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Optical measurement method for mechanical time base characterization

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A Wearable System Of Micromachined Piezoelectric Cantilevers Coupled To A Rotational Oscillating Mass For On-Body Energy Harvesting

Nico de Rooij, Danick Briand, Pattanaphong Janphuang, Robert Andrew Lockhart

In this paper, we present a compact, wearable piezoelectric on-body harvesting system that uses a small eccentric mass from a common watch movement to mechanically deflect a set of micromachined piezoelectric cantilevers when excited by the low frequency m ...

IEEE2014

Concurrent validity of three measurement systems for the evaluation of cervical spine mobility

Kamiar Aminian, Cyntia Duc

In this study, we compared the cervical range of movement (ROM) and range of angular velocity (RAV) measured simultaneously using a 3-dimensional electrogoniometer, the CA6000-OSI (OSI), an optoelectronic motion capture system (MCS), the VICON® and a weara ...

2012

Conception acoustique de systèmes microtechniques

Jean-Daniel Lüthi

Considered as one of the most difficult complications in horology, the mechanical chiming watch, known as the striking watch, has today become one of the symbols of high craftsmanship. When it chimes the hour the sound of a striking watch must not only be ...

EPFL2011

Oscillator-based Walking Assistance: a Model-free Approach

Auke Ijspeert, Jesse van den Kieboom, Renaud Ronsse

In this paper, we further develop our framework to design new assistance and rehabilitation protocols based on motor primitives. In particular, we extend our recent results of oscillator-based assistance to the case of walking. The adaptive oscillator used ...

Ieee Service Center, 445 Hoes Lane, Po Box 1331, Piscataway, Nj 08855-1331 Usa2011

AIN Thin Film Structures for High-Q Resonators

Alvaro Artieda

The development of wireless and mobile communication in the last decade led to the elaboration of new components based on thin films with continually increasing performance and reduced fabrication cost. A fundamental element for mobile communication is the ...

EPFL2010

Epitaxial piezoelectric MEMS on silicon

Nico de Rooij, Danick Briand, Pattanaphong Janphuang, Don Isarakorn

This paper reports on the microfabrication and characterization of piezoelectric MEMS structures based on epitaxial Pb(Zr0.2Ti0.8)O-3 (PZT) thin films grown on silicon wafers. Membranes and cantilevers are realized using a sequence of microfabrication proc ...

Institute of Physics2010

Active Microelectromechanical Resonator

Daniel Grogg

The progress in the technology of microelectronic devices has led to a strong miniaturization and high performance for circuits and systems, enabling modern applications such as mobile computing and communications. Today, remaining "off-chip" components th ...

EPFL2010

Nanogap MEM resonators on SOI

Nicoleta-Diana Ciressan

Today's consumer electronics based on a large variety of time-keeping and frequency reference applications is based on quartz-crystal oscillators, because of their excellent performances in terms of quality factor, thermal and frequency stability. However, ...

EPFL2009

Nonlinear Stability of Riemann Ellipsoids with Symmetric Configurations

Using modern differential geometric methods, we study the relative equilibria for Dirichlet's model of a self-gravitating fluid mass having at least two equal axes. We show that the only relative equilibria of this type correspond to Riemann ellipsoids for ...

Springer-Verlag2009

Hybrid Control and Transport Using Bacteria-Driven Microbiorobots

Mahmut Selman Sakar

We are examining techniques for manipulation of microfabricated elements using arrays of bacteria as microactuators. Flagellated Serratia marcescens bacteria are attached to microstructures using a blotting technique that creates a bacterial monolayer carp ...

ASME2009