1,720,961 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
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
Étude expérimentale du comportement mécanique de matériaux 2D sur substrats sous contrainte : cas du MoS₂
No full textLe but de cette thèse est d'étudier la réponse mécanique des films ultra-minces de MoS₂ à la contrainte de compression et de déterminer si la théorie de flambage des films minces peut s’appliquer aux matériaux 2D. Les films minces de MoS₂ sont transférés de leurs substrats de croissance au substrat de polyéther-éther-cétone dans l'eau à l'aide d'un processus d'ultrasonication où aucun revêtement sacrificiel n'est utilisé. Les échantillons sont déformés en imposant une déformation uni-axiale sur les substrats. La réponse concomitante du film sous la forme de rides droites a été observée et caractérisée par microscope à force atomique in-situ. La propagation et l'interaction des rides observées sont en accord avec les rides de films minces métalliques sous compression. Le module d’Young du film contraint a été déterminé en tirant parti des dépressions observées sur les bords des rides. L'évolution du cloquage est étudiée dans le cadre des équations de Föppl–von Kármán modifiés où l'influence de l'élasticité du substrat est prise en compte. Une comparaison des résultats expérimentaux avec le modèle Föppl–von Kármán révèle une augmentation de la déflexion maximale de la structure de cloquage des films contraints. La différence a été reliée au déplacement du film par rapport au substrat qui est imposé par le glissement et le cisaillement à la frontière entre la partie plane du film et la ride. Ce déplacement augmente à mesure que la compression appliquée sur le substrat augmente. et a également été lié à la réduction progressive de l'efficacité du transfert de contrainte du substrat au film dans sa partie plane. La contrainte de flambage critique élevée observée qui est liée à l'adhérence du film au substrat est discutée. Enfin, l'énergie d'adhésion du système film/substrat est déterminée à partir des paramètres de morphologiques des cloquages.The purpose of this thesis is to investigate the mechanical response of ultrathin MoS₂ films to compressive strain and determine if the buckling theory of thin plates can be extended to extremely thin 2D materials. MoS₂ thin films are transferred from their growth substrates to polyether-ether-ketone substrate through a homemade technique where no sacrificial coating is used. Samples are deformed by imposing uniaxial strain on the substrates. The concomitant response of the film in the form of straight-sided buckles has been observed and characterised by in-situ atomic force microscope. Propagation and interaction of the straight-sided buckles are compared and found to be in good agreement with straight-sided buckles of thin metallic plates under compression. The Young’s modulus of the strained film has been determined by taking advantage of depressions observed at the edges of the buckles. The evolution of the buckles is studied in the frame-work of modified Föppl–von Kármán equations where the influence of substrate elasticity is considered. A comparison of experimental results with the theoretical model reveals an increase in maximum deflection of the buckling structures. The difference has been linked to the displacement of the film with respect to the substrate which is imposed by the sliding and shearing at the boundary of the flat film that pushes on the buckle. This displacement increases as the applied compression on the substrate increases and has also been linked to the gradual reduction of strain transfer efficiency from the substrate to the film. The observed high critical buckling strain which is linked to the adhesion of the film to the substrate is discussed. Finally, the adhesion energy of the film/substrate system is determined from the morphological buckle parameters
Étude expérimentale du comportement mécanique de matériaux 2D sur substrats sous contrainte : cas du MoS₂
No full textThe purpose of this thesis is to investigate the mechanical response of ultrathin MoS₂ films to compressive strain and determine if the buckling theory of thin plates can be extended to extremely thin 2D materials. MoS₂ thin films are transferred from their growth substrates to polyether-ether-ketone substrate through a homemade technique where no sacrificial coating is used. Samples are deformed by imposing uniaxial strain on the substrates. The concomitant response of the film in the form of straight-sided buckles has been observed and characterised by in-situ atomic force microscope. Propagation and interaction of the straight-sided buckles are compared and found to be in good agreement with straight-sided buckles of thin metallic plates under compression. The Young’s modulus of the strained film has been determined by taking advantage of depressions observed at the edges of the buckles. The evolution of the buckles is studied in the frame-work of modified Föppl–von Kármán equations where the influence of substrate elasticity is considered. A comparison of experimental results with the theoretical model reveals an increase in maximum deflection of the buckling structures. The difference has been linked to the displacement of the film with respect to the substrate which is imposed by the sliding and shearing at the boundary of the flat film that pushes on the buckle. This displacement increases as the applied compression on the substrate increases and has also been linked to the gradual reduction of strain transfer efficiency from the substrate to the film. The observed high critical buckling strain which is linked to the adhesion of the film to the substrate is discussed. Finally, the adhesion energy of the film/substrate system is determined from the morphological buckle parameters.Le but de cette thèse est d'étudier la réponse mécanique des films ultra-minces de MoS₂ à la contrainte de compression et de déterminer si la théorie de flambage des films minces peut s’appliquer aux matériaux 2D. Les films minces de MoS₂ sont transférés de leurs substrats de croissance au substrat de polyéther-éther-cétone dans l'eau à l'aide d'un processus d'ultrasonication où aucun revêtement sacrificiel n'est utilisé. Les échantillons sont déformés en imposant une déformation uni-axiale sur les substrats. La réponse concomitante du film sous la forme de rides droites a été observée et caractérisée par microscope à force atomique in-situ. La propagation et l'interaction des rides observées sont en accord avec les rides de films minces métalliques sous compression. Le module d’Young du film contraint a été déterminé en tirant parti des dépressions observées sur les bords des rides. L'évolution du cloquage est étudiée dans le cadre des équations de Föppl–von Kármán modifiés où l'influence de l'élasticité du substrat est prise en compte. Une comparaison des résultats expérimentaux avec le modèle Föppl–von Kármán révèle une augmentation de la déflexion maximale de la structure de cloquage des films contraints. La différence a été reliée au déplacement du film par rapport au substrat qui est imposé par le glissement et le cisaillement à la frontière entre la partie plane du film et la ride. Ce déplacement augmente à mesure que la compression appliquée sur le substrat augmente. et a également été lié à la réduction progressive de l'efficacité du transfert de contrainte du substrat au film dans sa partie plane. La contrainte de flambage critique élevée observée qui est liée à l'adhérence du film au substrat est discutée. Enfin, l'énergie d'adhésion du système film/substrat est déterminée à partir des paramètres de morphologiques des cloquages
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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