21 research outputs found

    The non-equivariant coherent-constructible correspondence and a conjecture of King

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    The coherent-constructible (CC) correspondence is a relationship between coherent sheaves on a toric variety X and constructible sheaves on a real torus mathbbTmathbb {T}T. This was discovered by Bondal and established in the equivariant setting by Fang, Liu, Treumann, and Zaslow. In this paper, we explore various aspects of the non-equivariant CC correspondence. Also, we use the non-equivariant CC correspondence to prove the existence of tilting complexes in the derived categories of toric orbifolds satisfying certain combinatorial conditions. This has applications to a conjecture of King

    Communs en crise : Agdals, terres collectives, forĂŞts et terroirs au Maroc

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    International audienceThrough economic and geographical cross-disciplinary approaches based on case studies illustrating the current endogenous and exogenous transformations of the use of common resources in Morocco, the aim of this article is to question the evolution of the notion of commons. Is it still relevant to refer to commons when rural communities have frequently lost the power to govern local natural common-pool resources, such as agricultural water, grasslands, or certain types of forests, to the benefit of the state or the private sector? We question the current role of national public authorities who have supported the rise of a production-driven organization, particularly in the context of the “Green Morocco Plan.” Thus, the preservation of natural resources, collective management systems, and traditional expertise have too often been neglected.À travers les regards croisés de l’économie et de la géographie, et sur la base de plusieurs études de cas démonstratives des transformations en cours au Maroc des usages des ressources communautaires, à la fois endogènes et en lien avec des impulsions extérieures, l’objectif de cet article est d’interroger l’évolution de la notion de communs dans un contexte de crise de ces derniers. Est-il encore possible de parler de communs dans des situations où les communautés rurales se trouvent le plus souvent dessaisies, au profit de l’État et du secteur privé, des prérogatives qui étaient les leurs en matière de gouvernance locale de ressources collectives telles que l’eau agricole, les pâturages ou certaines forêts ? Cette réflexion nous amène à interroger le rôle actuel des pouvoirs publics marocains, notamment dans le cadre du Plan Maroc Vert, qui appuient l’émergence d’un mode d’organisation à vocation productiviste, négligeant trop souvent la préservation des ressources naturelles, des systèmes de gestion et des savoir-faire traditionnels collectifs

    GEOFCAN : actes du 2ème colloque de géophysique des sols et des formations superficielles : résumés étendus

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    A geophysical survey has been conducted in Siem Reap province of Cambodia. The aim was to test DC, TDEM and PMR methods to improve the borehole success rate. The preliminary results lead to the proposition of an implementation methodology which can be described as follows : 1) to use direct current methods (1D and 2D) in any case, as standard methods ; 2) to use jointly PMR, DC and TDEM methods, when the borehole success rate is less than 30% ; 3) to use jointly direct current and TDEM methods, when the success rate ranges 30 to 50% ; 4) to use electrical well logging (normal probes) to implement the borehole screens. (Résumé d'auteur
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