SEARCH · Search NASA
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.
Ionization phenomena in argon due to laser radiation by measuring electron density and energy as time function after laser pulse initiation at different gas pressures and preionized conditions
Ion pressure theory to describe steady state collisionless discharge
High oxygen at reduced pressure effect on metabolism of radioactive acetate in rats
Explore the source record for details and available documents.
Construction, testing, and refining of vacuum gauges - ionization gauge cross section ratios
Duct bends are designed in which pressure losses and velocity profile distortions due to centrifugal force gradients are significantly reduced. The correction is achieved by properly changing the cross sectional area through the bend without affecting the shape of the duct at the upstream and downstream sides.
Ionization gage behavior in various gas mixtures and atmospheric compositions
Excited state populations time dependence resulting from ion-electron recombination in He afterglow studied by emitted light relation to electron density
Explore the source record for details and available documents.
Method accurately measures the flow of gases produced by evaporation or sublimation at pressures approaching total vacuum. Measurement of heat rejection in terms of flow of steam is taken with water as the liquid undergoing change in phase.
Reducing the pressure in the vicinity of the arc attachment point by allowing the gas to flow through a supersonic nozzle minimizes local heating rates, prevents ablation, and increases the efficiency of coaxial gas-flow arcs.
Characteristics of Meinel systems excited by electrons and measurement of transition probabilities, excitation cross sections, and afterglow effects
Electron scattering effects in beam generated plasma
Visible and near UV spectra of vacuum Ar, Kr and Xe microwave discharge lamps with magnesium fluoride windows
Resistively heated strip specimens of Cb-1Zr alloy were exposed at 927 C in a vacuum chamber at various levels of total pressure in the 1-microtorr range and at various oxygen partial pressures in the .1-microtorr range. Oxygen reaction rates (sticking probabilities) were found to depend on whether or not the specimens were annealed immediately before the test exposure. It is shown that a normally undetectable oxide film exists on the Cb-1Zr surface as a result of oxidation by ambient air, and this film reduces the sticking probability as compared with a clean metal surface. The alloy is considerably strengthened by addition of oxygen to a level of about 6000 ppm, while still maintaining reasonably good room temperature ductility.
Explore the source record for details and available documents.
An abbreviated program was conducted to investigate igniter, injector, and thrust chamber technology for a 10.3 N/cm2 (15 psia) chamber pressure, 6660 N (1500 lbf) gaseous H2/O2 APS thruster for the Space Shuttle Vehicle. Successful catalytic igniter tests were conducted with ambient and cold propellants. Injector testing with a heat sink chamber (MR = 2.5, area ratio = 5.0) gave a measured specific impulse of 386 sec with 11% of the fuel used as film coolant. This coolant flow rate was demonstrated to be more than adequate to cool a spun adiabatic wall, flightweight thrust chamber.
There are no author-identified significant results in this report.