1,720,957 research outputs found
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Effects of microbial-induced calcium carbonate precipitation on settling and consolidation of tailings
No full textVariations on the Author
Get PDF“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
Get PDFWe 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
Assessing salt migration from compacted bauxite residual into overlying cover using an instrumented column
No full textA cover of an inert growth medium is required over compacted, seawater-neutralized bauxite residue. The cover has to be revegetated, and it is necessary to demonstrate that the potential evaporation-driven uptake of salts from the seawater-neutralized residue will not impact the revegetation. An instrumented column was constructed to test the evaporation-driven uptake of salts from the compacted residue into an overlying cover material under natural weather conditions. The PVC column is 1.2 m in height, and 200 mm in diameter, and was filled with 600 mm of compacted residue overlain by 600 mm of loose cover material. It is instrumented down its length with ten sets of moisture, suction, salinity, and temperature sensors, designed and manufactured at the University of Queensland (UQ). Two pressure transducers are installed in the column to monitor the change of water level due to rainfall and evaporation. The instrumented column is installed on a roof of a building at UQ, alongside weather stations, and has been subjected to prevailing weather conditions for over one year, during which weather conditions and sensor responses have been continuously monitored. This paper reports on the instrumented column set-up and the first year of results obtained from the test
Dispelling the Myths Behind First-author Citation Counts
Get PDFWe 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
Experimental and numerical analysis of a slurry consolidation test on tailings
No full textThe deposition of fine-grained tailings as a somewhat thickened slurry remains the norm, and presents challenges in the assessment of their geotechnical parameters and the analysis of their settling and consolidation behaviour. The conventional oedometer and Rowe cell consolidometer are not suitable for testing tailings from a slurry state. In this paper, silty sand-sized gold tailings of low plasticity are tested in an instrumented slurry consolidometer and their consolidation is simulated numerically. The purpose-built slurry consolidometer measures 150 mm in diameter and 410 mm in height, and is instrumented with top and base load cells, seven pore water pressure (PWP) transducers starting from the base and spaced at 40 mm intervals spirally up the side of the consolidometer, and a displacement transducer. Up to 560 kPa stress can be applied to the top of the sample, equivalent to about 60 m depth of tailings. The tailings were placed in the slurry consolidometer in a series of layers at an initial 25% solids concentration by mass, and each layer was allowed to settle and the surpernatant water removed before the next layer was placed. Stepwise loading was then applied, since this is the conventional means of loading in a consolidation test, and is the basis of the available numerical analysis software. The difference with the slurry consolidometer over conventional consolidation testing is that the test can commence from a slurry state and follow the largestrain consolidation process. The numerical simulation of a large-strain consolidation problem is challenging due to extreme mesh distortions during numerical calculations. The emerging and innovative material point method (MPM) was used to numerically simulate the consolidation of the tailings from a slurry state. The analysis was carried out using the code and software developed by the MPM Research Community, Anura3D, focussing on PWP dissipation and the resulting consolidation. This numerical approach captured the consolidation behaviour well and provided a reasonable match with the experimental results
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