Search results for "Physique"
showing 10 items of 305 documents
L’apport des méthodes de datation physique à la caractérisation et à la datation de matériaux de construction et structures architecturales : un bila…
2010
International audience
La distinction et l'union de l'âme et du corps : l'une est-elle plus cartésienne que l'autre ?
2015
National audience
Excitons in few-layer hexagonal boron nitride: Davydov splitting and surface localization
2018
Hexagonal boron nitride (hBN) has been attracting great attention because of its strong excitonic effects. Taking into account few-layer systems, we investigate theoretically the effects of the number of layers on quasiparticle energies, absorption spectra, and excitonic states, placing particular focus on the Davydov splitting of the lowest bound excitons. We describe how the inter-layer interaction as well as the variation in electronic screening as a function of layer number $N$ affects the electronic and optical properties. Using both \textit{ab initio} simulations and a tight-binding model for an effective Hamiltonian describing the excitons, we characterize in detail the symmetry of t…
Irène Popard et Alice Milliat intéressent L'Auto (1921-1939)
2020
International audience
The Influence of the Digitalisation of the Distribution Channel in the Process of Bypassing Wholesalers: The Case of a Distribution Triad
2022
• ObjectivesThe wholesaler, a traditional player in distribution, has been going through a new phase in its evolution over the last twenty years. Driven by the digitalisation of activities, upstream and downstream players are trying to bypass it and new players such as commercial platforms are appearing. In order to understand this phenomenon, this research analyses how the wholesaler manages to keep a part of the flows between the actors of the distribution channel.• MethodA qualitative analysis by individual interviews within the building materials sector highlights the appropriation of informational flows by manufacturers leading to the phenomenon of partial disintermediation which affec…
Feasibility and physics potential of detecting $^8$B solar neutrinos at JUNO
2021
The Jiangmen Underground Neutrino Observatory (JUNO) features a 20 kt multi-purpose underground liquid scintillator sphere as its main detector. Some of JUNO's features make it an excellent location for 8B solar neutrino measurements, such as its low-energy threshold, high energy resolution compared with water Cherenkov detectors, and much larger target mass compared with previous liquid scintillator detectors. In this paper, we present a comprehensive assessment of JUNO's potential for detecting 8B solar neutrinos via the neutrino-electron elastic scattering process. A reduced 2 MeV threshold for the recoil electron energy is found to be achievable, assuming that the intrinsic radioactive …
A Search for Ultra-high-energy Neutrinos from TXS 0506+056 Using the Pierre Auger Observatory
2020
Results of a search for ultra-high-energy neutrinos with the Pierre Auger Observatory from the direction of the blazar TXS 0506+056 are presented. They were obtained as part of the follow-up that stemmed from the detection of high-energy neutrinos and gamma rays with IceCube, Fermi-LAT, MAGIC, and other detectors of electromagnetic radiation in several bands. The Pierre Auger Observatory is sensitive to neutrinos in the energy range from 100 PeV to 100 EeV and in the zenith-angle range from θ = 60° to θ = 95°, where the zenith angle is measured from the vertical direction. No neutrinos from the direction of TXS 0506+056 have been found. The results were analyzed in three periods: One of 6 m…
Entretien avec Isabelle Collet à propos de son ouvrage Les oubliées du numérique
2020
Avec sa publication « Les oubliées du numérique » Isabelle Collet, à travers d’exemples issus de vingt ans de recherche sur le genre et l’informatique, nous amène, tout d’abord, à mieux comprendre le fonctionnement des mécanismes qui opèrent autour de l’exclusion des femmes dans le numérique. Elle offre ensuite une analyse approfondie sur l’efficacité des différentes pratiques pour l’inclusion des femmes dans ce secteur et propose une stratégie d’action en trois étapes – intéresser, recruter, socialiser – pour changer le système et le rendre plus inclusif. Dans l’entrevue qui suit, l’autrice partage avec Loïc Szerdahelyi les réflexions au cœur de son ouvrage.
Génomique du phytoplasme de la Flavescence Dorée
2008
National audience
Depletion induced isotropic-isotropic phase separation in suspensions of rod-like colloids
2007
When non-adsorbing polymers are added to an isotropic suspension of rod-like colloids, the colloids effectively attract each other via depletion forces. We performed Monte Carlo simulations to study the phase diagram of such rod-polymer mixture. The colloidal rods were modeled as hard spherocylinders; the polymers were described as spheres of the same diameter as the rods. The polymers may overlap with no energy cost, while the overlap of polymers and rods is forbidden. Large amounts of depletant cause phase separation of the mixture. We estimated the phase boundaries of isotropic-isotropic coexistence both in the bulk and in confinement. To determine the phase boundaries we applied the gra…