121 research outputs found
Les « Magasins Dessenne »
No full textDevolder Maud, Caloi Ilaria, Claeys Thérèse. Les « Magasins Dessenne ». In: Bulletin de correspondance hellénique. Volume 138, livraison 2, 2014. pp. 775-781
Derogation on the EU Nitrates Directive: does it make a difference?
No full textThe paper discusses an ex ante evaluation of the derogation on the Nitrates Directive for Flanders, Belgium, which is a case of intensive but highly productive livestock areas. The aim is to develop an accurate simulation model to detect small differences in manure surpluses caused by changes of manure production and/or utilization. The system of models consists of various modules to fine tune the calculations of manure production, fertilizing behaviour and manure allocation and disposal on and off farm. The results show that derogation may cause the existing manure surpluses to expire, if only nitrogen limits are considered and no transactions costs are taken into account. When also phosphate fertilization limits are considered, the increase in manuring possibilities is much lower than expected. Ongoing research focuses on the marginal shifts in manure surplus at farm level and possible effects of transactions costs.Nitrates Directive, derogation, modelling, Environmental Economics and Policy, Livestock Production/Industries,
Utopia at Five Hundred: Some Reflections
No full textPublished in 1516, Thomas More's Utopia has come to signify attempts to reform society in a dramatic, radical, and substantial manner. Thanks to the influence of Karl Marx in the twentieth century, it has become identified as the classic precursor of the modern argument for communism as the solution to mankind's most essential woes. This article will sketch the main themes and context of Utopia, suggesting that to modern readers More presents a highly ambiguous, even "dystopian" portrait of an "ideal society." It then trace the contours of the development of the utopian idea across the centuries to the present, focussing on the relationship between utopianism and millenarianism in particular, and the development of euchronia and the modern idea of progress in the eighteenth century. It will then ask what relevance, if any, More's central themes have to the modern reader, and suggest that in its warnings about the effects of machinery upon humanity and in its varied visions of global environmental catastrophe the dystopian tradition offers later modern readers a stark warning about our possible future.A&HCIARTICLE3,SI402-4112
Promouvoir l’intermodalité au quotidien - Les pôles d’échanges en Wallonie
No full textCe vade-mecum s’inscrit dans la continuité de la recherche ‘Urbanisation des noeuds et mixité des fonctions’ (CPDT 2017-2018) à laquelle Bianchet Bruno, Blaffart Maud, Claeys Dorian, Dupont Xavier, Maldague Hubert, Regnier-Sakamoto Pénélope, Van Ngoc Hélène ont participé.
Les publications de la CPDT sont consultables et téléchargeables sur le site http://cpdt.wallonie.be
Introduction générale
No full textNational audienceMontagnes et méditerranéennes tout à la fois, les Alpes du Sud ont des airs d’entre-deux territorial. De cet entre-deux, elles ont tiré leur identité. Frontière poreuse, espace refuge tout autant qu’à risque, tour à tour trop vide ou trop plein, ce territoire a su s’adapter, se renouveler face aux aléas socio-environnementaux des siècles passés. Qu’en est-il aujourd’hui face aux crises environnementales et sanitaires qui amènent nos sociétés contemporaines à s’interroger sur leurs fondements socio-économiques et culturels ? Comment les Alpes du Sud répondent-elles aux impératifs de transition ? Les Alpes du Sud sont aussi un entre-deux académique, loin des grandes villes universitaires. Pourtant, grâce au soutien des collectivités territoriales, elles accueillent de longue date des activités scientifiques et pédagogiques qui scrutent les dynamiques socio-environnementales de ce territoire, aujourd’hui réunies aux seins des pôles universitaires de Gap et de Digne rattachés à Aix-Marseille Université. Cet ouvrage collectif réunit l’expertise d’universitaires, d’experts, d’acteurs sociopolitiques impliqués de longue date dans la recherche, l’enseignement et l’action au service du développement durable des Alpes du Sud. Ils associent ici leurs analyses et leurs expériences pour proposer un état des lieux interdisciplinaire des grands enjeux socio-environnementaux de ce territoire singulier
Quotient-space boundary element methods for scattering at complex screens
No full textInternational audienceA complex screen is an arrangement of panels that may not be even locally orientable because of junction lines. A comprehensive trace space framework for first-kind variational boundary integral equations on complex screens has been established in Claeys and Hiptmair (Integr Equ Oper Theory 77:167–197, 2013. https://doi.org/10.1007/s00020-013-2085-x) for the Helmholtz equation, and in Claeys and Hiptmair (Integr Equ Oper Theory 84:33–68, 2016. https://doi.org/10.1007/s00020-015-2242-5) for Maxwell’s equations in frequency domain. The gist is a quotient space perspective that allows to make sense of jumps of traces as factor spaces of multi-trace spaces modulo single-trace spaces without relying on orientation. This paves the way for formulating first-kind boundary integral equations in weak form posed on energy trace spaces. In this article we extend that idea to the Galerkin boundary element (BE) discretization of first-kind boundary integral equations. Instead of trying to approximate jumps directly, the new quotient space boundary element method employs a Galerkin BE approach in multi-trace boundary element spaces. This spawns discrete boundary integral equations with large null spaces comprised of single-trace functions. Yet, since the right-hand-sides of the linear systems of equations are consistent, Krylov subspace iterative solvers like GMRES are not affected by the presence of a kernel and still converge to a solution. This is strikingly confirmed by numerical tests
Fertilization: trade-offs between manure abatement and plant productivity
No full textIn 2005, 30% of the Flemish farms faced a manure excess, while at aggregated level still 9.7% of the emission rights were unused. This means that, despite the various possibilities, Flemish farmers do not succeed in an effective exchange of manure between farms. In current paper is shown how inorganic fertilizer use influences the use and exchange of organic nitrogen. Because of the mutual interdependency between organic and inorganic nitrogen emission rights (or quota), inorganic nitrogen use limits the emission rights for organic nitrogen. Utilisation of these emission rights are analysed as a trade-offs choice between plant productivity (use of inorganic nitrogen) and manure disposal, as the major abatement alternative of manure production. Farmers still prefer inorganic fertilizers because of their effect on plant productivity and income. However, by changing the quota rent of organic nitrogen, the fertilization behaviour can be influenced. A higher quota rent of organic nitrogen would increase the use of manure. This trade-off behaviour seriously influences effectiveness of policies. When the objective is to lower the total nitrogen use, a mere reduction of organic quota can partially be counteracted by a higher inorganic nitrogen use. When the objective is to better spread the manure, increasing the quota rent for deficit farms will increase their acceptance of manure.manure abatement, nutrient emission rights, Tobit model, Crop Production/Industries,
Radar-derived Surface Mass Balance at Derwael Ice Rise, Dronning Maud Land, Antarctica
No full textThis dataset provides surface mass balance estimates (also referred to as surface accumulation rates) derived from shallow radar stratigraphy of Derwael Ice Rise located in Dronning Maud Land, Antarctica. The underlying assumption is that the radar-detected stratigraphy is isochronal-representing former snow surfaces that have been buried since deposition. By correlating these isochrones with a dated firn core, an age can be assigned to each layer. Combined with a density-depth profile, also obtained from the firn core, this allows the estimation of the temporally averaged surface mass balance rate. This rate varies spatially with the depth of the isochrone. In this case, the surface mass balance estimates represent an average over the 21 years preceding 2012 CE. Spatial variation in accumulation is among others influenced by orographic effects induced by the topography of the ice rise. These data have been used as forcing for a model predicting patterns in the deeper radar stratigraphy, but they can also be used, e.g., to investigate the dependency of surface mass balance on surface slope and weather patterns in general
Les Alpes du Sud: Trajectoires d'un espace en transitions
No full textInternational audienceCet ouvrage propose un éclairage interdisciplinaire sur les grands enjeux environnementaux et socio-économiques des Alpes du Sud. Il s’adresse aux scientifiques et aux acteurs territoriaux qui font face aux crises environnementales et sanitaires.Montagnes et méditerranéennes tout à la fois, les Alpes du Sud ont des airs d’entre-deux territorial. De cet entre-deux, elles ont tiré leur identité. Frontière poreuse, espace refuge tout autant qu’à risque, tour à tour trop vide ou trop plein, ce territoire a su s’adapter, se renouveler face aux aléas socio-environnementaux des siècles passés. Qu’en est-il aujourd’hui face aux crises environnementales et sanitaires qui amènent nos sociétés contemporaines à s’interroger sur leurs fondements socio-économiques et culturels?? Comment les Alpes du Sud répondent-elles aux impératifs de transition?? Les Alpes du Sud sont aussi un entre-deux académique, loin des grandes villes universitaires. Pourtant, grâce au soutien des collectivités territoriales, elles accueillent de longue date des activités scientifiques et pédagogiques qui scrutent les dynamiques socio-environnementales de ce territoire, aujourd’hui réunies aux seins des pôles universitaires de Gap et de Digne rattachés à Aix-Marseille Université. Cet ouvrage collectif réunit l’expertise d’universitaires, d’experts, d’acteurs sociopolitiques impliqués de longue date dans la recherche, l’enseignement et l’action au service du développement durable des Alpes du Sud. Ils associent ici leurs analyses et leurs expériences pour proposer un état des lieux interdisciplinaire des grands enjeux socio-environnementaux de ce territoire singulier
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