1,721,037 research outputs found
Detecting asbestos fibres and cleavage fragments produced after mechanical tests on ophiolite rocks. Clues for the asbestos hazard evaluation
Full text linkThe generation of particulate matter emitted by management (e.g., mining, crushing, grinding, and milling) of ophiolite rock masses induces environmental impact due to production and dispersion of fibrous particles, which can be potentially classifiable as asbestos. Accordingly, characteristics of particles generated after mechanical stress on rocks are preparatory features to evaluate the environmental impact due to the asbestos hazard. This study deals with the characteristics (in terms of size, morphology and mineral classification) of particles generated after application of three different mechanical stress procedures (i.e. crushing, micronizing, and abrasion) on five ophiolite lithotypes and a man-made material obtained from rock mixing. A petrographic investigation has been addressed to classify the rock samples in terms of their internal fabric (foliated vs massive) and to individuate textural locus of fibrous minerals within the rock mass. The application of mechanical tests reveal that all the investigated lithotypes resulted able to spread out fibres as a consequence of rock disaggregation, with a prevalent amount of liberated fibres coming from samples characterised by pervasive foliation. The combined use of transmission electron microscopy and particle size analyser has been addressed to analyse morphological properties of the particulate matter. Different counting criteria have been used to distinguish asbestos fibres and non-asbestos particles (cleavage fragments). The results show that the counting criteria adopted for the fibre classification led to divergent interpretations in differentiating asbestos fibres and cleavage fragments and to determine the amount of asbestos. It derives the importance to define univocal criteria to define particle as asbestiform for supporting procedures and normatives addressed to evaluate the asbestos hazard in environmental sites
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
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
Mitogenic and dedifferentiating effect of the K-fgf/hst oncogene on rat thyroid PC clone 3 epithelial cells.
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