1,721,865 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
Fruit trait segregation in a peach cross between distant genotypes
No full textA cross between distant genotypes was performed to introgress novel traits from a wild type peach into commercial cultivars. ‘PI 91459’, an ornamental-like peach (Rutgers University, NJ, USA) was chosen as the female parent for its weeping tree growth and long fruit peduncle. This trait would lessen the possibility of contact between the branch and the fruit during final swell, resulting in possible skin damage at harvest. ‘Bounty’, a yellow peach was chosen as a male for its large fruit size, since the female parent bears very small fruits. Ten seedlings out of the fifteen-tree progeny were randomly selected to measure branch crotch angle, fruit mass and peduncle length. On average, the fruit mass of the progeny was 43% larger than that of the seed parent. The fruit peduncle was 30% longer in the female as compared to the male parent. The progeny mean was close to mid-parent mean. Half of the seedlings had a penduncle length similar to that of the seed parent which may indicate a Mendelian mechanism of inheritance. The crotch angle was 80°, larger than either parent, conferring a wide spreading growth habit to the tree
Peach breeding for growth habit
No full textPeach clones of columnar, weeping, and standard tree growth and their progenies were studied to evaluate the possibility of manipulating tree form through breeding. Branch angle measured as the virtual angle formed by the stem and a line extending from the base of oneyear old branch to its tip was found to be a more reliable parameter in characterizing the tree form in peach than the actual crotch angle measured at the base of the branch since the shape of the crown is more closely related to the former angle. Intercrossing phenotypes with different branch angle can be used as a strategy to produce tree forms adapted to specific training systems, thus allowing for better orchard management. The weeping trait was found not completely recessive as formerly reported
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