Searched for: subject:"Wakefulness"
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Kocevska, D. (author), Lysen, T.S. (author), Dotinga, A. (author), Koopman-Verhoeff, M.E. (author), Luijk, M.P.C.M. (author), Antypa, N. (author), Biermasz, N.R. (author), Blokstra, A. (author), Brug, J. (author), Burk, W.J. (author), Comijs, H.C. (author), Corpeleijn, E. (author), Dashti, H.S. (author), de Bruin, E.J. (author), de Graaf, R. (author), Derks, I.P.M. (author), Dewald-Kaufmann, J.F. (author), Elders, P.J.M. (author), Gemke, R.J.B.J. (author), Grievink, L. (author), Hale, L. (author), Hartman, C.A. (author), Heijnen, C.J. (author), Huisman, M. (author), Huss, A. (author), Ikram, M.A. (author), Jones, S.E. (author), Klein Velderman, M. (author), Koning, M. (author), Meijer, A.M. (author), Meijer, K. (author), Noordam, R. (author), Oldehinkel, A.J. (author), Groeniger, J.O. (author), Penninx, B.W.J.H. (author), Picavet, H.S.J. (author), Pieters, S. (author), Reijneveld, S.A. (author), Reitz, E. (author), Renders, C.M. (author), Rodenburg, G. (author), Rutters, F. (author), Smith, M.C. (author), Singh, A.S. (author), Snijder, M.B. (author), Stronks, K. (author), ten Have, M, (author), Twisk, J.W.R. (author), van de Mheen, D. (author), van der Ende, J. (author), van der Heijden, K.B. (author), van der Velden, P.G. (author), van Lenthe, F.J. (author), van Litsenburg, R.R.L (author), van Oostrom, S.H. (author), van Schalkwijk, F.J. (author), Sheehan, CM, (author), Verheij, RA, (author), Verhulst, F.C. (author), Vermeulen, M.C.M. (author), Vermeulen, R.C.H. (author), Verschuren, W.M.M. (author), Vrijkotte, T.G.M. (author), Wijga, A.H. (author), Willemen, A.M. (author), ter Wolbeek, M. (author), Wood, A.R. (author), Xerxa, Y. (author), Bramer, W.M. (author), Franco, O.H. (author), Luik, A.I. (author), van Someren, E.J.W. (author), Tiemeier, H. (author)
We aimed to obtain reliable reference charts for sleep duration, estimate the prevalence of sleep complaints across the lifespan and identify risk indicators of poor sleep. Studies were identified through systematic literature search in Embase, Medline and Web of Science (9 August 2019) and through personal contacts. Eligible studies had to be...
article 2021
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Doekemeijer, B.M. (author), Kern, S. (author), Maturu, S. (author), Kanev, S. (author), Salbert, B. (author), Schreiber, J. (author), Campagnolo, F. (author), Bottasso, C.L. (author), Schuler, S. (author), Wilts, F. (author), Neumann, T. (author), Potenza, G. (author), Calabretta, F. (author), Fioretti, F. (author), van Wingerden, J.W. (author)
The concept of wake steering on wind farms for power maximization has gained significant popularity over the last decade. Recent field trials described in the literature not only demonstrate the real potential of wake steering on commercial wind farms but also show that wake steering does not yet consistently lead to an increase in energy...
article 2021
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Wagenaar, J.W. (author)
This chapter addresses met mast measurements for wind turbine wake research, where we tackle the matter by posing and answering three questions. By asking ourselves what the value is of met mast measurements for wake/aerodynamic research, we describe how met masts can be and have been used in aerodynamic research, accompanied by a number of...
bookPart 2021
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Kanev, S. (author)
Wake redirection is a wind farm control strategy that aims at increasing the overall power yield of a wind farm. It involves intentional misalignment of the rotors of upstream wind turbines with respect to the wind direction, thereby diverting their wakes aside from downstream turbines. The yaw misalignment angles are typically optimized using...
article 2020
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Kanev, S.K. (author), Bot, E. (author), Giles, J. (author)
Active wake control (AWC) is a strategy for operating wind farms in such a way as to reduce the wake effects on the wind turbines, potentially increasing the overall power production. There are two concepts to AWC: induction control and wake redirection. The former strategy boils down to down-regulating the upstream turbines in order to increase...
article 2020
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Neunaber, I. (author), Holling, M. (author), Stevens, R.J.A.M. (author), Schepers, J.G. (author), Peinke, J. (author)
Wind turbines are usually clustered in wind farms which causes the downstream turbines to operate in the turbulent wakes of upstream turbines. As turbulence is directly related to increased fatigue loads, knowledge of the turbulence in the wake and its evolution are important. Therefore, the main objective of this study is a comprehensive...
article 2020
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Belfroid, S.P.C. (author), González-Díez, N. (author), Pereboom, H.P. (author), Tümer, C. (author)
Multiphase conditions can lead to high vibration in flexible pipe systems due to high dynamic flow induced forces. To better model the dynamic forces, large scale 6” air-water, near-atmospheric experiments have been done with different bend radii and upstream configurations. This paper gives an overview of the obtained results with respect to...
conference paper 2019
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Kanev, S. (author)
Active wake control (AWC) is an operational strategy for wind farms that aims at reducing the negative effects of wakes behind wind turbines on the power production and mechanical loads at the wind turbines' downstream. For a given wind direction, the strategy relies on collaborative control of the machines within each row of turbines that...
article 2019
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Kanev, S.K. (author), Savenije, F.J. (author), Engels, W.P. (author)
The wind turbines within a wind farm impact each other's power production and loads through their wakes. Wake control strategies, aiming to reduce wake effects, receive increasing interest by both the research community and the industry. A number of recent simulation studies with high fidelity wake models indicate that wake mitigation control is...
article 2018
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Boorsma, K. (author), Greco, L. (author), Bedon, G. (author)
Results from the EU AVATAR project have indicated vortex methods generally to be in good agreement with computational fluid dynamics simulations for resolving rotor aerodynamic forces in a variety of operational and inflow conditions. Limitations of the more crude blade element momentum method, most widely used in industry, have been exposed....
conference paper 2018
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Rahimi, H. (author), Garcia, A.M. (author), Stoevesandt, B. (author), Peinke, J. (author), Schepers, J.G. (author)
This work presents a significantly improved engineering model for the prediction of the loads in yawed flow. The newly developedmodel focuses on the so-called skewedwake effect. This effect leads to an azimuthal variation of the axial induction velocity which depends on the yawangle, tip speed ratio,wind speed, andradial position.Theazimuthal...
article 2018
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Brodecki, M. (author), Subbarao, K. (author), Chu, Q.P. (author)
Emergent behavior of a formation flight control system based on an advanced extremum seeking algorithm is investigated. The control system was implemented on a nonlinear high fidelity aircraft model and combined with a wake vortex model in order to accurately represent the aerodynamic coupling experienced by members of a formation. The desired...
conference paper 2013
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Bouma, H. (author), Dekker, R.J. (author), Schoemaker, R.M. (author), Mohamoud, A.A. (author)
This paper aims at the segmentation of seafaring vessels in optical satellite images, which allows an accurate length estimation. In maritime situation awareness, vessel length is an important parameter to classify a vessel. The proposed segmentation system consists of robust foreground-background separation, wake detection and ship-wake...
conference paper 2013
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Huang, X. (author), Rampu, S. (author), Wang, X. (author), Dolmans, G. (author), de Groot, H. (author), TNO Industrie en Techniek (author)
In order to simultaneously optimize network lifetime and latency in wireless sensor networks (WSN), an always-on wake-up receiver (WuRx) can be used to monitor the radio link continuously. For truly autonomous sensor nodes employing energy scavenging, only 50μW power is available for the WuRx [1]. An envelope detector is a popular choice in WuRx...
conference paper 2010
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Schippers, P. (author)
The acoustic modelling in TNO’s ALMOST (=Acoustic Loss Model for Operational Studies and Tasks) uses a bubble migration model as realistic input for wake modelling. The modelled bubble cloud represents the actual ship wake. Ship hull, propeller and bow wave are the main generators of bubbles in the wake. The bubble volume originates from the...
conference paper 2009
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Zoeteweij, M.L. (author), van der Donck, J.C.J. (author), Versluis, R. (author), TNO Industrie en Techniek (author)
In many industrial processes, particle contamination is becoming a major issue. Particle detachment from surfaces can be detrimental, e.g., during lithographic processing. During cleaning, however, detachment of particles is aimed for. However, until recently, only little was known on the mechanism of particle detachment due to flowing gasses....
article 2009
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van Roermund, H.M. (author), Baltus, P. (author), van Bezooijen, A. (author), Hegt, J.A. (author), Lopelli, E. (author), Mahmoudi, R. (author), Radulov, G.I. (author), Vidojkovic, M. (author), TNO Industrie en Techniek (author)
An integral multi-disciplinary chain optimization based on a high-level cascaded Shannon-based channel modeling is proposed. It is argued that the analog part of the front-end (FE) will become a bottleneck in the overall chain. This requires a FE-centric design approach, aiming for maximizing the effective data capacity, and for an optimal...
article 2009
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Raymann, R.J.E.M. (author), Swaab, D.F. (author), Van Someren, E.J.W. (author), TNO Defensie en Veiligheid (author)
With ageing, an increasingly disturbed sleep is reported as a significant complaint affecting the health and well-being of many people. The available treatments for sleep disturbance have their limitations, so we have adopted a different approach to the improvement of sleep. Since in animal and human studies skin warming has been found to...
article 2008
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TNO Defensie en Veiligheid (author), van Vliet, S.A.M. (author), Jongsma, M.J. (author), Vanwersch, R.A.P. (author), Olivier, B. (author), Philippens, I.H.C.H.M. (author)
article 2008
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van den Berg, J.F. (author), Knvistingh Neven, A. (author), Tulen, J.H.M. (author), Hofman, A. (author), Witteman, J.C.M. (author), Miedema, H.M.E. (author), Tiemeier, H. (author), TNO Bouw en Ondergrond (author)
Objective: The epidemiological evidence for the association between sleep duration and obesity in the elderly is inconsistent and has not been investigated with objective measures. Furthermore, the role of sleep fragmentation in this relationship is unknown. Our aim was to investigate the association of sleep measures with body mass index (BMI)...
article 2008
Searched for: subject:"Wakefulness"
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