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van Keulen, T. (author), Naus, M.J.G. (author), de Jager, B. (author), van de Molengraft, G.J.L. (author), Steinbuch, M. (author), Aneke, N.P.I. (author), TNO Industrie en Techniek (author)
Deceleration rates have considerable influence on the fuel economy of hybrid electric vehicles. Given the vehicle characteristics and actual/measured operating conditions, as well as upcoming route information, optimal velocity trajectories can be constructed that maximize energy recovery. To support the driver in tracking of the energy optimal...
article 2009
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Keyvani Janbahan, A. (author), Sadeghian Marnani, H. (author), Tamer, M.S. (author), Goosen, J.F.L. (author), van Keulen, F. (author)
Due to the harmonic motion of the cantilever in Tapping Mode Atomic Force Microscopy, it is seemingly impossible to estimate the tip-sample interactions from the motion of the cantilever. Not directly observing the interaction force, it is possible to damage the surface or the tip by applying an excessive mechanical load. The tip-sample...
article 2017
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van Keulen, H.M. (author), Mesters, I. (author), Ausems, M. (author), van Breukelen, G. (author), Campbell, M. (author), Resnicow, K. (author), Brug, J. (author), de Vries, H. (author)
Background: Computer tailoring and motivational interviewing show promise in promoting lifestyle change, despite few head-to-head comparative studies. Purpose: Vitalum is a randomized controlled trial in which the efficacy of these methods was compared in changing physical activity and fruit and vegetable consumption in middle-aged Dutch adults....
article 2011
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Janssen, G.C.A.M. (author), Abdalla, M.M. (author), van Keulen, F. (author), Pujada, B.R. (author), van Venrooy, B. (author), TNO Industrie en Techniek (author)
Stress in a thin film on a flexible substrate induces a curvature of the substrate. Usually the substrate is orders of magnitude thicker than the film, leading to small and purely elastic deformation of the substrate. In this case, the Stoney equation yields the stress in the film from the measured curvature of the substrate. The Stoney equation...
article 2009
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van der Weijst, R. (author), van Keulen, T. (author), Willems, F.P.T. (author)
In the context of model-free optimization of dynamic nonlinear multiple-input-single-output (MISO) systems using extremum-seeking (ES), accurate and fast derivative estimation of the systems steady-state performance map is essential. This paper presents a generalized derivative estimator (DE) framework for unknown MISO static maps. To this...
article 2017
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van der Weijst, R. (author), van Keulen, T. (author), Willems, F.P.T. (author)
This work presents a new method for online fuel-efficiency optimization of Diesel engines, using constrained extremum-seeking. A two-input optimization problem, which is suitable for extremum-seeking, is integrated into a tracking control system. As a result, both air-path and fuel-path actuators are used for tracking and extremum-seeking. A key...
article 2019
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Oude Nijhuis, M.M. (author), van Keulen, J.K. (author), Pasterkamp, G. (author), Quax, P.H. (author), de Kleijn, D.P.V. (author), TNO Kwaliteit van Leven (author)
Innate immunity is the first line of defence against invading micro-organisms. The family of Toll-like receptors (TLRs) recognizes pathogen-associated molecular patterns (PAMPs) that are carried by the invading micro-organisms. Infectious pathogens have been implicated to play an important role in atherosclerosis. Nowadays, evidence is...
article 2007
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Keyvani Janbahan, A. (author), van der Veen, G. (author), Tamer, M.S. (author), Sadeghian Marnani, H. (author), Goosen, H. (author), van Keulen, F. (author)
The real-time and accurate measurement of tip-sample interaction forces in Tapping Mode Atomic Force Microscopy (TM-AFM) is a remaining challenge. This obstruction fundamentally stems from the causality of the physical systems. Since the input of the dynamic systems propagates to the output with some delay, and multiple different inputs can...
article 2020
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Keyvani Janbahan, A. (author), Sadeghian Marnani, H. (author), Goosen, H. (author), van Keulen, F. (author)
The origin of amplitude reduction in Tapping Mode Atomic Force Microscopy (TM-AFM) is typically attributed to the shift in resonance frequency of the cantilever due to the nonlinear tip-sample interactions. In this paper, we present a different insight into the same problem which, besides explaining the amplitude reduction mechanism, provides a...
article 2018
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Hollestelle, S.C.G. (author), de Vries, M.R. (author), van Keulen, J.K. (author), Schoneveld, A.H. (author), Vink, A. (author), Strijder, C.F. (author), van Middelaar, B.J. (author), Pasterkamp, G. (author), Q́uax, P.H.A. (author), de Kleijn, D.P.V. (author), TNO Preventie en Gezondheid (author)
Background-Toll-like receptor 4 (Tlr4) is the receptor for exogenous lipopolysaccharides (LPS). Expression of endogenous Tlr4 ligands, heat shock protein 60 (Hsp60) and extra domain A of fibronectin, has been observed in arthritic and oncological specimens in which matrix turnover is an important feature. In atherosclerosis, outward remodeling...
article 2004
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Mesters, I. (author), van Keulen, H.M. (author), de Vries, H. (author), Brug, J. (author)
Counselor competence in telephone Motivation Interviewing (MI) to change lifestyle behaviors in a primary care population was assessed using the Motivational Interviewing Treatment Integrity (MITI) rating system. Counselor behavior was evaluated by trained raters. Twenty minutes of a random sample of 336 MI sessions were coded representing 232...
article 2017
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Criens, C.H.A. (author), Willems, F.P.T. (author), van Keulen, T.A.C. (author), Steinbuch, M. (author)
This brief presents a novel and time-efficient control design for modern heavy-duty diesel engines using a variable geometry turbine and an exhaust gas recirculation valve. The goal is to simultaneously and robustly achieve low fuel consumption and low emissions of nitrogen oxides (NOx) and particulate matter (PM). A new combination of three...
article 2015
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Keyvani Janbahan, A. (author), Alijani, F. (author), Sadeghian Marnani, H. (author), Maturova, K. (author), Goosen, H. (author), van Keulen, F. (author)
This paper investigates the closed-loop dynamics of the Tapping Mode Atomic Force Microscopy using a new mathematical model based on the averaging method in Cartesian coordinates. Experimental and numerical observations show that the emergence of chaos in conventional tapping mode AFM strictly limits the imaging speed. We show that, if the...
article 2017
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Keyvani Janbahan, A. (author), Tamer, M.S. (author), van Wingerden, J.W. (author), Goosen, J.F.L. (author), van Keulen, F. (author)
Many investigations have focused on steady-state nonlinear dynamics of cantilevers in tapping mode atomic force microscopy (TM-AFM). However, a transient dynamic model?which is essential for a model-based control design?is still missing. In this paper, we derive a mathematical model which covers both the transient and steady-state behavior. The...
article 2019
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Gupta, D.K. (author), Langelaar, M. (author), Barink, M. (author), van Keulen, F. (author)
Free-form solar cells are cells of unconventional shapes (e.g. hexagonal, leaf-shaped etc). Their flexible shape adds to the aesthetics of the surroundings as well as allows to place them over objects where conventional solar cells might not fit. Evidently, these cells need to be efficient as well, and one of the important factors that controls...
article 2016
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Friederichs, S.A.H. (author), Oenema, A. (author), Bolman, C. (author), Guyaux, J. (author), van Keulen, H.M. (author), Lechner, L. (author)
The purpose of this study was to identify which question/reflection format leads to the most favorable results in terms of effect on autonomous motivation and appreciation for the intervention in a web-based computer-tailored physical activity (PA) intervention, based on principles from self-determination theory (SDT) and motivational...
article 2015
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van Keulen, H.M. (author), Otten, W. (author), Ruiter, R.A.C. (author), van Steenbergen, J. (author), Paulussen, T.W.G.M. (author), Fekkes, M. (author), Paulussen, T.W.G.M. (author)
Onderzoeken welke factoren deelname aan de HPV-vaccinatie bepaalden in 2009 en 2010. Opzet Retrospectief dwarsdoorsnede-onderzoek. Methode Uit een telepanel werden aselecte steekproeven getrokken van Nederlandse meisjes die in 2009 en 2010 werden opgeroepen voor de HPV-vaccinatie, evenals hun moeders. Gegevens werden verzameld via een online...
article 2013
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van Keulen, T. (author), van Mullem, D. (author), van Jager, B. (author), Kessels, J.T.B.A. (author), Steinbuch, M. (author)
Hybrid electric vehicles require an algorithm that controls the power split between the internal combustion engine and electric machine(s), and the opening and closing of the clutch. Optimal control theory is applied to derive a methodology for a real-time optimal-control-based power split algorithm. The presented strategy is adaptive for...
article 2012
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Gupta, D.K. (author), Langelaar, M. (author), Barink, M. (author), van Keulen, F. (author)
This paper presents the application of topology optimization (TO) for designing the front electrode patterns for solar cells. Improving the front electrode design is one of the approaches to improve the performance of the solar cells. It serves to produce the voltage distribution for the front surface such that the current flow through the solar...
article 2015
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Anraad, C. (author), Lehmann, B.A. (author), Visser, O. (author), van Empelen, P. (author), Paulussen, T.G.W. (author), Ruiter, R.A.C. (author), Kamp, L. (author), van der Maas, N.A.T. (author), Barug, D. (author), Ruijs, W.L.M. (author), Melkler, H.E. (author), Mollema, L. (author), van Keulen, H.M. (author)
Background: Maternal Pertussis Vaccination (MPV) during pregnancy became part of the National Immunization Program in the Netherlands late 2019. This study aims to identify social-psychological factors associated with MPV acceptance among Dutch women to add to the current understanding of vaccine hesitancy worldwide, and to inform the...
article 2020
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