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  • Other Sources  (17)
  • 2020-2022
  • 1975-1979  (5)
  • 1970-1974  (12)
  • 1
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    Vibrational spectrum of CO2/-/ in an argon matrix (1974)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Ar:CO:N2O samples of mole ratio 250:1:1 and 500:1:1 were codeposited at 14 K with an atomic beam of sodium or potassium. The infrared spectrum of the resulting deposit was basically identical to that for CO and N2O isolated in an argon matrix in the absence of alkali metal atoms. Spectral absorption features were studied of Ar:CO2 samples of mole ratio ranging from 250 to 500 codeposited with an atomic beam of potassium. Ar:CO2 samples with a mole ratio in the range from 250 to 1000, which had been codeposited with an atomic beam of cesium, were also investigated.
    Keywords: ATOMIC AND MOLECULAR PHYSICS
    Type: Chemical Physics Letters; 28; Sept. 15
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Digital data command bus (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Command bus constructed from coaxial cable has short segments of its outer jacket and shield removed and replaced with small ferrite cores carrying multiturn windings connected to decoder. Device reduces number of wire pairs required to communicate command data to systems and subsystems.
    Keywords: ELECTRONIC COMPONENTS AND CIRCUITS
    Type: NPO-11637
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Viscoseal performance with rarefied-gas sealant (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A fundamental study of viscoseals having a rarefied gas as the sealant was conducted. Both experimental and analytical investigations are reported. Three different analytical models were formulated and are described in detail. An experimental investigation was conducted on multiple grooved two-inch diameter viscoseals over a wide range of gas densities and shaft speeds up to 30,000 rpm. Comparisons are presented between actual viscoseal performance and the theoretical predictions for both sealing coefficient and net leakage parameters as functions of the degree of gas rarefication. Recommendations are presented for the use of the analytical models.
    Keywords: MACHINE ELEMENTS AND PROCESSES
    Type: NASA-CR-121089 , AE-71-023-9
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Performance of continuum gas viscoseals. (1971)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Viscoseals performance as predicted by three different analytical models is compared with experimental data for air as the continuum gas sealant. An experimental investigation has been conducted on two multiple-grooved two-inch diameter viscoseals up to shaft speeds of 35,000 rpm. The two seal geometries considered differ significantly insofar as groove aspect ratio is concerned. The results of this continuum investigation of sealing coefficient for the gas viscoseals suggest that the Boon and Tal model is a good design tool for the laminar continuum regime provided it is restricted to high aspect ratio groove applications.
    Keywords: MACHINE ELEMENTS AND PROCESSES
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Viscoseal performance with rarefied-gas sealant (1971)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A fundamental study of viscoseals having a rarefied gas as the sealant has been conducted. Both experimental and analytical investigations are reported. Three different analytical models have been formulated and are described in detail. An experimental investigation has been conducted on multiple grooved two-inch diameter viscoseals over a wide range of gas densities and shaft speeds up to 30,000 rpm. Comparisons are presented between actual viscoseal performance and the theoretical predictions for both sealing coefficient and net leakage parameters as functions of the degree of gas rarefication. Recommendations are presented for the use of the analytical models.
    Keywords: MACHINE ELEMENTS AND PROCESSES
    Type: NASA-CR-120911 , AE-71-023-9
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    Foam composite structures (1976)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The need to include fire resistant foams into state of the art aircraft interior paneling to increase passenger safety in aircraft fires was studied. Present efforts were directed toward mechanical and fire testing of panels with foam inclusions. Skinned foam filled honeycomb and PBI structural foams were the two constructions investigated with attention being directed toward weight/performance/cost trade-off. All of the new panels demonstrated improved performance in fire and some were lighter weight but not as strong as the presently used paneling. Continued efforts should result in improved paneling for passenger safety. In particular the simple partial filling (fire side) of state-of-the-art honeycomb with fire resistant foams with little sacrifice in weight would result in panels with increased fire resistance. More important may be the retarded rate of toxic gas evolution in the fire due to the protection of the honeycomb by the foam.
    Keywords: COMPOSITE MATERIALS
    Type: NASA-CR-137834 , AEROTHERM-76-193
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 7
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    Viscoseal performance for rarefied gas sealant. (1971)
    In:  Other Sources
    Details
    Publication Date: 2019-07-27
    Description: Viscoseal performance as predicted by three different analytical models is compared with experimental data for a rarefied gas sealant. An experimental investigation has been conducted on two multiple grooved two-inch diameter viscoseals over a wide range of gas densities and shaft speeds up to 30,000 rpm. The two seal geometries considered differ significantly insofar as groove aspect ratio is concerned. Two types of seal performances are presented in the form of net leakage operation and sealing coefficient performance as functions of the degree of gas rarefication. Although the analytical models correctly predict sealing trends, all of the models are shown to have some deficiencies which prevent their indiscriminate application.
    Keywords: MACHINE ELEMENTS AND PROCESSES
    Format: text
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    NASA TECHNICAL REPORTS
  • 8
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    Techniques for improving reliability of computers (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Modular design techniques improve methods of error detection, diagnosis, and recovery. Theoretical computer (MARCS (Modular Architecture for Reliable Computer Systems)) study deals with postulated and modeled technology indigenous to 1975-1980. Study developments are discussed.
    Keywords: ELECTRONIC SYSTEMS
    Type: MFS-21326
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 9
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    Theoretical performance of rarefied-gas viscoseals (1970)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Rarefied gas viscoseals performance prediction by theoretical model, comparing results with experiment
    Keywords: MACHINE ELEMENTS AND PROCESSES
    Type: ASLE PREPRINT 70AM 5C-3 , AMERICAN SOCIETY OF LUBRICATION ENGINEERS, ANNUAL MEETING, 25TH; May 04, 1970 - May 08, 1970; CHICAGO, IL
    Format: text
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    NASA TECHNICAL REPORTS
  • 10
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    Preliminary results from the S-056 X-ray telescope experiment aboard the Skylab-Apollo Telescope Mount (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Keywords: SOLAR PHYSICS
    Type: AIAA PAPER 74-1233 , Conference on Scientific investigations on the Skylab satellite; Oct 30, 1974 - Nov 01, 1974; Huntsville, AL
    Format: text
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    NASA TECHNICAL REPORTS
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