1,720,965 research outputs found
Primi dati di distribuzione del visone americano (Neovison vison) nella provincia di Vicenza. First data on the distribution of the American mink in the Province of Vicenza
No full textNatura Vicentin
Piccoli mammiferi in ambienti agricoli: struttura delle comunità e relazioni con gli elementi del paesaggio rurale
No full textAgricultural landscapes are affected by continuous stresses that leads to changes in the structure and composition of the system. These stresses also affect the semi-natural elements of the rural landscape and the animal communities that live in them. In italy, there are several species of small terrestrial mammals that are adapted to agricultural environments, including Apodemus sylvaticus, A. agrarius, Microtus arvalis and A. flavicollis. The aim of this study is to investigate the role of these species as biological indicators of the level of stress in agricultural landscapes. For this purpose, we relate community and population parametrs of the species with landscape and habitat parameters along a gradient of decreasing quality and quantity of natural elements in the landscape. The study area is located in Friuli Venezia Giulia and incluses three different agricultural areas that represent three different levels of agricultural intensification in three different landscape types: hills, lowlands (low planin) and high plains. To study the populations of the four species mentioned above we used live trapping in three different landscape types, for a total of thirty sample sites. The sampling effort was of four trap-night per session and trapping sessions were carried out every three months. The preliminary results collected in the summer and autumn 2011 at the landscape scale demonstrate that indices of richness, diversity and equitability for the four studied species decrease with the decrease of structural heterogeneity and the increase of agricultural intensification. At the habitat scale the species prefer hedges (as habitat shelter) and meadows (increasing diversity and equitability), but we saw a different use of the corn field habitat between the different seasons, as in the summer we trapped individuals also in this habitat while in autumn this habitat was avoided. From these preliminery results it seems that the presence of the four rodent species, at the landscape scale, reflects the quality of the natural elements in the agricultural landscape. This seems to suggest that it may be possible to use these species of small mammals as biological indicators
Piccoli mammiferi in ambienti agricoli: struttura delle comunità e relazioni con gli elementi del paesaggio rurale
No full textFirst report on the distribution of the American mink Neovison vison (Mammalia: Mustelidae) in central Italy
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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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