511 research outputs found
De circulaire stad van morgen: aandachtspunten bij het droombeeld van de circulaire economie
No full textCirculaire economie moet dé pijler worden van een bloeiend en veerkrachtig Vlaanderen. De omslag naar een circulaire economie is sinds enkele jaren een prioriteit van de Vlaamse regering. De aandacht neemt niet af. De Europese, gewestelijke en federale politieke agenda's zullen de komende jaren dankbaar gebruik blijven maken van het adjectief 'circulair' om nieuw beleid voor te stellen, of bestaand beleid te updaten.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
Feasibility of Concrete Shells using Flexible Mould Prefabricated Concrete Elements
No full textShell structures appear quite often in our daily life. From aircraft fuselages to storage silos and boat hulls, these structures are employed for their structural efficiency and the aesthetics they provide. They are characterised by a small thickness in comparison to their other dimensions and by curvature in their unstressed state. Despite their structural efficiency transferring loads in their plane, thin concrete shells are not employed quite often. The traditional construction method is a labour intensive process which includes the fabrication of a formwork system, usually made out of plywood, on which concrete is cast. The necessary reinforcement in the form of bars although it is quickly placed, it has the drawback of requiring frequent joints and overlapping. Its bending and assembling is also considered difficult for curved shapes like shells. As it can be seen, great costs emerge from this process and this was a trigger factor for the formation of the research question. A different approach for the construction of shells employs prefabricated elements which are connected on site and create the complete thickness of the concrete shell. Although high construction speed and high quality are achieved with this method, significant reduction of costs is still not feasible, as the formwork is very expensive and re-use of it, is only occasionally possible. However, an adjustable mould can produce elements of different dimensions, shape and curvature, decreasing substantially the formwork costs which comprise large part of the total shell construction costs. The flexible mould method and the principle of deformation after casting that were introduced by Prof. R.H. Schipper find application in this project. This project aims to answer whether it is possible to construct a concrete shell using the flexible mould prefabricated elements, without putting aat risk the stability of the structure. A comparison between the structural feasibility of a monolithic shell and the one of a segmented prefabricated shell is the method that will be utilised to answer the research question.Civil Engineering | Building Engineerin
Assessment of effects of chemical contaminants in dredged material on marine ecosystems and human health
No full textOm te voorkomen dat scheepvaartroutes dichtslibben moeten waterwegen en havens in deltagebieden regelmatig worden gebaggerd. Wereldwijd worden op jaarbasis honderden miljoenen tonnen baggerspecie en sediment verwijderd. Nederland verspreidt jaarlijks meer dan 25 miljoen kubieke meter gebaggerd sediment in de Noordzee. Hierbij is het van belang te kunnen bepalen wat de risico's zijn voor het ecosysteem. Het in sediment identificeren van chemische stoffen die een potentieel risico vormen voor het ecosysteem of voor de menselijke gezondheid is dan ook het onderwerp van veel studies. Dit proefschrift onderzoekt de toepasbaarheid van in vitro, in vivo bioassays en bio-indicatoren als mogelijke beoordelingsinstrument voor het vaststellen van de schadelijke effecten op zeeorganismen van complexe chemische verbindingen in sedimen
Innovative Ways of Dealing with Existing Problems: How to reliably Assess the Cause of Damage of Masonry Structures in an Area with Man-induced Earthquakes?
No full textGroningen, a province in the northern part of the Netherlands, suffers from earthquakes because of gas drilling. The residential building stock in Groningen was not designed for these loads. Over the years a lot of smaller and larger damage has developed, possibly - but not necessarily - caused by the effects of gas drilling. Delft University of Technology was asked by the Dutch government to come up with a method to reliably assess the cause of damage of masonry structures in Groningen. This paper discusses the developed approach for reliably assessing the causes of failure of masonry structures in earthquake-prone areas and the way innovative monitoring techniques were applied.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.Applied Mechanic
Efficient material use through smart flexible formwork method
No full textConcrete is an excellent material for application in free-form architecture as a result of its initial fluid state. Double-curved building shapes have been realized in various fibre-reinforced mixtures, using advanced CNC-milled formwork systems. However, a substantial reduction of material use is still possible on two ends: by using a flexible formwork very thin and structurally efficient elements can be manufactured, reinforced with fibres or textiles. Moreover, the reusability of the flexible formwork considerably limits the waste material that was always remaining after the use of milled formwork systems. This paper discusses experiments with both formwork and mixtures in a PhD-study of the first author, demonstrating the ecological potential of this innovative production method.Structural EngineeringCivil Engineering and Geoscience
Low-Budget Earthquake Resistant Housing Design in Rural Nepal
No full textCivil Engineering and GeosciencesCIE4061-09 - Multidisciplinary Projec
The impact of STI test results and face-to-face consultations on subsequent behavior and psychological characteristics.
No full textAcknowledgments The authors would like to thank Maarten Schipper at the Biostatistics Department at the National Institute for Public Health and the Environment, who provided assistance with the statistical analyses. Furthermore, the authors are grateful to the staff at the SHC of Amsterdam, Kennemerland, Hollands Noorden, Twente (especially Karin Westra, Anne de Vries, and Karlijn Kampman) who were involved in the recruitment and data collection of participants at baseline and to Marlous Ratten and Klazien Visser from Soapoli-online, who coordinated the laboratory testing of the home-based test kits at six-month follow-up. The authors would also like to thank the staff at the STI department at the National Institute for Public Health and the Environment, especially Birgit van Benthem.Peer reviewe
Implicit Knowledge in Unawareness Structures
No full textAwareness structures by Fagin and Halpern (1988) (FH) feature a syntactic
awareness correspondence and accessibility relations modeling implicit
knowledge. They are a flexible model of unawareness, and best interpreted from
a outside modeler's perspective. Unawareness structures by Heifetz, Meier, and
Schipper (2006, 2008) (HMS) model awareness by a lattice of state spaces and
explicit knowledge via possibility correspondences. Sublattices thereof can be
interpreted as subjective views of agents. Open questions include (1) how
implicit knowledge can be defined in HMS structures, and (2) in which way FH
structures can be extended to model the agents' subjective views. In this
paper, we address (1) by defining implicit knowledge such that it is consistent
with explicit knowledge in HMS models. We also introduce a variant of HMS
models that instead of explicit knowledge, takes implicit knowledge and
awareness as primitives. Further, we address (2) by introducing a category of
FH models that are modally equivalent relative to sublanguages and can be
interpreted as agents' subjective views depending on their awareness. These
constructions allow us to show an equivalence between HMS and FH models. As a
corollary, we obtain soundness and completeness of HMS models with respect to
the Logic of Propositional Awareness, based on a language featuring both
implicit and explicit knowledge.Comment: 46 pages. arXiv admin note: substantial text overlap with
arXiv:2307.05041 author note: This is the full version of the
arXiv:2307.0504
Bundeling van zonlicht door gekromde gevels: Een concreet probleemgeval onderzocht met parametrische tools, simulatie en controlemetingen
No full textWat te doen als je prachtige gekromde glazen gevel onverwacht als vergrootglas blijkt te werken? Het fenomeen, dat al enigszins bekend was van de beruchte “Walkie Talkie” in Londen, is al eens eerder beschreven in Bouwfysica in 2018 [1]. Helaas kon dat artikel niet voorkomen dat ook in Nederland dit probleem vorig najaar plotseling optrad bij een nieuw gebouw dat op het punt stond opgeleverd te worden. Smeltende auto-onderdelen op het ondergelegen parkeerterrein, mogelijk gevaar voor bezoekers en een ongeruste opdrachtgever waren het resultaat. Parametrische tools en software voor simulatie van bezonning hielpen het ontwerpteam en de opdrachtgever om samen te zoeken naar de meest geschikte oplossing.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.Applied MechanicsEnvironmental & Climate Desig
The El Palmar Area: A study on hydrodynamic and sedimentation characteristics
No full textThe purpose of this study is to identify the hydrodynamic effects of the dredging works and stationary making of the El Palmar island in 2015. The most critical parameters include wet/drys season, sediment characteristics and tides. This study makes use of a model constructed in DELFT3D. The model is used to show both the hydrodynamic and sedimentation characteristics for several scenario’s. The results from this study can be used as information source for future dredging works and flooding prevention in the area of Guayaquil.Civil Engineering and GeosciencesMultidisciplinary Project (CIE4061-09
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