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Drijkoningen, G.G. (author), El Allouche, N. (author), Thorbecke, J.W. (author), Bada, G. (author)
Under certain circumstances, marine streamer data contain nongeometrical shear body wave arrivals that can be used for imaging. These shear waves are generated via an evanescent compressional wave in the water and convert to propagating shear waves at the water bottom. They are called “nongeometrical” because the evanescent part in the water...
journal article 2012
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Soni, A.K. (author), Verschuur, D.J. (author)
For vertical-seismic-profiling (VSP) measurements, the use of blended acquisition, with time-overlapping shot records, can greatly reduce the downtime and, thereby, provide large cost savings. For directly imaging blended VSP measurements, we have used full-wavefield migration (FWM). FWM is an inversion-based imaging scheme that enables us to...
journal article 2015
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Popov, M. (author), Smeets, R.P.P. (author), Van der Sluis, L. (author), De Herdt, H. (author), Declerq, J. (author)
The work presented in this paper deals with the investigation of circuit breaker prestrike effect that occurs during energizing a distribution transformer. An experimental test setup that consists of a supply transformer, a vacuum circuit breaker (VCB), a cable and a test transformer is built, and the prestrikes in the VCB are recorded. The test...
journal article 2009
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Reniers, A.J.H.M. (author), Gallagher, E.L. (author), MacMahan, J.H. (author), Brown, J.A. (author), Van Rooijen, A.A. (author), Van Thiel de Vries, J.S.M. (author), Van Prooijen, B.C. (author)
Novel observations of surface grain-size distributions are used in combination with intra-wave modeling to examine the processes responsible for the sorting of sediment grains on a relatively steep beach (slope?=?1:7.5). The field observations of the mean grain size collected with a digital camera system at consecutive low and high tides for a 2...
journal article 2013
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Skupien, E. (author), Berger, R.J. (author), Santos, V.P. (author), Gascon, J. (author), Makkee, M. (author), Kreutzer, M.T. (author), Kooyman, P.J. (author), Moulijn, J.A. (author), Kapteijn, F. (author)
Benzyl alcohol oxidation was carried out in toluene as solvent, in the presence of the potentially inhibiting oxidation products benzaldehyde and benzoic acid. Benzoic acid, or a product of benzoic acid, is identified to be the inhibiting species. The presence of a basic potassium salt (K2CO3 or KF) suppresses this inhibition, but promotes the...
journal article 2014
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Starmans, M. (author), Verhoeff, L. (author), Van den Heuvel, J.P.A. (author)
Amsterdam Central Station is the second busiest station in The Netherlands. Several bottlenecks in the 125 years old monumental station exist due to present train and pedestrian volumes. Further traffic growth is expected. To understand and quantify the options for redesign, a thorough understanding of the interaction between the core traffic...
journal article 2014
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Apostolou, G. (author), Reinders, A.H.M.E. (author), Verwaal, M. (author)
This article presents a simple comparative model which has been developed for the estimation of the performance of photovoltaic (PV) products' cells in indoor environments. The model predicts the performance of PV solar cells, as a function of the distance from a spectrum of artificial (fluorescent light, halogen light, and light-emitting diodes...
journal article 2016
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Hunziker, J.W. (author), Thorbecke, J.W. (author), Slob, E.C. (author)
We determined that the electromagnetic vertical transverse isotropic response in a layered earth can be obtained by solving two equivalent scalar equations, which were for the vertical electric field and for the vertical magnetic field, involving only a scalar global reflection coefficient. Besides the complete derivation of the full...
journal article 2014
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Minisini, S. (author), Zhebel, E. (author), Kononov, A. (author), Mulder, W.A. (author)
Modeling and imaging techniques for geophysics are extremely demanding in terms of computational resources. Seismic data attempt to resolve smaller scales and deeper targets in increasingly more complex geologic settings. Finite elements enable accurate simulation of time-dependent wave propagation in heterogeneous media. They are more costly...
journal article 2013
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Simons, D.G. (author), Snellen, M. (author), Ainslie, M.A. (author)
Sound backscattered from the seabed has been measured in a 10x10-nmi2 region of the North Sea, characterized by a variety of bottom types, including mud, sand, and gravel. The backscattering strength measurements are made by a forward- looking sonar, operating at 100 kHz and tilted at an angle of 30 from the horizontal. Fifty bottom-grab samples...
journal article 2007
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Moghaddam, P.P. (author), Keers, H. (author), Herrmann, F.J. (author), Mulder, W.A. (author)
Waveform inversion is the method of choice for determining a highly heterogeneous subsurface structure. However, conventional waveform inversion requires that the wavefield for each source is computed separately. This makes it very expensive for realistic 3D seismic surveys. Source-encoding waveform inversion, in which the sources are modeled...
journal article 2013
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Raadgever, G.T. (author), Mostert, E. (author), Van de Giesen, N.C. (author)
In order to deal with complex water management problems, it is increasingly claimed that researchers should collaborate with authorities and other stakeholders. According to the literature, such collaboration can enhance cognitive learning about the issues at stake, but there is little empirical evidence for this. In this paper, we assess...
journal article 2012
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Thorbecke, J.W. (author), Draganov, D. (author)
In passive seismic interferometry, new reflection data can be retrieved by crosscorrelating recorded noise data. The quality of the retrieved reflection data is, among others, dependent on the duration and number of passive sources present during the recording time, the source distribution, and the source strength. To investigate these relations...
journal article 2011
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Zanardo, S. (author), Harman, C.J. (author), Troch, P.A. (author), Rao, P.S.C. (author), Sivapalan, M. (author)
We evaluate the extent to which within-year rainfall variability controls interannual variability of catchment water balance. To this end, we analytically derive the probability density function of the annual Budyko evaporation index, B (i.e., the ratio of annual actual evapotranspiration to annual precipitation), by accounting for the...
journal article 2012
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Grobbe, N. (author), Slob, E.C. (author)
We have developed an analytically based, energy fluxnormalized numerical modeling code (ESSEMOD), capable of modeling the wave propagation of all existing ElectroSeismic and SeismoElectric source-receiver combinations in horizontally layered configurations. We compare the results of several of these modeled source-receiver combinations in a...
journal article 2013
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Bensdorp, S. (author), Petersen, S.A. (author), Van den Berg, P.M. (author), Fokkema, J.T. (author)
Over many years, induction logging systems have been used to create well formation logs. The major drawback for the utilization of these tools is the long simulation time for a single forward computation. We proposed an efficient computational method based on a contrast-type of integral-equation formulation, in which we applied an approximation...
journal article 2014
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Van Lelyveld, W. (author)
When requirements for a new model cannot be met by available modeling software, new software can be developed for a specific model. Methods for the development of both model and software exist, but a method for combined development has not been found. A compatible way of thinking is required to combine modeling and software development into a...
journal article 2010
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Boullenger, B. (author), Verdel, A. (author), Paap, B. (author), Thorbecke, J.W. (author), Draganov, D.S. (author)
Seismic interferometry applied to ambient-noise measurements allows the retrieval of the seismic response between pairs of receivers. We studied ambient-noise seismic interferometry (ANSI) to retrieve time-lapse reflection responses from a reservoir during CO2 geologic sequestration, using the case of the experimental site of Ketzin, Germany. We...
journal article 2015
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Dunn, S.M. (author), McDonnell, J.J. (author), Vaché, K.B. (author)
Estimates of mean residence time (MRT) are increasingly used as simple summary descriptors of the hydrological processes involving storage and mixing of water within catchment systems. Current understanding of the physical controls on MRT remains limited, and various hypotheses have been proposed to explain its variability between catchments. We...
journal article
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Hanse, I. (author), Wikkerink, D.P. (author), Keijzer, R. (author), Dhalle, M. (author), ten Kate, H.H.J. (author), ter Brake, H.J.M. (author)
The magnetic modelling and experimental validation of a superconducting degaussing system for maritime vessels is discussed. Degaussing coils compensate for the distortion in the earths' magnetic field by the magnetized steel hull of a ship, thus rendering it 'invisible' for magnetic field sensors. Whereas typical power requirements with...
journal article 2022
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