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Sartini, Ludovica (author), Antonini, A. (author)The accurate description of wave climate at different spatio-temporal scales requires the application of advanced statistical models together with a good knowledge of geophysical processes. Furthermore, accurate modelling of multimodal sea states is of primary importance for most of offshore and coastal activities, such as wave energy device...journal article 2024
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Skandali, D. (author), Lourens, E. (author), Ogink, R.H.M. (author)A vessel's response to waves is dependent on a large number of parameters, some of which are both frequency and direction dependent. To predict vessel response, these parameters are used to construct response amplitude operators (RAOs) that act as transfer functions between the directional wave spectra and the motion spectra of the vessel. In...journal article 2020
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Ren, Y. (author), Hayton, D.J. (author), Hovenier, J.N. (author), Cui, M. (author), Gao, J.R. (author), Klapwijk, T.M. (author), Shi, S.C. (author), Kao, T.Y. (author), Hu, Q. (author), Reno, J.L. (author)We demonstrate an experimental scheme to simultaneously stabilize the frequency and amplitude of a 3.5 THz third-order distributed feedback quantum cascade laser as a local oscillator. The frequency stabilization has been realized using a methanol absorption line, a power detector, and a proportional-integral-derivative (PID) loop. The amplitude...journal article 2012
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Ramanandan, G.K.P. (author), Ramakrishnan, G. (author), Planken, P.C.M. (author)Terahertz (THz) transmission spectroscopy is used to measure the oxidation kinetics of copper thin films evaporated on silicon substrates. The transmission of broadband THz pulses from 1 to 7 THz through the copper film is measured while it gets oxidized at an elevated temperature in ambient air. The change in the transmitted THz electric field...journal article 2012
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Schins, J.M. (author)The retrieval of the primary (subpicosecond) photoproducts in small-band two-dimensional time-domain terahertz spectroscopy has succeeded only in a few model systems, due to the complicated correlation between the two time parameters. We show that the nature of the primary photoproducts is revealed upon differentiating the measured time-domain...journal article 2010
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Ren, Y. (author), Hovenier, J.N. (author), Higgins, R. (author), Gao, J.R. (author), Klapwijk, T.M. (author), Shi, S.C. (author), Bell, A. (author), Klein, B. (author), Williams, B.S. (author), Kumar, S. (author), Hu, Q. (author), Reno, J.L. (author)A terahertz (THz) heterodyne spectrometer is demonstrated based on a quantum cascade laser (QCL) as a local oscillator (LO) and an NbN hot electron bolometer as a mixer, and it is used to measure high-resolution molecular spectral lines of methanol (CH3OH) between 2.913–2.918 THz. The spectral lines are taken from a gas cell containing methanol...journal article 2010
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Verhagen, H.J. (author), Van Vledder, G.P. (author), Eslami Arab, S. (author)Modern design formula for coastal structures (like rock stability formula and overtopping formula use wave parameters (H2% and Tm-1,0) which are not readily available from standard boundary condition wave data. For transforming values like Hs and Tp to the parameters used in the new formulas, often-fixed conversion factors are used. However,...conference paper 2008
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Schins, J.M. (author), Hendry, E. (author), Bonn, M. (author), Muller, H.G. (author)We present an analytical expression for the observed signal in time- and phase-resolved pump-probe studies, with particular emphasis on terahertz time-domain spectroscopy. Maxwell’s equations are solved for the response of damped, harmonic oscillators to a driving probe field in the perturbative regime. Our analytical expressions agree with the...journal article 2007
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- Groeneweg, J. (author), Dongeren, A.R. van (author) report 2002
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- van Gent, M.R.A. (author) report 2002
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- Eldeberky, Y. (author) doctoral thesis 1996
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- Boogaard, H.F.P. van den (author), Uittenbogaard, R.E. (author), Gerritsen, H. (author) report 1991
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Klopman, G. (author)Bij het bepalen van auto- en kruisspectrale vermogensdichtheidsfunklies (in het vervolg van deze notitie: spectra) van tijdreeksen ult een meetreeks van beperkte duur, onstaat in het algemeen lek van vermogensdichtheid bij een bepaalde frequentie naar andere frequenties. Dit wordt veroorzaakt door het feit, dat als het signaal periodiek wordt...report 1989
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Yamazaki, H. (author), Herbich, J.B. (author)A nonparametric bivariate density estimation technique is developed employing tensor product B-splines to provide a concise wave data summary. Most of the existing nonparametric techniques involve a certain level of subjectivity in the choice of smoothing parameters. A criterion based on the least squares concept is proposed to remove the...report 1985
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Holthuijsen, L.H. (author)The Delft University of Technology and the Ministry of Public Works in the Netherlands jointly developed a system to measure the instantaneous three-dimensional sea surface by means of stereophotography from helicopters. The objective of this report is to describe this system. The system was developed as one of the elements in a study of the...report 1979
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- Ramkema, C. (author) report 1978