Concept

Bloc fonctionnel

Publications associées (244)

Synchronous Generator No-Load Voltage Prediction using a Combined Analytical and FEM Approach.

Jean-Jacques Simond, Mai Tu Xuan, Stefan Keller

A combined analytical and FEM method for prediction of the no-load voltage waveform of laminated salient pole synchronous generators is presented in this article. Very precise prediction of the no-load voltage, including saturation effects as well as the e ...

2005

Influence of electrolyte in transport and recombination in dye-sensitized solar cells studied by impedance spectroscopy

Ulf Anders Hagfeldt

The main features of the characteristic impedance spectra of dye-sensitized solar cells are described in a wide range of potential conditions: from open to short circuit. An equivalent circuit model was proposed to describe the parameters of electron trans ...

2005

Improving tokamak vertical position control in the presence of power supply voltage saturation

Philippe Müllhaupt, Jonathan Bryan Lister, Jean-Yves Favez

The control of the current, position and shape of an elongated cross-section tokamak plasma is complicated by the so-called instability of the current vertical position. Linearized models all share the feature of a single unstable eigenmode, attributable t ...

Institute of Physics2005

Prediction of the No-Load Voltage Waveform of Laminated Salient-Pole Synchronous Generators.

Jean-Jacques Simond, Mai Tu Xuan, Stefan Keller

This paper presents a combined analytical and FEM method for prediction of the no-load voltage waveform of laminated salient-pole synchronous generators. The described method takes into account saturation effects as well as the damper bar currents due to t ...

2005

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

Assessment of irradiation-hardening on Eurofer97' and Zircaloy 2 with punch tests and finite-element modeling

Philippe Spätig, Emiliano Campitelli

We present an assessment of the mechanical constitutive behavior after irradiation for a tempered martensitic steel, Eurofer97', and for Zircaloy by means of small-ball punch tests. For that purpose we use a finite-element model of the punch test device. W ...

2005

Crossover from capacitive to pseudoinductive charge-relaxation in organic/polymeric light-emitting diodes

Frank Nüesch, Libero Zuppiroli

In this work we propose a phenomenological microscopic approach to deal with pseudoinductive charge-relaxation processes (named also as negative capacitance phenomena) in organic molecules (tris-8-hydroxyquinoline-aluminum) and polymeric [poly(2-metoxy-5-( ...

AIP2005

Analysis of lumped parameter models for blood flow simulations and their relation with 1D models

Alfio Quarteroni

This paper provides new results of consistence and convergence of the lumped parameters (ODE models) toward one-dimensional (hyperbolic or parabolic) models for blood flow. Indeed, lumped parameter models (exploiting the electric circuit analogy for the ci ...

2004

Numerical modelling of high temperature superconducting tapes and cables

Francesco Grilli

This Ph.D. thesis is focused on the numerical modelling of high-Tc superconductors (HTS) at the operating temperature of 77 K (liquid nitrogen). The purpose of numerical modelling is to precisely calculate the current and field distributions inside HTS dev ...

EPFL2004

Dielectric spectroscopy in a micromachined flow cytometer: theoretical and practical considerations

Philippe Renaud, Arnaud Bertsch, Shady Didier Gawad, Urban Seger, Karen Cheung

We propose a model to determine the influence of different cell properties, such as size, membrane capacitance and cytoplasm conductivity, on the impedance spectrum as measured in a microfabricated cytometer. A dielectric sphere of equivalent complex permi ...

2004

Graph Chatbot

Chattez avec Graph Search

Posez n’importe quelle question sur les cours, conférences, exercices, recherches, actualités, etc. de l’EPFL ou essayez les exemples de questions ci-dessous.

AVERTISSEMENT : Le chatbot Graph n'est pas programmé pour fournir des réponses explicites ou catégoriques à vos questions. Il transforme plutôt vos questions en demandes API qui sont distribuées aux différents services informatiques officiellement administrés par l'EPFL. Son but est uniquement de collecter et de recommander des références pertinentes à des contenus que vous pouvez explorer pour vous aider à répondre à vos questions.

Connectez-vous pour utiliser Chat avec Graph Search