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Numérique et apprentissages : des décalages de perceptions entre élèves et enseignants
No full textInternational audienceDigital technologies and learning: Gaps between students’ and teachers’ perceptions . “Twictée” aims to develop the spelling skills of primary and secondary school students through the exchange, between distant classes, of dictated sentences and justified corrections, using Twitter. This paper questions the convergences and divergences in the perceptions of digital technology held by teachers and students participating in this pedagogical scenario. Through the thematic content analysis of three series of interviews with 19 grade 4 to 6 teachers and two series of interviews with 45 of their students (in five classes), we find discrepancies in representations of digital technology and difficulties, for most students, but especially for the ones with difficulties, in conceiving what is asked of them.« Twictée » vise à développer les compétences orthographiques des élèves de l’école et du collège, grâce à l’échange, entre classes distantes, de phrases dictées et de corrections justifiées, au moyen du réseau Twitter. Cet article interroge les convergences et divergences de perceptions du numérique qu’ont des enseignants et des élèves participant à ce dispositif. Par l’analyse de contenu thématique de trois séries d’entretiens de 19 enseignants de cycle 3 et de deux séries d’entretiens de 45 de leurs élèves (dans cinq classes), nous constatons des écarts de représentations à propos du numérique et des difficultés, pour la plupart des élèves, mais surtout pour les plus faibles, à concevoir ce qui leur est demandé
Comment on the paper "Experimental investigation of the Ni–V–W ternary phase diagram", Calphad: Comput. Coupling Phase Diagrams Thermochem. 76 (2022) 102384
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Familier mais problématique, le tableau de numération
No full textInternational audienceLe tableau de numération semble être un support pédagogique usuel à l’école primaire, à tous les niveaux d’enseignement. La recherche en fait rarement un objet d’étude à part entière. Nous interrogeons dans ce texte la place et le rôle qu’a et que pourrait avoir le tableau de numération pour l’apprentissage de la compréhension de l’écriture chiffrée à l’école primaire. Pour cela nous avons enquêté sur les usages du tableau dans l’enseignement à partir de quelques manuels et en recueillant des éléments de pratiques déclarées à partir d’un questionnaire proposé à des enseignants. Ce travail a été complété par une recherche de traces de tableau de numération dans l’histoire des nombres et de ses usages, en nous appuyant sur quelques travaux d’historiens et d’épistémologues. Ceci nous amène à dégager des potentialités didactiques du tableau de numération, et à proposer des pistes pour en renouveler les formes et les usages
Algebraic two-level measure trees
No full textWith the algebraic trees, Löhr and Winter (2021) introduced a generalization of the notion of graph-theoretic trees to account for potentially uncountable structures. The tree structure is given by the map which assigns to each triple of points their branch point. No edge length or distance is considered. One can equip a tree with a natural topology and a probability measure on the Borel-σ-field, defining in this way an algebraic measure tree. The main result of Löhr and Winter is to provide with the sample shape convergence a compact topology on the space of binary algebraic measure trees. This was proved by encoding the latter with triangulations of the circle. In the present paper, we extend this result to a two level setup. Motivated by the study of hierarchical systems with two levels in biology, such as host-parasite populations, we equip algebraic trees with a probability measure on the set of probability measures. To show the compactness of the space of binary algebraic two-level measure trees, we enrich the encoding of these trees by triangulations of the circle, by adding a two-level measure on the circle line. As an application, we define the two-level algebraic Kingman tree, that is the random algebraic two-level measure tree obtained from the nested Kingman coalescent
On the Cauchy problem for the Hartree approximation in quantum dynamics
No full text25 pagesWe prove existence and uniqueness results for the time-dependent Hartree approximation arising in quantum dynamics. The Hartree equations of motion form a coupled system of nonlinear Schrödinger equations for the evolution of product state approximations. They are a prominent example for dimension reduction in the context of the the time-dependent Dirac-Frenkel variational principle. We handle the case of Coulomb potentials thanks to Strichartz estimates. Our main result addresses a general setting where the nonlinear coupling cannot be considered as a perturbation. The proof uses a recursive construction that is inspired by the standard approach for the Cauchy problem associated to symmetric quasilinear hyperbolic equations
Correction: Gasperi et al. Micropollutants in Urban Runoff from Traffic Areas: Target and Non-Target Screening on Four Contrasted Sites. Water 2022, 14, 394
No full textInternational audienceIn the original publication [...
Combiner jeu de rôle coopératif et simulation numérique des comportements de protection dans les exercices de gestion de crise inondation
No full textInternational audienceDans le cadre du projet Européen ANYWHERE1, un groupe interdisciplinaire de chercheurs appuyés d’acteurs opérationnels (protection civile, gestionnaires du risque, prévisionnistes) ont développé le jeu de rôle ANYCaRE permettant de simuler une cellule de gestion de crise chargée de prendre des décisions de mise en sécurité des populations face à l’occurrence d’épisodes météo-climatiques extrêmes
La méthode des itinéraires photographiques : une ethnographie visuelle des mondes ouvriers de la logistique
No full textInternational audienceThis article presents the approach set up in the framework of a collective research programme on the "social worlds of logistics blue collars", carried out on four French and German sites between 2016 and 2019. One of the aim was to turn fieldwork into a source of knowledge and creation. Based on the photographic itinerary method, as formalised by sociologist Jean-Yves Petiteau in the course of several research projects, a framework for collaboration between researchers, photographers and respondents has been constructed, in order to document and analyse a social world, while representing it to a wider audience.Cet article présente la démarche mise en place dans le cadre d’un programme de recherche collectif sur les « mondes ouvriers de la logistique », mené sur quatre terrains français et allemands entre 2016 et 2019. L’objectif de cette démarche était, entre autres, de faire de l’enquête une source de connaissance et de création. A partir de la méthode des itinéraires photographiques, telle que l’a formalisée le sociologue Jean-Yves Petiteau au fil de plusieurs recherches, un cadre de collaboration entre chercheur·euses, photographes et enquêté·es a été construit, afin de documenter et d’analyser un univers social tout en le représentant auprès d’un public plus large
Comparative acceptability of therapeutic maintenance regimens in patients with inflammatory bowel disease: results from the nationwide ACCEPT2 Study.
No full textOnline ahead of printInternational audienceBACKGROUND: Owing to growing number of therapeutic options with similar efficacy and safety, we compared the acceptability of therapeutic maintenance regimens in inflammatory bowel disease (IBD). METHODS: From a nationwide study (24 public or private centers), IBD patients were consecutively included for 6 weeks. A dedicated questionnaire including acceptability numerical scales (ANS) ranging from 0 to 10 (highest acceptability) was administered to both patients and related physicians.RESULTS: Among 1850 included patients (65.9% with Crohn's disease), the ANS were 8.68 ± 2.52 for oral route (first choice in 65.8%), 7.67 ± 2.94 for subcutaneous injections (first choice in 21.4%), and 6.79 ± 3.31 for intravenous infusions (first choice in 12.8%; P < .001 for each comparison). In biologic-na\"ive patients (n = 315), the most accepted maintenance regimens were oral intake once (ANS = 8.8 ± 2.2) or twice (ANS = 6.9 ± 3.4) daily and subcutaneous injections every 12 or 8 weeks (ANS = 7.9 ± 3.0 and ANS = 7.2 ± 3.2, respectively). Among 342 patients with prior exposure to subcutaneous biologics, the preferred regimens were subcutaneous injections (≥q2 week-intervals; ANS between 9.1 ± 2.3 and 8.1 ± 2.7) and oral intake once daily (ANS = 7.7 ± 3.2); although it was subcutaneous injections every 12 or 8 weeks (ANS = 8.4 ± 3.0 and ANS = 8.1 ± 3.0, respectively) and oral intake once daily (ANS = 7.6 ± 3.1) in case of prior exposure to intravenous biologics (n = 1181). The impact of usual therapeutic escalation or de-escalation was mild (effect size <0.5). From patients' acceptability perspective, superiority and noninferiority cutoff values should be 15% and 5%, respectively. CONCLUSIONS: Although oral intake is overall preferred, acceptability is highly impacted by the rhythm of administration and prior medication exposures. However, SC treatment with long intervals between 2 injections (≥q8 weeks) and oral intake once daily seems to be the most accepted modalities