Search results for "document."
showing 10 items of 1530 documents
Search for photons with energies above 1018 eV using the hybrid detector of the Pierre Auger Observatory
2017
A search for ultra-high energy photons with energies above 1 EeV is performed using nine years of data collected by the Pierre Auger Observatory in hybrid operation mode. An unprecedented separation power between photon and hadron primaries is achieved by combining measurements of the longitudinal air-shower development with the particle content at ground measured by the fluorescence and surface detectors, respectively. Only three photon candidates at energies 1-2 EeV are found, which is compatible with the expected hadron-induced background. Upper limits on the integral flux of ultra-high energy photons of 0.027, 0.009, 0.008, 0.008 and 0.007 km-2 sr-1 yr-1 are derived at 95% C.L. for ener…
Ultra-High Energy Neutrinos at the Pierre Auger Observatory
2013
The observation of ultrahigh energy neutrinos (UHE nu s) has become a priority in experimental astroparticle physics. UHE nu s can be detected with a variety of techniques. In particular, neutrinos can interact in the atmosphere (downward-going nu) or in the Earth crust (Earth-skimming nu), producing air showers that can be observed with arrays of detectors at the ground. With the surface detector array of the Pierre Auger Observatory we can detect these types of cascades. The distinguishing signature for neutrino events is the presence of very inclined showers produced close to the ground (i.e., after having traversed a large amount of atmosphere). In this work we review the procedure and …
On Line Validation Exercise (OLIVE): A Web Based Service for the Validation of Medium Resolution Land Products. Application to FAPAR Products
2014
International audience; The OLIVE (On Line Interactive Validation Exercise) platform is dedicated to the validation of global biophysical products such as LAI (Leaf Area Index) and FAPAR (Fraction of Absorbed Photosynthetically Active Radiation). It was developed under the framework of the CEOS (Committee on Earth Observation Satellites) Land Product Validation (LPV) sub-group. OLIVE has three main objectives: (i) to provide a consistent and centralized information on the definition of the biophysical variables, as well as a description of the main available products and their performances (ii) to provide transparency and traceability by an online validation procedure compliant with the CEO…
Author Correction: Evaluation of three methods for biomass estimation in small invertebrates, using three large disparate parasite species as model o…
2018
Invertebrate biomass is considered one of the main factors driving processes in ecosystems. It can be measured directly, primarily by weighing individuals, but more often indirect estimators are used. We developed two indirect and non-destructive approaches to estimate biomass of small invertebrates in a simple manner. The first one was based on clay modelling and the second one was based on image analysis implemented with open-source software. Furthermore, we tested the accuracy of the widely used geometric approximation method (third method). We applied these three different methods to three morphologically disparate model species, an acanthocephalan worm, a crustacean and a flatworm. To …
Contre la fausse objectivité, le perspectivisme assumé ? le reportage « gonzo » de Goldin, Clark, D’Agata, Tillmans contre la photographie « document…
2019
International audience; Après 1945, un certain nombre de praticiens de la « photographie plasticienne »privilégièrent le reportage « communautaire » : une plongée, sur le long terme, au sein d’ungroupe d’individus, souvent connus, voire intimes, du photographe, qui loin de se placercomme un témoin neutre, activait le mécanisme de l’observation participante chère àl’ethnographie. Larry Clark en fournit un exemple avec la série Tulsa (1971), la premièred’une longue lignée. Nan Goldin amplifia d’autant l’inclusion de l’autrice par la pratique del’autoportrait en situation dans The Ballad of Sexual Dependency (1981-1996). Plus tard desartistes comme Antoine d’Agata ou Wolfgang Tillmans poursuiv…
Exploring the collaborative synthesis of information during online reading
2019
Abstract This descriptive study sought to understand the complexities of integrative processing during collaborative online reading. Student pairs constructed a collaborative understanding while reading online information about a controversial issue by connecting, combining and organizing information that originated from prior knowledge, self-selected online texts, and discussions during an online inquiry task. Thirty-eight students from an upper secondary school in Finland worked in pairs to read online information and write an essay with the help of an argument graph tool. Primary data sources consisted of: prior knowledge; discussions; notes recorded with a graphic representational tool;…
IME/Índice Médico Español. Perspectivas y retos tras 40 años de tradición bibliográfica en ciencias de la salud (1964-2003).
2004
Al cumplir cuarenta años de pervivencia, la base de datos IME, versión automatizada del repertorio Índice Médico Español, constituye la mayor base de datos bibliográfica sobre publicaciones en ciencias de la salud en español. Actualmente ha iniciado una nueva etapa en la que pretende responder a las nuevas exigencias de la sociedad mediante la incorporación de algunas innovaciones documentales y tecnológicas. Para ello, se ha mejorado el sistema de gestión de la base de datos mediante aplicaciones que permiten el teletrabajo en tiempo real y la actualización constante de los registros. Además, se ha ampliado su cobertura con la incorporación de nuevas revistas, algunas de ellas electrónicas…
La prise en compte des facteurs humains dans les process de conception et de livraison du groupe Bull
2000
Pôle Rhône-Alpes de Sciences Cognitives Journée thématique Novadis Services - Multicom; National audience; Compte rendu d'études ergonomiques menées pour l'entreprise Bull à Échirolles (38)
Évaluer un document numérique : Principes et méthodes
2010
International audience; Lors d'une démarche d'évaluation, il est nécessaire de définir ce que l'on souhaite évaluer. Pour cela, il convient de considérer que l'utilisation d'un document numérique se situe dans le contexte d'une activité menée par l'intermédiaire d'un dispositif technique. L'utilisateur se trouve donc exposé à une double contrainte, celle de devoir trouver des informations, intégrer des connaissances nouvelles sur un domaine donné, résoudre un problème, et pour ce faire, utiliser, en même temps, un dispositif technique (un document numérique développé à cet effet). On comprend que cette double contrainte et cette structure de buts vont rendre ce type de …
Validation ergonomique expérimentale : Site droit du travail en ligne
2003
Rapport d'expertise; Test ergonomique auprès d'utilisateurs d'un logiciel d'enseignement à distance du droit du travail.