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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 253 records · Page 14
All sourcesNASA NTRSDOE OSTI
NASA NTRS1993

Optical Properties of Semiconductor-Metal Composite Thin Films in the Infrared Region

Germanium:Silver (Ge:Ag) composite thin films having different concentrations of Ag, ranging from 7% to 40% have been prepared by dc co-sputtering of Ge an Ag and the films' surface morphology and optical properties have been characterized using transmission electron microscopy (TEM) and infrared spectrophotometry. It is seen that while the films containing lower concentrations of Ag have island-like morphology (i.e. Ag particles distributed in a Ge matrix), the higher metallic concentration films tend to have symmetric distribution of Ag and Ge.

Films Germanium Silver↗
NASA NTRS1965

Polarizers for the extreme ultraviolet.

Polarization characteristics of materials in XUV AND development of transmitting and reflecting polarizers, using multilayer metal films

ULTRAVIOLET SPECTRUM↗
NASA NTRS1969

Improved vacuum deposition apparatus

Improved apparatus enables vacuum deposition of thick metal films on the inside surface of a cylinder. The evaporant is deposited to a uniform thickness and distribution on the inside surface of the substrate without imperfections that would otherwise result from droplet formation.

Erpenbach, H.↗
NASA NTRS1970

Semiconductor cooling by thin-film thermocouples

Thin-film, metal alloy thermocouple junctions do not rectify, change circuit impedance only slightly, and require very little increase in space. Although they are less efficient cooling devices than semiconductor junctions, they may be applied to assist conventional cooling techniques for electronic devices.

Tick, P. A.↗
NASA NTRS1970

A far ultraviolet photometer for space research

Far UV photometer for space research, isolating specific bands by combining spectral response of individual solar blind photocathodes with thin metallic films transmission qualities

Bowyer, C. S.↗
NASA NTRS1972

Dynamic considerations of dust on the television camera mirror

The mirror on the Surveyor 3 television camera was subjected to tests which modified its surface. Lunar dust was removed by rubbing, by acetate and metallic film stripping techniques, rinsing, scraping, and by inadvertently touching the surface. A second shadow line was revealed. Second and third generation peels were taken across the upper shadow line, and a study was made in order to define the source(s) or events(s) responsible for creating the two shadow lines occurring on the lower part of the mirror.

Nickle, N. L.↗
NASA NTRS1972

Investigation of failure mechanisms in integrated vacuum circuits

The fabrication techniques of integrated vacuum circuits are described in detail. Data obtained from a specially designed test circuit are presented. The data show that the emission observed in reverse biased devices is due to cross-talk between the devices and can be eliminated by electrostatic shielding. The lifetime of the cathodes has been improved by proper activation techniques. None of the cathodes on life test has shown any sign of failure after more than 3500 hours. Life tests of triodes show a decline of anode current by a factor of two to three after a few days. The current recovers when the large positive anode voltage (100 V) has been removed for a few hours. It is suggested that this is due to trapped charges in the sapphire substrate. Evidence of the presence of such charges is given, and a model of the charge distribution is presented consistent with the measurements. Solution of the problem associated with the decay of triode current may require proper treatment of the sapphire surface and/or changes in the deposition technique of the thin metal films.

Rosengreen, A.↗
NASA NTRS1972

Preparation of thin film silver fluoride electrodes from constituent elements

The feasibility of preparing thin-film metal fluoride electrodes from the elemental constituents has been demonstrated. Silver fluoride cathodes were prepared by deposition of silver on a conducting graphite substrate followed by fluorination under controlled conditions using elemental fluorine. The resulting electrodes were of high purity, and the variables such as size, shape, and thickness were easily controlled.

Odonnell, P. M.↗
NASA NTRS1973

Research on ignition and combustion in oxygen systems

The work on ignition and combustion research in oxygen systems under the sponsorship of NASA's Aerospace Safety Research and Data Institute is described. Preliminary results of ignition of nonmetallic materials by electric arc and mechanical impact are presented. Ignition by a resonant process involving repeated shock waves has been demonstrated and some of the results included. In addition, results of studies concerned with ignition due to the rapid rupture of metal films and diaphragms are reviewed. Burning rate studies of three nonmetallic materials in oxygen enriched environments were completed and the results presented. A brief description of these combustion studies under zero gravity is also included. These results are compared to combustion under one gravity.

Ordin, P. M.↗
NASA NTRS1973

Research on ignition and combustion in oxygen systems.

The work on ignition and combustion research in oxygen systems under the sponsorship of NASA's Aerospace Safety Research and Data Institute (ASRDI) is described. Preliminary results of ignition of nonmetallic materials by electric arc and mechanical impact are presented. Ignition by a resonant process involving repeated shock waves has been demonstrated and some of the results included. In addition, results of studies concerned with ignition due to the rapid rupture of metal films and diaphragms are reviewed. Burning rate studies of three nommetallic materials in oxygen enriched environments were completed and the results are presented.

Ordin, P. M.↗
NASA NTRS1974

Laser-actuated mechanical device

Actuator is portable and can be used in high-temperature (over 500 C) environments by incorporating tungsten metal film and quartz window. Actuator can be triggered when it is not directly in laser beam path by utilizing fiber optics. It is advantageous for remotely switching ultra-high voltage systems.

Murphy, A. J.↗