Collection: research
(41 - 60 of 49,587)

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van der Kruk, E. (author)
Speed skating is a rather special form of locomotion. While in most types of human locomotion, humans generate forces by pushing against the environment in the opposite direction of motion, in speed skating the skater pushes sideward to propel himself forward; Insight in the details of the technique can help a speed skater improve his...
doctoral thesis 2018
document
Snellen, M. (author), Gaida, T.C. (author), Koop, L. (author), Alevizos, Evangelos (author), Simons, D.G. (author)
Obtaining an overview of the spatial and temporal distribution of seabed sediments is of high interest for multiple research disciplines. Multibeam echosounders allow for the mapping of seabed sediments with high area coverage. In this paper, the repeatability of acoustic classification derived from multibeam echosounder backscatter is addressed...
journal article 2018
document
Hardon, S.F. (author), Horeman, T. (author), Bonjer, H. Jaap (author), Meijerink, W. J H Jeroen (author)

Background: Within minimally invasive surgery (MIS), structural implementation of courses and structured assessment of skills are challenged by availability of trainers, time, and money. We aimed to establish and validate an objective measurement tool for preclinical skills acquisition in a basic laparoscopic at-home training program. Methods...

journal article 2018
document
Hilgersom, K.P. (author), Zijlema, M. (author), van de Giesen, N.C. (author)
The three-dimensional (3-D) modelling of water systems involving double-diffusive processes is challenging due to the large computation times required to solve the flow and transport of constituents. In 3-D systems that approach axisymmetry around a central location, computation times can be reduced by applying a 2-D axisymmetric model set-up....
journal article 2018
document
Tajalizadehkhoob, S. (author)
In theory, hosting providers can play an important role in fighting cybercrime and misuse. This is because many online threats, be they high-profile or mundane, use online storage infrastructure maintained by hosting providers at the core of their criminal operations.
However, in practice, we see large differences in the security measures...
doctoral thesis 2018
document
Rezvani, Z. (author)
The purpose of this study was to explore the role of middle management in safety within hazardous industries such as the oil and gas industries. In so doing, the study has answered the main research question, what are the roles and responsibilities of middle managers in risk management and safety oriented decision-making? To achieve the...
doctoral thesis 2018
document
Sun, S. (author)
The inverse scattering problem is inherently nonlinear and improperly posed. Relevant study, such as the existence and uniqueness of the solution, the completeness of the far field pattern, etc., involves an abstruse mathematical theory. In our daily life, the inversion techniques play a significant role in areas such as radar, sonar,...
doctoral thesis 2018
document
Janeiro Lopes Da Silva, J. (author)
The increasing development of information and communication technology is causing fundamental changes to today’s society, changing the communication and interaction of people in their daily lives. For example, geographical distributed co-workers experience collaboration using a broad spectrum of shared workspace systems for communication and...
doctoral thesis 2018
document
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
document
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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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
document
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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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
document
Lago Garcia, J. (author), De Ridder, Fjo (author), Vrancx, Peter (author), De Schutter, B.H.K. (author)

Motivated by the increasing integration among electricity markets, in this paper we propose two different methods to incorporate market integration in electricity price forecasting and to improve the predictive performance. First, we propose a deep neural network that considers features from connected markets to improve the predictive...

journal article 2018
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Peeters, D.M.J. (author), Lozano, Gustavo Gonzalez (author), Abdalla, M.M. (author)

A method to optimise the fibre angle distribution of variable stiffness laminates is proposed. The proposed method integrates a fibre angle retrieval step with a fibre angle optimisation procedure. A multi-level approximation approach is used in combination with the method of successive approximations. First, fibre angle retrieval is done by...

journal article 2018
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Spronk, S.W.F. (author), Kersemans, M. (author), Gilabert, F. A. (author), Sevenois, R.D.B. (author), Garoz, D. (author), Kassapoglou, C. (author), Van Paepegem, W. (author)

The results of a low-velocity impact programme on both carbon/epoxy and glass/polyamide-6 composite laminates are compared to the results of quasi-static indentation. Cross-ply and quasi-isotropic stacking sequences are impacted and quasi-static indentation tests are performed up to the same maximum displacement. The response of the laminates...

journal article 2018
document
Huisman, B.J.A. (author), Ruessink, B. G. (author), de Schipper, M.A. (author), Luijendijk, A.P. (author), Stive, M.J.F. (author)

Large perturbations in the coastline, such as the 'Sand Motor' nourishment (∼21 million m3) at the Holland coast, can initiate considerable spatial and temporal changes in the median grain size (D50) of the sea bed on the lower shoreface. The relevance of hydrodynamic conditions for the development of the heterogeneity...

journal article 2018
document
Frederikse, T. (author), Jevrejeva, Svetlana (author), Riva, R.E.M. (author), Dangendorf, Sönke (author)

Different sea level reconstructions show a spread in sea level rise over the last six decades and it is not yet certain whether the sum of contributors explains the reconstructed rise. Possible causes for this spread are, among others, vertical land motion at tide-gauge locations and the sparse sampling of the spatially variable ocean. To...

journal article 2018
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Zuiderwijk-van Eijk, AMG (author), Shinde, R. (author), Janssen, M.F.W.H.A. (author)
The objectives of open government data initiatives range from enhancing transparency and accountability to increasing innovation and participation. However, there is a lack of knowledge of the extent to which the objectives of open government data initiatives are achieved. This article investigates the relationship between the objectives of open...
journal article 2018
document
Ho Huu, V. (author), Hartjes, S. (author), Visser, H.G. (author), Curran, R. (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
Collection: research
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