1,721,145 research outputs found
Near-field coupling in UHF-RFID printer-encoders
No full textIn the framework of Near-field (NF) UHF-RFID applications, printer-encoder antennas represent an interesting scenario to investigate. In commercial RFID printer-encoders, the distance between the encoder and transponder antennas is typically a few millimeters only, and the encoder antenna has to reliably communicate with only one targeted tag among a number of tightly spaced transponders in very close proximity. In this paper, a number of encoder antenna layouts have been numerically analyzed in terms of power delivered to the transponder chip, by considering two commercial RFID tags. Moreover, the spatial selectivity of the encoder antennas is estimated. As a result, a reader antenna identical to the tag antenna is suggested as an optimal solution for meeting the severe requirement on the spatial selectivity of the encoding process
The Peak Stress Method applied to fatigue assessments of steel tubular welded joints subject to Mode-I loading
No full textThe paper presents the practical aspects involved in structural design of tubular joints
mainly employed in roller coasters manufacturing. Different design standards, commonly
adopted in fatigue assessments, are considered and compared. Then some constant amplitude
fatigue test results concerning typical tubular welded joints are presented. Finally the
experimental results and additional test data taken from the literature are compared with
the theoretical estimations based on the Peak Stress Method, which has been recently
conceived and proposed as a simplified, application-oriented version of the well known
Notch-Stress Intensity Factor approach. The results indicate that the Peak Stress Method
is suitable to estimate the fatigue life up to crack initiation of tubular welded joints subject
to mode-I loading
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
Primary leiomyosarcoma of the lung in a girl.
No full textLeiomyosarcoma of the lung is a type of tumour rarely found in childhood. It arises from smooth muscle either of bronchial or arterial walls, has a variable pattern of local growth, blood-borne metastatic spread with lymph nodes sparing and a clinical course characterized by fever, cough and worsening dyspnea. We report a case which occurred in a 14-year-old girl, reviewing all the other cases found in the literature
T-cell infiltrate in Lichen Planus. Demonstration of activated lymphocytes using monoclonal antibody.
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