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.
Hydrogen vapor barrier materials measuring permeation rates, contraction and tensile properties from room to cryogenic temperatures
Improved, relatively low-cost method has been developed to produce porous metals with predetermined pore size, pore spacing, and density, utilizing powder-metal processes. The method uses angular not spherical tungsten powder.
Determining fugacities of hydrogen in hydrogen and propane mixtures using semipermeable membrane
Electrochemical cell constructed to measure membrane transport properties
Hydrogen and oxygen permeation rates through polycrystalline tungsten from 1300 to 2600 degrees C, obtaining permeation coefficients
Permeation rates for nitrogen through tungsten measured by gas chromatography at very high temperatures
Compilation of data on permeation of propellants and pressurant gases through metals, nonmetals, and composite materials
Apparatus for determining membrane transport properties under electrical, osmotic, and pressure effects
Separators and feedback systems of biological cells
Demineralizing gear pump system with mixed bed ion exchange columns for salt and volume transport experiment
Performance of membranes for transporting salt, ions, and water
Diffusive and electrical transport of KOH and dissolved ZnO through membrane bounded by concentrated KOH solution
Transport measurements through cation-exchange membranes by concentration clamp technique
A method is reported for evaluating transport experiments with membranes which is based on conservative fluxes, i.e. fluxes of quantities which do not vary across the membrane in the steady state. Conductance coefficients were calculated for the system: 0.05 N NaCl - C-103 cation-exchange membrane- 0.1 N NaCl. It is concluded that this method can be used to characterize any system of the type - solution-membrane-solution.
Unidirectional active and passive fluxes of K-42 and Na-24 were measured in red blood cells of ground squirrels (hibernators) and guinea pigs (nonhibernators). As the temperature was lowered, ?active' (ouabain-sensitive) K influx and Na efflux were more considerably diminished in guinea pig cells than in those of ground squirrels. The fraction of total K influx which is ouabain-sensitive in red blood cells of ground squirrels was virtually constant at all temperatures, whereas it decreased abruptly in guinea pig cells as temperature was lowered.
Material features combination of Mylar, for strength, and Saran, for impermeable qualities. Second lamination of Mylar prevents blocking, adds strength, and increases barrier rating. Different combinations of laminations produce variety of thicknesses and barrier ratings. Material can be metallized for increased barrier reliability and radar reflectivity, and can be treated with a heat-resistant coating.
Explore the source record for details and available documents.
Concept may make it profitable to obtain hydrogen fuel from water. Laboratory tests have demonstrated that method enables decomposition of water several orders of magnitude beyond equilibrium state where only small amounts of free hydrogen are present.