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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 865 records · Page 48
All sourcesNASA NTRSDOE OSTI
NASA NTRS1970

Kinetic inductance measured in a superconducting wire

Ultrasensitive technique to measure kinetic inductance has test specimen included as part of the inductance of a tank circuit of a tunnel diode oscillator. Frequency counter measures shift in frequency of oscillator, caused by changes in inductance. Frequency shift in tank circuit is proportional to change in kinetic inductance

Meservey, R. H.↗
NASA NTRS1971

Explosive bonded TZM-wire-reinforced C129Y columbium composites

Technique consists of positioning layers of TZM metal filaments between thin C129Y columbium sheets and joining multiple sheet stacks by single explosive joining operation. Metallurgical bonds are excellent, external heat is not required, process is relatively inexpensive, and resulting composites are considerably stronger than base alloy.

Reece, O. Y.↗
NASA NTRS1971

Hot wire measurements of freestream and shock layer disturbances.

Preliminary results of hypersonic helium tunnel investigations of whether disturbance measurements in the freestream alone are adequate to describe the model boundary-layer input disturbances, or whether the model shock wave changes the freestream disturbances before they reach the model boundary layer. It was found that the spectra in the freestream are typical of the wide band turbulence as it exists for sound radiated from a turbulent boundary layer. In the shock layer some redistribution of the spectra seems to occur, especially at the highest stagnation pressure, but the more interesting feature is the gradual development of a discrete component, around 70 kHz in the spectra. This feature is believed to be associated with boundary-layer transition.

Wagner, R. D.↗
NASA NTRS1971

Annealing effects in plated-wire memory elements. II - Recrystallization in Permalloy films.

Results of grain-size measurements in Permalloy platings suggest that recrystallization is possible at temperatures as low as 200 C, but that it is an extremely heterogeneous process. No worthwhile correlation was found to exist between observed grain size and magnetic dispersion in samples aged in the temperature range from 180 to 230 C. It is suggested that the magnetic aging which occurs under these conditions may be due to some other diffusion-controlled process than recrystallization; a process such as chemical homogenization is tentatively preferred.

Marquardt, S. J.↗
NASA NTRS1973

Summary of attitude dynamic analysis for IMP-J wire antenna spacecraft

The work is reported in the determination of acceptable deployment sequences, simulation of EFM antenna deployment, and contingency analysis for the IMP-J S/C. The spacecraft, mission profile and deployment sequences are described along with the simulation of EFM deployment and deployment failure.

Bell, L. W.↗