UVC Seed Sterilization BSc Thesis: LED Driving and Sensing Unit

This thesis describes the design and implementation of a LED Driving and Sensing Unit, one of the parts of a UV-C LED sterilization machine for the disinfection of plant seeds. The purpose of this part is to drive LEDs which can destroy different structures of pathogens. While doing this, certain parameters like temperature and ozone generation...

The effect of ionizing radiation on 1O2 production by Ce6 and TiO2

Photosensitizers play a key role in photodynamic therapy as a drug that is activated by light. In this thesis, the effect of ionizing radiation on the generation of singlet oxygen when using photosensitizers (Chlorin e6) and photocatalysts (titanium dioxide) was studied. By using radionuclides and photosensitizers (PS), cells can be killed with...

Modelling of heat transfer by radiation

Heat transfer by radiation is something you experience everyday: when walking outside in the sun or when cooking your diner. This thesis provides understandable models of the role that radiation plays in the transfer of heat. By studying literature we developed a mathematical basis for the heat transfer model, where we discuss diffusive,...

The Biological Effects of Breathing Interplay in Proton Therapy Treatments

During proton therapy treatments of lung tumors, interplay effects occur due to the simultaneous movement of the tumor due to patient’s respiratory breathing motion and the scanning pencil beam. These effects make delivering the dose to the target challenging. In this project the biological effects of breathing interplay for proton therapy...

An exact solution for dipole fields inside optical multilayer structures

In this report, we derive some tools that can be used to construct semi-analytical solution for the electromagnetic field of a dipole in an arbitrary multilayer system. The proposed methods consist of a recursive determination of electric fields -- using the mathematical principle behind a Fabry-Perot interferometer -- and two different...

Data analysis of measurements on the detection of Josephson radiation

In this report an overview of the techniques used to perform measurements on a Josephson radiation detector is given. This experiment could lead to the observation of Majorana bound states, which can be used to realize a topological quantum computer. Software for the plotting of data from one- and two-variable measurements was developed, with...

Slimme multi-criteria optimalisatie voor radiotherapie

For multi-criteria optimization of radiation therapy treatment planning, several methods can be used. One method, the 2-phase ?-constraint method, is to optimize each criterium, one at a time, to find an optimal radiation plan. The disadvantage of this method is that it takes a lot of computation time. The purpose of this thesis is to...