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Passive and Active Calibrators Characterization by using a Spaceborne SAR System Simulator
No full textPreliminary Design of the Attitude Control System of a Micro-Satellite for Earth Observation
No full text
Passive and Active Calibrators Characterization by using a Spaceborne SAR System Simulator
No full textPreliminary Design of the Attitude Control System of a Microsatellite for Earth Observation
No full textIn this paper a low-weight, low-power magnetic attitude control system, consisting of three magnetic torquers, two magnetometers and a horizon sensor, is proposed for a microsatellite carrying a remote sensing payload on a Sun-synchronous orbit. Linear control laws are derived by making use of an attitude analytical model. The performance of the attitude control system is evaluated by using a numerical code which models the system orbital and attitude dynamics, and the sensor and attitude measurement errors. Final results show that the proposed preliminary design of the attitude control system allows the attitude angles to be kept within values adequate to the considered application
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
Variations 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
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