231,797 research outputs found
Landscape Architecture at TU Delft 1973-2011: Ter gelegenheid afscheid Prof. Dr. Clemens Steenbergen
No full textHet is haast onmogelijk om de werkzame jaren van Prof. Dr. Clemens Steenbergen hier op de TU Delft in het kort samen te vatten. Dit is een persoonlijk boek van collega's, medewerkers en studenten ter gelegenheid van zijn afscheid op 15. December 2011.UrbanismArchitectur
Flow in and around a permeable breakwater
No full textMeasurements in the Waterlab at TU Delft of wave-induced velocities with laser/ doppler and Acoustic Doppler Velocimeter (ADV), just above, before and inside a permeable rubble mound breakwaters. Measurements are done with regular and irregular waves
A 0.12mm<sup>2</sup> Wien-Bridge Temperature Sensor with 0.1°C (3σ) Inaccuracy from -40°C to 180°C
No full text Resistor-based temperature sensors can achieve much higher resolution and energy efficiency than conventional BJT-based sensors [1], but they typically occupy more area (> 0.25 mm 2 ) and have lower operating temperatures (le 125 {circ} {C}) [2]-[4]. This work describes a 0.12mm 2 resistor-based sensor that uses a Wien-bridge (WB) filter to achieve 0.1 {circ} {C} (3 sigma) inaccuracy from - 40 {circ} {C} to 180 {circ} {C}. Compared to a state-of-the-art WB sensor [4], it occupies 6 × less area and achieves comparable relative accuracy over a 76% wider operating range. Session 10.3 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.Electronic InstrumentationMicroelectronic
A ±25A Versatile Shunt-Based Current Sensor with 10kHz Bandwidth and ±0.25% Gain Error from -40°C to 85°C Using 2-Current Calibration
No full textAccurate current sensing is critical in many industrial applications, such as battery management and motor control. Precise shunt-based current sensors have been reported with gain errors of less than 1% over the industrial temperature range (-40°C to 85°C) [1]–[4]. However, since they are intended for coulomb counting, their bandwidth is limited to a few tens of Hz, making them unsuitable for battery impedance or motor-current sensing. This paper presents a current sensor with a wide (10kHz) bandwidth and a tunable temperature compensation scheme (TCS), which allows it to be flexibly used with different types of shunts while maintaining high accuracy. A low-cost room-temperature calibration scheme is proposed to optimize gain flatness over temperature by exploiting the shunt's self-heating at large currents. Over the industrial temperature range and a ±25A current range, it achieves state-of-the-art gain error (±0.25%) with both low-cost PCB and stable metal-alloy shunts.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.Electronic InstrumentationMicroelectronic
Watertovenaars: Delftse ideeën voor nog 200 jaar Rijkswaterstaat
No full textEen bundel artikelen met inspiratie voor Rijkswaterstaat voor de ontwikkeling in de volgende 200 jaar. Watertovenaar of tovenaarsleerling? (K. d'Angremond, P. Huisman en G.I. Schiereek) De oudste deltawerken: dammen en duikers uit het begin van de jaartelling (T. de Ridder) Een erfenis uit de Bataafse periode (W.M. de Jong) Wat eerst: wonen, water, wegen of welvaart? (T.M. de Jong) Een nieuwe rol voor de waterstaatsingenieur (F.M. Sanders) De terugkeer van de stedenbouwkundige discipline (V.J. Meyer Water (P. Huisman, K. d'Angremond en G.J. Schiereek) Dynamische buffers in autosnelwegen (D. Westland en P.H.L. Bovy) Op de automatische piloot door de Randstad? (R. van der Heijden, V. Marchau, E. Molin en K. van Wees) Niet bruggen bouwen, maar zelf brug zijn (B. Enserink, M.P.M. van der Ploeg, WAH. Thissen en G.J. de Vreede) Nederland als vervoersemplacement? (M.P.C. Weijnen, W.A.H. Thissen en E.F. ten Heuvelhof) Immobilisatie van gevaarlijk afval (Ch.F.Hendriks) Dubbel verduurzamen van wegconstructies (A.A.A. Molenaar) Innovatie van de geometrische infrastructuur (P.J.G.Teunissen) Radarhoogtemetingen en de (voorname) rol van Delft (M. Naeije) Een hoog(water)standje (T. Rientjes, C. van den Akker en P. van der Veer) Naar één beslismodel voor de veiligheid (J.K. Vrijling en J. Stoop) De betrouwbaarheid van dijken (A. Verruijt) Windgolven, een fascinerend fenomeen (L.H. Holthuijsen en J.A. Battjes) Mijn droom: het railvaartuig (B. Boon) Een waterfilm in plaats van wielen (A. van Beek) Uren worden minuten (E.A.H. Vollebregt, H. Jansen en M.R.T. Roest) Een kwestie van schuiven (R.Brouwer, A.Hof en J. Schuurmans) Energie door vergisting van slib (M.S.M. letten en M.C.M. van Loosdrecht) Nóg een poldermodel: hoge-sterkte beton (J.C. Walraven) Atollen voor de Noordzeekust (J. Kristinsson) Van maker naar regisseur (H.A.J. de Ridder
Hydraulic performance, wave loading and response of Elastocoast revetments and their foundation - a large scale model study -
No full textELASTOCOAST revetments are highly porous structures made of crushed stones which are durably and elastically bonded by Polyurethane (PU). To improve the understanding of the physical processes involved in the wave-structure-foundation interaction and to develop prediction formulae for both hydraulic performance and wave loading more than 75 large-scale model tests using both regular and irregular waves were performed. Three ELASTOCOAST revetment alternatives with the same slope (1:3) and the same revetment thickness (0.20 m) but with different thicknesses of the underlying filter layer (0.00 m, 0.10 m and 0.20 m for Model Alternatives A, B and C, respectively) were tested. More than 85 measuring devices synchronously connected to two video cameras were used. Prediction formulae are developed for wave reflection, wave run-up and run-down as a function of the surf similarity parameter which illustrate the advantage of ELASTOCOAST revetments as compared to conventional revetments. For instance, more than 25% less wave runup may result on comparison to smooth impermeable revetments. Using a surf similarity-based wave load classification as well as a systematic parametrization in both time and space, prediction formulae are also developed for both impact loads on and just beneath the revetment. These include the peak pressure pmax, its location in relation to still water level zpmax, the spatial pressure distribution and the time related parameters (rise time and total load duration). Prediction formulae for the wave-induced pore pressure in the sand core beneath the revetment are also provided, including the maximum pressure at the upper boundary of the sand layer and its development in deeper layers. Formulae are also proposed for the flexural displacement ä of the ELASTOCOAST revetment, showing that for impact load much smaller displacements would result than for non-impact load and that ä linearly increases with peak pressure pmax for a given revetment thickness. Finally, a stability analysis of Model Alternative A is performed on basis of the results of the measurements and the simultaneously recorded videos. The results illustrate why Model Alternative failed due to local transient soil liquefaction while Model Alternative B tested synchronously under the same wave conditions did not fail.LWI098
Estimation of the Maximum Physically Possible Precipitation in Saxony Using a Mesoscale Atmospheric Model
No full textA series of sensitivity studies have been performed to estimate the impact of presumed global warming on synoptic scale weather events. Within the framework of an epignostic study, mesoscale simulations of the Elbe river flood (August, 2002) employing the COSMO-DE model of the DWD have been carried out. The first set of runs was realised on a model domain size of 201 x 201 grid points with different temperature offsets at constant relative humidity. The results gave no hints on enhanced area accumulated rain sums in a warmed climate. Different temperature offsets at constant relative humidity does not result in significantly changed rain sums with respect to the reference run (climate as is). Increasing the water vapour mixing ratio so far, that the relative humidity increases, the total rain amounts increase, too. The observed rain sums originate from both thermodynamic and hydrodynamic effects (superposition of stratiform, convective and orographic rain contributions). An enhancement of the absolute water vapour mixing ratio at higher temperatures is indeed a necessary, but not a sufficient condition to enhance the rain formation. For example, a displacement of rain-promoting synoptic features might counteract rain formation, when the superposition of processes from different scale is not ensured any longer in a changed atmospheric system.Floodsit
Building Rhythms: Reopening the Workspace with Indoor Localisation
No full textIndoor localisation methods are an essential part for the management of COVID-19 restrictions, social distancing, and the flow of people in the indoor environment. Moving towards an open work space in this scenario requires effective real-time localisation services and tools, along with a comprehensive understanding of the 3D indoor space. This project’s main objective is to analyse how ArcGIS Indoors can be used with location awareness methods to elaborate and develop space management tools for COVID-19 restrictions in order to reopen the workspace for TU Delft Campus. This was accomplished by using six Arduino micro controllers, which were programmed in C++ to scan all available Wi-Fi fingerprints in the east wing of the Faculty of Architecture and the Built Environment of TU Delft and send over the data to an ArcGIS Indoor Information Model (AIIM). The data stored on the AIIM is then accessed using the app on the user’s Android device using REST Application Programming Interface (API) where a kNN based matching algorithm then identifies the location of the user. The results show that the localisation is not consistent for rooms that are directly above each other or share common access points. However, when functioning to locate different tables inside a room, the system proved to uniquely distinguish between the specific tables. As a result, we can conclude that based on the size of the rooms, more Arduino devices should be installed to achieve an ideal accuracy. Finally, recommendations are made for the continuation of this research.GIS Technologi
Briefing: Professor Vincent Nadin’s decade of spatial planning and strategy at TU Delft
No full textDelft University of Technology (TU Delft) is the leading institution in the Netherlands for research and education in urbanism. Planning, design and technology traditionally form the key pillars of ‘Dutch urbanism’. The year 2008 marked the beginning of a new section with a new professor at the TU Delft Faculty of Architecture and the Built Environment: the section of Spatial Planning & Strategy (SPS). With the farewell to SPS professor Vincent Nadin in 2019, a huge source of expertise and inspiration for urbanism has left Delft’s academic community. Under Vincent’s leadership, SPS has strengthened its position and become a centre of excellence on (a) international and European territorial governance and policy-making, including their potential for democracy building, (b) regional design and planning, (c) contemporary methods of spatial planning, spatial planning instruments and spatial planning systems and cultures and (d) territorial evidence and impact assessment.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.Spatial Planning and Strateg
Literatuur studie Scheurgroei Waterbouwasfaltbeton (WAB) bekleding
No full textDeze notitie is gemaakt in het kader van de onderzoeksporen Levensduurmodel en Faalkansbeoordeling. Nagegaan moet worden of het mogelijk is te berekenen hoe lang een bepaalde scheur van onderuit doorgroeit over de dikte van de bekleding tijdens een superstorm. Dit kan informatie geven over de veiligheid die er eventueel in de bekleding zit nadat een grotere scheur van onderuit is ontstaan, bijvoorbeeld tijdens een groot aantal lastherhalingen tijdens de superstorm. De berekeningen zouden ook in verband gebracht moeten worden met de proefresultaten van KOAC-NPC op Fries asfalt [5]. De berekeningen zijn indicatief voor de reststerkte van de asfaltlaag, en zodoende ook voor het belang van de te nemen stappen in de faalkans analyse. Voor zeedijken zou moeten worden uitgegaan van de stormperiode, waarin de dijk door golfaanval mechanisch wordt belast. In het computerprogramma Golfklap wordt meestal gewerkt met omstandigheden voor de parameters: o Temperatuur 5º C o Belastingsfrequentie 10 Hz Waar mogelijk moeten deze omstandigheden worden meegenomen bij de eerste benaderingen.Asfaltbekledinge
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