1,720,972 research outputs found
Stress control tubes for HV cable termination with linear and non linear characteristics: theoretical and experimental approaches
No full textField distribution in cable terminations from a Quasi-static Approximation of the Maxwell Equations
No full textAnalysis of ultrawide-band detected partial discharge by means of a multiresolution digital signal-processing method
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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
Electroquasistatic Field Distribution in MV Cable Terminations Equipped with non-Linear Stress Control Tubes
No full textA significant stress control can be achieved, in cable terminations, using stress control tubes (SCTs), made of materials characterised by non-linear electric properties. In order to design reliable components we need an accurate evaluation of the electrical field distribution at the screen truncation and in the surrounding region. In this paper, the electric field is numerically evaluated in a domain comprising the termination and suitable surrounding regions adopting the electroquasistatic (EQS) approximation of Maxwell equations. A specific emphasis is given to the role played, on the field distribution, by different sets of boundary conditions resulting from distinct geometrical configurations and arrangements of the termination
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
Partial Discharges Measurements for Acceptance Testing of Resin-insulated Voltage Transformers
No full textIn acceptance testing of dry type, resin insulated instruments (voltage) transformers different partial discharges characteristics may be obtained by adopting the two arrangements suggested in the IEC 44-4 standard. Although the electric field distribution inside the component does not significantly depend on test arrangement, different partial discharge results are obtained. The unlike behaviours obtained by adopting the two set-ups are presented and explained. Some criticism to the present form of the standard is raised and suggestions of improvement are presente
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