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Doole, M.M. (author), Ellerbroek, Joost (author), Hoekstra, J.M. (author)Drone-based delivery is likely to reduce energy and greenhouse gas emissions associated with the transport of small express packages, fast-food meals and medicines, especially when deployed in large-scale in urban areas. However, it is an enormous challenge to facilitate such high traffic densities in constrained urban environments. A recent...conference paper 2021
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Badea, C. (author), Morfin Veytia, A. (author), Ribeiro, M.J. (author), Doole, M.M. (author), Ellerbroek, Joost (author), Hoekstra, J.M. (author)Road traffic delay and urban overcrowding are increasing rapidly all over the world. As a result, several companies have proposed the use of small unmanned aerial vehicles (sUAVs) as an alternative to road-based transportation. These small autonomous drones are expected to operate within a thin airspace band (Very Low Level) in high traffic...conference paper 2021
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Caranti, L. (author), Ribeiro, M.J. (author), Ellerbroek, Joost (author), Hoekstra, J.M. (author)The capacity of the current system of air traffic is rapidly reaching a limit with the increasing demand for air transportation. Expected future traffic densities not only make automated conflict detection and resolution a necessity, but also force a re-evaluation of coordination elements to decrease conflict rate and severity. It has been...conference paper 2021
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Ahedo, Manuel (author), Hoekstra, J.S.C.M. (author), Extezarreta, Aitziber (author)National housing systems increasingly combine three main types of housing: the private property sector (home ownership and private rental), social and public rental (public and non-profit sectors) and cooperative (social or civil economy). The dominant private type has facilitated housing speculation, which in many countries has become a...journal article 2021
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Gentili, M. (author), Hoekstra, J.S.C.M. (author)Access to homeownership for young adults is becoming more and more difficult. Italy – where homeownership rates for young adults are steadily decreasing – is a case in point. In the recent past, becoming homeowner was an obvious housing pathway for Italian young adults, even from lower-middle class families. If your parents were homeowner,...journal article 2021
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Doole, M.M. (author), Ellerbroek, Joost (author), Knoop, V.L. (author), Hoekstra, J.M. (author)Large-scale adoption of drone-based delivery in urban areas promise societal benefits with respect to emissions and on-ground traffic congestion, as well as potential cost savings for drone-based logistic companies. However, for this to materialise, the ability of accommodating high volumes of drone traffic in an urban airspace is one of the...journal article 2021
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Metz, I.C. (author), Ellerbroek, Joost (author), Mühlhausen, Thorsten (author), Kügler, Dirk (author), Hoekstra, J.M. (author)Bird strike prevention in civil aviation has traditionally focused on the airport perimeter. Since the risk of especially damaging bird strikes outside the airport boundaries is rising, this paper investigates the safety potential of operational bird strike prevention involving pilots and controllers. In such a concept, controllers would be...journal article 2021
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Metz, I.C. (author), Ellerbroek, Joost (author), Mühlhausen, Thorsten (author), Kügler, Dirk (author), Kern, Stefan (author), Hoekstra, J.M. (author)Involving air traffic controllers and pilots into the bird strike prevention process is considered an essential step to increase aviation and avian safety. Prior to implementing operational measures such as real-time warning systems, it is vital to evaluate their feasibility. This paper studies the efficacy of a bird strike advisory system for...journal article 2021
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Hoekstra, J.S.C.M. (author), Dol, C.P. (author)The ageing of European societies, the mounting pressure on pension systems, the rise of home ownership and the growth in house prices have sparked interest in housing equity release options and strategies. Much of the available literature approaches this topic through a financial lens, focusing on equity release schemes as a way to free up...journal article 2021
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Maas, J.B. (author), van Gent, R.N.H.W. (author), Hoekstra, J.M. (author)A detailed situation awareness of the local environment is essential for safe flight in General Aviation. When operating under Visual Flight Rules, eyesight is crucial for maintaining situation awareness and objects may be overlooked. Technical solutions such as Flarm have been sought, but they only work on a basis of co-operation: obstacles...journal article 2020
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Doole, M.M. (author), Ellerbroek, Joost (author), Hoekstra, J.M. (author)Driven by rising consumer demand, interest is growing in the application of autonomous unmanned aerial vehicles (drones) for the last-mile delivery of small express packages and fast-food meals in cities. To be realised, this would require the Very Low Level (VLL) urban airspace to be able to cope with high traffic densities of commercial...journal article 2020
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Hoekstra, J.S.C.M. (author), Gentili, M. (author)This report is part of deliverable 4.1 of the H2020 UPLIFT project. It outlines the theoretical and methodological principles of the process of reflexive policy-making that will take place in four UPLIFT implementation sites. In the first part of this report (chapters 2 and 3), these principles are outlined in more detail. After that, a brief...report 2020
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Ribeiro, M.J. (author), Ellerbroek, Joost (author), Hoekstra, J.M. (author)Current investigations into urban aerial mobility, as well as the continuing growth of global air transportation, have renewed interest in Conflict Detection and Resolution (CD&R) methods. With the new applications of drones, and the implications of a profoundly different urban airspace, new demands are placed on such algorithms, further...review 2020
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Schlathölter, Thomas (author), Mostafa, Yahia (author), Kamman, Amber (author), Dongelmans, Arnold (author), Arribard, Yann (author), Cazaux, S.M. (author), Hoekstra, Ronnie (author)Abstract: When exposed to a thermal beam of hydrogen atoms, gas-phase coronene cations C<sub>24</sub>H<sub>12</sub><sup>+</sup> can be sequentially hydrogenated. This process is accompanied by a gradual transition of the electronic structure from aromatic to aliphatic. The planar very stable coronene structure transforms into the...journal article 2020
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- Albeda, Hein (author), Hoekstra, J.S.C.M. (author), Van Beusekom, Evelien (author) report 2020
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Maas, J.B. (author), Stefanovici, V. (author), van Gent, R.N.H.W. (author), Hoekstra, J.M. (author)Many pilots in General Aviation use electronic add-ons aids in flight, which rely on satellite navigation information. This navigation information is often a single point of failure which is undesirable since the pilot relies on the information. This paper presents the results of research whether a novel mobile radar station can be used to...conference paper 2020
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Maas, J.B. (author), van Gent, R.N.H.W. (author), Hoekstra, J.M. (author)Although the main goal of a newly developed Collision Alert Radar is to observe airborne targets, it was found that reflections of the ground are received by the radar. The radar is carried on board of the aircraft, and the ground reflections may be used to detect flight information with respect to the terrain, something which is not possible...conference paper 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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- Hoekstra, J.S.C.M. (author) review 2020
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Ribeiro, M.J. (author), Ellerbroek, Joost (author), Hoekstra, J.M. (author)The use of drones for applications such as package delivery, in an urban setting, would result in traffic densities that are orders of magnitude higher than any observed in manned aviation. Current geometric resolution models have proven to be very efficient at relatively moderate densities. However, at higher densities, performance is hindered...conference paper 2020