Classifying Students’ Meta-cognitive Comments

International audienceWe report progress on automatically classifying written commentsthat students provide after receiving their performance on tests.The aim of this classification is to help teachers support the developmentof students’ metacognitive skills more effectively. We describe a classificationpipeline that seamlessly integrates large or small language models(LLMs or SLMs), leveraging state-of-the-art retrieval augmented generation,and human feedback.We apply our approach to field data from highschool physics tests and to a classification scheme derived from a modelfor self-regulated learning. The best classification accuracies achieved forSLMs are of the order of 0.8, which is comparable to what can be obtainedwith LLMs. The classification obtained indicates that students insimilar classroom contexts have very different perceptions and levels ofanalysis of their performance on assessments. While some focus solely onthe factual interpretation of their quantitative results, others commenton their level of confidence, self-efficacy and learning strategies

Augmenting a hypergraph to have a matroid-based ( f , g ) -bounded ( α , β ) -limited packing of rooted hypertrees

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Microstructure optimization by combinatorial approach applied to Duplex Medium Manganese steels

International audienceThis study introduces a novel combinatorial approach for optimizing the microstructure of duplex medium-manganese (Mn) steels by coupling a controlled thermal gradient with in situ high-energy X-ray diffraction (HEXRD) during intercritical annealing. A temperature gradient (680–720 °C) across a single sample enables real-time monitoring of phase transformations over a broad thermal range in one experiment. Compared to isothermal trials, this method offers high-resolution insight into austenite formation kinetics and phase stability, enabling accurate identification of the optimal temperature window for maximizing retained austenite. The results reveal a narrow optimal range (∼700–710 °C) where retained austenite fractions exceed 30 %, surpassing values from traditional methods. Post-mortem Electron Backscatter Diffraction (EBSD) analysis showed the spatial distribution of stabilized austenite, highlighting the complementary roles of in situ and ex situ characterization. This work demonstrates the potential of gradient-based combinatorial metallurgy to accelerate process optimization and support the design of high-performance third-generation advanced high-strength steels

Production de contenus sur Instagram autour d’œuvres des collections muséales : de la tension entre images iconiques et images inédites

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« L’“étrange magnanimité” des artistes qui font don de leurs œuvres : l’exemple de Botticelli et de Lorenzo Costa »

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A new friction model for simulation, estimation and motion control

International audienceThis paper presents a new model of friction forces intended to be used for designing motion controllers and system simulation and estimation. The model is based on physical insights and captures the behavior of friction forces with respect to the slip velocities. Compared with existent models, this model is very simple, requiring a small number of parameters to be tuned. Motivated by the nature of induced forces of friction, the behavior of friction forces has been modeled as a Steinmetz equivalent circuit, which includes particular dissipation terms. Simulated examples illustrate the effectiveness of the model in capturing the behavior of friction forces observed in nature.Cet article présente un nouveau modèle de forces de frottement destiné à être utilisé pour la conception de contrôleurs de mouvement et pour la simulation et l'estimation de systèmes. Le modèle est basé sur des connaissances physiques et capture le comportement des forces de frottement par rapport aux vitesses de glissement. Comparé aux modèles existants, ce modèle est très simple et nécessite peu de paramètres à régler. En particulier, le modèle proposé est écrit en termes de paramètres qui peuvent avoir une signification physique. Motivé par la nature des forces de frottement induites, le comportement des forces de frottement a été modélisé comme un circuit équivalent de Steinmetz, qui inclut des termes de dissipation particuliers. Des exemples simulés illustrent l'efficacité du modèle à capturer le comportement des forces de frottement observées dans la nature

Matroid-reachability-based decomposition into arborescences

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Introduction of New Worlds New Words

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On arborescence packing augmentation in hypergraphs

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Diagnostic stratégique ESG et évaluation financière et extra-financière

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