1,721,298 research outputs found
Structural and surface-characterization techniques
No full textIn this paper, we will give some salient descriptions of the use of X-rays to investigate the properties of optical materials
Er<sup>3+</sup>/Yb<sup>3+</sup>/Ce<sup>3+</sup> Co-Doped Fluoride Glass Ceramics Waveguides for Application in the 1.5µm Telecommunication Window
No full textEr3+-doped fluoride glass ceramics planar waveguides containing LaF3 or binary LaF3-
ZrF4 nanocrystals have been fabricated by Physical Vapour Deposition (PVD). A quantitative
analysis of the photoluminescence for the 1.5μm emission band of Er3+ ions has demonstrated that
erbium ions are partitioned in both crystals and vitreous phase; the solubility of Er3+ in the
segregated LaF3 nanocrystals can reach 30 mol% and the emission bandwidth has been found to be
greater than that of the precursor glass (71nm at the half-height width). In order to increase the
luminescence of Er3+, codoping with Yb3+ and Ce3+ has been investigated. The high Er3+
concentration and spectral width could make this nanostructured fluoride material suitable for
planar amplifier in the C telecommunication band.</jats:p
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
Paraloup: un modello di rinascita della montagna
Full text linkArticolo a firma di Maurizio Ferrari presidente dell'Associazione culturale Amo la Montagna Editore della "Voce della Montagna" sul recupero della borgata Paraloup: "Il recupero è iniziato con l'acquisto da parte della Fondazione Revelli delle baite di questa piccola borgata alpina ed un team di architetti (Dario Castellino, Valeria Cottino, Giovanni Barberis, coordinati dal professor Daniele Regis del Politecnico di Torino) si è occupato del progetto che, fra l'altro, è stato presentato anche alla Biennale di Architettura di Venezia, nel 2012, ed ha ricevuto particolare menzione al Premio Konstruktiv come migliore architettura alpina in ambito europeo". (Maurizio Ferrari
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
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