On maintaining the meteoritic complex
Ecology of meteoritic material in solar system involving immediate origin and dissipation
SOLAR SYSTEM↗
SEARCH · Engineering Papers
Results for “maintainability”
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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Vent and relief valve maintains low leakage rate over broad temperature range
Low leakage rate, large diameter vent and relief valve operates satisfactorily over a large temperature range by a design that accommodates waviness and distortions due to thermal gradients. It is based on a fixed sealing member having an inclined lapped surface to which a flexible flow gate conforms.
Weitenbeck, R. G.↗
Apollo spacecraft reliability program control - An important aspect in maintaining a balanced reliability program
Program control methods for reliability of Apollo spacecraft systems
Levine, J. H.↗
Maintainability of Manned Spacecraft for Long-duration Flights
Maintenance task analyses and expendables data on long duration, manned spacecraft flights
Source record↗
NASAP - Present capabilities of a maintained program.
NASAP /Network Analysis for System Application Program/ functions capabilities
Happ, W. W.↗
A sampled-data regulator for maintaining a constant alveolar carbon dioxide.
Sampled-data regulator for investigating both steady-state and transient responses of respiratory system of humans to reduced oxygen at fixed levels of carbon dioxide
RESPIRATORY SYSTEM↗
Control for maintaining constant level of a cryogenic liquid
Pressure formed as the cryogenic liquid vaporizes is used to pump new cryogenic liquid from a storage reservoir. Changes in volume of a gas resulting from changes in temperature actuate a valve which either replenishes the depleted liquid in the vessel or vents the evolving gas to the atmosphere.
Liberotti, J.↗
Study of the astronaut's capabilities to maintain life support systems and cabin habitability in weightless conditions. Mod 3. A new technique for investigating cargo transfer in simulated weightless environments
Simulation of cargo transfer in weightlessness environment
Loats, H. L., Jr.↗
Methods of achieving and maintaining physical fitness for prolonged space flight Progress report, 1 Jan. - 31 May 1968
Experimental study of effects of variable-length training sessions on physical fitness in college men
Olree, H. D.↗
A sampled-data regulator for maintaining a constant alveolar CO sub 2.
Sampled data regulator for maintenance of constant alveolar carbon dioxide during steady state and transient ventilatory responses to hypoxic stimulation
Coleman, T. G.↗
Maintaining thermal control in Mariner 4
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Lewis, D. W.↗
A study of bone mineral content performed by the gamma ray absorption technique in prolonged bed rest subjects maintained in a metabolically controlled environment - The ultimate application of gamma ray absorption techniques to in-flight bone mineral measurements, exhibit B Terminal report
Bone mineral changes in prolonged bed rest subjects determined by gamma ray absorption technique
Vogel, J. M.↗
Office of Tracking and Data Acquisition maintains lifelines to space missions
NASA Office of Tracking and Data Acquisition mission support and ground and spacecraft communication networks
Brockett, H. R.↗
Avoidance behavior maintained by artificial gravity with variations in rotation rate and radius
Increased artificial gravity avoidance by squirrel monkeys with variations in rotation rate and radius
Belleville, R. E.↗
Long-life, space-maintainable nuclear stage regulators and shutoff valves
The six most promising valve, regulator, and remote coupling concepts, representing the more radical designs from twenty concepts generated, were investigated. Of the three valves, one has no moving parts because shutoff sealing is accomplished by an electromagnetic field which ionized the flowing fluid. Another valve uses liquid metal to obtain sealing. In the third valve, high sealing forces are generated by heating and expanding trapped hydrogen. The pressure regulator is an electronically controlled, electromechanically operated, single state valve. Its complexity is in electronic circuitry, and the design results in less weight, increased reliability and performance flexibility, and multipurpose application. The two remote couplings feature the minimization of weight and mechanical complexity. One concept uses a low melting temperature metal alloy which is injected into the joint cavity; upon solidification, the alloy provides a seal and a structural joint. The second concept is based on the differential thermal expansion of the coupling mating parts. At thermal equilibrium there is a predetermined interference between the parts, and sealing is achieved by interference loading.
Source record↗
Maintainability of the Space Shuttle Orbiter main engine.
Review of the long-life and minimum-turnaround-maintenance features in the design of the Space Shuttle Orbiter main engine aimed at reducing the latter's field operating costs. These features include the regeneratively cooled hot-gas system selected, the provision of additional fatigue margins in the design of rotating machinery elements, and employment of a proven approach to engine condition monitoring for fault detection and identification.
Goe, R. T.↗
A reliability, cost and risk analysis of establishing and maintaining a space communications satellite network.
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Greenberg, J. S.↗
Maintenance and maintainability of large booster systems
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Lange, O. H.↗