1,721,125 research outputs found
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe 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
Full text link“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
Full text linkWe 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
Oxydation atmosphérique hétérogène de HAP et de PBDE : cinétique, produits et génotoxicité
No full textCe travail a eu pour objectif l’étude de la dégradation hétérogène d’hydrocarbures aromatiques polycycliques (HAP) et de polybromo diphényles éthers (PBDE) en présence d’oxydants atmosphériques. La réactivité du benzo[a]pyrène et du dibenzo[a,l]pyrène pour les HAP et du BDE 153 (hexabromé) et du BDE 209 (décabromé) pour les PBDE, a été étudiée lorsqu’ils sont adsorbés sur des particules minérales modèles (des particules de silice) et exposés à l’ozone, au dioxyde d’azote ou aux radicaux hydroxyles. L’extraction et l’analyse de ces composés ont été optimisées. Le suivi de l’évolution de la concentration en composé adsorbé en fonction de son temps d’exposition à l’oxydant a permis de déterminer les paramètres cinétiques de chaque composé, pour chaque oxydant. L’influence de la concentration particulaire et de la structure moléculaire sur la réactivité a ainsi été évaluée et débattue. L’identification des produits de réactions majoritaires a été effectuée pour les réactions des HAP avec le dioxyde d’azote et les radicaux hydroxyles et les réactions des PBDE avec les radicaux hydroxyles. Enfin, l’étude de la génotoxicité des extraits de particules pour différents temps d’exposition aux oxydants a été réalisée. Cette étude regroupe une approche cinétique, une approche mécanistique et une approche toxicologique.This work deals with the heterogeneous degradation of polycyclic aromatic hydrocarbons (PAH) and polybromo diphenyls ethers (PBDE) with various atmospheric oxidants. The reactivity of Benzo[a]pyrene (BaP) and dibenzo[a,l]pyrene (DalP) for PAH and BDE 153 and BDE 209 for PBDE, had been studied when they are adsorbed on a model of mineral particles (silica particles) and exposed to ozone, nitrogen dioxide and hydroxyl radical. Extraction and analyse of compounds were optimised. For all studied reactions, kinetic parameters were obtained following the remaining concentration of compound for different exposure times. Influence of the particle loading and molecular structure on the reactivity had been evaluated and discussed. Identification of the main degradation products was made for the reaction of PAH with nitrogen dioxide and hydroxyl radical and for the reaction of PBDE with hydroxyl radical. Then, the genotoxicity of the particle extracts was made for different exposure times. This study talks about kinetics, mechanistic and genotoxicity
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe 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
Oxydation atmosphérique hétérogène de HAP et de PBDE : cinétique, produits et génotoxicité
No full textCe travail a eu pour objectif l’étude de la dégradation hétérogène d’hydrocarbures aromatiques polycycliques (HAP) et de polybromo diphényles éthers (PBDE) en présence d’oxydants atmosphériques. La réactivité du benzo[a]pyrène et du dibenzo[a,l]pyrène pour les HAP et du BDE 153 (hexabromé) et du BDE 209 (décabromé) pour les PBDE, a été étudiée lorsqu’ils sont adsorbés sur des particules minérales modèles (des particules de silice) et exposés à l’ozone, au dioxyde d’azote ou aux radicaux hydroxyles. L’extraction et l’analyse de ces composés ont été optimisées. Le suivi de l’évolution de la concentration en composé adsorbé en fonction de son temps d’exposition à l’oxydant a permis de déterminer les paramètres cinétiques de chaque composé, pour chaque oxydant. L’influence de la concentration particulaire et de la structure moléculaire sur la réactivité a ainsi été évaluée et débattue. L’identification des produits de réactions majoritaires a été effectuée pour les réactions des HAP avec le dioxyde d’azote et les radicaux hydroxyles et les réactions des PBDE avec les radicaux hydroxyles. Enfin, l’étude de la génotoxicité des extraits de particules pour différents temps d’exposition aux oxydants a été réalisée. Cette étude regroupe une approche cinétique, une approche mécanistique et une approche toxicologique.This work deals with the heterogeneous degradation of polycyclic aromatic hydrocarbons (PAH) and polybromo diphenyls ethers (PBDE) with various atmospheric oxidants. The reactivity of Benzo[a]pyrene (BaP) and dibenzo[a,l]pyrene (DalP) for PAH and BDE 153 and BDE 209 for PBDE, had been studied when they are adsorbed on a model of mineral particles (silica particles) and exposed to ozone, nitrogen dioxide and hydroxyl radical. Extraction and analyse of compounds were optimised. For all studied reactions, kinetic parameters were obtained following the remaining concentration of compound for different exposure times. Influence of the particle loading and molecular structure on the reactivity had been evaluated and discussed. Identification of the main degradation products was made for the reaction of PAH with nitrogen dioxide and hydroxyl radical and for the reaction of PBDE with hydroxyl radical. Then, the genotoxicity of the particle extracts was made for different exposure times. This study talks about kinetics, mechanistic and genotoxicity
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
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