Experimental Investigations to Support a Multi-Layer Deployable Membrane Structure for Space Antennae
Bibliographic record
Abstract
This paper presents an investigation into the properties of membrane structures for space-based antenna applications. Various experimental activities that have been undertaken at the early phase of development of a multi-layer, deployable membrane structure are outlined. The membranes described here are prototypes for the development of a possible on-orbit flight experiment in thin structure deployment, where such an experiment addresses necessary questions related to the use of this technology for membrane synthetic aperture radar. The shape of the membrane surface in its deployed state was selected based on optimized equations that determined which planar membrane shape would distribute the tension of the structural boundary evenly throughout the deployed surface. A campaign to measure the variations in membrane flatness in response to thermal input was carried out for a single membrane layer. The results of these flatness experiments contained significant temporal variation, which prompted an investigation of material creep in the membrane material. Concurrently, the microplasticity of the membrane material was also investigated experimentally, in order to be able to better predict the flatness variations which would result from the stowage of the structure prior to deployment. Two types of thin material film were considered for the membrane structure, due to significant differences in their dielectric properties and the reaction of the materials to atomic oxygen. Experimental results are reported for structures made of each of these materials whenever possible. It is expected that the stowage and deployment method, as well as the tensioning system for the multi-layer membrane once deployed, will depend on the results of these investigations of fundamental properties.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.001 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.001 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".