1,721,004 research outputs found
Contributo alla conoscenza delle specie di mosche presenti negli allevamenti dei bovini dell'Italia meridionale
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Presenza di Tachygonetria longicollis (Schneider, 1866). in un gruppo di Testudo hermanni importate clandestinamente in Italia
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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
Numerical comparison between a simplified method and a full CFD approach for sonic boom evaluation on supersonic innovative configurations
No full textIn this paper the comparison between two different numerical approaches for sonic boom evaluation is presented: one is based on the Carlson method, the other is based on CFD computations and both are aimed to evaluate the ground signature due to a supersonic flight. The Carlson’s method is a simplified method for the calculation of sonic-boom characteristics for a wide variety of supersonic airplane configurations and spacecraft operating at altitudes up to 76 km. Sonic-boom overpressures and signature duration may be predicted for the entire affected ground area for vehicles in level flight or in moderate climbing or descending flight paths and the prediction requires in input the geometry of airplane and the operative conditions. A classical, more general approach for the sonic boom analysis is based on solution of the aerodynamic field in the vicinity of the aircraft, evaluation of the pressure disturbance far field propagation and prediction of the ground acoustic signature from the effective sonic boom perceived annoyance. These two methods have been used for sonic boom evaluation on a conventional reference supersonic geometry: the ground signature has been obtained and the comparison has shown a reasonable numerical agreement under some physical conditions. The paper shows the technical aspects of two before mentioned different approaches with special regard to the computational effort needed, low for the simplified Carlson’s method, high for CFD approach, and the numerical reliability of the solution
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