From the Computarium Crew back
ASSELBORN, Jean-Claude (+ 2011) Konrad ZUSE et l'invention de l'ordinateur

ZUSE et la racine carrée

(Zuse and the computing of the square root)
Powerpoint presentation for the Computarium, Diekirch, 26 Oct. 2010. In French.

Supplementary part showing the solution of the square root by Zuse.
L'art du secret: Part 1, Part 2, Part 3 (unfinished) 3 first parts of a 5 part lecture series prepared by  Jean-Claude Asselborn. These conferences could not held due to his illness. 
Powerpoint. Mixed French and English.
BAUMANN, Claude Das Kalman Filter wird 50 Article in the Luxemburger Wort (18 March 2010); co-author Francis Massen. 
PDF. In German



Dynamic binaural sound localization based on variations of interaural time delays and system rotations

(JASA, 138 (2), Aug. 2015)

Claude Baumann, a Computarium crew member, has published an outstanding paper in JASA, the Journal of the Acoustical Society of America. The co-authors are Chris Rogers (Tuft University, USA) and Francis Massen (Computarium).
The paper gives new insights on how to locate a sound source in space, using calculations performed on the interaural delay-time. The PDF is here

[Copyright 2015 Acoustical Society of America. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the Acoustical Society of America. The following article appeared in JASA, vol. 138 (2), August 2015 and may be found at DOI: 10.1121/1.4923448 ]


BAUMANN, Claude Bringing back to life a COLINBUS Profiler CNC_Router

29 Mar 2021
A very extensive 62-pages report of the restoration of a Colinbus CNC profiler, an heritage of our late member Jean Mootz.

This is as a major research project by Computarium member Claude Baumann and also an original endeavor to combine modern stepper motor drivers, Arduino and self- developed electronic interface to revive a dead machine (which many would have thought being unsalvageable) which was sold in 2009 by the Elektor magazine as a kit.
The report contains a lot of physics and maths, as the author dwelled deep into into the problems of speed, acceleration, torque and other forces.

46 pictures or schemata.


MASSEN, Francis Analog Computers (.ppt)  (pdf version) Conference at the LCD held the 28th April 2017. Link to the Powerpoint presentation covering mechanical and electronic analog computers and calculators. Click here for the flyer.

Francis Massen
last edited: 29 Mar 2021