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van Benthem, R.C. (author), van den Assem, D. (author), Krooneman, J. (author)During long-duration manned space-missions complex chemical and biological processes need to be managed accurately for the recycling of human wastes and to produce human consumables. As a result, there is an increasing interest in how the characteristics of microbes are influenced by micro-gravity. Compact optical instrumentation allows for real...report 2001
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van den Assem, D. (author), Kramer, A.J. (author)This document contains the description of a breadboard and demonstration of its performance, of a modular optically induced fluorescence detector. The detector will be part of the miniaturized CApiUary ELectrophoresis In Space (CAELIS) chemical analysis instrument. The breadboard of the instrument consists of an excitation module with a diode...report 1996
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van den Assem, D. (author), Kramer, A.J. (author)This document contains the description of a conceptual design and the breadboarding approach of a modular optically induced fluorescence detector, to be used in a miniaturized Capillary Electrophoresis analysis instrument. The concept is based on an assessment and selection described in the preceding part I of the present report. The design...report 1996
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van den Assem, D. (author), Kramer, A.J. (author)This document contains the description of the assessment of configuration concepts for an optically induced fluorescence detector, to be used on a miniaturized Capillary Electrophoresis (CE) instrument. The assessment is concluded with the selection of a concept for further instrument design and breadboarding. The selected concept consists of...report 1996
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Kramer, A.J. (author), van den Assem, D. (author)The present paper describes a concept (reference 1) for accommodation of optical diagnostics around a fluid filled experiment cell in a facility for observation of fluid physical phenomena in a microgravity environment The concept includes video observation of an experiment cell interior, interferometry and IR thermography along two directions...report 1995
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van den Assem, D. (author)The present contractor report presents some solutions for the optical diagnosis of the interior of a small drop, in which protein crystals are formed by the liquid-vapour method. At first a summary is given of the relevant parameters for the process. Accordingly the appropriate diagnostic methods are reviewed. Finally two methods have been...report 1992
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van den Assem, D. (author)The present report was drafted within the scope of the advocated harmonization of the Netherlands' activities concerning ARMADE and DUC. High Performance Capillary Electrophoris (HPCE) has been appointed as one of the pilot instruments to be operated via the DUC, just as will be, most probably, ARMADE. As a consequence the present report gives a...report 1991
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van den Assem, D. (author), Spaan, F. (author), Vreeburg, J. (author), Falk, F. (author), Heide, W. (author), Langbein, D. (author)This executive summary reports the results of the conceptual study of a mini fluid science laboratory (MFSL). The MFSL is designed to provide effective microgravity on earth and so allows substantiation of the viability of fluid physics experiments in space-based laboratories. Detailed results have been reported in parts I through III of NLR CR...report 1990
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van den Assem, D. (author), Huijser, R.H. (author)An optical diagnostic instrument is being developed for fluid physics research in the microgravity environment of a space laboratory. The instrument offers a whole field observation system with a Schlieren overlay combined with a local narrow field observation capability, the stake system. The latter allows for operation of a variety of optical...report 1987
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van den Assem, D. (author), Huijser, R.H. (author)An optical diagnostic instrument is being developed for fluid physics research in the microgravity environment of a space laboratory. The instrument offers a whole filed observation system with a Schlieren overlay combined with a local narrow field observation capability, the stake system. The latter allows for operation of a variety of optical ...report 1987
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- van den Assem, D. (author), Huijser, R.H. (author) report 1987
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Huijser, R.H. (author), van den Assem, D. (author)An optical diagnostic instrument is being developed taking up design challenges derived both from experiment requirements for microgravity fluid physics research and from boundary conditions imposed by taking into account possible accommodation in a space laboratory. The instrument combines an observation system that provides an image of the...report 1986
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van den Assem, D. (author), Huijser, R.H. (author), vreeburg, J.P.B. (author)An optical diagnostic instrument is being developed for execution and observation of fluid physics experiments in microgravity on board a manned space laboratory (e.g. Spacelab). The instrument combines a wide field scene and Schlieren observation system of a diffusely illuminated fluid physics experiment with a facility to operate various...report 1986
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van den Assem, D. (author)This report describes the result of a study of past and present use in fluid research of "sensing tracers" and the identification of possible new materials for, and types of, sensing tracers. An attempt has been made to identify applications and, in some cases, to estimate the performance of a particular type of tracer. For completeness a...report 1984
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van den Assem, D. (author)This document is a short description of a model for the fluid flow through a stack of one or more layers of wiregauze. The stack may be clamped between two flat walls or mounted on a wall or be completely free from walls. The flow direction is in the plane of the gauze layer. A model for the flow through a combination of a gauze and a slit...report 1983
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van den Assem, D. (author), Bunk, P.B. (author)Preliminary experiments have been performed with a laboratory model of an electro-osmotic heat pipe filled with ethanol. With dismounted electro-osmotic pump, the heat transport through the pipe and the temperature distribution along the pipe wall have been measured. The measurements have been performed as a function of the temperature...report 1983
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Vreeburg, J.P.B. (author), van den Assem, D. (author)A short review of the use of aircraft to generate weightlessness is given. Some of the aircraft that have been used for this purpose are mentioned and their desirable characteristics are discussed. Particulars on instrumentation, modifications and flight parameters are given of the facility used by NLR, a Hawker Hunter T Mk 7 aircraft. A test...report 1980
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- van den Assem, D. (author), Daniels, D.H.W. (author) report 1978
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van den Assem, D. (author), Slippens, C.P.R.C. (author)This note deals with the determination of the response of a number of different types of pipe collimators. Attention is paid to the modification of the response characteristics by tilting a number of subcollimators with respect to each other or by baffling of the individual pipes. Two methods of calculation of the influence of the principal...report 1972