1,722,435 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
Glocken opfern : Médailles et décorations / Ball, R.
No full textAppartient à l’ensemble documentaire : BNUStras1Appartient à l’ensemble documentaire : BNUStr01
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
Shear-band formation in a non-Newtonian fluid model with a constitutive instability
No full textWe examine the behaviour in shear of a viscoelastic fluid model (Johnson-Segalman fluid plus a Newtonian contribution) which exhibits a constitutive instability with respect to shear banding. Because there is a range of stress values at which shear bands can coexist, it is not clear which value of the stress is attained at a given, nominal shear rate, nor whether a selection of some particular value for the stress throughout the unstable range of shear rates exists or not. In this paper, at least for the specific fluid considered, we show that (i) a phase-separated flow actually occurs, and (ii) a selection mechanism for the stress in the shear-banded regime does exist. To obtain these clear-cut results, we used the Couette concentric cylinder geometry, where a ‘seed’ for the phase separation is automatically provided by the curvature: the portion of the material which is near to the inner (moving) cylinder is more strongly sheared than any other portion, and can induce the formation of a high shear rate band. At steady state, the existence of a selection mechanism for the stress implies that the ‘volume fraction’ of the high shear rate phase (not its shear rate) increases by increasing the velocity of the moving cylinder. These and other features of our computed solutions resemble experimental observations. We conclude the paper by showing how a simple variational reasoning can help in locating the selected stress
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