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Nombre de programmes trouvés : 1855
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Atelier 2 : Phénomènes invisibles, récits improbables

Les migrations sont omniprésentes dans les discours publics. Pourtant, sans doute plus que tout autre phénomène, elles se caractérisent par la difficulté à les décrire, à les représenter. La géographie peut-elle se saisir de ces phénomènes en dépit de la complexité à cartographier les flux migratoires ? Les sciences sociales peuvent-elles comprendre les expériences vécues par les migrants malgré les difficultés à les représenter et les recueillir ? Les discours liés aux migrations diffusent davantage des récits de délinquants ou de bénéficiaires des systèmes de sécurité sociale que d’entrepreneurs ou de créateurs. Les récits des migrants restent trop souvent des ...
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Atelier 3 : Multiterritorialités, circulations migratoires, double exil et double présence

Qu’ils soient considérés comme des clandestins, des sans-papiers, des déplacés, des réfugiés, des migrants ou des enfants d’immigrés, leur expérience ne peut s’évaluer au seul prisme du pays d’origine ou de résidence. En quoi les situations qui ont déterminé le départ continuent-elles d’influer sur les expériences migratoires elles-mêmes ? Les questions du retour – le sien, celui de la famille, des enfants – et surtout les liens entretenus avec le village, la région, le pays d’origine, sont à la fois déterminantes et évolutives. Innovantes à plus d’un titre, les approches classiques en termes de diaspora, de transnationalisme ou de circulation ...
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le (17m29s)

Comparison of Simulated Tree-Ring Cellulose d180 at the European Scale

In order to investigate factors involved in the inter-annual variability of d180 in tree ring cellulose (d18OTRC), we simulated the d18OTRC from 1960 to 2001 over Europe. We used 1) simulated climate and water isotope fields of REMOiso, a meso-scale circulation model, 2) hypotheses of the distribution of roots and soil hydrology, and 3) a mechanistic model of oxygen-isotopes in tree ring cellulose (d18OTRC). Sensitivity tests show that relative humidity of the air and soil water d18O contribute differently to the d180 in tree ring cellulose according to regional climate. In the commonly observed hydrological situation, humidity of the air ...
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Holocene Climatic Changes and Their Effect on Morphodynamics and Sedimentation in Campania

High-resolution paleoclimatic studies (e.g. 18O, 13C, CH4, MS, ect) provide 38 detailed reconstructions of the Holocene climatic variability, but they don’t are unable to provide direct informations about the effects of the climatic changes on landscape and human ecosystems. In order to assess the response of the subaerial geomorphologic/pedo-sedimentary systems to the climatic changes and their potential impact on the ancient human communities, detailed stratigraphical investigations in Campania (southern Italy) have been carried out. In addition to indications provided by litho-pedostratigraphical and geomorphological investigations, the study has recurred to historical, archaeological, and palaeobiological data. Some of the main global cyclical ...
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The State of UK Climate Modelling

The UK recently invested £23 million (~US$40 million) in a program in Quantifying and Understanding the Earth SysTem (QUEST). The final product of this investment is the state-of-the-art QUEST Earth System Model (QUESM), which is comprised of the most comprehensive modeling and understanding of terrestrial, atmosphere, and marine processes ever built. QUESM is to be linked with the world-leading Hadley Centre’s GCM to assess and understand changes in the Earth system with respect to climate and global change. Here, I present the state of UK climate modeling, an overview of the QUEST Earth System Model, and detail the individual sub-models ...
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Data-Model Fusion Approach in Global Change Research: Recent Development and Future Challenges

It is increasingly recognized that global change research requires methods and strategies for combing process models and data in systematic ways. This is leading to research towards the application of model-data fusion approach. The model-data fusion is a new quantitative approach to model analysis and data assimilation that provides a high level of empirical constraint over model predictions based on observations. Applications of model-data fusion require (a) a model that describes the underlying physical, chemical and biological processes, (b) experimental observations and (c) an optimization tool. The optimization tool is used to find optimal estimates of model parameters or states ...
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Setting Cumulative Emissions Targets to Reduce the Risk of "Dangerous" Climate Change

The ultimate objective of climate change mitigation is to reduce the amount of anthropogenic greenhouse gas (GHG) emissions in order to achieve “stabilization of greenhouse gas concentrations in the atmosphere at a level that would prevent dangerous anthropogenic interference with the climate system” (UNFCCC, Article 2). This statement raises a number of questions regarding (i) what “dangerous interference” means, (ii) what GHG concentration level may considered “safe”, and (iii) what emissions pathway should be taken towards stabilization. Here we present a novel approach to coupled climate-carbon cycle modelling which allows one to estimate the probability that any given level of ...
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le (35m28s)

Industrial and Environmental Policies: Reciprocal Impacts

Total as a key player of the Oil and Gas industry is providing answers to 25 environmental challenges. In that respect, it has already developed environmental objectives and policies. Its environmental footprints is being assessed, controlled and reduced with a set of concrete means to improve its performance, a better selection of major challenges and a better report to external stake holders. Energy and climate issues are inextricably interwoven, which means that we have to help to reconcile the objectives of today’s society, pursuing economic growth while protecting the climate for future generations. Faced with this predicament, we are ...
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Social Impact of global Environmental Change on Farming Communities on the Ogoli River Bank in Otukpo Area of Benue State, Nigeria

One of the manifestations of the global change in this study area is a marked reduction in the duration and amount of rainfall. This adversely affects the volume of the head waters that ultimately determine the volume of the Ogoli River which is used for irrigation. Consequently, food security and livelihood of the farming communities whose mode of agricultural production is rain-fed is adversely affected. Using Participatory Learning Action (PLA) technique involving three distinct groups of adult male, adult female and youth, the study seek to evaluate the coping mechanisms of these vulnerable group to draught and reduced volume of ...
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