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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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Manufacturing process prevents damage to hermetically sealed nickel-cadmium secondary cells by buildup of gas pressure during overcharging and reversed charging conditions. The cells are manufactured with less charge capacity in the positive electrode than in the negative electrode, and two additional electrodes are added.
Metal boot splices hard sheathed instrumentation cables used with high temperature strain gages and thermocouples. Silver brazing the conductors together, hermetically seals the splice. This boot is a highly reliable sealed splice which is equally effective at cryogenic temperatures, high temperatures, nuclear environments, and combinations of the above.
Confinement of fish in hermetically sealed aquariums with and without Chlorella
Electrically or hydraulically powered, hermetically sealed angular or rotary actuator deflects mechanical members over a range of plus or minus 180 degrees. The actuator design provides incremental flexures which keep the local deflection rate within elastic limits.
Manufacturing methods, cost estimates, advantages, and limitations of various types of hermetic seals for secondary alkaline spacecraft cells
Leakage rate limits of hermetically sealed spacecraft electronic components, and correlation of radioactive gas and helium mass spectrometer detection methods
Mechanically simple, hermetically-sealed pump utilizes pumped fluid for lubrication. The rotor, having helical grooves on the outer surface, functions as both a bearing and pump.
Review of state of art of hermetic seals for secondary alkaline spacecraft cells
Halogen detector for leakage in hermetically sealed devices
Hermetic induction motor-driven pump for Brayton cycle heat rejection loop
Wet slug tantalum capacitors exhibiting hermeticity and resistance to reverse voltage
Resonant piston compressor for recirculation system of hermetically sealed platform
Process variables associated with manufacturing hermetically-sealed nickel-cadmium cells
Transmitter allows transmission of rotational or single planar arc motion through hermetically sealed chamber without use of dynamic seals or complex mechanisms. Device may interest pressure vessel designers and those who need to isolate equipment from a hostile environment.
Hermetically sealed explosive release mechanism for actuator device
Method for locating leaks in hermetically sealed containers
Hermetically sealed vibration damper design for use in gimbal assembly of spacecraft inertial guidance system
A program to determine and study the critical process variables associated with the manufacture of aerospace, hermetically-sealed, nickel-cadmium cells is described. The determination and study of the process variables associated with the positive and negative plaque impregnation/polarization process are emphasized. The experimental data resulting from the implementation of fractional factorial design experiments are analyzed by means of a linear multiple regression analysis technique. This analysis permits the selection of preferred levels for certain process variables to achieve desirable impregnated plaque characteristics.