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Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
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Analysis is guideline in examining component materials, analytically determining physical properties and chemical compositions, and developing control data necessary for ascertaining effects of environments and their influence on deterioration and degradation mechanisms.
SNAP-8 boiler performance degradation and two phase flow heat and momentum transfer models
Thermodynamic processes related to pollution and environmental degradation
Open circuit and bias degradation tests in copper and cadmium sulfide thin film solar cells
Effect of cell vintage and certain testing procedures on degradation of cadmium sulfide thin film solar cells
Degradation of hydrocarbon polymers by exposure to 275 F for 400 hours in presence and in absence of ammonium perchlorate
Thermal degradation profile of 25 selected polymeric spacecraft materials
Vacuum UV degradation of thermal control coatings on ATS-1 satellite, comparing with laboratory simulation
Copper sulfide-cadmium disulfide thin film solar cells degradation under simulated orbital conditions, determining electrochemically induced copper filament growth as electric shorts causes
Ti-Ag and Ti-Pd-Ag solar cell contacts structure and degradation dependence on high temperature and humidity environmental exposure
Solderless Ag-Ti solar cell contacts humidity degradation mechanism
Polyphenylene thermal degradation and curing, discussing pyrolytic effects of chlorine and polynuclear structure
Lunar dust reflectance degradation of thermal control paint on Surveyor 3 TV camera, separating solar radiation effects by analytical model
Dipeptidyl aminopeptidase I /cathepsin C/ properties, subcellular localization and polypeptide degradation in rat liver and bovine spleen and pituitary glands
Polymer thermal degradation theory of pressure sensitive hybrid combustion, calculating linear regression rates
The use of solar electric propulsion to raise a high-power communication satellite from a low altitude, inclined circular orbit of the geosynchronous orbit is evaluated. Since the satellite ascends through the high intensity radiation belts, the power available from the solar array and therefore to the ion thrusters degrades. The performance of the solar electric stage in combination with the thrust augmented Thor/Delta launch vehicle is evaluated for two thrust steering programs. The transfer times and solar array requirements are presented for total geosynchronous payloads from 450 to 1100 kg.
The solubility and/or swelling of cured epoxy resins was studied using the solubility parameter method. Determination of solubility parameters were found in order to select solvents for solvent-assisted degradation of cured epoxy polymers used in spacecraft. A method for improving recovery of seeded spores is suggested for assay of buried contaminants. Three commercial epoxy resins were cured using four different alkyl amines. For each resin-amine combination, three levels of amine were used, corresponding to 1/3, 2/3, and all of the amine required to react with the oxirane groups of the resin. The solubility parameters of the 36 resulting model compounds were determined in poorly and moderately hydrogen-bonded solvents. No strongly hydrogen-bonded solvents caused dissolution or swelling. The tolerance of cured resins is discussed in terms of polymer structure.
Experiments were conducted to determine the effects of microorganisms, substrates, pressures, humidities, and oxygen concentrations upon aluminum corrosion. In addition, the effects of microbes upon coated and treated aluminum were examined and an attempt to correlate aluminum in solution with degradation of the samples was undertaken. The organisms, humidities, oxygen levels, and substrates all played a major role in the corrosion of aluminum. Quantitation of aluminum losses indicated that the total metal losses from inoculated samples were significantly greater than those of the uninoculated samples.