1,721,202 research outputs found
LA LINEA DI COSTA TRA SIPONTO E BRINDISI, PORTI ED APPRODI: L’INDICATORE CERAMICO
No full textThe study of ceramic fi ndings from the new systematic archaeological investigations in the towns of Egnazia and Siponto, together with the analysis
of items in museum storage, broadens the horizons of knowledge of ceramics with negative decoration in the Byzantine and Islamic styles found in important
ports; the existence of thriving medieval traditions is well documented in terms of archaeological materials. Th e abundance of stratigraphically contextualized
material, moreover, makes it possible to accurately determine the chronological periods to which the various types of production and importation correspond.
Indications regarding provenance and technological characteristics are supported by archaeometrical investigations, the results of which are in line with those
from the archaeological analysis
La produzione e il commercio del vino in Magna Grecia (La navigazione tra VI e I secolo a.C.; Impianti produttivi di anfore; Le anfore vinarie in Magna Grecia tra V e II secolo a.C.; Il vino in Magna Grecia tra e II secolo a.C.)
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
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
Turbulent velocity fields in smoothed particle hydrodymanics simulated galaxy clusters: scaling laws for the turbulent energy
No full textWe present a study of the turbulent velocity fields in the intracluster
medium (ICM) of a sample of 21 galaxy clusters simulated by the smoothed
particle hydrodynamics code GADGET2, using a new numerical scheme where
the artificial viscosity is suppressed outside shocks. The turbulent
motions in the ICM of our simulated clusters are detected with a novel
method devised to better disentangle laminar bulk motions from chaotic
ones. We focus on the scaling law between the turbulent energy content
of the gas particles and the total mass, and find that the energy in the
form of turbulence scales approximately with the thermal energy of
clusters. We follow the evolution with time of the scaling laws and
discuss the physical origin of the observed trends. The simulated data
are in agreement with independent semi-analytical calculations, and the
combination between the two methods allows one to constrain the scaling
law over more than two decades in cluster mass
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