1,721,161 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
Aero-thermal performance investigation of an internal cooling channel with high blockage ratio
No full textExperimental analysis of the velocity field inside a turbine blade cooling channel by means of particle image velocimetry
No full textExperimental Investigation of the aerothermal performance of a high blockage rib-roughened cooling channel
No full textThe present study deals with a detailed experimental investigation of the turbulent flow
inside a rib-roughened turbine blade cooling channel. The measurements are carried out
in a stationary straight channel with high blockage ribs installed on one wall. The main
objective is to enhance the understanding and deepen the analysis of this complex flow
field with the help of highly resolved particle image velocimetry measurements. A quasithree-
dimensional view of the flow field is achieved, allowing the identification of the
main time-averaged coherent structures. The combined analysis of the present aerodynamic
results with available heat transfer data emphasizes the role of the mean and
fluctuating flow features in the heat transfer process. In particular, the stream wise/
normal to the wall component of the Reynolds stress tensor is shown to be strictly related
to the heat transfer rate on the channel surfaces. A correlation to estimate the heat
transfer field from the aerodynamic data is presented for the high blockage rib roughened
channel flow
Combined heat transfer and flow fields analysis in rib-roughened cooling passages for turbine blades
No full textThe present study deals with a detailed experimental investigation of the turbulent flow inside a rib-roughened turbine blade cooling channel. The measurements are carried out by means of a 2D PIV technique in a stationary straight channel with 10% blockage ribs installed on one wall. They constitute the necessary complement to the already available heat transfer data. The present aerodynamic results are compared with available data on a similar channel but with a blockage ratio of 30 %. The main objective is to deepen the analysis and enhance the understanding of this complex flow field, particularly with respect to the definition of a mean flow model and to its aero-thermal characteristics. More precisely, the stream-wise/normal to the wall component of the Reynolds stress tensor is shown to be closely related to the heat transfer rate on the channel surfaces. A correlation to estimate the heat transfer field from the aerodynamic data, previously obtained for the high blockage rib roughened channel flow, is validated for this 10% blockage configuration
Combined heat transfer and flow field analysis in rib-roughened cooling passages for turbine blades
No full textThe present study deals with a detailed experimental investigation of the turbulent flow inside a rib-roughened turbine blade cooling channel. The measurements are carried out by means of a 2D PIV technique in a stationary straight channel with 10% blockage ribs installed on one wall. They constitute the necessary complement to the already available heat transfer data. The present aerodynamic results are compared with available data on a similar channel but with a blockage ratio of 30 %. The main objective is to deepen the analysis and enhance the understanding of this complex flow field, particularly with respect to the definition of a mean flow model and to its aero-thermal characteristics. More precisely, the stream-wise/normal to the wall component of the Reynolds stress tensor is shown to be closely related to the heat transfer rate on the channel surfaces. A correlation to estimate the heat transfer field from the aerodynamic data, previously obtained for the high blockage rib roughened channel flow, is validated for this 10% blockage configuration
Aero-thermodynamic performance investigation of a rib roughened cooling channel flow with high blockage ratio
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