Effects on performance and durability on PEMFC during oxygen starvation by measuring and modeling the current distribution along the cell

International audienc

Determination of current density distribution in proton exchange membrane fuel cells

This study is to look at the distribution of current densities in proton exchange membrane fuel cells (PEMFC) to enable optimisation of fuel cell performance. The feasibility of using a new measurement technique of the local magnetic field, in the conductive plates of the cell was studied. The magnetic field is measured throughout the cell using the Maxwell equations and the current densities calculated. The measurement system and its validation are outlined in the first section. The next section outlines the experimental current density distribution within the cell, operating under standard conditions and special configurations, such as the partially active membrane electrodes assembly (MEA). Using a Matlab or Femlab model of the cell, (which is briefly outlined) our experiments are compared and an attempt made to explain the distribution of the current densities. Finally recent developments of the device are described, which will be used in several tests of PEMFC small stacks

Etude comparative des consommables pour le dosage des endotoxines bactériennes chez deux fournisseurs

Les endotoxines bactériennes (EB) sont des pyrogènes, leur recherche est obligatoire pour certains produits pharmaceutiques. La Pharmacie à Usage Intérieur (PUI) réalise en moyenne 3600 dosages des EB par an selon la méthode colorimétrique cinétique. Le temps de réaction enzymatique pour cette méthode cinétique est fortement impacté par la qualité de ces consommables. L'objectif est de comparer l'effet des réactifs sur le dosage des EB chez 2 fournisseurs (A et B) et l'impact financier relatif aux coûts de ces consommables pour chacun d'eux

Modelling of the lightning connection process to a ground structure

This paper describes a self consistent model of the attachment of a negative stepped leader to a ground structure. The computed results are compared with current and electric field measurements obtained during a triggered lightning campaign performed at Camp Blanding (Florida) in summer 199

Simulation experimentale de la connexion d'un leader negatif descendant sur une structure au sol : observations

Communication to : Foudre et montagne 97, Chamonix (France), 1-5 juin 1997SIGLEAvailable from INIST (FR), Document Supply Service, under shelf-number : 22419, issue : a.1997 n.75 / INIST-CNRS - Institut de l'Information Scientifique et TechniqueFRFranc

Modelling of the lightning connection process to a ground structure

Communication to : 33rd International conference on lightning protection (ICLP), Florence (Italy), September 23-27, 1996Available at INIST (FR), Document Supply Service, under shelf-number : 22419, issue : a.1996 n.59 / INIST-CNRS - Institut de l'Information Scientifique et TechniqueSIGLEFRFranc