HAL Université de Toulouse, et Toulouse INP
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Critical BKT dynamics in the archetypal 2D spin system BaCuSiOCl
No full textWe study the spin dynamics in the quasi-2D spin- dimer compound BaCuSiOCl, which exhibits a magnetic field-induced Bose-Einstein condensate (BEC) of triplons. Using nuclear magnetic resonance (NMR) spin-lattice relaxation rate () measurements combined with large-scale quantum Monte Carlo (QMC) simulations, we investigate critical fluctuations across the field-temperature phase diagram. Bridging the behavior observed in 1D and 3D systems, the relaxation rate shows a pronounced peak extending well above the Néel temperature , indicating strong two-dimensional Berezinskii-Kosterlitz-Thouless (BKT)-type fluctuations. A quantitative match between experimental and theoretical BEC phase boundaries validates an effective XXZ model. The study determines the intrinsic BKT transition temperature from QMC, revealing a nearly field-independent . Scaling analysis of the relaxation rate shows critical exponents consistent with 2D universality, and a narrow temperature window is identified where 2D physics dominates. These findings establish BaCuSiOCl as a model system for exploring BKT dynamics in quantum magnets
An Epistemic Theory of Deductive Arguments
No full textInternational audienceEpistemic logic and the theory of argumentation have only very recently started to interact, despite the central role that the epistemic view of argument plays in contemporary epistemology. In this paper, we present a novel epistemic language for reasoning about three types of beliefs of agents: explicit belief, plain implicit belief, and focused implicit belief. We use it to represent the concept of deductive argument and to elucidate its connection with the concept of belief. Our language is interpreted through a formal semantics that relies on belief bases. This semantics allows us to naturally represent the reasons an agent has for believing something, which we show to be closely related to the notion of argument. We provide results on expressiveness, axiomatization and decidability for the language
Reversible phenomena within Low Temperature PEM fuel cells: state of the art, feedback, reflections and suggestions
No full textInternational audienc
Pourquoi collecter et déposer les archives du Toulouse Olympique XIII ? Un projet en construction de sauvegarde de la mémoire d’un club de rugby
No full textInternational audienceSince 2017, a project has been underway to collect, identify, and enhance the archives of Toulouse Olympique XIII, with the aim of preserving the collective memory of rugby league—a sport long marginalized, whose documentary heritage remains fragile and scattered. This initiative is part of a broader national movement to safeguard sports archives, but it faces specific challenges : the scarcity of sources, the fragmentation of holders of objects and documents, and the often approximate reconstruction of memory narratives. This article outlines the approach taken, the methodology adopted, the difficulties encountered, and the prospects opened up for the creation of a sustainable archive collection, serving the transmission of local sporting heritage.Depuis 2017, un projet de collecte, d’identification et de valorisation des archives du Toulouse Olympique XIII a été lancé, dans l’objectif de préserver la mémoire collective du rugby à XIII, sport longtemps marginalisé et dont le patrimoine documentaire reste fragile et dispersé. Cette démarche s’inscrit dans une dynamique nationale de sauvegarde des archives sportives, mais se confronte à des réalités spécifiques : rareté des sources, fragmentation des détenteurs d’objets et de documents, et reconstruction parfois approximative des récits mémoriels. Cet article présente la démarche mise en œuvre, la méthodologie adoptée, les difficultés rencontrées et les perspectives ouvertes pour la constitution d’un fonds d’archives pérenne, en faveur de la transmission du patrimoine sportif local
Mechanical performance of key components in floating photovoltaic systems: technological advances and application prospects
No full textInternational audienceFloating photovoltaic (FPV) technology is emerging as a highly promising approach to accelerate decarbonization of the global economy, due to its higher power generation efficiency and lower land occupation. With the rapid development of FPV technology, the mechanical performance degradation of key components caused by the harsh marine environment has become a pressing issue, as it significantly contributes to failure behavior observed in FPV systems. A comprehensive compilation of the mechanical performance of key components in FPV systems is also currently unavailable. Here, the mechanical behavior of each structural component in FPV systems under harsh marine environments is systematically reviewed. It further emphasizes the synergistic effects of mechanical performance degradation among different components on the overall system. The drop-off rate (v) of normalized elongation at break (EAB) of polymer under the synergistic effect of various environmental factors increases from 7.5 × 10−4 h−1 to 21.8 × 10−4 h−1 compared with the single environmental stress. Moreover, the development of novel materials and innovative mechanical structures applied in FPV systems to enhance mechanical performance is discussed. The novel flexible PV modules applied in FPV systems minimize the loads acting on the mooring lines by 80% and increase power generation by 5%. Notably, this paper provides a theoretical foundation for developing standards of FPV systems, especially the establishment of standards related to the synergistic effects of the mechanical performance degradation of different key components on FPV systems
Rôle de Neospora caninum lors de troubles de la reproduction chez la chienne : investigation sero-épidémiologique et facteurs de risque
No full textInternational audienc
Invadosomes as “shape-shifters” of cellular maturation: insights from megakaryocytes
No full textInternational audienceInvadosomes are a family of subcellular actin-based structures essential for cell–extracellular matrix (ECM) interaction and remodeling. In non-invasive cells, they are referred to as podosomes, which enable adhesion, migration, and ECM remodeling via secretion of metalloproteinases or mechano-traction. In invasive tumoral cells, these structures are called invadopodia due to their function. Despite structural similarity, podosomes appear as highly regular dots in 2D and do not always exhibit ECM-degradative abilities; hence, the term “degradative dot-podosomes” is used in this paper. Invadopodia are consistently degradative, fewer in number, slightly larger, deeper, less regular-shaped, and longer-lived. In tumor cells, collagen I induces the formation of linear invadosomes, which promote invasion by degrading collagen through the action of MT1–MMP ( membrane type 1 – matrix metalloproteinase ) and the adaptor protein Tks5 ( tyrosine kinase substrate 5 ). Interestingly, linear invadosomes also appear in non-tumor cells, such as megakaryocytes (MKs)—the platelet precursors—which display podosomes that closely resemble invadopodia. As MKs mature, Tks5 expression decreases, and dot-podosomes align along collagen I fibers, fusing into linear podosomes that remodel the ECM through mechanical traction but have lost their degradative ability. The GTPase Cdc42, crucial for invadosome formation, remains highly active in the MK internal demarcation membrane system (DMS) but is downregulated in linear podosomes. These observations suggest that Tks5, considered a marker of metastatic potential, also plays roles in normal physiology. Thus, linear podosomes with mechanotransductive properties may exist in a broader range of non-transformed cells. This mini-review focuses on the linear subfamily of invadosomes, highlighting their structure and function in MKs, a model in which invadosomes remain underexplored
Assessing Mesoscale Heterogeneities in Hard Carbon Electrodes through FIB-SEM Characterization, Manufacturing and Electrochemical Modeling
No full textInternational audienceGiven the recent inclusion of sodium-ion batteries (SIBs) in the energy market, the optimization of their performance becomes a relevant research topic. At the electrode-level, the parameters selected during its manufacturing process influence its microstructure and, consequently, its electrochemical performance. Here, we address different manufacturing conditions of hard carbon (HC) negative electrodes by varying the solid content (35 wt% and 40 wt%) and the calendering degree (uncalendered and 30% calendered). The three-dimensional microstructure of each sample is acquired using focused ion beam (FIB) and scanning electron microscopy (SEM) technique, from which the real-shape of HC particles is extracted and used to generate input microstructures for a discrete element method (DEM) calendering model designed to address the mechanical electrode behavior and its effects on current collector deformation. Also, the 3D electrode microstructures are used in a finite element method (FEM) model to obtain the electrochemical performance for C-rates ranging from C/50 to C/5 and to compare these results with experimental ones. Furthermore, the DEM predictions are injected into the FEM model to validate them against the FIB-SEM reference. Overall, we study how manufacturing parameters influence the performance of HC electrodes, providing an important guideline for optimizing their production for SIBs applications. Preprint on ChemRxiv, 45 pages
114. Population pharmacokinetic modelling of different sulphonamides associated with trimethoprim in pigs
No full textInternational audienceSulphonamides (S), one of the first bacteriostatic antibiotics developed, are widely prescribed in combination with trimethoprim (TMP) to treat various bacterial infections in pig farming. Currently, the 1:5 dose ratio of TMP:S used for pigs is a direct transposition of the ratio of TMP:sulphamethoxazole (SMX) determined decades ago for humans, in an attempt to obtain a supposed synergistic plasma concentration ratio of 1:19. However, major pharmacokinetic (PK) differences exist between humans and animals, and depend on the type of sulphonamide used. Here, we generated new PK data for pigs after three independent cross-over designs with intravenous and oral administrations of the main sulphonamides used in pig farming (i.e., sulphadimethoxine, sulphadiazine and SMX) combined with TMP. We analysed the data using a population pharmacokinetic modelling approach. The results indicated that the three sulphonamides and TMP have different elimination half-lives that result in a plasma concentration ratio that differs from 1:19 and changes over time
MACS-KG: MAnufacturing CommonSense Knowledge Graph
No full textInternational audienceManufacturers often struggle to determine the appropriate processes, machines, and procedures when developing a new product, especially without extensive technical expertise. While knowledge graphs (KGs) help structure and access domain-specific information, existing solutions lack commonsense reasoning to support intuitive and explainable decision-making. This demo presents MACS-KG, a KG designed to assist manufacturers in identifying the right manufacturing processes for a product, selecting suitable machines, and following standardized procedures. By integrating Manufacturing Commonsense Knowledge (MCSK) rules, MACS-KG enables reasoning and explainable decision-making, ensuring that manufacturers access relevant information and understand the rationale behind each recommendation derived using MCSK