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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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Improvement in sensitivity of holography, the technique of lensless interferometry, is obtained by enhancing the higher-order structure in the interferogram. By using the light diffracted into higher orders than the first, phase sensitivity is increased over the first order sensitivity by a factor equal to the order number used.
Size effect on tensile strength of polycrystalline nickel wires
Heat transfer to windward side of scale model for graphite lunar module fuel cylinder
Rocket measurements of primary auroral particles energy spectra indicating spectral structure acceleration peaks associated with electrostatic fields
Flash freezing process yields gelling agent for use at cryogenic temperatures. Vaporized material, diluted with an inert gas, is injected below the surface of an agitated cryogenic liquid. This method disperses particles of chlorine trifluoride in liquid oxygen difluoride.
Coherent precipitates effect on explosive shock hardening of pure nickel and Inconel alloy sandwich assemblies determined from simultaneous shock loading at specific pressures
Rarefied gas flow through ultrafine porous filtering media used to predict flow rate
Determining presence of porphyrins in Apollo 11 and 12 soil samples by fluorescence spectrometry and analytical demetallation
Optical and radio frequency electrical properties and grain size analyses of Apollo 11 and 12 lunar soil samples
Tensile, fatigue, and creep rupture properties of extruded nickel-based aluminum, titanium carbide, and beryllium oxide alloys and aluminum-based silicon, copper, and iron alloys
Short term pure oxygen exposure effects on rats proximal convoluted tubular cell structure
Apollo 11 and 12 lunar soil samples common contaminant identified as diisopropyl disulfide, using chromatograph mass spectrometer
Lunar glassy objects and mineral grains surface microstructure by optical and scanning electron microscopy, comparing with tektites and terrestrial volcanic analogs
Apollo 11 and 12 lunar dust and rocks, determining Be and Cr contents by gas chromatography for comparison with crystalline rocks
Using a new technique of directly measuring the intensity variation from the 16mm time-lapse filtergram movies taken in the blue wing and in the line center of H-alpha, periodic intensity oscillations were found in the center of H-alpha supergranulation network, in rosette centers, and in plage granules. The oscillatory period of intensity in the network is of the order of 170 + or - 44 seconds while in regions of stronger magnetic field, such as in plages and in rosettes, the period was found to be longer, on the order of 300 + or - 50 seconds. It is suggested that observed intensity oscillation in the rosette center is related to the shooting out of dark mottles from rosettes. Oscillatory intensity fluctuations were also observed in the sunspot umbra.
Studies were made on the electrolysis of a molten BeCl2-NaCl bath using a mercury cathode and beryllium anode. A quasi-amalgam was obtained. The beryllium was consolidated by direct hot pressing of the amalgam at temperatures in the range of 800 C and using pressures of 5,000, 10,000 and 20,000 psi. The work confirms the ability to produce ultrafine beryllium particles by electrolysis.
Study of the physical characteristics of the H alpha structures previously defined as fibrils and threads. The interpretation of the fibrils as ends of flux tubes is useful in tracing the behavior of the transverse field component over the solar surface. The observed properties of fibrils and threads are consistent with the hypothesis that they are produced by a shock wave mechanism similar to that advanced by Parker (1963) to explain spicules. It is suggested that the undisturbed magnetic field in the chromosphere of an active region is confined to a thin sheath, while the field of the quiet regions extends into the corona.