The goal of this thesis is to design a setup which can be used as a prototype for the TECH reactor. The TECH reactor is a cylinder with rounded edges, in which a microwave plasma will be formed....Show moreThe goal of this thesis is to design a setup which can be used as a prototype for the TECH reactor. The TECH reactor is a cylinder with rounded edges, in which a microwave plasma will be formed. The cavity should resonate with the right eigenmode at a constant frequency of 2.45 GHz, and the excitation structure should produce a reflection coefficient of smaller than 0.8, enabling a tuning device to maximize power transfer. These conditions must hold for a broad range of conductivities of the plasma. Firstly, the effect of a resonance frequency tuning ring inside the cavity was researched, in order to keep the right eigenmode at a constant frequency of 2.45 GHz. Secondly, the excitation structure was optimized to ensure that at the relevant plasma conductivities, the reflections from the setup were minimized. Later simulations yielded that for almost all conductivities of the plasma, the setup was sufficiently impedance matched to the waveguide to enable an auto tuning device to prevent reflections. Thirdly, unexpected eigenmodes of the cavity were discovered. Therefore, adjustments were made to the cavity such that the resonance frequencies of other modes would not be close to 2.45 GHz, to prevent the excitation of these modes. This thesis continued the work of De Man [3]. In the end, the simulations yielded promising results and the setup is almost fully designed. Soon, experiments with the electric field in the cavity can be carried out, which form an important step towards being able to measure plasma breakdown.Show less
If the process of conversion is gradual, what part of the process is influenced by a particular evangelistic strategy? And if conversion means that the old and the new get mixed, then what is the...Show moreIf the process of conversion is gradual, what part of the process is influenced by a particular evangelistic strategy? And if conversion means that the old and the new get mixed, then what is the role of evangelism in this? For my thesis, I want to use these new perspectives on conversion to analyze the role that evangelism plays in people's conversion stories. My main question will be the following: “What role do evangelistic efforts by growth-oriented churches in Leiden play in people's conversions and how can this influence be explained?”Show less
Bachelor thesis | Oude culturen van de mediterrane wereld (Bachelor)
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Het fenomeen bekering in de Joods-Hellenistische wereld wordt besproken aan de hand van de Joods-Hellenistische roman 'Joseph en Aseneth', een verhaal over de aartsvader Jozef en bekering van zijn...Show moreHet fenomeen bekering in de Joods-Hellenistische wereld wordt besproken aan de hand van de Joods-Hellenistische roman 'Joseph en Aseneth', een verhaal over de aartsvader Jozef en bekering van zijn Egyptische vrouw Aseneth naar het Jodendom.Show less
