1,721,078 research outputs found
The "Cool Down, Then Ablate" Principle Guides the Treatment of Ventricular Tachycardias in Myocarditis
No full textElectrophysiological findings and long-term outcomes of percutaneous ablation of atrial arrhythmias after surgical ablation for atrial fibrillation
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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
Sediment transport in a pre-alpine stream : bed-load monitoring and flood history effects
No full textLAUREA MAGISTRALEStudio del trasporto solido del torrente Caldone.Sediment transport along gravel-bed mountain river is a complex phenomenon governed by several factors including geomorphology aspects, duration and intensity of flood events and characteristics of the transported grains. The importance of monitoring sediment processes is indisputable: in the past century sediment balance has suffered considerable alterations affecting energy production, navigation, habitat and ecosystems, even representing a risk for the population. Depending on its magnitude and duration, each flood leaves the channel bed in different conditions, which influence the bedload transport of the next event. This work represents the continuation of the sediment monitoring which was started in 2016 by the ‘Politecnico di Milano’, under commission from the Lecco Municipality. After a proper survey of the sediment transport phenomenon, the history-dependence of bedload along the Italian pre-Alpine stream Caldone (Lecco), has been monitored using data collected in three years of RFID (Radio Frequency Identification) tracing application techniques and the new installation of direct bedload samplers in the study case (between October 2018 and June 2019). In fact, after an accurate investigation of the main available literature direct techniques, ‘Bunte’ portable bedload samplers (Bunte, 2017) and the fixed support ‘Slot’ trap instrumentations have been selected for the bedload monitoring of the study case. Both of the methods allowed us to directly collect samples of sediment material and monitor bedload dynamics in the stream. The investigations conducted permitted to individualise on field some flood history effects in accordance to literature and laboratory observations highlighted in other studies (e.g. Mao, 2018). A general decrease of sediment transport has been observed in correspondence with events preceded by high volume floods, probably induced by the history memory of the bedload built by antecedent events. Completely different behaviours have been registered when less important flood volumes preceded bigger events and the sediment transport resulted in being much less affected than the previous combination
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