1,721,039 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
On the Characterization of Wind Profiles Generated by Road Traffic
No full textThis paper analyses the flow field and the power wasted by a heavy-duty truck of modified GTS standard shape (equivalent to GCM class 8). Computational fluid dynamics has been used to analyze truck models at cruise conditions. The selected test matrix includes the study of an isolated truck and of a train of two and three trucks to evidence interaction effects. For each case three different velocities have been considered. The numerical campaign is able to quantify the drag coefficient distribution, the losses generated on the roof by viscous phenomena and the changes in velocity distributions. An in-situ experimental campaign is also settled in the truck lane of Venice highway using ultrasonic anemometers and video cameras set on the same measurement frame. Non-dimensional velocity distributions along the vehicle confirm that the height of the separation bubble is dependent on the number of trucks
Indications and limits of palliative resection for gastric cancer: our experience.
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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
On the ground-vehicle induced flows and obstacle interaction for energy harvesting purposes
No full textCFD simulations were conducted with the aim of studying the flow field induced by a road vehicle moving at high speed for energy harvesting purposes. 2D and 3D approaches were used and focus was put on the interaction between the vehicle and an obstacle placed upon the road simulating the shape of a generic harvesting device. 2D RANS simulations have proved that a separated region forms and that a trailed flow exists upon the vehicle which thickness do not exceed 1.1 times the vehicle height. The presence of trailing vehicles was analyzed and the raising of the separation region evaluated. The 3D steady approach showed that 2D modeling did not adequately predict velocity and pressure values even if general trends were captured. Different panel shapes were then compared to assess the effect of placing an obstacle near the moving vehicle. 2D URANS simulations suggested that to overcome an obstacle placed 1 m above the vehicle roof, an energy boost is required, while 3D unsteady calculations showed negligible variations in the vehicle's drag with approaching the obstacle. Furthermore, simulation of the full 3D domain allowed to identify forces time-histories and loading directions acting on a circular cylinder, with definition of an equivalent uniform velocity to characterize the flow impinging on the obstacle. Results showed that force coefficients and equivalent velocity maximums locate in the vehicle nose region, where inviscid-like effects dominates
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
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