1,720,983 research outputs found
ACQUISITION AND ANALYSIS OF HISTORICAL SERIES OF HOURLY PLUVIOMETRIC DATA
Full text linkThe present research can represent a significant step forward due to the acquisition and analysis of historical time series of higher than usual frequency data (hourly), which allows to perform far more robust and significant statistical analysis of the variability and tendencies of the extreme storms, as well as the droughts. Two long historical series of hourly precipitation data were digitalized starting from analogical records, collected in Tuscany, Italy, one next to the coastline, the other over the inland mountains, covering 1945-2002 and 1930-2005, respectively. Data quality as well as homogeneity were checked by means of few statistical tests, such as the run test, including the comparison with data colleted at nearby rain gauges. The analysis of the overcomes of specific hourly thresholds, computed on the basis of the reference period 1961-1990, has shown significant increases at both sites in the latest 15 years with regards to the previous times, as well as an increased seasonality, resulting in the concentration of the most intense and extreme rainfalls in September-November. A significant decrease of the number of rainy hours was observed at both sites , mainly due to winter drying and, limited to the mountainous gauge, a relevant increase of the average hourly precipitation intensity. The analysis of reference percentiles for the hourly precipitation, such as, 99°, 99,5° e 99,9°, has shown positive trends at both sites, as well as the precipitation series consisting of 3, 6, 12 and 24 consecutive hours events. As a preliminary attempt to understand the findings, the tendencies of heavy sub-daily rainfalls was compared to the sea surface temperature (SST) time series, leading to partially significant outcomes and paving the way to further research
Rainfall variability over the Mediterranean Region and its linkage with large scale features
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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
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