1,720,994 research outputs found
Non invasive analysis of manuscript covers: portable X-ray fluorescence enlightening medieval jewellery masterpieces
No full textThis paper will present portable X-ray fluorescence (pXRF) analysis applied in situ to three 11th- 12th century manuscripts
covers considered as masterpieces of Northern Italy medieval jewellery: Pace di Ariberto (Milano), Liber Evangeliorium of
Vercelli and Pace di Chiavenna. These objects show a sumptuous decoration of golden leaves, plates and filigrees, enamels
and casted gems. The aim of this research is to obtain information on manufacturing techniques and composition of the artefacts, considering possible analogies and differences that may be useful for art historians' discussion on manufacture place and artistic connections. XRF analysis was performed in order to determine the composition of the metals and enamels, and quantitative results, obtained using certified standards, undergo data treatment with multivariate analysis. The present paper will present a part of the results obtained on both the metals and glass materials, underlying the potential of pXRF in producing reliable results also when working in non-ideal conditions
Caratterizzazione chimica della coperta del Codice C
No full textTra i materiali che costituiscono il cospicuo patrimonio del Museo del Tesoro del Duomo di Vercelli si conservano due coperte di libri liturgici della Biblioteca Capitolare. Una di queste, oggetto del presente volume, ha costituito fino all’anno 2000 la preziosa legatura del Codice C, un lussuoso Evangelistario allestito nello scriptorium vercellese negli anni Novanta del XII secolo. I due piatti di questa legatura – uno in argento a sbalzo con la figura di un Arcangelo e l’altro in oro, filigrane, sbalzi, gemme e smalti, con una complessa composizione che gravita intorno alla figura centrale del Cristo crocifisso – derivano in realtà da un contesto più antico, che resta ignoto, e furono riutilizzati per l’Evangelistario citato, le cui dimensioni furono probabilmente stabilite proprio a partire dalla preziosa coperta.
Questo volume presenta la descrizione e lo studio approfondito degli aspetti tipologici, tecnici e compositivi dei due piatti, con osservazioni anche sull’iconografia e sui risvolti stilistici nel confronto con altri manufatti coevi
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
Technological and compositional characterization of Red Polished ware from the Bronze Age Kouris valley (Cyprus)
Full text linkIn order to perform a physico-chemical multitechnique characterization, 26 fragments
of Red Polished ware from the archaeological survey in the Kouris river valley (Limassol
district, Cyprus) have been analyzed. Despite the gloss-like macroscopic aspect of the
potsherd surfaces, Scanning Electron Microscopy (SEM) morphological observation revealed
traces of mechanical polishing on the surfaces and the lack of a slip. Energy Dispersive
X-ray (EDX) elemental analyses in both scan and map modes confirmed the absence
of differentiation between body and surface composition. Chemometric evaluation
on EDX bodies data showed a lack of sub-classification. Mineralogical patterns, obtained
by X-Ray Powder Diffraction (XRPD) analysis revealed great variability among samples
and the presence of amphiboles in 14 sherds, whose identification as horneblende and
riebeckite was confirmed by petrographic examination. The unusual presence of these
minerals in a ceramic ware fits with the Kouris valley geology, in agreement with traditional
models of local raw materials exploitation for protohistoric societies. XRPD data,
together with SEM images evaluation, pointed to firing temperatures ranging from 800 to
1050°C, suggesting the use of kilns instead of open fires or pits; on the other hand the
colour heterogeneity testified to limited control of the kiln atmosphere
New evidence of non-traditional Egyptian blue manufacture in the 6th century Ashburnham Pentateuch
No full textThe Ashburnham Pentateuch (Paris, Bibliothèque nationale de France, ms. NAL 2334), dated around 600 CE, is an early medieval illuminated manuscript containing five books of the Old Testament. It is one of the most important artworks of its genre, thanks to its pictures that are among the earliest surviving and most extensive biblical illustrations. It is richly decorated with 18 full-page miniatures (remains of the original 69) illustrating scenes from the Genesis and Exodus biblical books. Its production has been assigned on stylistic base to Spain, Northern Africa or Italy. The miniatures of the Pentateuch have been analysed in non-invasive way by means of UV–visible diffuse reflectance spectrophotometry with optical fibres (FORS), spectrofluorimetry and X-ray fluorescence spectrometry (XRF) in order to characterise its palette and to compare it with those of other early medieval manuscripts. The results of this investigation highlighted the wide use of the pigment Egyptian blue, an unusual feature in miniature painting; moreover this synthetic pigment appears to have been produced following a non-traditional manufacture, due to the analytical evidence of a copper/zinc alloy as source of copper instead of the traditional sources used by Egyptians and Romans, i.e. copper, copper minerals or bronze
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