1,721,084 research outputs found
Tefrostratigraphic study for the last 18000 14C years in a dep sea sediment sequence for the south Adriatic
No full text
A high detailed tephrochronology study for the last 18,000 14C years in the south Adriatic deep-sea sediments
No full text
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
Response of the pelagic enviroment to palaeoclimatic changes in the central Mediterranean Sea during the Late Quaternary.
No full textThe Recent Activity Of The Lake Albano Maar (Colli Albani Volcano, Roma, Italy).
No full textLake Albano is a composite maar that fed the last phases of activity of the Colli Albani volcano, located just south of Roma, Italy. The study of several new stratigraphic sections opened by archeological escavations and civil works has revealed the existence of two previously unknown phreatomagmatic deposits, and of several lahar deposits. 14C radiometric dating indicate an age comprised between 5000 and 3500 years for the younger phreatomagmatic deposit and indicate that the Colli Albani volcano must be considered quiescent. Geomorphological analysis, the distribution of the early human settlements in the area and the revision of the ancient history and myths of Roma, are coherent in indicating that the activity of lake Albano is much younger than previously believed. Until the IV Century b.C. catastrophic exondations have occurred from the lowest rim of the lake, with lahar emplaced mainly in the Ciampino plain and extending to the southern suburbs of Roma. The repetition of these phenomena was prevented by a drain-tunnel dug by ancient Romans. The overflows were possibly triggered by sudden injections, in the lake bottom, of hot and CO2-rich fluids that are certainly present underneath the volcano. The presence of several gas emission sites, the high CO2 flux in zones corresponding to structural highs of the carbonate basement, the existence of pressurised aquifers also at shallow depth and the reported sudden increase of water temperature and gas release in relation to earthquakes, indicate that a similar hazard persists nowadays
- …
