Concept

Output impedance

Publications associées (187)

Modeling and characteristics comparison of two different piezoelectric transformers

Yves Perriard, José Fernandez Lopez, Jan Holzbecher, Michel Stutz

Electromagnetic transformers have become obstacles to progress power supply miniaturization. Thus, piezoelectric transformers, which are more compact, immune to magnetic field and that present a high galvanic insulation, become more and more an alternative ...

2005

Experimental study of the dependence of the damping rate of n=1 TAEs on the on-axis safety factor and toroidal rotation shear

Ambrogio Fasoli, Duccio Testa

The dependence of the measured damping rate (gamma/omega) on the value of the safety factor on axis (q(0)) and of the toroidal rotation shear has been experimentally determined for n = 1 toroidal Alfven eigenmodes (TAEs) in JET limiter plasmas with a monot ...

2005

Microelectrical impedance tomography for biophysical characterization of thin film biomaterials

Philippe Renaud, Olof Pontus Linderholm, Reto Bruno Schoch

We present a new method for measuring the electrical resistivities of a stratified sample of thin biomaterials or tissue layers. The presented technique makes use of impedance measurements between It pairs of electrodes separated by varying distances. The ...

2003

Measurement of the damping rate of n=1 toroidal Alfven eigenmodes as a function of the neutral beam heating power and plasma beta on JET

Ambrogio Fasoli, Duccio Testa

The dependence of the measured damping rate upon the neutral beam heating power (P-NBI) and plasma beta has been experimentally investigated for n = 1 toroidal Alfven eigenmodes (TAEs) in JET limiter plasmas with a monotonic safety factor profile and low e ...

2003

Experimental test of damping models for n=1 toroidal Alfven eigenmodes in JET

Olivier Sauter, Ambrogio Fasoli, Duccio Testa

The damping rate of the n = 1 toroidal Alfven eigenmodes (TAE) mode in Ohmic-heated JET plasmas has been measured and compared with the prediction of the kinetic NOVA-K code, which includes electron and ion Landau damping of the global shear-Alfven wave fi ...

2003

Determination of Chemical Diffusion and Surface Exchange Coefficients of Oxygen by Electrochemical Impedance Spectroscopy

Jan Van Herle, Stefan Diethelm, Alexandre Closset

A rigorous mathematical model is developed for the complex impedance of a solid-state electrochemical cell, which is commonly used for the measurement of oxygen transport, oxygen exchange kinetics and thermodynamic properties of nonstoichiometric mixed con ...

2002

Giant Magneto-Impedance in multilayers of magnetic amorphous ribbons

Martinus Gijs, Farid Amalou

We have patterned multilayers of amorphous magnetic foils of Metglas/sup /spl reg// 2714a (cobalt-based) and Cu foil into microstructures of different sizes. We have studied the GM effect in these structures, and we have characterized the behavior of the r ...

2002

Loudspeaker behaviour under incident sound fields

Véronique Adam

Within the framework of an outdoor active noise control project, a need arose, namely to establish whether electrodynamic loudspeakers are likely to be affected by the primary noise or by the interactions between them. The aim of this thesis is therefore t ...

EPFL2002

Technical and Economical Impacts on a Power System by Introducing an HTS FCL

Marten Sjöström

Fault current limiters (FCLs) can be considered as key elements in power systems using high temperature superconductors. This analysis takes into account the system benefits provided by the introduction of FCLs in various network configurations. New meshin ...

2001

Micromachined impedance spectroscopy flow cytometer for cell analysis and particle sizing

Philippe Renaud, Shady Didier Gawad

A new cytological tool, based on the micro Coulter particle counter (CPC) principle, aimed at diagnostic applications for cell counting and separation in haematology, oncology or toxicology is described. The device measures the spectral impedance of indivi ...

2001

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