1,720,958 research outputs found
Technological features of Cotto Variegato: a petrological aprroach.
No full textThe ‘Cotto Variegato’ are tiles used in Lombardy, between the XVII and XIX centuries as flooring for several historical buildings. Tiles are produced by the processing of two compositionally distinct clays. The main stylistic character of these tiles is a banded texture producing a veined aspect, in which white and red bands are also folded. The artefacts were hand crafted using two clayey raw materials of different composition, that are only partially mixed before the firing. The colour differences are produced during the firing. In all samples white and red portions are always composed of Ca-rich and Ca-poor clay, respectively. The multi-layered texture was obtained by a multiple folding and pressing process of the mixture. The interference of fold limbs with the tile surface gives the ‘variegato’ style to tiles. The paper explains how basic petrological knowledge can be applied to the study of ceramic artefacts in order to define provenance of the raw material, firing technology and how ancient craftsmen transformed the natural clayey materials into floor tiles. The methodological approach is that commonly applied to the study of the rocks and consists of textural analyses, at a different observational scale, combined with X-ray powder diffraction, X-ray fluorescence and microprobe analyses
Studio petro-archeometrico delle anfore di Sala Baganza (I sec. d.C.): costituzione di un gruppo di riferimento.
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
Manufacturing of roman ceramic artifacts in Po river plane : a multianalytical approach.
No full textA multianalytical petrological and geochemical approach, was applied to reconstruct the raw material treatments leading to manufacture of bricks and tiles of Roman Age in the province of Pavia (Northern Italy). The raw materials were modified in order to obtain a good quality of mixture. Soils and artifacts were collected in two areas, Lomellina and Oltrepo Pavese. The parameters strongly indicative of manufacturing process are the clast/matrix ratio and some of major oxide contents such as SiO,, A12O and CaO. In addition a multivariate statistical treatment was applied to abundance of minor and trace elements, including rare earth elements (REE). The same treatment was also applied to soil fractions (sand, silt, clay). This methodological approach allows to characterise soils and artifacts and to outline the processes of addition and/or purification of temper clasts.Une approche multianalytique, pétrologique et géochimique, a été appliquée aux sols et aux artefacts afin de reconstituer les traitements de matières premières pour fabriquer des briques et des tuiles à l'époque romaine dans la province de Pavie (Italie du Nord). Il est bien connu que, à cette époque, les matières premières étaient modifiées afin d'obtenir un mélange de bonne qualité. Des sols et des artefacts ont été échantillonnés dans deux zones, Lomellina et Oltrepo Pavese. Les paramètres fortement indicatifs du processus de fabrication sont le rapport grains/matrice et certains oxydes principaux tels que SiO,, A1,O3 et CaO. En outre, un traitement statistique d'analyse multivariée a été appliqué aux données de concentration dès éléments mineurs et traces, y compris les terres rares (REE). Le même traitement a été également appliqué aux fractions de sols (sable, silt, argile). Cette approche méthodologique permet de caractériser les sols et les artefacts, aussi bien que leur provenance, et de tracer les grandes lignes des processus de l'ajout et/ou de la purification des dégraissants.Cairo Alessandra, Meloni Sandro, Messiga Bruno, Oddone Massimo, Riccardi Maria Pia. Manufacturing of roman ceramic artifacts in Po river plane : a multianalytical approach.. In: Revue d'Archéométrie, n°26, 2002. pp. 23-31
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