1,720,965 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
Structures poreuses tridimensionnelles de biopolymères pour l'ingénierie tissulaire
No full textFunctional three-dimensional porous scaffolds possess a high potential in many biomedical applications. We have thus oriented our work toward the elaboration of new materials able to meet several criteria for bone tissue engineering. Due to their renewability, their biocompatibility, and their biodegradability, poly(3-hydroxyalkanoate)s (PHAs) exhibit properties particularly suitable for this type of application. First, we have developed novel controlled strategies that are rapid and straightforward for the synthesis of PHA-based block copolymers as well as for the production of oligoesters upon microwave activation. Moreover, the absence of “non-thermal” microwave effect in the ring-opening polymerization of D,L-lactide was also demonstrated through a systematic investigation. Second, the elaboration of miscellaneous three-dimensional nanofibrous materials by electrospinning has been performed to produce PHA-based frameworks with different morphologies through the formation of fibers in a wide range of diameters or with controlled surface topography (nanopores or channels). Several strategies for surface functionalization have also been implemented, such as the deposition of hydroxyapatite nanoparticles by an original combination of the electrospinning and electrospraying techniques or by the co-electrospinning of gelatin. New approaches toward covalent coupling of molecules on the PHA fiber surface by “click” chemistry or by ring-opening of previously introduced epoxide groups have also been developed. Lastly, in-vitro biological investigations have highlighted the potential of these new nanofibrous materials as cell culture supports through the evaluation of the adhesion, proliferation, and differentiation of pluripotent human mesenchymal stem cells (hMSCs) toward an osteoblastic phenotypeLes structures poreuses tridimensionnelles fonctionnelles possèdent un fort potentiel dans de nombreuses applications biomédicales. Nous avons ainsi orienté nos travaux vers l'élaboration de nouveaux matériaux capables de répondre à plusieurs critères pour l'ingénierie tissulaire osseuse. Du fait de leur biodisponibilité, leur biocompatibilité et leur biodégradabilité, les poly(3-hydroxyalcanoate)s (PHAs) présentent des propriétés particulièrement adaptées pour ce type d'application. Dans un premier temps, nous avons développé de nouvelles stratégies contrôlées, rapides et aisées, de synthèse de copolymères à blocs à base de PHAs ainsi que de production d'oligoesters par activation sous micro-ondes. Par ailleurs, l'absence d'effet « non-thermique » des micro-ondes sur la polymérisation par ouverture de cycles du D,L-lactide a également été démontrée grâce à une investigation systématique. Dans un second temps, l'élaboration de divers matériaux tridimensionnels nanofibreux par électrofilage (« electrospinning ») a été réalisée afin de fabriquer des structures à base de PHAs de différentes morphologies avec la formation de fibres dans une large gamme de diamètres ou encore avec des topographies de surface contrôlées (nanopores ou rainures). Plusieurs stratégies de fonctionnalisation superficielle ont été également mises au point telles que le dépôt de nanoparticules d'hydroxyapatite selon un procédé original couplant les techniques de l' « electrospinning » et de l' « electrospraying », ou encore le « co-electrospinning » de la gélatine. De nouvelles approches de couplage covalent de molécules en surface des fibres de PHAs par chimie « click » ou par ouverture de fonctions époxyde préalablement introduites ont également été développées. Enfin, des investigations biologiques in vitro ont permis de mettre en lumière les potentialités de ces nouveaux matériaux nanofibreux comme supports de culture cellulaire à travers l'évaluation de l'adhérence, la prolifération et la différentiation de cellules souches mésenchymateuses humaines (hMSCs) pluripotentes vers un phénotype ostéoblastiqu
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
porous three-dimensional structures of biopolymers for tissue engineering
No full textLes structures poreuses tridimensionnelles fonctionnelles possèdent un fort potentiel dans de nombreuses applications biomédicales. Nous avons ainsi orienté nos travaux vers l'élaboration de nouveaux matériaux capables de répondre à plusieurs critères pour l'ingénierie tissulaire osseuse. Du fait de leur biodisponibilité, leur biocompatibilité et leur biodégradabilité, les poly(3-hydroxyalcanoate)s (PHAs) présentent des propriétés particulièrement adaptées pour ce type d'application. Dans un premier temps, nous avons développé de nouvelles stratégies contrôlées, rapides et aisées, de synthèse de copolymères à blocs à base de PHAs ainsi que de production d'oligoesters par activation sous micro-ondes. Par ailleurs, l'absence d'effet « non-thermique » des micro-ondes sur la polymérisation par ouverture de cycles du D,L-lactide a également été démontrée grâce à une investigation systématique. Dans un second temps, l'élaboration de divers matériaux tridimensionnels nanofibreux par électrofilage (« electrospinning ») a été réalisée afin de fabriquer des structures à base de PHAs de différentes morphologies avec la formation de fibres dans une large gamme de diamètres ou encore avec des topographies de surface contrôlées (nanopores ou rainures). Plusieurs stratégies de fonctionnalisation superficielle ont été également mises au point telles que le dépôt de nanoparticules d'hydroxyapatite selon un procédé original couplant les techniques de l' « electrospinning » et de l' « electrospraying », ou encore le « co-electrospinning » de la gélatine. De nouvelles approches de couplage covalent de molécules en surface des fibres de PHAs par chimie « click » ou par ouverture de fonctions époxyde préalablement introduites ont également été développées. Enfin, des investigations biologiques in vitro ont permis de mettre en lumière les potentialités de ces nouveaux matériaux nanofibreux comme supports de culture cellulaire à travers l'évaluation de l'adhérence, la prolifération et la différentiation de cellules souches mésenchymateuses humaines (hMSCs) pluripotentes vers un phénotype ostéoblastiqueFunctional three-dimensional porous scaffolds possess a high potential in many biomedical applications. We have thus oriented our work toward the elaboration of new materials able to meet several criteria for bone tissue engineering. Due to their renewability, their biocompatibility, and their biodegradability, poly(3-hydroxyalkanoate)s (PHAs) exhibit properties particularly suitable for this type of application. First, we have developed novel controlled strategies that are rapid and straightforward for the synthesis of PHA-based block copolymers as well as for the production of oligoesters upon microwave activation. Moreover, the absence of “non-thermal” microwave effect in the ring-opening polymerization of D,L-lactide was also demonstrated through a systematic investigation. Second, the elaboration of miscellaneous three-dimensional nanofibrous materials by electrospinning has been performed to produce PHA-based frameworks with different morphologies through the formation of fibers in a wide range of diameters or with controlled surface topography (nanopores or channels). Several strategies for surface functionalization have also been implemented, such as the deposition of hydroxyapatite nanoparticles by an original combination of the electrospinning and electrospraying techniques or by the co-electrospinning of gelatin. New approaches toward covalent coupling of molecules on the PHA fiber surface by “click” chemistry or by ring-opening of previously introduced epoxide groups have also been developed. Lastly, in-vitro biological investigations have highlighted the potential of these new nanofibrous materials as cell culture supports through the evaluation of the adhesion, proliferation, and differentiation of pluripotent human mesenchymal stem cells (hMSCs) toward an osteoblastic phenotyp
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