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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
Variations 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
Rotenone for Varroa destructor control: effectiveness in field trials
No full textTwo field trials were performed in an experimental apiary of Apis mellifera L. Langstroth hives in Miramar (Argentina) during spring (Sept.-Nov. 2001) and autumn/winter (Jun-Jul 2002), to evaluate the effectiveness of rotenone impregnated in polyvinyl chloride strips against Varroa destructor (Anderson & Trueman). Colonies were standardized for consistency of adult bee population, brood combs and food storage. In spring, a group of 10 colonies received 1.2 g of rotenone/hive (0.6 g/strip). Another group of 10 colonies received 0.8 g of rotenone/hive (0.4 g/strip). Five colonies were left untreated. In autumn/winter, a group of 10 colonies received 0.8 g of rotenone/hive, while 7 colonies were left untreated. During the assay, female adult mites collected at the bottom of each hive were counted three times per week. After twenty days, all strips were removed and fluvalinate and oxalic acid miticides were applied, to determine the mites remaining in each hive. Rotenone effectiveness was evaluated by the percent efficacy (E%) and the percent control (C%), according to Abbott’s formula. Efficacies of 79.2 and 82.7 per cent for the spring and autumn/winter treatments, respectively, were observed. Bee mortality ranged between 10 and 20 per cent. A single treatment of 0.8 g of rotenone/hive was enough to control Varroosis and represents a promising alternative for beekeepers
New experimental data on use of rotenone as an acaricide for control of Varroa destructor in honey bee colonies
No full textRelationship between flowerings, honeybee colony development and honey production in a Mediterranean sylvo-pastoral system
No full textManejo orgánico de la varroosis en colonias de abejas con presencia de cría permanente
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