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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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Low effective resistivity of gold film plated onto tin determined by low temperature microwave absorption measurement and explained by free- electron model and superconductivity proximity effect
Interaction energy of single atom adsorption at any point on single crystal planes of bcc structure, using Lennard-Jones potential
Measurement of radiation reflectively scattered from optical surfaces in far UV, noting role of overcoating with metal films
Proline residue effects on hydrolysis of peptide bonds by thermolysin
DC beam experiment for determining molecule sticking coefficients of gas beams incident on Ti, Ba and Sr gettering surfaces at cryogenic temperature
Chemostat culture method for studying control mechanisms during utilization of glucose/lactose and glucose/L-aspartic acid by populations of Escherichia coli
Semitransparent Pt film reflectance in vacuum UV evaporated on glass, quartz, Al, Au and Cr on glass compared with opaque films
Refutation of Sylven-Snellman report of catalysis of benzoylarginine beta-naphthylamide and leucine beta-naphthylamide hydrolysis by beef spleen cathespin B
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Molybdenum disulfide films 300 to 400 A thick were rf sputtered on aluminum and nickel surfaces at elevated, ambient, and liquid nitrogen temperatures. Electron transmission micrographs and electron diffraction patterns were taken to determine the structural growth. These transmission micrographs revealed that sputtered MoS2 films at ambient and elevated temperatures (320 and 150 C) formed an irregular network of ridges. The electron diffraction patterns of these films showed relatively sharp diffraction rings, indicating crystallinity. The transmission micrographs of sputtered films at liquid nitrogen temperatures revealed a continuous featureless film. The electron diffraction patterns showed broad, diffused rings indicating an amorphous film. The transmission micrographs of a post-annealed (425 C) MoS2 film sputtered at liquid-nitrogen temperature revealed the tendency for ridge formation. Electron diffraction patterns also showed increased sharpness of the diffraction rings. Friction tests showed that MoS2 films deposited at ambient and elevated temperatures exhibited good lubricating properties. The MoS2 films deposited at cryogenic temperatures had no lubricating characteristics.
The use of aluminum beam lead devices in hybrid circuits is described by modification of existing processing equipment. Principles, procedures, and methods of application of Al beam lead devices are discussed in terms of processing the devices onto hybrids.
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The growth of single crystals in a space environment is discussed. Several crystals which could be beneficially grown in weightless conditions are identified. For surface wave acoustic applications, the surface perfection and internal crystal perfection which are obtainable in space, are favorably indicated.
A novel process for the preparation of improved cadmium electrode plaques with precisely controlled pore size and porosity is described. The requirements for these plaques include far better uniformity, reproducibility, and life than is currently available with conventional materials. The key features of the work were preparation of plaques via a powder metallurgical technique which consisted of isostatically compacting a blend of a nickel powder with a fugitive pore-former and subsequently sintering the 'green' compact. Cadmium electrodes were prepared from these materials and were cycle tested in negative-limited cells using an accelerated, torturous test regime. Results were obtained which showed the new structures yielded electrodes that were superior to the conventional structures in mechanical properties and performance.
Measurements of crystalline sizes during nucleation of gold on mica surfaces cleaved in ultra-high vacuum (UHV) reveal the presence of symmetric, sharply peaked distributions which flatten and broaden with increasing nucleation time. When the number density of nuclei increases, the growth rate is suppressed. The time taken to reach a given size increases with increasing temperature when the nuclei are growing as isolated particles. When the nuclei are spaced so far that their diffusion fields overlap, then the time taken to reach a given size decreases with increasing temperature.
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