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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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At least 307 records · Page 17
All sourcesNASA NTRSDOE OSTI
NASA NTRS1962

Fixed-Base Simulator Studies of the Ability of the Human Pilot to Provide Energy Management Along Abort and Deep-Space Entry Trajectories

A simulation study has been made to determine a pilot's ability to control a low L/D vehicle to a desired point on the earth with initial conditions ranging from parabolic orbits to abort conditions along the boost phase of a deep-space mission. The program was conducted to develop procedures which would allow the pilot to perform the energy management functions required while avoiding the high deceleration or skipout region and to determine the information display required to aid the pilot in flying these procedures. The abort conditions studied extend from a region of relatively high flight-path angles at suborbital velocities while leaving the atmosphere to a region between orbital and near-escape velocity outside the atmosphere. The conditions studied included guidance from suborbital and superorbital aborts as well as guidance following return from a deepspace mission. In this paper, the role of the human pilot?s ability to combine safe return abort procedures with guidance procedures has been investigated. The range capability from various abort and entry conditions is also presented.

PILOT↗
NASA NTRS1964

Simple circuit provides adjustable voltage with linear temperature variation

A bridge circuit giving an adjustable output voltage that varies linearly with temperature is formed with temperature compensating diodes in one leg. A resistor voltage divider adjusts to temperature range across the bridge. The circuit is satisfactory over the temperature range of minus 20 degrees centigrade to plus 80 degrees centigrade.

Moede, L. W.↗
NASA NTRS1963

THE COMBINED USE OF LIQUID AND GASEOUS HELIUM TO PROVIDE NEAR ACTUAL SPACE ENVIRONMENT

Because of the extremely low density of the gas in Interplanetary space, the most important remaining mode of external heat transfer Is radiation. Studies of this phenomenon in its multiple ramifications are being made presently and will continue In both theoretical and experimental areas. These experiments should, most desirably, be made under conditions which duplicate outer space; otherwise, errors may be introduced which cannot be estimated and will only be discovered in the actual environment. Many facilities are presently available which will reproduce the space environment only approximately[1,2]. The facility which will be discussed here has as its goal, at least for the phenomena connected with radiation heat transfer, the provision of conditions in space as accurately as they are known. The conditions to be reproduced are: (1) the solar electromagnetic radiation spectrum; (2) the low pressure and density of space (∼10-14 mm Hg); and (3) the black radiation sink of space (4°K).

LIQUID HELIUM↗
NASA NTRS1964

Transistorized converter provides nondissipative regulation

A transistorized regulator converter efficiently converts fluctuating input voltages to a constant output voltage, avoiding the use of saturable reactors. It is nondissipative in operation and functions in an open loop through variable duty cycles.

Source record↗
NASA NTRS1965

Ion pump provides increased vacuum pumping speed

Multiple-cell ion pumps with increased vacuum pumping speed are used for producing ultrahigh vacuums in vacuum tubes and mass spectrometers. The pump has eight cathode-anode magnetron cells arranged in a cylinder which increase the surface area of the cathode.

Source record↗