1,720,957 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
Effect of dipolar coupling on vortex states formed in dense chains of ferromagnetic rectangular particles
No full textWe have investigated the effects of dipolar coupling on the magnetization configurations of ferromagnetic rectangular particles with rounded-corners. Two arrays of particles with lateral size of 1025×450 nm2 have been patterned by deep UV lithography, followed by the lift-off of a permalloy film of thickness 40 nm. The first array consisted of long chains of interacting nanomagnets put head-to-tail, with 85 nm interdot spacing. In the second array the interdot distance was increased to 700 nm, in order to avoid any effect of dipolar interaction. In this sample the particles could be considered as magnetically isolated and their behavior as a reference for comparison with the interacting ones.
Magneto-optical Kerr effect (MOKE) and in-field magnetic force microscopy (MFM) experiments, together with micromagnetic simulations, were performed. MFM measurements clearly showed that closure states characterized by one, two or three vortices occurred in isolated particles at remanence, together with the vortex/antivortex/vortex state. MFM performed on the same particles with a field applied along their hard direction (fig. 1) showed the detail of the nucleation and propagation process of vortices in isolated dots, in particular for the single vortex and the vortex/antivortex/vortex states. Decreasing the field intensity from positive saturation the nucleation process starts at one end of the particle below 200 Oe. The vortices cores then propagate perpendicularly to the field along the dot’s major axis toward the opposite end of the particle where they annihilate.
When the field was applied along the major axis of interacting nanomagnets put head-to-tail the cooperation of intrinsic shape anisotropy and configurational anisotropy led to the formation of a regular sequence of single domain states (fig. 2), promoted by dipolar coupling, and the vortex formation was delayed during the reversal process. It turned out that the field range in which vortices exist is much narrower in the case of interacting particles if compared with isolated ones.
An interesting result was that dipolar interaction can suppress some magnetic configurations that are present in isolated nanomagnets and favour other states. In particular, the double vortex was not observed in interacting particles, whereas the vortex/antivortex/vortex structure was found to be largely the most probable spin arrangement. A simple explanation of these findings, based on energy balance consideration, will be proposed. This work was supported by the European Community's Seventh Framework Programme (FP7/2007-2013) under Grant Agreement n°228673 (MAGNONICS)
Magnetic configurations and magnetization reversal process in clusters of interacting submicrometric stadium-shaped dots
No full textDispelling 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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