1,720,975 research outputs found
I paleosuoli del Pleistocene medio nel settore centrale della pianura padana: il problema del ferretto nella stratigrafia del Quaternario continentale
No full textUna fase di avanzata glaciale nell'Olocene superiore, precedente alla Piccola Glaciazione, nelle Alpi Centrali
No full textQuaternary Stratigraphy and soil development at the southern border of the Central Alps, the Bagaggera sequence
No full textPalaeomagnetic stratigraphy and archaeologic finds indicate that the sediments of the Bagaggera basin accumulated at least from Early Pleistocene up to Late Pleistocene. Five glacial stages are recorded in the sedimentary sequence, the oldest one dating back to Early Pleistocene, and only the last 2 are directly connected with the front of the Alpine glaciers. Five different paleosols are interlayered in the basin fill; 4 indicate that, during Interglacial period of Middle and part of Early Pleistocene, soil forming processes were not very different from those which operated in Postglacial times. On the contrary the oldest paleosol, dating back to Early Pleistocene or Late Pliocene, is due to stronger weathering and probably developed in a different pedoclimatic environment. -from Author
The variation of Italian Glaciers between 1980 and 1999 inferred by the data supplied by the italian glaciological committee
No full textThe study synthesis the analysis of those data relevant to the variation registered in the Italian glaciers during glaciological surveys carried out by the Italian Glaciological Committee between 1980 and 1999. The last twenty years of the 20th century were characterized by a phase of general retreat of the glaciers, that followed an advancement phase that took place in the 70s and in the early 80s. The data matrix, which is largely incomplete, includes 335 glaciers. The percentages of advancing, stationary and retreating glaciers have been reckoned on the entire sample and on the single geographic sectors, mountain groups and glaciers having comparable aspects and size. Cumulative and yearly values of the front variations and of the terminus elevation changes have been quantified for those glaciers with at least 10 data out of 20. The percentage of advancing glaciers decreased from 66% in 1980 to 4% in 1999, while that of the retreating ones increased from 12% to 89%. These values changed quickly during the first decade, and then stabilized during the following one. The decrease in the number of advancing glaciers took place first in the Eastern Alps (Trentino-Alto Adige, Veneto and Friuli- Venezia Giulia: Triveneto Regions) and later in the Central (Lombardy) and Western (Piedmont-Aosta Valley) sectors. A similar trend has been also observed in the bigger glaciers and in those having a northern or southern exposure, while the smaller glaciers and those facing east and west have shown more irregular variations. The average annual variation per glacier was of -4.8 m/year, for an average total variation per glacier of -95.4 m, during the twenty years considered. However, marked differences have been observed over the two decades, with stronger variations during the period between 1990 and 1999. The retreat phase was more marked in the Central sector (Lombardy), where the average total retreat of the fronts was of nearly 150 m. Modest variations (-44 m) occured instead in the Western sector (Piedmont-Aosta Valley). The small glaciers had little annual average variations compared to the bigger ones, but greater, in proportion. The magnitude of the retreat was greater for those having an eastern and western exposure compared to the others. The minimum altitude of the glacier fronts raised 18 m on average. Marked variations (+38 m) were recorded in the Central (Lombardy) sector, while those in the Eastern sector were smaller (+12 m) and those in the Western one marginal (+3 m)
L’Islanda: terra di calamità, terra promessa
No full text(a cura di G. Orombelli, C.Smiraglia,R. Terranova
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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