September 2000, Amsterdam - Projects - Hungary

Gabor Guta (20)
School: University of Debrecen
Hobbies: dancing, playing tennis
Career intention: program designer, mathematician

Stimulator with ultra low noise
The aim of this project was to construct an ultra low noise stimulator for cellular electrophysiological experiments. The stimulator is made up of two independent units: a pulse generator and a power amplifier. The pulse generator produces accurate binary signals and the power amplifier generates a square pulse with appropriate amplitude and without significant noise.
Operation of the pulse generator is based on a micro controller. Due to this construction the pulse width and cycle length can be adjusted continuously, and the control panel has an up-to-date design and is easy to use. The two units are connected through optical coupling. The power amplifier operates on an analogue basis. The stimulator (DS-R2) equipped with an isolated power amplifier developed for physiological research operates reliably in the desired range. It was tested successfully under laboratory conditions .

Ramon Hegedus (18)
School: Bolyai J nos Practicing Grammar School
Hobbies: listening to music, watching movies, visiting cultural events, doing outdoor sports
Career intention: physicist

Three dimensional fast photography of excimer laser ablation
Photoablation is a way of removing material using (excimer)lasers. It is used for material machining and tissue removals. It is a complex process and detailed investigation of the process is essential to improve currently applied techniques. Several researches were done (by others) on the modelling of ablation. But until recently no spatial visualisation has been made of the ablation plume, the things that happen where the laserbeam hits the surface. I have used a fast photography set-up with three video cameras to take snapshots of the ablation. After implementing the modelling method in a computer program, the images taken were processed and computer-based spatial models were created.
With my modelling method details currently unknown about ablation may be revealed. This way effects of the use of excimer lasers in surgery, for example, can be made more clear .