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Kwakernaak, M.C. (author), Koel, Marijn (author), van den Berg, P.M. (author), Kelder, E.M. (author), Jager, W.F. (author)A novel protocol for the synthesis of perylene diimides (PDIs), by reacting perylene dianhydride (PDA) with aliphatic amines is reported. Full conversions were obtained at temperatures between 20 and 60 °C, using DBU as the base in DMF or DMSO. A "green"synthesis of PDIs, that runs at higher temperatures, was developed using K2CO3 in DMSO....journal article 2022
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de Leeuw den Bouter, M.L. (author), van den Berg, P.M. (author), Remis, R.F. (author)In this paper we discuss an imaging method when the object has known support and its spatial Fourier transform is only known on a certain k-space undersampled pattern. The simple conjugate gradient least squares algorithm applied to the corresponding truncated Fourier transform equation produces reconstructions that are basically of a similar...journal article 2021
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van der Neut, J.R. (author), Fokkema, J.T. (author), van den Berg, P.M. (author), Zapf, Michael (author), Ruiter, Nicole V. (author), Taskin, U. (author), van Dongen, K.W.A. (author)Synthetic-aperture (SA) imaging is a popular method to visualize the reflectivity of an object from ultrasonic reflections. The method yields an image of the (volume) contrast in acoustic impedance with respect to the embedding. Typically, constant mass density is assumed in the underlying derivation. Due to the band-limited nature of the...journal article 2019
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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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Li, M. (author), Liang, L. (author), Abubakar, A. (author), Van den Berg, P.M. (author)We introduce a new regularization scheme for multiparameter seismic full-waveform inversion (FWI). Using this scheme, we can constrain spatial variations of parameters which are having a weak sensitivity with the one that having a good sensitivity to the measurement, assuming that these parameters have similarities in their structures. In...journal article 2013
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Wavefield decomposition based on acoustic reciprocity: Theory and applications to marine acquisitionVan Borselen, R.G. (author), Fokkema, J.T. (author), Van den Berg, P.M. (author)In marine seismic acquisition, the free surface generates seismic events in our recorded data that are often categorized as noise because these events do not contain independent information about the subsurface geology. Ghost events are considered as such noise because these events are generated when the energy generated by the seismic source,...journal article 2013
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Haffinger, P. (author), Gisolf, A. (author), Van den Berg, P.M. (author)Full waveform inversion (FWI) has the potential to recover detailed quantitative property models of the subsurface, but the process is computationally expensive. Currently available computer systems do not allow to use the full bandwidth of the acquired seismic data, which effectively reduces the resolution that can be obtained. In this paper,...journal article 2013
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Verbeek, P.W. (author), Van den Berg, P.M. (author)We investigate the possibility of light beams that are both narrow and long range with respect to the wavelength. On the basis of spectral electromagnetic field representations, we have studied the decay of the evanescent waves, and we have obtained some bounds for the width and range of a light beam in the near-field region. The range...journal article 2011
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Abubakar, A. (author), Hu, W. (author), Habashy, T.M. (author), Van den Berg, P.M. (author)We have applied the finite-difference contrast-source inversion (FDCSI) method to seismic full-waveform inversion problems. The FDCSI method is an iterative nonlinear inversion algorithm. However, unlike the nonlinear conjugate gradient method and the Gauss-Newton method, FDCSI does not solve any full forward problem explicitly in each iterative...journal article 2009
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- Abubakar, A. (author), Hu, W. (author), Van Den Berg, P.M. (author), Habashy, T.M. (author) journal article 2008
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- Docter, M.W. (author), Van den Berg, P.M. (author), Alkemade, P.F.A. (author), Kutchoukov, V.G. (author), Piciu, O.M. (author), Bossche, A. (author), Young, I.T. (author), Garini, Y. (author) journal article 2007
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Docter, M.W. (author), Young, I.T. (author), Piciu, O.M. (author), Bossche, A. (author), Alkemade, P.F.A. (author), Van den Berg, P.M. (author), Garini, Y. (author)We present a study on the far-field patterns of light transmitted through sub-wavelength metallic hole-arrays. Spectral imaging measurements are used here on hole arrays for the first time. It provides both spatial and spectral information of the transmission in far-field. The visibility of the images, measured in two illumination modes: Köhler...journal article 2006
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- Abubakar, A. (author), Habashy, T.M. (author), Van Den Berg, P.M. (author), Gisolf, D. (author) journal article 2005
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- Abubakar, A. (author), Van Den Berg, P.M. (author), Habashy, T.M. (author) journal article 2005
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- van den Berg, P.M. (author), Korkmaz, E. (author), Abubakar, A. (author) journal article 2003
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- van den Berg, P.M. (author), Fokkema, J.T. (author) journal article 2003
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- Abubakar, A. (author), van den Berg, P.M. (author), Mallorqui, J.J. (author) journal article 2002
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- de Hoop, A.T. (author), van den Berg, P.M. (author), Remis, R.F. (author) journal article 2002
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- Abubaker, A. (author), Van Den Berg, P.M. (author) journal article 2001
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- Abubakar, A. (author), van den Berg, P.M. (author) journal article 2000