1,720,967 research outputs found
Tecniche per l’identificazione di sorgenti sonore: confronto tra beamforming e olografia acustica
No full textUtilizzo di array microfonici per la localizzazione di sorgenti sonore: confronto tra diverse configurazioni dei microfoni e validazione sperimentale
No full textAnalisi della variabilità dei parametri modali di una struttura civile ai fini della possibile identificazione di danni attraverso l’analisi modale operazionale
No full textMechanical performance and metrological characterization of MEMS accelerometers and application in modal analysis
No full textMEMS (Micro-Electro-Mechanical-System) technology is providing inertial sensors to industry, with a low cost manufacturing technology and miniature dimensions capabilities (few millimeters). Nowadays MEMS sensors are widely used in low-accuracy level applications (typically in the automotive field), where cost and dimensions are priority advantages. Starting from these considerations chip producers do not focus on the sensors metrological characterization and on a packaging useful for mechanical measurements. Moreover testing costs, much higher than the cost of sensor itself, make a full mechanical testing not so common. Producers mainly focus on the electrical characterization, and anyway not so much care is devoted to the mechanical facts end users have to fight against. The aim of this paper is to give a contribution, investigating the possibility of using MEMS transducers in applications that require higher performances, such as modal testing or structural health monitoring. This paper contains a complete mechanical characterization of some MEMS sensors in comparison with other traditional accelerometers, piezoelectric and servo ones. The purpose of these tests is therefore to determine their performances in different ambient conditions, aimed to their use during experimental and operational modal analysis or in monitoring applications on big civil structures
Force measurement during gait therapy assisted by a robotic treadmill - The case of Lokomat®
No full textThe present paper deals with force measurement during gait therapy assisted by a special robotic treadmill with driven robotic orthoses that guide inferior limbs movements. The objectives, the measurement setup and the results are presented. This work has been carried out in order to gather data necessary to begin the analysis and the design of a new ankle motion device. The presented results also show how these measurements can be useful in gait parameters assessment and patient's muscle activity level
Utilizzo di array microfonici per la localizzazione di sorgenti sonore: confronto tra diverse configurazioni dei microfoni e validazione sperimentale
No full text
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
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
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