Publications de Peter Ryser | EPFL Graph Search

Optimisation of industrial production of low-force sensors – adhesive bonding of force-centring ball

Peter Ryser, Thomas Maeder, Caroline Jacq, Maxime Blot

This work addresses the issue of attaching the force-centring part (a round ball) to the load cell of a force sensor, a piezoresistive thick-film Wheatstone bridge deposited onto a ceramic cantilever. As the current soldering process requires expensive met ...

IOP2015

Enclosed Electronic System for Force Measurements in Knee Implants

Kamiar Aminian, Philippe Renaud, Peter Ryser, Arnaud Bertsch, Eric Meurville, Arash Arami, David Forchelet, Matteo Simoncini

Total knee arthroplasty is a widely performed surgical technique. Soft tissue force balancing during the operation relies strongly on the experience of the surgeon in equilibrating tension in the collateral ligaments. Little information on the forces in th ...

Mdpi Ag2014

Fabrication and Test of High-Temperature Ceramic Transformer

Peter Ryser, Thomas Maeder, Conor Joseph Slater

This work describes the fabrication and test of a high temperature (+200°C) capable high frequency transformer. It was manufactured using Low Temperature Co-fired Ceramic (LTCC) technology, which allowed the complex multilayer structure of ceramic and meta ...

2014

Tuneable PTC effect in polymer-wax-carbon composite resistors

Peter Ryser, Thomas Maeder, Caroline Jacq, Ludivine Ammon

Purpose: The resistivity dependence on temperature of composite resistors made of carbon fillers dispersed in an organic matrix are known to be strongly affected by the matrix thermal expansion. High positive temperature coefficient (PTC) effects, i.e. ess ...

Emerald2014

Quasiuniversal Connectedness Percolation of Polydisperse Rod Systems

Peter Ryser, Claudio Grimaldi, Biagio Nigro

The connectedness percolation threshold (eta(c)) and critical coordination number (Z(c)) of systems of penetrable spherocylinders characterized by a length polydispersity are studied by way of Monte Carlo simulations for several aspect ratio distributions. ...

American Physical Society2013

Depletion-interaction effects on the tunneling conductivity of nanorod suspensions

Peter Ryser, Claudio Grimaldi, Biagio Nigro

We study by simulation and theory how the addition of insulating spherical particles affects the conductivity of fluids of conducting rods, modeled by spherocylinders. The electrical connections are implemented as tunneling processes, leading to a more det ...

American Physical Society2013

Instrumented Knee Prosthesis for Force and Kinematics Measurements

Kamiar Aminian, Philippe Renaud, Pierre-André Farine, Peter Ryser, Catherine Dehollain, Arnaud Bertsch, Brigitte Jolles-Haeberli, Eric Meurville, Arash Arami, Steve Tanner

In this work, we present the general concept of an instrumented smart knee prosthesis for in-vivo measurement of forces and kinematics. This system can be used for early monitoring of the patient after implantation and prevent possible damage to the prosth ...

Ieee-Inst Electrical Electronics Engineers Inc2013

Effects of Thermal Losses on the Heating of a Multifunctional LTCC Module for Atomic Clock Packaging

Peter Ryser, Thomas Maeder, Fabrizio Vecchio, Conor Joseph Slater

An innovative multifunctional LTCC module has been designed for miniature atomic clock packaging. The components of miniature atomic clocks need to be efficiently packaged and connected to each other, and a precise temperature control is required for them. ...

Trans Tech Publications Ltd2012

Size-selective diffusion in nanoporous alumina membranes for a glucose affinity sensor

Peter Ryser, Jean-Michel Sallese, Eric Meurville, Christophe Boss

The retention, diffusion and structural properties of 2–4 nm nanoporous alumina membranes were investigated in view of their integration as size-selective interface in a glucose sensor. These membranes exhibit remarkable glucose diffusion properties with o ...

Elsevier2012

Test vehicle for studying thermal conductivity of die attach adhesives for high temperature electronics

Peter Ryser, Thomas Maeder, Fabrizio Vecchio, Conor Joseph Slater

Polymer adhesives offer a viable method for mounting silicon dies for high temperature applications. Here a test vehicle for comparing the thermal conductivity of different die attach materials is presented. The setup can be used to determine the degree of ...

Trans Tech Publications Ltd2012