Alfons Vervaet

Lead-acid battery model for the derivation of Peukert’s law

Abstract In this paper a survey is given of the pros and cons of the existing models for the lead-acid battery. Next, a diffusion model is proposed which explains inter alia the occurrence of sharp lead sulfate walls observed earlier by Haebler et al. The model also leads to an expression similar to Peukert’s law. Finally, in order to account for secondary effects in the lead sulfate distribution the model has been extended to include a second internal diffusion mechanism.

Combining inorganic and organic gas sensors elements: a new approach for multi‐component sensing

Atmospheric dependent, gas sensitive resistors seem to be good candidates for detecting critical air pollution levels. Recently, great progress has been made in the development of various sensor types, but less attention seems to be paid to the integration of sensor elements with different characteristics. The aim of this international project is to develop a smart hybrid gas multi‐sensor module for environmental applications, i.e. by combining classical thick‐ and thin‐film elements with polymer‐film based sensors and also a signal processing ASIC within a single package, which should be useful for all sensor types. The module should enable multi‐sensor operation as well, when connected to an intelligent signal‐processing unit.

Low cost prototyping of multichip modules ‐ the European INCO‐Copernicus project

The opportunity for mutual benefit across Europe to develop low‐cost MCM technologies arose from recognition of the scientific skills and design and prototyping capabilities in organic and inorganic circuits in countries of Central Europe. As a result, the leading research institutions and small/medium‐size enterprises of Hungary, Romania and Slovenia together with relevant institutions of the UK and Belgium proposed and received approval for a European Union INCO‐Copernicus project “Cheap multichip models” to establish fast prototyping low cost multichip module (MCM) technology facilities. The project commenced in May 1997.

Solid-state coulometric titration study of sputtered CuxS layers

In this paper solid-state coulometry (SSC) is used as a technique to identify the composition of sputtered Cu x S layers. The effects of heat-treatments and electrochemical reduction on the film composition were also studied. Different methods to measure the stoichiometry index x were compared

On the interpretation of solid-state coulometry, used in studies of thin films of copper sulphide

Etude de la reduction electrochimique des couches minces de CuO et de Cu 2 S sur une electrode de cuivre