1,720,990 research outputs found
Perception and Production Pitch and Length in two varieties of Italian (Pisan and Crotonese)
No full textStudio sperimentale sulla percezione della trasparenza con figura e sfondo acromatici e omogenei
No full textIdentificazione dei coloranti naturali con metodi non invasivi
No full textIl lavoro presenta i risultati preliminari ottenuti da un’indagine sistematica condotta con spettroscopia in riflettanza con fibre ottiche (FORS) nel campo spettrale visibile su un elevato numero di campioni di riferimento in lana e seta tinti con diverse materie prime coloranti naturali (anche in miscela) impiegando vari mordenti e diverse procedure di tintura.
L’analisi degli spettri FORS ottenuti ha consentito di valutare la presenza di caratteristiche spettrali discriminanti per alcune tra le diverse materie prime coloranti considerate (blu e rosse in particolare) e di valutarne le modificazioni associate ai differenti substrati e mordenti, oltre che evidenziarne gli effetti dovuti alla saturazione della tinta
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
Characterisation of colourants on illuminated manuscripts by portable fibre optic UV-visible-NIR reflectance spectrophotometry
No full textThe use of ultraviolet and visible diffuse reflectance spectrophotometry as a preliminary technique in the
investigation of illuminated manuscripts is discussed. Because ancient manuscripts are amongst the most
fragile and precious artworks, characterisation of the materials used in their decoration should be
performed using non-invasive analytical methods. Ultraviolet and visible reflectance spectrophotometry
with optical fibres (FORS) allows non-invasive identification of several colourants used by ancient
illuminators, causing no damage or mechanical stress to the artworks subjected to analysis. Identification
is usually based on the comparison of analytical data with a spectral database built from painted areas on
parchment, created by preparing paints according to ancient recipes as described in medieval technical
treatises. Such database and the spectral features of the colourants analysed are discussed, along with
the benefits of extending the spectral range of analysis into the shortwave infrared (to 2500 nm). FORS
can be best appreciated as a rapid preliminary tool that offers an overview on the main colourants
employed and guides the selection of painted areas of manuscripts on which more selective techniques,
such as X-ray fluorescence or Raman spectroscopy, can be employed for a more complete and accurate
identification
- …
