Recherche

Afficher tous les résultats pour

Accueil

Personne

Peter Ryser

À propos
Confidentialité
Mentions légales

Graph Chatbot

Publications associées (68)

Page 2 sur 4

Electron tunneling in conductor-insulator composites with spherical fillers

Gianluca Ambrosetti, Thomas Maeder, Peter Ryser, Claudio Grimaldi, Niklaus Johner

We report on our Monte Carlo calculations of the conductivity of monosized and conducting spherical particles dispersed in a homogeneous matrix, with interparticle transport mechanism given by electron tunneling. We show that our numerical results can be r ...

2009

Tunneling conductivity in composites of attractive colloids

Peter Ryser, Claudio Grimaldi, Biagio Nigro

In conductor-insulator nanocomposites in which conducting fillers are dispersed in an insulating matrix, the electrical connectedness is established by inter-particle tunneling or hopping processes. These systems are intrinsically non-percolative and a coh ...

American Institute of Physics2012

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

Thomas Maeder, Peter Ryser, 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

Hermetic package for optical MEMS

Thomas Maeder, Jacques Jacot, Peter Ryser, Yannick Sébastien Fournier

This article describes the design and fabrication of a hermetic LTCC package for an optical MEMS chip designed for space applications. The package must ensure electrical and optical connections, mechanical positioning, atmosphere control, and finally low t ...

2009

Tuneable PTC effect in polymer-wax-carbon composite resistors

Thomas Maeder, Peter Ryser, Caroline Marguerite 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

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

Jean-Michel Sallese, Peter Ryser, 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

Instrumented Knee Prosthesis for Force and Kinematics Measurements

Steve Tanner, Kamiar Aminian, Philippe Renaud, Catherine Dehollain, Arnaud Bertsch, Peter Ryser, Eric Meurville, Pierre-André Farine, Oguz Atasoy, Brigitte Jolles-Haeberli, Arash Arami, Willyan Hasenkamp Carreira, Shafqat Ali, Matteo Simoncini

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

LTCC integrated miniature Rb discharge lamp module for stable optical pumping in miniature atomic clocks and magnetometers

Thomas Maeder, Peter Ryser, Herbert Shea, Vinu Lalgudi Venkatraman, Fabrizio Vecchio

We report here on an integrated mini-lamp module (15x26x4 mm3) with a microfabricated rf-powered Rb dielectric barrier discharge (DBD) lamp (10x10x3 mm3) positioned on top of a 0.6 mm thick (thickness adjustable) 4-layer LTCC (Low Temperature Co-fired Cera ...

IEEE2012

Dispensing and Hermetic Sealing Rb in a Miniature Reference Cell for Integrated Atomic Clocks

Thomas Maeder, Peter Ryser, Herbert Shea, Vinu Lalgudi Venkatraman, Fabrizio Vecchio

An innovative method for filling and sealing the reference cell for a Rubidium (Rb) integrated atomic clock is presented. We used a simple, low-temperature solder sealing technique for producing mini-cells of the size of 12 x 10 x 2 mm, suitable for Rb min ...

Elsevier2011

Transport properties of nonhomogeneous segregated composites

Gianluca Ambrosetti, Thomas Maeder, Peter Ryser, Claudio Grimaldi, Biagio Nigro

In conductor-insulator composites in which the conducting particles are dispersed in an insulating continuous matrix the electrical connectedness is established by interparticle quantum tunneling. A recent formulation of the transport problem in these kind ...

2011

Capacitive micro force sensors manufactured with mineral sacrificial layers

Thomas Maeder, Peter Ryser, Yannick Sébastien Fournier

In this work a prototype of micro force sensor of range μN...mN is presented. Instead of the traditional piezoresistive strain sensing through thick-film resistors used for higher forces, a more effective principle is used: measurement of beam displacement ...

2007

Tunneling and percolation transport regimes in segregated composites

Peter Ryser, Claudio Grimaldi, Biagio Nigro

We consider the problem of electron transport in segregated conductor-insulator composites in which the conducting particles are connected to all others via tunneling conductances, thus forming a global tunneling-connected resistor network. Segregation is ...

2012

Design and processing of low-range piezoresistive LTCC force sensors

Thomas Maeder, Peter Ryser, Giancarlo Corradini, Hansu Birol

Low-temperature cofired ceramic (LTCC) combines many advantageous features for low-range (force & pressure) piezoresistive sensors: ease of 3D structuration, availability of very thin sheets, low elastic modulus and yet reasonable mechanical strength. This ...

2005

Optimal percolation of disordered segregated composites

Thomas Maeder, Peter Ryser, Claudio Grimaldi, Niklaus Johner

We evaluate the percolation threshold values for a realistic model of continuum segregated systems, where random spherical inclusions forbid the percolating objects, modellized by hard-core spherical particles surrounded by penetrable shells, to occupy lar ...

2009

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

Formulation of composite resistive pastes for fabrication of micro-heaters

Thomas Maeder, Peter Ryser, Nathalie Sophie Adeline Serra

We investigate in this work the formulation of composite resistive pastes based on epoxy resins and graphite for micro-heater manufacturing via thick-film technology. These resistive pastes are designed for screen-printing onto a printed circuit board (PCB ...

Elsevier2010

Integrated SMD pressure/flow/temperature multisensor for compressed air in LTCC technology: Thermal flow and temperature sensing

Thomas Maeder, Peter Ryser, Yannick Sébastien Fournier

In this work, we present and analyse the flow-sensing part of a recently-developed multisensor in LTCC (low- temperature co-fired ceramic) technology; this device integrates flow / pressure / temperature sensing and is designed for diagnostics monitoring o ...

Elsevier2011

Tunneling-percolation origin of nonuniversality: Theory and experiments

Thomas Maeder, Peter Ryser, Claudio Grimaldi, Sonia Vionnet Menot

A vast class of disordered conducting-insulating compounds close to the percolation threshold is characterized by nonuniversal values of transport critical exponent t, in disagreement with the standard theory of percolation which predicts t ...

2005

Structuration of the low temperature co-fired ceramics (LTCC) using novel sacrificial graphite paste with PVA–propylene glycol–glycerol–water vehicle

Thomas Maeder, Peter Ryser, Caroline Marguerite Jacq

A novel formulation for thick-film graphite sacrificial pastes is studied in this paper. It is composed of coarse graphite powder (grain size: 25 μm), dispersed in a vehicle consisting of polyvinyl alcohol (PVA) dissolved in a propylene glycol (PG)–glycero ...

Elsevier2011

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

Thomas Maeder, Peter Ryser, Caroline Marguerite Jacq

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