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Grewal, M. (author), Wiersma, Jan (author), Westerveld, Henrike (author), Bosman, P.A.N. (author), Alderliesten, T. (author)Purpose: Deformable image registration (DIR) can benefit from additional guidance using corresponding landmarks in the images. However, the benefits thereof are largely understudied, especially due to the lack of automatic landmark detection methods for three-dimensional (3D) medical images. Approach: We present a deep convolutional neural...journal article 2023
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Wiersma, R.T. (author), Nasikun, A. (author), Eisemann, E. (author), Hildebrandt, K.A. (author)We introduce a geometric multigrid method for solving linear systems arising from variational problems on surfaces in geometry processing, Gravo MG. Our scheme uses point clouds as a reduced representation of the levels of the multigrid hierarchy to achieve a fast hierarchy construction and to extend the applicability of the method from triangle...conference paper 2023
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Tissen, L.N.M. (author), Frequin, Sanne (author), Wiersma, R.T. (author)Cleaning and provisional restoration treatments on The Crucifixion (1425) revealed that the visible azurite layer obscures an originally golden background. This leads to the question of whether or not the azurite should be removed as it is not original, or should be kept as part of the panel’s history. To overcome this dilemma, this paper...journal article 2023
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van Duin, Ron (author), van den Band, Nick (author), de Vries, Alexander (author), Ouasghiri, Mohamed (author), Verschoor, Pieter (author), Warffemius, Pim (author), Wiersma, Mark (author)Het delen van ongebruikte en/of onderbenutte middelen kan nieuwe verbeteringen opleveren in de logistieke waardeketen. In vijf sectoren van het stedelijk goederenvervoer, te weten stadslogistiek, bouwlogistiek, transport & warehousing (retaillogistiek), zorglogistiek en servicelogistiek, worden concepten voor het delen van diensten...journal article 2022
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van der Toorn, J. (author), Wiersma, R.T. (author), Vandivere, Abbie (author), Marroquim, Ricardo (author), Eisemann, E. (author)Multimodal imaging is used by conservators and scientists to study the composition of paintings. To aid the combined analysis of these digitisations, such images must first be aligned. Rather than proposing a new domain-specific descriptor, we explore and evaluate how existing feature descriptors from related fields can improve the performance...conference paper 2022
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Wiersma, M.S.J. (author), Heiles, B.G. (author), Kalisvaart, D. (author), Maresca, D. (author), Smith, C.S. (author)Ultrasound localization microscopy (ULM) is a vascular imaging method that provides a 10-fold improvement in resolution compared to ultrasound Doppler imaging. Because typical ULM acquisitions accumulate large numbers of synthetic microbubble (MB) trajectories over hundreds of cardiac cycles, transient hemodynamic variations such as pulsatility...journal article 2022
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Lin, Y. (author), Wiersma, R.T. (author), Pintea, S. (author), Hildebrandt, K.A. (author), Eisemann, E. (author), van Gemert, J.C. (author)Deep learning has improved vanishing point detection in images. Yet, deep networks require expensive annotated datasets trained on costly hardware and do not generalize to even slightly different domains, and minor problem variants. Here, we address these issues by injecting deep vanishing point detection networks with prior knowledge. This...conference paper 2022
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Wiersma, P.G. (author), Aerts, J.P.M. (author), Zekollari, H. (author), Hrachowitz, M. (author), Drost, Niels (author), Huss, Matthias (author), Sutanudjaja, Edwin H. (author), Hut, R.W. (author)Global hydrological models have become a valuable tool for a range of global impact studies related to water resources. However, glacier parameterization is often simplistic or non-existent in global hydrological models. By contrast, global glacier models do represent complex glacier dynamics and glacier evolution, and as such, they hold the...journal article 2022
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Wiersma, R.T. (author), Nasikun, A. (author), Eisemann, E. (author), Hildebrandt, K.A. (author)Learning from 3D point-cloud data has rapidly gained momentum, motivated by the success of deep learning on images and the increased availability of 3D~data. In this paper, we aim to construct anisotropic convolution layers that work directly on the surface derived from a point cloud. This is challenging because of the lack of a global...journal article 2022
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Wiersma, S.J. (author)The yeast Saccharomyces cerevisiae has been used by humans for many centuries in microbial fermentation processes for the production of, for example, bread and alcoholic beverages. This long history of use and, in addition, its fast growth, its ability to rapidly convert sugars into ethanol and the ease with which it can be genetically modified,...doctoral thesis 2021
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Bouwknegt, J. (author), Wiersma, S.J. (author), Ortiz Merino, R.A. (author), Doornenbal, E.S.R. (author), Buitenhuis, Petrik (author), Giera, Martin (author), Müller, Christoph (author), Pronk, J.T. (author)Biosynthesis of sterols, which are key constituents of canonical eukaryotic membranes, requiresmolecular oxygen. Anaerobic protists and deep-branching anaerobic fungi are the only eukaryotes in which a mechanism for sterol-independent growth has been elucidated. In these organisms, tetrahymanol, formed through oxygen-independent cyclization...journal article 2021
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Huismans, Y. (author), Koopmans, H. (author), Wiersma, Ane (author), de Haas, Tjalling (author), Berends, Koen (author), Sloff, C.J. (author), Stouthamer, Esther (author)River deltas commonly have a heterogeneous substratum of alternating peat, clay and sand deposits. This has important consequences for the river bed development and in particular for scour hole formation. When the substratum consists of an erosion resistant top layer, erosion is retarded. Upon breaking through a resistant top layer and...journal article 2021
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Perli, T. (author), Vos, A.M. (author), Bouwknegt, J. (author), Dekker, W.J.C. (author), Wiersma, S.J. (author), Mooiman, C. (author), Ortiz Merino, R.A. (author), Daran, J.G. (author), Pronk, J.T. (author)Neocallimastigomycetes are unique examples of strictly anaerobic eukaryotes. This study investigates how these anaerobic fungi bypass reactions involved in synthesis of pyridine nucleotide cofactors and coenzyme A that, in canonical fungal pathways, require molecular oxygen. Analysis of Neocallimastigomycetes proteomes identified a candidate...journal article 2021
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Mooiman, C. (author), Bouwknegt, J. (author), Dekker, W.J.C. (author), Wiersma, S.J. (author), Ortiz Merino, R.A. (author), de Hulster, A.F. (author), Pronk, J.T. (author)All known facultatively fermentative yeasts require molecular oxygen for growth. Only in a small number of yeast species, these requirements can be circumvented by supplementation of known anaerobic growth factors such as nicotinate, sterols and unsaturated fatty acids. Biosynthetic oxygen requirements of yeasts are typically small and,...journal article 2021
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Wiersma, R.T. (author), Eisemann, E. (author), Hildebrandt, K.A. (author)This paper is concerned with a fundamental problem in geometric deep learning that arises in the construction of convolutional neural networks on surfaces. Due to curvature, the transport of filter kernels on surfaces results in a rotational ambiguity, which prevents a uniform alignment of these kernels on the surface. We propose a network...journal article 2020
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Mulder, A.E. (author), Wiersma, M.G. (author), van Loenen, B. (author)The increasing need for geospatial information demands for well-organised management among all levels of society. A Spatial Data Infrastructure (SDI) is a multidisciplinary and dynamic instrument that facilitates access and sharing of geospatial information. The current trend towards open data initiatives is influencing the development of these...journal article 2020
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Di Cicco, F. (author), Wiersma, Lisa (author), Wijntjes, M.W.A. (author), Pont, S.C. (author)Painters mastered replicating the regularities of the visual patterns that we use to infer different materials and their properties, via meticulous observation of the way light reveals the world's textures. The convincing depiction of bunches of grapes is particularly interesting. A convincing portrayal of grapes requires a balanced...journal article 2020
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Wiersma, S.J. (author), Mooiman, C. (author), Giera, Martin (author), Pronk, J.T. (author)Biosynthesis of sterols, which are considered essential components of virtually all eukaryotic membranes, requires molecular oxygen. Anaerobic growth of the yeast Saccharomyces cerevisiae therefore strictly depends on sterol supplementation of synthetic growth media. Neocallimastigomycota are a group of strictly anaerobic fungi which, instead...journal article 2020
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Wempe, Joost (author), van den Brink, Rick (author), Mooldijk, Esmée (author), Feirabend, Nienke (author), Wiersma, R.T. (author), Sietsma, J. (author), Dik, J. (author)During the Second World War the German occupants of the Netherlands made ample use of the Scheveningen prison near The Hague, popularly nicknamed the Oranjehotel. One former death cell in this infamous prison (Doodencel 601) has been preserved in its original condition, showing wartime inscriptions on the cell walls. Interestingly, a small...journal article 2020
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Taale, Henk (author), Wiersma, Bouke (author), de Bruin, Rudie (author)Eind 2018 werd het programma Beter Benutten Vervolg definitief afgerond met de publicatie van het evaluatierapport. Van 2015 tot 2017 zijn in 12 regio’s allerlei maatregelen geïmplementeerd, variërend van het verbeteren van bestaande fietsroutes tot optimalisatie van logistieke processen, en van het aanpassen van collegetijden van hogescholen...conference paper 2019