1,721,166 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
Granulation and suspension rheology: a unified treatment
No full textMixing a small amount of liquid into a powder can give rise to dry-looking granules; increasing the amount of liquid eventually produces a flowing suspension. We perform experiments on these phenomena using Spheriglass, an industrially-realistic model powder. Drawing on recent advances in understanding friction-induced shear thickening and jamming in suspensions, we offer a unified description of granulation and suspension rheology. A ‘liquid incorporation phase diagram’ explains the existence of permanent and transient granules and the increase of granule size with liquid content. Our results point to rheology-based design principles for industrial granulation.Hodgson, Daniel JM; Hermes, Michiel; Blanco, Elena; Poon, Wilson CK. (2019). Granulation and suspension rheology: a unified treatment, [dataset]. University of Edinburgh. School of Physics and Astronomy. Institute for Condensed Matter and Complex Systems. https://doi.org/10.7488/ds/2588
Liquid Migration in Shear Thickening Suspensions Flowing through Constrictions
No full textDense suspensions often become more dilute as they move downstream through a constriction. We find that as a shear-thickening suspension is extruded through a narrow die and undergoes such liquid migration, the extrudate maintains a steady concentration, independent of time or initial concentration. At low volumetric flow rate Q, this concentration is a universal function of Q/r^3, a characteristic shear rate in the die of radius r, and coincides with the critical input concentration for the onset of liquid migration. We predict this function by coupling the Wyart-Cates model for shear thickening and the 'suspension balance model' for solvent permeation through particles.O'Neill, Rory E; Royer, John R; Poon, Wilson CK. (2019). Liquid Migration in Shear Thickening Suspensions Flowing through Constrictions, [dataset]. University of Edinburgh. School of Physics and Astronomy. https://doi.org/10.7488/ds/2617
Force chains and networks: wet suspensions through dry granular eyes
No full textRecent advances in shear-thickening suspension rheology suggest a relation between (wet) suspension flow below jamming and (dry) granular physics. To probe this connection, we simulated the contact force networks in suspensions of non-Brownian spheres using the discrete element method (DEM), varying the particle friction coefficient and volume fraction. We find that force networks in these suspensions show quantitative similarities to those in jammed dry grains. As suspensions approach the jamming point, the extrapolated volume fraction and coordination number at jamming are similar to critical values obtained for isotropically compressed spheres. Similarly, the shape of the distribution of contact forces in flowing suspensions is remarkably similar to that found in granular packings, suggesting potential refinements for analytical mean field models for the rheology of shear thickening suspensions.Radhakrishnan, Rangarajan; Royer, John R; Poon, Wilson CK; Sun, Jin. (2019). Force chains and networks: wet suspensions through dry granular eyes, [dataset]. University of Edinburgh. School of Engineering
Dataset for: "A combined rheometry and imaging study of viscosity reduction in bacterial suspensions"
No full textDataset supporting the manuscript "A combined rheometry and imaging study of viscosity reduction in bacterial suspensions" accepted in PNAS.Martinez, Vincent; Clement, Eric; Arlt, Jochen; Douarche, Carine; Dawson, Angela; Schwarz-Linek, Jana; Creppy, Adama; Skultety, Viktor; Morozov, Alexander; Auradou, Harold; Poon, Wilson. (2020). Dataset for: "A combined rheometry and imaging study of viscosity reduction in bacterial suspensions", [dataset]. University of Edinburgh. School of Physics and Astronomy. Institute for Condensed Matter and Complex Systems. https://doi.org/10.7488/ds/2748
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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