1,720,955 research outputs found
In situ non-invasive characterization of pigments and alteration products on the masonry altar of S. Maria ad Undas (Idro, Italy)
No full textA non-invasive characterization study has been performed and here presented for the first time on the masonry altar of S. Maria ad Undas, a parish medieval church on the Idro (Brescia, Italy) lakeshore. The determination of painting materials and of alteration products represent the one of the first steps, together with art history studies, of a wider project aimed to the valorization of the site. Images collected under UV light in fluorescence and reflectance mode provided useful information about the presence of organic residual materials attributable to the application of lost gilding details, while the readability of some particulars was greatly improved with respect to what observable in visible light. Moreover, near infrared (NIR) images led to hypothesize the presence of green earths in green painted areas. Raman and reflectance spectroscopy allowed the identification of the pigments and of several alteration products, such as plattnerite, which derived by the degradation of the lead-based ones, hydromagnesite, gypsum, and niter, as well as of carbon-based depositions
Portable instrumentation for the study of wall paintings: the case of S. Maria ad Undas in Idro (BS-Italy)
No full textThe parish church of Santa Maria ad Undas, on the Idro Lake shores, externally looks quite simple and austere while the inner single nave possesses a rich decorative apparatus, currently mostly covered by a white lime layer applied during the seventeenth century plague period.
Its unique characteristic is the painted masonry altar, discovered in 1955 after the removal of an eighteenth-century altarpiece. It is a very rare artifact comparable only with two other altars, both located in the Brescia area. The style and the oriflamme of San Bernardino of Siena suggest that such decoration was realized shortly after 1443, when the symbol was formally canonized. Being the altar immovable a preliminary in-situ study was mandatory to plan possible consequent laboratory analysis to finally assembly a valorization project also including a restoration and conservation plan.
A set of three non invasive techniques was used to characterize both the author palette and neoformed secondary phases that may be present: Multispectral Imaging, Raman spectroscopy and Reflectance Spectroscopy (FORS). Images acquired under UV light, in both fluorescence and reflectance mode, gave useful information about the presence of organic residual materials due to the presence of a binding medium used for the application of currently lost gilding details [1]; at the same time the readability of some details was improved with respect to what observable in visible light. Images collected in Reflected Near Infra Red (RNIR) light led to formulate initial hypothesis about some of the pigments used by the artist, such as hematite, goethite and green earths [2]. The combined use of the two spectroscopic techniques allowed to clearly identifying the pigments and the alteration phases on the altar: the red and yellow areas showed signals typically attributed to hematite and goethite, confirming what supposed from RNIR imaging. Furthermore the presence of white lead was stated by Raman spectroscopy, while the use of FORS resulted fundamental torecognize the blue and green pigments as azurite and green earths [2]. As concerning the secondary phases, quite common species such as gypsum, niter and hydromagnesite were revealed due to the detrimental effect of the average church environmental conditions, such as very high humidity and relatively low temperature. The same combination is a fundamental condition for the formation of Plattnerite as alteration phase of white lead when applied in frescoes [3]; other black areas resulted covered by a thin carbon-based layer attributable to the burning of candle
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
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
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
- …
