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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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In open box beams subjected to torsion, secondary stresses arise owing to lateral bending of the spar caps. The present paper outlines a simple method for estimating the magnitude of these stresses and gives the results of tests of an open box beam in the neighborhood of a discontinuity where the cover changed from the top to the bottom of the box.
An innovative holographic memory system has been developed at JPL for high-density and high speed data storage in a space environment. This system ulitlizes a newly developed electro-optic (E-O) beam steering technology for beam steering to enable high-speed random access memory read/write without moving parts. Recently, a compact CD-sized holographic memory broadboard has been developed and demonstrated for holographic data storage adn retrieval. Detail technical progress will be presented in this paper.
The new 34-m beam-waveguide (BWG) antenna at Goldstone has a beam magnifier ellipse below ground level that transforms a 22-dB gain feedhorn into a high-gain 29-dB gain pattern for input to a standard four-mirror BWG system. It was initially designed for the X- an Ka-bands, and has a loss of less than 0.2 dB.
Effects of variable-energy electrostatic rocket-engine ion exhaust beams that pertain to the design of high-vacuum condensers are discussed. Three ion-engine beam sources, using cesium and mercury as propellants, were operated at energy levels of 200 to 9000 electron volts and currents of 0.002 to 0.200 ampere. Five condenser geometries, having surface areas from 0.287 to 5.76 square meters, were tested. Values for a function of the accommodation and condensation coefficients, which appears in an existing theoretical analysis, were determined. Although exhibiting rather wide variations in some tests, the values were estimated at approximately 0.15 for cesium and 0.015 for mercury. A method of estimating condenser surface area requirements is given.
High energy, high intensity molecular beam flow is analyzed, using a skimmer which is a small inlet where the beam is separated from the core flow
Static theory of beam-generated plasma derived for beams filling space between two plane conducting walls, predicting plasma density and potential distribution
Glass fiber reinforced box beam - load test comparison with aluminum box beam
Beam generation emphasizing free jet behavior, skimming process and feasibility of molecular beams from continuum sources
Continuum source molecular beam facility, examining effect of source-skimmer distance variation on flux and spatial distribution of beam in collimation chamber downstream
Molecular beam research - square-wave phase modulation in molecular beam resonance studies and search for shift in transverse electromagnetic mass of electron
Nozzle type molecular beam measuring distribution of speeds after scattering incident beam from solid surface
Beam equation for elastically supported clamped- clamped beam solved for conditions of initial, boundary and distributed load, using Hermitian operator
Optical beam deflection method based on polarization change of acoustically deflected light as compared to incident beam
Equilibrium of magnetic field confined by impact pressure of beam of ions for general direction of incidence of beam
Electron beam analysis of skimmer influence on nozzle beam formation
Coherent high power millimeter and submillimeter wave generation by various free electron beam devices, noting periodic beam has greatest development potential
Portable instrument passes light from helium-neon laser at a wavelength of 3.39 microns through the atmosphere being monitored and measures attenuation of the laser beam. Since beam attenuation is due almost exclusively to absorption of radiation by hydrocarbons, a quantitative measure of their concentration is available.