1,721,067 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
Chapter 1 - High-pressure torsion and equal-channel angular pressing
No full textIn this chapter, the main peculiarities of ultrafine-grained (UFG) structure formation in commercially pure Ti is examined when processing by high-pressure torsion (HPT) or equal-channel angular pressing (ECAP). High-pressure torsion is used to produce Ti with extremely small grain sizes (generally < 100 nm). The ECAP technique was developed in the 1990s by R.Z. Valiev and coauthors and successfully used to produce UFG structures in bulk billets of pure Ti. Recently, this technique was further developed and a number of modifications of the technique have been proposed, including continuous ECAP or ECAP-Conform which enables the production of long-length rods (up to 1 m)
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
THE DISLOCATION-GRAIN BOUNDARY INTERACTION AND ITS EFFECT ON THE BOUNDARY DYNAMIC PROPERTIES
No full textThe problem of the interaction of dislocations with grain boundaries is discussed on the basis of the concept of grain boundary non-equilibrium state generation and recovery. According to this concept, trapped lattice dislocations, being non-equilibrium defects, are absorbed by the boundaries as they dissociate into grain boundary dislocations which are then rearranged into equilibrium configurations. During the absorption of lattice dislocations, grain boundaries are shown to be in an non-stationary, excited state, which causes an abrupt acceleration of some of the grain boundary dynamic process such as diffusion, migration, and sliding
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