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Klinker, F. (author), Pietersen, O.B.M. (author), Vreeburg, J.P.B. (author)
In a ground-satellite-aircraft communication system the aircraft antenna is a critical part since it has to meet the typical environmental requirements and possess a rather high gain. This paper describes a suitable antenna system, installed on a Fokker Friendship aircraft. It consists of a linear array of blade antennas, a power division and...
report 1973
document
Vreeburg, J.P.B. (author)
After a short introduction to various types of links and network organisations, the experimental phase in military satellite communications systems is expounded in a chronological discussion of early communications satellites. This experimental phase is considered to be ended with the TASCAT and IDCSP satellites. Present systems and systems of...
report 1974
document
Vreeburg, J.P.B. (author)
The proposed experiments are intended to provide basic and engineering information about liquid-solid body interaction, forced liquid motion and free surface behaviour, all in a 0-g environment. Three series of complementary experiments are defined which should yield qualitative information about liquid—solid dynamics phenomena. The first series...
report 1976
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Vreeburg, J.P.B. (author)
The major attractiveness of space processing of materials derives from the option to establish transport phenomena in a large quantity of liquid that IS either weightless or acted on solely by a (non-potential) rotational acceleration field. Thus it becomes possible to exploit various material currents that on earth are disrupted completely by...
report 1977
document
Vreeburg, J.P.B. (author)
Some experiments with partially filled liquid containers proposed by the NLR are scheduled for execution on the first flight of Spacelab. The relevance of these experiments to spacecraft attitude control is pointed out. Various considerations that relate to the design of the experiments are discussed and clarified with references to literature....
report 1977
document
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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Vreeburg, J.P.B. (author)
The study culminates in requirements for facilities and instrumentation of a laboratory supporting microgravity fluid physics experiments and equipment developments. The requirements are based on reviews of candidate areas of experimentation and proposed or actual experiment facilities. Present deficiencies in measurement capabilities or...
report 1981
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Vreeburg, J.P.B. (author)
De NLR-activiteiten betreffende micro-g vloeistoffysica worden gestructureerd en besproken. De ontwikkeling van dit type werk wordt met een schets van de chronologie geïllustreerd.
report 1982
document
Vreeburg, J.P.B. (author)
report 1984
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Vreeburg, J.P.B. (author)
A short description of experiment lES 330 and its supporting computer program is given. Difficulties with the execution of the experiment, and the most important results are indicated. The use of preliminary results for further validation of the computer program is illustrated. The main effort is presently directed towards the development of a...
report 1984
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Vreeburg, J.P.B. (author), Huijser, R.H. (author), Delil, A.A.M. (author)
A somewhat abstract discussion of measurement processes is used to construct a table wherein various techniques for fluid physics diagnosis are collected. The usefulness of each technique for certain types of measurement problems in microgravity fluid physics is assessed. Detailed discussions of applicable techniques are collected in Appendices....
report 1985
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Vreeburg, J.P.B. (author)
In the introduction of this Part the original objectives of the FPIS are recalled and the study strategy is indicated. Next chapters provide the logic and intermediate results as described in FPIS Final Report Part 1 System Aspects, Part 2 Detailed Design and Part 3 Breadboarding and Test Results. The final sections deal with important...
report 1985
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Vreeburg, J.P.B. (author)
report 1986
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Vreeburg, J.P.B. (author)
Experiments with liquid in microgravity started with tests to solve engineering problems. After the phenomenological experiments in Skylab and other vehicles, Spacelab provided dedicated multi-user facilities for fluid science research. In the space station era much more advanced equipment and operations are expected. This requires novel...
report 1986
document
Vreeburg, J.P.B. (author), Vogels, M.E.S. (author)
Experiment WL-FPM-08, or also: FLIM, has been executed in the FPM on the D-1 mission. The experiment is a continuation of an earlier one on Spacelab-1, and seeks to study capillary liquid flow in transparent models of spacecraft tanks. A typical dimension in a container is five centimeters. Six experiment runs have been conducted with liquid in...
report 1986
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Vreeburg, J.P.B. (author)
Experiment FLIM is a continuation of Spacelab-1 experiment IES-330 and is, likewise, executed in the Fluid Physics Module, FPM. Most results are obtained with container FLIM-1, one of three different transparent vessels partially filled with liquid. The interior volume of FLIM-1 is shaped as a circular cylinder, of height equal to radius, 25 mm,...
report 1986
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da Riva, I. (author), Martinez, I. (author), Martinez-Val, R. (author), Sanz, A. (author), Huijser, R.H. (author), Visser, F.B. (author), Vreeburg, J.P.B. (author)
The report presents a design study, within a specified envelope of resources, of laboratory for scientific research on fluid material in a space station, A survey of the scientific background of mlcrogravity experiments identifies candidate investigations. A structured description of available facilities, or earlier design studies, provides a...
report 1987
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da Riva, I. (author), Martinez, I. (author), Martinez-Val, R. (author), Sanz, A. (author), Huijsen, R.H. (author), Visser, F.B. (author), Vreeburg, J.P.B. (author)
Based on earlier designs for fluid science facilities, the elements of a FSL are derived. They have been grouped in classes, viz. experiment volumes and support elements. Each is described qualitatively, i.e. their features and required performances are discussed. The experiments are to be described with reference to a set of (5) canonical...
report 1987
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Martinez, I. (author), da Riva, I. (author), Martinez-Val, R. (author), Vreeburg, J.P.B. (author), Sanz, A. (author), Huijser, R.H. (author), Visser, F.B. (author)
The present part 2 of the Final Report presents an inventory of techniques that are likely to find application in the Fluid Science Laboratory. Part 1 of the Report contains a survey of the scientific disciplines that are indicated to provide investigations for the FSL. In the following Part 3, a preliminary synthesis of the content matter of...
report 1987
document
Vreeburg, J.P.B. (author)
An overview is given of fluid science investigations in microgee. Emphasis is placed on results obtained by European scientists. In order to assess the merits of experiments, particular aspects of the microgee environment will be discussed. The discipline is still very young, thence many qualitative investigations are necessary to identify...
report 1987
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