1,720,993 research outputs found
Galleria Civica d'Arte Contemporanea. Termoli . Catalogo Generale
No full textRiordino ,analisi critica e schedatura delle 450 opere di artisti italiani dal secondo dopoguerra ad oggi presenti nella collezione della Galleria Civica d'arte contemporanea di Termoli. Analisi della storia del "Premio Termoli", origine della collezione; presentazione e riodrino dei dati d'archivio e a stampa riguardanti il Premi
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
Two dimensional nuclear magnetic resonance relaxation (2D NMR-R) for archaelogical ceramics characterization
No full textTwo-dimensional nuclear magnetic resonance correlation maps as a signature of firing in iron-rich ceramics made from carbonatic raw clays
No full textWe investigate the correlated nuclear magnetic resonance (NMR) response of spin–lattice (T1) and spin–spin
(T2) relaxation times in iron-rich ceramics made from a carbonatic raw clay. The one-dimensional T1- and T2-
distributions tend to correspond to the size distribution of pores, but in the presence of large iron
concentrations T2 relaxation becomes more reactive to the magnetic configuration of the pore walls. Aiming at
contributing to the characterization of firing-induced ceramic properties, in this work we exploit the different
structural responsiveness of the two NMR relaxation parameters in the form of cross-correlation T1–T2
experiments. The test material has been properly chosen so as to observe large modifications of the porous and
magnetic features of the solid matrix. The sensitivity of this promising technique has been tested on samples
fired at different, but closely spaced, firing temperatures above first vitrification. The T1–T2 correlation maps
furnish a detailed picture of the structural rearrangements induced by even small changes of firing
temperatures, providing a sort of NMR fingerprint of the firing process which ceramics has undergone
Noninvasive monitoring of moisture uptake in Ca(NO3)2-polluted calcareous stones by1H-NMR relaxometry
No full textVariations 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
Two-dimensional longitudinal and transverse relaxation times correlation as a low-resolution nuclear magnetic resonance characterization of ancient ceramics
No full textLongitudinal and transverse relaxation time correlation T1-T2 is employed as a nuclear magnetic
resonance noninvasive characterization tool for archeological ceramics. This paper is aimed at
investigating whether the most relevant firing-induced changes in ceramics, including those
involving pore space properties and paramagnetic mineral structures, could be used as markers of
the firing process and therefore of ceramics themselves. Ancient ceramics are made up of naturally
available clays, often rich in iron impurities, which undergo relevant modifications of pore
distribution upon firing. The firing process also assists chemical and physical rearrangement of
iron-bearing species, yielding mineral structures with different magnetic properties. That being so,
T1-T2 maps are expected to show the interdependence between ceramic structure and firing
technology. T1 and T2 distributions are basically proportional to pore-size distribution, but T2, which
is also sensitive to magnetic susceptibility effects, may give information on the porous matrix
composition as well. Such a methodology has first been employed on laboratory-prepared ceramic
samples, with different paramagnetic compositions and controlled firing temperatures, in order to
tackle the problem of model-ceramic selection. Then, the T1-T2 correlation approach has been used
on medieval ceramic findings in order to get information about their thermal and compositional
history. The information obtained by means of two-dimensional correlation maps proves coherent
with archeological dating, thus illustrating the capabilities of this method
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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