1,721,000 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
Etude expérimentale et théorique de l'endommagement du graphite sous sollicitation dynamique - Application aux impacts hypervéloces
No full textComposite materials are widely used in various applications and may be submittedto hypervelocity impacts (HVI), such as in the aerospace field. The size of the impactors beingclose to that of a strand of fibers, mesoscopic simulations are of great interest but they need reliablenumerical models for each meso-Constituent. Graphite often being used as fiber or matrix,we studied its dynamic behavior. Penetration and craterization experiments have been conductedonto porous isotropic graphite. Post-Mortem analysis of targets, associated to order-Of-Magnitudecalculations, sheds a new light on the phenomenology of impacts and brings useful informationfor numerical simulation. A model for porous and brittle materials, implemented into a hydrocode,is used. Partially based on static mechanical properties, it has been progressively tested on planeshocks. Its use for simulating HVI gives satisfying results. Nevertheless, it was necessary to validateit by disregarding the projectile behavior. In that purpose, a campaign of laser-Driven shocks hasbeen conducted. In-Situ diagnostics have been simultaneously used and their correlation with postmortemanalysis allowed the identification of different damaging regimes of the targets. Finally,although the equivalence between HVI and laser-Driven shocks is not proved, the latter turned outto be complementary, suggesting the future evolutions of the numerical model.Les matériaux composites sont très utilisés dans diverses applications et sont parfoissoumis à des impacts hypervéloces (IHV), notamment dans le domaine spatial. La taille des impacteursétant proche de celle des torons de fibres, les simulations mésoscopiques ont tout leurintérêt mais nécessitent des modèles numériques aboutis pour chaque sous-Constituant. Le graphiteétant souvent utilisé comme matrice ou fibres, nous avons étudié son comportement dynamique.Ainsi, des expériences de pénétration et de cratérisation ont été menées sur un isographite poreux.L’analyse post-Mortem des cibles, associée à des calculs d’ordre de grandeur, apporte un éclairagenouveau sur la phénoménologie des impacts et fournit des renseignements utiles à la simulationnumérique. Un modèle pour matériaux poreux et fragiles, implémenté dans un code de dynamiquerapide, est utilisé. Basé en partie sur des propriétés statiques, il a été progressivement testé sur deschocs plans. Son utilisation pour la simulation des IHV donne de bons résultats. Toutefois, il convenaitde le valider en s’affranchissant du comportement du projectile. Pour cela, une campagne dechocs lasers a été menée. Des diagnostics in-Situ ont été utilisés et leur corrélation avec des analysespost-Mortem a permis l’identification de différents modes d’endommagement des cibles. Finalement,bien que l’équivalence entre IHV et chocs lasers ne soit pas démontrée, ces derniers se sont montréscomplémentaires en suggérant de futures évolutions du modèle numérique
Expérimental and Theoretical Study of the Damaging of Graphite under Dynamic Loading - Application to Hypervelocity Impacts
No full textLes matériaux composites sont très utilisés dans diverses applications et sont parfoissoumis à des impacts hypervéloces (IHV), notamment dans le domaine spatial. La taille des impacteursétant proche de celle des torons de fibres, les simulations mésoscopiques ont tout leurintérêt mais nécessitent des modèles numériques aboutis pour chaque sous-Constituant. Le graphiteétant souvent utilisé comme matrice ou fibres, nous avons étudié son comportement dynamique.Ainsi, des expériences de pénétration et de cratérisation ont été menées sur un isographite poreux.L’analyse post-Mortem des cibles, associée à des calculs d’ordre de grandeur, apporte un éclairagenouveau sur la phénoménologie des impacts et fournit des renseignements utiles à la simulationnumérique. Un modèle pour matériaux poreux et fragiles, implémenté dans un code de dynamiquerapide, est utilisé. Basé en partie sur des propriétés statiques, il a été progressivement testé sur deschocs plans. Son utilisation pour la simulation des IHV donne de bons résultats. Toutefois, il convenaitde le valider en s’affranchissant du comportement du projectile. Pour cela, une campagne dechocs lasers a été menée. Des diagnostics in-Situ ont été utilisés et leur corrélation avec des analysespost-Mortem a permis l’identification de différents modes d’endommagement des cibles. Finalement,bien que l’équivalence entre IHV et chocs lasers ne soit pas démontrée, ces derniers se sont montréscomplémentaires en suggérant de futures évolutions du modèle numérique.Composite materials are widely used in various applications and may be submittedto hypervelocity impacts (HVI), such as in the aerospace field. The size of the impactors beingclose to that of a strand of fibers, mesoscopic simulations are of great interest but they need reliablenumerical models for each meso-Constituent. Graphite often being used as fiber or matrix,we studied its dynamic behavior. Penetration and craterization experiments have been conductedonto porous isotropic graphite. Post-Mortem analysis of targets, associated to order-Of-Magnitudecalculations, sheds a new light on the phenomenology of impacts and brings useful informationfor numerical simulation. A model for porous and brittle materials, implemented into a hydrocode,is used. Partially based on static mechanical properties, it has been progressively tested on planeshocks. Its use for simulating HVI gives satisfying results. Nevertheless, it was necessary to validateit by disregarding the projectile behavior. In that purpose, a campaign of laser-Driven shocks hasbeen conducted. In-Situ diagnostics have been simultaneously used and their correlation with postmortemanalysis allowed the identification of different damaging regimes of the targets. Finally,although the equivalence between HVI and laser-Driven shocks is not proved, the latter turned outto be complementary, suggesting the future evolutions of the numerical model
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
Etude expérimentale et théorique de l'endommagement du graphite sous sollicitation dynamique - Application aux impacts hypervéloces
No full textComposite materials are widely used in various applications and may be submittedto hypervelocity impacts (HVI), such as in the aerospace field. The size of the impactors beingclose to that of a strand of fibers, mesoscopic simulations are of great interest but they need reliablenumerical models for each meso-Constituent. Graphite often being used as fiber or matrix,we studied its dynamic behavior. Penetration and craterization experiments have been conductedonto porous isotropic graphite. Post-Mortem analysis of targets, associated to order-Of-Magnitudecalculations, sheds a new light on the phenomenology of impacts and brings useful informationfor numerical simulation. A model for porous and brittle materials, implemented into a hydrocode,is used. Partially based on static mechanical properties, it has been progressively tested on planeshocks. Its use for simulating HVI gives satisfying results. Nevertheless, it was necessary to validateit by disregarding the projectile behavior. In that purpose, a campaign of laser-Driven shocks hasbeen conducted. In-Situ diagnostics have been simultaneously used and their correlation with postmortemanalysis allowed the identification of different damaging regimes of the targets. Finally,although the equivalence between HVI and laser-Driven shocks is not proved, the latter turned outto be complementary, suggesting the future evolutions of the numerical model.Les matériaux composites sont très utilisés dans diverses applications et sont parfoissoumis à des impacts hypervéloces (IHV), notamment dans le domaine spatial. La taille des impacteursétant proche de celle des torons de fibres, les simulations mésoscopiques ont tout leurintérêt mais nécessitent des modèles numériques aboutis pour chaque sous-Constituant. Le graphiteétant souvent utilisé comme matrice ou fibres, nous avons étudié son comportement dynamique.Ainsi, des expériences de pénétration et de cratérisation ont été menées sur un isographite poreux.L’analyse post-Mortem des cibles, associée à des calculs d’ordre de grandeur, apporte un éclairagenouveau sur la phénoménologie des impacts et fournit des renseignements utiles à la simulationnumérique. Un modèle pour matériaux poreux et fragiles, implémenté dans un code de dynamiquerapide, est utilisé. Basé en partie sur des propriétés statiques, il a été progressivement testé sur deschocs plans. Son utilisation pour la simulation des IHV donne de bons résultats. Toutefois, il convenaitde le valider en s’affranchissant du comportement du projectile. Pour cela, une campagne dechocs lasers a été menée. Des diagnostics in-Situ ont été utilisés et leur corrélation avec des analysespost-Mortem a permis l’identification de différents modes d’endommagement des cibles. Finalement,bien que l’équivalence entre IHV et chocs lasers ne soit pas démontrée, ces derniers se sont montréscomplémentaires en suggérant de futures évolutions du modèle numérique
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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