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L’impiego delle onde elettromagnetiche per la disinfestazione da organismi xilofagi. La sperimentazione
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Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Get PDF“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
Get PDFWe 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
Selective shielding of RFID systems in presence of very high electromagnetic field levels
No full textThe paper addresses the issue of the
protection of data-carrying unit of a RFID system
during a microwave disinfestations treatment of
industrial wood pallets. This process is carried out
using microwave reverberation chambers, which
represents an efficient alternative to traditional
methods, also considering the velocity of the
treatment. As required by safety standards, the history
of the pallet must be at disposal of the user at any
time, and this can be easily accomplished mounting a
transponder on the pallet itself to store and retrieve its
data by the contactless reader of the RFID system.
The protection, against the microwave energy, of the
transponder mounted on the pallet can be assured
inserting it inside a selective shield that allows its
operation at the working frequency. To enhance the
efficiency of this selective shielding, the RFID
working frequency must be chosen as low as possible.
Three different solutions has been investigated in the
paper: the use of aluminium thin foils, the use of a
conductive elastomer and the use of conductive
plastic compounds. The evaluation of these solutions
has been carried out considering their loading effects
on the transponder coil, their shielding efficiency in
the microwave region and the compatibility between
the temperature reached during the pallet treatment
and the safety of the internal electronic chip. The
plastic metallised compound has resulted the most
suitable for the presented application
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