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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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Dissimilar metals are reliably joined by diffusion bonding when the surfaces are electroplated with silver. The process involves cleaning and etching, anodization, silver striking, and silver plating with a conventional plating bath. It minimizes the formation of detrimental intermetallic phases and provides greater tolerance of processing parameters.
Computer program VARI-QUIR 3 provides Gauss-Seidel type of solution with inner and outer iterations for steady-state, multigroup, two-dimensional neutron diffusion equations. The program has no restrictions on any of the input parameters such as the number of groups, regions, or materials.
Lithium hydride cell uses vanadium diaphragm electrode as a hydrogen diffuser. Vanadium is high in hydrogen gas solubility and permeability, is least sensitive to adverse surface effects, maintains good mechanical strength in hydrogen atmospheres, and appears to be compatible with all alkali-halide electrolytes and lithium metals.
Solubility and diffusion of oxygen in refractory metals measured by electrical resistivity
Onset of anomalous diffusion in electron- bombardment ion thrustor
Effect of negative ions on diffusion of charged particles in lower ionosphere
Kinetic theory of bimolecular chemical reaction and diffusive drag in gas mixtures
Diffuse X-ray scattering measurements from nickel-palladium single crystals to determine relation between physical and thermal properties and local atomic arrangements
Diffusion of heavy ions in solar corona studied with one-fluid and two-fluid dynamic models
Lithium-diffuse semiconducting silicon solar cells
Ultrahigh vacuum technology including cryopump, getter ion pump, diffusion pump, and pressure standardization studies
Ozone effect on stability of Dc-704 fluid in diffusion pump vacuum system
Diffuse spectral reflectance of optically thick cloud and powder layers composed of particles with strong IR resonance, noting effect of particle size
Ablative behavior of low and high density phenolic nylon in diffusion controlled surface combustion regime
Surface pressure spatial correlation function for rigid infinitely long cylinder in three- dimensional diffuse sound field
Diffusion model of perceptual memory process when observer compares two consecutive stimuli, noting visual and auditory discrimination