and the limitations of the method are discussed.
Hyper Article en Lig... arrow_drop_down Hyper Article en Ligne; Mémoires en Sciences de l'Information et de la CommunicationOther literature type . Doctoral thesis . 2017Archive institutionnelle IfsttarDoctoral thesis . 2017Data sources: Archive institutionnelle IfsttarAll Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=od_______212::a39201b7ccf11f151245a2a8c7aacf1e&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eu0 citations 0 popularity Average influence Average impulse Average Powered by BIP!more_vert Hyper Article en Lig... arrow_drop_down Hyper Article en Ligne; Mémoires en Sciences de l'Information et de la CommunicationOther literature type . Doctoral thesis . 2017Archive institutionnelle IfsttarDoctoral thesis . 2017Data sources: Archive institutionnelle IfsttarAll Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=od_______212::a39201b7ccf11f151245a2a8c7aacf1e&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Conference object 2015 FrancePublisher:American Institute of Aeronautics and Astronautics (AIAA) Authors: Chua, Zarrin K; André, Fabien; Cousy, Mathieu;Chua, Zarrin K; André, Fabien; Cousy, Mathieu;doi: 10.2514/6.2015-2494
International audience; The expected growth in air traffic has resulted in many projects attempting to mitigate the problem of air traffic control, particularly at airports. These projects have focused on characterizing the workload of the air traffic control officer and/or introducing automated technology to assist in his or her responsibilities. Many of these projects have used existing simulation facilities and technology or developed analogous environments to simulate the air traffic control tower. However, such high-fidelity simulation facilities are in limited loca- tions or not easily accessible. Results gathered in simplified environments, while accurate in a controlled setting, may be limited in their extrapolation to real-world applications. Furthermore, little guidance is provided in the literature for developing an ATC tower micro-world, particularly in terms of knowing which elements are most necessary to simu- late and the most effective way to actualize such functions. In this paper, we present the development of an air traffic control tower simulator, specifically for the ground controller, intended for the design and validation of potential automated concepts. We discuss our reasoning for the simulation of specific elements, the hardware and the software used, and our methodology for simulating ATC operations within the tower. This paper concludes with lessons learned and results from the simulation validation, a novel 10-question 5-point Likert scale questionnaire.
Hal-Diderot arrow_drop_down Hal-DiderotConference object . 2015Mémoires en Sciences de l'Information et de la CommunicationConference object . 2015add ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.2514/6.2015-2494&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eu1 citations 1 popularity Average influence Average impulse Average Powered by BIP!more_vert Hal-Diderot arrow_drop_down Hal-DiderotConference object . 2015Mémoires en Sciences de l'Information et de la CommunicationConference object . 2015add ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.2514/6.2015-2494&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article 2023 FrancePublisher:MDPI AG Authors: Jenny Gutierrez-Lopez; Ronald G. McGarvey; Christine Costello; Damon M. Hall;Jenny Gutierrez-Lopez; Ronald G. McGarvey; Christine Costello; Damon M. Hall;doi: 10.3390/su151813316
Waste management is a critical sector that needs to co-ordinate its activities with outcomes that impact society. Multi-criteria decision-making methods for waste management have been widely considered using environmental and economic criteria. With the development of new social regulations and concerns, sustainable waste management needs to additionally target socially acceptable practices. Despite the need to aid solid waste management decision-makers in contemplating the three pillars of sustainability, a limited inclusion of social impact has been found in the multi-objective decision-making literature. This study presents a systematic literature review of multi-criteria decision-making methods in solid waste management. The purpose of this study is threefold. (1) Emphasize the application of multi-objective decision-making methods, summarizing the models that have been used and their applications; (2) provide insights into the quantification of social aspects and their inclusion in decision-making methods, providing a list of social indicators collected from the reviewed studies; (3) offer an analysis of stakeholders’ involvement in waste management. From the articles investigated, one can observe the importance of understanding the local context in which the waste management system is located and the necessity of community consultation to recognize the potential challenges and improvements to solid waste management systems. Consequently, the involvement of stakeholders is crucial during the quantification process of social indicators. In alignment with the findings and needs raised by this review, a methodological approach is suggested for integrating optimization, social aspects, and stakeholders under a waste management context.
add ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.3390/su151813316&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.euAccess Routesgold 0 citations 0 popularity Average influence Average impulse Average Powered by BIP!more_vert add ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.3390/su151813316&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Doctoral thesis 2013 France FrenchAuthors: Devaux, Julian;Devaux, Julian;Our thesis intends to examine the existing dynamic links at the adolescence between daily mobility and socialization, trough the cases of adolescents living in rural areas in the Paris region. For this, we chose to develop a fine and extensive view of mobility, as a spatial and social interaction, and to conduct an ethnography localized in a rural village located in the southeast of Seine et Marne, for nearly two and a half years, combining different methods of data collection (ethnographic interviews, direct and participant observations…). On the one hand, the synchronic analysis of these links can highlight the differentiation between teenagers from differents central elements of their socialization, namely in their mobility, the spatial dimension of their social resources or in their way of living (their uses of different territories, reports to the public and domestics spaces…). In the second hand, the diachronic analysis of links between mobility and socialization can account for all the procedural dimension of differentiation that occurs between them with age, and the socializing effects of mobility, that is to say the ways in which practices transform the dispositions acquired during the primary socialization, in the mobility, their ways of being and acting, and generally how they participate to build their social and cultural identity; Notre travail de thèse entend interroger les liens dynamiques existants entre mobilité quotidienne et socialisation à l'adolescence, au travers du cas d'adolescents résidant au sein de territoires ruraux franciliens. Pour cela, on a fait le choix d'une part de développer une conception particulièrement fine et extensive de la mobilité, qu'on a défini comme étant une interaction spatiale et sociale, ainsi que de procéder à une ethnographie localisée d'un village rural situé dans le sud-est de la Seine-et-Marne, durant près de deux ans et demi, et combinant différentes méthodes de recueil des données (entretiens ethnographiques, observations directe et participante…). D'un côté, l'analyse synchronique de ces liens permet de mettre en évidence une différenciation entre adolescents selon différents éléments centraux de leur socialisation, en l'occurrence dans leur mobilité, la dimension spatiale de leurs ressources sociales ou encore leurs manières d'habiter (usages des différents territoires, rapports à l'espace public et à l'espace domestique…). De l'autre, l'analyse des liens diachroniques entre mobilité et socialisation permet de resituer toute la dimension processuelle de la différenciation qui s'opère entre eux avec l'âge ainsi que les effets socialisants que comportent la mobilité, c'est-à-dire les manières avec lesquelles les pratiques remanient progressivement les dispositions acquises au cours de la socialisation primaire, dans la mobilité, les manières d'être et d'agir et plus largement participent à construire leur identité sociale et culturelle
Archive institutionn... arrow_drop_down Archive institutionnelle IfsttarDoctoral thesis . 2013Data sources: Archive institutionnelle IfsttarMémoires en Sciences de l'Information et de la CommunicationDoctoral thesis . 2013All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=od_______212::e0a1081e7a57b75562913cc80204450b&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eu0 citations 0 popularity Average influence Average impulse Average Powered by BIP!more_vert Archive institutionn... arrow_drop_down Archive institutionnelle IfsttarDoctoral thesis . 2013Data sources: Archive institutionnelle IfsttarMémoires en Sciences de l'Information et de la CommunicationDoctoral thesis . 2013All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=od_______212::e0a1081e7a57b75562913cc80204450b&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Doctoral thesis , Other literature type 2019 France FrenchPublisher:Université Paris-Est Créteil - UPEC Authors: Travailleur, Lucy;Travailleur, Lucy;Les matériaux composites mortier-polymère sont largement utilisés dans l'industrie pour des applications de protection et/ou de réparation de surfaces en béton. En effet, l'ajout de polymère dans les formulations de mortier permet de modifier les propriétés de ces matériaux, en particulier en favorisant leur adhésion tout en réduisant leur perméabilité. Cependant, les études menées sur ces matériaux ne prennent pas en compte les conditions d'application rencontrées sur chantier. En effet, elles sont généralement réalisées sur des pièces massives, alors qu'en réalité ces matériaux sont appliqués en couche mince. En outre, sur chantier, les exigences qui concernent la cure des matériaux ne sont pas toujours appliquées, et des transferts d'eau par évaporation peuvent avoir lieu. Enfin, les études de durabilité ne tiennent pas compte des interactions possibles entre les matériaux et les micro-organismes, ce qui conduit à des dégradations qui restent bien souvent très modérées mais préjudiciables sur le plan esthétique. L'objectif de cette thèse est donc d'étudier le comportement de composites mortier-polymère appliqués en couches minces, lorsqu'ils sont dans un environnement proche de ceux rencontrés sur chantier. Pour cela, des études ont tout d'abord été réalisées afin de mieux comprendre les propriétés des composites mortier-polymère au jeune âge. Un effet retardateur de prise a été mis en évidence en ajoutant des polymères dans la formulation de pâtes de ciment. Il a été attribué partiellement à l'adsorption des particules de polymère à la surface des grains de ciment, mais surtout à la complexation des ions calcium de la solution interstitielle par les polymères qui sont alors hydrolysés. Ensuite, les composites mortier-polymère ont été exposés à un flux d'air pendant leur durcissement, afin de reproduire leur séchage à l'air libre quand les conditions de cure ne sont pas respectées. Les essais ont montré que la présence de polymère ne permet pas de limiter les pertes d'eau par évaporation. De plus, il a été mis en évidence l'influence de l'épaisseur des mortiers. En effet, pour une épaisseur de moins de 20 mm, il n'y a plus assez d'eau après 24 heures de séchage pour pouvoir assurer l'hydratation du ciment.Dans une seconde partie, des études ont été menées sur les mortiers modifiés durcis afin d'évaluer leur résistance à la biocolonisation dans le cadre de leur utilisation pour la protection d'une façade de bâtiment d'une part, et d'une canalisation d'un réseau d'assainissement d'autre part. Dans le premier cas, les résultats montrent un effet du mode de cure, qui demande à être approfondis à travers une nouvelle campagne d'essais. De plus, la colonisation des mortiers a été fortement limitée par leur pH de surface qui était trop élevé même après trois mois. Ces essais permettent donc de préconiser l'application d'un prétraitement abiotique au préalable afin d'abaisser suffisamment le pH de surface des matériaux pour permettre le développement des micro-organismes. Dans le second cas, les résultats ont montré que les composites mortier-polymère ont un comportement similaire à des mortiers non modifiés formulés à base de CEM I. En effet, au bout de quatre mois d'essai, tous les mortiers présentent des profondeurs de détérioration de 0,5 à 1 mm. Ainsi donc, la présence de polymère ne permet pas de limiter la biodétérioration. Polymer-modified mortars are widely used as protection and/or repair materials. Indeed, the addition of polymer allows modifying the properties of materials especially by promoting their adhesion, while reducing their permeability. However, studies rarely take into account the actual conditions of application on worksite. Those studies are generally realised on massive materials whereas, in fact, polymer-modified mortars are applied into thin layers. In addition, on site, the requirements regarding materials curing are not always applied, and water transfers car occur. Finally, studies on material durability do not consider possible interactions between polymer-modified mortars and microorganisms, which lead to moderate yet aesthetically detrimental degradations.Accordingly, the aim of this thesis is to study the behaviour of polymer-modified mortars applied into thin layers when they are exposed to worksite conditions.To do so, studies were realised in order to understand better the properties of polymer-modified mortars at early age. Firstly, it was showed that polymers have a delaying effect on cement hydration. This effect was partially linked to the adsorption of polymer on cement grains, but mostly due to the complexation of calcium ions following polymer hydrolysis. Then, polymer-modified mortars were exposed to an air flow during hardening, in order to simulate their air drying when curing conditions are not respected. It was noted that polymers do not allow slowing down water evaporation. Besides, mortars with a thickness of less than 20 mm do not retain enough water to ensure cement hydration after 24 hours of drying. Further studies were realised on hardened polymer-modified mortars in order to evaluate their resistance to biocolonisation in the case of their use as a protection material for façades and sewer systems. In the first case, results showed an influence of curing on the bioalteration of mortars, which needs to be verified in a new test campaign. Besides, the colonisation of mortars was limited by the high surface pH of the samples, even after three months. This study allowed recommending the necessity of an abiotic pre-treatment in order to reduce the surface pH to allow the growing of microorganisms. In the second case, results showed that polymer-modified mortars behaved the same way as neat Portland mortars. Indeed, after four months of conservation in the biodeterioration chamber, all mortars showed deterioration depths of 0.5 to 1 mm. Thus, the presence of polymers does not limit biodeterioration.
Hyper Article en Lig... arrow_drop_down Archive institutionnelle IfsttarDoctoral thesis . 2019Data sources: Archive institutionnelle IfsttarMémoires en Sciences de l'Information et de la CommunicationDoctoral thesis . 2019All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=od_______212::d0a3035cd4b881dd14086f635b8b895a&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eu0 citations 0 popularity Average influence Average impulse Average Powered by BIP!more_vert Hyper Article en Lig... arrow_drop_down Archive institutionnelle IfsttarDoctoral thesis . 2019Data sources: Archive institutionnelle IfsttarMémoires en Sciences de l'Information et de la CommunicationDoctoral thesis . 2019All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=od_______212::d0a3035cd4b881dd14086f635b8b895a&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article 2017 GermanyPublisher:Springer Science and Business Media LLC Roman Golowin; Maxim Portnyagin; Kaj Hoernle; Folkmar Hauff; Andrey A. Gurenko; Dieter Garbe-Schönberg; Reinhard Werner; Simon Turner;The Ontong Java and Manihiki oceanic plateaus are believed to have formed through high-degree melting of a mantle plume head. Boninite-like, low-Ti basement rocks at Manihiki, however, imply a more complex magma genesis compared with Ontong Java basement lavas that can be generated by ∼30% melting of a primitive mantle source. Here we show that the trace element and isotope compositions of low-Ti Manihiki rocks can best be explained by re-melting of an ultra-depleted source (possibly a common mantle component in the Ontong Java and Manihiki plume sources) re-enriched by ≤1% of an ocean-island-basalt-like melt component. Unlike boninites formed via hydrous flux melting of refractory mantle at subduction zones, these boninite-like intraplate rocks formed through adiabatic decompression melting of refractory plume material that has been metasomatized by ocean-island-basalt-like melts. Our results suggest that caution is required before assuming all Archaean boninites were formed in association with subduction processes. Large igneous provinces may form very quickly, but compositions often differ. Here, the authors find that boninite-like rocks at Manihiki are a result of re-melting of an ultra-depleted source therefore putting into question that all boninitic rocks on Earth must be related to subduction processes.
OceanRep arrow_drop_down Europe PubMed CentralArticle . 2017Full-Text: http://europepmc.org/articles/PMC5309764Data sources: PubMed Centraladd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1038/ncomms14322&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.euAccess RoutesGreen gold 40 citations 40 popularity Top 10% influence Average impulse Top 10% Powered by BIP!more_vert OceanRep arrow_drop_down Europe PubMed CentralArticle . 2017Full-Text: http://europepmc.org/articles/PMC5309764Data sources: PubMed Centraladd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1038/ncomms14322&type=result"></script>'); --> </script>
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description Publicationkeyboard_double_arrow_right Doctoral thesis , Other literature type 2017 France FrenchPublisher:Université Paris-Est Authors: Herrera, Amaury;Herrera, Amaury;Dans le cadre de l’utilisation de plus en plus courante des BFUP dans des structures techniquement ou architecturalement complexes et de la recherche d’optimisation de la quantité de matériau mis en œuvre, cette thèse s’intéresse au fonctionnement des jonctions en BFUP. Son objectif principal est de mettre en évidence les phénomènes physiques qui interviennent dans la jonction et de mieux les retranscrire dans les méthodes de calcul afin de mieux en maîtriser la sécurité et d’optimiser la matière mise en oeuvre.Le travail de thèse s’articule en quatre étapes :-Une étude bibliographique a permis d’établir les bases de connaissances permettant de dimensionner les campagnes expérimentales et de proposer une structure de modélisation des jonctions âme-membrure.-Le développement d’un modèle analytique avancé permettant de prédire le comportement d’une poutre en Té soumise à une sollicitation combinée de flexion longitudinale (et donc de cisaillement longitudinal dans la table) et de flexion transversale.-L’étude expérimentale, à l’échelle du matériau, du comportement des BFUP sous sollicitation de cisaillement pur. Cette étude permet d’enrichir les connaissances sur le comportement des BFUP (données encore indisponibles dans la carte d’identité des différents matériaux) et constitue également une donnée d’entrée pour la compréhension quantitative des phénomènes qui interviennent dans la jonction, à l’échelle de la structure, lorsqu’elle est sollicitée en cisaillement longitudinal.-Enfin, l’essai à rupture de 6 poutres en Té à l’échelle 1 a permis d’étudier le comportement expérimental des jonctions soumises à des sollicitations de cisaillement longitudinal. Les résultats expérimentaux de cette étude ont été comparés aux différentes prédictions analytiques possibles, y compris le modèle proposé.Ces travaux de thèse ont permis d’apporter de nouveaux outils de dimensionnement (notamment dans le cadre de l’étude de la résistance des jonctions en BFUP sous sollicitation de cisaillement pur). Ils mériteraient d’être complétés par des essais de poutres soumis à une sollicitation concomitante de flexion longitudinale et de flexion transversale, pour mieux conforter les méhodes d’analyse proposées Ultra-high performance fiber-reinforced concrete (UHPFRC) are increasingly used for technically or architecturally complex structures and research is going on to optimize design and save implemented material quantities. In this context, this thesis focuses on the mechanical behavior of junctions in UHPFRC structures. The main goal is to highlight physical phenomena occurring in the junctions in order to optimally transpose them into calculation methods. In this way, both safety and cost-efficience should be better controlled.This thesis is divided in four steps :-A literature review enabled to establish the background knowledge allowing to design the experimental campaigns and to suggest a modeling for web-flange junctions.-An advanced analytical model was developed in order to predict the behavior of a T-beam subjected to combined longitudinal bending (and therefore longitudinal shear in the table) and transverse bending.-The expérimental study, at the material scale, of UHPFRC behavior under pure shear stress, allowed enriching the knowledge in this field (data still unavailable in the identity card of current UHPFRC mixes). It also constituted an input for the quantitative understanding of the phenomena occuring in the junction, at the structure scale, when it is loaded in longitudinal shear.-Finally, the test of 6 full scale T-beams up to failure made it possible to study the experimental behavior of the junctions subjected to longitudinal shear stresses. The experimental results were compared with the various analytical predictions, including the proposed model.A new approch has thus been proposed to design junctions under longitudinal shear. It should be completed with experiments on T-beams under combined longitudinal and transverse bending to further validate the proposed analysis methods
Archive institutionn... arrow_drop_down Archive institutionnelle IfsttarDoctoral thesis . 2017Data sources: Archive institutionnelle IfsttarMémoires en Sciences de l'Information et de la CommunicationDoctoral thesis . 2017All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=od_______212::15c1349c64e73c4cec3dd2e353a65c8c&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eu0 citations 0 popularity Average influence Average impulse Average Powered by BIP!more_vert Archive institutionn... arrow_drop_down Archive institutionnelle IfsttarDoctoral thesis . 2017Data sources: Archive institutionnelle IfsttarMémoires en Sciences de l'Information et de la CommunicationDoctoral thesis . 2017All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=od_______212::15c1349c64e73c4cec3dd2e353a65c8c&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article , Other literature type 2011 Germany, Belgium, France, France, FrancePublisher:American Geophysical Union (AGU) Helmuth Thomas; Elizabeth H. Shadwick; Frank Dehairs; Bruno Lansard; Alfonso Mucci; Jacques Navez; Yves Gratton; Friederike Prowe; Melissa Chierici; Agneta Fransson; Tim Papakyriakou; Erika Sternberg; Lisa A. Miller; Jean-Éric Tremblay; Christophe Monnin;The seasonal and spatial variability of dissolved Barium (Ba) in the Amundsen Gulf, southeastern Beaufort Sea, was monitored over a full year from September 2007 to September 2008. Dissolved Ba displays a nutrient-type behavior: the maximum water column concentration is located below the surface layer. The highest Ba concentrations are typically observed at river mouths, the lowest concentrations are found in water masses of Atlantic origin. Barium concentrations decrease eastward through the Canadian Arctic Archipelago. Barite (BaSO4) saturation is reached at the maximum dissolved Ba concentrations in the subsurface layer, whereas the rest of the water column is undersaturated. A three end-member mixing model comprising freshwater from sea-ice melt and rivers, as well as upper halocline water, is used to establish their relative contributions to the Ba concentrations in the upper water column of the Amundsen Gulf. Based on water column and riverine Ba contributions, we assess the depletion of dissolved Ba by formation and sinking of biologically bound Ba (bio-Ba), from which we derive an estimate of the carbon export production. In the upper 50 m of the water column of the Amundsen Gulf, riverine Ba accounts for up to 15% of the available dissolved Ba inventory, of which up to 20% is depleted by bio-Ba formation and export. Since riverine inputs and Ba export occur concurrently, the seasonal variability of dissolved Ba in the upper water column is moderate. Assuming a fixed organic carbon to bio-Ba flux ratio, carbon export out of the surface layer is estimated at 1.8 ± 0.45 mol C m-2 yr-1. Finally, we propose a climatological carbon budget for the Amundsen Gulf based on recent literature data and our findings, the latter bridging the surface and subsurface water carbon cycles.
OceanRep arrow_drop_down Vrije Universiteit Brussel Research PortalOther literature type . 2011Data sources: Vrije Universiteit Brussel Research PortalJournal of Geophysical Research AtmospheresArticle . 2011 . Peer-reviewedLicense: Wiley TDMData sources: Crossrefadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1029/2011jc007120&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.euAccess Routesbronze 33 citations 33 popularity Top 10% influence Average impulse Top 10% Powered by BIP!more_vert OceanRep arrow_drop_down Vrije Universiteit Brussel Research PortalOther literature type . 2011Data sources: Vrije Universiteit Brussel Research PortalJournal of Geophysical Research AtmospheresArticle . 2011 . Peer-reviewedLicense: Wiley TDMData sources: Crossrefadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1029/2011jc007120&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article , Other literature type 2018 Germany, France, France, FrancePublisher:Oxford University Press (OUP) Funded by:EC | MARmaEDEC| MARmaEDFrelat, Romain; Orio, Alessandro; Casini, Michele; Lehmann, Andreas; Mérigot, Bastien; Otto, Saskia A; Sguotti, Camilla; Möllmann, Christian;BONUS Symposium on Science Delivery for Sustainable Use of the Baltic Sea Living Resources, Tallinn, ESTONIA, OCT, 2017; International audience; Fisheries and marine ecosystem-based management requires a holistic understanding of the dynamics of fish communities and their responses to changes in environmental conditions. Environmental conditions can simultaneously shape the spatial distribution and the temporal dynamics of a population, which together can trigger changes in the functional structure of communities. Here, we developed a comprehensive framework based on complementary multivariate statistical methodologies to simultaneously investigate the effects of environmental conditions on the spatial, temporal and functional dynamics of species assemblages. The framework is tested using survey data collected during more than 4000 fisheries hauls over the Baltic Sea between 2001 and 2016. The approach revealed the Baltic fish community to be structured into three sub-assemblages along a strong and temporally stable salinity gradient decreasing from West to the East. Additionally, we highlight a mismatch between species and functional richness associated with a lower functional redundancy in the Baltic Proper compared with other sub-areas, suggesting an ecosystem more susceptible to external pressures. Based on a large dataset of community data analysed in an innovative and comprehensive way, we could disentangle the effects of environmental changes on the structure of biotic communities—key information for the management and conservation of ecosystems.
ICES Journal of Mari... arrow_drop_down ICES Journal of Marine ScienceOther literature type . Article . 2018 . Peer-reviewedLicense: CC BYOceanRepArticle . 2018 . Peer-reviewedFull-Text: http://oceanrep.geomar.de/45244/1/fsy027.pdfData sources: OceanRepArchiMer - Institutional Archive of IfremerOther literature type . 2018Data 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.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1093/icesjms/fsy027&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.euAccess Routeshybrid 8 citations 8 popularity Top 10% influence Average impulse Top 10% Powered by BIP!visibility 4visibility views 4 download downloads 2 Powered bymore_vert ICES Journal of Mari... arrow_drop_down ICES Journal of Marine ScienceOther literature type . Article . 2018 . Peer-reviewedLicense: CC BYOceanRepArticle . 2018 . Peer-reviewedFull-Text: http://oceanrep.geomar.de/45244/1/fsy027.pdfData sources: OceanRepArchiMer - Institutional Archive of IfremerOther literature type . 2018Data 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.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1093/icesjms/fsy027&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article 2020 Germany, FrancePublisher:Frontiers Media SA Funded by:NSF | Collaborative Research: E..., EC | GrIS-MeltNSF| Collaborative Research: Eurasian and Makarov basins observational network targets changes in the Arctic Ocean ,EC| GrIS-MeltAchim Randelhoff; Achim Randelhoff; Johnna Holding; Johnna Holding; Markus Janout; Mikael Kristian Sejr; Mikael Kristian Sejr; Marcel Babin; Marcel Babin; Jean-Éric Tremblay; Jean-Éric Tremblay; Matthew B. Alkire;Arctic Ocean primary productivity is limited by light and inorganic nutrients. With sea ice cover declining in recent decades, nitrate limitation has been speculated to become more prominent. Although much has been learned about nitrate supply from general patterns of ocean circulation and water column stability, a quantitative analysis requires dedicated turbulence measurements that have only started to accumulate in the last dozen years. Here we present new observations of the turbulent vertical nitrate flux in the Laptev Sea, Baffin Bay, and Young Sound (North-East Greenland), supplementing a compilation of 13 published estimates throughout the Arctic Ocean. Combining all flux estimates with a Pan-Arctic database of in situ measurements of nitrate concentration and density, we found the annual nitrate inventory to be largely determined by the strength of stratification and by bathymetry. Nitrate fluxes explained the observed regional patterns and magnitudes of both new primary production and particle export on annual scales. We argue that with few regional exceptions, vertical turbulent nitrate fluxes can be a reliable proxy of Arctic primary production accessible through autonomous and large-scale measurements. They may also provide a framework to assess nutrient limitation scenarios based on clear energetic and mass budget constraints resulting from turbulent mixing and freshwater flows.
OceanRep; Frontiers ... arrow_drop_down Electronic Publication Information CenterArticle . 2020Data sources: Electronic Publication Information CenterMémoires en Sciences de l'Information et de la CommunicationArticle . 2020Full-Text: https://hal.science/hal-03094859/documentadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.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 Routesgold 78 citations 78 popularity Top 1% influence Top 10% impulse Top 1% Powered by BIP!more_vert OceanRep; Frontiers ... arrow_drop_down Electronic Publication Information CenterArticle . 2020Data sources: Electronic Publication Information CenterMémoires en Sciences de l'Information et de la CommunicationArticle . 2020Full-Text: https://hal.science/hal-03094859/documentadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.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 Doctoral thesis 2017 FranceAuthors: Charroyer, Lucien;Charroyer, Lucien;Ces travaux s’inscrivent dans le cadre des recherches destinées à réduire ou à éliminer le bruit de crissement émis par les véhicules ferroviaires en courbe ou au freinage. Ces bruits peuvent en effet atteindre des niveaux sonores très élevés, jusqu’à 105 dB(A) à proximité des rames en cas de freinage par exemple, et constituent une gêne importante pour les usagers et les riverains. Afin d’apporter des solutions de réduction de ce bruit de crissement, on se concentre sur la modélisation des vibrations auto-entretenues de structures avec contact frottant ainsi que sur la compréhension des mécanismes à l’origine du crissement résultant, en particulier dans le cas d’un frein à disque ferroviaire. On fait l’hypothèse que les vibrations ont pour origine un couplage de modes de la structure dans les directions tangentielles et normale à l’interface en contact frottant. Ce couplage entraîne une instabilité de l’équilibre quasi-statique glissant du système et l’apparition de vibrations auto-entretenues. On cherche à déterminer ces vibrations par le calcul ce qui s’effectue en deux étapes. Dans un premier temps, l’analyse de stabilité de l’équilibre quasi-statique du système permet de déterminer l’occurrence des vibrations. Dans cette thèse, deux hypothèses de modélisation du frottement – plan ou rectiligne – sont comparées dans le cas d’un modèle académique minimal. Dans le cas non-amorti, on montre que l’hypothèse simplificatrice du frottement rectiligne tend à stabiliser le système. Dans le cas amorti, on constate que les résultats établis dans la littérature pour un frottement rectiligne, en particulier le paradoxe de déstabilisation, ne sont pas facilement généralisables au cas du frottement plan bien que des similitudes existent. Dans un deuxième temps, une analyse non-linéaire est nécessaire pour déterminer les amplitudes et le contenu fréquentiel précis des vibrations auto-entretenues. Cette étape est généralement effectuée à l’aide d’une intégration temporelle numérique à partir de conditions initiales données, proches de l’équilibre glissant. En examinant l’évolution temporelle des vibrations obtenues à l’aide de cette technique, on peut distinguer d’une part le régime transitoire au cours duquel les non-linéarités apparaissent et stabilisent progressivement la solution instable, et d’autre part le régime stationnaire (ou régime de fonctionnement) où les amplitudes vibratoires sont stabilisées. Dans le cas du modèle académique, une analyse rigoureuse des échanges énergétiques au cours de l’évolution temporelle permet de mettre en évidence l’origine de la stabilisation des vibrations, en particulier la baisse du taux de puissance injectée au contact résultant de l’accumulation des événements fortement non-linéaires : décollements, adhérences ou chocs. L’intégration temporelle directe n’est toutefois pas adaptée à des modèles numériques comportant de nombreux degrés de liberté et pour lesquels la détermination du régime stationnaire est généralement suffisante pour proposer des solutions de réduction. Le surcoût de calcul engendré par le régime transitoire est en effet très limitant. C’est pourquoi, une méthode est proposée pour approximer directement le régime stationnaire dans le cas d’un système mono-instable. Cette méthode combine une technique de tir à une initialisation basée sur les observations énergétiques ci-dessus. Elle est d’abord validée sur le modèle minimal puis adaptée au modèle éléments finis de frein ferroviaire moyennant une approximation originale de la technique de tir : la réduction de l’espace des phases des conditions initiales. Les approximations des régimes stationnaires sont comparées avec ceux obtenus par l’intégration temporelle directe. Les avantages et les limitations de la méthode sont discutés. This work is part of research intended to mitigate or eliminate the squeal noise produced by railway vehicles in curves or during braking. For instance, brake noise can reach very high sound levels up to 105 dB(A) close to the trains and constitutes an important nuisance for passengers and residents in the station. In order to provide some mitigation measures, the study focuses on the modelling of self-sustained structural vibrations in presence of frictional contact and the understanding of the squeal generation mechanism, especially for of a railway disc brake. It is assumed that vibration is due to structural mode coupling in the normal and tangential directions at the frictional interface. This coupling leads to instability of the sliding quasistatic equilibrium of the system and the occurrence of self-sustained vibrations. Two steps are necessary to calculate these vibrations. Firstly, the occurrence of the vibrations is determined through the stability analysis of the quasi-static equilibrium. In this thesis, two modelling assumptions for the friction law – planar or rectilinear – are compared in the case of an academic model. Without damping, the simplified rectilinear friction law tends to stabilize the system. With damping, the results established in the literature in case of rectilinear friction, especially the destabilization paradox, cannot be applied generally in case of planar friction even if similarities may be observed. Secondly, a nonlinear analysis is necessary and performed to calculate the amplitudes and the detailed spectral content of the self-sustained vibrations. This step is generally performed by using numerical time integration from given initial conditions, close to the equilibrium. Taking a look at the vibrations time histories obtained by this technique, two different states may be distinguished. In the transient state, nonlinear forces appear and gradually stabilize the unstable solution whereas in the steady (stationary) state, vibrations are stabilized. In the case of the academic model, the cause of the stabilization is highlighted thanks to a rigorous analysis of energy exchanges, especially the decrease of the power rate injected via the contact interface resulting from the accumulation of strongly nonlinear events like loss of contact, stick or impacts. However, direct time integration is not very appropriate in the case of large numerical models with many degrees of freedom. Indeed, the additional computational cost due to the transient state is very high although the determination of the steady state is generally sufficient from a practical point of view. Consequently, a method is proposed in order to directly approximate the steady state in case of mono-instability. This method combines a shooting technique with an initialization based on the above energy considerations. It is first validated on the minimal model and then transposed to the finite element model of a railway disc brake through an original approximation of the shooting technique : the reduction of the initial conditions phase space. The estimations of the steady states are compared with those obtained by direct time integration. The advantages and the limitations of the method are discussed.
Hyper Article en Lig... arrow_drop_down Hyper Article en Ligne; Mémoires en Sciences de l'Information et de la CommunicationOther literature type . Doctoral thesis . 2017Archive institutionnelle IfsttarDoctoral thesis . 2017Data sources: Archive institutionnelle IfsttarAll Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=od_______212::a39201b7ccf11f151245a2a8c7aacf1e&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eu0 citations 0 popularity Average influence Average impulse Average Powered by BIP!more_vert Hyper Article en Lig... arrow_drop_down Hyper Article en Ligne; Mémoires en Sciences de l'Information et de la CommunicationOther literature type . Doctoral thesis . 2017Archive institutionnelle IfsttarDoctoral thesis . 2017Data sources: Archive institutionnelle IfsttarAll Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=od_______212::a39201b7ccf11f151245a2a8c7aacf1e&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Conference object 2015 FrancePublisher:American Institute of Aeronautics and Astronautics (AIAA) Authors: Chua, Zarrin K; André, Fabien; Cousy, Mathieu;Chua, Zarrin K; André, Fabien; Cousy, Mathieu;doi: 10.2514/6.2015-2494
International audience; The expected growth in air traffic has resulted in many projects attempting to mitigate the problem of air traffic control, particularly at airports. These projects have focused on characterizing the workload of the air traffic control officer and/or introducing automated technology to assist in his or her responsibilities. Many of these projects have used existing simulation facilities and technology or developed analogous environments to simulate the air traffic control tower. However, such high-fidelity simulation facilities are in limited loca- tions or not easily accessible. Results gathered in simplified environments, while accurate in a controlled setting, may be limited in their extrapolation to real-world applications. Furthermore, little guidance is provided in the literature for developing an ATC tower micro-world, particularly in terms of knowing which elements are most necessary to simu- late and the most effective way to actualize such functions. In this paper, we present the development of an air traffic control tower simulator, specifically for the ground controller, intended for the design and validation of potential automated concepts. We discuss our reasoning for the simulation of specific elements, the hardware and the software used, and our methodology for simulating ATC operations within the tower. This paper concludes with lessons learned and results from the simulation validation, a novel 10-question 5-point Likert scale questionnaire.
Hal-Diderot arrow_drop_down Hal-DiderotConference object . 2015Mémoires en Sciences de l'Information et de la CommunicationConference object . 2015add ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.2514/6.2015-2494&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eu1 citations 1 popularity Average influence Average impulse Average Powered by BIP!more_vert Hal-Diderot arrow_drop_down Hal-DiderotConference object . 2015Mémoires en Sciences de l'Information et de la CommunicationConference object . 2015add ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.2514/6.2015-2494&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article 2023 FrancePublisher:MDPI AG Authors: Jenny Gutierrez-Lopez; Ronald G. McGarvey; Christine Costello; Damon M. Hall;Jenny Gutierrez-Lopez; Ronald G. McGarvey; Christine Costello; Damon M. Hall;doi: 10.3390/su151813316
Waste management is a critical sector that needs to co-ordinate its activities with outcomes that impact society. Multi-criteria decision-making methods for waste management have been widely considered using environmental and economic criteria. With the development of new social regulations and concerns, sustainable waste management needs to additionally target socially acceptable practices. Despite the need to aid solid waste management decision-makers in contemplating the three pillars of sustainability, a limited inclusion of social impact has been found in the multi-objective decision-making literature. This study presents a systematic literature review of multi-criteria decision-making methods in solid waste management. The purpose of this study is threefold. (1) Emphasize the application of multi-objective decision-making methods, summarizing the models that have been used and their applications; (2) provide insights into the quantification of social aspects and their inclusion in decision-making methods, providing a list of social indicators collected from the reviewed studies; (3) offer an analysis of stakeholders’ involvement in waste management. From the articles investigated, one can observe the importance of understanding the local context in which the waste management system is located and the necessity of community consultation to recognize the potential challenges and improvements to solid waste management systems. Consequently, the involvement of stakeholders is crucial during the quantification process of social indicators. In alignment with the findings and needs raised by this review, a methodological approach is suggested for integrating optimization, social aspects, and stakeholders under a waste management context.
add ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.3390/su151813316&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.euAccess Routesgold 0 citations 0 popularity Average influence Average impulse Average Powered by BIP!more_vert add ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.3390/su151813316&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Doctoral thesis 2013 France FrenchAuthors: Devaux, Julian;Devaux, Julian;Our thesis intends to examine the existing dynamic links at the adolescence between daily mobility and socialization, trough the cases of adolescents living in rural areas in the Paris region. For this, we chose to develop a fine and extensive view of mobility, as a spatial and social interaction, and to conduct an ethnography localized in a rural village located in the southeast of Seine et Marne, for nearly two and a half years, combining different methods of data collection (ethnographic interviews, direct and participant observations…). On the one hand, the synchronic analysis of these links can highlight the differentiation between teenagers from differents central elements of their socialization, namely in their mobility, the spatial dimension of their social resources or in their way of living (their uses of different territories, reports to the public and domestics spaces…). In the second hand, the diachronic analysis of links between mobility and socialization can account for all the procedural dimension of differentiation that occurs between them with age, and the socializing effects of mobility, that is to say the ways in which practices transform the dispositions acquired during the primary socialization, in the mobility, their ways of being and acting, and generally how they participate to build their social and cultural identity; Notre travail de thèse entend interroger les liens dynamiques existants entre mobilité quotidienne et socialisation à l'adolescence, au travers du cas d'adolescents résidant au sein de territoires ruraux franciliens. Pour cela, on a fait le choix d'une part de développer une conception particulièrement fine et extensive de la mobilité, qu'on a défini comme étant une interaction spatiale et sociale, ainsi que de procéder à une ethnographie localisée d'un village rural situé dans le sud-est de la Seine-et-Marne, durant près de deux ans et demi, et combinant différentes méthodes de recueil des données (entretiens ethnographiques, observations directe et participante…). D'un côté, l'analyse synchronique de ces liens permet de mettre en évidence une différenciation entre adolescents selon différents éléments centraux de leur socialisation, en l'occurrence dans leur mobilité, la dimension spatiale de leurs ressources sociales ou encore leurs manières d'habiter (usages des différents territoires, rapports à l'espace public et à l'espace domestique…). De l'autre, l'analyse des liens diachroniques entre mobilité et socialisation permet de resituer toute la dimension processuelle de la différenciation qui s'opère entre eux avec l'âge ainsi que les effets socialisants que comportent la mobilité, c'est-à-dire les manières avec lesquelles les pratiques remanient progressivement les dispositions acquises au cours de la socialisation primaire, dans la mobilité, les manières d'être et d'agir et plus largement participent à construire leur identité sociale et culturelle
Archive institutionn... arrow_drop_down Archive institutionnelle IfsttarDoctoral thesis . 2013Data sources: Archive institutionnelle IfsttarMémoires en Sciences de l'Information et de la CommunicationDoctoral thesis . 2013All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=od_______212::e0a1081e7a57b75562913cc80204450b&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eu0 citations 0 popularity Average influence Average impulse Average Powered by BIP!more_vert Archive institutionn... arrow_drop_down Archive institutionnelle IfsttarDoctoral thesis . 2013Data sources: Archive institutionnelle IfsttarMémoires en Sciences de l'Information et de la CommunicationDoctoral thesis . 2013All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=od_______212::e0a1081e7a57b75562913cc80204450b&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Doctoral thesis , Other literature type 2019 France FrenchPublisher:Université Paris-Est Créteil - UPEC Authors: Travailleur, Lucy;Travailleur, Lucy;Les matériaux composites mortier-polymère sont largement utilisés dans l'industrie pour des applications de protection et/ou de réparation de surfaces en béton. En effet, l'ajout de polymère dans les formulations de mortier permet de modifier les propriétés de ces matériaux, en particulier en favorisant leur adhésion tout en réduisant leur perméabilité. Cependant, les études menées sur ces matériaux ne prennent pas en compte les conditions d'application rencontrées sur chantier. En effet, elles sont généralement réalisées sur des pièces massives, alors qu'en réalité ces matériaux sont appliqués en couche mince. En outre, sur chantier, les exigences qui concernent la cure des matériaux ne sont pas toujours appliquées, et des transferts d'eau par évaporation peuvent avoir lieu. Enfin, les études de durabilité ne tiennent pas compte des interactions possibles entre les matériaux et les micro-organismes, ce qui conduit à des dégradations qui restent bien souvent très modérées mais préjudiciables sur le plan esthétique. L'objectif de cette thèse est donc d'étudier le comportement de composites mortier-polymère appliqués en couches minces, lorsqu'ils sont dans un environnement proche de ceux rencontrés sur chantier. Pour cela, des études ont tout d'abord été réalisées afin de mieux comprendre les propriétés des composites mortier-polymère au jeune âge. Un effet retardateur de prise a été mis en évidence en ajoutant des polymères dans la formulation de pâtes de ciment. Il a été attribué partiellement à l'adsorption des particules de polymère à la surface des grains de ciment, mais surtout à la complexation des ions calcium de la solution interstitielle par les polymères qui sont alors hydrolysés. Ensuite, les composites mortier-polymère ont été exposés à un flux d'air pendant leur durcissement, afin de reproduire leur séchage à l'air libre quand les conditions de cure ne sont pas respectées. Les essais ont montré que la présence de polymère ne permet pas de limiter les pertes d'eau par évaporation. De plus, il a été mis en évidence l'influence de l'épaisseur des mortiers. En effet, pour une épaisseur de moins de 20 mm, il n'y a plus assez d'eau après 24 heures de séchage pour pouvoir assurer l'hydratation du ciment.Dans une seconde partie, des études ont été menées sur les mortiers modifiés durcis afin d'évaluer leur résistance à la biocolonisation dans le cadre de leur utilisation pour la protection d'une façade de bâtiment d'une part, et d'une canalisation d'un réseau d'assainissement d'autre part. Dans le premier cas, les résultats montrent un effet du mode de cure, qui demande à être approfondis à travers une nouvelle campagne d'essais. De plus, la colonisation des mortiers a été fortement limitée par leur pH de surface qui était trop élevé même après trois mois. Ces essais permettent donc de préconiser l'application d'un prétraitement abiotique au préalable afin d'abaisser suffisamment le pH de surface des matériaux pour permettre le développement des micro-organismes. Dans le second cas, les résultats ont montré que les composites mortier-polymère ont un comportement similaire à des mortiers non modifiés formulés à base de CEM I. En effet, au bout de quatre mois d'essai, tous les mortiers présentent des profondeurs de détérioration de 0,5 à 1 mm. Ainsi donc, la présence de polymère ne permet pas de limiter la biodétérioration. Polymer-modified mortars are widely used as protection and/or repair materials. Indeed, the addition of polymer allows modifying the properties of materials especially by promoting their adhesion, while reducing their permeability. However, studies rarely take into account the actual conditions of application on worksite. Those studies are generally realised on massive materials whereas, in fact, polymer-modified mortars are applied into thin layers. In addition, on site, the requirements regarding materials curing are not always applied, and water transfers car occur. Finally, studies on material durability do not consider possible interactions between polymer-modified mortars and microorganisms, which lead to moderate yet aesthetically detrimental degradations.Accordingly, the aim of this thesis is to study the behaviour of polymer-modified mortars applied into thin layers when they are exposed to worksite conditions.To do so, studies were realised in order to understand better the properties of polymer-modified mortars at early age. Firstly, it was showed that polymers have a delaying effect on cement hydration. This effect was partially linked to the adsorption of polymer on cement grains, but mostly due to the complexation of calcium ions following polymer hydrolysis. Then, polymer-modified mortars were exposed to an air flow during hardening, in order to simulate their air drying when curing conditions are not respected. It was noted that polymers do not allow slowing down water evaporation. Besides, mortars with a thickness of less than 20 mm do not retain enough water to ensure cement hydration after 24 hours of drying. Further studies were realised on hardened polymer-modified mortars in order to evaluate their resistance to biocolonisation in the case of their use as a protection material for façades and sewer systems. In the first case, results showed an influence of curing on the bioalteration of mortars, which needs to be verified in a new test campaign. Besides, the colonisation of mortars was limited by the high surface pH of the samples, even after three months. This study allowed recommending the necessity of an abiotic pre-treatment in order to reduce the surface pH to allow the growing of microorganisms. In the second case, results showed that polymer-modified mortars behaved the same way as neat Portland mortars. Indeed, after four months of conservation in the biodeterioration chamber, all mortars showed deterioration depths of 0.5 to 1 mm. Thus, the presence of polymers does not limit biodeterioration.
Hyper Article en Lig... arrow_drop_down Archive institutionnelle IfsttarDoctoral thesis . 2019Data sources: Archive institutionnelle IfsttarMémoires en Sciences de l'Information et de la CommunicationDoctoral thesis . 2019All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=od_______212::d0a3035cd4b881dd14086f635b8b895a&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eu0 citations 0 popularity Average influence Average impulse Average Powered by BIP!more_vert Hyper Article en Lig... arrow_drop_down Archive institutionnelle IfsttarDoctoral thesis . 2019Data sources: Archive institutionnelle IfsttarMémoires en Sciences de l'Information et de la CommunicationDoctoral thesis . 2019All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=od_______212::d0a3035cd4b881dd14086f635b8b895a&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article 2017 GermanyPublisher:Springer Science and Business Media LLC Roman Golowin; Maxim Portnyagin; Kaj Hoernle; Folkmar Hauff; Andrey A. Gurenko; Dieter Garbe-Schönberg; Reinhard Werner; Simon Turner;The Ontong Java and Manihiki oceanic plateaus are believed to have formed through high-degree melting of a mantle plume head. Boninite-like, low-Ti basement rocks at Manihiki, however, imply a more complex magma genesis compared with Ontong Java basement lavas that can be generated by ∼30% melting of a primitive mantle source. Here we show that the trace element and isotope compositions of low-Ti Manihiki rocks can best be explained by re-melting of an ultra-depleted source (possibly a common mantle component in the Ontong Java and Manihiki plume sources) re-enriched by ≤1% of an ocean-island-basalt-like melt component. Unlike boninites formed via hydrous flux melting of refractory mantle at subduction zones, these boninite-like intraplate rocks formed through adiabatic decompression melting of refractory plume material that has been metasomatized by ocean-island-basalt-like melts. Our results suggest that caution is required before assuming all Archaean boninites were formed in association with subduction processes. Large igneous provinces may form very quickly, but compositions often differ. Here, the authors find that boninite-like rocks at Manihiki are a result of re-melting of an ultra-depleted source therefore putting into question that all boninitic rocks on Earth must be related to subduction processes.
OceanRep arrow_drop_down Europe PubMed CentralArticle . 2017Full-Text: http://europepmc.org/articles/PMC5309764Data sources: PubMed Centraladd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1038/ncomms14322&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.euAccess RoutesGreen gold 40 citations 40 popularity Top 10% influence Average impulse Top 10% Powered by BIP!more_vert OceanRep arrow_drop_down Europe PubMed CentralArticle . 2017Full-Text: http://europepmc.org/articles/PMC5309764Data sources: PubMed Centraladd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1038/ncomms14322&type=result"></script>'); --> </script>
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