USURJ: University of Saskatchewan Undergraduate Research Journal
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Le vertige futurologique
No full textInternational audienceAprès une reprise critique de l’histoire de la futurologie comme discipline, ce texte propose plusieurs pistes de recherche pour aborder l’activité spéculative en général et le travail d’anticipation des futurologues en particulier. Il en appelle à la constitution d’une science des vertiges ou vertigologie, et examine les manières les plus courantes de se projeter dans un futur vertigineux, de la fin de l’humanité jusqu’au changement d’échelle
L'outillage des établissements ruraux laténiens et gallo-romains d'Île-de-France. Apports sur la caractérisation des activités agropastorales
No full textInternational audienceThis study, about the Île-de-France, for the Gaulish and Roman period, deals with agro-pastoral tools first of all by activity: preparation of land and ploughing, cultivation of small plots, maintenance of plots, maintenance of trees and harvest, harvesting and haying, breeding equipment. Then, the tools are associated with the plateau and valley areas where they were discovered to open a reflection on their distribution.Réalisée à l’échelle de l’Île-de-France, et pour La Tène C et D et l’époque romaine, cette étude se propose d’aborder l’outillage agropastoral tout d’abord par type d’activité : préparation des terres et labours, culture des petites parcelles, entretien des parcelles, entretien des arbres et récolte, moisson et fenaison, équipements associés à l’élevage. Puis les outils sont associés à l’unité paysagère d’Île-de-France où ils ont été découverts afin d’ouvrir une réflexion sur la présence/absence des objets sur les zones de plateau et de vallée
De la propriété à la possession. Repenser les collections muséales
No full textInternational audienceRemarques à propos du statut des objets au sein des musées et sur la question de leur aliénabilité ou inaliénabilité
Still Present ! 12e Biennale de Berlin
No full textInternational audienceCompte rendu de la Biennale de Berli
“Ole Scheeren : Spaces of Life”
No full textInternational audienceCritique d'une exposition au ZKM de Karlsruh
Convergence, concentration and critical mass phenomena in a chemotaxis model with boundary signal production for eukaryotic cell migration
No full text46 pages, a few minor typos corrected in v2We consider a model of chemotaxis with boundary signal production which describes some aspects of eukaryotic cell migration. Generic polarity markers located in the cell are transported by actin which they help to polymerize. This leads to a problem whose mathematical novelty is the nonlinear and nonlocal destabilizing term in the boundary condition. We provide a detailed study of the qualitative properties of this model, namely local and global existence, convergence and blow-up of solutions. We start with a complete analysis of local existence-uniqueness in Lebesgue spaces. This turns out to be particularly relevant, in view of the mass conservation property and of the existence of Liapunov functionals, also obtained in this paper. With the help of this local theory, we next study the global existence and convergence of solutions. In particular, in the case of quadratic nonlinearity, for any space dimension, we find an explicit, sharp mass threshold for global existence vs.~finite time blow-up of solutions. The proof is delicate, based on the possiblity to control the solution by means of the entropy function via an \eps-regularity type argument. This critical mass phenomenon is somehow reminiscent of the well-known situation for the Keller-Segel system. For nonlinearitities with general power growth, under a suitable smallness condition on the initial data, we show that solutions exist globally and converge exponentially to a constant. As for the possibility of blow-up for large initial data, it turns out to occur only for nonlinearities with quadratic or superquadratic growth, whereas all solutions are shown to be global and bounded in the subquadratic case, thus revealing the existence of a sharp critical exponent for blow-up. Finally, we analyse some aspects of the blow-up asymptotics of solutions in time and space
Jason Schwartz, ou la fiction brisée
No full textInternational audienceJason Schwartz’s two books so far, A German Picturesque (1998) and John the Posthumous (2013), have garnered very little criticism, which is no wonder if, as stated by Ben Marcus in his foreword to A German Picturesque, Schwartz’s fiction “slips from apprehension,” written as it is in “aphasic English cleansed of obvious meaning” (A German Picturesque viii, ix). The overly descriptive nature of the prose might in part account for this, lending the books ekphrastic contours that deprive them of properly narrative contents. Yet, far from making Schwartz’s books more transparent or immediate, this ekphrastic bias rather tends to obfuscate the texts, frustrating the reader’s understanding as soon as the descriptive belies its own pretenses and artificiality. By radicalizing its ekphrastics, Schwartz’s fiction enhances its own materiality, not to say ontology, and eventually foregrounds its brokenness, as it were
