HAL - Normandie Université
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L’entr’aide dans la cité du Moyen Âge : l’anarchisme de Kropotkine face à l’historiographie de la Belle Époque
No full textInternational audienceCet article traite de la manière dont Kropotkine place sa recherche au regard des connaissances à sa disposition sur les villes médiévales françaises. Il commence par évoquer les sources dont fait usage l’auteur pour traiter des villes médiévales avant de poursuivre sur la vision libertaire de ces villes qu’il détaille dans son œuvre. La dernière partie confronte cette vision avec celles des non-libertaires de l’historiographie urbaine médiévale du XIXe siècle
Understanding success factors of Class B enterprises in Chile: a pioneering study on socially and environmentally responsible entrepreneurship
No full textInternational audienceInnovative entrepreneurship drives economic and societal progress by introducing novel products, services, and business models. Class B enterprises stand out for harmonising profitability with exceptional social and environmental performance, yet their success factors remain underexplored. This study examines the success factors of Class B enterprises in Chile across five strategic dimensions. Using a descriptive and empirical approach, in-depth surveys were conducted with 34 of the 74 registered Class B companies in Chile. Statistical analysis revealed critical success factors shaping their performance, including the entrepreneurial ecosystem, access to clients, education quality, and support networks. Notably, 81% of entrepreneurs highlighted the ecosystem as pivotal. These findings provide valuable insights into the operational dynamics of Class B enterprises, underscoring the importance of external influences. This pioneering study enriches the literature by offering a comprehensive analysis of success factors in socially and environmentally responsible entrepreneurship in Chile and Latin America
On a brain tumor growth model with lactate metabolism, viscoelastic effects, and tissue damage
No full textInternational audienceIn this paper, we study a nonlinearly coupled initial-boundary value problem describing the evolution of brain tumor growth, including lactate metabolism. In our modeling approach, we also take into account the viscoelastic properties of the tissues as well as the reversible damage effects that could occur, possibly caused by surgery. After introducing the PDE system, coupling a Fischer-Kolmogorov type equation for the tumor phase with a reaction-diffusion equation for the lactate, a quasi-static momentum balance with nonlinear elasticity and viscosity matrices, and a nonlinear differential inclusion for the damage, we prove the existence of global in time weak solutions under reasonable assumptions on the involved functions and data. Strengthening these assumptions, we subsequently prove further regularity properties of the solutions as well as their continuous dependence with respect to the data, entailing the well-posedness of the Cauchy problem associated with the nonlinear PDE system
Strongly interacting matter in extreme magnetic fields
No full textInternational audienceMagnetic fields are ubiquitous across different physical systems of current interest; from the early Universe, compact astrophysical objects and heavy-ion collisions to condensed matter systems. A proper treatment of the effects produced by magnetic fields during the dynamical evolution of these systems, can help to understand observables that otherwise show a puzzling behavior. Furthermore, when these fields are comparable to or stronger than Λ_QCD, they serve as excellent probes to help elucidate the physics of strongly interacting matter under extreme conditions of temperature and density. In this work we provide a comprehensive review of recent developments on the description of QED and QCD systems where magnetic field driven effects are important. These include the modification of meson static properties such as masses and form factors, the chiral magnetic effect, the description of anomalous transport coefficients, superconductivity in extreme magnetic fields, the properties of neutron stars, the evolution of heavy-ion collisions, as well as effects on the QCD phase diagram. We describe recent theory and phenomenological developments using effective models as well as LQCD methods. The work represents a state-of-the-art review of the field, motivated by presentations and discussions during the "Workshop on Strongly Interacting Matter in Strong Electromagnetic Fields" that took place in the European Centre for Theoretical Studies in Nuclear Physics and Related Areas (ECT*) in the city of Trento, Italy, September 25-29, 2023
L’enfer du tour d’échelle en droit des biens : rétrospectives et perspectives
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Exploration of UHS scalability by SPS approach: Multiphysics simulation, critical dimensions, mechanisms and properties
No full textInternational audienceUltrafast High-Temperature Sintering (UHS) enables near-instantaneous densification of ceramics but is limited by part size, wall thickness, and cracking due to thermal inhomogeneities. This work introduces a scalable UHS approach using a modified Spark Plasma Sintering (SPS) chamber with a large working volume (∼113 cm3) and precise control, enabling the sintering of complex ceramic parts up to 30 mm. Direct Ink Writing (DIW) is employed to shape and debind components efficiently while preserving UHS advantages. A parametric study identifies optimal heating rates and critical wall thicknesses (≤1 mm) to minimize thermal stress. Finite element simulations link thermal gradients to stress development, offering predictive capability for complex geometries. The results reveal that organic binder decomposition strongly affects grain growth and residual porosity under ultrafast heating. This work demonstrates the feasibility of industrially scalable UHS and provides key insights for microstructure control and simulation-guided process design
