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Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Le traiettorie della fisica. Con e-book. Con espansione online. Per le Scuole superiori. Vol. 1: Meccanica
No full textLe traiettorie della fisica. Per le Scuole superiori. Con espansione online. Vol. 3: Elettromagnetismo, relatività e quanti
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A Cyclotron Based Solution for a BNCT Source
No full textThe present paper proposes and preliminarily discusses the possibility to produce thermal fluxes of sufficient intensity for BNCT (explanted liver and skin melanoma) and BNCS (rheumatoid arthritis), using commercial cyclotrons conceived for radioisotopes production. Application of BNCT to the treatment of liver and melanoma require a thermal neutron fluence of about 5 10E12 cm-2, that correspond to a thermal fluence rate of the order of about 1.5 10E09 cm-2 s-1 for one hour irradiation. In the case of BNCS about 5 10E11 cm-2 are required, that correspond to a thermal fluence rate of the order of about 10E9 cm-2 s-1 for 10 minutes irradiation. Purpose of this preliminary study is to verify the current requirements to obtain the needed thermal fluence rate. This study is necessary before proceeding to the optimisation of the moderating structure and to the experimental tests
Le traiettorie della fisica. Per le Scuole superiori. Con espansione online. Vol. 2: Termodinamica, onde
No full textVariations on the Author
Get PDF“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
Get PDFWe 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
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