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This paper summarizes work in progress in three different areas: 1) a framework for the design of higly reliable and higly available space avionics systems; 2) distributed reliable computing architecture; and 3) Guarded Software Upgrading (GSU) techniques for software upgrading during long-term missions such as the Pluto/Kuiper missions.
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Explore the source record for details and available documents.
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Effect of systematic training on tolerance of white rats to prolonged hypodynamia and isolation
Resistance of bacterial endospores to unfavorable environment - tolerance of space environment
Death rates of microorganisms deposited on surfaces of stainless steel and electronic components by handling and aerial fallout - Decontamination techniques
Amino acid sequence of ferredoxin used for determining its evolutionary history
Seed germination and seedling growth dependence on oxygen, noting microaerobic capabilities among vascular plants, water effect, etc
Early Orbital Space Station mission reliability in artificial gravity mode
Computer programs for analysis and evaluation of payload and landing system structures for soft landing of instrument packages
Linear acceleration effects on semicircular canals in elasmobranch fishes
Two computer programs for investigation of wide variety of legged planetary landing gear configurations
Results from the Goddard balloon spectrometer and the results reported by Soviet scientists using the Proton series of satellites are summarized. The important experimental results from the balloon spectrometer experiment are as follows: (1) On a total-energy scale, protons constitute only a minor proportion of the cosmic rays, only 20 percent. The rest of the cosmic rays are complex nuclei. (2) All the nuclei have the same power low spectrum in total energy and so the composition seems to be independent of energy.
Two methods of analysis have been developed for legged planetary landers. The first of these, the Large Displacement Gear Analysis, is a design tool for statically determining the large displacement stroking behavior, energy absorption characteristics, and internal load distributions in a single gear. The second, the Landing Dynamics Analysis, predicts the spatial landing dynamics of a legged lander. Effects of structural flexibility, elastic-plastic gear load characteristics, and soil properties on the loads, motions, and stability of the lander may be determined. Validation of the analytical techniques is accomplished through comparison of predicted results and experimental data obtained during a model test program.