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A Bent Ga(III)/Ln(III) 12-MC-4 Featuring Interchangeable Guest Ligands
No full textInternational audienc
Un dialogue qui ne dit pas son nom ? Formes, usages et limites du dialogue professionnel en PME
No full textde La Rochefoucauld, M., Chader, A. (2025). La Régulation Interne de L'usage de L'intelligence Artificielle Générative En Entreprise : Cas D'orange. Innovations, Pub. anticipées(0), I190-XXXII.International audienceÀ l’heure où les organisations sont invitées à « ouvrir des espaces de discussion sur le travail », le dialogue professionnel suscite un intérêt croissant en tant que levier de régulation, de reconnaissance et d’adaptation. Pourtant, ce concept demeure peu stabilisé scientifiquement, notamment dans les PME où les pratiques sont largement informelles. Cet article s’appuie sur une étude qualitative menée auprès de 11 PME françaises, au travers de 44 entretiens semi-directifs croisant les regards de quatre profils d’acteurs (salariés, managers, représentants du personnel, direction). L’objectif est de mieux comprendre comment le dialogue professionnel est défini, mis en œuvre et perçu dans les pratiques organisationnelles, et comment il s’articule – ou entre en tension – avec le dialogue social. Les résultats mettent en évidence une pluralité de représentations, une prédominance des formes informelles, et un besoin de structuration lisible. Le dialogue professionnel apparaît à la fois comme ressource de management, espace d’expression ou tentative d’innovation sociale, mais aussi comme un objet ambivalent dont la légitimité dépend de sa reconnaissance et de son articulation avec les formes de représentation collective
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
Dictionary and society: Contrastive study of Chinese, English and French (meta)lexicographic traditions
No full textInternational audienceThe dictionary, as a cultural and social object, has garnered increasing attention for its significance as a distinct subject of study. These essential works capture various facets of political, cultural, economic, and social life, reflecting ongoing progress (Gouws 2020; Pruvost 2021; Yong & Peng 2022, etc.). This intersection between dictionaries and society is referred to as sociolexicography (Busse 2002) and is defined as ‘the study of how social processes influence the content and structure of dictionaries’. This line of inquiry also falls under metalexicography (Zgusta 1971; Quemada 1968; Pruvost 2021; Gouws 2020; De Schryver 2023, etc.).While scholars from both Western and Eastern traditions have explored the history of dictionaries in their respective countries, few studies adopt a contrastive perspective. This paper offers a diachronic analysis of traditional dictionaries in three different languages: English (Indo-European family), French (inflectional and derivational type), and Chinese (Sino-Tibetan family, isolating or analytic structure), and their traditional metalexicographic cultures. We trace the evolution of these dictionaries through three distinct periods: prior to their inception (pre-16th century), the era of early dictionaries (16th-19th centuries), and the advent of modern dictionaries (20th century onward). This comparison highlights the significant relationship between dictionaries and the societies in which they were created
A comprehensive experimental and kinetic modeling study of flame speed and ignition delay time in n-hexane-based mixtures
No full textInternational audienceIn the present study, laminar burning velocities of n-hexane/air mixture were investigated at equivalence ratios of 0.75-1.6, initial temperatures of 295-380 K and initial pressures of 40-100 kPa using two constant-volume chambers. Ignition delay times of stoichiometric n-hexane/O 2 /N 2 /Ar were measured in a shock tube at 1.2/2.0 MPa over 1150 to 1450 K. Based on existing literature on n-hexane oxidation and measurements from the current study, a database for n-hexane-based mixtures was established. The predictive performances of four chemical mechanisms were evaluated. The overall performance of Caltech mechanism is better for reproducing flame speed profiles, especially for rich n-hexane/air mixtures. LLNL mechanism predicts the ignition delay time well in the high-temperature range. Local and global sensitivity analyses at aircraft flight relevant conditions were performed. The laminar burning velocity is sensitive to R1: H+O 2 =OH+O and R30: CO+OH=CO 2 +H, and to the reactions involved in HCO formation/consumption. Ignition delay time is sensitive to reactions that contribute to OH radical formation before auto-ignition occurrence. Global sensitivity analyses were performed on laminar flame simulations and compared with the results of local sensitivity analyses. The global sensitivity analyses indicate limited/important reaction interactions under flame/ignition conditions
Combining the second data release of the European Pulsar Timing Array with low-frequency pulsar data
No full textInternational audienceLow-frequency radio data improve the sensitivity of pulsar timing arrays (PTAs) to propagation effects such as dispersion measure (DM) variations, enabling better noise characterization essential for detecting the stochastic gravitational wave background (GWB). We combined LOFAR (100-200 MHz) and NenuFAR (30-90 MHz) observations with the recent European and Indian PTA release (DR2new+) into a new dataset, DR2low, spanning ~11 years for 12 pulsars. DR2low allows updated noise models, increasing PTA sensitivity to the GWB. Using Libstempo and Enterprise, we applied standard noise models including red noise (RN) and time-variable DM (DMv) as power laws, and performed Bayesian model selection over RN, DMv, and an additional chromatic noise term (CN4). Compared to DR2new+, DR2low improves DM constraints and separates DM and RN contributions. We found that the RN is required in the final model for 10 out of 12 pulsars, compared to only 5 in the DR2new+ dataset. The improved sensitivity to plasma effects provided by DR2low also favors the identification of significant CN4 in eight pulsars, while none showed such evidence in DR2new+. The analysis also reveals unmodelled solar wind effects, particularly near solar conjunction, with residual delays absorbed into the DM component, highlighting the importance of accurately modelling the solar wind in PTA datasets
Iron Metallurgy in Ancient Cambodia: Production Dynamics, Traditions and Chronologies in a Southeast Asian Context (9th–14th centuries CE)
No full textInternational audienceCollaborative studies in iron archaeometallurgy in Cambodia over the past decade, particularly through the IRANGKOR project, have advanced our understanding of iron production dynamics during the Angkorian period (9th–15th centuries CE). This research examines metallurgical remains and artifacts within a systemic framework, linking them to production sites, geological contexts, and usage settings, such as iron clamps in monumental constructions. Studied diachronically and across multiple spatial scales, these remains provide insights into production practices and “recipes,” production dynamics, and the circulation and supply of iron, particularly within the central production territory of Phnom Dek, historically recognized for its metallurgical tradition.The study explores the relationships between resources, production processes, metallurgical practices, and iron circulation. Central to the research is the use of provenance analyses, direct dating of the metal itself, and the examination of comparative patterns, providing precise chronological and spatial benchmarks. Combining historical and archaeological sources with material analysis of artifacts and smelting debris establishes a framework for interpreting these dynamics across the Angkorian territory.The resulting datasets reveal changes in metallurgical “recipes” as well as in supply strategies and demands over more than 1,400 years. This presentation synthesizes recent results, highlighting the contribution of compositional and chronological data to frameworks for understanding continuities and changes in ancient metallurgical practices. Situating these findings within a broader Asian context highlights similarities in practices and recipes and their implications for regional technical dynamics
