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Liu, X.X. (author), Hayton, D.J. (author), Luo, Y.C. (author), Wei, L. (author), Vercruyssen, N. (author), Gao, J.R. (author), Groppi, C. (author)We report on realization of a 2 × 2 NbN hot electron bolometer (HEB) array receiver using multiple local oscillator (LO) beams that are obtained from a Fourier phase grating mirror. The grating splits a 1.4 THz single beam into four uniform sub-beams. Two 50mm lenses are applied to collimate each beam in order to achieve a spacing of 12mm...conference paper 2015
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Liu, L. (author), Zlatanova, S. (author)Indoor navigation is gaining an increasing interest among researchers in many domains. In many cases users need to orient quickly in complex environments, which is not always the target of current routing algorithms. The paper reviews current indoor path-finding approaches and discusses some of the limitations. In order to support a natural...conference paper 2011
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- Schlangen, H.E.J.G. (author), Garica, A. (author), Van de Ven, M.F.C. (author), Van Bochove, G. (author), Van Montfort, J. (author), Liu, Q. (author) conference paper 2011
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Liu, Y. (author), Wapenaar, C.P.A. (author), Arntsen, B. (author)The retrieval of the Green's functions between receiver pairs by multi-dimensional deconvolution can be extended to extract the impulse response between source pairs through source-receiver reciprocity. However in general, the procedure requires the separation of the outgoing and incoming wavefields at the sources, which reduces to the...conference paper 2014
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Liu, X. (author), Tzimiris, G. (author), Li, J. (author), Scarpas, T. (author), Hofman, R. (author), Voskuilen, J. (author)In order to adequately characterize the fatigue response of the various membranes with surrounding multilayer surfacing layers on orthotropic steel decks and collect the necessary parameters for FE modeling, the details of the cyclic Membrane Adhesion Tester (MAT) are introduced. The fatigue damage in membrane interface is related to the amount...conference paper 2015
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- Hashemifarahani, H. (author), Ditmar, P.G. (author), Inacio, P.M.G. (author), Klees, R. (author), Guo, J. (author), Guo, X. (author), Liu, X. (author), Zhao, Q. (author), Didova, O. (author), Ran, J. (author), Sun, Y. (author), Tangdamrongsub, N. (author), Gunter, B.C. (author), Riva, R.E.M. (author), Steele-Dunne, S.C. (author) conference paper 2014
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Kostopoulos, D. (author), Liu, D. (author), Genani, G. (author), Polinder, H. (author)Offshore wind is considered a vital component of the future large scale renewable generation portfolio. Intense R&D effort is occurring in both the technology and the supply chain aiming at cost reduction. The drivetrain of wind turbines is an area of continuous evolution with currently no one standard configuration in the industry. It is...conference paper 2013
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Chen, X. (author), Liu, X. (author), Qian, Z. (author), Lei, Z. (author)Reliable and durable asphalt surfacing systems still remain to be desired for the long-spanned orthotropic steel bridges as the nationally and internationally reports on distresses in deck pavement. Based on ten-year research works, this paper has presented a brief review and discussion of the Chinese practices and experiences of deck pavement...conference paper 2012
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Liu, X. (author), Markine, V.L. (author), Shevtsov, I. (author)This paper presented the performance study of two frogs in a double crossover in the railway network in the Netherlands. These frogs are located on the same track line. Each train passes through Frog 1 in the facing direction and Frog 2 in the trailing direction. Both frogs are monitored with ESAH-M crossing dynamic behaviour measurement tool...conference paper 2015
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- Tao, Y. (author), Gao, D.W. (author), Wang, H.Y. (author), Zhang, X. (author), Ghasimi, S.M.D. (author), Ozgun, H. (author), Ersahin, M.E. (author), Zhou, Z.B. (author), Liu, G. (author), Temudo, M.F. (author), Kloek, J. (author), Spanjers, H. (author), De Kreuk, M.K. (author), Van Lier, J.B. (author) conference paper 2014
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Lindenbergh, R.C. (author), Liu, S. (author), Hanssen, R. (author), De Haan, S. (author), Van der Marel, H. (author)High spatial resolution integrated water vapor (IWV) estimates are available from the MERIS spectrometer on board of Envisat. Unfortunately cloud cover results in loss of a large amount of MERIS IWV pixels. Here methods are presented for filling cloud gaps in MERIS IWV scenes, first, by directly interpolating remaining pixels not affected by...conference paper 2009
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Tzimiris, G. (author), Liu, X. (author), Scarpas, A. (author), Li, J. (author), Hofman, R. (author), Voskuilen, J. (author)Due to lightweight and flexibility, orthotropic steel deck bridges become popular the last decades but several problems were reported in relation to asphalt surfacing materials such as rutting, cracking, loss of bond between the surfacing system and steel deck. In the Netherlands a surfacing structure for orthotropic steel bridge decks mostly...conference paper 2013
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Liu, X. (author), Markine, V.L. (author), Shevtsov, I. (author), Dollevoet, R.P.B.J. (author)The continuous increasing demand of public transportation capacity requires the railway network operating in tight schedule. The high transporting volumes not only aggravate the degradation of railway infrastructure but also shorten the time for maintenance. Well-arranged infrastructure maintenance contributes to the budget reduction and...conference paper 2015
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Liu, W. (author), Stappers, P.J. (author), Pasman, G.J. (author), Van der Helm, A.J.C. (author), Aprile, W.A. (author), Keller, I. (author)This study aimed to explore ways of user inputs through designing interactive game controllers with different type of sensor. From building four experiential prototypes on Pong, we learned to drive design by focusing on interaction qualities, which determine the use of sensors. We found that the interaction qualities together as a set offer a...conference paper 2012
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Liu, Y. (author), Wapenaar, C.P.A. (author), Romdhane, A. (author)Seismic interferometry (SI) is usually implemented by crosscorrelation (CC) to retrieve the impulse response between pairs of receiver positions. An alternative approach by multidimensional deconvolution (MDD) has been developed and shown in various studies the potential to suppress artifacts due to irregular source distribution and intrinsic...conference paper 2014
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Chen, Y.C. (author), Liu, W. (author)The interactions in IT supported activities in a Generation Y work context were studied and discussed, which general design guidelines have een revealed. However, further research about practical design guidelines hasn’t been performed. This study aims to serve as supplement of this part based on previous research. By applying contextual...conference paper 2012
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- Li, K. (author), Liu, W. (author), Markine, V.L. (author), Ma, L. (author) conference paper 2012
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Luo, Y.C. (author), Liu, X.X. (author), Hayton, D.J. (author), Wei, L. (author), Gao, J.R. (author), Groppi, C. (author)A Fourier phase grating mirror will be applied to split a single, coherent terahertz source beam into multi-beams, which are spatially distributed as required for the local oscillator in an array receiver. We report on the simulation, design and fabrication of a Fourier phase grating at 1.25 THz for generating 2×2 beams, and the measurements at...conference paper 2015
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Dingemans, L.M. (author), Papadakis, V. (author), Liu, P. (author), Adam, A.J.L. (author), Groves, R.M. (author)Optical coherence tomography (OCT) is a contactless and non-destructive testing (NDT) technique based on lowcoherence interferometry. It has recently become a popular NDT-tool for evaluating cultural heritage. In this study, protective coatings on wood and their penetration into the wood structure were measured with a customized infrared fiber...conference paper 2015
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Li, J. (author), Liu, X. (author), Scarpas, A. (author), Tzimiris, G. (author)Light weight orthotropic steel bridge decks have been widely utilized for bridges in seismic zones, movable bridges and long span bridges. In the last three decades, severe problems were reported in relation to asphaltic surfacing materials on orthotropic steel deck bridges. Earlier investigations have shown that the bonding strength of membrane...conference paper 2013