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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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Acceleration of charged particles in strong DC magnetic field by electrostatic waves with spatially varying phase velocities integrated numerically on IBM 360/65
VHF cavity backed cylindrical gap antenna input tuning impedance and equatorial radiation patterns controlled by cavity adjustments
Waveguide fed rectangular aperture antenna with dielectric plug load, describing admittance resonant perturbation due to excited TE mode
Modified Nielsen-type ion source produces temperatures up to 1500 degrees C and permits obtaining a plasma from low vapor-pressure materials. Design minimizes thermal stresses. Dual-filament discharge chamber achieves the high temperature and provides independent control of the heating and electron emission functions.
Electromagnetic wave obliquely incident upon plasma slab considered as boundary value problem
Equatorial patterns measurement of plasma covered axially slotted cylindrical antenna, describing discharge tube, facility and Langmuir probe survey of tube electron density
Energy dependence and threshold behavior of ion Ar lines excited in low-energy He ion-Ar collisions
Admittance measurements of rectangular or circular waveguide fed aperture antennas illuminating displaced metal plate
Apollo 12 lunar module impact laboratory simulation, investigating possible downrange ballistic effects and cratering process
Simultaneous X ray and optical observations of Scorpius XR-1, comparing rocket data from various flights
RAM C-3 S band diagnostic antenna systems and calculations of electron density profiles
Kinetic theory of electromagnetic waves obliquely incident upon plasma slab considered as boundary value problem
Bistatic radar scattering cross section from slightly rough perfectly conducting infinite surface, using Fourier transform
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An underwater sand height gage was investigated. This instrument consisted of two transducers, one screened and one unscreened. Laboratory experimentation included static and dynamic tests with three test sands--fine, medium, and coarse. Field tests were conducted at Rudee Inlet, Virginia Beach, Virginia. Test results showed a linear response to up to 10 inches of sand loading. Deviation observed in identical tests appeared to be due to variation in the density of sand. Density differences reflected varying packing styles which, in turn, were a consequence of grain size and flow regime. Further evaluations of the sand height gage reflect this instrument's potential.
Electron microprobe examination revealed that glassy lunar fragments had inclusions as well as boundaries between mineral glasses of different compositions. Glassy lunar spherules showed detectable heterogeneity less marked than that of the fragments. The room-temperature refractive indices and densities of the spherules are changed by heat-treating them at 500 to 700 C. The large increases (as much as 2% in density and 0.7% in index of refraction) are difficult to explain on the basis of classical glass-transition phenomena alone unless extremely rapid cooling rates are assumed. Further, the spherules darkened significantly when they were heated in air or a medium vacuum above 625 C.
The results of a material injection RF blackout alleviation experiment and of plasma diagnostic measurements using electrostatic probes and an S-band reflectometer in a 25,000 ft/sec reentry flight are presented. Significant alleviation of RF blackout is observed at altitudes of from 270,000 feet to 120,000 feet due to injection of water and Freon E-3 on VHF, S-band, C-band, and X-band frequencies. Electrostatic probe data, attenuation data, and S-band diagnostic data show consistent plasma results. The relative effectiveness of water and Freon E-3 is discussed.
Position and intensity measurements made with proportional counters in the 2 to 12 keV band are described. The instruments were launched from Johnson Atoll, and four scans were carried out during the 525 sec spent above 200 km. In comparing the results with the Uhuru survey, only a few differences are noted. One variable source, 2U 1908+0, was weaker. The case of the Magellanic Cloud sources is discussed.