1,720,987 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
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
Remediation of contaminated sites in Italy: state of the art of technologies and plannig & design criteria
No full textRemediation of contaminated sites in Italy has been so far governed by the so-called Ronchi Decree (Ministerial Decree 2/97) and by the subsequent Ministerial Decree 471/99, which laid down detailed procedural and technical provisions. Most of the site remediation projects conducted in Italy have fallen under the scope of the above Decrees.
This legislation was recently revised by Legislative Decree no. 152 of 3 Apr. 2006 (hereafter called "Decree 152/2006"), consolidating and superseding all previous laws and regulations on environmental matters (including general legislation on water protection, namely Legislative Decree no. 152 of 11 MayI999). On the other hand, Decree 152/2006, including provisions on remediation of contaminated sites, is already being overhauled. Against this background, it is useful to make a critical analysis of the seven years of application of the prior legislation (Ministerial Decree 471/99), in order to derive suggestions for the more technical aspects of the ongoing revision.
The following analysis considers both remediation and emergency containrnent of contaminated groundwater and soil, focusing on the interaction between the legislative-regulatory framework and the consequent technological choices and, namely, on their planning & design. The analysis is of a merely qualitative nature and hinges on the direct experience of the Authors, acting as remediation specialists and technical and scientific consultants. Therefore, the analysis solely reflects their personal opinions.
Table 1 gives a qualitative overview of the technologies used in Italy for rehabilitating contarninated sites. The Table shows that most of the technological options available in the state of the art have been used.
Largely dominant among them were ex-situ technologies, especially excavation and disposal for soil and Pump & Treat (P&T) for water. These approaches, whose use was at tirnes inevitable, were not particularly effective in terms of environrnental sustainability. Indeed, in both cases, the contarninated resource is not restored to its original or potential uses. Even if encouraging progress has recently been made, the use of in-situ technologies has remained marginal and should thus be intensified. Among the latter technologies, mention is to be made of those largely used in other countries, such as permeable reactive barriers, aerobic and anaerobic bioremediation and in-situ chernical oxidation
Verifica delle prestazioni finali degli interventi di messa in sicurezza dei siti contaminati (barriere impermeabili): Linee Guida
No full textMetodologie di approccio alla valutazione dei valori di fondo naturale nella bonifica dei siti contaminati
No full textIl problema della definizione del fondo naturale di elementi e composti inorganici, sostanze presenti nel ciclo geochimico naturale, viene affrontato nel caso vi siano stati superamenti di valori tabellari previsti dal D.M. 471/99 nel corso della caratterizzazione di un sito.
A tal proposito viene proposto un metodo statistico che, secondo la letteratura ed esperienze pratiche di campo, è stato selezionato secondo due tipi di approccio, relativi rispettivamente alla presenza di un sito piccolo (superficie < 1000 m2) e medio-grande.
Si parte da tre necessari presupposti di base costituiti dalla presenza nel sito delle sostanze di interesse anche per motivi naturali, dalla localizzazione dei prelievi in corrispondenza di aree non impattate dalle attività antropiche considerate e dalla disponibilità di un sufficiente numero di campioni per una elaborazione statistica.
Vengono quindi opportunamente considerati, per la successiva trattazione, i dati sperimentalmente misurati riguardanti i valori inferiori ai limiti di rilevabilità analitica e gli outlier.
Successivamente, dopo un preventivo test di confronto tra le due popolazioni (sito e fondo) per ricavarne la differenza o la similitudine, viene eventualmente determinato il valore di fondo più probabile considerando il valore medio più la deviazione standard del campione (sito piccolo) o il risultato della costruzione di una curva di distribuzione cumulativa (sito medio grande)
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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