1,721,013 research outputs found
MULTIBAND IMAGING TECHNIQUES INCORPORATED INTO THE STUDY OF DYED ANCIENT EGYPTIAN TEXTILE FRAGMENTS
No full textThe main aim of this research is presenting the application of the Multiband Imaging (MBI) techniques applied to the investigation of three ancient Egyptian dyed textile fragments from different chronological periods, stored in the collection of the Cairo Egyptian Museum. The documentation of these fragments can be a support for the textile conservator thanks to its easy detection of variances compared with analytical spectra. Moreover, presenting how these portable, non-invasive and inexpensive techniques can be used to provide heritage documentation, enhancing the features of the textile, providing qualitative information on the composition of different dyes used and a first recognition of the state of conservation. Preliminary visual investigation and Ultraviolet-Visible (UV-VIS) microscopy examinations were applied to better understand weaving techniques, fibre classification and dyeing methods, followed by the non-invasive multiband imaging techniques. The MBI techniques carried out on textiles are visible reflected (VIS), ultraviolet-induced visible luminescence (UVL), ultraviolet reflected (UVR), ultraviolet reflected false colour (UVRFC), visible induced luminescence (VIL), near-infrared reflected (NIR) and infrared reflected false colour (IRRFC) photography, which gives evidence of the colourants and materials used and their spatial distribution. At this phase, some dyes can already be determined such as madder and indigo/woad
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
Flu vaccination 'influenced' by Covid-19: Italy experience
No full textThe population after the covid 19 pandemic has become
more aware of the usefulness of vaccination, not just the
SARS-CoV2 vaccination
An integrated multimethodological approach for characterizing the materials and pigments on a sarcophagus in St. Mark, Marcellian and Damasus catacombs
No full textThe increasing interest and debate about the extent of the polychromy of ancient artefacts is generating more attention to the study of the traces of colour remaining on their surfaces. The small amount of these traces lead to a new approach for their characterization in order to limit sampling and hopefully avoiding it. The application of a protocol based on imaging techniques integrated with data obtained from single-spot techniques such as X-ray fluorescence (XRF) and fibre-optic reflectance spectroscopy (FORS) provides high-quality information about the materials. The integrated protocol has been applied in the study of a sarcophagus in San Callisto complex in Rome, and the efficacy of its use is confirmed by the data obtained. The sarcophagus, dating back to fourth-century C.E., is located in Saints Mark, Marcellian and Damasus catacombs. The study was focused on characterization of materials through a multidisciplinary approach with in situ non-invasive techniques (multispectral photography, visible-induced luminescence, XRF and FORS) and microinvasive analytical methods in order to identify the marble’s provenance through a consolidate multianalytical approach (X-ray diffraction, optical microscopy, isotopic ratios). In situ analyses were conducted in critical environment due to the high humidity (RH = 100 %), low temperature (T = 15 °C) and high CO 2 levels, all factors representing a challenge for either the operators or the electronic instrumentations. This work is included in a wider research project aimed to enlighten the use of colours on the sculptures in the roman time and to better define the composition of used raw materials
Chemical characterization of pope pius vii ancient ecclesiastical vestment by a multi-analytical approach
No full textThis paper presents a multi-analytical investigation performed for the study of the ecclesiastical vestment, with insignia, of Pope Pius VII, painted from the end of the 18th up to the beginning of the 19th century, made of five clothing elements: chasuble, stole, maniple, chalice veil and purse. The aim of this research was to assess the conservation state of the silk and painted backgrounds; to define the manufacturing technique of the work; to localize, if present, the underdrawing and any retouching; to identify the pigments and, where possible, the binders used. A diagnostic protocol was developed based on preliminary investigations through multiband imaging techniques known as MBI (visible, ultraviolet-induced visible luminescence (UVL), near-infrared reflected (NIR) and infrared reflected false color (IRRFC) photography). The images acquired with MBI techniques ensured a more specific choice of spots to be analyzed directly in situ by non-invasive techniques. In particular, portable digital optical microscopy and X-ray fluorescence (XRF) were performed. Two fragments detached from the chasuble were also analyzed by microFT-IR, microRaman, scanning electron microscopy (SEM-EDS) and gas chromatography/mass spectrometry (GC-MS). Application of the multi-analytical protocol enabled the materials used to be characterized and helped to define the peculiar execution technique used. The presence of an underdrawing made with a carbon pencil was highlighted by MBI. Red lakes, iron-based pigments and copper-based pigments have been identified on the painting palette, applied with arabic gum as a binder
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