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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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Design and evaluation of nodding hyperboloidal subreflector in Cassegrainian antenna system used for millimeter wave radio astronomical observations
Comparison of electromagnetic and centrifugal pumps for cesium and potassium Rankine cycle systems
High temperature breakdown of cesium vapor through insulating material cracks
Dynamic model of Mars Mariner 1969 pressure regulator
Device for improving efficiency of parabolic reflector horn for linearly or circularly polarized waves
Semi-solid, dehydrated, rehydratable, thermally stabilized wet, and intermediate moisture food development for space flights
Dietary intake and adrenal cortex effects on diurnal rhythm of hepatic tyrosine transaminase activity and adrenal corticosterone content in rats
Beam switching Cassegrain antenna for millimeter wave radio astronomical measurements, describing RF and electronic systems
System has high radiation efficiency and minimal interaction between elements when inserted between a multimode, multifrequency transponder and a parabolic reflector in an airborne communications system.
Dynamic modeling of pressurization system and pneumatic pressure regulator in pressure fed liquid propulsion systems
Longitudinalfilm gate and lock mechanism for securing film in motion picture cameras under vibration and high acceleration loads
Development and verification of analytical model to predict cavitation compliance in turbopump designs
Space diets for maximum energy consisting of fats and proteins from biological systems and carbohydrates from chemical systems
NASA Office of Technology Utilization, examining publications, information sources, data processing and dissemination facilities
The results of experiments with dielectric obstacles of various geometries placed directly upon the apertures of circular and rectangular waveguides are presented. It is found that dielectric spheres, and in some instances dielectric cubes, two to four wavelengths in dimension produce directive patterns with low sidelobe levels. For some cross sections, the measured gain of these antennas is greater (6 dB in some cases) than that produced by optimum horns having apertures of identical cross section. The linearity of the polarization of these antennas is essentially the same as that of an open-end waveguide antenna.
Hyperfiltration of sodium chloride and urea was studied with porous glass membranes in closed-end capillary form, to determine the effect of pressure, temperature, and concentration variations, and lifetime rejection and flux characteristics. Rejection data for sodium chloride were consistent with the functioning of the porous glass as a low-capacity ion-exchange membrane.
The effects of external mechanical and climatic actions on the efficient operation of magnetic tape recording equipment are analyzed. The efficiency and reliability of the recording system are determined by the structural parameters and the characteristics of the individual elements of the transport mechanism circuit. The resistance of tape recording equipment to the effects of vibration is considered essential for reliable operations. Methods for insuring reliable tape transport and recording action are discussed.
The Apollo flight menu design is fully recounted for Apollo missions 7 through 17, to show modifications that were introduced to the Apollo food system, to document the range of menus and nutritional quality, and to describe packaging and preparation procedures for each class of food item. Papers concerning the Apollo 14 food system, and nutrition systems for pressure suits are included, and the following special topics are treated in depth: (1) food handling procedures; (2) modification of the physical properties of freeze dried rice; (3) stabilization of aerospace food waste; and (4) identification and quantitation of hexadecanal and octadecanal in broiler muscle phospholipids.