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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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An adjustable protractor facilitates transference of angles to remote machine tools. It has a magnetic base incorporating a beam which can be adjusted until its shadow coincides with an image on the screen of a projector.
Electric rocket test out of earth shadow - thor- agena launch of solar electric test satellite /set/ program
Presentation of theorems to extend a previous investigation of the cosmic-ray shadow cone and low-altitude main cone to include the main cone at all higher altitudes
Utilization of multiple foil insulation and shadow shields for the storage of cryogenic fuels in space
This investigation was concerned with a multiple aperture adaptive antenna system for application to receiving telemetered data from remote space vehicles or satellites. The primary criterion for determining the feasibility of such a system has been economic considerations, but of necessity many physical constraints imposed on both a single antenna and a multiple aperture system have been evaluated. These include such factors as acquisition and combining of signals, look angle, shadowing, propagation influences system spatial bandwidth, collimation, interference, doppler effects, reliability, and noise. Specific conclusions have been made for a system operating at a frequency of 2 Gc, but the system model adopted allows quick evaluation at other frequencies. At a frequency of 2Gc, the crossover point between a single antenna or a multiple aperture configuration occurs for an 85 foot reflector. However this transition region is not critical. For lunar range communications a single antenna appears to be the most economical, whereas at interplanetary ranges aperture equivalents of around 400 feet are required and achieved by arraying eight 142 foot antennas.
IR opacity of Jupiter outer atmosphere and IR ENHANCEMENT of satellite shadow, using limb darkening measurements
Cooling and reheating of Jupiter satellite Ganymede when disappearing and reappearing from Jupiter shadow observed at Palomar Observatory
Electron microscope method for measuring diffraction grating groove geometry in conjunction with fiber shadowing
Radar study of lunar surface - scattering of radio waves, polarization observations, shadowing effect on wave backscattering, and computer program for Haystack radar mapping
Theorems concering cosmic ray shadow cone extended to include main cone at higher latitudes
Three IBM 7094 computer. program used in the thermal design of spacecraft will be discussed. The first program is one used for integrating spectral reflectance or emittance. The second program calculates the percent time a satellite spends in the earth's shadow during a revolution about the earth. And the third program is called our General Space Thermal Program and is used to calculate satellite temperatures throughout a revolution about the earth.
Source distributions of UV and X-ray emission in corona and chromosphere determined from flight of spacecraft-borne instruments into Earth shadow
Cryodeposits effects on spacecraft thermal control systems with respect to surface radiative properties and to shadow shield surfaces
The analytical expression for the solar orientation error caused by planetary albedo is derived. A typical solar sensor output characteristic is assumed and a computer solution to the analytical is obtained. The computer results are presented for a spacecraft in the vicinity of Earth, Venus, Mars, and the Moon. Each planetary body is assumed to be a spherical diffuse reflector with cylindrical shadows and a constant albedo. The data generated herein permit the selection of an appropriate coarse-sensor to fine-sensor switching angle for solar orientation control systems and facilitate the the interpretation of solar-referenced scientific experiment data.
Errors in estimates of lunar crater slope angles and surface roughness in Ranger VII and Ranger VIII pictures due to interpretation of dark areas as shadows
Shadow equation for satellite, consistent ephemeris of major planets in solar system, correction process for lunar orbit, and numerical approximation of Hermite expansion
Magnetic field perturbations in lunar wake formed by dark side plasma shadow region due to solar wind interaction with moon
Apollo thermal control systems and concepts, discussing self shadowing