1,720,972 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
Effect of impinging jet angle and offset on the heat transfer characteristics of a liquid falling film on a rotating cylinder
No full textThe jet impingement on a horizontal rotating tube is widely used in various engineering applications. However, an uneven distribution of the liquid film on the rotating tube can substantially impact the hydrodynamic and heat transfer properties of the thin liquid film. Thus, this study employs 2-D numerical simulations using the Volume of Fluid method to investigate the hydrodynamics and thermal characteristics of a thin liquid film on a rotating cylinder, exploring the effects of rotational speeds, jet tilt angles, and offset distances. The numerical results reveal that with an increase in rotational speed, the location of the jet departure position shifted in the direction of the angular motion and the local heat transfer coefficient at the impingement zone significantly decreased. However, there is no substantial difference in the value with respect to the jet velocities investigated. Deviations in the jet impingement angle cause the liquid film thickness to increase on one side of the cylinder, however, the jet departure point does not alter significantly, emphasizing the governing role of rotational motion. Additionally, for a given rotational speed, there exists a critical jet offset distance beyond which the film experiences severe unsteadiness, particularly in the liquid film departure zone at the bottom side of the cylinder
Internal Flashing Flow of Ammonia
Full text linkAmmonia is considered a carbon-free alternative fuel for energy systems. Its low boiling point makes liquid ammonia prone to flash boiling, especially under standard temperature and pressure. The phase change occurs on a timescale similar to the nozzle’s flow-through time, requiring finite-rate modeling. This study presents a numerical simulation of internal flashing flow in superheated ammonia using a multidimensional thermal nonequilibrium model. The model was validated against experimental data, with simulations at two different back pressures showing a significant increase in vapor formation as back pressure decreased.<br/
Dispelling 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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