1,367 research outputs found
Investigating sailing styles and boat set-up on the performance of a hydrofoiling Moth dinghy
No full textThe adoption of hydrofoils in the International Moth class of dinghy has posed new challenges to sailors both in terms of the set-up of the boat and hydrofoils, and their sailing techniques and styles. The experience of sailors in the class indicates that the height above the water surface at which the boat is flown (ride height) and the amount of windward heel (heel angle) are critical factors affecting performance, particularly in upwind sailing. The fore-aft position of the helm affects the stability of the craft and, in conjunction with the aft foil settings, alters the pitch orientation of the craft and offers potential for significant gains in performance. A four degree of freedom velocity prediction programme (VPP) with the capability to investigate these factors is presented and used to demonstrate how the fore-aft position of the helm and the aft foil may be used in conjunction to maximise speed
Investigation of the effects of hydrofoil set-up on the performance of an international moth dinghy using a dynamic VPP
No full textThe International Moth dinghy is a 3.355m long single handed, una-rigged monohull dinghy. The class rules allow the use of hydrofoil that in certain wind conditions can significantly reduce resistance. A new velocity prediction program (VPP) has been developed to evaluate the impact of hydrofoil design and set-up on the performance of a Moth dinghy by simulating racing on a windward - leeward course. The VPP generates polar diagrams indicating the speed of the craft in a range of true wind strengths and angles. Sail force and windage are modelled using aerofoil theory. The drag model includes hull skin friction and residuary resistance, profile and induced drag for every foil, wavemaking drag of the lifting foils and spray drag of the surface piercing foils. Using an iterative process the VPP determines the boat speed that balances resistive forces with drive force, heeling moment and righting moment and vertical lift forces with weight. A series of case studies demonstrate the use of the VPP by examining the effects of changing the span of the forward foil, adding end plates, and using different foil geometries on performance
Bouwlogistieke innovaties weerbarstig te implementeren
No full textToelevering van bouwmaterialen aan bouwprojecten is complex en verregaande gesegregeerd. De bouwsector staat voor een kans te innoveren op het vlak van de bouwlogistiek. In het verleden is ervaring opgedaan met ‘best-practices’ die voldoende kansen bieden de noodzakelijk innovatie door te voeren. Via proeftuinen wordt in het TKI-project ‘4C in Bouwlogistiek’ gewerkt aan het implementeren van de ‘best-practices’: bouwlogistiek hubs, bouwtickets, vandaag voor morgen, opstelstrips en mobiele voorraadcontainers. Ervaring leert dat cultuurverschillen tussen bouwkundigen en logistici, en gebrek aan meten en vastleggen van gegevens de implementatie bemoeilijken. Echte innovatie gaat mogelijk komen van bedrijven die logistiek geheel anders gaan doen. Voorbeelden van concepten die voor innovatie in bouwlogistiek kunnen zorgen zijn te vinden bij: IKEA, Toyota, Zara, Uber. Ook 3Dprinting gaat de bouwlogistiek sterk beïnvloeden.Engineering, Systems and ServicesTechnology, Policy and Managemen
Modelling Gaia: towards an Actor-Network modelling framework in archaeology
No full textGreen Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Water Resource
Análisis del isótopo de oxígeno del Entierro 2.A, Pirámide de la Luna, Teotihuacan. 29. Arqueología
No full textSpence, M.W. y Denise To, “Los restos humanos de la primera
temporada de excavaciones en la Pirámide
de la Luna”, México, Informe al INAH, 2000,
mecanoescrito.White, C.D., et al., “Oxygen isotopes and the identification of
geographical origins: the Valley of Oaxaca versus
the Valley of México”, Journal of Archaeological
Science, núm. 25, 1998, pp. 643-655.White, C.D., M.W. Spence, Fred J. Longstaffe,
E. Rattray y K.R. Law
“Un análisis del isótopo oxígeno en los entierros
del Barrio de los Comerciantes”, ponencia
para La Segunda Mesa Redonda de Teotihuacan,
septiembre 2002.Ubelaker, D., Human skeletal remains: excavation, analysis and
interpretation, Chicago, Aldine Publishing, 1978
Special Order no. 177 (2 August 1864)
No full textLeave of absence (2 days) granted to M.W. Boyd to bringing absentees into camphttps://egrove.olemiss.edu/ciwar_milrec/1002/thumbnail.jp
Conceptualizing and implementing an agent-based model of an irrigation system
No full textGreen Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Water Resource
DARE-TU Project: Co-creation of Affordable and Clean Pumped Irrigation for Smallholders
No full textAccepted Author ManuscriptWater ResourcesDesign for Sustainabilit
Letter to the Editor
No full textLetter - A handwritten letter to the Editor of the Alberta Report written by Ruth Gorman under the pseudonym, M.W. Eagle (5 pages)WC
Discussion of “Perceptual models of uncertainty for socio-hydrological systems: a flood risk change example”<sup> <sup>*</sup> </sup>
No full textDealing with uncertainty is key in socio-hydrological analysis. As such, thinking through what uncertainties mean for whom and when is key. This discussion contribution introduces three issues related to defining uncertainties. The first issue deals with the problem of defining uncertainty as a given external reality. The second issue deals with who decides about relevant uncertainties. The third issue deals with the issue whether coupled human-hydrological systems can be seen as existing on their own. Finally, the text provides two examples of hydrological research that try to be explicit about our dealing with multiple (interpretations of) realities.Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Water Resource
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