Dermatologie du sensible au xixe siècle

L’iconographie dermatologique du xixe siècle n’a pas seulement une visée purement cognitive d’enseignement, elle concerne également le domaine de la sensation et de la perception esthésiques. En effet, outre le fait d’illustrer la pensée médicale de l’époque, les dessins et les photographies révèlent les intentions de leurs auteurs ou de leurs commanditaires. Il s’agit ainsi, à travers cette analyse, de considérer l’iconographie dermatologique du xixe siècle selon les catégorisations du sensible et de l’intelligible et sous l’angle d’une sémiotique des cultures.The dermatological iconography of the xixe century does not have a purely cognitive or educational aim, it also relates to the senses and to “ perception esthesics ”. These drawings and photographs, not only do they illustrate the medical thought of their times, but they reveal the intentions of their authors or their sponsors. Our aim is to study, in this essay, the dermatological iconography of the xixe century, from the point of view of the senses, from a cognitive and intellective standpoint, as well as from the perspective of a semiotics of cultures

Partial charge transfer and absence of induced magnetization in EuS(111)/Bi2Se3 heterostructures

Heterostructures made from topological and magnetic insulators promise to form excellent platforms for new electronic and spintronic functionalities mediated by interfacial effects. We report the results of a first-principles density functional theory study of the geometric, electronic structure, and magnetic properties of the EuS(111)/Bi2Se3 interface, including van der Waals and relativistic spin-orbit effects. In contrast to previous theoretical studies, we find no appreciable magnetic anisotropy in such a heterostructure. We also do not see additional induced magnetization at the interface or the magnetic proximity effect on the topological states. This is due to the localized nature of Eu moments and because of a partial charge transfer of ∼0.5 electron from Eu to Se. The formation of the surface dipole shifts the Dirac cone about 0.4 eV below the chemical potential, and the associated electrostatic screening moves the topological state from the first to the second quintuple layer of Bi2Se3

The Threat to Weather Radars by Wireless Technology

Wireless technology, such as local area telecommunication networks and surveillance cameras, causes severe interference for weather radars because they use the same operational radio frequencies. One or two disturbances can be removed from the radar image, but the number and power of the interfering wireless devices are growing all over the world, threatening that one day the radars could become useless for weather observations. Some agencies have already changed or are considering changing frequency bands, but now even other bands are under threat. Use of equipment at radio frequencies is regulated by laws and international agreements. Technologies have been developed for peaceful coexistence. If wireless devices use these technologies to protect weather radars, their data transmission capabilities become limited, so it is tempting to violate the regulations. Hence, it is an important task for the worldwide weather community to involve themselves in the radio frequency management process and work in close contact with their national radio authorities to ensure that meteorological interests be duly taken into account in any decision-making process toward the future usage of wireless devices.United States. Federal Aviation Administration (FA8721-05-C-0002

Démontrer la capacité de l’agriculture à relever le défi énergétique: L’agriculture face à de multiples défis

première partie du dossier : Économies d’énergie et précarité énergétiqueabsen

Study of the interaction between a Zirconium thin film and an EN C100 steel substrate: temperature effect

Zirconium thin films were grown on high carbon steel substrates EN C100 (1 %wt. of carbon) by RF magnetron sputtering. In order to study the reactivity of the film/substrate system as a function of the temperature, one hour vacuum annealing was carried out for different temperatures between 600°C and 1100°C. The films were then analyzed by X-ray diffraction, scanning electron microscopy, glow discharge optical emission spectroscopy (GDOES) and nanoindentation. The obtained results showed a progressive transformation of zirconium film to zirconium carbide. Carbon atoms diffusion from substrate toward the film induced this transformation. The sample annealed at 900°C exhibited the best mechanicals properties (H =17 GPa and E = 220 GPa). Samples treated at higher temperature were affected by oxidation and high microporosity. Even if the conversion is uncomplete, annealing significantly promotes adhesion of the film on the substrate