Publication

Survivability of integrated PVDF film sensors to accelerated ageing conditions in aeronautical/aerospace structures

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Bounding the Polynomial Approximation Errors of Frequency Response Functions

Zlatko Emedi

Frequency response function (FRF) measurements take a central place in the instrumentation and measurement field because many measurement problems boil down to the characterization of a linear dynamic behavior. The major problems to be faced are leakage an ...

Ieee-Inst Electrical Electronics Engineers Inc2013

Aging biomarkers

Johan Auwerx, Richardus Houtkooper

The present invention relates to novel biomarkers for aging and healthspan, methods and uses thereof, in particular, for determining the biological age of a subject and/or preventing or delaying aging process in a subject, and kits for use in said methods. ...

2013

The need for speed

Herbert Shea, Samuel Rosset, Pit Gebbers

Development of dielectric elastomer actuators has been mainly targeted towards achieving giant static strain with little attention paid to their response speed, which can, depending on materials used, be as long as tens of seconds. However, most of the pra ...

SPIE2012

Brownian motion in a Maxwell fluid

Sylvia Jeney, Matthias Grimm

The equilibrium dynamics of a spherical particle immersed in a complex Maxwell fluid is analyzed in terms of velocity autocorrelation function (VACF), mean-square displacement (MSD), and power spectral density (PSD). We elucidate the role of hydrodynamic m ...

Royal Society of Chemistry2011

Accelerated ageing and degradation in poly-L-lactide/hydroxyapatite nanocomposites

Pierre-Etienne Bourban, John Christopher Plummer, Claire Diane Delabarde

Dry, compression molded films of medical grade poly-L-lactide (PLLA) showed a marked reduction in tensile strength and strain after accelerated ageing in aqueous NaOH at 50 degrees C. accompanied by mass loss, surface erosion, increased hydrophilicity and, ...

Elsevier2011

Modal behavior of a reduced scale pump-turbine impeller. Part 1: Experiments

François Avellan, Mohamed Farhat, Eduard Egusquiza

An experimental investigation has been carried out to quantify the effects of surrounding fluid on the modal behavior of a reduced scale pump-turbine impeller. The modal properties of the fluid-structure system have been obtained by Experimental Modal Anal ...

International Association For Hydraulic Research2010

A novel low-profile shape memory alloy torsional actuator

Jamie Paik

This paper presents low-profile torsional actuators applicable for mesoscale and microscale robots. The primary actuator material is thermally activated Ni-Ti shape memory alloy (SMA), which exhibits remarkably high torque density. Despite the advantages o ...

2010

Signal Processing in Space and Time

Francisco Pereira Correia Pinto

Sound waves propagate through space and time by transference of energy between the particles in the medium, which vibrate according to the oscillation patterns of the waves. These vibrations can be captured by a microphone and translated into a digital sig ...

EPFL2010

Numerical-experimental identification of the elastic and damping properties in composite plates

Thomas Gmür, Alain Schorderet, Marco Matter, Joël Cugnoni

A novel method is presented for estimating the elastic and dissipative parameters of composite plates and shells through a mixed numerical-experimental identification procedure based on the natural frequencies, modal damping factors and mode shapes of the ...

2009

Identification modale numérique-expérimentale des propriétés élastiques et dissipatives de matériaux composites

Marco Matter

Composite materials undoubtedly belong to one of the most studied classes of materials nowadays. In order to model the behaviour of mechanical structures made of this type of materials, it is necessary to know their constitutive properties. The varieties o ...

EPFL2008