1,720,983 research outputs found
La rete ecologica siciliana: valore naturalistico delle aree protette e dei siti NATURA 2000 e indicazioni per una gestione sostenibile
No full textLa rete ecologica siciliana: valore naturalistico delle aree protette e dei siti NATURA 2000 e indicazioni per una gestione sostenibile.
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Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Get PDF“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
Get PDFWe 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
Fan morphodynamics and slope instability in the Mucone River basin (Sila Massif, southern Italy): significance of weathering and role of land use changes
No full textIn the present paper, the preliminary results of a study concerning the fan dynamics in the valley of the Mucone River (Sila Massif, southern Italy) are presented. In the study area highly weathered Palaeozoic crystalline rocks crop out, ranging from residual soils to moderately weathered rocks. Because of the rugged topography and the abundance of weathered deposits, mass movements affect the great majority of the catchments. The most common instability phenomena are represented by rotational and translational slides, with subordinate rockfalls on steep to near vertical slopes. Debris-flow and debris avalanche scars occur at the upper-middle reaches of many catchments. They are caused by mobilization of colluvial and weathered materials during large storms and are usually channelized in the main canyon of the basin. At the catchment mouth, deposition of debris-flow material occurs, contributing to the building up of fans. In order to assess the fan morphodynamics and the slope evolution in the temporal range 1955–1996, multi-year air-photo interpretation and field surveys concerning morphodynamic processes and vegetation cover features were carried out. Field observations allowed discriminating the type of fan deposits (debris-flow or water-flow dominated, mixed deposits) and the successional stages of vegetation. Results showed that fans were concerned by different activity and dissection modality, in addition to diverse evolution patterns in vegetation communities, according to the fan aspect. At the basin scale, from 1955 to 1996 changes in land use and in the disturbance regime involved a considerable expansion of natural vegetation cover at the expense of cultivated lands. Such occurrences very likely played a major role in determining a remarkable attenuation in slope instability at the basin scale and a progressive trend toward inactivity of the fans
Dispelling the Myths Behind First-author Citation Counts
Get PDFWe 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
Survey of viral infections in spontaneous grapevines from natural environments in Sicily
No full textThe presence of nine of the most economical important grapevine viruses was surveyed in eight spontaneous grapevine populations from natural areas of Sicily. Arabis mosaic virus (ArMV), Grapevine fanleaf virus (GFLV), Grapevine leafroll-associated virus 1, 2 and 3 (GLRaV-1, -2 and -3), Grapevine virus A and B (GVA, GVB), Grapevine rupestris stem pitting-associated virus (GRSPaV) and Grapevine fleck virus (GFKV) infections were assessed by molecular and serological methods in 73 vines collected in summer 2013 and winter 2013-2014. Reverse transcription-multiplex PCR detected nine GRSPaV- and one GFLV-infected plants in five and one grapevine populations, respectively, while no ArMV, GLRaV-1, GLRaV-2, GLRaV-3, GVA, GVB, GFKV infections were detected. ELISA tests on dormant wood confirmed the result of the molecular detection. The relationship of Sicilian wild grapevine isolates with isolates from grapevines of different geographic origin was investigated through sequencing of the complete coat protein (CP) region of GRSPaV, and partial CP and homing protein (HP) domains of GFLV. Pairwise comparison among the Sicilian GRSPaV CP sequences showed identity scores ranging from 81.67 % to 99.87 % and from 92.66 % to 100 % at nucleotide (nt) and amino acid level (aa), respectively. For GFLV, the CP sequence showed identity ranges from 84.28 % to 90.48 % (nt) and from 89.39 % to 97.11 % (aa); higher variability was obtained analysing the HP domain with identity scores ranging from 68.42 to 93.28 % (nt) and from 58.02 % to 93.23 % (aa). According to phylogenetic analyses, GRSPaV and GFLV isolates from Sicilian wild grapevines clustered with isolates from cultivated grapevines without any correlation between isolate distribution and their geographic origin
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