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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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Influence of stress on corrosion behavior and mass transfer effect on refractory materials for advanced space power systems
Measuring apparatus for determining oxygen in potassium by bromine trifluoride method
Stress corrosion reflux capsule tests of niobium alloy in potassium
Magnetostriction device for studying cavitation damage resistance and high frequency fatigue of refractory alloys in high temperature liquid sodium
Solubility of pure iron, molybdenum, niobium, and tantalum in liquid potassium
Synthesis and characterization of vinylaromatic polymers
Laboratory methods to determine quantitative nitrogen, hydrogen, oxygen, and carbon impurities in sodium
Solution rates of pure iron and molybdenum in liquid potassium
Solubility parameters for niobium and zirconium in lithium and potassium, and calcium solubility in eutectic sodium potassium alloy
Evaluation of refractory alloys for containing liquid and boiling sodium
Vapor pressure, anode temperature, and inverse emission effects on thallium filled diode tested with barium cathode
Sodium-potassium seeded argon plasma in electric field measured for electrical conductivity
Metal corrosion effects in Rankine cycle lithium-boiling potassium test loop simulating working fluids of spacecraft nuclear turboplant propulsion system
The effects of a magnetic field on the superconducting transition in MoS2 intercalated with potassium and sodium were studied. It was found that the potassium intercalated MoS2 has better properties in a magnetic field. In zero magnetic field the transition to superconductivity begins near 6.4 K. Diagrams of the basic circuitry for superconducting transition studies, and charts showing critical magnetic field versus critical temperature for the intercalated MoS2 are included.
Theoretical calculations of the variation with pressure of small amplitude plane wave speeds are performed for sodium and potassium at zero temperature. The results obtained for wave speeds associated with volume dependent second-order elastic coefficients show better agreement with experimental data than for wave speeds associated with shear dependent coefficients. This result is believed to be due to omission of the band structure correction to the strain energy density.
Principal-series oscillator strengths and ground-state photoionization cross sections are computed for sodium, potassium, rubidium, and cesium. The degree of polarization of the photoelectrons is also predicted for each atom. The core-polarization correction to the dipole transition moment is included in all of the calculations, and the spin-orbit perturbation of valence-p-electron orbitals is included in the calculations of the Rb and Cs oscillator strengths and of all the photoionization cross sections. The results are compared with recent measurements.
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We report improvements in conversion efficiency for third harmonic generation in sodium and rubidium vapor. 30-psec pulses of radiation at 1.064 micron have been converted to 0.3547 micron with an energy conversion efficiency of 10%. Factors limiting conversion efficiency are discussed.