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[en] Corsica's specific characteristics, (in particular the fact that it is not connected to the continental electricity network and its major potential where natural energy sources are concerned) have led to this region diversifying its electrical energy sources. Hydroelectricity represents approximately 25 % of the island's electricity requirements while two fuel fired stations produce 50 % of the demand and a further 20 % is imported from Italy via a DC cable. As a result of its public sector obligations, EDF must apply uniform prices throughout the country, which naturally means that the company generates a large deficit in Corsica. A determined policy in the field of renewable energy sources may help to significantly improve this unusual situation. The objective that the various key players in the energy field have set themselves is to derive 40 % of the total electric production in 2010 from production methods using renewable energy sources. (authors)
[en] Using numerical simulations, we studied several coupled translational and rotational solutions of the two-finite-body problem with one spherical and one triaxial body. The aim was to investigate which types of orbits and planetary bodies could produce spin-induced orbital perturbations relevant enough to add to models dealing with other perturbations. To fully assess the strengths and consequences of this perturbation, we did not include any other perturbation even when a more realistic scenario would have required it. Interesting results concern planet–star mass ratios like a hot Jupiter or a super-Jupiter around a star like the Sun or the red dwarf Proxima Centauri. The short-period chaotic effect of the gravitational spin–orbit perturbation on highly eccentric orbits in the vicinity of the Roche limit can be a prominent feature. It should be taken into account when studying the tidal evolution of such a planet or its interactions with any companion in the neighborhood of the star.
[en] Corsica island has been subjected to an unprecedented abundance of photovoltaic plant projects since its energy policy is focused on renewable resources. Concerned public institutions require specific tools to select the most relevant projects among numerous projects proposed in a transparent and prudent way. To this end, a multicriteria decision aiding method was developed to select among 16 projects that have been proposed on farming fields in Haute Corse. This paper details the main stages in the multicriteria methodology, including criteria and constraint definition, criteria weight set calculations, threshold and concordance level determination and the implementation of the chosen multicriteria model, ELECTRE IS. Thus, considering different points of view (energy, geo-economic, ecological, visual impact, territorial use, financial effect), eight criteria have been defined, one of which is optional. The method applied to the reviewed data allowed building 6 weight sets, while a concordance level of 2/3. Using this method, based on our criteria sets and according to the weights and concordance levels determined by the client, 4 projects were selected among the 16 initial ones, with the robustness of these results being tested through all criteria weight sets and different concordance level applications. - Research highlights: → Outranking multicriteria decision aiding for photovoltaic plants selection on farming fields. → Specificities for non-interconnected insular electrical grids (case of Corsica island, France). → New physical, ecological and economical constraints and criteria (never published). → Construction and presentation of specific evaluation scales for each criterion.