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Sun, Junzi (author), Hoekstra, J.M. (author), Ellerbroek, Joost (author)Air traffic simulations serve as common practice to evaluate different concepts and methods for air transportation studies. The aircraft performance model is a key element that supports these simulation-based studies. It is also an important component for simulation-independent studies, such as air traffic optimization and prediction studies....journal article 2020
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Hoekstra, N. (author), Pellegrini, M. (author), Bloemendal, Martin (author), Spaak, G. (author), Andreu Gallego, A. (author), Rodriguez Comins, J. (author), Grotenhuis, T. (author), Picone, S. (author), Murrell, A. J. (author)Heating and cooling using aquifer thermal energy storage (ATES) has hardly been applied outside the Netherlands, even though it could make a valuable contribution to the energy transition. The Climate-KIC project “Europe-wide Use of Energy from aquifers” – E-USE(aq) – aimed to pave the way for Europe-wide application of ATES, through the...journal article 2020
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Deng, Wen Jing (author), Hoekstra, J.S.C.M. (author), Elsinga, M.G. (author)Worldwide, housing is increasingly unaffordable for young people, many of whom rely on intergenerational transfers of assets to enter home ownership. This paper aims to qualitatively analyze the impacts of the welfare state and family reciprocity on young people's opportunity to access home ownership. Evidence from in-depth interviews with...journal article 2020
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Hoekstra, J. (author)The purpose of this paper is to investigate the two-capacitor paradox using circuit models developed in the analysis of circuits that include nanoelectronic single-electron tunneling devices. The two-capacitor paradox, in which it seems that energy is not conserved in a simple circuit consisting of two capacitors in parallel separated by an...journal article 2020
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Sun, Junzi (author), Blom, H.A.P. (author), Ellerbroek, Joost (author), Hoekstra, J.M. (author)This article investigates the estimation of aircraft mass and thrust settings of departing aircraft using a recursive Bayesian method called particle filtering. The method is based on a nonlinear state-space system derived from aircraft point-mass performance models. Using only aircraft surveillance data, flight states such as position,...journal article 2019
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Cazaux, S.M. (author), Arribard, Yann (author), Egorov, Dmitrii (author), Palotás, Julianna (author), Hoekstra, Ronnie (author), Berden, Giel (author), Oomens, Jos (author), Schlathölter, Thomas (author)The solar magnetic field (SMF) has historically been considered as dipole in order to build models of the radially expanding corona, that is, the solar wind in the solar minimum. The simplified approach suggests the existence of only one quasi-stationary current sheet (QCS) of solar origin in the heliosphere, namely, the heliospheric current...journal article 2019
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Litheko, Olebogeng (author), Marais, Lochner (author), Hoekstra, J.S.C.M. (author), Cloete, Jan (author), Lenka, Molefi (author)Asset-building policies are used worldwide to reduce state welfare commitments. In the Global South, including South Africa, asset-based housing development is thought to help reduce poverty. This study investigated asset building and homeownership in a sample of South Africa’s emerging black middle class. Interviews with 244 black middle-class...journal article 2019
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Kragt, Augustinus J.J. (author), Hoekstra, Davey C. (author), Stallinga, S. (author), Broer, Dirk J. (author), Schenning, Albertus P.H.J. (author)Engineering the helical structure of chiral photonic materials in three dimensions remains a challenge. 3D helix engineered photonic materials are fabricated by local stratification in a photopolymerizable chiral nematic liquid crystal. The obtained chiral photonic materials reflect both handedness of circular polarized light and show super...journal article 2019
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Rudnyk, I. (author), Ellerbroek, Joost (author), Hoekstra, J.M. (author)To facilitate the increasing amount of air traffic, current and future decision support tools for air traffic management require an efficient and accurate trajectory prediction. With uncertainty inherent to almost all inputs of a trajectory predictor, the accurate prediction is not a simple task. In this study, Monte Carlo simulations of a...journal article 2019
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Groen, Brenda (author), van der Voordt, Theo (author), Hoekstra, B.S. (author), van Sprang, Hester (author)Purpose: This paper aims to explore the relationship between satisfaction with buildings, facilities and services and perceived productivity support and to test whether the findings from a similar study of Batenburg and Van der Voordt (2008) are confirmed in a repeat study after 10 years with more recent data. Design/methodology/approach:...journal article 2019
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Sun, Junzi (author), Ellerbroek, Joost (author), Hoekstra, J.M. (author)Open access to flight data from Automatic Dependent Surveillance-Broadcast (ADS-B) has provided researchers with more insights for air traffic management than aircraft tracking alone. With large quantities of trajectory data collected from a wide range of different aircraft types, it is possible to extract accurate aircraft performance...journal article 2019
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Low carbon heating and cooling by combining various technologies with Aquifer Thermal Energy StoragePellegrini, M. (author), Bloemendal, Martin (author), Hoekstra, N. (author), Spaak, G. (author), Andreu Gallego, A. (author), Rodriguez Comins, J. (author), Grotenhuis, T. (author), Picone, S. (author), Murrell, A. J. (author)A transition to a low carbon energy system is needed to respond to global challenge of climate change mitigation. Aquifer Thermal Energy Storage (ATES) is a technology with worldwide potential to provide sustainable space heating and cooling by (seasonal) storage and recovery of heat in the subsurface. However, adoption of ATES varies strongly...journal article 2019
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Sun, Junzi (author), Vû, Huy (author), Ellerbroek, Joost (author), Hoekstra, J.M. (author)The availability of low-cost automatic dependent surveillance-broadcast (ADS-B) receivers has given researchers the ability to make use of large amounts of aircraft state data. This data is being used to support air transportation research in performance study, trajectory prediction, procedure analysis, and airspace design. However, aircraft...journal article 2019
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Sunil, E. (author), Ellerbroek, Joost (author), Hoekstra, J.M. (author), Maas, J.B. (author)This paper presents analytical models that describe the safety of unstructured and layered en route airspace designs. Here, ‘unstructured airspace’ refers to airspace designs that offer operators complete freedom in path planning, whereas ‘layered airspace’ refers to airspace concepts that utilize heading-altitude rules to vertically separate...journal article 2018
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Vanwelsenaere, Alexander (author), Ellerbroek, Joost (author), Hoekstra, J.M. (author), Westerveld, E (author)To assess the effect of flights departing within the horizon of the extended arrival manager (so-called popup flights), fast-time simulations are performed using an arrival manager research model. This model is tailored for operations at Amsterdam Schiphol Airport and integrated in BlueSky, which is an open-source air traffic management...journal article 2018
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Metz, I.C. (author), Muhlhausen, Thorsten (author), Ellerbroek, Joost (author), Kügler, Dirk (author), van Gasteren, Hans (author), Kraemer, Jan (author), Hoekstra, J.M. (author)Annually, thousands of birds collide with aircraft. The impact usually has lethal<br/>consequences for the bird, the involved aircraft can experience severe damage. The highest bird strike risk occurs at low altitudes. Therefore, aircraft within the airport area as well as the adjacent approach and departure corridors are especially vulnerable...journal article 2018
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van Driel, B.A. (author), Artesani, A. (author), van den Berg, K.J. (author), Dik, J. (author), Mosca, S. (author), Rossenaar, B. (author), Hoekstra, J. (author), Davies, A. (author), Nevin, A. (author), Valentini, G. (author), Comelli, D. (author)This work reports the analysis of the time-resolved photoluminescence behaviour on the nanosecond and microsecond time scale of fourteen historical and contemporary titanium white pigments. The pigments were produced with different production methods and post-production treatments, giving rise to a remarkable variability of titanium dioxide...journal article 2018
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Sun, Junzi (author), Ellerbroek, Joost (author), Hoekstra, J.M. (author)Aircraft mass is a crucial piece of information for studies on aircraft performance, trajectory prediction, and many other topics of aircraft traffic management. However, It is a common challenge for researchers, as well as air traffic control, to access this proprietary information. Previously, several studies have proposed methods to estimate...journal article 2018
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Hoekstra, M. (author), Geilvoet, Stefan P. (author), Hendrickx, Tim L.G. (author), van Erp Taalman Kip, Charlotte S. (author), Kleerebezem, R. (author), van Loosdrecht, Mark C.M. (author)The aim of this research was to study the biological feasibility of the Partial Nitritation/Anammox (PN/A) technology to remove nitrogen from municipal mainstream wastewaters. During stable process operations at summer temperatures (23.2 ± 1.3°C), the total nitrogen removal rate was 0.223 ± 0.029 kg N (m<sup>3 </sup>d)<sup>−1</sup> while at...journal article 2018
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Hoekstra, A.T.G. (author), Twisk, D. A. M. (author), Hagenzieker, Marjan (author)Research in different domains has shown that people categorize oneself and others as ingroup (“us”) and outgroup (“them”) members, resulting in group-based stereotyping and attribution errors that may adversely affect social behaviour. To determine whether such patterns also exist in road traffic, we conducted an experimental web-based survey...journal article 2018