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Cox, P.B. (author), Coutiño, M.A. (author), van Rossum, W.L. (author)Efficient clutter filtering for pulsed radar systems remains an open issue when employing pulse-to-pulse modulation and irregular pulse interval waveforms within the coherent processing interval. The range and Doppler domain should be jointly processed for effective filtering leading to a large computational overhead. In this paper, the joint...conference paper 2023
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Coutino, M. (author), Uysal, F. (author), Anitori, L. (author)This paper introduces a general framework for waveform-aware optimal window design for mismatch processing. First, the linear relationship between the window function and the output of the mismatch filter, for both frequency and time windowing and a particular waveform, is modeled. Making use of such a relation, typical window constraints are...conference paper 2022
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Derkink, F.M. (author), Doelman, D. (author), van Dam, D. (author), Brenny, B.J.M. (author), Speet, B.G. (author), van Brug, H. (author), Keller, C. (author), Snik, F. (author)While the concentrations of trace gases in Earth’s atmosphere were roughly constant for thousands of years, human activities such as the burning of fossil fuels have caused significant changes ever since the industrial revolution. The remote sensing of trace gases has proved to be a useful technique for mapping and monitoring on the global scale...conference paper 2022
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Struiksma, R.E. (author), Uysal, F. (author), van Rossum, W.L. (author)This paper presents a matched filter which incorporates the time stretching of signals returned from moving targets. This 2D matched filter does not suffer from SNR and resolution degradation due to range migration, and can be used with agile waveforms. The use of this matched filter within the orthogonal matching pursuit (OMP) algorithm, to...conference paper 2022
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ten Brink, H.M. (author), Hitzenberger, R. (author), Virkkula, A. (author)Air pollution by diesel traffic became a concern in the UK in the 1950s. Exposure levels were assessed via probing the light absorption of filter samples, which was translated to a mass concentration of “diesel smoke” (DS), based on the results of a measurements in the exhaust of a test diesel engine. We convert these DS values to concen...article 2022
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Stephan, U. (author), Steinke, O. (author), Ushakov, A. (author), Verlaan, A.L. (author), Yatsuka, E. (author), Yokoyama, M. (author), Rijfers, A. (author), C.A. Ribeiro, D. (author), Moser, L. (author), Bassan, M. (author), Maniscalco, M.P. (author), van Beekum, E.R.J. (author), Hatae, T. (author)The ITER Edge Thomson scattering system provides measurements of the electron temperature and density profiles at the periphery plasma of the ITER tokamak for physics studies and advanced plasma control. The frontend of the system contains a relatively large 23 cm × 25.8 cm metal first mirror (FM). Radio-frequency plasma is considered to remove...article 2022
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van der Vossen, J.M.B.M. (author), Fawzy, A. (author), Ouwens, A.M.T. (author), Doornmalen, J.C.P.M. (author), de Samber, M. (author), Driessens, R. (author), Heerikhuisen, M. (author), Montijn, R.C. (author)Background The global COVID-19 pandemic, accompanied by spikes in the number of patients in hospitals, required substantial amounts of respiratory protective devices (respirators), thereby causing shortages. Disinfection of used respirators by applying ultraviolet C (UVC) light may enable safe reuse, reducing shortages. Aim To determine whether...article 2022
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van der Ploeg, C. (author), Alirezaei, M. (author), van de Wouw, N. (author), Esfahani, P.M. (author)In this article, we propose a tractable nonlinear fault estimation filter along with explicit performance bounds for a class of linear dynamical systems in the presence of both additive and nonlinear multiplicative faults. We consider the case, where both faults may occur simultaneously and through an identical dynamical relationship, a setting...article 2022
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Skoulidou, I (author), Koukouli, M.E. (author), Segers, A.J. (author), Manders-Groot, A.M.M. (author), Balis, D. (author), Stavrakou, T. (author), van Geffen, J. (author), Eskes, H. (author)In this work, we investigate the ability of a data assimilation technique and space-borne observations to quantify and monitor changes in nitrogen oxides (NOx) emissions over North-Western Greece for the summers of 2018 and 2019. In this region, four lignite-burning power plants are located. The data assimilation technique, based on the Ensemble...article 2021
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Lopez-Restrepo, S. (author), Nino-Ruiz, E.D. (author), Guzman-Reyes, L.G. (author), Yarce, A. (author), Quintero, O.L. (author), Pinel, N. (author), Segers, A.J. (author), Heemink, A.W. (author)In this paper, we propose an efficient and practical implementation of the ensemble Kalman filter via shrinkage covariancematrix estimation. Our filter implementation combines information brought by an ensemble of model realizations, and thatbased on our prior knowledge about the dynamical system of interest. We perform the combination of both...article 2021
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Yepes, C. (author), Gandini, E. (author), Monni, S. (author), Neto, A. (author), van Vliet, F.E. (author), Cavallo, D. (author)In this letter, we present a design of a linear array of tilted dipoles to achieve radiation patterns with asymmetric angular filtering characteristics. To realize the asymmetric radiation, the dipole elements are spaced by a distance larger than half a wavelength, thus allowing for grating lobes to occur in the visible region. Moreover, the...article 2020
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de Martin, L. (author), van Rossum, W. (author), Ribeiro, D. (author), Anitori, L. (author)It is well known that noise-like waveforms have the inherent property of suppressing ambiguities due to their nonrepetitive nature, as opposed to the more classical linear frequency modulated (LFM) pulsed waveforms. This aperiodicity also improves the robustness against jammers, making these waveforms harder to detect and classify by an enemy....article 2020
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Keyvani Janbahan, A. (author), van der Veen, G. (author), Tamer, M.S. (author), Sadeghian Marnani, H. (author), Goosen, H. (author), van Keulen, F. (author)The real-time and accurate measurement of tip-sample interaction forces in Tapping Mode Atomic Force Microscopy (TM-AFM) is a remaining challenge. This obstruction fundamentally stems from the causality of the physical systems. Since the input of the dynamic systems propagates to the output with some delay, and multiple different inputs can...article 2020
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Lopez-Restrepo, S. (author), Yarce, A. (author), Pinel, N. (author), Quintero, O.L. (author), Segers, A. (author), Heemink, A.W. (author)A data assimilation system for the LOTOS-EUROS chemical transport model has been implemented to improve the simulation and forecast of PM10 and PM2.5 in a densely populated urban valley of the tropical Andes. The Aburrá Valley in Colombia was used as a case study, given data availability and current environmental issues related to population...article 2020
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Kleinrouweler, J.W. (author), Potetsianakis, E. (author), D'Acunto, L. (author)This paper presents the design and evaluation of a localized crowd-sourced multimedia production and distribution system to enable today's mobile producers of multimedia content to serve their content in real-time to other nearby users, while at the same time drastically reducing the bandwidth as compared to traditional crowd-sourced multimedia...conference paper 2020
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de Boer, M.H.T. (author), Verhoosel, J.P.C. (author)Creating ontologies is an expensive task. Our vision is that we can automatically generate ontologies based on a set of relevant documents to create a kick-start in ontology creating sessions. In this paper, we focus on enhancing two often used methods, OpenIE and cooccurrences. We evaluate the methods on two document sets, one about pizza and...conference paper 2020
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Sweelssen, J. (author), Blokland, H. (author), Rajamaki, T. (author), Boersma, A. (author)Liquid Natural Gas (LNG) is an energy source that is becoming more important in energy transition, as the world is facing lower the CO2 emissions and backup sources for wind and solar energy are needed. LNG is becoming a major player not only as fuel for power plants, but also in transport and mobility. However, the composition of LNG varies...article 2020
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Sweelssen, J. (author), Blokland, H. (author), Rajamäki, T. (author), Sarjonen, R. (author), Boersma, A. (author)The energy market is facing a major transition, in which natural gas and renewable gasses will play an important role. However, changing gas sources and compositions will force the gas transporters, gas engine manufacturers, and gas grid operators to monitor the gas quality in a more intensive way. This leads to the need for lower cost, smaller,...article 2020
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Engels, W.P. (author), van der Hoek, D. (author), Yu, W. (author), Reyes Baez, R. (author)Many wind turbines are still controlled using gain scheduled, PI(D) controllers. Another option is to use a state feedback controller, such as LQG control. However, for wind turbines that is not straight forward solution, because the system is non-linear and the impact of pitching on the states varies in time. This paper presents a variation on...conference paper 2020
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Berzins, J. (author), Fasold, S. (author), Pertsch, T. (author), Bäumer, S.M.B. (author), Setzpfandt, F. (author)Digital color imaging relies on spectral filters on top of a pixelated sensor, such as a CMOS image sensor. An important parameter of imaging devices is their resolution, which depends on the size of the pixels. For many applications, a high resolution is desirable, consequently requiring small spectral filters. Dielectric nanostructures, due to...article 2019