1,720,958 research outputs found
Improved Adapters for the Accurate Calibration of LISN Input Impedance
No full textThe paper deals with the accurate calibration of LISN impedance at the EUT port, focusing on the effects of parasitic parameters at the EUT side and their effects on calibration. The goal is to improve the calibration accuracy and repeatability by adopting a standardized external adapter, used to connect the measurement system to the LISN. Different models are analysed, both theoretically and experimentally, through meaningful experimental examples
Improved adapters for the accurate calibration of LISN input impedance
No full textThe paper deals with the accurate calibration of LISN impedance at the EUT port, focusing on the effects of parasitic parameters at the EUT side and their effects on calibration. The goal is to improve the calibration accuracy and repeatability by adopting a standardized external adapter, used to connect the measurement system to the LISN. Different models are analysed, both theoretically and experimentally, through meaningful experimental examples
Miglioramento delle caratteristiche di impedenza di modo comune delle LISN e del relativo metodo di taratura
No full textNel presente lavoro, mediante esempi e prove sperimentali, viene evidenziata la criticità della misura di ZIN nel caso di tipiche connessioni esterne con gli strumenti di mi-sura. Vengono esaminati gli aspetti relativi alla misura di ZIN, con particolare interesse al suo comportamento in modulo al crescere della frequenza. Sono infine proposti alcuni accorgimenti circuitali, che permettono di migliorare l’accuratezza e la ripetibilità del metodo di taratura delle LISN
La LISN, una rete semplice ma non troppo. Proposte per una taratura piu' accurata
No full textNel presente articolo, mediante esempi e prove sperimentali, viene evidenziata la criticità della misura dell'impedenza di ingresso Zin di una Lisn, con particolare interesse al suo comportamento al crescere della frequenza. Sono infine proposti alcuni accorgomenti circuitali che permettono di migliorare l'accuratezza e la ripetibilità del metodo di taratura di una Lis
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
Considerations about Radiated Emission Tests in Anechoic Chambers that do not fulfil the NSA Requirements
No full textIn this paper, some critical issues concerning the measurement of radiated emissions of
products in an electromagnetic compatibility test stage are dealt with. In particular, an approach is
proposed to evaluate the adequacy of anechoic enclosures that do not fulfil the requirements regarding
the normalized site attenuation (NSA) factor. The purpose is to suggest a test method that can be used
in order to define a way to know the limits of the chamber in terms of the frequency response over
some critical radiations. To this aim, a number of simulation analyses and experiments have been
performed for two different elementary types of radiating circuits (electric dipole, magnetic loop).
Investigations have also been made by varying the physical size of the antennas
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