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Increasing cheat robustness of crowdsourcing tasks

Eickhoff, C. (author), De Vries, A.P. (author)

Crowdsourcing successfully strives to become a widely used means of collecting large-scale scientific corpora. Many research fields, including Information Retrieval, rely on this novel way of data acquisition. However, it seems to be undermined by a significant share of workers that are primarily interested in producing quick generic answers...

journal article 2012

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A question of stability

Hartmann, L. (author)

It is easy to see whether a system in equilibrium is stable when there are only two forces acting on it, as in a swing. But until recently, this was impossible for an equilibrium involving three forces, as in a hammock. A team of structural engineers at TU Delft have discovered a mathematical method of determining the stability of an equilibrium...

journal article 2006

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Optimization of sandwich composites fuselages under flight loads

Yan, C. (author), Bergsma, O. (author), Koussios, S. (author), Zu, L. (author), Beukers, A. (author)

The sandwich composites fuselages appear to be a promising choice for the future aircrafts because of their structural efficiency and functional integration advantages. However, the design of sandwich composites is more complex than other structures because of many involved variables. In this paper, the fuselage is designed as a sandwich...

journal article 2010

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Observations of barrier island length explained using an exploratory morphodynamic model

Roos, P.C. (author), Schuttelaars, H.M. (author), Brouwer, R.L. (author)

Barrier coasts display a chain of islands, separated by tidal inlets that connect a back-barrier basin to a sea or ocean. Observations show that barrier island length generally decreases for increasing tidal range and increasing basin area. However, this has neither been reproduced in model studies nor explained from the underlying physics. This...

journal article 2013

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Bifurcation dynamics and avulsion duration in meandering rivers by one-dimensional and three-dimensional models

Kleinhans, M.G. (author), Jagers, H.R.A. (author), Mosselman, E. (author), Sloff, C.J. (author)

At river bifurcations, water and sediment are divided over two branches. The dynamics of the bifurcation determine the long-term evolution (centuries) of the downstream branches, potentially leading to avulsion, but the dynamics are poorly understood. The long-term evolution can only be studied by one-dimensional models because of computational...

journal article 2008

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The cessation of continuous turbulence as precursor of the very stable nocturnal boundary layer

Van de Wiel, B.J.H. (author), Moene, A.F. (author), Jonker, H.J.J. (author)

The mechanism behind the collapse of turbulence in the evening as a precursor to the onset of the very stable boundary layer is investigated. To this end a cooled, pressure-driven flow is investigated by means of a local similarity model. Simulations reveal a temporary collapse of turbulence whenever the surface heat extraction, expressed in its...

journal article 2012

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Gravity-driven bubbly flows

Mudde, R.F. (author)

journal article 2005

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Detrainment in deep convection

Böing, S.J. (author), Siebesma, A.P. (author), Korpershoek, J.D. (author), Jonker, H.J.J. (author)

This study explores the mechanisms that determine detrainment in deep cumulus convection. A set of 90 high-resolution Large Eddy Simulations is used to systematically explore the sensitivity of continental deep convection to the relative humidity and stability of the free troposphere. It appears that variations in the mass-flux profiles are...

journal article 2012

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Optimal error estimates of the local discontinuous Galerkin method for surface diffusion of graphs on Cartesian Meshes

Ji, L. (author), Xu, Y. (author)

In (Xu and Shu in J. Sci. Comput. 40:375–390, 2009), a local discontinuous Galerkin (LDG) method for the surface diffusion of graphs was developed and a rigorous proof for its energy stability was given. Numerical simulation results showed the optimal order of accuracy. In this subsequent paper, we concentrate on analyzing a priori error...

journal article 2011

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Bicycles made to measure

Van Dijk, T. (author)

For almost a century and a half, mathematicians have been racking their brains about the bike. How can a rolling bicycle be so stable of its own accord? Delft researchers now say they have completed the model to end all models. Bicycle manufacturer Batavus intends to use it to make better bikes for the elderly and disabled.

journal article 2007

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Stability and accuracy of active shielding for grounded capacitive sensors

Reverter, F. (author), Li, X. (author), Meijer, G.C.M. (author)

journal article 2006

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Fluid mechanical aspects of the gas-lift technique

Guet, S. (author), Ooms, G. (author)

journal article 2006

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Turbulent Winds and Temperature Fronts in Large-Eddy Simulations of the Stable Atmospheric Boundary Layer

Sullivan, P.P. (author), Weil, J.C. (author), Patton, E.G. (author), Jonker, H.J.J. (author), Mironov, D.V. (author)

journal article 2016

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Mechanism of deactivation of Au/Fe2O3 catalysts under water-gas shift conditions

Silberova, B.A.A. (author), Makkee, M. (author), Moulijn, J.A. (author)

journal article 2007

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Quantification of Fractional Dynamical Stability of EEG Signals as a Bio-Marker for Cognitive Motor Control

Reed, Emily A. (author), Bogdan, Paul (author), Gonçalves Melo Pequito, S.D. (author)

Assessing the stability of biological system models has aided in uncovering a plethora of new insights in genetics, neuroscience, and medicine. In this paper, we focus on analyzing the stability of neurological signals, including electroencephalogram (EEG) signals. Interestingly, spatiotemporal discrete-time linear fractional-order systems ...

journal article 2022

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Framework for Studying Stability of Switching Max-Plus Linear Systems

Gupta, A. (author), van den Boom, A.J.J. (author), van der Woude, J.W. (author), De Schutter, B.H.K. (author)

We propose a framework for studying the stability of discrete-event systems modelled as switching max-plus linear systems. In this framework, we propose a set of notions of stability for generic discrete-event systems in the max-plus algebra. Then we show the loss of equivalence of these notions for switching max-plus linear systems due to the...

journal article 2020

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Effects of Substrate and Polymer Encapsulation on CO₂ Electroreduction by Immobilized Indium(III) Protoporphyrin

Birdja, Yuvraj Y. (author), Vos, Rafaël E. (author), Wezendonk, T.A. (author), Jiang, Lin (author), Kapteijn, F. (author), Koper, M.T.M. (author)

Heterogenization of molecular catalysts for CO₂ electroreduction has attracted significant research activity, due to the combined advantages of homogeneous and heterogeneous catalysts. In this work, we demonstrate the strong influence of the nature of the substrate on the selectivity and reactivity of electrocatalytic CO<sub>2</sub...

journal article 2018

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Lysozyme stability in various deep eutectic solvents using molecular dynamics simulations

Hebbar, Akshatha (author), Dey, P. (author), Vatti, Anoop Kishore (author)

The ability of neat deep eutectic solvents (DESs) to influence protein structure and function has gained considerable interest due to the unstable nature of enzymes or therapeutic proteins, which are often exposed to thermal, chemical, or mechanical stresses when handled at an industrial scale. In this study, we simulated a model globular...

journal article 2023

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Directed evolution of unspecific peroxygenase in organic solvents

Martin-Diaz, Javier (author), Molina-Espeja, Patricia (author), Hofrichter, Martin (author), Hollmann, F. (author), Alcalde, Miguel (author)

Fungal unspecific peroxygenases (UPOs) are efficient biocatalysts that insert oxygen atoms into nonactivated C–H bonds with high selectivity. Many oxyfunctionalization reactions catalyzed by UPOs are favored in organic solvents, a milieu in which their enzymatic activity is drastically reduced. Using as departure point the UPO secretion...

journal article 2021

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Induced aseismic slip and the onset of seismicity in displaced faults

Jansen, J.D. (author), Meulenbroek, B.J. (author)

We address aseismic fault slip and the onset of seismicity resulting from depletion-induced or injection-induced stresses in reservoirs with pre-existing vertical or inclined faults. Building on classic results, we discuss semi-analytical modelling techniques for fault slip including dislocation theory, Cauchy-type singular integral equations...

journal article 2022