1,720,974 research outputs found
Roadside particulate and trace element concentrations at four London sites
No full textMeasurements of black smoke (BS), total suspended particulates (TSP) and selected trace element concentrations were made at two locations (four sites) in London, UK. One location was in Ealing, West London, the other was in Wood Green, North London. At each location, a residential and commercial roadside site was identified and monitored. The black smoke measurements were taken over 24-hour periods via a British standard 8-port smoke sampler situated inside a mobile laboratory. The TSP measurements were taken during peak traffic periods and 24-hour periods using glass fibre filters and high volume sampling pumps. At one site (the residential site at Wood Green), the TSP samples were analysed for 17 elements Pb, Zn, Br, Mg, Al, V, Fe, Sb, Mo, Co, Ni, Cu, Mn, Cr, Ba, Sn and Pt. After gravimetric analysis, the trace elements were extracted from the filter papers and analysed using inductively coupled plasma-source mass spectrometry. Two methods of extracting the trace elements were investigated, and the most efficient technique, the "nitric-perchloric", was used. Quantitative determinations of BS were made for a total of 98 and 115 days at the Ealing and Wood Green locations respectively during 1991/92. The average concentrations determined at the residential locations were 18.3 (Ealing) and 20.5 (Wood Green) µg/m³, respectively, and for the commercial sites the corresponding values were 30.6 and 69.5 µg/m³. The daily TSP values at the four sites are also reported and compared with measurements taken during the morning and afternoon rush hours. The particulate values reported here are discussed and compared with previously reported measurements in the UK. A total of 55 filter papers from the residential site at Wood Green were extracted for trace element analysis and the results are reported. Sufficient samples were collected to allow the data to be divided into morning, afternoon and 24-hour time periods, allowing comparison of the trends with the TSP data. The total and individual contributions of the trace elements to the particulate mass have been calculated and the most abundant trace elements (Zn, Pb, Br, Fe, Al, Mg) identified
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
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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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