SEARCH · Engineering Papers
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.
Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.
Specimen thermionic emitters were electropolished and electroetched to study the effect of surface preparations on improving thermionic emission. The best technique found was to electropolish the annealed rhenium surface and then electroetch it. The effect of electroetching was to remove other crystal planes faster than basal planes.
Factors affecting fatty acid synthesis in cell free preparations from Saccharomyces cerevisiae
Temporal bone preparation for investigating inner ear end organ function and morphology correlation
Preparation of microscopic cross section of uranium 235 for high temperature reactor calculations
Guideline for contractor quality program plan preparation
Tungsten diboride preparation and structure
Terrestrial test sites and aircraft flights used in preparing for remote sensing from Earth orbital spacecraft
W-diffusion bonding in preparing segmented silicon-germanium-lead telluride thermoelements, noting properties
Effects of tissue preparation and extractive procedures on the intensity of radioautographic labeling are presented in terms of mean grain count per cell in cells labeled with tritiated precursors of proteins or nucleic acids. This information would be of interest to medical researchers and cytologists.
Preparation of a xenon hexafluoride and sodium fluoride salt yields a sample of the highest possible purity for use in thermal measurements. The desired hexafluoride can easily be freed from the common contaminants, xenon tetra-fluoride, xenon difluoride, and xenon oxide tetrafluoride, because none of these compounds reacts with sodium fluoride.
Uranium, thorium, and plutonium are effectively prepared by magnesium-zinc reduction, using uranium oxides, thorium dioxide, and plutonium dioxide as starting materials. This technique is also useful in performing reduction of metals such as zirconium and titanium.
Preparation of electron probe microanalyzer standards using rapid quench method
Mission design, operations planning and flight preparation for manned orbital space missions
Catalytic decarboxylation of oxaloacetic acid into pyruvic acid by thermally prepared poly-alpha- amino acids
Thin self-supporting beryllium foils preparation for use as atomic and molecular ion beam targets
Apparatus is used to prepare isotopically pure magnesium isotope-24, suitable for use in neutron scattering and polarization experiments. The apparatus permits thermal reduction of magnesium-24 oxide with aluminum and calcium oxide, and subsequent vaporization of the product metal in vacuum. It uses a resistance-heated furnace tube and cap assembly.
Study of surface preparations and surface contamination effects on the welding of 2014 aluminum involves several methods of surface analysis to identify surface properties conducive to weld defects. These methods are radioactive evaporation, spectral reflectance mass spectroscopy, gas chromatography and spark emission spectroscopy.
Improved scarfing tool consists of a mount-table, roller-guided assembly. It converts a conventional routing machine for relatively precise field preparation of pipes for welding.