Acoustic neutrino detection is a promising method to observe ultra high energy neutrinos. These neutrino with energies larger than 10$^{18}$ eV have a relatively low expected flux, thus a large...Show moreAcoustic neutrino detection is a promising method to observe ultra high energy neutrinos. These neutrino with energies larger than 10$^{18}$ eV have a relatively low expected flux, thus a large instrumented volume is required. Current estimations give an instrumented volume of around O(100) km$^3$ using hydrophones as the detection modules. Measuring ultra high energy neutrino would provide us with crucial information on extragalactic sources, the GZK cut-off, and also the C$\nu$B. In this work, an event detection algorithm based on clique, a subspace clustering algorithm, was developed. Furthermore, a first look at event reconstruction was taken. Ultra high energy neutrino events with energies of roughly 5 $\cdot$ 10$^{19}$ eV were approximated by using their characteristic pancake shape. An instrumented volume of 4 km$^3$ was simulated. The study has shown that a hydrophone density of 400 per km$^3$ would provide the desired detection efficiency of near 100\%. At these values a noise rate of 5 Hz can be suppressed using an amplitude criterion besides a causality one. A causality criterion alone suppresses a noise rate of 0.5-0.6 Hz. Furthermore, it was found that a configuration utilizing multiple detector blocks would maximize the effective volume of the detector. Moreover, the hydrophones should be designed for a sensitivity in the range of 0-15 kHz. The reconstruction algorithm tested did not provide the desired results, it is recommended to develop an algorithm specifically for acoustic neutrino detection. We found that design of the detector is a balancing act between detection efficiency, detector size, and noise suppression. Finally, this study demonstrates the possibility of using a clique based approach for event detection in ultra high energy neutrino detection. However, we recommend the development of noise suppression algorithms at the single waveform level, as suppression of a noise rate of 0.5-0.6 Hz or 5 Hz, depending on match criteria, is not enough based on previous research, in which noise rates can be as high as 26 Hz in low noise environments. Machine learning approaches show the most promise here.Show less
In this thesis, a state-of-the-art Nanoscribe 3D printer is used to fabricate micron-sized particles. These particles are then partly covered with platinum and suspended in hydrogen peroxide to...Show moreIn this thesis, a state-of-the-art Nanoscribe 3D printer is used to fabricate micron-sized particles. These particles are then partly covered with platinum and suspended in hydrogen peroxide to become chemically propelled, active particles. First, it is shown that 3D-printing can indeed be used to fabricate active particles, by fabricating some relatively simple 4 µm spheres. Subsequently, different helical particles are designed and fabricated to discover that some designs can be printed consistently with the same outcome and that some cannot. A consistently printed helical particle is then analyzed to investigate the relationships between its active motion and its helical shape.Show less
Research master thesis | Linguistics (research) (MA)
open access
This thesis focuses on the relation between preference and particles. It researches the modal particles 'even', 'maar' and 'misschien', used in informal telephone conversations. I analyse all...Show moreThis thesis focuses on the relation between preference and particles. It researches the modal particles 'even', 'maar' and 'misschien', used in informal telephone conversations. I analyse all occurrences of these particles in a second pair part that answers a question, to be able to see if these mitigating particles are used to mitigate the non-preference, as expected.Show less
Research master thesis | Classics and Ancient Civilizations (research) (MA)
open access
The conditional clause is one of the most common and important clause types in Biblical Hebrew, yet no consensus has been reached as to how its various forms correspond to the expression of...Show moreThe conditional clause is one of the most common and important clause types in Biblical Hebrew, yet no consensus has been reached as to how its various forms correspond to the expression of modality, most notably whether a condition is realizable or not. In this paper, it is analyzed how the two main factors of conditional sentences, particles and verbal forms, combine to add modal nuances to the conditional clause. It becomes clear that not a single factor is responsible for those nuances, but many factors combined. By applying modern linguistic insights in particles and the verbal forms, a new model is proposed.Show less
