1,720,961 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
Ibridizzazione nei Galliformi: successo riproduttivo degli incroci tra pernice rossa (Alectoris rufa) e pernice sarda (A. barbara)
No full textVariations 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
Molecular-genetic analysis of Alectoris partridge populations of the western Mediterranean islands
No full textLes espèces du genre Alectoris qui habitent la Méditerranée, c’est-à-dire la perdrix rouge (Alectoris rufa) (PR), la perdrix bartavelle (A. graeca), la perdrix gambra (A. barbara) (PG), et la perdrix choukar (A. chukar) (PC), sont incluses dans la liste des “Espèces d’intérêt européen pour la conservation” (SPEC), à cause de la sévère pression de chasse et de la pollution génétique. En effet, la pratique illégale du croisement artificiel parmi ces espèces, permet de produire des animaux hybrides plus prolifiques et forts. Du moment que la vente aussi que le change sont une pratique routinière entre les élevages et les maisons de chasse au cours des repeuplements, la pollution génétique des populations sauvages est désormais considérable, surtout à la frontière entre la France et l’Italie, et en Grèce. Au-dedans du projet Interreg III, qui vise à l’analyse génetico-moléculaire des perdreaux du genre Alectoris dans l’ensemble Corse-Toscane Livournaise, PRs de l’île de Pianosa (Parc National de l’Archipel Toscane, n = 14) aussi que de régions de haute montagne (Nessa-Feliceto, Lozzi, Reginu, Fium’Orbu-Taravu: n = 22) et d’élevage de la Corse (Carbuccia, n = 6), ont été étudiées avec des PGs aussi échantillonnées en Sardaigne, sur le territoire (provinces de Nuoro et Oristano: n = 4) et dans différentes élevages (Bonassai, Oliena, Monastir: n = 3). Le séquençage de l’entière Région de Contrôle (près de 1155 pb) et de la plupart du gène Cytochrome b (1092/1143 pb) de l’ADN mitochondriale, a montré la présence des lignes maternelles de la PR et de la PC dans les populations de Pianosa et de la Corse, tandis que la seule ligne de la PG a été trouvée en Sardaigne. L’analyse aux marqueurs RAPD (Random Amplified Polymorphic DNA), a montré que le 93% et 65% des individus échantillonnés à Pianosa et en Corse, respectivement, sont hybrides entre la PR et la PC, tandis que la population de PG n’a pas encore été analysée. Dans ce cadre général de diffuse pollution génétique, on peut affirmer que le génome naissant de la PR semble virtuellement disparu de la Méditerranée centrale. En plus, les résultats préliminaires reportés, démontrent que la Sardaigne représente une ressource de biodiversité qui paraît encore intègre. Donc, les populations sardes de PG devraient être mises sous contrôle pour permettre des repeuplements sûrs et sauver leur génome
Ulteriori osservazioni sulla presenza di cellule gangliari nei nervi oculogiri di mammiferi e pesci
No full textDispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
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