1,720,963 research outputs found
Dépôt et caractérisation des nitrures de molybdène et MoN/CrN en multicouches par pulvérisation cathodique magnétron
No full text143 p. : ill. ; 30 cmLes nitrures des métaux de transition possèdent des propriétés physiques intéressantes dans le domaine de la micro-électronique, opto-électronique et la protection des pièces de l'usure, l'érosion et de l'oxydation. L'objectif de ce travail est d'élaboré et caractérisé les différentes propriétés mécaniques et structurales des films monocouches Mo-N, Cr-N et multicouches Mo2N/CrN déposé par pulvérisation cathodique magnétron. La structure et la microstructure des films été déterminées par la diffraction des rayon X (DRX), microscope électronique à balyage (MEB) et microscope à force atomique (AFM), les propriétés mécaniques sont déterminés par la nanoindentation et mesure de la courbure pour les contraintes résiduelles. Tout d'abord, l'optimisation des conditions de dépôts des films monocouches Mo-N et Cr-N a été effectuée, l'effet de ratio du gaz réactif N2 dans le plasma, l'influence de la température ainsi de la puissance. Les phases dominantes de ces couches minces sont Mo2N et CrN, les revêtements qui présentent de meilleure propriétés de dureté et de module d'Young sont utilisés pour l'élaboration des multicouches, (29, 341 GPa) et (17.5, 251 GPa) respectivement. Ensuite nous avons élaboré et caractérisé des films multicouches Mo2N/CrN à basse et à haute température, avec différentes épaisseur de la période ? ainsi du nombre d'interfaces. La comparaison entre les différentes propriétés des revêtements Mo2N, CrN et Mo2N/CrN nous a permis de conclure que les films multicouches possède des propriétés intermédiaire à celles des films les constituants. Une grande dureté et bon module d'Young 27.5 et 299 GPa repectivement, sont obtenus pour la période ?=10 nm. Une croissance cohérente traduit par la formation d'un superréseau à ?=5 n
Dépôt et caractérisation de nitrure de titane par pulvérisation cathodique magnétron
No full text48p. : ill. ; 30 cmLes nitrures des métaux de transition possèdent des propriétés physiques intéressantes dans le domaine de la micro-électronique, opto-électronique et la protection des pièces contre l’usure, l’érosion et l’oxydation. L’objectif de ce travail est d’élaboré et caractérisé les différentes propriétés structurales, morphologiques et mécaniques des revêtements TiN déposés par la technique de pulvérisation cathodique magnétron. La structure et la topographie des films étaient déterminées par la diffraction des rayons X (DRX) et le microscope à force atomique (AFM), les propriétés mécaniques sont déterminées par la micro-dureté Vickers. L’optimisation des conditions de dépôts des revêtements TiN été effectuée, l’effet de la concentration du gaz réactif N2 dans le plasma, ainsi que l’effet du substrat utilisé. Notre étude montrent une dureté élevée pour la petite taille de grain et à faible concentration d’azote
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
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
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
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