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Ganeshpure, D.A. (author), Soeiro, Thiago B. (author), Ghaffarian Niasar, M. (author), Vaessen, P.T.M. (author), Bauer, P. (author)This paper comprehensivelyinvestigates the design trade-offs of a Modular Multilevel Converter (MMC) operations as an Arbitrary Wave shapesGenerator (AWG) to perform High Voltage (HV) dielectric testing of different grid assets. HV AWG applications pose unique operatingconditions to the MMC, which influences the selection of the various...journal article 2021
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Ponzoni, Elisa (author), Nocilla, Alessandra (author), Jommi, C. (author)A recent increase in frequency and severity of exceptional climatic events is of concern for the stability of natural and artificial slopes. These undergo continuous evaporation and infiltration cycles, which change the suction distribution and trigger shrinkage, swelling, cracking, and surfi-cial erosion, overall decreasing the soil strength...journal article 2021
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Barbierato, L. (author), Pons, Enrico (author), Mazza, Andrea (author), Bompard, Ettore Francesco (author), Subramaniam Rajkumar, Vetrivel (author), Palensky, P. (author), Macii, Enrico (author), Bottaccioli, Lorenzo (author), Patti, Edoardo (author)Co-simulation techniques are gaining popularity amongst the power system research community to analyse future scalable Smart Grid solutions. However, complications such as multiple communication protocols, uncertainty in latencies are holding-up the widespread usage of these techniques for power system analysis. These issues are even further...conference paper 2021
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Rooijers, C.T. (author), Karmakar, S. (author), Kusuda, Y. (author), Huijsing, J.H. (author), Makinwa, K.A.A. (author)In chopper amplifiers, the interaction between the input signal and the chopper clock can give rise to intermodulation distortion (IMD). This chopper-induced IMD is mainly due to amplifier delay, which causes large pulses at the output of the amplifier's output chopper. This article proposes the use of a so-called fill-in technique to eliminate...journal article 2021
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Xin, H. (author), Correia, José A.F.O. (author), Veljkovic, M. (author)The assessment of fatigue crack propagation of steel structures is essential and important especially to improve the application of high strength steel in construction. The load ratio R, reflecting mean stress effects, will be changed with crack extension in the steel structures with complicated geometry. In this paper, the Walker equation is...journal article 2021
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Vermeer, Jop (author), Scandolo, L. (author), Eisemann, E. (author)Ambient occlusion (AO) is a popular rendering technique that enhances depth perception and realism by darkening locations that are less exposed to ambient light (e.g., corners and creases). In real-time applications, screen-space variants, relying on the depth buffer, are used due to their high performance and good visual quality. However, these...journal article 2021
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Mendonck, Michiel (author), Aparicio, Sofía (author), Díaz, Cristóbal González (author), Hernández, Margarita G. (author), Caro, Guillermo M.Muñoz (author), Anaya, José Javier (author), Cazaux, S.M. (author)This work studies ultrasonic propagation in liquid and ice water drops. The effect of porosity on attenuation of ultrasonic waves in the drops is also explored. The motivation of this research was the possible application of ultrasonic techniques to the study of interstellar and com-etary ice analogs. These ice analogs, made by vapor...journal article 2021
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Patty, C. H.Lucas (author), Kühn, Jonas G. (author), Lambrev, Petar H. (author), Spadaccia, Stefano (author), Keller, C.U. (author), Mulder, W. (author), Pallichadath, V. (author), Snik, Frans (author), Stam, D.M. (author)Context. Homochirality is a generic and unique property of life on Earth and is considered a universal and agnostic biosignature. Homochirality induces fractional circular polarization in the incident light that it reflects. Because this circularly polarized light can be sensed remotely, it can be one of the most compelling candidate...journal article 2021
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Mohammadi, S. (author), de Vries, Bauke (author), Rafiee, Azarakhsh (author), Esfandiari, Masoud (author), Dias, Eduardo (author)Applying any sustainable intervention in the urban energy system requires fundamental knowledge of the energy demand dynamics. Only when we can predict the users' energy demand at any given time with accuracy, we can redesign the urban energy system. Accordingly, the main objective of this paper is to determine the annual electricity usage of...journal article 2021
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Hinz, J.P. (author), Jaeschke, Andrzej (author), Möller, M. (author), Vuik, Cornelis (author)This paper proposes a shape optimization algorithm based on the principles of Isogeometric Analysis (IGA) in which the parameterization of the geometry enters the problem formulation as an additional PDE-constraint. Inspired by the isoparametric principle of IGA, the parameterization and the governing state equation are treated using the same...journal article 2021
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Kola, I. (author), Tielman, M.L. (author), Jonker, C.M. (author), van Riemsdijk, M.B. (author)Personal assistant agents have been developed to help people in their daily lives with tasks such as agenda management. In order to provide better support, they should not only model the user’s internal aspects, but also their social situation. Current research on social context tackles this by modelling the social aspects of a situation from...conference paper 2021
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van der Stok-Nienhuis, Janneke (author), Kuiper, Elisabeth (author), Beentjes, Tonny (author), Joosten, Ineke (author), van Eijck, L. (author), Zhou, Z. (author), van Bommel, Maarten (author)A rare find of a high-status 17th century oval box, retrieved from a shipwreck, provided a unique opportunity to research the construction and finishing layers of an object that is untouched for 350 years. This case study was used to demonstrate the extent of data that can be gained from analytical techniques prior to conservation. The...journal article 2021
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Alkhafaji, Ali A.R. (author), Sjarif, Nilam Nur Amir (author), Shahidan, M.A (author), Azmi, Nurulhuda Firdaus Mohd (author), Sarkan, Haslina Md (author), Chuprat, Suriayati (author), Khalaf, Osamah Ibrahim (author), Al-Khanak, Ehab Nabiel (author)The most sensitive Arabic text available online is the digital Holy Quran. This sacred Islamic religious book is recited by all Muslims worldwide including non-Arabs as part of their worship needs. Thus, it should be protected from any kind of tampering to keep its invaluable meaning intact. Different characteristics of Arabic letters like the...journal article 2021
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Štumpf, Martin (author), Antonini, Giulio (author), Lager, I.E. (author), Vandenbosch, Guy A.E. (author)Closed-form time-domain (TD) analytical expressions describing the electromagnetic (EM) signal transfer between two vertical dipoles through a thin, highly contrasting layer with combined magneto-dielectric properties are derived via the Cagniard–DeHoop (CdH) technique with the TD saltus-type conditions. The TD EM-field coupling between the...journal article 2021
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Stumpf, Martin (author), Lager, I.E. (author), Antonini, Giulio (author), Vandenbosch, Guy A.E. (author)Pulsed electromagnetic (EM) scattering from a relatively narrow superconducting strip is analyzed with the aid of the EM reciprocity theorem and the Cagniard-DeHoop (CdH) technique. The analysis yields a stable convolution-type equation that is solved using the marching-on-in-time (MOT) technique for coefficients representing the time-domain (TD...conference paper 2021
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Ganeshpure, D.A. (author), Soeiro, Thiago B. (author), Ghaffarian Niasar, M. (author), Vaessen, P.T.M. (author), Bauer, P. (author)This paper analyses different design trade-offs for a Modular Multilevel Converter (MMC)-based Arbitrary Wave shape Generator (AWG) used for High Voltage (HV) testing and certification of grid assets such as transformers, switchgear, and cables. Modulation techniques, number of submodules, output voltage levels, arm inductance, and series...conference paper 2021
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Verbraeck, A.W. (author), Eisemann, E. (author)We present an efficient algorithm for visualizing the effect of black holes on its distant surroundings as seen from an observer nearby in orbit. Our solution is GPU-based and builds upon a two-step approach, where we first derive an adaptive grid to map the 360-view around the observer to the distorted celestial sky, which can be directly...journal article 2021
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Doulabian, Shahab (author), Ghasemi Tousi, Erfan (author), Aghlmand, Reza (author), Alizadeh, Babak (author), Ghaderi Bafti, Alireza (author), Abbasi, A. (author)Rainwater harvesting (RWH) has been recognized as one of the most reliable and efficient methods for water supply, especially in arid and semi-arid regions (ASARs) facing freshwater scarcity. Nevertheless, due to the inherent uncertainty of input data and subjectivity involved in the selection of influential parameters, the identification of...journal article 2021
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Degenhardt, Richard (author), Franzoni, Felipe (author), Castro, Saullo G.P. (author)For most structural parts of real launcher structures buckling is the critical design criterion. Due to the high imperfection sensitivity of these structures and to the unknown geometric imperfections during the design phase, it is still today a challenge to predict a reliable design buckling load and to experimentally and non-destructively...conference paper 2021
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Poplin, Alenka (author), de Andrade, Bruno (author), Mahmud, Shoaib (author)This paper explores tangible and intangible characteristics of places. It concentrates on gathering characteristics, emotions, memories and stories related to self-selected evocative places in a city. Evocative places are defined as places that evoke images, memories or emotions. There are two goals identified for this article. The first goal is...book chapter 2021