1,720,969 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
On the suitability of phillipsite-chabazite zeolitite rock for ammonia uptake in water: a case study from the Pescara River (Italy)
Full text linkIonic exchange tests have been performed on superficial wastewaters to remove ammonia using a volcanic zeolitized rock from Lazio Region (Central Italy). The zeolitite (natural zeolite) is characterized by chabazite, phillipsite and minor amounts of sanidine, leucite and analcime. After preliminary column experiments in laboratory focused to determine the saturation time of the zeolitite, a pilot plant was built up on a little water course near the area of San Giustino channel (Abruzzo Region, Central Italy). Wastewaters, characterized by starting ammonia value ranging between 5 and 120 mg/l, were filtered with a zeolitic bed. The first experimental results indicate a positive ammonia reduction of about 80–90% and, in all cases, NH4+ concentration values under the EU law limits. A main purpose of this paper is to evidence that most of studies published on uptake of ammonia by means of zeolitite lead with clinoptilolite-dominant zeolitite despite the large and best performance of phillipsite-chabazite zeolites (up to 61–79% improvement of ammonia uptake). Last but not least, a large number of published studies are of difficult comparison because of poor characterization of the zeolitite used
Geotourism in the Abruzzo, Lazio and Molise National Park (central Italy): The example of Mount Greco and Chiarano valley
No full textThe geomorphological landscape of the Abruzzo region is a great example of a variety and complexity of processes and morphogenetic events as well as all the Italian territory. Here, complex Mesozoic-Cenozoic palaeogeographies are still reflected by the main mountain chains of Abruzzo and offer scientists and tourists imaginary journeys through ancient, now vanished, coral atolls and blue deep seas. Valleys of glacial or fluvial origin, alluvial fans, present and paleolandslides still preserve the memory of these
ancient landscapes. In Abruzzo, Lazio and Molise National Park, where all of these landscapes are incorporated, the educational enhancement of geological and geomorphological themes has been pursued, with the creation and installation of information panels, theme trails and geotourist maps. In this framework, this paper
illustrates methods, initiatives and activities for the enhancement of geological landscape and geomorphosites, and particularly the Geotourist map of Mount Greco e Chiarano Valley. This map allows for the presentation of rocks and landforms of an awesome landscapes within the park in an easy-to-understand way, by means of different types of tools such as: 3D reconstructions, aimed to provide a three-dimensional perception of geologic processes and elements; landforms highlights, aimed at increasing the perception and identification of landforms and processes, as well as their impact on the landscape; palaeo-geographic reconstructions and cartoons, aimed at showing the evidence of landscape evolution. Main objective of the map is to enhance the geological heritage of a peculiar landscape in the Park and to make people aware that the present day landscape (i.e., a valley, a ridge, a landslide, but also a rock, a fracture) is the result of a millions to hundreds of millions of years of a dynamic evolution ongoing until now and the future.
Through the comprehension of the present landscape it is possible to explain to the public (from very young to aged) the geological history written in rocks and landforms and to make people aware of the very high dynamics of the landscape, which provides outstanding landscapes but also natural hazards and risks
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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