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Dow, Alan (author), Hart, K.P. (author), van Mill, J. (author), Vermeer, J. (author)We present examples of realcompact spaces with closed subsets that are C*-embedded but not C-embedded, including one where the closed set is a copy of N. <br/>journal article 2023
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Werker, A. (author), Pei, R. (author), Kim, Kevin (author), Moretto, Giulia (author), Estevez Alonso, A. (author), Vermeer, C.M. (author), Arcos-Hernandez, Monica (author), Dijkstra, Jelmer (author), de Vries, Erik (author)Past studies have repeatedly demonstrated the technical feasibility to produce polyhydroxyalkanoate (PHA) using bacterial biomass of mixed microbial cultures (MMCs). Commercial quality grades of poly(3-hydroxybutyrate-co-3-hydroxyvalerate), PHBV, can be produced with control of average monomer composition. However, demonstration of PHBV...journal article 2023
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Vermeer, C.M. (author), Nielsen, Maaike (author), Eckhardt, Vincent (author), Hortensius, Matthijs (author), Tamis, J. (author), Picken, S.J. (author), Meesters, G.M.H. (author), Kleerebezem, R. (author)The biotechnological production of poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) derived from organic waste streams by mixed microbial communities is well established at the pilot-level. However, there is limited research on the recovery of the biopolymer from the microbial biomass, while its impact on product quality and product costs...journal article 2022
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Vigueras Guillén, J.P. (author), van Rooij, J.G.J. (author), van Dooren, Bart T.H. (author), Lemij, Hans G. (author), Islamaj, Esma (author), van Vliet, L.J. (author), Vermeer, K.A. (author)Corneal guttae, which are the abnormal growth of extracellular matrix in the corneal endothelium, are observed in specular images as black droplets that occlude the endothelial cells. To estimate the corneal parameters (endothelial cell density [ECD], coefficient of variation [CV], and hexagonality [HEX]), we propose a new deep learning...journal article 2022
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Vermeer, C.M. (author), Bons, Larissa J. (author), Kleerebezem, R. (author)Abstract: Using microbial enrichment cultures for the production of waste-derived polyhydroxyalkanoates (PHAs) is a promising technology to recover secondary resources. Volatile fatty acids (VFAs) form the preferred substrate for PHA production. Isobutyrate is a VFA appearing in multiple waste valorization routes, such as anaerobic...journal article 2022
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Vermeer, W.W.M. (author), Chandra Mouli, G.R. (author), Bauer, P. (author)This paper proposes a method for optimally dimensioning the components of a prosumer energy management system that integrates photovoltaic (PV) panels, multiple bidirectional electric vehicle chargers, an inverter, and a battery energy storage charger. Besides optimally dimensioning the components, it also optimizes power management while...journal article 2022
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Vermeer, C.M. (author), Depaz, Lena (author), van den Berg, Emily (author), Koelmans, Tom (author), Kleerebezem, R. (author)Medium-chain-length polyhydroxyalkanoate (mcl-PHA) production by using microbial enrichments is a promising but largely unexplored approach to obtain elastomeric biomaterials from secondary resources. In this study, several enrichment strategies were tested to select a community with a high mcl-PHA storage capacity when feeding octanoate. On...journal article 2022
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Vermeer, W.W.M. (author), Chandra Mouli, G.R. (author), Bauer, P. (author)Battery aging is one of the critical problems to be tackled in battery research, as it limits the power and energy capacity during the battery's life. Therefore, optimizing the design of battery systems requires a good understanding of aging behavior. Due to their simplicity, empirical and semiempirical models (EMs) are frequently used in...journal article 2022
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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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Vermeer, C.M. (author), Rossi, E. (author), Tamis, J. (author), Jonkers, H.M. (author), Kleerebezem, R. (author)Polyhydroxyalkanoate (PHA) production is a promising opportunity to recover organic carbon from waste streams. However, widespread application of waste-derived PHA as biodegradable plastic is restricted by expensive purification steps, high quality requirements, and a fierce competition with the conventional plastic market. To overcome these...journal article 2021
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Rossi, E. (author), Vermeer, C.M. (author), Mors, R.M. (author), Kleerebezem, R. (author), Copuroglu, Oguzhan (author), Jonkers, H.M. (author)Bacteria-based self-healing concrete has the ability to heal cracks due to the bacterial conversion of incorporated organic compounds into calcium carbonate. Precipitates seal the cracks, theoretically increasing the service life of constructions. The aim of this paper is to propose a precursor for bacteria-based self-healing concrete derived...journal article 2021
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Bier, H.H. (author), Vermeer, E.C.F. (author), Hidding, A.J. (author), Jani, K.K. (author)In order for off-Earth top surface structures built from regolith to protect astronauts from radiation, they need to be several meters thick. Technical University Delft (TUD) proposes to excavate into the ground to create subsurface habitats. By excavating, not only can natural protection from radiation be achieved but also thermal insulation,...journal article 2021
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de Vries, Tim N.C. (author), Bronkhorst, Joris (author), Vermeer, Martijn (author), Donker, Jaap C.B. (author), Briels, Sven A. (author), Ziar, H. (author), Zeman, M. (author), Isabella, O. (author)A quick-scan yield prediction method has been developed to assess rooftop photovoltaic (PV) potential. The method has three main parts. For each roof, first (i) virtual 3D roof segments were reconstructed using aerial imagery, then, (ii) PV modules were automatically fitted onto roof segments using a fitting algorithm and finally, (iii) expected...journal article 2020
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Vigueras Guillén, J.P. (author), van Rooij, Jeroen (author), Engel, Angela (author), Lemij, Hans G. (author), van Vliet, L.J. (author), Vermeer, K.A. (author)Purpose: To present a fully automatic method to estimate the corneal endothelium parameters from specular microscopy images and to use it to study a one-year follow-up after ultrathin Descemet stripping automated endothelial keratoplasty. Methods: We analyzed 383 post ultrathin Descemet stripping automated endothelial keratoplasty images from...journal article 2020
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Ghafaryasl, B. (author), Vermeer, Koenraad A. (author), Kalkman, J. (author), Dore-Callewaert, T.W.J. (author), Boer, Johannes F.D.E. (author), van Vliet, L.J. (author)The attenuation coefficient (AC) is an optical property of tissue that can be estimated from optical coherence tomography (OCT) data. In this paper, we aim to estimate the AC accurately by compensating for the shape of the focused beam. For this, we propose a method to estimate the axial PSF model parameters and AC by fitting a model for an...journal article 2020
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Vermeer, W.W.M. (author), Chandra Mouli, G.R. (author), Bauer, P. (author)This paper proposes a two-stage smart charging algorithm for future buildings equipped with an electric vehicle, battery energy storage, solar panels, and a heat pump. The first stage is a non-linear programming model that optimizes the charging of electric vehicles and battery energy storage based on a prediction of photovoltaïc (PV) power,...journal article 2020
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Vigueras Guillén, J.P. (author), Sari, B. (author), Goes, S.F. (author), Lemij, Hans G. (author), van Rooij, Jeroen (author), Vermeer, K.A. (author), van Vliet, L.J. (author)Background<br/><br/>Corneal endothelium (CE) images provide valuable clinical information regarding the health state of the cornea. Computation of the clinical morphometric parameters requires the segmentation of endothelial cell images. Current techniques to image the endothelium in vivo deliver low quality images, which makes automatic...journal article 2019
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Alaka, Shaad (author), Cunha, Max Lopes (author), Vermeer, Jop (author), Ziliotto Salamon, N. (author), Balint, J.T. (author), Bidarra, Rafael (author)Working in teams is a common approach to solving problems. However, new teams often suffer from a form of cold start, by which individual members are not yet comfortable expressing their ideas. Previous work has shown that ideation can be stimulated by promoting a sense of psychological safety among team members and instilling an ambiance of...journal article 2019
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Vigueras Guillén, J.P. (author), Andrinopoulou, Eleni Rosalina (author), Engel, Angela (author), Lemij, Hans G. (author), van Rooij, J. (author), Vermeer, K.A. (author), van Vliet, L.J. (author)Corneal endothelium images obtained by in vivo specular microscopy provide important information to assess the health status of the cornea. Estimation of clinical parameters, such as cell density, polymegethism, and pleomorphism, requires accurate cell segmentation. State-of-the-art techniques to automatically segment the endothelium are...journal article 2018
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Adal, K.M. (author), Van Etten, Peter G. (author), Martinez, Jose P (author), Rouwen, Kenneth W. (author), Vermeer, K.A. (author), van Vliet, L.J. (author)People with diabetes mellitus need annual screening to check for the development of diabetic retinopathy. Tracking small retinal changes due to early diabetic retinopathy lesions in longitudinal fundus image sets is challenging due to intra- and inter-visit variability in illumination and image quality, the required high registration accuracy...journal article 2017
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