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SourceAvailable from: Peter Kinnell
Conference Paper: Nonlinear Model for the Design of Stable MEMS Resonators[Show abstract] [Hide abstract]
ABSTRACT: A double-ended tuning fork resonator is shown to demonstrate nonlinear resonance. The geometric nonlinearity of the structure is modeled using finite element analysis. To validate the model the measured frequency response is curve-fit using Duffing's equation for nonlinear oscillators. The results validate the model, and show how a resonator may be designed for linear operation.Eurosensors; 04/2015
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ABSTRACT: This paper describes the potential for optimising a resonant gas sensor by using nano-textured surfaces. Initial empirical calculations determined that a device with a nano-textured active layer could have its surface area increased by an order of magnitude when compared to a device with an ideal theoretical smooth surface. These nano-textured surfaces are achieved when using the author's one step DRIE process. By carefully choosing the parameters when using the one step process the underside can be made to mimic porous silicon giving the user this vastly increased surface area on a micro and nano scale. After explaining how these surfaces are obtained this paper goes on to detail modelling work carried out to demonstrate the possible effects this new textured surface could have on the performance of future resonant gas sensors. A simple generic resonator is modelled with and without the new surface to give a clear indication of the improvement in signal performance that can be expected from future devices utilizing this new pseudo porous silicon as its active layer.Nanotec; 04/2015
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ABSTRACT: In this work we investigate how judgments of perceived duration are influenced by the properties of the signals that define the intervals. Participants compared two auditory intervals that could be any combination of the following four types: intervals filled with continuous tones (filled intervals), intervals filled with regularly-timed short tones (isochronous intervals), intervals filled with irregularly-timed short tones (anisochronous intervals), and intervals demarcated by two short tones (empty intervals). Results indicate that the type of intervals to be compared affects discrimination performance and induces distortions in perceived duration. In particular, we find that duration judgments are most precise when comparing two isochronous and two continuous intervals, while the comparison of two anisochronous intervals leads to the worst performance. Moreover, we determined that the magnitude of the distortions in perceived duration (an effect akin to the filled duration illusion) is higher for tone sequences (no matter whether isochronous or anisochronous) than for continuous tones. Further analysis of how duration distortions depend on the type of filling suggests that distortions are not only due to the perceived duration of the two individual intervals, but they may also be due to the comparison of two different filling types.Frontiers in Psychology 03/2015; 6(114):1-8. DOI:10.3389/fpsyg.2015.00114
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