1,720,993 research outputs found
Predicting the evolution of dislocation density following hot deformation
No full textA model to predict the evolution of dislocation density following hot deformation is presented in this article. The model is validated by stress relaxation experiments on austenite at various temperatures. It is found that the activation energy for self-diffusion is the rate-controlling parameter determining the evolution of dislocation density, and hence the recovery rate. A methodology to control the softening experienced by high-temperature alloys is proposed.</p
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
Rupture par clivage de microstructures d'aciers bainitiques obtenues en conditions de soudage
No full textLa fragilité reconnue des Zones Affectées par la Chaleur (ZAC) en doudage d'aciers micro-alliés à basse teneur en carbone est l'une des propriétés les plus pénalisantes pour l'application de ces nouveaux produits en environnement sévère. Cette étude vise à mieux comprendre les mécanismes d'amorçage et de propagation de la rupture par clivage dans ces microstructures et à prévoir l'effet des zones fragiles sur la ténacité de l'acier. Les traitements thermiques correspondant à des cycles de soudage détériorent les propriétés à rupture du métal de base en élevant la température de transition fragile-ductile. Les propriétés de ténacité des ZAC (résilience et déformation à rupture sur éprouvettes entaillées) sont en effet fortement influencées par des paramètres métallurgiques tels que les composés Martensite-Austénite (M-A) et la taille de grain "efficace". La disposition d'ensemble des grains et de leurs orientations relatives qui déterminent les propriétés mécaniques de ces microstructures est fixée par les mécanismes de germination et de croissance de la bainite. Une approche phénoménologique de la cristallographie des transformations martensitiques (PTMC) est appliquée aux microstructures bainitiques et premert de préciser le rôle de l'auto-accommodation des contraintes mécaniques dans les mécanismes de formation de ces différentes microstructures. L'étude des micro-mécanismes de rupture des ZAC a été facilitée par l'utilisation de l'émission acoustique. Des amorces de rupture fragile par clivage sur des composés M-A massifs ont pu etre observées. Le type d'endommagement (rupture du composé ou décohésion à l'interface) dépend de la température d'essai et du taux de triaxialité. Par ailleurs, il semble que la résistance des barrières microstructurales (joints de paquets bainitiques) décroit quand la température diminue entrainant un changement de mécanisme : rupture controlée par la propagation à haute température, rupture controlées par l'amorcage à basse température. Dans le premier cas, les joints sur lesquels s'arretent les fissures sont déterminés par EBSD comme étant des joints de forte désorientation (50° à 60°).Le modèle d'approche locale de Beremin a été appliqué avec succès pour prédire les évolutions de la ténacité et de la dispersion avec la température. Un modèle d'approche locale basé sur les mécanismes de rupture des ZAC a été également appliqué. La rupture est décirte par la succession de trois processus élémentaires : rupture d'un composé M-A, franchissement de l'interface M-A/matrice et franchisement des joints de paquets efficves. La dispersion expérimentale, directement issue des distributions de tailles des différentes unités microstructurales est correctement reproduite. La prise en compte des effets de plasticité en pointe de fissure permet également de rendre compte de l'augmentation du nombre de fissures arretées avec la temperature, ce qui est expérimentalement observé
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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