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  • EARTH RESOURCES AND REMOTE SENSING  (3)
  • INSTRUMENTATION AND PHOTOGRAPHY  (3)
  • 2020-2023
  • 1980-1984  (6)
  • 1935-1939
  • 1
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    A portable x-ray analyzer for wearmetal particles in lubricants (1983)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: An extensive program exists for the systematic sampling and analysis of lubricants in U.S. Air Force aircraft engines. The sudden development of excessive engine wear can usually be detected on the basis of monitoring the concentration of several key metallic elements for each aircraft engine. In many cases even the specific fault within an engine can be recognized. The two types of equipment which are currently being employed for the conduction of oil analyses make use of atomic emission or atomic absorption spectroscopy. In both cases, heavy, large, and relatively fragile pieces of equipment are involved. Difficulties concerning the transportation of these devices have led to the development of a small, sturdy, and easily portable wearmetal analyzer. The analyzer makes use of an X-ray fluorescence technique.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Inflatable device for installing strain gage bridges (1983)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Methods and devices for installing in a tubular shaft multiple strain gages are disclosed with focus on a method and a device for pneumatically forcing strain gages into seated engagement with the internal surfaces of a tubular shaft in an installation of multiple strain gages in a tubular shaft. The strain gages or other electron devices are seated in a template-like component which is wrapped about a pneumatically expansible body. The component is inserted into a shaft and the body is pneumatically expanded after a suitable adhesive was applied to the surfaces.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Remote sensing of thermal radiation from an aircraft - An analysis and evaluation of crop-freeze protection methods (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Thermal images from an aircraft-mounted scanner are used to evaluate the effectiveness of crop-freeze protection devices. Data from flights made while using fuel oil heaters, a wind machine and an undercanopy irrigation system are compared. Results show that the overall protection provided by irrigation (at approximately 2 C) is comparable to the less energy-efficient heater-wind machine combination. Protection provided by the wind machine alone (at approximately 1 C) was found to decrease linearly with distance from the machine by approximately 1 C/100 m. The flights were made over a 1.5 hectare citrus grove at an altitude of 450 m with an 8-14 micron detector. General meteorological conditions during the experiments, conducted during the nighttime, were cold (at approximately -6 C) and calm with clear skies.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: Journal of Applied Meteorology; 20; July 198
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    An analysis of LANDSAT MSS scene-to-scene registration accuracy (1981)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Measurements were made for 12 registrations done by ERL for 8 registrations done by SRS. The results indicate that the ERL method is significantly more accurate in five of the eight comparison. The difference between the two methods are not significant in the other three cases. There are two possible reasons for the differences. First, the ERL model is a piecewise linear model and the EDITOR model is a cubic polynomial model. Second, the ERL program resamples using bilinear interpolation while the EDITOR software uses a nearest neighbor resampling. This study did not indicate how much of the difference is attributable to each factor. The average of all merged scene error values for ERL was 31.6 meters and the average for the eight common areas was 32.6 meters. The average of the eight merged scene error values for SRS was 40.1 meters.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: E82-10285 , NASA-TM-84694 , DC-Y1-04156 , NSTL/ERL-198 , NAS 1.15:84694
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    AgRISTARS: Interim catalog ground data summary, data acquisition year 1979 (1981)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: To honor numerous requests for information about data holdings, and to facilitate the requirements specifications process, a series of interim catalogs are being developed. The 1979 data acquisition year is covered in this volume with subsequent years to follow under different covers. This catalog lists by state those sample segment numbers for which aircraft data has been acquired and/or field inventory products produced.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: E82-10032 , NASA-CR-161033 , MU-L1-04055 , LEMSCO-16207 , JSC-17119
    Format: application/pdf
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  • 6
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    Gamma-ray imaging with a rotating hexagonal uniformly redundant array (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Laboratory experiments have been performed to demonstrate the capabilities of a gamma-ray imaging system employing a NaI Anger camera and a rotating coded aperture mask. The mask incorporates in its design a new type of hexagonal uniformly redundant array (HURA) which is essentially antisymmetric under 60 deg rotation. The image formation techniques are described and results are presented that demonstrate the imaging capability of the system for individual and multiple point sources of gamma-ray emission. The results are compared to analytical predictions for the imaging and point source localization capabilities of coded aperture systems using continuous detectors.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: IEEE Transactions on Nuclear Science (ISSN 0018-9499); NS-31; 771-775
    Format: text
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    NASA TECHNICAL REPORTS
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