1,720,987 research outputs found
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
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
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
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
Non-invasive differentiation between natural and synthetic ultramarine blue pigments by means of 250-900 nm FORS analysis
No full textA totally non-invasive procedure has been developed for differentiation of natural and synthetic
ultramarine blue pigments on the basis of collection of UV-visible spectra in diffuse reflectance mode,
followed by a chemometric treatment of the data using unsupervised pattern recognition methods. The
main spectral features of natural and synthetic paint samples, i.e. reflection maxima, inflection points
and reflection minima, could not be useful enough in the differentiation process; a threshold of 455 nm
in the comparison of reflectance maxima has been observed, with synthetic samples peaking lower than
this value and natural samples peaking higher, but it was not considered efficient in the differentiation,
according to the fact that reflection maxima could be subjected to a bathochromic shift as a
consequence of the addition of white pigments to blue paints. Chemometric analysis was therefore
used in order to exploit information contained in the whole spectrum. To obtain an efficient
classification, a proper data transformation was performed on the spectral data, using Z-score
standardised variables. Principal Component Analysis (PCA) and Hierarchical Cluster Analysis (HCA) were
the unsupervised pattern recognition methods used on the spectral data. Chemometric treatment was
firstly applied to analysis of standard ultramarine blue paints and powder pigments and showed a good
differentiation power, making it possible to distinguish between paints and raw lapis lazuli items and,
more interestingly, between natural and synthetic ultramarine blue paints. Afterwards, PCA and HCA
were applied to the analysis of blue paints on miniature painting artworks, again succeeding in the
differentiation. This procedure could be used to develop a simple and totally non-invasive method for
authenticating painted artworks
Dispelling 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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