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Sun, Junzi (author), Vû, Huy (author), Ellerbroek, Joost (author), Hoekstra, J.M. (author)Wind and temperature data are important parameters in aircraft performance studies. The lack of accurate measurements of these parameters forces researchers to rely on numerical weather prediction models, which are often filtered for a larger area with decreased local accuracy. Aircraft, however, also transmit information related to weather...journal article 2018
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Gentili, M. (author), Hoekstra, J.S.C.M. (author)According to basic economics, when vacancy rates rise, house prices should decrease and vice versa, responding to supply and demand mechanisms. However, previous studies have observed that, before the economic crisis, this was not the case in Spain and Malta. It has been questioned whether this paradox is a Mediterranean phenomenon or simply the...journal article 2018
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Bekkering, H.C. (author), Hoekstra, M.J. (author), Rooij, R.M. (author), Wagenaar, C. (author), Zeinstra, J.S. (author)As part of the renewal in 2013/2014 of the bachelor education curriculum in the Faculty of Architecture and the Built Environment, Delft University of Technology, a new study programme was prepared on the Fundamentals (in Dutch: Grondslagen) of spatial design. The teaching approach, visually presented by some examples and explained in this...journal article 2018
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Deng, W. (author), Hoekstra, J.S.C.M. (author), Elsinga, M.G. (author)After three decades of housing reform in China, housing assets constitute a sizable share of family wealth but are distributed unevenly, as registered homeowners are predominantly male. This is partly because males generally have higher incomes than females and can therefore contribute more to the financing, but also because males receive more...journal article 2018
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Marais, Lochner (author), Hoekstra, J.S.C.M. (author), Napier, Mark (author), Cloete, Jan (author), Lenka, Molefi (author)Under apartheid, black African households could not own land or homes in most major urban centres in South Africa. This limited residential mobility and locked many households into state rental accommodation in townships. Homeownership for all South Africans was restored in the mid-1980 s and the Group Areas Act was repealed in 1991.<br/...journal article 2018
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Deng, W. (author), Hoekstra, J.S.C.M. (author), Elsinga, M.G. (author)This paper explains the development of the urban housing system in China from 1949 to 2011 with an emphasis on the factors driving housing inequality in each policy period. We argue that the logic underpinning the housing policy had shifted from socialist redistribution to the stimulation of growth in the process of market economy reform and has...journal article 2017
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Pietra, F. (author), Kirkwood, N.R.M. (author), De Trizio, L. (author), Hoekstra, Anne W. (author), Kleibergen, Lennart (author), Renaud, N. (author), Koole, Rolf (author), Baesjou, Patrick J. (author), Manna, L. (author), Houtepen, A.J. (author)In this work, we demonstrate that a preferential Ga-for-Zn cation exchange is responsible for the increase in photoluminescence that is observed when gallium oleate is added to InZnP alloy QDs. By exposing InZnP QDs with varying Zn/In ratios to gallium oleate and monitoring their optical properties, composition, and size, we conclude that Ga3+...journal article 2017
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Sun, Junzi (author), Ellerbroek, Joost (author), Hoekstra, J.M. (author)AUTOMATIC dependent surveillance–broadcast (ADS-B) [1,2] is widely implemented in modern commercial aircraft and will become mandatory equipment in 2020. Flight state information such as position, velocity, and vertical rate are broadcast by tens of thousands of aircraft around the world constantly using onboard ADS-B transponders. These data...journal article 2017
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Hoekstra, M. (author), de Weerd, F.A. (author), Kleerebezem, R. (author), van Loosdrecht, Mark C.M. (author)The implementation of autotrophic nitrogen removal in the mainstream of a municipal wastewater treatment plant is currently pursued. Among the crucial unknown factors are the kinetic properties of anaerobic ammonium oxidising (anammox) bacteria at low temperatures. In this study we investigated the adaptation of a fast-growing anammox culture...journal article 2017
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Analysis of Airspace Structure and Capacity for Decentralized Separation Using Fast-Time SimulationsSunil, E. (author), Ellerbroek, Joost (author), Hoekstra, J.M. (author), Arntzen, M. (author)The work that is presented in this paper is part of an ongoing study on the relationship between airspace structure and capacity. The present paper investigates the degree of structuring needed to maximize capacity for decentralized en-routeairspace. To this end, four decentralized en-route airspace concepts,...journal article 2017
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Hoekstra, J.S.C.M. (author)The Dutch social rental sector often serves as an example for other countries as a result of its large share and good quality housing. However, many things have changed in the sector in recent years. After 2011, the central government has regained its control over the housing associations. This was needed after the unacceptable amount of...journal article 2017
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Jansen, S.J.T. (author), Hoekstra, J.S.C.M. (author), Boumeester, H.J.F.M. (author)The extraction of natural gas in the north of The Netherlands has led to soil subsidence and the occurrence of earthquakes. Residents worry about the safety of their families and the saleability of their dwelling and might want to move. The goal is to examine whether the earthquakes are related to the intention to move. A survey among...journal article 2017
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- Haffner, M.E.A. (author), Hoekstra, J.S.C.M. (author), Tang, C. (author), Oxley, M (author) journal article 2016
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Pietra, F. (author), De Trizio, L. (author), Hoekstra, Anne W. (author), Renaud, N. (author), Prato, Mirko (author), Grozema, F.C. (author), Baesjou, Patrick J. (author), Koole, Rolf (author), Manna, L. (author), Houtepen, A.J. (author)Colloidal quantum dots (QDs) show great promise as LED phosphors due to their tunable narrow-band emission and ability to produce high-quality white light. Currently, the most suitable QDs for lighting applications are based on cadmium, which presents a toxicity problem for consumer applications. The most promising cadmium-free candidate QDs...journal article 2016
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Dol, C.P. (author), Mazo, Estrella Cruz (author), Lambea Llop, N. (author), Hoekstra, J.S.C.M. (author), Cano Fuentes, G.I. (author), Etxarri, Aitziber Etxezarreta (author)The Spanish home ownership sector has been hit hard by the economic crisis. Repossessions stand at around half a million in the period from 2008 to 2014. This article investigates how the authorities, both at the level of the Spanish state and of the autonomous communities (regions), have responded to this problem. We investigated whether...journal article 2016
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Hoekstra, J.S.C.M. (author), Marais, L (author)Subsidised housing often creates a segmented housing market, with some home owners falling into a gap between the subsidised and non-subsidised types. This gap particularly affects middle-income buyers, whose income may be too high to qualify for subsidy but too low to buy a non-subsidised house. Western Europe has policies and affordable...journal article 2016
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Nijhuis, S. (author), Stolk, E.H. (author), Hoekstra, M.J. (author)The Department of Urbanism at the Faculty of Architecture and Built Environment at the Delft University of Technology has a long tradition in educating generations of internationally oriented designers, planners and researchers in urbanism. Here the domain of urbanism is defined as an interdisciplinary approach that engages in real-world...journal article 2016
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Poot, Vincent (author), Hoekstra, M. (author), Geleijnse, M.A.A. (author), van Loosdrecht, Mark C.M. (author), Pérez, Julio (author)Partial nitritation was stably achieved in a bench-scale airlift reactor (1.5L) containing granular sludge. Continuous operation at 20 °C treating low-strength synthetic wastewater (50 mg N-NH<sub>4</sub> <sup>+</sup>/L and no COD) achieved nitrogen loading rates of 0.8 g N-NH<sub>4</sub> <sup>+</sup>/(L·d) during partial nitritation. The...journal article 2016
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Jenie, Y.I. (author), van Kampen, E. (author), de Visser, C.C. (author), Ellerbroek, Joost (author), Hoekstra, J.M. (author)This paper proposes a novel avoidance method called the three-dimensional velocity obstacle method. The method is designed for unmanned aerial vehicle applications, in particular to autonomously handle uncoordinated multiple encounters in an integrated airspace, by exploiting the limited space in a three-dimensional manner. The method is a three...journal article 2016
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Jenie, Y.I. (author), van Kampen, E. (author), Ellerbroek, Joost (author), Hoekstra, J.M. (author)This paper proposes a taxonomy of Conflict Detection and Resolution (CD&R) approaches for Unmanned Aerial Vehicles (UAV) operation in an integrated airspace. Possible approaches for UAVs are surveyed and broken down based on their types of surveillance, coordination, maneuver, and autonomy. The factors are combined back selectively, with...journal article 2016