TY - THES AU - Yang, C.H. PY - 2011 SN - 9789077209509 UR - https://hdl.handle.net/2066/92281 PB - [S.l. : s.n.] TI - Rotationally inelastic scattering of water for astrophysical applications N1 - Radboud Universiteit Nijmegen, 27 juni 2011 N1 - Promotores : Parker, D.H., Meulen, J.J. ter PS - 214 p. ER - TY - THES AU - Donkerbroek, A.J. PY - 2010 SN - 9789090256078 UR - https://hdl.handle.net/2066/82001 PB - [S.l. : s.n.] TI - Combustion in an optical diesel engine studied by light-based diagnostics N1 - Radboud Universiteit Nijmegen, 16 september 2010 PS - VI, 150 p. L1 - https://repository.ubn.ru.nl/bitstream/handle/2066/82001/82001.pdf?sequence=1 ER - TY - THES AU - Manickam, G. PY - 2008 UR - https://hdl.handle.net/2066/53731 PB - Nijmegen : [S.n.] TI - Deposition of diamond films on steel substrates for tribiological applications N1 - the Netherlands, Applied Molecular Physics, 22 september 2008 N1 - Promotor : Meulen, J.J. ter Co-promotores : Schermer, J.J., Enckevort, W.J.P. van, Vlieg, E., Celis, J.P., Buijnsters, J.G. PS - 161 p. L1 - https://repository.ubn.ru.nl/bitstream/handle/2066/53731/53731_depoofdif.pdf?sequence=1 ER - TY - THES AU - Bominaar, J. PY - 2008 SN - 9789090232379 UR - https://hdl.handle.net/2066/66032 PB - Nijmegen : Radboud University TI - Air photolysis and recombination tracking N1 - Radboud Universiteit Nijmegen, 9 september 2008 N1 - Promotor : Meulen, J.J. ter PS - 168 p. L1 - https://repository.ubn.ru.nl/bitstream/handle/2066/66032/66032.pdf?sequence=1 ER - TY - THES AU - Verbiezen, K. PY - 2007 SN - 9090214356 UR - https://hdl.handle.net/2066/30100 AB - Despite the diesel engine's popularity, its emission of high levels of nitric oxide (NO) is problematic. Reduction of pollutant emissions requires a profound understanding of the combustion process and in particular the exact NO formation pathways. Since the latter are not entirely understood, accurate quantitative experiments are necessary to provide new insights and to validate existing combustion models. To date, reliable experimental techniques for in-cylinder NO concentration measurements are scarce. This thesis is dedicated to the development of the laser-induced fluorescence (LIF) technique to a level at which quantitative, in-cylinder concentration measurements of NO can be realised in a heavy-duty diesel engine. A number of laser techniques are investigated, allowing a correction for the severe attenuation that is experienced by both the laser beam and the induced fluorescence in the combustion chamber. Additionally, a spectroscopic model accounting for the pressure and temperature dependence of the fluorescence intensity per molecule is discussed. By applying these two corrections, quantitative in-cylinder NO concentrations are obtained. An important observation is that, during the combustion stroke, significant amounts of NO are observed before the most important NO formation mechanism (the Zeldovich mechanism) can come into play, suggesting that other mechanisms are involved in the early NO formation. Furthermore, measured in-cylinder NO concentration histories are compared with calculated concentrations. Although the agreement between experiment and calculation suggests that the Zeldovich mechanism is a major contributor to the formation of the observed NO, the contribution of other mechanisms early in the combustion cannot be excluded. PB - [S.l. : s.n.] TI - Quantitative NO measurements in a diesel engine N1 - RU Radboud Universiteit Nijmegen, 8 februari 2007 N1 - Promotores : Meulen, J.J. ter, Meerts, W.L. Co-promotor : Dam, N.J. PS - II, 162 p. L1 - https://repository.ubn.ru.nl/bitstream/handle/2066/30100/30100.pdf?sequence=1 ER - TY - THES AU - Moise, A.V. PY - 2007 UR - https://hdl.handle.net/2066/30159 AB - The interaction of the OH radical with atoms and other molecules is relevant for many physical and chemical processes involved in atmospheric, combustion and interstellar chemistry. Various experimental and theoretical studies have revealed information concerning the interaction of the hydroxyl radical with rare gas atoms like He, Ar, Ne and molecules like H2, N2, CH4, CO and CO2. A remarkably good agreement between the theoretical and experimental results was obtained for the OH-Ar inelastic scattering, confirming thus the accuracy of the theoretical models. In this thesis crossed molecular beams experiments are presented in which the scattering of OH molecules by HCl, HBr, HI and Xe is studied. State-to-state cross-sections and steric asymmetries are measured which probe the complete Potential Energy Surfaces (PES) for these atom-diatom or diatom-diatom systems. The experimental techniques employed are: supersonic molecular beam expansions, electrical discharge, electrostatic fields to focus and select the OH molecules in a single internal energy state and to orient them with the H-side or the O-side towards the collision partner, laser induced fluorescence, resonance enhanced multiphoton ionization and velocity map imaging. The rotational inelastic cross sections obtained indicate similarities among the OH-HCl, OH-HBr and OH-HI scattering systems. Generally, the spin-orbit conserving transitions dominate, the -doublet transition exhibits the largest cross-section and the magnitude of the cross-sections decreases with rotational excitation. The measured steric asymmetries reflect the higher anisotropy of the OH-HCl interaction potential. Small steric asymmetries are measured for OH-HBr and OH-HI. A possible correlation between the magnitude and sign of the experimental steric asymmetries with the molecular configurations for the PES minima and the occurrence of the reactions is considered. In order to enrich the knowledge of the OH-rare gases interaction, state-to-state inelastic cross sections and steric asymmetries for the OH molecule scattered by Xe are presented. The experimental results are compared with the theoretical results and with the previously reported results for OH-He and OH-Ar scattering. The major differences observed are discussed aiming at the understanding of the contribution to the interaction of specific type of the intermolecular forces. PB - Nijmegen : [S.n.] TI - Scattering of State-Selected and Oriented Hydroxyl Radicals by Halogen Hydrides and Xenon N1 - RU, Molecular and Laser Physics, 28 augustus 2007 N1 - Promotores : Meulen, J.J. ter, Parker, D.H. PS - 110 p. L1 - https://repository.ubn.ru.nl/bitstream/handle/2066/30159/30159.pdf?sequence=1 ER - TY - THES AU - Bougie, H.J.T. PY - 2007 UR - https://hdl.handle.net/2066/224289 PB - [S.l. : s.n.] TI - On particulate characterization in a heavy-duty Diesel engine by time-resolved laser-induced incandescence N1 - RU Radboud Universiteit Nijmegen, 3 december 2007 N1 - Promotor : Meulen, J.J. ter ER - TY - THES AU - Elenbaas, T. PY - 2006 UR - https://hdl.handle.net/2066/36204 PB - Eindhoven : [S.n.] TI - Writing lines in turbulent air using Air Photolysis And Recombination Tracking N1 - Technical University Eindhoven, N1 - Promotor : Meulen, J.J. ter PS - 158 p. ER - TY - THES AU - Buijnsters, Ivan PY - 2003 SN - 9090167692 UR - https://hdl.handle.net/2066/19264 AB - The main goal of this project was to establish the feasibility of depositing well adhering polycrystalline diamond coatings on steel substrates. It is well known that the growth and adhesion of diamond layers directly onto steels is complicated by the high carbon solubility and the high thermal expansion coefficient of the steel substrate material. Due to the catalytic effect of iron on the formation of graphitic soot, the deposition of adhering and high quality diamond films is hampered as well. In order to solve these problems, interlayer systems, which act as diffusion barriers for both atomic iron and carbon, are required. Using CrN interlayers, continuous and adherent diamond films are obtained on the high-speed steel, whereas only individual crystallites are observed on the stainless steel due to partial delamination of the initially grown films. Ultrathin Si interlayers are efficient diffusion barriers for Fe but not for C during diamond growth onto steel. The third type of interlayer system is produced by means of pack boriding. The resulting boride layers show a very high surface hardness, which gradually decreases on approaching the bulk. The presence of FeB at the surface results in very high thermal stresses and delamination of the diamond films on both types of steel. If only a Fe2B phase is present, continuous diamond films with low residual stresses are grown on both borided stainless and tool steel. A direct comparison made with the strongly adhering diamond layers on the molybdenum substrates indicates only a slightly inferior adhesion for the diamond coated stainless steel with the CrN interlayer. Using electrochemical polarization studies, the corrosion resistance of blank tool steel in sodium chloride solutions is found to be very low, but is significantly increased by the deposition of protective diamond layers. However, the effect of the applied interlayer systems on the shift of the corrosion potential is very strong PB - [S.l. : s.n.] TI - Hot-filament chemical vapour deposition of diamond onto steel PS - X, 164 p. L1 - https://repository.ubn.ru.nl/bitstream/handle/2066/19264/19264_hotfchvad.pdf?sequence=1 ER - TY - THES AU - Klein-Douwel, R.J.H. PY - 1997 SN - 9090110747 UR - https://hdl.handle.net/2066/91237 PB - [S.l. : s.n.] TI - Laser diagnostics in a diamond growing flame N1 - Radboud Universiteit Nijmegen, 26 november 1997 Promotor : J. ter Meulen PS - 120 p. L1 - https://repository.ubn.ru.nl/bitstream/handle/2066/91237/mmubn000001_254516521.pdf?sequence=3 ER -