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- Vissinga, M. (author), Van den Berg, P.M. (author), Fokkema, J.T. (author) conference paper 1990
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- Van Borselen, R.G. (author), Thorbecke, J. (author), Fokkema, J.T. (author), Van den Berg, P.M. (author) conference paper 1991
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Bozdag, V.E. (author), Timmermans, J.F.C. (author)Cloud services such as Facebook and Google search started to use personalization algorithms in order to deal with growing amount of data online. This is often done in order to reduce the “information overload”. User’s interaction with the system is recorded in a single identity, and the information is personalized for the user using this...conference paper 2001
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Bosma, C. (author), Verhagen, H.J. (author), D'Angremond, K. (author), Sint Nicolaas, W. (author)The paper describes the use of two fundamental design parameters, the void porosity and layer thickness in rock armour constructions. These design parameters are very sensible for factors such as the boundary definition of a rock layer, rock production properties, intrinsic properties and construction properties. Differences in the value of the...conference paper 2002
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Geurts, B.J. (author)Non-uniform filtering of the Navier-Stokes equations expresses itself, next to the turbulent stresses, in additional closure terms known as commutator errors. These terms require explicit subgrid modeling if the non-uniformity of the filter is sufficiently pronounced. We derive expressions for the magnitude of the mean flux, the turbulent stress...conference paper 2006
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Moon, Y.J. (author), Bae, Y.M. (author), Cho, M.H. (author)In the present study, aerodynamic noise from a forward-facing step is numerically investigated for Reynolds number based on the step height, Reh=8,000 and flow Mach number, M=0.03. A three-dimensional flow over the forward-facing step is calculated by the incompressible large eddy simulation (LES), while its acoustic field is solved by the...conference paper 2006
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Brandt, T.T. (author)In large eddy simulations (LES) using low-order finite-difference-type methods, the numerical error can be large in comparison to the effect of the sub-grid scale (SGS) model. In this paper, we study two approaches to explicit filtering which can reduce the numerical error involved. In the first approach, the non-linear convection term of the...conference paper 2006
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De Wilde, J. (author)To account for meso-scale phenomena in coarse grid simulations, correlation terms appearing in the filtered gas-solid flow equations have to be modeled. Filtered models for the gas-solid momentum transfer are focused on. The latter consists of the drag force on the one hand and the distribution of the gas phase pressure gradient over the phases...conference paper 2006
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De Wilde, J. (author), Baudrez, E. (author), Heynderickx, G. (author), Marin, G.B. (author)Local preconditioning for Eulerian-Eulerian gas-solid flow calculations with variable gas density is investigated. The performance of simultaneous solution algorithms for low-Mach calculations is strongly related to preconditioning. The gas-solid drag source terms are at the origin of a solid volume fraction and frequency dependency of the...conference paper 2006
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- Rugini, L. (author), Leus, G. (author) conference paper 2007
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Abd Rahman, M.Z. (author), Gorte, B.G.H. (author)A high resolution Airborne LiDAR data creates better opportunity for an individual tree measurement and provides valuable results for more precise forest inventory. This paper presents tree filtering approach that able to separate dominant tree and undergrowth vegetation. The results can be used for a detailed individual tree measurement. This...conference paper 2008
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Emadi, A. (author), Wu, H. (author), De Graaf, G. (author), Wolffenbuttel, R.F. (author)This paper reports on a CMOS-Compatible Linear Variable Optical Filter (LVOF) visible micro-spectrometer. The CMOS-compatible post process for fabrication of the LVOF has been used for integration of the LVOF with a CMOS chip containing a 128-element photodiode array and readout circuitry. Fabrication of LVOF involves a process for fabrication...conference paper 2010
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Emadi, A. (author), Grabarnik, S. (author), Wu, H. (author), De Graaf, G. (author), Hedsten, K. (author), Enoksson, P. (author), Correia, J.H. (author), Wolffenbuttel, R.F. (author)This paper reports on the functional and spectral characterization of a microspectrometer based on a CMOS detector array covered by an IC-Compatible Linear Variable Optical Filter (LVOF). The Fabry-Perot LVOF is composed of 15 dielectric layers with a tapered middle cavity layer, which has been fabricated in an IC-Compatible process using resist...conference paper 2010
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Fraanje, R. (author), Doelman, N. (author)In recent years various researchers have proposed an optimal control approach for the rejection of turbulence-induced wavefront distortions in an AO system. The essential element in the design of an optimal controller is the choice for the turbulence model, which predicts the turbulence to compensate for the inherent delay in the AO control loop...conference paper 2010
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Cornelissen, H.J. (author), Ho, C. (author), Ma, H. (author), Krijn, M.P.C.M. (author), Van Sprang, H.A. (author)A new method using a thin-film multilayer filter is described to couple light from high-power LEDs into a thin light guide such as an LCD backlight. Light emitted below the critical angle is reflected back to the LED and recycled. Largeangle emitted light passes the filter and is transported by total internal reflection in the light guide. The...conference paper 2010
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Doulgeris, P. (author), Mahdad, A. (author), Blacquière Gerrit, G. (author)n conventional marine acquisition surveys the time intervals between the firing of successive sources are large enough to avoid interference in time. To obtain an efficient survey, the spatial source sampling is therefore often (too) large. How- ever, much attention has been drawn recently to blended ac- quisition designs, where sources are shot...conference paper 2011
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Cornelissen, H.J. (author), Ma, H. (author), Ho, C. (author), Li, M. (author), Mu, C. (author)A novel method is presented to inject the light of millimeter-sized high-brightness blue LEDs into light guides of submillimeter thickness. Use is made of an interference filter that is designed to pass only those modes that will propagate in the light guide by total internal reflection. Other modes are reflected back to the LED cavity and...conference paper 2011
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De Sonneville, B. (author), Van Velzen, G. (author), Verheij, H.J. (author), Dorst, K. (author)Traditional guidelines on rock protection at circular piers predominantly focus on preventing shear failure (by choosing a sufficiently large rock size), winnowing failure (by designing an appropriate filter) and edge failure (by selecting a sufficient extent). In particular areas (e.g. in an eroding river channel or in an area with large-scale...conference paper 2012
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Verheij, H.J. (author), Hoffmans, G. (author), Dorst, K. (author), Van de Sande, S. (author)Granular filters are used for protection of structures against scour and erosion. For a proper functioning it is necessary that the interfaces between the filter structure, the subsoil and the water flowing above the filter structure are stable. Stability means that there is no transport of subsoil material through the filter to the water above...conference paper 2012
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Allouche, N. (author), Simons, D.G. (author), Rietveld, L.C. (author)A novel instrument is developed to acoustically image sand filters used for water treatment and monitor their performance. The instrument consists of an omnidirectional transmitter that generates a chirp with a frequency range between 10 and 110 kHz, and an array of hydrophones. The instrument was extensively tested in a lab before being...conference paper 2012