1,720,969 research outputs found
Mechanical and Electronic Amplitude-Limiting Techniques in a MEMS Resonant Accelerometer
No full textDynamic Non-Linear Behaviour of Torsional Resonators in MEMS
No full textThis paper reports the theoretical and experimental characterization of the dynamic behavior
of torsional resonators that can be applied to inertial sensors. For the correct operation of
the devices it is necessary to model the dynamic behavior of the electrostatically actuated
torsional resonators both in the linear and nonlinear range. A complete analytical model is
developed in this work including nonlinear terms in the electrostatic stiffness. This provides
clear quantitative information about the available linear range of operation and opens the way
to exploit the nonlinear range. The model is validated through comparison with experimental
data on two 22 μm thick polysilicon resonators having different distances from the underlying
electrodes
A differential resonant micro accelerometer for out-of-plane measurements
No full textThis paper reports the theoretical and experimental characterization of a new z-axis silicon resonant micro accelerometer
fabricated by the THELMA© surface micromachining technique, characterized by differential sensing and very small dimensions.
The working principle of this device is based on the variation of the electrostatic stiffness of two torsional resonators. This work
is a prosecution of the research on resonant accelerometers published in [1,2]
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
A Pierce Oscillator for MEMS Resonant Accelerometer with a novel Low-Power Amplitude Limiting Technique
No full text
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
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