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Kozhevnikov, A. (author), Kunnen, R.P.J. (author), van Baars, G.E. (author), Clercx, H.J.H. (author)Purpose – This study aims to examine the feasibility of feedforward actuation of the recoater blade position to alleviate the resin surface nonuniformity while moving over deep-to-shallow transitions of submerged (already cured) geometric features. Design/methodology/approach – A two-dimensional computational fluid dynamics (CFD) model has been...article 2022
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- Visschers, F.L.L. (author), Massaad, J. (author), van Neer, P.L.M.J. (author), Verweij, M.D. (author), Liu, D. (author), Broer, D.J. (author) article 2022
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Kozhevnikov, A. (author), Kunnen, R.P.J. (author), van Baars, G.E. (author), Clercx, H.J.H. (author)The leading edge bulge is a known defect in stereolithography with free-surface recoating. It is a resin excess that remains after deposition over a deep-to-shallow topographic transition, the leading edge of the cavity. In this paper, we explore an approach based on changing the gap between the recoating blade and the previously cured layer to...article 2021
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- Piras, D. (author), van Neer, P.L.M.J. (author), Thijssen, R.M.T. (author), Sadeghian, H. (author) article 2020
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Kozhevnikov, A. (author), Kunnen, R.P.J. (author), van Baars, G.E. (author), Clercx, H.J.H. (author)The recoating step in stereolithography (SL) is one of the principal sources of inaccuracies. The liquid layer deposition on top of irregular topography leads to a non-uniform layer thickness which eventually results in a poor quality of the final product. To compensate the unevenness of the underlying geometry, an approach where the recoating...article 2020
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Pierik, H.J. (author), Stouthamer, E. (author), Cohen, K.M. (author)This paper presents reconstructions on natural levee development in the Rhine-Meuse delta, the Netherlands, during the first millennium CE, covering the full delta plain. It is the first study that performs this on a delta scale, which allows seeing the delta-wide trends on levee-forming controls and their feedbacks. We mapped the levee...article 2017
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van Es, M.H. (author), Sadeghian Marnani, H. (author)Inspection of EUV mask substrates and blanks is demanding. We envision this is a good target application for massively parallel Atomic Force Microscopy (AFM). We envision to do a full surface characterization of EUV masks with AFM enabling 1nm true 3D resolution over the entire surface. The limiting factor to do this is in the sensor itself:...conference paper 2016
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van Heteren, S. (author)Barrier-system dynamics are a function of antecedent topography and substrate lithology, Relative sea-level (RSL) changes, sediment availability and type, climate, vegetation type and cover, and various aero- and hydrodynamic processes during fair-weather conditions and extreme events. Global change has an influence on many of these drivers....bookPart 2015
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Bergmans, R.H. (author), Nieuwenkamp, H.J. (author), Kok, G.J.P. (author), Blobel, G. (author), Nouira, H. (author), Küng, A. (author), Baas, M. (author), te Voert, M.J.A. (author), Baer, G. (author), Stuerwald, S. (author)A comparison of topography measurements of aspherical surfaces was carried out by European metrology institutes, other research institutes and a company as part of an European metrology research project. In this paper the results of this comparison are presented. Two artefacts were circulated, a small polymer coated aspherical lens with a clear...article 2015
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Vincenc Obona, J. (author), Ocelík, V. (author), Skolski, J.Z.P. (author), Mitko, V.S. (author), Römer, G.R.B.E. (author), Huis In't Veld, A.J. (author), de Hosson, J.T.M. (author)This paper concentrates on observations of the surface topography by scanning electron microscopy (SEM) on alloyed and stainless steels samples treated by ultrashort laser pulses with duration of 210 fs and 6.7 ps. Globular-like and jet-like objects were found depending on the various levels of the fluence applied. It is shown that these...article 2011
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Jarzab, D. (author), Lu, M. (author), Nicolai, H.T. (author), Blom, P.W.M. (author), Loi, M.A. (author)Here we report on a combined photoluminescence and morphological study of a polymer-polymer blend composed of a copolymer of derivatives of polyspirobifluorene and polyfluorene (PBFF) and a derivative of polyphenylene vinylene (MDMO-PPV). Evidence of partial Förster energy transfer from PBFF to MDMO-PPV is revealed by steady-state and time...article 2011
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van Zon, A.T. (author), Roy Chowdhury, K. (author), TNO Defensie en Veiligheid (author)In this study, a regional scale gravity data set has been inverted to infer the structure (topography) of the top of the basement underlying sub-horizontal strata. We apply our method to this real data set for further proof of concept, validation and benchmarking against results from an earlier forward modelling done elsewhere.Our aim is to...article 2010
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Kudryavtsev, Y.V. (author), Gelinck, E.R.M. (author), Fischer, H.R. (author), TNO Industrie en Techniek (author)A theoretical investigation of van der Waals forces acting between two solid silicon surfaces at separations from zero to approximately 20 nm is presented. We focused our efforts on the analysis of different factors that can cause deviations from the classical pressure-distance dependence p ∼ 1/D3. It is demonstrated that a layer (oxide or water...article 2009
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Mathijssen, S.G.J. (author), Smits, E.C.P. (author), van Hal, P.A. (author), Wondergem, H.J. (author), Ponomarenko, S.A. (author), Moser, A. (author), Resel, R. (author), Bobbert, P.A. (author), Kemerink, M. (author), Janssen, R.A.J. (author), de Leeuw, D.M. (author), TNO Industrie en Techniek (author)The mobility of self-assembled monolayer field-effect transistors (SAMFETs) traditionally decreases dramatically with increasing channel length. Recently, however, SAMFETs using liquid-crystalline molecules have been shown to have bulk-like mobilities that are virtually independent of channel length. Here, we reconcile these scaling relations by...article 2009
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Cloetingh, S. (author), Cornu, T. (author), Ziegler, P.A. (author), Beekman, F. (author), Ustaszewski, K. (author), Schmid, S.M. (author), Dèzes, P. (author), Hinsch, R. (author), Decker, K. (author), Lopes Gardozo, G. (author), Granet, M. (author), Bertrand, G. (author), Behrmann, J. (author), van Balen, R. (author), Michon, L. (author), Pagnier, H. (author), Rozsa, S. (author), Heck, B. (author), Tesauro, M. (author), Kahle, H.G. (author), Dewez, T. (author), Carretier, S. (author), Winter, T. (author), Hardebol, N. (author), Bada, G. (author), Dost, B. (author), van Eck, T. (author), TNO Bouw en Ondergrond (author)Research on neotectonics and related seismicity has hitherto been mostly focused on active plate boundaries that are characterized by generally high levels of earthquake activity. Current seismic hazard estimates for intraplate domains are mainly based on probabilistic analyses of historical and instrumental earthquake catalogues. The accuracy...article 2006
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Greidanus, H.S.F. (author), Huising, E.J. (author), Platschorre, Y. (author), van Bree, R.J.P. (author), van Halsema, D. (author), Vaessen, E.M.J. (author), TNO Fysisch en Elektronisch Laboratorium (author)Digital elevation models (DEMs) are produced from airborne radar cross-track interferometric measurements. Radar DEMs recorded from perpendicular orientations are intercompared, and compared to DEMs derived from airborne laser altimetryconference paper 1999
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Neele, F.P. (author), de Regt, H. (author), TNO Fysisch en Elektronisch Laboratorium (author)This paper presents a method to invert underside-reflection (P(d)P or S(d)S arrivals) data for lateral depth variations of upper-mantle discontinuities, combining traveltime and amplitude data. The method greatly improves the resolution of small-scale undulations obtained by existing imaging methods and does not suffer from the long-wavelength...article 1999
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Greidanus, H. (author), TNO Fysisch en Elektronisch Laboratorium (author)The bottom topography in shallow seas can be observed by air- and space borne radar. The paper reviews the radar imaging mechanism, and discusses the possibilities and limitations for practical use of radar in bathymetric applications, including the types of radar instruments available for this purpose.article 1997
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TNO Fysisch en Elektronisch Laboratorium (author), Vogelzang, J. (author), Wensink, G.J. (author), Calkoen, C.J. (author), van der Kooij, M.W.A. (author)On August 16, 1989, and on July 12, 1991, experiments were performed to study the mapping of submarine sand waves with the airborne imaging radar, a polarimetric (and, in 1991, interferometric) airborne P, L, and C band synthetic aperture radar system. The experiments took place in an area 30 km off the coast of the Netherlands, where the bottom...article 1997
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van den Broek, A.C. (author), Rijckenberg, G.J. (author), Davidson, M. (author), Freeman, A. (author), TNO Fysisch en Elektronisch Laboratorium (author)We compared polarimetric C- and L-band and ground truth data from bare soil, young wheat and mature maize fields of the agricultural test site Flevoland in the Netherlands collected during the SIR-C campaign in April and October 1994. We find that the L-band is more sensitive to the soil roughness than the C-band. In particular L-band HH gives...conference paper 1995