1,721,008 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
PM10 emission factor from swine husbandry in Northern Italy : application of an accurate measuring method
No full textApparato per il rilievo automatico dell'interferenza disturbi con la teletrasmissione dati nella rete a BT e AT.
No full textVariations 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
Diurnal pattern and seasonal variations in indoor PM10 concentration and emissions from a swine barn : application of a correction factor to continuously collected data by filter-based gravimetric technique
No full textAmmonia, methane, nitrous oxide, carbon dioxide and particulate matter emissions in two different buildings for laying hens
No full textAmmonia (NH3), methane (CH4), nitrous oxide (N2O) and particulate matter (PM2.5 and PM10) emissions were monitored in two different buildings for laying hens in Italy, both housing approximately 60,000 hens each. The first unit had an in-house prolonged droppings storage (deep-pit), the ground floor was for manure storage and the hens were housed on the first floor. The second unit had a manure removal system for lower environmental impact, where the droppings are dried on ventilated belts. The data were collected continuously in six periods of approximately 1 week each, over one whole year, using a photoacoustic detector (Bruel&Kjaer) to measure NH3, CH4 and N2O and an on-line instrument to measure PM. The ventilation rate was also continuously recorded in order to determine emissions. NH3 emission factors were 0.163 kg yr-1 hen place-1 for the deep-pit system and 0.062 kg yr-1hen place-1 for the ventilated belt. The ventilated belt emission factor is significantly higher than that given for the corresponding technique reported in the IPPC ILF BREF (0.035 kg yr-1 hen-1 place-1), based on Dutch studies. The emission factor for the deep-pit house is fully compatible with the value assessed by Italy in the IPPC-TWG, 2002 (0.154 kg yr-1 hen-1 place-1), but much lower than the Dutch value (0.386 kg yr-1 hen-1 place-1) for the same technique. This result confirms that the technique can reduce NH3 emissions in countries with warmer climates, where higher temperatures and ventilation rates lead to faster and improved drying of the manure in the pit. The NH3 emission reduction factor for the ventilated belt technique, compared to the deep-pit technique, was 61%. The CH4 emission factors measured in our work were 0.08 kg yr-1 hen place-1 for the ventilated belt technique and 0.03 kg yr-1 hen place-1 for the deep-pit technique. No significant emissions were registered for N2O, which was consistently close to zero for both techniques. PM emissions were greater from the deep-pit system in comparison with the ventilated belt system
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
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