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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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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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van de Ven, E.A. (author), Maas, Robert (author), Ayas, C. (author), Langelaar, Matthijs (author), van Keulen, A. (author)It is attractive to combine topology optimization (TO) with additive manufacturing (AM), due to the design freedom provided by AM, and the increased performance that can be achieved with TO. One important aspect is to include the design rules associated with the process restrictions of AM to prevent the requirement of relatively large support...journal article 2020
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Krielaart, M.A.R. (author), Maas, D.J. (author), Loginov, S. (author), Kruit, P. (author)We designed and built a compact bi-axial electron beam separator. This separator is an indispensable electron optical element in the development of MEMS-mirror-based miniaturized concepts for quantum electron microscopy (QEM) and aberration-corrected low-voltage scanning electron microscopy (AC-SEM). The separator provides the essential...journal article 2020
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Schallig, Wouter (author), van den Noort, Josien C. (author), McCahill, Jennifer (author), Stebbins, Julie (author), Leardini, Alberto (author), Maas, Mario (author), Harlaar, J. (author), van der Krogt, Marjolein M. (author)Background: The Oxford Foot Model (OFM) and Rizzoli Foot Model (RFM) are the two most frequently used multi-segment models to measure foot kinematics. However, a comprehensive comparison of the kinematic output of these models is lacking. Research question: What are the differences in kinematic output between OFM and RFM during normal gait...journal article 2020
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Rovira Navarro, M. (author), Rieutord, Michel (author), Gerkema, Theo (author), Maas, Leo R.M. (author), van der Wal, W. (author), Vermeersen, L.L.A. (author)Some of the moons of the outer solar system harbour subsurface liquid oceans. Tidal dissipation plays an important role in preventing these oceans from freezing. In the past, most studies considered only tidal dissipation in the solid layers of these bodies (rock and ice). Recently, new studies considering tidal dissipation in the oceans of...journal article 2019
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Obergfell, C.C.A. (author), Bakker, M. (author), Maas, C. (author)A new method is presented to estimate average diffuse aquifer recharge of water table aquifers in temperate climates using time series analysis of water table level fluctuations. An accurate estimate of the recharge caused by rainfall requires an accurate estimate of the influence of evaporation. In temperate climates, evaporation imprints a...journal article 2019
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Schallig, W. (author), van den Noort, J. C. (author), Kleipool, R. P. (author), Dobbe, J. G.G. (author), van der Krogt, M. M. (author), Harlaar, J. (author), Maas, M. (author), Streekstra, G. J. (author)Computed tomography (CT) imaging can be used to determine bone pose, sometimes combined with skin-mounted markers. For this specific application, a lower radiation dose than the conventional clinical dose might suffice. This study aims to determine how lowering the radiation dose of a CT-scan of the ankle and foot affects the precision of...journal article 2019
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Obergfell, C.C.A. (author), Bakker, M. (author), Maas, C. (author)Time series analysis is applied to identify and analyze a transition in the groundwater regime in the aquifer below the sand ridge of Salland in the Netherlands, where groundwater regime refers to the range of head variations throughout the seasons. Standard time series analysis revealed a discrepancy between modeled and observed heads in...journal article 2019
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Zhao, Song Chuan (author), Maas, Mariska (author), Jansen, K.M.B. (author), van Hecke, Martin (author)Additive manufacturing strives to combine any combination of materials into 3D functional structures and devices, ultimately opening up the possibility of 3D printed machines. It remains difficult to actuate such devices, thus limiting the scope of 3D printed machines to passive devices or necessitating the incorporation of external actuators...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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- van de Ven, E.A. (author), Langelaar, Matthijs (author), Ayas, C. (author), Maas, Robert (author), van Keulen, A. (author) abstract 2018
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Maas, J.B. (author), van Gent, R.N.H.W. (author), Hoekstra, J.M. (author)Object tracking is performed when surveillance applications have multiple observations of an object over time. An example of such a surveillance application is mounting a wideangle Frequency Modulated Continuous Wave (FMCW) radar system on board of a General Aviation aircraft. This is done in order to observe its environment in detail, including...conference paper 2018
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Hoekstra, J.M. (author), Ellerbroek, Joost (author), Sunil, E. (author), Maas, J.B. (author)Both U-space in Europe, as well as UTM in the USA, develop concepts and tools for UAV airspace. Enabling highdensity operations is one of the goals of these studies. Past and recent studies have analysed which factors affect the capacity of a UAV airspace. An improved understanding of this can lead to control methods for capacity management. Two...conference paper 2018
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- Maas, Huub (author), Veeger, H.E.J. (author), Stegeman, Dick F. (author) contribution to periodical 2018
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Xie, Wei (author), Nunez, Alfredo (author), Maas, Ron (author), Li, Z. (author)This paper presents a methodology to support decision making based on the tram wheel-rail interface condition. The methodology relies on the following measurements: tram failure log-files regarding wheel-sliding events, monitored acoustics data and open source weather information. The proposed methodology consists of three stages: 1) data...conference paper 2018
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Mirakhorlo, M. (author), Van Beek, N. (author), Wesseling, M. (author), Maas, H. (author), Veeger, H.E.J. (author), Jonkers, I. (author)To improve our understanding on the neuromechanics of finger movements, a comprehensive musculoskeletal model is needed. The aim of this study was to build a musculoskeletal model of the hand and wrist, based on one consistent data set of the relevant anatomical parameters. We built and tested a model including the hand and wrist segments, as...journal article 2018
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Mirakhorlo, M. (author), Maas, H. (author), Veeger, H.E.J. (author)Aging has consequences for hand motor control, among others affecting finger force enslaving during static pressing tasks. The aim of this study was to assess whether the extent of finger force enslaving changes with aging during a task that involves both static and dynamic phases. Ten right-handed young (22–30 years) and ten elderly subjects...journal article 2018
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Haberfehlner, Helga (author), Jaspers, Richard T. (author), Rutz, Erich (author), Harlaar, J. (author), Van Der Sluijs, Johannes A. (author), Witbreuk, Melinda (author), van Hutten, Kim (author), Romkes, Jacqueline (author), Freslier, Marie (author), Brunner, Reinald (author), Becher, Jules G. (author), Maas, H. (author), Buizer, Annemieke I. (author)To improve gait in children with spastic paresis due to cerebral palsy or hereditary spastic paresis, the semitendinosus muscle is frequently lengthened amongst other medial hamstring muscles by orthopaedic surgery. Side effects on gait due to weakening of the hamstring muscles and overcorrections have been reported. How these side effects...journal article 2018