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Gu, Junhong (author), Stumpf, Martin (author), Neto, A. (author), Lager, I.E. (author)A strictly causal numerical study of the pulsed operation of a weakly dispersive, leaky wave (LW) antenna is presented. The intricacies at the forefront of the electromagnetic (EM) field radiated from a gap-fed slot in a perfectly electrically conducting (PEC) sheet are evidenced for the first time. The radical effect of a free-space gap...journal article 2024
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Broeders, Sander (author)The port of Rotterdam is one of the most important ports in Western Europe and via the 'Nieuwe Waterweg' it provides maritime trading between the large hinterland and the rest of the world. To provide port access for the large vessels, the channel and port basins need to be dredged regularly. At the same time, in other locations, sediment is...master thesis 2023
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Ouerghi, Ibrahim (author)The mimetic spectral element method is a relatively young method in numerical solutions of partial differential equations and actions that describe physical systems. Its advantage is that it takes the geometrical structure of the problem into account which guarantees consistency of the numerical scheme and the conservation of relevant quantities...master thesis 2023
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Calegari, Rosa (author)This thesis aims to enhance the understanding of quasicrystal formation by integrating global geometry optimization and atomic simulations using the Oscillating Pair Potential (OPP). Quasicrystals, with non-periodic long-range order and forbidden rotational symmetries, have captivated scientists since their discovery. This research combines the...bachelor thesis 2023
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Lager, I.E. (author), Stumpf, Martin (author), Vandenbosch, Guy A.E. (author), Antonini, Giulio (author)The late-time evaluation of electromagnetic (EM) field quantities yielded by convolution integrals that combine Green's functions available at discrete time samples and strictly causal excitations is critically revisited. A typical situation is used for tracing the causes of the divergent late-time behavior that is often experienced. A...journal article 2022
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Wittekoek, B. (author), Van Eekelen, S. J.M. (author), Terwindt, J. (author), Korff, M. (author), Van Duijnen, P. G. (author), Detert, O. (author), Bezuijen, A. (author)The use of geogrids to anchor Sheet Pile Walls (SPW) is relatively new. A series of small-scale tests was performed to investigate the behaviour of geogrid-Anchored SPWs subjected to strip footing surcharge loading. Particle Image Velocimetry (PIV) techniques were used to measure soil displacement and analyse the global failure mechanism and...journal article 2022
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Kleynen, Wouter (author)A black hole is an object in space where the pull of its gravity is so strong<br/>that no light can escape. This notion gives rise to the phenomenon called<br/>gravitational lensing which is the effect where light is being bent by a massive<br/>object, in our case a black hole. With these two concepts in mind we are<br/>able to formulate the...bachelor thesis 2021
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Nie, Ding (author), Shang, Feng (author), Han, Xun (author)Concrete dams are subjected to soft water penetration of a high water head during their long service lives. Degradation due to calcium leaching will decrease the durability of the concrete and affect dam safety. The long-term performance of concrete dams due to calcium leaching should be evaluated and predicted accurately to complete the...conference paper 2021
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van Westering, W.H.P. (author)The volatility of renewable energy sources pose a significant challenge for Distribution Network Operators (DNOs) as it makes planning and maintaining a reliable electricity grid more complex. An essential tool in dealing with the uncertain behavior of renewable energy resources is the load flow simulation, i.e., the standard electricity network...doctoral thesis 2021
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van Hoogdalem, Carlijn (author)This research investigates if confining rubble stone masonry by timber bands and columns increases resistance against earthquake loads, by performing a number of numerical analyses in the finite element software program Diana. In order to establish a reliable model, the input parameters are investigated by means of a literature study and...master thesis 2021
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Lager, I.E. (author)The critical relevance of ensuring the excitation’s causality in electromagnetic (EM) simulations is validated via theoretical arguments and simulation results. Two families of model pulses with an implicitly causal behavior, namely the windowed-power (WP) and the power-exponential (PE) ones, are elaborately discussed. After introducing their...journal article 2021
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Drougkas, A. (author), Licciardello, L. (author), Rots, J.G. (author), Esposito, R. (author)Induced seismicity due to gas extraction in the province of Groningen in the Netherlands has a noticeable impact on building structures. Historic masonry structures in the area, which are non-engineered and lacking empirical design features often present in traditionally seismic regions, are especially vulnerable to dynamic loading. Compounding...conference paper 2020
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Wortelboer, Timo (author)In applying the level-set method in the context of a finite-element method, errors can be minimized by adjusting the mesh to the shape of the level-set curve. The size of the different types of errors that occur depend on the goodness of fit to the zero levelset curve, the skewness of the triangles and the size of the triangles of the mesh. To...bachelor thesis 2018
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den Bakker, Duncan (author)The theory of active contours is applied to microscopic images of cells. A model is developed that approximates cell borders by dynamic curves. This model is based on gradient vector flow (GVF), an external force that acts on the contours. Both active contours and the GVF force field are defined as functions that minimize certain functionals....bachelor thesis 2018
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Marcus, Pepijn (author)The research objective is to analyze the aerodynamic interaction effects and quantify the performance of over-the-wing propeller systems. To achieve this objective, two wind tunnel experiments have been performed to characterize the most important aerodynamic interaction effects of a single propeller installed over-the-wing. Results feature wing...master thesis 2018
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Khajehzadeh, Arash (author)This project aims to investigate propeller wing interaction of an over the wing (OTW) based distributed propulsion (DP) system with the addition of a secondary wing. This research explored the opportunities that OTW configuration provides to DP concept, such as improving the lifting performance of system by inducing the flow over the upper...master thesis 2018
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de Zwart, Tim (author)As climate change seems to become more and more of a serious issue, a sudden surge of interest in clean and renewable energy sources is inevitable. Ocean Thermal Energy Conversion (OTEC), or the process of harnessing energy from the temperature difference between the warm upper ocean layer and the cold bottom ocean layer, is one of these...master thesis 2017
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Navarro Villagómez, Sebastián (author)New technologies (like 3D printing) and the increasing use of no conventional materials (like Fiber Reinforcement Polymer - FRP) are changing the construction industry. More effective and efficient structures are needed in order to achieve sustainable projects. Steel construction industry is not outside this modifications and advances. To keep...master thesis 2017
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Kootte, Marieke (author)A Regional Climate Model (RCM) is a comprehensive tool to<br/>simulate high-resolution climatic factors. A RCM is driven<br/>by low resolution data obtained from a Global Climate Model<br/>(GCM). In the one-way nested method, is the GCM data fed<br/>into the RCM as a Lateral Boundary Condition (LBC) in certain<br/>updates in time, the boundary...master thesis 2017
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van de Riet, B.A.M. (author)Subsea structures such as pipeline end termination (PLET) structures are currently designed according to the ISO:19901-4 and API RP 2A-WSD design codes by Allseas. It has become interesting to investigate the embedded conservatism in these design codes as not only the increasing demand of installations in larger water depths and/or on poor soil...master thesis 2016