86,538 research outputs found

    Effect of Dead Volumes on Single Closed Loop Pulsating Heat Pipes

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    Pulsating Heat Pipes (PHPs) are novel promising two-phase passive heat transfer devices that seem to meet all present and possibly future thermal requirements. Although grouped as a sub-class of the heat pipes, the PHPs governing phenomena are quite unique and not fully understood yet. In particular, single closed loop PHPs, that might be considered as the basic constituents of multi turns PHPs, manifest a large number of drawbacks mostly related to the device thermal performance and reliability, i.e. the occurrence of multiple quasi-steady states during device operation. Many attempts have been made in literature in order to face the problem and promote the circulation of the working fluid in a preferential direction. In order to understand the effect of dead volumes on the PHP working regimes and on its stability, two slightly different versions of the single closed loop PHP showed in figure 1 (inner tube diameter of 2.0 mm, filled with ethanol 60 % vol.) are tested

    Variations on the Author

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    “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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