1,720,958 research outputs found
Salt water intrusion in aquifers of the south oriental coastal zones of Sicily. IAEA-CN-118/124
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Characterization of Submarine Groundwater Discharge along the southeastern coast of Sicily (Italy)
No full textIn research and management of groundwaters, an important role is played by coastal aquifers. Pollution due to salinization and human activities poses serious concerns to the economy of the related territories. Under the project, established through collaboration between the Italian Universities of Palermo, Bari, Venice and the IAEA and the UNESCO, study of coastal aquifers from Syracuse to Donnalucata on the southeastern coast of Sicily was carried out. The study area, known as Hyblean Plateau, is characterized by carbonate and vulcanite outcrops, connected to the tectonic activity during the Cretaceous and the Pliocene period. The aquifers are subjected to overexploitation due to the high water demand for intensive agricultural practices. Thus, the equilibrium between fresh groundwaters and seawater is getting disturbed with consequent salinization. The research project involved the geochemical and isotopic study of well waters, springs and submarine discharges in order to understand the relationships existing among these waters, to identify the best tracers of the natural and human–related phenomena occurring in the area as well as to estimate the presence of possible environmental effects of them on the coastal ecosystem. Hydrogeochemical surveys were carried out, every three months, from 2002 to 2004 on a net of wells, sub-aerial and submarine springs. The present report synthesizes the main results of the research
Vulnerability maps pollution to hydrocarbon and urban waste pollution in seawater intrusion areas
No full textAccording to a national project promoted by the Italian National Group for the Protection against Hydrogeological Hazards, vulnerability maps (1: 50.000) of part of the Italian National territory have been published, particularly in Sicilia (Iblei Mounts, Madonie, Sicani and Etna). These maps have become a public document for local groundwater management. Dangerous phenomena have been reported in some zones of Sicily. Anthropic interventions have created toxic waste dumps in vulnerable areas. We explain the advantage of vulnerability maps in the study of dangerous types of pollution for the situation in the Augusta Priolo area, Sicilia, in which a petrochemical complex has been installed. Hydrogeological and petrochemical aspects are examined to assess the possibilities of a preventive intervention and reclamation. In the same areas, seawater intrusion is increasing in coastal regions
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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