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Yepes Julia, C. (author), van Schelven, R.M. (author), Cavallo, D. (author), Gandini, E. (author), Monni, Stefania (author), Van Vliet, Frank E. (author)Antenna arrays located on airplanes or other mobile platforms for satellite communication applications are typically required to support very large scan angles (close to end-_re). How- ever, planar antenna arrays are typically characterized by scan loss. To increase the scan range conformal arrays and multi-panel configuration can be found in...abstract 2019
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Yepes Julia, C. (author), Gandini, E. (author), Monni, Stefania (author), Van Vliet, Frank E. (author), Neto, A. (author), Cavallo, D. (author)We propose a systematic approach to describe planar slot antennas, embedded in generic stratified media. An equivalent transmission line model for the slot is proposed, based on a spectral domain analysis. First, we introduce a method of moments solution to model semi-infinite slots, fed by a deltagap excitation. The solution entails only two...abstract 2019
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Yepes Julia, C. (author), Gandini, Erio (author), Monni, Stefania (author), Van Vliet, Frank E. (author), Neto, A. (author), Cavallo, D. (author)In this work, antenna arrays with tilted dipoles are investigated in terms of radiation and impedance properties. A spectral method of moments (MoM) was developed for the analysis of doubly-periodic arrays (i.e. periodic in both x and ydirections)<br/>with arbitrarily tilted dipole elements, in free space or in the presence of a backing...conference paper 2019
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Yepes Julia, C. (author), Neto, A. (author), Cavallo, D. (author), Gandini, E (author), Van Vliet, Frank E. (author), Monni, Stefania (author)We present the design of an array of tilted dipoles loaded with artificial dielectrics, to achieve asymmetric radiation patterns. First, a simplified array element consisting of skewed stacked dipoles in the presence of a backing reflector is studied, by means of a dedicated spectral periodic method of moments (MoM). The analysis of the stacked...conference paper 2019
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Frieler, Katja (author), Lange, Stefan (author), Piontek, Franziska (author), Reyer, Christopher P.O. (author), Schewe, Jacob (author), Warszawski, Lila (author), Zhao, Fang (author), Chini, Louise (author), Denvil, Sebastien (author), Emanuel, Kerry (author), Geiger, Tobias (author), Halladay, Kate (author), Hurtt, George (author), Mengel, Matthias (author), Murakami, Daisgbre (author), Ostberg, Sebastian (author), Popp, Alexander (author), Riva, R.E.M. (author), Stevanovic, Miodrag (author), SuzGBRi, Tatsuo (author), Volkholz, Jan (author), Burke, Eleanor (author), Ciais, Philippe (author), Ebi, Kristie (author), Eddy, Tyler D. (author), Elliott, Joshua (author), Galbraith, Eric (author), Gosling, Simon N. (author), Hattermann, Fred (author), Hickler, Thomas (author), Hinkel, Jochen (author), Hof, Christian (author), Huber, Veronika (author), Jägermeyr, Jonas (author), Krysanova, Valentina (author), Marcé, Rafael (author), Müller Schmied, Hannes (author), Mouratiadou, Ioanna (author), Pierson, Don (author), Tittensor, Derek P. (author), Vautard, Robert (author), Van Vliet, Michelle (author), Biber, Matthias F. (author), Betts, Richard A. (author), Leon Bodirsky, Benjamin (author), Deryng, Delphine (author), Frolking, Steve (author), Jones, Chris D. (author), Lotze, Heike K. (author), Lotze-Campen, Hermann (author), Sahajpal, Ritvik (author), Thonicke, Kirsten (author), Tian, Hanqin (author), Yamagata, Yoshiki (author)In Paris, France, December 2015, the Conference of the Parties (COP) to the United Nations Framework Convention on Climate Change (UNFCCC) invited the Intergovernmental Panel on Climate Change (IPCC) to provide a <q>special report in 2018 on the impacts of global warming of 1.5 °C above pre-industrial levels and related global...journal article 2017
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Li, Z. (author), Van Vliet, L.J. (author), Stoker, J. (author), Vos, F.M. (author)Image registration of medical images in the presence of large intra-image signal fluctuations is a challenging task. Our paper addresses this problem by introducing a new concept based on the structure tensor of the local phase. The local phase is calculated from the monogenic signal representation of the images. The local phase image is hardly...conference paper 2015
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Erkens, S.M.J.G. (author), Van Vliet, D. (author), Stigter, J. (author), Mookhoek, S.D. (author), Sluer, B. (author), Khedoe, R. (author), Van de Wall, A. (author), De Bondt, A.H. (author)In 2008 Europe introduced the CEN standards for Asphalt Concrete. The Netherlands adopted the approach of functional requirements, rather than empirical, recipe based requirement. The experiences since 2008 showed that, although this approach allows for a better, more fundamental understanding of Asphalt Concrete, the current understanding is...conference paper 2015
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Shakeri, S.M. (author), Hulsken, B. (author), Van Vliet, L.J. (author), Stallinga, S. (author)Whole Slide Imaging (WSI) systems are used in the emerging field of digital pathology for capturing high-resolution images of tissue slides at high throughput. We present a technique to measure the optical aberrations of WSI systems using a Shack-Hartmann wavefront sensor as a function of field position. The resulting full-field aberration maps...conference paper 2015
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Righolt, C.H. (author), Guffei, A. (author), Knecht, H. (author), Young, I.T. (author), Stallinga, S. (author), Van Vliet, L.J. (author), Mai, S. (author)Advances in light microscopy have enabled the visualization of DNA in the interphase nucleus with more detail than is visible with conventional light microscopy. The nuclear architecture is assumed to be different in cancer cells compared to normal cells. In this paper we have studied, for the first time, the organization of nuclear DNA and that...journal article 2014
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Van Vliet, S. (author), Hol, F.J.H. (author), Weenink, T. (author), Galajda, P. (author), Keymer, J.E. (author)Background Bacterial habitats, such as soil and the gut, are structured at the micrometer scale. Important aspects of microbial life in such spatial ecosystems are migration and colonization. Here we explore the colonization of a structured ecosystem by two neutrally labeled strains of Escherichia coli. Using time-lapse microscopy we studied the...journal article 2014
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Righolt, C.H. (author), Mai, S. (author), Van Vliet, L.J. (author), Stallinga, S. (author)The quality of the reconstructed image in structured illumination microscopy (SIM) depends on various aspects of the image filtering process. To optimize the trade-off between resolution and ringing artifacts, which lead to negative intensities, we extend Lukosz-bound filtering to 3D SIM and derive the parametrization of the 3D SIM cut-off. We...journal article 2014
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Erkens, S.M.J.G. (author), Van Dommelen, A.C. (author), Van Vliet, D. (author), Leegwater, G.A. (author)Het zelfherstellend vermogen, of de healingscapaciteit, van asfaltmengsels wordt in de meeste ontwerpmethoden voor wegverhardingen meegenomen. De kennis over dit zelfherstellend vermogen is gebaseerd op ervaringen en onderzoeken uit het verleden en de werkelijke mechanismen erachter zijn niet bekend. Hierdoor is het moeilijk om voor nieuwe...report 2014
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Righolt, C.H. (author), Slotman, J.A. (author), Young, I.T. (author), Mai, S. (author), Van Vliet, L.J. (author), Stallinga, S. (author)Various aspects of image filtering affect the final image quality in Structured Illumination Microscopy, in particular the regularization parameter and type of regularization function, the relative height of the side bands, and the shape of the apodization function. We propose an apodization filter without adjustable parameters based on the...journal article 2013
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Kostenko, A. (author), Batenburg, K.J. (author), King, A. (author), Offerman, S.E. (author), Van Vliet, L.J. (author)The reconstruction problem in in-line X-ray Phase-Contrast Tomography is usually approached by solving two independent linearized sub-problems: phase retrieval and tomographic reconstruction. Both problems are often ill-posed and require the use of regularization techniques that lead to artifacts in the reconstructed image. We present a novel...journal article 2013
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Kostenko, A. (author), Batenburg, K.J. (author), Suhonen, H. (author), Offerman, S.E. (author), Van Vliet, L.J. (author)State-of-the-art techniques for phase retrieval in propagation based X-ray phase-contrast imaging are aiming to solve an underdetermined linear system of equations. They commonly employ Tikhonov regularization – an L2-norm regularized deconvolution scheme – despite some of its limitations. We present a novel approach to phase retrieval based on...journal article 2013
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Letema, S. (author), Van Vliet, B. (author), Van Lier, J.B. (author)Urbanisation of poverty and informality in East Africa poses a threat to public health and environmental protection, perpetuating social exclusion and inequalities, while it creates service gaps. Neither conventional on-site sanitation nor modern centralised off-site sanitation provisions are tenable citywide, giving rise to the emergence of...conference paper 2012
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Van Vliet, M.H. (author), Horlings, H.M. (author), Van de Vijver, M.J. (author), Reinders, M.J.T. (author), Wessels, L.F.A. (author)Breast cancer outcome can be predicted using models derived from gene expression data or clinical data. Only a few studies have created a single prediction model using both gene expression and clinical data. These studies often remain inconclusive regarding an obtained improvement in prediction performance. We rigorously compare three different...journal article 2012
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Vulovic, M. (author), Franken, E. (author), Ravelli, R.B.G. (author), Van Vliet, L.J. (author), Rieger, B. (author)Defocus and twofold astigmatism are the key parameters governing the contrast transfer function (CTF) in transmission electron microscopy (TEM) of weak phase objects. We present a new algorithm to estimate these aberrations and the associated uncertainties. Tests show very good agreement between simulated and estimated defocus and astigmatism....journal article 2012
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Van Vliet, B. (author), Caarls, W. (author), Schuitema, E. (author), Jonker, P.P. (author)Reinforcement learning is a way to learn control tasks by trial and error. Even for simple motor control tasks, however, this can take a long time. We can speed up learning by using prior knowledge, but this is not always available, especially for an autonomous agent. One way to add limited prior knowledge is to use subgoals, defining points...conference paper 2011
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Letema, S. (author), Van Vliet, B. (author), Van Lier, J.B. (author)Satellite sewage collection and treatment systems have been independently developed and managed in East African cities outside the centrally planned and sewered areas. A satellite approach is a promising provisioning option parallel to public sewerage for middle- and high-income residential areas, endowed institutions, and government facilities....journal article 2011