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  • Other Sources  (151)
  • MATERIALS, NONMETALLIC  (95)
  • ASTRONOMY
  • EARTH RESOURCES AND REMOTE SENSING
  • 1970-1974  (151)
Collection
  • Other Sources  (151)
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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    Template catalysis - Asymmetric polymerization of amino-acids on clay minerals (1970)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Amino acids asymmetric polymerization on clay minerals, discussing aspartic acid and kaolinite experiments
    Keywords: MATERIALS, NONMETALLIC
    Type: ; SEARCH(
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Material and structural studies of metal and polymer matrix composites (1973)
    In:  CASI
    Details
    Publication Date: 2012-05-23
    Description: Fiber-reinforced composites and design analysis methods for these materials are being developed because of the vast potential of composites for decreasing weight and/or increasing use temperature capability in aerospace systems. These composites have potential for use in airbreathing engine components as well as aeronautical and space vehicle structures. Refractory wire-superalloy composites for use up to 2200 F or more and metal-matrix composites for lower temperature applications such as aerospace structures and turbojet fan and compressor blades are under investigation and are discussed. The development of a number of resin systems, including the polyimides and polyphenylquinoxalines, is described and their potential for use at temperatures approaching 315 C (600 F) is indicated. Various molecular modifications that improve processability and/or increase thermal and oxidative resistance of the resins are also described. Structural analysis methods are discussed for determining the stresses and deformations in complex composite systems. Consideration is also given to residual stresses resulting from the curing process and to the foreign object damage problem in fan blade applications.
    Keywords: MATERIALS, NONMETALLIC
    Type: AGARD Impact of Composite Mater. on Aerospace Vehicles and Propulsion Systems; 16 p
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Addition-type polyimides from solutions of monomeric reactants (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The monomeric reactants approach was used to fabricate addition-type polyimide/graphite fiber composites with improved mechanical properties and thermal stability characteristics over those of composites derived from addition-type amide acid prepolymers. A screening study of 24 different monomer combinations was performed. The results of a more extensive investigation of a selected number of monomer combinations showed that the combination providing the best thermomechanical properties was 5-norbornene-2,3-dicarboxylic acid monomethyl ester/4,4'-methylenedianiline/3,3'4,4'-benzophenone tetracarboxylic acid dimethyl ester at a molar ratio of 2/3.09/2.09.
    Keywords: MATERIALS, NONMETALLIC
    Type: NASA-TN-D-6877 , E-6750
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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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
  • 6
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    Criteria for selecting resin matrices for improved composite strength (1973)
    In:  CASI
    Details
    Publication Date: 2019-07-27
    Description: Criteria are presented which can be used a priori to select matrices to yield composites with improved unidirectional strength. The criteria evolved from an investigation including both theoretical and experimental efforts. Composite micromechanics were used in conjunction with suitable experiments and reference data to identify those matrix properties which influence composite strength properties. Composites of graphite fibers and low, intermediate and high-modulus resins were investigated. It was found that the area under the matrix stress/strain diagram limited to one percent strain is a good index for an a priori assessment of the matrix contribution to composite strength. The corresponding initial modulus is a useful parameter in translating matrix properties to composite properties. Matrix properties such as ultimate strength, ultimate elongation, toughness, and fracture toughness are misleading in translating matrix properties to composite strength.
    Keywords: MATERIALS, NONMETALLIC
    Type: NASA-TM-X-68166 , E-7226 , Reinforced Plastics/Composites Inst.; 6-9 Feb.; Washington; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 7
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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
  • 8
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    Thermally stable polyimides from solutions of monomeric reactants (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A method for preparing thermally stable resin-fiber-reinforced composites by using solutions of appropriate monomers is described. Solutions containing a dimethyl ester of an aryl tetracarboxylic acid, the monomethyl ester of nadic acid, and an aryl diamine were used to impregnate graphite fibers. Composites fabricated from these prepregs exhibited excellent thermo-oxidative stability and retention of mechanical properties at 315 C (600 F). These results compare favorably to those obtained from composites made from amide-acid prepolymers capped with reactive alicyclic rings. Monomeric solutions provide excellent shelf life and improved solubility compared to amide-acid prepolymer solutions.
    Keywords: MATERIALS, NONMETALLIC
    Type: NASA-TN-D-6611 , E-6255
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 9
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    Effects of thermal and environmental exposure on the mechanical properties of graphite/polyimide composites (1971)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Composites were exposed in circulating and static air environments up to 589 K for a maximum of 1000 hours. Composites of HT-S, HM-S, Thornel 50S, and Fortafil 5-Y fiber and a new addition type polyimide resin were laminated in a matched-die mold. Flexural strengths, flexural modulus, and interlaminar shear strengths were determined at 297, 533, and 598 K after various durations of exposure. Composite and fiber weight loss characteristics were determined by isothermal gravimetric analysis in air. Properties of composites exposed and tested at the environment temperatures were compared with those determined under short-term exposure. A new short beam interlaminar shear fixture is described. Environmental effects of long-term ambient temperature exposure on the elevated temperature mechanical properties of graphite/polyimide composites are presented.
    Keywords: MATERIALS, NONMETALLIC
    Type: NASA-TN-D-6604 , E-6497
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 10
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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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