687 research outputs found
Manual Hydraulic Structures
No full textThis manual is the result of group work and origins in Dutch lecture notes that have been used since long time. Amongst the employees of the Hydraulic Engineering Department that contributed to this work are dr.ir. S. van Baars, ir.K.G.Bezuijen, ir.G.P.Bourguignon, prof.ir.A.Glerum, dr.ir.P.A.Kolkman, ir. H.K.T. Kuijper, ir. H.G. Voortman and prof.drs.ir. J.K. Vrijling. The latest years, this manual has been clarified, revised and expanded by ir. W.F. Molenaar and ing. M.Z. Voorendt. We have received much feedback from students and got good input from our student-assistants, which is highly appreciated and has been taken taken into account for this new edition. In the 2016 edition, some minor corrections were made throughout the Manual, most noticeably the equation for the spring stiffness of a combined system in Section 29.2. Section 11.1 has been updated with more generic weir discharge equations. Furthermore, serviceability requirements have been added to the chapter on wave-overtopping (Chapter 17) and the Blum theory for laterally loaded piles has been better explained in Chapter 44. The largest change is the addition of Chapter 49, about the determination of the height of flood defences
Design, Performance and Control of the CDF Run II Data Acquisition System 2004 IEEE Nuclear Science Symposium
No full textAn Investigation of Consumer Loyalty to Stores
No full textTitle: An Investigation of Consumer Loyalty to Stores, Author: Gordon W.F. Parsons, Location: ThodeIn recent years there has been growing commercial and academic interest into the question of consumer purchasing behaviour at stores, and a great deal of research has been done on this topic using aggregate consumer data. The main study objective of this investigation was to ascertain the nature of consumer store loyalty across different product
fields, consumer characteristics, and shopping trip characteristics, based on an analysis of consumer purchasing sequences carried out by the 'run test'. The analysis of data extracted from the Cardiff Consumer Panel, a data set which includes continuous records of the grocery shopping
behaviour using the this approach revealed a number observations on the nature of consumer purchasing behaviour, including a link between car ownership and store loyalty.ThesisBachelor of Arts (BA
De invloed van de atmosfeer en de warmtebehandeling bij het electrisch lasschen
No full textMechanical, Maritime and Materials Engineerin
Fluorinated building blocks for next-generation polymer electrolyte membrane fuel cells
No full textThe purpose of this thesis is to design, create and study basic building blocks for the construction of self-assembled nanostructured electrodes and membranes for PEMFC. The research described deals with the synthesis of polymerizable fluorosurfactant (1) and its non-polymerizable analogue (2) and the study of their self-assembly properties. Similarly, the (co)polymerization behavior of 1 and the polymer properties are described. The design of the polymerizable fluorosurfactant, 1 and the synthetic routes to obtain the desired functionalities and molecules are discussed in Chapter 1. The reaction pathways to create –SO3¯ as well as styryl groups are described. The syntheses of compounds 1 and 2 are described in Chapter 3. The key reactions viz. the copper mediated cross-coupling reactions to attach fluorocarbon molecules to aromatic moieties and the Wittig reactions to obtain styryl functionalities are described. The micellization properties of 1 and 2 are deliberated in Chapter 4. Unlike, several fluorinated sulfonic acid salt surfactants, both surfactants were soluble in water at room temperature. This is due to their hybrid character and the presence of bulky aromatic moieties in the surfactant tails. Both compounds 1 and 2 display comparable cmc values ~30 mM, and form spherical shaped micelles. The Gibbs energy of micellization of 1 and 2 are in the range of -24 to -26 kJ mol-1. The micelles were characterized by low aggregation numbers, in the range of 25 to 35. Entropy driven micelle formation and a U-shaped relation was observed between the Gibbs energy of micellization and experiment temperatures were observed. The LLC phase behavior of 2-water mixtures is described in Chapter 5 and two lyotropic phases in the range of 63 to 84 wt% 2 were identified and investigated. An unprecedented supramolecular columnar (Cs) phase made up by self-assembly of “Leek” shaped aggregates was observed in the concentration regime between 63 and 70 wt% 2, and a lamellar (L?) phase was observed from 70 to 84 wt% 2. The “Leeks” were shown to be formed by wrapping up of the 2-water bilayers. An interdigitated and/or tilted assembly of 2 molecules was suggested for both LLC phases based on SAXS data analysis. Homo and copolymers of compound 1 with model the perfluorinated comonomer, 3 or styrene were prepared by free radical method, and are discussed in Chapter 6. The strong incompatability of ionic groups and fluorocarbon moieties of poly-1 severely hampered the molecular weight determination by GPC. Homopolymer of 3 is insoluble in most of the polar as well as nonpolar solvents. 19F NMR experiments revealed that there are inhomogeneities within the copolymer samples synthesized from 1 and 3 because of the large compositional drifts with respect to the comonomer feed ratios occurred during the polymerization. Thermal stabilities of all polymers were slightly better compared to the thermal stability of polystyrene. Cryo-TEM P1-water solution revealed the formation of elongated worm-like micelles with ~5 nm diameter and length of up to 400 nm. These micelles were suggested to be formed by the lateral self- assembly of 2-3 extended polymer chains of P1.Chemical EngineeringApplied Science
Extraction and Visualization of Dimensions from a Geometric Model on the basis of its Medial Axis
No full textComputer Graphics and CAD/CAM GroupElectrical Engineering, Mathematics and Computer Scienc
Direct display algorithms for solid modelling
No full textElectrical Engineering, Mathematics and Computer Scienc
Neural pattern classifying systems: Theory and experiments with trainable pattern classifiers
No full textApplied Science
Hydraulic Structures: Locks
No full textThese lecture notes on locks are part of the study material belonging to the course 'Hydraulic Structures 1' (code CT3330), part of the Bachelor of Science and the Master of Science, the Hydraulic Engineering track, for civil engineering students at Delft University of Technology. Many of the principles and engineering techniques treated in the BSc curriculum have to be applied when designing a lock. Everything has to be used, from construction mechanics to fluid and soil mechanics, and anything in between, or vice versa. A most important design aspect will be added: construction. Unfortunately, construction differs considerably from site to site, hence this important matter surely cannot be discussed in all its details and varieties, but an effort to show the most relevant items to be taken into account will be made. It should be emphasised that the designer has the opportunity, maybe the obligation, to combine all the imaginative powers, common sense and engineering judgement, to deal with the present day and future problems related to the project at hand
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