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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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Electrolytic etching process prepares surfaces of a stainless steel shell for reliable, high strength adhesive bonding to dielectric materials. The process uses a 25 percent aqueous solution of phosphoric acid.
Approximation solution to integral expressions of radar backscatter from distant rough surfaces for lunar surface property determination
Planetary albedo as affected by solar radiation reflected from surface of red clay soil or white quartz sand
Report presents test data on the bending fatigue life of notched sheet specimens. The influence of a surface irregularity on the fatigue life of a metal bellows is evaluated, with emphasis on accidental defects in ducting bellows which are impossible to avoid short of completely eliminating human contact.
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Oxygen recombination on various metal surfaces at low pressures
Satellite mass spectrometer measurements of metal surfaces interacting with oxygen atom at low pressures
Radial velocity errors in high dispersion astronomical spectrographs in terms of variable spectral shifts along plate produced by mirror surface irregularities
Interactions of atoms with space shuttle surface and methods for improving heat transfer
Potential energy surfaces for singlet states of H3/plus/
Compressive surface glazing for improved strengths of ceramic materials
Influence of surface films on plastic deformation of zinc single crystals during sliding
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The characteristics are affected by bubbles, and changes in these characteristics are functions of bubble size and configuration and internal and external bubble environments. Under certain internal bubble environmental conditions, the changes in the heat transfer characteristics were calculated.
The title problem was studied employing implicit finite-difference methods to obtain numerical solutions to a composite set of boundary-layer equations valid to second order. Results are given for flow up a two-dimensional cubic compression ramp for free-stream Mach numbers of 6, 8, and 12.25 and for free-stream Re/inch equal to 85,800 and 25,800 at a wall-to-stagnation temperature ratio of 0.223. Comparisons with independent theories and experimental results are given. Nonsingular separation was produced at a free-stream Mach number of 12.25. For all cases considered, displacement and curvature effects canceled one another when a consistent treatment of inviscid and viscous curvature corrections was employed - the second-order theory virtually reproducing the first-order results.
It was found that mechanical bending of CdS wafers with the (00.1) orientation causes pronounced changes in the contact potential difference. The changes were of the order of one volt. This effect was attributed to the polarization induced in the depletion layer by the mechanical stress. On this basis a model was developed which accounts for the experimental results.
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