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Rare Earth Element discriminant power: a case-study on the white marble from the Torre Civica excavations (Pavia-Italy)
No full textOn the provenance of archaeological white fragments from excavations at the Torre Civica (Pavia - Italy)
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The provenance of the white marble from the Torre Civica excavations (Pavia-Italy)
No full textWe sampled 51 white marble fragments from the Pavia Torre Civica (excavations 1972-73: 49 samples; debris from its collapse in 1989: 2 samples) and 1 fragment (2 samples) from a Roman column reused in the 19th century Milan gate of the city, together with 75 samples from white marble quarries in the central and eastern Mediterranean basin; the aim of our study was to examine the circulation of marble in Roman Pavia and to verify the results of previous petrographic research. The Torre Civica samples, stratigraphically datable to the later Middle Ages, document the reuse of the precious building materials of Roman Pavia, and can thus be considered a representative sample of the marble circulating in the city in the Roman period.
The samples underwent instrumental neutron activation analysis (INAA) at the Triga Mark II reactor facility at the University of Pavia; we determined 12 rare earth elements (La, Ce, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Tm, Yb, Lu) and 10 trace lements (Ba, Co, Cr, Cs, Hf Rb, Sb, Sc, Th, U). Stepwise discriminant analysis, a technique for the description and testing of inter-group differences, was applied to identify those variables with the greatest discriminant power. The most significant variables were: Ce, Yb, Th, Sc and Cs. Using these variables, cluster analysis separated the samples into 5 provenance groups (the Massa Carrara area, Hymettus, Pentelikon, Marmara, Paros)
Our results show that although 32 (62.7%) samples were provenanced as from the quarries near Massa Carrara, 19 (37.3%) were assigned to east Mediterranean quarries (Hymettus - 2; Pentelikon - 7; Marmara - 6; Paros -4), thus confirming the close commercial links between the Adriatic and Aegean basins in antiquity
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
Multas per gentes et multa per aequora. Culture antiche in Provincia di Pavia, Lomellina, Oltrepò e Pavese
No full textDispelling 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
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