1,720,992 research outputs found
Monitoring of the Vibrations of Hermetic Compressors by Means of Identification Techniques
No full textControl of Acoustic Vibration Inside Refrigerator Compressors by means of Resonators. Comparison between Analytical and Experimental Results
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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
Dynamic response and noise emission of a reciprocating compressor shell
No full textThis study deals with the design of domestic refrigerator compressors for noise and vibration control. The shell which encloses the compressor is simulated with the FE method by means of the IDEAS code. Two different kinds of excitations are considered: the force transmitted by the discharge pipe and the forces transmitted by the suspension springs. The forced shell response is evaluated and the surface velocities are used to calculate sound power. Results show the influence of design parameters both on shell vibration and on noise emission
Discontinuous Nonlinear Evolution Equations: Broken Conservation Laws and Soliton Tunnelling
No full textThe problem of nonlinear evolution equations with discontinuous coefficients is investigated by extended use of the AKNS scheme and of the associated conservation laws, in view of an analysis of soliton fission and tunnelling. The employment of the motion constants evaluated by the broken conservation laws in the description of a tunnelling process for a nonlinear Schroedinger equation with a potential-like term is illustrated by a numerical experiment
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
Valutazione della potenza acustica prodotta dalla vibrazione di un compressore per la refrigerazione domestica
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