1,721,002 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
Indagini epidemiologiche sulla ascaridiosi del suino
No full textA survey was carried out on swine ascaridiasis in a slaughterhouse of the Province of Cremona during two years. Among 90000 fattened pigs, 3.2% were found positive for A. suum. The highest prevalence was recorded in autumn (3.7%), the lowest in spring (2.7%). Lack of recurrent disinfections, of climatization, of all-in, all-out policy are associated with higher prevalences
Swine ascariasis: an epidemiological survey in the province of Cremona, Italy
No full textA survey was carried out on swine ascaridiasis in a slaughterhouse of the Province of Cremona during two years. Among 90000 fattened pigs, 3.2% were found positive for A. suum. The highest prevalence was recorded in autumn (3.7%), the lowest in spring (2.7%). Lack of recurrent disinfections, of climatization, of all-in, all-out policy are associated with higher prevalences
Valutazione della circolazione di C.trachomatis in un campione di popolazione della città di Anzio
No full textIndustrial cooling tower, treatment and control measures to prevent Legionella spp.
No full textContamination of industrial cooling towers has been identified as the cause of sporadic cases and outbreaks of legionellosis. The epidemiological data showed as the risk of Legionella infection coming from cooling tower is underestimated. The aim of the study was to assess the effectiveness
of different disinfection treatments on Legionella colonization, performed within an industrial Cooling Tower System (CTS) starting from opening to closing season. Materials/Methods: Cold water samples were collected monthly from May to October 2016, during an environmental monitoring
of industrial CTS nearby Bologna, Italy. Legionella culture was carried out according to ISO11731-1998. Two disinfection treatments were subsequently performed in relation to microbiological levels found. The first performed for 7 days based on hydrogen peroxide (H2O2 )/silver salts (Ag+) at shock concentration of 100 mg L-1 in synergic association to an antialgal treatment and the second performed by sodium hypochlorite at 50 mg L-1 for 15 days. 1 / 2 inserimenti Results: Ourdata show the presence of L. pneumophila SG8 at a level of 5,06 log10 UFC L -1 after the water CTS filling, that required a shock treatment performed for one week by H2O2 /Ag+ . This treatmentincreases a Legionella contamination level until 6,14 log10 UFC L-1 . These data required a stop of CTS activity, washing of circuit by peracetic acid and two subsequently shock hyperchlorination.
After 15 days we observed a decrease of Legionella level to 1,90 log10 UFC L-1. maintained for all tested period. Conclusions: Our data confirm the role of routinely environmental monitoring before and during CTS operating conditions. The introduction of preliminary procedures before
the disinfection treatment as anti-scale treatment, washing of CTS, measures of physical-chemicalparameters and control of microbiological contaminants, permit a good performance of CTS, reducing the risk for the stakeholders and public health
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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