1,721,435 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
Il gruppo dei pari e l’educazione alla democrazia.
No full textIl contributo illustra alla luce di esperienze di docenza come il gruppo dei pari e il lavoro di gruppo possano risultare strumenti di formazione complessa, di educazione alla democrazia e di co-costruzione della conoscenz
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
Metalli pesanti nei cetacei dell'Adriatico settentrionale e possibili effetti sub-letali
No full textIl lavoro presenta i risultati delle ricerche effettuate relativamente ai tassi di metalli pesanti in cetacei spiaggiati lungo le coste dell'Adriatico settentrionale e alcune speculazioni relative ai possibili effetti sub-tossici esercitati nei soggetti stessi
Heavy metals in dolphins from the Northern Adriatic Sea and potential subtle toxic effects
No full textEnvironmental pollution represents one of the main threats for marine ecosystems conservation. Top predator are particularly exposed to contaminants and; due to their anatomical and physiological characteristics, cetaceans can reach very high pollutants tissue body burdens (i.e. organochlorine and heavy metals). These marine mammals and are thus considered as good indicators of marine environmental pollution where , and among them heavy metals are one of the major contaminants classes.
Present research reports about theon quantification of heavy metals in tissues of stranded bottlenose dolphins (Tursiops truncatus) from Northern Adriatic Sea and presents show some speculation on possible subtle adverse effects exerted by these levels on the general health of the animals.
Stranded dolphin were collected along Northern Adriatic Sea coasts during a 5 years period and underwent necropsy for the determination of the causes of death. ; during examination, Tissue samples organs were sampled and stored at -20°C until analysis, which was performed with an Inductively Coupled Plasma-Atomic Emission Spectroscopy (ICP-AES) technique. Quantified metals were Cr, Ni, Cu, Zn, Hg, As, Se, Cd and Pb and data are reported as mg/kg (ppm) on a wet weight basis. When possible, gender and age of the animals were recorded.
All metals were at detectable levels, presenteding a huge variation among animals and tissues. Interestingly, sSome of the most common contaminants for marine environment were detected at low levels, often below limit of quantification, also in accumulation target organs like liver and kidney. Mean heavy metals detected were to be considered as low, but high enough to exert a potential immunotoxic effect on animals, as the levels detected are comparable to those which proved to be active in vitro on lymphocytic cytotoxicity, apoptosis, lymphocytic proliferation and phagocytic activity, as confirmed by some anatomo-pathological observations of lymph node swelling. Some speculation on potential reproductive effect of detected heavy metals levels are also proposed, even if no clear evidence of altered reproductive activity was observed.
From obtained data there seems to be a reduced exposure to heavy metals, even thought a higher susceptibility to infectious diseases can be considered for studied animals
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
Conclusione di «Numeri pari e argomentazione» e lancio di «Risolvere equazioni tra artefatti e procedure»
No full textDiscussione sul quesito Invalsi sui numeri pari e lancio di una nuova storia sulla risoluzione di equazioni
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