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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
Modular multilevel converter: theoretical analysis and capacitor voltage ripple effects
No full textA theoretical analysis of the Modular Multilevel Converter is presented. The interaction between arm currents and modulating signals causes capacitors voltage oscillation at both fundamental frequency and twice the fundamental frequency. Capacitors voltage oscillation is the cause of undesired DC and second order harmonic voltage in the converter arms, besides an additional voltage at the fundamental frequency. All these components are compensated modifying the ideal modulating signals by means of additional DC, first and second order harmonic signals
Effects of the 2nd order harmonic leg current in a MMC converter
No full textIn this paper an exhaustive analysis of the utilization of the second harmonic component of the circulating currents in a modular multilevel converter for HVDC application is presented, with the aim of highlighting the effects on the maximum arm energy ripple, i.e. capacitors voltage ripple, and on semiconductor losses. Simulation results are presented and design remarks are indicated
Design Tools of DC EAF Power Supply Systems for Optimum Reduction of Flicker and Interharmonic Disturbances
No full textVariations 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
Analysis of interharmonics in DC arc furnace installations8th International Conference on Harmonics and Quality of Power. Proceedings (Cat. No.98EX227)
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