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Graas, Adriaan B.M. (author), Wagner, E.C. (author), van Leeuwen, Tristan (author), van Ommen, J.R. (author), Batenburg, K. Joost (author), Lucka, Felix (author), Portela, L. (author)A new X-ray computed tomography technique for the purpose of imaging fluidized beds is presented. It consists of an experimental set-up with three stationary X-ray source and flat panel detector pairs, a geometric calibration and data processing workflow, and an image reconstruction algorithm. The technique enables sparse-angular tomographic...journal article 2024
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Kamphorst, R. (author), van der Sande, P.C. (author), Wu, K. (author), Wagner, E.C. (author), David, M.K. (author), Meesters, G.M.H. (author), van Ommen, J.R. (author)Vibro-assisted fluidization of cohesive micro-silica has been studied by means of X-ray imaging, pressure drop measurements, and off-line determination of the agglomerate size. Pressure drop and bed height development could be explained by observable phenomena taking place in the bed; slugging, channeling, fluidization or densification. It...journal article 2024
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van der Sande, P.C. (author), Wagner, E.C. (author), de Mooij, Jack (author), Meesters, G.M.H. (author), van Ommen, J.R. (author)Horizontal stirred bed reactors are widely used in the commercial manufacturing of polypropylene. However, a comprehensive understanding of the particle dynamics in horizontal stirred bed reactors remains elusive, primarily due to the lack of detailed experimental data. In this work, we studied the influence of operating parameters on the...journal article 2024
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Wu, K. (author), Kamphorst, R. (author), Bakker, A.M.T. (author), Ford, Jasper (author), Wagner, E.C. (author), Ochkin-Koenig, Olga (author), Franck, Miika (author), Weis, Dominik (author), Meesters, G.M.H. (author), van Ommen, J.R. (author)Stirring has been recognized in the literature as a promising technique for facilitating fluidization of cohesive powders, via inputting additional energy to counteract interparticle forces. However, the influence of operating conditions and stirrer configurations on flow behavior remains largely unknown, which impedes the practical...journal article 2024
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Shan, X. (author), Steele-Dunne, S.C. (author), Hahn, Sebastian (author), Wagner, Wolfgang (author), Bonan, Bertrand (author), Albergel, Clement (author), Calvet, Jean Christophe (author), Ku, Ou (author)ASCAT normalized backscatter (σ<sub>40</sub><sup>o</sup>) and slope (σ<sup>′</sup>) contain valuable information about soil moisture and vegetation. While σ<sub>40</sub><sup>o</sup> has been assimilated to constrain soil moisture, sometimes together with Leaf Area Index (LAI), this study is the first to assimilate σ<sup>′</sup> directly to...journal article 2024
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- Wagner, Eduard (author), Rukanova, B.D. (author), Bernier, Carolynn (author), Wautelet, Thibaud (author), Ayed, Anne-Christine (author), Böll, Marvin (author), Gayko, Jens (author), Schneider, Andreas (author), Bendzuck, Konrad (author), von Dalwigk, Ilka (author) report 2023
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Wagner, Daniel (author), Ranadive, Sahil Ashish (author), Griffioen, H.J. (author), Kallitsis, Michalis (author), Dainotti, Alberto (author), Smaragdakis, G. (author), Feldmann, Anja (author)Unsolicited traffic sent to advertised network space that does not host active services provides insights about misconfigurations as well as potentially malicious activities, including the spread of Botnets, DDoS campaigns, and exploitation of vulnerabilities. Network telescopes have been used for many years to monitor such unsolicited traffic....conference paper 2023
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Wu, K. (author), Wagner, E.C. (author), Ochkin-Koenig, Olga (author), Franck, Miika (author), Weis, Dominik (author), Meesters, G.M.H. (author), van Ommen, J.R. (author)Mechanical vibration has been broadly used to assist fluidization of cohesive powders, because of its capability to disrupt gas channels and agglomerates. However, the improvement reported in literature is mostly deduced from bulk response and ex-situ measurements, whereas the induced fluidization behavior and underlying physics remain...journal article 2023
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Wagner, Ben (author), de Gooyert, Vincent (author), Veeneman, Wijnand (author)The UN sustainable development goals (SDGs) were adopted by the United Nations as a “universal call to action to end poverty, protect the planet, and ensure that by 2030 all people enjoy peace and prosperity.” These goals prove to have a strong appeal to managers in both public and private sectors. Despite the popularity of the goals, little is...journal article 2023
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Kübler, Johanne (author), Sekwenz, M.T. (author), Rachinger, Felicitas (author), König, Anna (author), Gsenger, Rita (author), Pírková, Eliška (author), Wagner, Ben (author), Kettemann, Matthias C. (author), Krennerich, Michael (author), Ferro, Carolina (author)Safeguarding democratic elections is hard. Social media plays a vital role in the discourse around elections and during electoral campaigns. The following article provides an analysis of the 'systemic electoral risks' created by Twitter and Facebook and the mitigation strategies employed by the platforms. It is based on the 2020 proposal by...conference paper 2023
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Kübler, Johanne (author), Sekwenz, M.T. (author), Rachinger, Felicitas (author), König, Anna (author), Gsenger, Rita (author), Pirkova, Eliska (author), Kettemann, Matthias C. (author), Wagner, Ben (author), Krennerich, Michael (author), Ferro, Carolina (author)Safeguarding democratic elections is hard. Social media plays a vital role in the discourse around elections and during electoral campaigns. The following article provides an analysis of the ‘systemic electoral risks’ created by Twitter and Facebook and the mitigation strategies employed by the platforms. It is based on the 2020 proposal by the...conference paper 2023
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Hanif, Hilmy (author), Constantino Torres, J.E. (author), Sekwenz, M.T. (author), van Eeten, M.J.G. (author), Ubacht, J. (author), Wagner, Ben (author), Zhauniarovich, Y. (author)The AI Act represents a significant legislative effort by the European Union to govern the use of AI systems according to different risk-related classes, linking varying degrees of compliance obligations to the system's classification. However, it is often critiqued due to the lack of general public comprehension and effectiveness regarding...conference paper 2023
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Sigl, Martin (author), Prins, Binnert (author), Schutz, Christoph (author), Wagner, Sebastian (author), Schulte, F. (author), Watzenig, Daniel (author)One of the major challenges in the development of Automated Driving is its assessment. It is expected that Automated Vehicles behave differently than human drivers. Therefore, mixed human-robot traffic will yield different and new driving situations as human-only traffic. It is important to know how this mixed traffic will change the...conference paper 2023
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Singh, M. (author), Amarnath, A. (author), Wagner, Fabian (author), Zhao, Y. (author), Yang, G. (author), Mazzarella, L. (author), Weeber, A.W. (author), Zeman, M. (author), Isabella, O. (author)Single junction crystalline silicon (c-Si) solar cells are reaching their practical efficiency limit whereas perovskite/c-Si tandem solar cells have achieved efficiencies above the theoretical limit of single junction c-Si solar cells. Next to low-thermal budget silicon heterojunction architecture, high-thermal budget carrier-selective...journal article 2023
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Fest, Isabelle (author), Wieringa, Maranke (author), Wagner, Ben (author)Recent years have seen a massive growth in ethical and legal frameworks to govern data science practices. Yet one of the core questions associated with ethical and legal frameworks is the extent to which they are implemented in practice. A particularly interesting case in this context comes to public officials, for whom higher standards...journal article 2022
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- Gsenger, Rita (author), Kübler, Johanne (author), Wagner, Ben (author) book chapter 2022
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- Wagner, Ben (author), Husovec, Martin (author), Kuklis, Lubos (author), Pirkova, Eliska (author) report 2022
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Naapuri, Janne M. (author), Wagner, Philip K. (author), Hollmann, F. (author), Deska, Jan (author)Vanadate-dependent chloroperoxidase from Curvularia inaequalis catalyzes 5-endo-trig bromocyclizations of α-allenols to produce valuable halofunctionalized furans as versatile synthetic building blocks. In contrast to other haloperoxidases, also the more challenging 5-exo-trig halocyclizations of γ-allenols succeed with this system even...journal article 2022
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Wagner, Christian (author), Ferrari, A. (author), Schreuer, Jürgen (author), Couzinié, Jean Philippe (author), Ikeda, Yuji (author), Körmann, F.H.W. (author), Eggeler, Gunther (author), George, Easo P. (author), Laplanche, Guillaume (author)Physical properties of ten single-phase FCC Cr<sub>x</sub>Mn<sub>20</sub>Fe<sub>20</sub>Co<sub>20</sub>Ni<sub>40-</sub><sub>x</sub> high-entropy alloys (HEAs) were investigated for 0 ≤ x ≤ 26 at%. The lattice parameters of these alloys were nearly independent of composition while solidus temperatures increased linearly by ∼30 K as x increased...journal article 2022
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Fest, Isabelle (author), Wieringa, Maranke (author), Wagner, Ben (author)In a collaboration between TU Delft and Utrecht University, the authors recently wrote a qualitative study on the gap between regulatory (ethical and legal) frameworks and the daily practices of data professionals. This People of Data highlights the importance of collaboration in the success of interdisciplinary research and the responsibility...journal article 2022