Collection: research
(1 - 20 of 48,051)

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Diaz Cortes, G.B. (author), Vuik, C. (author), Jansen, J.D. (author)
We study fast and robust iterative solvers for large systems of linear equations resulting from simulation of flow trough strongly heterogeneous porous media. We propose the use of preconditioning and deflation techniques, based on information obtained frfrom the system, to reduce the time spent in the solution of the linear system.An important...
journal article 2018
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Vanham, D. (author), Hoekstra, A (author), Wada, Y (author), Bouraoui, F. (author), de Roo, A. (author), Mekonnen, M. M. (author), van de Bund, W. J. (author), Batelaan, O. (author), Pavelic, P. (author), Bastiaanssen, W.G.M. (author), Kummu, M (author), Rockström, J. (author), Liu, J. (author), Bisselink, B. (author), Ronco, P. (author), Pistocchi, A. (author), Bidoglio, G. (author)

Target 6.4 of the recently adopted Sustainable Development Goals (SDGs) deals with the reduction of water scarcity. To monitor progress towards this target, two indicators are used: Indicator 6.4.1 measuring water use efficiency and 6.4.2 measuring the level of water stress (WS). This paper aims to identify whether the currently proposed...

review 2018
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Limberger, Jon (author), Boxem, Thijs (author), Pluymaekers, Maarten (author), Bruhn, D.F. (author), Manzella, Adele (author), Calcagno, Philippe (author), Beekman, Fred (author), Cloetingh, S.A.P.L. (author), van Wees, Jan Diederik (author)

In this paper we present results of a global resource assessment for geothermal energy within deep aquifers for direct heat utilization. Greenhouse heating, spatial heating, and spatial cooling are considered in this assessment. We derive subsurface temperatures from geophysical data and apply a volumetric heat-in-place method to improve...

review 2018
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Ho Huu, V. (author), Hartjes, S. (author), Visser, H.G. (author), Curran, Ricky (author)

The multi-objective evolutionary algorithm based on decomposition (MOEA/D) has been recognized as a promising method for solving multi-objective optimization problems (MOPs), receiving a lot of attention from researchers in recent years. However, its performance in handling MOPs with complicated Pareto fronts (PFs) is still limited,...

journal article 2018
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Morales Espana, G. (author), Lorca, Álvaro (author), de Weerdt, M.M. (author)

The increasing penetration of uncertain generation such as wind and solar in power systems imposes new challenges to the unit commitment (UC) problem, one of the most critical tasks in power systems operations. The two most common approaches to address these challenges — stochastic and robust optimization — have drawbacks that restrict their...

journal article 2018
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de Jonge, C.J. (author), Kraaikamp, C. (author)

By means of singularisations and insertions in Nakada's α-expansions, which involves the removal of partial quotients 1 while introducing partial quotients with a minus sign, the natural extension of Nakada's continued fraction map Tα is given for (10-2)/3≤α<1. From our construction it follows that Ωα, the domain of the natural extension...

journal article 2018
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Salimi, Negin (author), Rezaei, J. (author)

Since research and development (R&D) is the most critical determinant of the productivity, growth and competitive advantage of firms, measuring R&D performance has become the core of attention of R&D managers, and an extensive body of literature has examined and identified different R&D measurements and determinants of R&D...

journal article 2018
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Viegas Ochoa de Carvalho, Pedro (author), Fernandez Villegas, I. (author), Groves, R.M. (author), Benedictus, R. (author)

One of the advantages of thermoplastic composites relative to their thermoset counterparts is the possibility of assembling components through welding. Ultrasonic welding in particular is very promising for industrialization. However, uncertainty in the fatigue and fracture behaviour of composites is still an obstacle to the full utilisation...

journal article 2018
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Hennink, A. (author), Lathouwers, D. (author)

We present a new discretization of the mono-energetic Fokker–Planck equation. We build on previous work (Kópházi and Lathouwers, 2015) where we devised an angular discretization for the Boltzmann equation, allowing for both heterogeneous and anisotropic angular refinement. The angular discretization is based on a discontinuous finite element...

journal article 2018
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Zhu, S. (author), Pozarlik, Artur (author), Roekaerts, D.J.E.M. (author), Correia Rodrigues, H.R. (author), van der Meer, Theo (author)

In the past 25 years high temperature air combustion (HiTAC) technology has been proved and utilized in industry as a promising way to increase thermal efficiency, create a relatively uniform temperature distribution, and reduce emissions of harmful pollutants such as NOX and CO. However, due to the complexity of fuel-oil...

journal article 2018
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Wang, Y. (author), Makkee, M. (author)

Oxygen defects in reduced ceria are the catalytic sites for the NO reduction into N2 in the Toyota Di-Air DeNOx abatement technology. Traces of NO (several hundred ppm) have to compete with the excess amount of other oxidants, e.g., 5% CO2 and 5% O2, in an exhaust gas of a lean burn (diesel) engine....

journal article 2018
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Khakzad Rostami, N. (author), Landucci, Gabriele (author), Cozzani, Valerio (author), Reniers, G.L.L.M.E. (author), Pasman, HJ (author)
The propagation of fire-induced domino effects in chemical plants largely depends on the primary fire scenario, on separation distances between the units, and on the presence of fire protection barriers. Passive and active safety barriers are widely employed to prevent or delay the initiation or propagation of domino effects. In the present...
journal article 2018
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Wattez, Y.C.M. (author), Tenpierik, M.J. (author), Nijs, L. (author)
Over the last few years, reverberation times and sound pressure levels have been measured in many sports halls. Most of these halls, for instance those made from stony materials, perform as predicted. However, sports halls constructed with profiled perforated steel roof panels have an unexpected very low reverberation time in the 125 and 250 Hz...
journal article 2018
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Ma, Y. (author), Mashal, AA (author), Markine, V.L. (author)
To improve the understanding of dynamic impact in 1:9 crossing panel, which is suffering from rapid surface degradation, detailed modelling and experimental studies are performed. A three-dimensional explicit finite element (FE) model of a wheel rolling over a crossing rail, that has an adaptive mesh refinement procedure coupled with two...
journal article 2018
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Lee, W. (author), Yang, Xiaopeng (author), Jung, Daehan (author), Park, Seikwon (author), Kim, Heeeun (author), You, Heecheon (author)

A revised pilot oxygen mask design was developed for better fit to the Korean Air Force pilots’ faces. The present study compared an existing pilot oxygen mask and a prototype of the revised mask design with 88 Korean Air Force pilots in terms of subjective discomfort, facial contact pressure, and slip distance on the face in high gravity....

journal article 2018
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Venkatesan, P. (author), Sun, Z. (author), Sietsma, J. (author), Yang, Y. (author)

In this manuscript, we demonstrate a room temperature electrochemical process for efficiently recycling NdFeB magnet waste. First, the magnet waste was completely leached with HCl and then, in-situ electrochemical oxidation was performed to selectively oxidize Fe(II) in the leachate to Fe(III). Finally, oxalic acid was added directly to the...

journal article 2018
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Yuan, S. (author), De Schutter, B.H.K. (author), Baldi, S. (author)
In this paper, robust adaptive tracking control schemes for uncertain switched linear systems subject to disturbances are investigated. The robust adaptive control problem requires the design of both adaptive and switching laws. A novel adaptive law is proposed based on an extended leakage approach, which does not require knowledge of the bounds...
journal article 2018
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de Witte, AMH (author), Hoozemans, MJM (author), Berger, MAM (author), van der Slikke, R.M.A. (author), van der Woude, LHV (author), Veeger, H.E.J. (author)

The aim of this study was to develop and describe a wheelchair mobility performance test in wheelchair basketball and to assess its construct validity and reliability. To mimic mobility performance of wheelchair basketball matches in a standardised manner, a test was designed based on observation of wheelchair basketball matches and expert...

journal article 2018
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Sahai, A.K. (author), Snellen, M. (author), Simons, D.G. (author)
This paper presents an approach with which perceived audible differences in aircraft sounds can be quantified and presented in an objective manner. The objective quantification of the subjectively heard audible differences is intended to serve two primary goals. It can firstly enable developers of auralization technology to make the auralized...
journal article 2018
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Avdis, A. (author), Candy, A.S. (author), Hill, J. (author), Kramer, SC (author), Piggott, M.D. (author)
Renewable energy is the cornerstone of preventing dangerous climate change whilst main- taining a robust energy supply. Tidal energy will arguably play a critical role in the renewable energy portfolio as it is both predictable and reliable, and can be put in place across the globe. However, installation may impact the local and regional ecology...
journal article 2018
Collection: research
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