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Sun, Junzi (author), Hoekstra, J.M. (author), Ellerbroek, Joost (author)The aerodynamic properties of an aircraft determine a crucial part of the aircraft performance model. Deriving accurate aerodynamic coefficients requires detailed knowledge of the aircraft’s design. These designs and parameters are well protected by aircraft manufacturers. They rarely can be used in public research. Very detailed aerodynamic...conference paper 2018
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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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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
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Hoekstra, M. (author)Currently wastewater treatment plants (WWTP) consume a lot of energy and surface area. While the incoming water contains chemical energy (BOD) and reusable resources which are not effectively utilized. The ideal is to develop a treatment scheme which allows for the efficient removal of pollutants while minimizing the energy input and maximizing...doctoral thesis 2017
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Metz, I.C. (author), Muhlhausen, Thorsten (author), Ellerbroek, Joost (author), Hoekstra, J.M. (author), Kügler, D. (author)The presented research evaluates the concept of providing an airport’s Air Traffic Control with a bird strike advisory system. Such a system informs the controller about current and predicted bird movements in the arrival and departure corridors. Based on this information, the controller can decide to delay or reroute air traffic in order to...abstract 2017
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Sun, Junzi (author), Ellerbroek, Joost (author), Hoekstra, J.M. (author)Open access to flight data from ADS-B (Automatic Dependent Surveillance Broadcast) has provided researchers 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 parameters....conference paper 2017
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Hendrickx, T (author), Vogelaar, Jaap (author), Geilvoet, S (author), Duin, O (author), van Erp Taalman Kip, C (author), Hoekstra, M. (author)De doelstelling van het CENIRELTA project was aan te tonen dat Anammox in de hoofdstroom van een rwzi een effectieve, robuuste, kosten-efficiënte en duurzame technologie biedt voor de verwijdering van stikstof uit huishoudelijk afvalwater. De effectiviteit en robuustheid van het hoofdstroom Anammox proces zijn beproefd op rwzi Dokhaven in...book 2017
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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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Wijnberg, K.M. (author), Nijhuis, S. (author), Hulscher, SJMH (author), van Bergen, J. (author), Meyer, Han (author), Hoonhout, B. (author), Janssen, M. (author), Hoekstra, J.D. (author), de Groot, A.V. (author), Goessen, P. (author), van Gelder-Maas, C. (author)The land-sea interface is a very attractive location for humans to settle. In the case of low lying, sedimentary coastlines this can be a risky location, as these shorelines are inherently dynamic in nature. Accelerating rates of relative sea level rise will increase coastal erosion, creating world-wide growing demands for coastal protection...abstract 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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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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Sunil, E. (author), Ellerbroek, Joost (author), Hoekstra, J.M. (author), Maas, J.B. (author)In the context of decentralized separation, airspace stability pertains to the propagation of con?ict chain reactions as a result of tactical con?ict resolution maneuvers. This notion of airspace stability has been used in previous literature to develop a semi-empirical method for determining the capacity of a decentralized direct-routing...conference paper 2017
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Sun, Junzi (author), Ellerbroek, Joost (author), Hoekstra, J.M. (author)Open access to flight data from ADS-B (Automatic Dependent Surveillance Broadcast) has provided researchers 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 parameters....other 2017
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Tra, M.A.P. (author), Sunil, E. (author), Ellerbroek, Joost (author), Hoekstra, J.M. (author), Maas, J.B. (author)Previous research relating airspace structure and ca-pacity has shown that a decentralized layered airspace concept, in which each altitude band limited horizontal travel to within a prede?ned heading range, improved safety when compared to unstructured airspace. However, the extent of the safety bene?ts of such layered airspace designs were not...conference paper 2017
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Verbraak, T.L. (author), Ellerbroek, Joost (author), Sun, Junzi (author), Hoekstra, J.M. (author)To investigate the contradicting findings of previous studies that investigated ADS-B quality, a study was per-formed to analyze the data and signal quality of ADS-B. For this study, a large dataset of raw ADS-B messages was analyzed, regarding the quality of the data and the signal, differentiating between internal and external sources of...conference paper 2017
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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 ATM topics. However, it is a common challenge for researchers who have no access to this proprietary information. Previously, several studies have proposed methods to estimates aircraft weight, most of which are focused on...conference paper 2017
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Vanwelsenaere, A.J.G. (author), Ellerbroek, Joost (author), Hoekstra, J.M. (author), Westerveld, E (author)The occurrence of pop-up flights negatively affects the (extended) arrival manager. This issue is known already for a long time by operational experts, but the extent thereof has now been assessed during experiments. An arrival manager research model was developed and integrated in BlueSky, an open-source air traffic management simulator. Fast...conference paper 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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Sun, Junzi (author), Vû, Huy (author), Ellerbroek, Joost (author), Hoekstra, J.M. (author)Wind is an important parameter in many air traffic management researches, as it often introduces significant uncertainties in aircraft performance studies and trajectory predictions. Obtaining accurate wind field information has always been a challenge due to the availability of weather sensors. Traditionally, there is no direct method to...conference paper 2017