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  • Other Sources  (11)
  • 1995-1999
  • 1975-1979  (11)
  • 1950-1954
  • 1977  (11)
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  • 1995-1999
  • 1975-1979  (11)
  • 1950-1954
Year
  • 1
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    Inversion of infrared limb emission measurements for temperature and trace gas concentrations (1977)
    In:  CASI
    Details
    Publication Date: 2006-05-22
    Description: Limb emission measurements are characterized by sharp weighting functions at high altitudes, and for temperature determinations, strongly nonlinear dependence of the weighting function on the temperature. Several methods for inverting this type of measurement have been described and used, including iterative, statistical, nonlinear and approximate direct approaches. These approaches are described and advantages and disadvantages of each are outlined.
    Keywords: GEOPHYSICS
    Type: NASA. Langley Res. Center Inversion Methods in Atmospheric Remote Sounding; p 195-216
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Radiological protection and medical dosimetry for the Skylab crewmen (1977)
    In:  CASI
    Details
    Publication Date: 2006-01-16
    Description: Dosimetry results for Skylab crewmembers show that the Skylab 4 crewmen received the highest dose equivalents but remained well within the established limits for Skylab missions below the threshold of significant clinical effects. These dose equivalents apply specificially to long term effects such as general life shortening, increased neoplasm incidence, and cataract production. A Skylab crewman could fly a mission comparable to one 84-day Skylab 4 mission per year for 50 years before exceeding these career limits.
    Keywords: AEROSPACE MEDICINE
    Type: Biomed. Results from Skylab; p 64-69
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Visual light flash observations on Skylab 4 (1977)
    In:  CASI
    Details
    Publication Date: 2013-08-29
    Description: Evaluation of light flashes observed in earth orbit establishes: (1) a strong correlation of very high flash rates with passage through the South Atlantic anomaly; (2) evidence for a predicted latitude effect; and (3) an increased flash rate outside the anomaly during a second observation period. Event rates and flash descriptions during South Atlantic anomaly passes indicate that there may be particles heavier than protons in the inner belt of trapped radiation.
    Keywords: AEROSPACE MEDICINE
    Type: Biomed. Results from Skylab; p 127-130
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    An analysis technique for microstrip antennas (1977)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: The paper presents a combined numerical and empirical approach to the analysis of microstrip antennas over a wide range of frequencies. The method involves representing the antenna by a fine wire grid immersed in a dielectric medium and then using Richmond's reaction formulation (1974) to evaluate the piecewise sinusoidal currents on the grid segments. The calculated results are then modified to account for the finite dielectric discontinuity. The method is applied to round and square microstrip antennas.
    Keywords: COMMUNICATIONS AND RADAR
    Type: IEEE Transactions on Antennas and Propagation; AP-25; Nov. 197
    Format: text
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  • 5
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    Photometry of slow X-ray pulsars. II - The 13.9 minute period of X Persei (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Results are presented for time-resolved narrow-band photometry and spectrophotometry of X Per performed in an unsuccessful effort to confirm previously reported observations of 13.9-min pulsations in the intensity of the He II line at 4686 A. No features that are synchronous with a 13.9-min period are found in the optical data, and simultaneous X-ray observations of 3U 0352+30 are reported which show that a strong 13.9-min X-ray modulation was present during the optical photometry. Some implications of the X-ray periodicities observed for X Per are considered.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal; vol. 218
    Format: text
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  • 6
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    Development of the propulsion simulator - A test tool applicable to V/STOL configurations (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A turbine engine multi-mission propulsion simulator, capable of representing inlet/airframe/nozzle flowfield interactions for supersonic V/STOL aircraft wind tunnel models, is described. The propulsion simulator replaces conventional aero flow-through and jet effects models with a single model; flow field interactions modeled by the simulator may include close-coupled inlets and nozzles, non-axisymmetric vectoring exhaust nozzles, and forward canards mounted near the inlets and wings. Wind tunnel tests of the simulation system at Mach numbers up to 1.2 are reported for a model typical of a F-15 aircraft installation. The possibility of applying the simulator to advanced V/STOL design programs is also discussed.
    Keywords: RESEARCH AND SUPPORT FACILITIES (AIR)
    Type: SAE PAPER 770984 , Aerospace Meeting; Nov 14, 1977 - Nov 17, 1977; Los Angeles, CA
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  • 7
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    Manufacture and engine test of advanced oxide dispersion strengthened alloy turbine vanes (1977)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Oxide-Dispersion-strengthened (ODS) Ni-Cr-Al alloy systems were exploited for turbine engine vanes which would be used for the space shuttle thermal protection system. Available commercial and developmental advanced ODS alloys were evaluated, and three were selected based on established vane property goals and manufacturing criteria. The selected alloys were evaluated in an engine test. Candidate alloys were screened by strength, thermal fatigue resistance, oxidation and sulfidation resistance. The Ni-16Cr (3 to 5)Al-ThO2 system was identified as having attractive high temperature oxidation resistance. Subsequent work also indicated exceptional sulfidation resistance for these alloys.
    Keywords: METALLIC MATERIALS
    Type: NASA-CR-135269 , R77AEG569
    Format: application/pdf
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  • 8
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    Thick-film preamplifier (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Preamplifier with hybrid discrete components and integrated-circuit packaging is designed specifically for use as television image-tube output signal conditioner. Circuit is fabricated on alumina substrate, measuring 0.5 by 0.5 by 0.015 inch using gold-base conductor with conductive gold crossovers and dielectric insulation.
    Keywords: ELECTRONIC COMPONENTS AND CIRCUITS
    Type: NPO-13416 , NASA Tech Briefs (ISSN 0145-319X); 1; 4; P. 509
    Format: text
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    NASA TECHNICAL REPORTS
  • 9
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    Spectral absorption coefficients for the fundamental and first overtone vibration-rotation bands of CN (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: A previous measurement of the transition moment of the fundamental vibration-rotation band of CN is combined with theoretical calculations of relative vibrational transition probabilities in order to compute absorption coefficients for the CN fundamental and first-overtone bands. Line strengths for 121 lines in each branch of all fundamental and first-overtone bands with upper-transition states not greater than 6 are calculated for temperatures of 2000, 3000, and 4000 K; these line strengths are presented as averaged over 8-kayser intervals. The relative vibrational transition moments are placed on an absolute scale, and the wavenumbers of the band origins and heads are given
    Keywords: ATOMIC AND MOLECULAR PHYSICS
    Type: Astrophysical Journal; 211; Jan. 15
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  • 10
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    Statistical evaluation of control inputs and eye movements in the use of instruments clusters during aircraft landing (1977)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Two different types of analyses were done on data from a study in which eye movements and other variables were recorded while four pilots executed landing sequences in a Boeing 737 simulation. Various conditions were manupulated, including changes in turbulence, starting position, and instrumentation. Control inputs were analyzed in the context of the various conditions and compared against ratings of workload obtained using the Cooper-Harper scale. A number of eye-scanning measures including mean dwell time and transition from one instrument to another were entered into a principal components factor analysis. The results show a differentiation between control inputs and eye-scanning behavior. This shows the need for improved definition of workload and experiments to uncover the important differences among control inputs, eye-scanning and cognitive processes of the pilot.
    Keywords: MAN/SYSTEM TECHNOLOGY AND LIFE SUPPORT
    Type: NASA-CR-149465 , TR-4-76
    Format: application/pdf
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