1,720,954 research outputs found
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Get PDF“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Get PDFWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Get PDFWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
Emission et visualisation de particules de frein: Application sur un banc de freinage à échelle réduite intégrant des conditions d’écoulement représentatives
No full textThèse sous embargo de l’auteur jusqu’au 11-07-2025.Reducing particulate emissions, particularly PM10, PM2.5, and ultrafine particles, has become a critical environmental and public health issue. Their dispersion in the nearby environment during friction braking is linked, on one hand, to the thermomechanical stresses at the pad-disc interface, and on the other hand, to the under-vehicle clearance, which affects their initial trajectory. This thesis is part of the BREAQ project, aimed at reducing exposure to fine particles generated by railway braking. The work presented in this dissertation specifically focuses on correlating particle production with thermomechanical parameters in the contact of a disc brake and evaluating their trajectory through visualization techniques. A scaled-down braking test bench was designed to maintain equivalency in dissipated heat flux density and was integrated into a wind tunnel to simulate train movement. Airflow conditions were combined with braking conditions to accurately represent real urban journeys. Particles of various sizes were quantified in real-time using counters and spectrometers, based on braking and airflow parameters. The data show that tribological conditions influence the emission profile. The results highlight phases of particle emission (contact initiation, force maintenance, release). A Particle Imaging Velocimetry (PIV) analysis, usually employed to calculate the velocity field of a seeded fluid, was adapted to estimate the dispersion of particles near the braking system. The estimated particle velocity fields are consistent with counter measurements. The PIV analysis enabled the proposal of a temporal and spatial presence indicator of emitted particles during different braking phases.Réduire les émissions de particules, notamment les PM10, les PM2.5 et les ultrafines (<100nm) est devenu un enjeu environnemental et de santé publique. Leur dispersion dans l'environnement proche au cours du freinage à friction est liée, d'une part, aux sollicitations thermomécaniques à l'interface garniture – disque, et d'autre part, à l'encombrement sous véhicule qui va influencer leur trajectoire initiale. Cette thèse fait partie du projet BREAQ visant à réduire l'exposition aux particules fines issues du freinage ferroviaire. Les travaux présentés dans ce mémoire s'intéressent plus particulièrement à relier la production de particules aux paramètres thermomécaniques dans le contact d'un frein à disque et à évaluer leur trajectoire par une technique de visualisation. Un banc d'essai de freinage à échelle réduite est dimensionné de sorte à conserver une équivalence sur la densité de flux thermique dissipée et est intégré dans une soufflerie pour émuler le déplacement d'un train. Les conditions d'écoulement d'air sont combinées à celles de freinages afin d’être représentatives de trajets urbains réels. Les particules de différentes tailles sont quantifiées par des compteurs et spectromètres en temps réel, en fonction des paramètres de freinage et d’écoulement. Les données montrent une influence des conditions tribologiques sur le profil des émissions. Les résultats mettent en évidence des phases d'émission de particules (mise en contact, maintien de l’effort, retrait). Une analyse PIV (Particule Imaging Velocimetry), habituellement utilisée pour calculer le champ de vitesse d’un fluide ensemencé, est adaptée à notre étude pour estimer la dispersion des particules proche du système de freinage. Les champs de vitesse estimés des particules sont en cohérence avec les mesures des compteurs. L’analyse PIV a permis de proposer un indicateur de présence, temporel et spatial des particules émises, au cours des différentes phases d'un freinage
Emission and visualization of brake particles : Application on a reduced scale braking bench integrating representative flow conditions
No full textRéduire les émissions de particules, notamment les PM10, les PM2.5 et les ultrafines (<100nm) est devenu un enjeu environnemental et de santé publique. Leur dispersion dans l'environnement proche au cours du freinage à friction est liée, d'une part, aux sollicitations thermomécaniques à l'interface garniture – disque, et d'autre part, à l'encombrement sous véhicule qui va influencer leur trajectoire initiale. Cette thèse fait partie du projet BREAQ visant à réduire l'exposition aux particules fines issues du freinage ferroviaire. Les travaux présentés dans ce mémoire s'intéressent plus particulièrement à relier la production de particules aux paramètres thermomécaniques dans le contact d'un frein à disque et à évaluer leur trajectoire par une technique de visualisation. Un banc d'essai de freinage à échelle réduite est dimensionné de sorte à conserver une équivalence sur la densité de flux thermique dissipée et est intégré dans une soufflerie pour émuler le déplacement d'un train. Les conditions d'écoulement d'air sont combinées à celles de freinages afin d’être représentatives de trajets urbains réels. Les particules de différentes tailles sont quantifiées par des compteurs et spectromètres en temps réel, en fonction des paramètres de freinage et d’écoulement. Les données montrent une influence des conditions tribologiques sur le profil des émissions. Les résultats mettent en évidence des phases d'émission de particules (mise en contact, maintien de l’effort, retrait). Une analyse PIV (Particule Imaging Velocimetry), habituellement utilisée pour calculer le champ de vitesse d’un fluide ensemencé, est adaptée à notre étude pour estimer la dispersion des particules proche du système de freinage. Les champs de vitesse estimés des particules sont en cohérence avec les mesures des compteurs. L’analyse PIV a permis de proposer un indicateur de présence, temporel et spatial des particules émises, au cours des différentes phases d'un freinage.Reducing particulate emissions, particularly PM10, PM2.5, and ultrafine particles, has become a critical environmental and public health issue. Their dispersion in the nearby environment during friction braking is linked, on one hand, to the thermomechanical stresses at the pad-disc interface, and on the other hand, to the under-vehicle clearance, which affects their initial trajectory. This thesis is part of the BREAQ project, aimed at reducing exposure to fine particles generated by railway braking. The work presented in this dissertation specifically focuses on correlating particle production with thermomechanical parameters in the contact of a disc brake and evaluating their trajectory through visualization techniques. A scaled-down braking test bench was designed to maintain equivalency in dissipated heat flux density and was integrated into a wind tunnel to simulate train movement. Airflow conditions were combined with braking conditions to accurately represent real urban journeys. Particles of various sizes were quantified in real-time using counters and spectrometers, based on braking and airflow parameters. The data show that tribological conditions influence the emission profile. The results highlight phases of particle emission (contact initiation, force maintenance, release). A Particle Imaging Velocimetry (PIV) analysis, usually employed to calculate the velocity field of a seeded fluid, was adapted to estimate the dispersion of particles near the braking system. The estimated particle velocity fields are consistent with counter measurements. The PIV analysis enabled the proposal of a temporal and spatial presence indicator of emitted particles during different braking phases
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