1,721,032 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
Structural, electronic and energetic properties of self-interstitial clusters in GaAs by tight-binding molecular dynamics
No full textIntrinsic interstitials in GaAs are characterized by a remarkable formation energy that makes them unlikely to be present in as-grown materials and therefore commonly neglected. However, the role of interstitials must be considered in implanted GaAs, where collision cascades by energetic ions produce a large amount of these
point defects. This paper reports on semiempirical tight-binding molecular dynamics simulations of interstitial defects in GaAs. The adopted parametrization has been initially applied to the simulation of isolated selfinterstitials, on the basis of previous state of the art density-functional theory results, showing good performances.
Then di-interstitial properties have been addressed, showing that self-interstitials have a remarkable tendency to aggregate in bigger structures. The binding energy of these clusters has been calculated on the basis of a simple algebraic model that does not require the calculation of the formation energy of the compound.
This work will lay the ground work for a subsequent study of larger aggregates
High resolution electron microscopy of Zn – and Bi – related superlattices in ion implanted (100) Si
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