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Peters, S.L.A. (author), Tabasi, A. (author), Kingma, I. (author), van Dijk, W. (author), van Dieën, J.H. (author)Mechanical loading of the low-back is an important risk factor for the development of low-back pain. Real-time estimation of the L5S1 joint moment (ML5S1) can give an insight to reduce mechanical loading. Model accuracy depends on sensor information, limiting the number of input variables to estimate ML5S1 increases practical feasibility, but...article 2023
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Bottenheft, C. (author), Groen, E.L. (author), Mol, D. (author), Valk, P.J.L. (author), Houben, M.M.J. (author), Kingma, B.R.M. (author), van Erp, J.B.F. (author)This study investigates how cognitive performance is affected by the combination of two stressors that are operationally relevant for helicopter pilots: heat load and hypobaric hypoxia. Fifteen participants were exposed to: 1) no stressors, 2) heat load, 3) hypobaric hypoxia and 4) combined heat load and hypobaric hypoxia. Hypobaric hypoxia (13...article 2023
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Verdenius, S.A. (author), Hengeveld, S.T. (author), Maljaars, J. (author)Train axle load measurements performed between 2012 and 2019 at 87 locations in the Dutch railway network are used to evaluate fatigue of railway bridges. The theoretical fatigue damage using realistic influence lines is determined for the measured loads and for the load model from Eurocode EN 1991-2 Annex D. It appears that this load model is ...article 2023
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Rodenburg, J.D. (author), Maljaars, J. (author), Hengeveld, S.T. (author), Vervuurt, A.H.J.M. (author)The fatigue life of orthotropic steel bridge decks in road bridges depends on the load effects exerted by heavy lorries. The contact surface of tyres is one of the important variables. Measurements described in the literature demonstrate that the actual tyre contact surfaces of today's traffic representative for Europe are shorter and slightly...article 2023
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de Looze, M. (author), de Vries, A. (author), Krause, F. (author), Baltrusch, S. (author)Determination of the effectivity, usability and acceptance of an exoskeleton for a specific job requires a three-stage approach in which we get a first impression of its usefulness and potential fit (field observation), in which we measure the work load reducing effect (controlled experiment), and in which we measure use and acceptance,...conference paper 2022
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Allaix, D.L. (author), Bigaj-van Vliet, A.J. (author), Visser, J.H.M. (author), Valcke, S.L.A. (author)The European Green Deal published by the European Commission in December 2019 has set the target of 50% reduction of CO2 emissions and primary material consumption by 2030 compared to the 1990 levels. The construction sector is one of the key sectors where significant improvements are necessary for reaching the European targets. Among the...conference paper 2022
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Bekdemir, C. (author), Doosje, E. (author), Seykens, X. (author)At present, the hydrogen combustion engine has gained renewed interest from the heavy-duty internal combustion engine (ICE) industry as an enabler for fast decarbonization of well-to-wheel emissions and reinforced by the vast commitment of key stakeholders to establish a green hydrogen infrastructure. Past studies have often focused on partial...conference paper 2022
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Tabasi, A. (author), Lazzaroni, M. (author), Brouwer, N.P. (author), Kingma, I. (author), van Dijk, W. (author), de Looze, M.P. (author), Toxiri, S. (author), Ortiz, J. (author), van Dieën, J.H. (author)The risk of low-back pain in manual material handling could potentially be reduced by back-support exoskeletons. Preferably, the level of exoskeleton support relates to the required muscular effort, and therefore should be proportional to the moment generated by trunk muscle activities. To this end, a regression-based prediction model of this...article 2022
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van den Boom, S.J. (author), Dragt, R.C. (author), van Veen, D. (author), van Daelen, E.C.M. (author), Berens, J. (author)Additive manufacturing provides the possibility to manufacture parts on demand and offers tremendous form freedom compared to traditional manufacturing methods. However, Fused Filament Fabrication (FFF) is not yet widely used for highly structurally loaded parts, as their strength is hard to control and to predict. In this work we aim to analyze...article 2021
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Brink, H.M.T. (author), Hitzenberger, R. (author), Keuken, M. (author)Elemental Carbon (EC) is a good indicator for aerosol air quality and a main component in global warming; therefore data on its historic concentration would be highly valuable for an assessment of historic levels. There were already major sources of EC in Europe in the early 20th century, but the component has only been measured since the late...article 2021
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van 't Westende, J.M.C. (author), van Nimwegen, A.T. (author), Belfroid, S.P.C. (author), Slot, H.J. (author)Experiments were performed to investigate the physics behind intermittent production and liquid loading, using a setup containing a reservoir model coupled to a vertical production tubing. In the experiments both gas and liquid are injected into the reservoir, which is a container in which sand with two different permeabilities is placed. Quick...conference paper 2021
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Kallen, V. (author), Tahir, M. (author), Bedard A., (author), Bongers, B. (author), van Riel, N. (author), van Meeteren, N. (author)Allostatic load reflects the cumulative strain on organic functions that may gradually evolve into overt disease. Our aim was to evaluate the allostatic parameters in the context of aging, and identify the parameters that may be suitable for an allostatic load index for elderly people (>60 years). From previously published studies, 11 allostatic...article 2021
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Wassing, B.B.T. (author), Candela, T.G.G. (author), Osinga, S. (author), Peters, E. (author), Buijze, L. (author), Fokker, P.A. (author), van Wees, J.D.A.M. (author)This paper describes and deploys a workflow to assess the evolution of seismicity associated to injection of cold fluids close to a fault. We employ a coupled numerical thermo-hydro-mechanical simulator to simulate the evolution of pressures, temperatures and stress on the fault. Adopting rate-and-state seismicity theory we assess induced...article 2021
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Pijnappel, T.R. (author), van den Berg, J.L. (author), Borst, S.C. (author), Litjens, R. (author)Drone base stations can help safeguard coverage and provide capacity relief when cellular networks are under stress. Examples of such stress scenarios are events with massive crowds or network outages. In this paper we focus on a disaster scenario with emergence of a traffic hotspot, where agile drone positioning and load management is a...conference paper 2021
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Post, B. (author), Borst, S. (author), van den Berg, J.L. (author)Due to the rising concerns of energy consumption in wireless networks, base station (BS) sleeping strategies were introduced to save energy in low traffic scenarios. In this paper we analyse a weighted trade-off between energy consumption and user-perceived performance in dense cellular networks. We present an optimization problem representing...article 2021
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Munsters, C.C.B.M. (author), Kingma, B.R.M. (author), van den Broek, J. (author), Sloet van Oldruitenborgh-Oosterbaan, M.M. (author)In human sport science, the acute:chronic workload (ACWR) ratio is used to monitor an athlete's preparedness for competition and to assess injury risks. The aim of this study was to investigate whether acute and chronic workload calculations for external and internal loads (e.g. high-speed work distance and associated exertional effort) were...article 2020
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Elgammi, M. (author), Schepers, J.G. (author), Osta-Omar, S. (author)Horizontal axis wind turbines (HAWTs) experience three-dimensional rotational and unsteady aerodynamic phenomena at the rotor blades sections. These highly unsteady three-dimensional effects have a dramatic impact on the aerodynamic load distributions on the blades, in particular, when they occur at high angles of attack due to stall delay and...article 2020
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Leonetti, D. (author), Maljaars, J. (author), Snijder, H.H. (author)This paper presents a probabilistic fatigue life prediction model for welded details subjected to variable amplitude random loading, using the nominal stress approach. The proposed model makes use of CA S-N curves in combination with the relative damage rule which allows to globally account for load interaction effects, and the damage limit...article 2020
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Koopman, A.S. (author), Kingma, I. (author), de Looze, M.P. (author), van Dieën, J.H. (author)Low-back pain is the number one cause of disability in the world, with mechanical loading as one of the major risk factors. Exoskeletons have been introduced in the workplace to reduce low back loading. During static forward bending, exoskeletons have been shown to reduce back muscle activity by 10% to 40%. However, effects during dynamic...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