Atmospheric sciences for the space age
Space-age research programs to increase knowledge about global atmospheric circulation and to obtain data on changing weather patterns
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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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Space-age research programs to increase knowledge about global atmospheric circulation and to obtain data on changing weather patterns
Program for computing neutron ages from experimental activation data
Aluminum-26 in iron meteorites, and their cosmic ray exposure ages
Rubidium-strontium ages of chondrules and carbonaceous chondrites
Stellar evolution and evolutionary sequences, use of high speed computer methods and application to age determination of stars
Lower limit of age of cosmic ray nuclei, flux ratio of Be nuclei to B nuclei and intergalactic cosmic ray propagation
Hertzsprung-Russell diagram calibration in terms of age and mass for main-sequence B and A stars
Narrative dealing with space age effect on national character
Factors contributing to ballistocardiographic waveform in healthy middle aged males
Flight control problems and techniques in space age
Age and helium content correlations from recent mass determinations of two low mass binary star systems used in stellar evolution theory
Loss structure models concerning age replacement policies, discussing mathematical aspects of maintenance with dynamic programming formulation
Al 26 content of stony meteorites by coincidence spectrometry noting cosmic ray exposure ages for eight meteorites
The specific experimental investigation undertaken was designed to answer these questions on Ti-6Al-4V in the solution treated and aged condition. The defect growth and fracture characteristics were studied in parent (unwelded) and welded sheet material. The results of the study indicate that cryogenic proof testing will screen smaller size defects than proof testing at ambient conditions. However some unusual crack growth behavior during the proof test simulation suggests that some further study be made of stress and time duration effects.
Fatigue crack propagation and fracture toughness characteristics of 7079 aluminum alloys in underage, peak age, and overaged conditions
Ages for D-D and D-T neutrons in water and tungsten-water mixtures
Ages of calcium-rich achondrites determined by study of 27 eucrites and shergottites