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Walters, C.L. (author), Voormeeren, L.O. (author), Janssen, M. (author), Wallin, K. (author)
Standards have traditionally required that fracture toughness specimens be the full thickness of the base material. However, this requirement may be unnecessary, especially if minimum specimen size dimensions based on plastic zone are met and the subsized specimens are statistically adjusted for the size effect. The current paper presents the...
conference paper 2013
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van 't Ooster, A. (author), van Henten, E.J. (author), Janssen, E.G.O.N. (author), Bongaerts, E. (author), TNO Bouw en Ondergrond (author)
Discomfort caused by light pollution from greenhouses that apply supplementary lighting is an issue in Dutch society nowadays. At this moment Dutch legislation requires an opaque screen that reduces light transmission of the greenhouse wall by 95%. In 2008 also the light transmission of the greenhouse roof must be reduced equally and...
conference paper 2008
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van 't Ooster, A. (author), de Wit, J. (author), Janssen, E.G.O.N. (author), Ruigrok, J. (author), TNO bouw en ondergrond (author)
This research focuses on the role of heat buffers to support optimal use of combinations of traditional and renewable heat sources like geothermal heat for greenhouse heating. The objective was to determine the contribution of heat buffers to effective new combinations of resources that satisfy greenhouse heat, carbon dioxide and electricity...
conference paper 2008
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Janssen, E.G.O.N. (author), Tse, T.C. (author), Mas, J.L. (author), Elvira, J. (author), Hovland, S. (author), TNO Bouw en Ondergrond (author)
This paper describes a design proposal for adapting the OGEGU Food Production Unit (FPU) to the surface of Mars in order to produce up to 40% of the diet for a six-member crew by growing a pre-defined set of vegetable food species. The external structure, lighting system and plant support system are assessed using ESM analysis. The study shows...
conference paper 2005
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Janssen, E.G.O.N. (author), Zonneveldt, L. (author), Sools, F. (author), TNO Bouw en Ondergrond (author)
TNO has developed a Radiance software model to calculate the light distribution in the greenhouse using raytracing methods, suitable for daylight and artificial lighting. The model is based on a 3d CAD model. The objective is to maximize the efficiency of the artificial lighting system (the amount of light from the bulbs reaching the crops)....
conference paper 2005
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