1,721,372 research outputs found
CTS—A new X-ray facility for imaging and tomography @ XlabF
No full textX-ray based techniques are widely used in the world. However, high interactions between radiation and
matter causes a not so easy radiation handling by optical devices. In the last 30 years, the studies concerning
novel advanced material have fostered the development of several solutions for more efficient X-ray setup,
necessary to perform high spatial resolution analysis in spectroscopy as well as for imaging techniques applied
in Medicine/Pharmacology, Cultural Heritage, Geology and Environment, Electronics, Aerospace, etc.
Recent results (principally in three main fields, such as high resolution X-ray Imaging, micro X-Spectroscopy
and micro Tomography) obtained at XLab-Frascati (XlabF) were previously discussed while very recently, a
new experimental setup, dedicated for High Resolution X-ray Imaging and micron-Tomography, was developed as
a part of Italian Premiale project, called "Computed Tomography Station" (CTS). This apparatus is equipped
with a micro-focusing source (5 μm on the anode), high precision mechanics and high-resolution CCD detector
(10.4 μm per pixel), so as through the phase retrieval technique, we can reach the estimated resolution of less
than 1 μm. The CTS experimental setup was commissioned ad the beginning of 2023 and it is already ready
to be opened for internal and external users.
In this work, we will show the last results concerning our new experimental setup, related to the analysis
of a glass capillary, with different geometrical distances, and two organic samples entrapped in matrix amber.
Starting from these results, the next step is to use modern polycapillary optics as a grating interferometric
hexagonal matrix for a better phase-contrast resolution
Vescovi, capitolo e committenza artistica
No full textPrima di affrontare l’argomento è necessario fornire alcune note storiche sulla Cattedrale di Napoli senza le quali il discorso sulla committenza del capitolo e degli Arcivescovi sarebbe incomprensibile. Va detto, innanzitutto, che il complesso della Cattedrale è composto da un corpo principale, con transetto e tre navate, nelle quali si aprono una serie di cappelle gentilizie, la basilica di S. Restituta, a sinistra, e la Cappella del Tesoro di S. Gennaro, a destra. Tutti questi spazi godett..
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
X-ray applications and recent advances @ XLab Frascati
Full text linkXLab Frascati is a facility open to external users for different X-ray analyses, ranging from structural studies through X-ray diffraction to elemental mapping by means of μX-ray Fluorescence, colour tomography and X-ray imaging studies. This is possible thanks to our experimental layouts XENA (X-ray Experimental station for Non-destructive Analysis) and RXR (Rainbow X-Ray) along with our facility for the production of polycapillary optic
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
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