Essays about: "Stefan Johnsson"

Found 2 essays containing the words Stefan Johnsson.

1. 1. Automatic Slip Control for Railway Vehicles

   University essay from Institutionen för systemteknik

   Author : Daniel Frylmark; Stefan Johnsson; [2003]
   Keywords : Technology; Adhesion; control; railway vehicle; slide; slip; slip velocity; rls; fuzzy logic; TEKNIKVETENSKAP;

   Abstract : In the railway industry, slip control has always been essential due to the low friction between the wheels and the rail. In this master’s thesis we have gathered several slip control methods and evaluated them. These evaluations were performed in Matlab-Simulink on a slip process model of a railway vehicle. READ MORE

3. 2. Off-axis primary-dose measurements using a mini-phantom

   University essay from Lunds universitet/Sjukhusfysikerutbildningen

   Author : Stefan Johnsson; [1996]
   Keywords : Strålterapi; Medicine and Health Sciences;

   Abstract : The characterization of the incident photon beam is usually divided into its dependence on collimator setting (head-scatter factor) and off-axis position (primary off-axis ratio). These parameters are normally measured "in air" with a build-up cap, thick enough to generate full dose build-up at the depth of dose maximum. READ MORE