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Oftentimes these systems are only statically calibrated. However, wheelchair propulsion is dynamic by nature, requiring a dynamic validation process. The aim of the current project was to present a low-cost portable system for the dynamic metrological verification of wheelchair roller ergometers, based on an instrumented reference wheel. The tangential force on the roller is determined, along with its uncertainty, from the reference wheel properties, and compared with the force measured by the ergometer. Uncertainty of this reference wheel system was found to be lower than the one of the ergometer used, indicating that this novel approach can be used for the metrological verification of ergometers.
Hoofdstuk 4 in Mediamonitor. Mediabedrijven en mediamarkten 2012-2013 De Mediamonitor heeft als taak om concentratiebewegingen van mediabedrijven in kaart te brengen en na te gaan in hoeverre de pluriformiteit en de onafhankelijkheid van de media in gevaar komen. In dat kader wordt in dit rapport uitgebreid stilgestaan bij de ontwikkelingen op de regionale dagbladenmarkt. Om de context te schetsen is lector Massamedia en Digitalisering Piet Bakker gevraagd in een gastbijdrage de algemene ontwikkelingen op de dagbladenmarkt in de afgelopen decennia in kaart te brengen.