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Atomistic simulation of ultra-short pulsed laser ablation of metals with single and double pulses Universiteit Antwerpen
The demand for higher throughput in the processing of materials with ultra-short pulsed lasers has motivated studies on the use of double pulses (DP). It has been observed in such studies that at relatively high time delays between the two pulses, the ablated volume is lower than that for a single pulse (SP). This has been attributed to the shielding of the second pulse and the re-deposition of the material removed by the first pulse. The ...
The target material influence on the current pulse during high power pulsed magnetron sputtering Universiteit Gent
The current-time characteristic during high power pulsed magnetron sputtering is measured under identical conditions for seventeen different target materials. Based on physical processes such as gas rarefaction, ion-induced electron emission, and electron impact ionization, two test parameters were derived that significantly correlate with specific features of the current-time characteristic: (i) the peak current is correlated to the momentum ...
Nonlinear pulse shaping in pulsed quantum dot lasers Vrije Universiteit Brussel
In this work we study the ffect of slow passage in the pulse-pumped dual-state-lasing quantum dot laser. During pulsed operation close to the excited-state threshold, the output pulse becomes unstable. After the rise stage, the output power sharply drops out. It is followd by instabilities that may appear after a significant delay.
Pulse trawling : the impact of pulsed direct current on early life stages of sole Solea solea Universiteit Gent
Inter-day, inter-observer and intra-observer variability of arterial pulse wave velocity measurements using pulsed wave Doppler in healthy horses Universiteit Gent
Characterization of positive and negative pulses from a commercial RC based pulse generator in micro-EDM milling KU Leuven
Resistor-capacitor (RC) based pulse generators are commonly used in micro-EDM applications thanks to their ability to provide very low energy pulses to remove volume of material per spark. Tool wear however can still be significant, crucially affecting the machining accuracy. In this work, the characteristics of the discharging pulses with respect to a given set of machining conditions and pulse generator are studied. This research will enable ...
A unified mechanism for the water hammer pulse and pulsus bisferiens in severe aortic regurgitation: Insights from wave intensity analysis Universiteit Gent
Reaction mechanisms of Sn-complex-side-chain polymer used for extreme ultraviolet lithography, studied by electron pulse radiolysis and & gamma;-radiolysis Interuniversitair Micro-Electronica Centrum vzw KU Leuven
The development of highly sensitive resists containing tin, which has a large EUV absorption cross section, has recently attracted considerable attention in EUV lithography. The effective utilization of secondary electrons is required for the development of high-performance resists. It is important to design resist materials on the basis of the mechanism of radiation chemical reactions. In this study, the radiation-induced reactions of ...
A model approach to estimate the hydrodynamic drag and sediment mobilisation applied to tickler chain beam trawls and pulse beam trawls used in the North Sea fishery for sole. Instituut voor Landbouw-, Visserij- en Voedingsonderzoek
Bottom trawls impact the seafloor and benthic ecosystem. To estimate the trawling impact, information is required about the dimensions of the gear that determine their footprint, sediment penetration depth and hydrodynamic drag that determines the amount of sediment mobilised in the wake of the trawl. Here we present the dimension of gear components of the different beam trawls used in the North Sea flatfish fishery including the traditional ...