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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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Gamma-ray shield that can be evacuated, refilled with a clean gas, and pressurized for exclusion of airborne radioactive contaminants effectively lowers background noise. Under working conditions, repeated evacuation and filling procedures have not adversely affected the sensitivity and resolution of the crystal detector.
Grain boundary migration in lead after repeated creep stress reversals
High gain self steering repeater for multibeam microwave array system for earth-satellite communications
Resting EEG and parieto-occipital response changes evoked by slowly repeated flashes in case of severe hypothyroidism secondary to panhypopituitarism
Advanced reconnaissance electric planetary spacecraft /AREPS/ concept for repeated coverage of Mars or Venus surface, using solar-photovoltaic system
Orbiting Data Relay Network communications system provides continuous wideband communication between ground and earth orbiting spacecraft via synchronous satellite repeaters
Repeated blood sampling effect on plasma cholinesterase, acid phosphatase, alkaline phosphatase and hematocrit ratios in domestic chickens
Molecular hydrogen-CO fuel cells operation, studying natural voltage oscillations due to repeated electrode poisoning and reactivation
Curve generator capable of producing precisely repeatable curve for any single-valued function of voltage versus time uses digital approach, implemented by means of clocked feedback shift register, large scale integrated circuit diode matrix comprising about 12,000 diodes, counter, and digital-to-analog converter.
Advanced reconnaissance electric planetary spacecraft /AREPS/ concept for repeated coverage of Mars or Venus surface, using solar- photovoltaic system
Synthesis of alpha-dichloro-seco-A-norcholestane from diol monoacetate reaction with triphenylphosphine followed by hydrolysis and repeated chlorination
S band communications repeater using retrodirective phased array on synchronous altitude data relay satellite /DRS/ for intersatellite and ground links
Metals low cycle fatigue resistance, discussing repeated plastic straining effect on mechanical properties
Glass bonding techniques for semiconductor strain gages, discussing outgassing minimization, hysteresis and repeatability and operational temperature range extension
Focal plane shutter assembly composed of three mechanically separate rotary shutters permits exposure of three separated photographic films simultaneously with exposure time of 0.08 second. Exposure time is repeatable within 2 percent, uniformity of exposure over all three films is within 5 percent.
Porous material thoroughly wetted with alcohol shows persistent wet line or area at locations of cracks or porosity. Inspection is qualitative and repeatable, but is used quantitatively with select samples to grade density variations in graphite blocks. Photography is employed to achieve permanent record of results.
Standard ''weldmatic'' spotwelder and tweezer-type welding head burns and vaporizes sheath material to expose undamaged thermocouple wire. Firing is repeated to remove additional sheathing and after three or four firings electrodes require cleaning.
Shutter design consists of two axially mounted spring driven rotating blades with two lenses mounted between the blades. Features include excellent repeatability and flash synchronization. Design permits packaging in small volume and is beneficial where focal distance, magnification, and exposure time are fixed.