1,721,041 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
Variations 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
Multi-element isotopic fingerprinting on aqueous-phase chloroethenes derived from chlorinated pitches
No full textCompound Specific Isotope Analysis (CSIA) is an effective tool in order to apportion the source of groundwater contamination. Isotopic signature may reflect the production process of a compound or the origin of raw materials used in the production. Nijenhuis et al. (2013) demonstrated that PCE and TCE, as by-products of the distillation of chloromethanes via thermal chlorination, show strongly depleted δ13C, with values ranging between -87 and -65‰ for PCE and between -79 and -64‰ for TCE. This finding was related to a field study in Northern Italy (Ferrara). In order to strengthen the investigation tool, the presented study involves a multi-element and multi-site approach by taking into account the same industrial process of chloromethanes production and nearby dumping in different sites (in charge of different producers and in different hydrogeological settings). In particular, the δ13C, δ37Cl and δ2H were analyzed in the molecules of PCE, TCE and 1,2 DCE dissolved in groundwater at two distinct locations in Italy. The existing fingerprinting of δ13C in Ferrara site was complemented by δ37Cl and δ2H analyzed in some selected boreholes from the previous survey. The second investigated site is known as the Bussi site (Central Italy). Contaminated groundwater was sampled at the two sites in two distinct sampling rounds, for a total of 30 boreholes (the second sampling round is being performed in 2017). The geological settings are different at the two sites: a large alluvial plain (Ferrara site) and a narrow valley with macroclastic alluvial deposits and travertines (Bussi site).
The following issues will be targeted during the presentation: can we apply the CSIA approaches for source apportionment in different hydrogeological settings with different potential producers of chlorinated aliphatic hydrocarbons (CAH)? Is it feasible to define a multi element fingerprinting for CAH derived from chlorinated pitches, and how does the fractionation of the different stable isotopes respond to production, dumping and biodegradation?
The research will show that the multi-isotope approach can help addressing liability of contamination events in urban and periurban areas, where the pattern of contaminant distribution and concentration in groundwater does not allow identification of the polluter.
References. Nijenhuis, I., Schmidt, M., Pellegati, E., Paramatti, E., Richnow, H.H., Gargini, A. 2013. A stable isotope approach for source apportionment of chlorinated ethenes plumes at a complex multi-contamination events urban site. Journal of Contaminant Hydrology, 153, 92–105
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
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
The contribute of the Italian hydrogeological community to the congress of the Italian Geological Society
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Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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