Search results for "Astronomie"
showing 10 items of 151 documents
The promise of spintronics for unconventional computing
2021
Novel computational paradigms may provide the blueprint to help solving the time and energy limitations that we face with our modern computers, and provide solutions to complex problems more efficiently (with reduced time, power consumption and/or less device footprint) than is currently possible with standard approaches. Spintronics offers a promising basis for the development of efficient devices and unconventional operations for at least three main reasons: (i) the low-power requirements of spin-based devices, i.e., requiring no standby power for operation and the possibility to write information with small dynamic energy dissipation, (ii) the strong nonlinearity, time nonlocality, and/o…
La mise en scène du service gastronomique
2016
National audience
Critical proofreading of the book "Les derniers jours du siège d'Alésia"
2023
Was there a lunar eclipse that could have influenced the outcome of the Battle of Alesia? This is the argument developed in the book by Alain Deyber and David Romeuf, «Les Derniers Jours du Siège d'Alésia». Having verified the existence of an eclipse on the date given by the authors and based on the latest publications as well as on the scientific consensus, we conduct a critical study on the chronology of the siege and on the ethnological arguments, even ethno-astronomical of the authors.
Search for Multimessenger Sources of Gravitational Waves and High-energy Neutrinos with Advanced LIGO during Its First Observing Run, ANTARES, and Ic…
2019
[EN] Astrophysical sources of gravitational waves, such as binary neutron star and black hole mergers or core-collapse supernovae, can drive relativistic outflows, giving rise to non-thermal high-energy emission. High-energy neutrinos are signatures of such outflows. The detection of gravitational waves and high-energy neutrinos from common sources could help establish the connection between the dynamics of the progenitor and the properties of the out¿ow. We searched for associated emission of gravitational waves and high-energy neutrinos from astrophysical transients with minimal assumptions using data from Advanced LIGO from its first observing run O1, and data from the ANTARES and IceCub…
Reliability of genomic variants across different next-generation sequencing platforms and bioinformatic processing pipelines
2021
Abstract Background Next Generation Sequencing (NGS) is the fundament of various studies, providing insights into questions from biology and medicine. Nevertheless, integrating data from different experimental backgrounds can introduce strong biases. In order to methodically investigate the magnitude of systematic errors in single nucleotide variant calls, we performed a cross-sectional observational study on a genomic cohort of 99 subjects each sequenced via (i) Illumina HiSeq X, (ii) Illumina HiSeq, and (iii) Complete Genomics and processed with the respective bioinformatic pipeline. We also repeated variant calling for the Illumina cohorts with GATK, which allowed us to investigate the e…
La gastronomie au cœur de la Cité.
2016
International audience; Chercheurs, chefs, professionnels, acteurs publics et industriels s’intéressent dans cet ouvrage à la Cité d’hier, d’aujourd’hui et de demain. À l’heure où le Repas gastronomique des Français est inscrit au patrimoine immatériel de l’UNESCO, la mise en œuvre du réseau des Cités de La gastronomie (Tours, Paris-Rungis, Lyon et Dijon) démontre, une nouvelle fois l’importance du fait alimentaire dans notre culture. Penser l’identité gastronomique demande alors de se libérer d’une tension entre deux visions trop étriquées. Soit à travers une conception de l’identité attachée exclusivement à la tradition, au passé, prise aussi et pétrifiée dans ses racines qui entravent so…
Mechanism for ultrafast electric-field driven skyrmion nucleation
2021
We show how a Dzyaloshinskii-Moriya interaction can be generated in an ultrathin metal film from a femtosecond pulse in electric field. This interaction does not require structural inversion-symmetry breaking, and its amplitude can be tuned depending on the amplitude of the field. We perform first-principles calculations to estimate the strength of the field-induced magnetoelectric coupling for ferromagnetic Fe, Co, and Ni, and antiferromagnetic Mn, as well as FePt and MnPt alloys. Last, using atomistic simulations, we demonstrate how an isolated antiferromagnetic skyrmion can be coherently nucleated from the collinear background by an ultrashort pulse in electric field on a hundred-femtose…
Du sens à l'expérience : gastronomie et œnologie au prisme de leurs terminologies : [actes du 2ème colloque international "Les terminologies professi…
2018
National audience; Entre expérience sensorielle, sensible et symbolique, cet ouvrage nous convie à un voyage particulier où se jouent les interactions de toute nature qui accompagnent les moments de notre existence. De la langue au langage, des perceptions aux émotions, de la culture à la nature ou de la suggestion à la relation, le discours gastronomique et øenologique construit un imaginaire en s'appuyant sur des fragments de réalité qu'il tend à comprendre et analyser.
Intrinsic backgrounds from Rn and Kr in the XENON100 experiment
2018
In this paper, we describe the XENON100 data analyses used to assess the target-intrinsic background sources radon ([InlineMediaObject not available: see fulltext.]), thoron ([InlineMediaObject not available: see fulltext.]) and krypton ([InlineMediaObject not available: see fulltext.]). We detail the event selections of high-energy alpha particles and decay-specific delayed coincidences. We derive distributions of the individual radionuclides inside the detector and quantify their abundances during the main three science runs of the experiment over a period of ∼4years, from January 2010 to January 2014. We compare our results to external measurements of radon emanation and krypton concentr…
Coherent Excitation of Heterosymmetric Spin Waves with Ultrashort Wavelengths
2017
In the emerging field of magnonics, spin waves are foreseen as signal carriers for future spintronic information processing and communication devices, owing to both the very low power losses and a high device miniaturisation potential predicted for short-wavelength spin waves. Yet, the efficient excitation and controlled propagation of nanoscale spin waves remains a severe challenge. Here, we report the observation of high-amplitude, ultrashort dipole-exchange spin waves (down to 80 nm wavelength at 10 GHz frequency) in a ferromagnetic single layer system, coherently excited by the driven dynamics of a spin vortex core. We used time-resolved x-ray microscopy to directly image such propagati…