103 research outputs found
Kostenbewust beheer en onderhoud van kunstwerken: probleem inventarisatie en onderzoeksvoorstel: studierapport
No full textImproving safety climate and behavior through a multifaceted intervention: Results from a field experiment
No full textIntermodaal weg/railvervoer: Een labyrint van bestuurlijke belemmeringen
No full textOTB Research Institute for the Built Environmen
Goederentransportknooppunten: Typologie en dynamiek. Deel I
No full textDeel I van de studie Knooppunten en netwerken van goederenvervoer; typologie, dynamiek en modaliteit.OTB Research Institute for the Built Environmen
Numerical Study of Wetting of a 2D Cylinder by an Impacting Jet
No full textIn many processes, for example trickle-bed reactors, it is important to completely wet small spheres, or particles. (Baussaron, et al., 2007) Ideally, a small stream of liquid on such a particle would create a film around the particle, completely wetting it. It is therefore interesting to investigate which factors influence the formation of this film and to what effect. To this end, a simpler 2D case is investigated in this project: a small cylinder.Transport PhenomenaChemical EngineeringApplied Science
Dune erosion management: a cost benefit analysis
No full textA method is presented and illustrated to establish economically justifiable coastal protection measures to reduce storm damage. This method can be used in the initial design stage of a project and gives the opportunity to handle uncertainty of the various types of information. The method is based on a probabilistic description of the rate of dune erosion. Economic loss caused by this erosion is therefore also a stochastic parameter. Costs to reduce these potential losses are then compared with the potential damage. The method is applied to an example case in which buildings are threatened by dune erosion while sand replenishment schemes are considered to reduce this threat
Micro Particle Image Velocimetry measurements in a capillary
No full textKramers Laboratorium voor Fysische TechnologieApplied Science
Formation and Transport of Bubbles in Microfluidic Systems
No full textPrecise manipulation of minute volumes of fluids is at the heart of microfluidics and opens up an exciting route to miniaturize processes in the areas of chemistry, biology and medicine. An attractive way to transport small fluid samples through the channels of microfluidic devices is by enclosing these samples inside containers in the form of microbubbles or microdroplets. The work described in this thesis is motivated by the need to reliably form such microbubbles and microdroplets and robustly transport them through networks of microchannels at high throughput. One of the central questions addressed in this thesis is how bubbles form at T-junctions under conditions typical to bubble-based microfluidic systems. The basic question how large bubbles grow is resolved by studying the fundamentals of bubble formation and pinch-off using experimental techniques, such as micro Particle Image Velocimetry. Another key question addressed in this thesis is how bubbles are transported in confined geometries. We hereby considered transport of bubbles through simple microchannel networks as found in for instance micro reactors and laboratories-on-chips, as well as through more complex microchannel networks comparable to for instance the pore structure in micro packed beds or oil reservoirs.Multi-Scale Physics / Chemical EngineeringApplied Science
All-aqueous compartmentalized structures by microfluidics
No full textChemical EngineeringApplied Science
Quaternion PCA and sparse PCA for shape variability
No full textPrincipal component analysis (PCA) is commonly used in the fields of computer graphics and geometry processing for constructing subspaces that represent the variability present in a dataset. Examples of such datasets are configurations of a non-rigid object, poses of a deformable character or snapshots from a simulation. By applying PCA to the dataset, one can generate a lower-dimensional space in which the data samples can be approximated well. Similar to PCA, one can also apply a sparse PCA technique to the geometric data. These methods aim to find components that do not only describe the deformations present in the data well, but are also sparse and localized.One of the problems related to PCA and sparse PCA is that they do not take the correlation between the x, y and z coordinates of each vertex into account when constructing the subspace. Furthermore, the methods are not invariant to rigid motion (rotations and translations) of the data samples, which means that rigid registration has to often be applied to the samples as a preprocessing step. Ideally, we would like to construct a subspace that is invariant to these rigid motions.This project investigates whether quaternions can be used to solve these problems. By describing each vertex as a pure quaternion, we show how quaternion PCA can be applied to geometric data and introduce a quaternion method of snapshots for improved computational efficiency. Additionally, we derive multiple quaternion sparse PCA techniques, which are inspired by the Sparse Localized Deformation Components (SPLOCS) method. Experimental results show that the quaternion PCA and sparse PCA methods are able to describe a richer space of deformations using fewer components. Furthermore, we show that quaternion PCA leads to improved rigid motion invariance.Computer Scienc
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