1,721,009 research outputs found
FEM-based evaluation of manifacturing tolerances on a millimeter-waves rectangular to coplanar waveguide transition
No full textRectangular to Coplanar Waveguide hermetic transitions are frequently used in satellite payloads, to interconnect rectangular waveguides toward antennas with internal active circuits, often realized in MMIC technology. In this contribution, the effects of manufacturing tolerances on this kind of transitions are analyzed both in qualitative terms and in quantitative ones using a Monte Carlo method applied to FEM electromagnetic simulations. Results are compared with measures on a W-Band prototype
Valutazione tramite il metodo degli elementi finiti dell’effetto delle tolleranze di lavorazione sul comportamento elettromagnetico di una transizione a onde millimetriche
No full textValutazione tramite il metodo degli elementi finiti delle tolleranze di lavorazione sul comportamento elettromagnetico di una transizione ad onde millimetriche
No full text
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
Coplanar-to-rectangular waveguide millimeter-wave transitions manufacturing tolerance analysis using the finite-element method
No full textA 94.5-GHz coplanar to rectangular transition for satellite telecommunications is analyzed via the finite-element method (FEM). Particular attention is devoted to the effects of manufacturing tolerances, and a full statistical behavior, extracting the effects of single geometrical details, is presented. Obtained data are validated by the measurements of the prototypes. (c) 2006 Wiley Periodicals, Inc
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
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