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  • Other Sources  (191)
  • PROPULSION SYSTEMS  (135)
  • ASTRONOMY
  • EARTH RESOURCES AND REMOTE SENSING
  • 1970-1974  (191)
Collection
  • Other Sources  (191)
Source
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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    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
  • 3
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    Solar electric propulsion system technology (1970)
    In:  Other Sources
    Details
    Publication Date: 2019-07-27
    Description: Solar electric propulsion systems technology development at JPL, discussing performance data and relationship to spacecraft requirements
    Keywords: PROPULSION SYSTEMS
    Type: AIAA PAPER 70-1153
    Format: text
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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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    Hypersonic ramjet experiment project. Phase 1: Computer program description, ramjet and scramjet cycle performance (1974)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A computer program was developed to describe the performance of ramjet and scramjet cycles. The program performs one dimensional calculations of the equilibrium, real-gas internal flow properties of the engine. The program can be used for the following: (1) preliminary design calculation and (2) design analysis of internal flow properties corresponding to stipulated flow areas. Only the combustion of hydrogen in air is considered in this case.
    Keywords: PROPULSION SYSTEMS
    Type: NASA-CR-132454 , AP-1001-1
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    Solar electric propulsion system technology (1971)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Achievements in the solar electric propulsion system technology program (SEPST 3) are reported and certain propulsion system-spacecraft interaction problems are discussed. The basic solar electric propulsion system concept and elements are reviewed. Hardware is discussed only briefly, relying on detailed fabrication or assembly descriptions reported elsewhere. Emphasis is placed on recent performance data, which are presented to show the relationship between spacecraft requirements and present technology.
    Keywords: PROPULSION SYSTEMS
    Type: NASA-CR-124572 , JPL-TM-33-510
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 7
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    Fluid mechanics approach to acoustic liner design (1970)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Fluid mechanics approach to acoustic liner design
    Keywords: PROPULSION SYSTEMS
    Type: NASA-CR-72807 , AMS-963
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 8
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    Design and development of a Micropound Extended Range Thrust Stand /MERTS/ (1971)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Micropound extended range thrust test stand design and cesium engine calibrating standards
    Keywords: PROPULSION SYSTEMS
    Type: NASA-TN-D-7029 , G-1010
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 9
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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
  • 10
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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
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