1,721,111 research outputs found
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
Ligne de détection des neutrons issus du réacteur VENUS
No full textVue du haut de la ligne de détection des neutrons issus du réacteur VENUS du SCK-CEN de Mol en Belgique dans le cadre du projet GUINEVERE
Mesure de la température maximale des résidus chauds émis dans la réaction Ar + Au à 60 MeV/u
No full textThe work carried out in this thesis relates to the formation and decay by evaporating light particules of hot heavy residue produced in the 60 MeV per nucléon Ar + Au reaction. Using DéMoN facility has allowed to measure the initial temperature and the evaporated neutron multiplicity associated with heavy residue. Hotest observed residues sustain a 6 MeV temperature, have a 1.0 cm/ns recoil velocity, évapore about 22 neutrons and are produced with a non negligible cross section (50 mbarn). All the characteristics of this residue production are in good agreement with the predictions of a BNV calculation coupled with a statistical decay code.Le travail présenté dans cette thèse porte sur l'étude de la formation et de la désexcitation par evaporation de particules légères des noyaux chauds, les résidus, formés dans les réactions Ar + Au à 60 MeV par nucléon d'énergie de bombardement. L'utilisation du nouvel ensemble de détection DéMoN a permis d'estimer l'énergie d'excitation supportée par ces noyaux chauds à travers la mesure d'une part de leur température initiale, d'autre part de la multiplicité de neutrons évaporés qui leur est associée. Les noyaux les plus chauds observés ont une température de 6 MeV, une vitesse de recul de 1.0 cm/ns, évaporent en moyenne 22 neutrons et ont une section efficace de production d'environ 50 mbarn. La comparaison des résultats expérimentaux avec les prédictions d'un code de type B.N.V a permis d'associer la production de ces résidus à des collisions binaires dissipatives et des paramètres d'impact intermédiaires
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