Le Miroir des sots de Nigel de Longchamps

International audienceFirst French translation, with commentary, of Nigel de Longchamps' (Wireker) work, Speculum Stultorum. A poem of 4000 elegiac lines, composed in Latin by this Anglo-Norman monk of the late 12th century, in which he makes, through the tribulations and encounters of the donkey Burnellus, a fierce satire of the papacy and the various religious orders of his time,Cet ouvrage propose la première traduction française, avec commentaires, de l'ouvrage de Nigel de Longchamps (Wireker), Speculum Stultorum. Il s'agit du poème de 4000 vers élégiaques, composé en latin par ce moine anglo-normand de la fin du XIIe siècle, dans lequel il fait, à travers les tribulations et les rencontres de l'âne Burnellus, une satire féroce de la papauté et es différents ordres religieux de son temps

Ecodélégués et professionnels de l'éducation : quel accompagnement à l'engagement éco-citoyen ?

International audienceEn considérant désormais les jeunes comme des acteurs majeurs de nos sociétés et non comme des « citoyens de demain en formation » (Pleyers, 2016), les recherches se penchent de plus en plus sur l’analyse de leurs expériences pour comprendre les enjeux de la citoyenneté (Rouyer et al., 2020). Aussi, diverses conditions ont été identifiées comme favorisant les expériences d’engagement éco-citoyen : se sentir concerné, avoir des connaissances environnementales, comprendre les enjeux globaux, agir au sein d’une communauté, partager des expériences positives (Chawla et Derr, 2012 ; Bader et al., 2014) et agir localement (Morin et al., 2022), dans une visée d’amélioration de l’environnement (Bois et al., 2021 ; Lange et Barthes, 2021). Nous nous intéressons plus particulièrement aux expériences vécues en milieu scolaire, lieu où l’adolescent passe le plus clair de son temps. Quel sens les élèves donnent-ils à leurs rôles et à leurs expériences dans les dispositifs ; quelle place est accordée aux élèves 

Minimal tori in R^4

We describe tools for the study of minimal surfaces in R^4; some are classical (the Gauss maps) and some are newer (the link/braid/writhe at infinity). Then we look for complete proper non holomorphic minimal tori with total curvature −8π and a single end immersed in R^4. We translate the problem into a system of 10 quadratic or linear equations in 11 real variables with coefficients in terms of the Weierstrass function ℘ and give explicit solutions for these equations if T is a rectangular torus. For the square torus, we have a complete answer with a unique family of solutions generalizing the Chen-Gackstetter torus in R3. On the other hand, we show that there is no solution on the equianharmonic torus.30 pages, 4 figure

Some Comparison Results for First-Order Hamilton-Jacobi Equations and Second-Order Fully Nonlinear Parabolic Equations with Ventcell Boundary Conditions

International audienceIn this article, we consider fully nonlinear, possibly degenerate, parabolic equations associated with Ventcell boundary conditions in bounded or unbounded, smooth domains. We first analyze the exact form of such boundary conditions in general domains in order that the notion of viscosity solutions makes sense. Then we prove general comparison results, both for first- and second-order equations, under rather natural assumptions on the nonlinearities: $(i)$ in the second-order case, the only restrictive assumption is that the equation has to be strictly elliptic in the normal direction, in a neighborhood of the boundary; $(ii)$ in the first-order one, quasiconvexity assumptions have to be imposed both on the equation and the boundary condition, the equation being coercive in the normal direction. Our method is inspired by the ``twin blow-up method'' of Forcadel-Imbert-Monneau, that we adapt to a scaling consistent with the Ventcell boundary condition

Immersive Environments

International audienceImmersive environments present significant management opportunities for businesses, enabling innovative approaches toemployee engagement, customer interactions, and operational efficiency. Through the integration of virtual and augmented realitytechnologies, organizations can enhance training programs, improve workplace safety, and optimize operational support in sectorssuch as manufacturing and engineering. Additionally, immersive environments facilitate remote collaboration, talent acquisition,and the creation of engaging work environments, addressing the challenges of a competitive job market. Looking forward,advancements in technology and user experience will drive the widespread adoption of immersive environments, fosteringinterdisciplinary collaboration to create personalized and interactive experiences. As immersive technologies become moreaccessible and widespread, accompanied by supplementary tools and techniques, they hold immense potential to revolutionizeindustries beyond entertainment, including healthcare and education. The trajectory of immersive environments points towardscontinued growth, innovation, and enhanced human engagement across various sectors, signaling a transformative shift in howbusinesses operate and interact with their stakeholders. Also, we propose the holistic framework for immersive environments,comprising three interconnected elements: immersive technology, environment, and experiences. These elements collectively shapeand define the nature of immersive environments, influencing their creation, deployment, and impac

From Astronomical Computation to Astrological Interpretation: figurae caeli and ‘Astrological Squares’ in Fifteenth-Century Annual Prognostications

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Effect of fluid salinity and melt composition on the fluid-melt partitioning of Cu-Zn evidenced by ex situ and in situ measurements.

International audienceThe growing worldwide demand for metals for industrial purposes has led to the development of new experimental approaches to quantify the extraction of metals from magmatic sources. This implies calculating metal partition coefficients between fluid and melt phases at high pressure and high temperature conditions. Such constraints are necessary to understand metal mobility and deposition in magmatic-hydrothermal environments. Cu and Zn have recently received particular attention, being among the 5 more demanded metals for energy transition due to their wide use in industrial domains.Previous Cu-Zn fluid-melt partitioning experiments involved fluid inclusion synthesis in cold seal pressure vessels (CSPV) and internally heated pressure vessels (IHPV) with post-mortem analysis of quenched fluids in equilibrium with felsic melts. These studies showed a high scattering of partition coefficient values (from 0.5 to 433 for Cu and from 0.01 to 136.1 for Zn), which may arise from the different P-T conditions investigated and the compositions of melts and fluids [1,2,3,4]. Yet this scatter also points to potential issues and limitations with the employed methods such as uncertainties while measuring.To overcome those limitations, an approach combining in situ and ex situ techniques has been employed. The ex situ technique involves an IHPV with quench melt analysis by LA-ICP-MS and quench fluid analysis performed by ion chromatography for cations/anions and solution ICP-MS for trace elements; it was employed for dacite and rhyolite melts [5, 6]. However, this method relies on the analysis of post-mortem samples, which do not preserve HP-HT information. A newly developed experimental method for in situ measurements also is thus presented involving an IHPV provided with transparent windows allowing a laser or Synchrotron X-ray beam to be transmitted through. Both methods have been comparatively applied to calculate Cu-Zn fluid-melt partition coefficients in pure water and a 0.2m NaCl solution with haplogranite-rhyolite-andesite melts (1000 bar – 800-1000 °C). This data allows to discuss the effect of fluid salinity and melt composition. Preliminary analyses show higher contents of Zn in the melts compared to Cu (> 500 ppm against ~45 ppm) suggesting that Zn has a stronger affinity for the melt relative to Cu.[1] Bai and Koster van Groos, 1999. GCA 63, 1117-1131[2] Williams et al., 1995, Contrib. Mineral. Petrol. 121, 388-399[3] Urabe, 1987, Eco. Geol. 82, 1049-1052[4] Zajacz et al., 2008, GCA 72, 2169-2197[5] Iveson et al., 2019, 516, 18-41[6] Gion et al., 2022, Chem. Geol. 1

Medical gas plasma modulates in vitro keratinocyte redox signaling and secretory profiles in actinic keratosis and squamous cell carcinoma

International audienceActinic keratosis (AK) and squamous cell carcinoma (SCC) represent progressive keratinocyte disorders in which oxidative stress and dysregulated signaling contribute to disease pathology. Medical gas plasma is an emerging therapeutic tool that generates reactive oxygen and nitrogen species capable of modulating cellular function.Here, we evaluated a newly developed helium multijet plasma device for its potential to treat precancerous and cancerous keratinocyte diseases. To cover the entire keratinocyte carcinogenesis process, in vitro models of normal keratinocytes (HaCaT), AK (HT-297.T), and SCC (A431) were used. A 2-minute plasma treatment produced moderate levels of reactive species in the liquid phase, inducing intracellular oxidation and decreasing viability in a cell type-dependent manner, being most effective in SCC. Plasma exposure modulated stress-and survival-associated signaling pathways and reshaped the secretion of growth factors and pro-inflammatory chemokines, with AK cells showing the most pronounced responses. These findings demonstrate that plasmagenerated oxidants act as signaling mediators that can fine-tune keratinocyte behavior without overt cytotoxicity in vitro, supporting the potential of controlled plasma exposure as a therapeutic strategy for actinic keratosis and other skin cancers.</p

A deep learning strategy to calibrate heteroatomic interactions in metal alloys

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Natural Deep Eutectic Solvents : Exploring the in vitro sensory properties

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