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Walraven, J. (author), Dieteren, G. (author)For the assessment of concrete structures in the new fib Model Code 2020 (fib MC 2020), three categories are distinguished: (1) the residual capacity of existing structures without damage, (2) the residual capacity of structures suffering deterioration, and (3) the residual capacity of structures with noncompliant details. In the accompanying...article 2023
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Matthews, S. (author), Bigaj-van Vliet, A. (author), Walraven, J. (author), Mancini, G. (author), Dieteren, G. (author)Discussions have been underway in fib (Fédération Internationale du Béton) about advancing the fib Model Code for concrete structures. These include the fib international workshop in The Hague (June 2015), the fib MC2020 Core Group meeting in Madrid (December 2015), and a series of follow-up worldwide consultations on the fib ambition regarding...article 2018
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Walraven, J. (author), Bigaj-van Vliet, A.J. (author)Om richting te geven aan de ontwikkeling van nieuwe internationale normen, zoals de Eurocodes,article 2016
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Walraven, J. (author), Vrouwenvelder, A.C.W.M. (author)Tot voor kort leefde Nederland mee met de gevolgen van aardbevingen in de wereld, in de veronderstelling dat dit ver van ons bed was. Door de recente aardschokken in Groningen zijn in ons land andere ideeën ontstaan over de invloed van aardbevingen op de gebouwde omgeving. In dit artikel worden de herkomst en de karakteristieken van de Groninger...article 2015
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Dieteren, G.G.A. (author), de Boer, A. (author), Walraven, J. (author)Het proefbelasten van bruggen is een methode om te bepalen of de constructie de rekenkundige belasting kan dragen. Dit is van belang voor oudere constructies waarvan de draagkracht onbekend is, of die inmiddels aan een grotere belasting worden onderworpen dan waarvoor zij oorspronkelijk zijn ontworpen. Proefbelasten mag echter niet leiden tot...article 2012
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Lucassen, M.P. (author), Walraven, J. (author), TNO Defensie en Veiligheid (author)In a preceding study we measured human color constancy in experimental conditions in which simulated illuminants and surface colors were varied in the chromatic domain only. Both illumination level and sample re.ectance were fixed in that study. In the present study we focus on the achromatic dimension, both with respect to luminance contrast ...article 2005
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Dijk, J. (author), Verbeek, P.W. (author), Walraven, J. (author), Young, I.T. (author)We present the results of experiments in which we manipulated color images in the CIELAB space by first applying a scaling factor on chroma (C*). After this we applied a gamma transformation (an exponent relating the input to the output) to the luminance (Y) in XYZ space, while keeping the chromaticity values (x, y) constant. The aim of the...conference paper 2002
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- Walraven, J. (author), Alferdinck, J.W.A.M. (author), TNO Technische Menskunde (author) bookPart 2001
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- Walraven, J. (author), TNO Technische Menskunde (author) bookPart 2001
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- Walraven, J. (author), TNO Technische Menskunde (author) bookPart 2001
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Blick, D.W. (author), Beer, J.M.A. (author), Kosnik, W.D. (author), Troxel, S. (author), Toet, A. (author), Walraven, J. (author), Mitchell, W. (author), TNO Technische Menskunde (author)Two methods for estimating the visual effects of light scattered from a laser glare source were compared: (1) a veiling luminance (VL) model that convolves a radiometric scan of the corneal light distribution with a point-spread function to calculate the retinal distribution and (2) psychophysically determined equivalent background luminance ...article 2001
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Toet, A. (author), Walraven, J. (author), TNO Technische Menskunde (author)A pixel based colour mapping algorithm is presented that produces a fused false colour rendering of two gray level images representing different sensor modalities. The result-ing fused false colour images have a higher information content than each of the original images and retain sensor-specific image information. The unique component of each...article 1996
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Walraven, J. (author), den Uijl, J. (author), Strobrand, J. (author), Al-Zubri, N. (author), Gijsbers, J. (author)As a result of a number of reasons new interest developed into the use of lightweight aggregate concrete. Within the scope of this development, a modemized code for lightweight concrete had to be written. In order to support this development, a number of research projects have been carried out. The aim of the research was to verify the...article 1995
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Walraven, J. (author), Janzen, P. (author)In this investigation, carried out under a Youth Health Care postgraduate course in Nijmegen, the stereopsis of a school population of 730 children, aged 4-18 years, was recorded and clinically evaluated. Stereopsis was measured using the TNO test, a random-dot stereo test especially designed for the early detection of amblyopia. The main aims...article 1993
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Walraven, J. (author), Werner, J.S. (author)The locus of unique white was measured for two observers over a wide range of stimulus intensities, using both direct matching and absolute judgements. Chromaticity coordinates of each observer's unique white were found to be invariant over a range of about 4 log units. This result is discussed in the context of the class of models that explain...article 1991
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- Walraven, P.L. (author), Walraven, J. (author), Instituut voor Zintuigfysiologie TNO (author) conference paper 1989
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- Instituut voor Zintuigfysiologie TNO (author), Walraven, J. (author), Janzen, P. (author) article 1983
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- Instituut voor Zintuigfysiologie TNO (author), Walraven, J. (author) doctoral thesis 1981
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- Walraven, J. (author), Instituut voor Zintuigfysiologie TNO (author) article 1979
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- Walraven, J. (author), Instituut voor Zintuigfysiologie TNO (author) article 1975
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