L’épidémie de Covid-19 survenue en mars 2020 a mobilisé tous les personnels des hôpitaux plus touchés et contraint leur administration à suspendre restrictions budgétaires pour accueillir l’afflux malades. À partir d’une enquête qualitative menée dans deux d’Île-de-France du Grand-Est, cette contribution montre ce qu...

We use a recently derived result to extract from two-pion interferometry data from pp̄ collisions the radius of the coherent component in the source. We find a coherent source radius of about 2fm. PACS numbers: 25.75. -q, 25.70. Pq, 25.70 Gh. Two-particle Bose-Einstein interferometry (also known as Hanbury Brown-Twiss intensity interferometry) as a method for obtaining information on the space-t...

In response to the claim by Dziembowski et al. (2001) that the solar radius decreases with magnetic activity at the rate of 1.5 km yr, we consider the theoretical question whether a radius variation is expected with the solar cycle. If the radius variation is caused by the magnetic pressure of toroidal flux tubes at the bottom of the convection zone, then the dynamo model of Nandy and Choudhuri...

Dans un article paru en mai 2021 dans notre série consacrée à la mer et aux océans, Sébastien Abis Cyrille Coutansais ont porté coup de projecteur sur le secteur aquacole français, soulignant les défis auxquels il était confronté contexte mondialisation des échanges, mais aussi ses atouts pour renforcer agricole français sécurit&#...

In this study, we simulated the electron density disturbance at night in bottom of ionosphere caused by electrostatic field a thundercloud. The simulation was conducted using charge thundercloud as source, incorporating more up-to-date conductivity profile, and ion chemistry model for lower ionosphere. results revealed that 30–100 C can cause ionosphere, decreasing to 40% original value or incr...

Cet article retrace l’histoire de la rencontre deux jeunes gens dans une ville banlieue parisienne en 1950. La source est composée d’un ensemble documents exceptionnels, et notamment un poème d’une cinquantaine pages qui raconte heure par cette les premiers rendez-vous, jusqu’au consentement arraché aux parents. précision du récit permet d’...

A paraboloidal bow shock model is developed in order to estimate the surface distribution of gas shock-induced modifications surrounding Venusian impact craters. We apply two-dimensional oblique shock dynamics to describe a three-dimensional paraboloidal-shaped bow shock impinging upon an assumed incompressible Venusian surface. The effects of the hypersonic atmospheric shock acting on the Venu...

In a recent update of the Dutch contingency plan for controlling outbreaks of classical swine fever (CSF), emergency vaccination is preferred to large-scale pre-emptive culling. This policy change raised two questions: can emergency vaccination be as effective as pre-emptive culling, and what are the implications for showing freedom of infection? Here, we integrate quantitative information avai...

We have discovered strong gravitational lensing by the galaxy ESO325–G004, in images obtained with the Advanced Camera for Surveys on the Hubble Space Telescope. The lens galaxy is a boxy group-dominant elliptical at z = 0.0345, making this the closest known galaxy-scale lensing system. The lensed object is very blue (B− Ic ≈ 1.1), and forms two prominent arcs and a less extended third image. T...

The nearby galaxy M33 was observed by the imaging X-ray instruments on-board BeppoSAX. Two observations at di erent phases of the 105.9 day intensity cycle of the luminous central source X-8 failed to reveal the expected modulation, suggesting that it is probably transitory. Similar behavior has been observed from several X-ray binary sources. This strengthens somewhat the idea that M33 X-8 is ...