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  • Other Sources  (171)
  • AERODYNAMICS  (115)
  • ASTRONOMY
  • EARTH RESOURCES AND REMOTE SENSING
  • 1970-1974  (171)
Collection
  • Other Sources  (171)
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Keywords
Years
Year
  • 1
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    Microwave maps of the polar ice of the earth (1974)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Synoptic views of the entire polar regions of earth have been obtained free of the usual persistent cloud cover using a scanning microwave radiometer operating at a wavelength of 1.55 cm on board the Nimbus-5 satellite. Three different views at each pole are presented utilizing data obtained at approximately one-month intervals from December 1972 to February 1973. Large discrepancies exist between the long-term ice cover depicted in various atlases and the actual extent of the canopies. The distribution of multiyear ice in the north polar region is markedly different from that predicted by existing ice dynamics models. Irregularities in the edge of the Antarctic sea ice pack occur that have neither been observed previously nor anticipated. The brightness temperatures of the Greenland and Antarctic glaciers show interesting contours probably related to the ice and snow morphologic structure.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: American Meteorological Society; vol. 55
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Evolution of the F-8 supercritical wing configuration (1972)
    In:  CASI
    Details
    Publication Date: 2004-12-03
    Keywords: AERODYNAMICS
    Type: Supercritical Wing Technol.: A Report on Flight Evaluation; p 35-48
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    The effects of soil moisture and plant morphology on the radar backscatter from vegetation (1974)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The results of experimental studies on the backscattering properties of corn, milo, soybeans and alfalfa are presented. The measurements were made during the summer of 1973 over the 8 to 18 GHz frequency band. The data indicate that soil moisture estimation is best accomplished at incidence angles near nadir with lower frequencies, while crop discrimination is best accomplished using two frequencies at incidence angles ranging from 30 deg to 65 deg. It is also shown that temporal plant morphology variations can cause extreme variations in the values of the scattering coefficients. These morphological changes can be caused by growth, heavy rain and in the case of alfalfa, harvesting.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: NASA-CR-141684 , RSL-TR-177-51
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Research and investigation of geology, mineral, and water resources of Maryland (1974)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The authors have identified the following significant results. Field work in Baltimore County revealed that the signature returns of serpentinitic and nonserpentinitic rocks correlates with the vegetation cover and land use pattern. In Maryland Piedmont, bedrock lithology and structure are enhanced only to the extent that land use is geologically dictated. Two prominent sets of linear features are detected on ERTS-1 imagery at N 45 deg E and N 20 deg E. Beaches of Chesapeake Bay are classified as broad and narrow beaches based on the width of the backshore zone. It is shown by comparing historical shorelines of Ocean City, from the inlet to the Maryland-Delaware line that reversal zones of erosion and accretion occur at different locations for different periods. High reflectance levels (high marsh-high topographic areas) for the lower Eastern Shore are found to be distributed as two distinct trending linear ridge systems. Observations of MSS band 5 dated 9 April 1974 exhibited an unique sedimentation pattern for Chesapeake Bay. Following a 1.5 inch rainfall, heavy concentration of suspended sediments is observed on the imagery, particularly in the area of the turbidity maximum.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: E75-10314 , NASA-CR-142916
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Full-scale wind-tunnel tests of a small unpowered jet aircraft with a T-tail (1971)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The aerodynamic characteristics of a full scale executive type jet transport aircraft with a T-tail were investigated in a 40 x 80 ft (12.2 by 24.4 meter) wind tunnel (subsonic). Static, longitudinal, and lateral stability, and control characteristics were determined at angles of attack from -2 deg to +42 deg. The aircraft wing had 13 deg of sweep and an aspect ratio of 5.02. The aircraft was tested power off with various wing leading- and trailing-edge high lift devices. The basic configuration was tested with and without such components as engine nacelles, wing tip tanks, and empannage. Hinge-moment data were obtained and downwash angles in the horizontal-tail plane location were calculated. The data were obtained at Reynolds numbers of 4.1 million and 8.7 million based on mean aerodynamic chord. The model had static longitudinal stability through initial stall. Severe tail buffet occurred near the angle of attack for maximum lift. Above initial stall the aircraft had pronounced pitch-up, characteristic of T-tail configurations. A stable trim point was possible at angles of attack between 30 deg and 40 deg (depending on c.g. location and flap setting). Hinge-moment data showed no regions with adverse effects on stick force. Comparisons of wind-tunnel data and flight-test are presented.
    Keywords: AERODYNAMICS
    Type: NASA-TN-D-6573 , A-3135
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    Application of ERTS-1 data to the protection and management of New Jersey's coastal environment (1974)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The author has identified the following significant results. Quasi-operational information products for coastal zone management have been prepared using ERTS-1 imagery and collateral aerial photography. These products were applied to the practical regulation, protection, and management of New Jersey's coastal environment. Procedures were developed for the operational use of ERTS-1 data products within New Jersey's Department of Environmental Protection. Successful analysis and product preparation for operational needs centered on four major coastal resource problem areas: (1) detection of environmental changes in coastal areas, (2) siting of ocean outfalls, (3) monitoring of offshore waste disposal, and (4) calculation of recession rates along the Atlantic Shore. The utility and monetary benefits derived from ERTS and aircraft imagery for each problem area have been determined. The NJDEP estimates the possibility of $620,000 yearly savings through the use of an operational ERTS system and a one-time savings of $2.8 million on current or planned projects if a truly operational ERTS type satellite were available.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: E75-10190 , NASA-CR-142339
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 7
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    Skylab S-193 altimeter experiment performance, results and applications (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A description of the Skylab altimeter instrument system along with the appropriate system error model is presented. The data processing flow, orbit computation, and topographic recovery techniques are discussed. Some data analysis results are presented which indicate excellent correlation with underwater topographic features. In addition, results are shown which indicate that the instrument performance was as expected.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: International Symposium on Applications of Marine Geodesy; Jun 03, 1974 - Jun 05, 1974; Columbus, OH
    Format: text
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    NASA TECHNICAL REPORTS
  • 8
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    Microwave signatures of snow, ice and soil at several wavelengths (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Analyses of data obtained from aircraft-borne radiometers have shown that the microwave signatures of various parts of the terrain depend on both the volume scattering cross-section and the dielectric loss in the medium. In soil, it has been found that experimental data fit a model in which the scattering cross section is negligible compared to the dielectric loss. On the other hand, the volume scattering cross-section in snow and continental ice was found, from analyzing data obtained with aircraft- and spacecraft-borne radiometers, to be more important than the dielectric loss or surface reflectivity in determining the observed microwave emissivity. A model which assumes Mie scattering of ice particles of various sizes was found to be the dominant volume scattering mechanism in these media. Both spectral variation in the microwave signatures of snow and ice fields, as well as the variation in the emissivity of continental ice sheets such as those covering Greenland and Antarctica appear to be consistent with this model.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: Specialist Meeting on Microwave Scattering and Emission from the Earth; Sep 23, 1974 - Sep 26, 1974; Berne; Switzerland
    Format: text
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    NASA TECHNICAL REPORTS
  • 9
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    Nonlinearities in analyses of unsteady flow around oscillating wings (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: An analysis of nonlinearities involved in unsteady subsonic viscous flow around wings at high Reynolds numbers is presented. The finite element method was applied for the numerical integration of the vorticity transport equations. Physical and numerical aspects of the nonlinearities are discussed. Magnification of nonlinearities in the convection terms near wing surfaces due to changing geometry at leading and trailing edges of the wing chord is determined. As a bubble is generated near the leading edge, the timewise variation of vorticity and pressure distributions over the surface is shown. The different procedures for the integration of the vorticity transport equations in three dimensions along spanwise, chordwise, and normal directions are discussed.
    Keywords: AERODYNAMICS
    Type: Computational methods in nonlinear mechanics; International Conference; Sep 23, 1974 - Sep 25, 1974; Austin, TX
    Format: text
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    NASA TECHNICAL REPORTS
  • 10
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    Inverse problem approach to the design of short two-dimensional diffusers. (1972)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Keywords: AERODYNAMICS
    Type: ASME PAPER 72-WA/GT-6 , Winter Annual Meeting of the American Society of Mechanical Engineers; Nov 26, 1972 - Nov 30, 1972; New York, NY
    Format: text
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