HAL Portal UPPA (University of Pau and the Pays de l'Adour)
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Confidentialité d'informations concernant les dirigeants sociaux au RCS
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Le pic du Midi et son observationproposition d'inscription sur la Liste du patrimoine mondial: Résumé analytique - Executive Summary
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L'approvisionnement de l 'échansonnerie de Marguerite d'Angoulême, reine de Navarre, en vins ligériens et guyennais dans les années 1530 et 1540
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Doubly nonlinear parabolic equation involving a mixed local-nonlocal operator and a convection term
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Adaptive and Sustainable Smart Environments Using Predictive Reasoning and Context-Aware Reinforcement Learning
No full textInternational audienceSmart environments play a key role in improving user comfort, energy efficiency, and sustainability through intelligent automation. Nevertheless, real-world deployments still face major challenges, including network instability, delayed responsiveness, inconsistent AI decisions, and limited adaptability under dynamic conditions. Many existing approaches lack advanced context-awareness, effective multi-agent coordination, and scalable learning, leading to high computational cost and reduced reliability. To address these limitations, this paper proposes MACxRL, a lightweight Multi-Agent Context-Aware Reinforcement Learning framework for autonomous smart-environment control. The system adopts a three-tier architecture consisting of real-time context acquisition, lightweight prediction, and centralized RL-based decision learning. Local agents act quickly at the edge using rule-based reasoning, while a shared CxRL engine refines actions for global coordination, combining fast responsiveness with continuous adaptive learning. Experiments show that MACxRL reduces energy consumption by 45–60%, converges faster, and achieves more stable performance than standard and deep RL baselines. Future work will explore self-adaptive reward tuning and extend deployment to multi-room environments toward practical real-world realization
A novel test protocol for assessing accelerated salt weathering effects onconstruction materials and natural rocks
No full textInternational audienceSalt weathering poses significant challenges to the durability and integrity of construction materials across various engineering applications. This study introduces a novel accelerated salt weathering protocol designed for standardised laboratory testing, aimed at evaluating the effects of salt crystallisation on natural rocks and construction materials. The protocol was validated using three distinct materials: Flysch rocks, Vosges sandstone, and high-performance concrete. The core protocol features continuous partial immersion of cylindrical-shaped samples in a 3 molal sodium sulphate solution at 32 ◦C. At the same time, room temperature is maintained at 20 ◦C, providing well-defined boundary conditions for easy reproducibility and potential numerical modelling. Non-destructive monitoring techniques, including time-lapse photography coupled with Digital Image Correlation (DIC) and acoustic emission (AE) analysis, were integrated into the core protocol. In addition, postmortem X-ray tomography and optical microscopy were used to characterise salt-induced crack patterns further. The Flysch rock samples exhibited significant external deterioration, with DIC analysis highlighting the influence of material heterogeneity in damage susceptibility. AE analysis captured internal damage progression and identifiedthe onset of salt-induced deterioration in the Vosges sandstone samples, which displayed consistent responses to the weathering test protocol. The concrete samples, pre-cracked by mechanical loading to mimic on-site coastal erosion conditions, exhibited salt-induced crack propagation and development of new salt-induced cracks when tested under the weathering protocol. These findings demonstrate the protocol’s effectiveness in evaluating salt-induced damage in construction materials, providing a reproducible framework that can be readily implemented in diverse testing environments to enhance durability assessment in engineering applications
Faire image pour faire mémoire. Artistes colombiennes face à la violence
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