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  • COMPOSITE MATERIALS  (2)
  • ATOMIC AND MOLECULAR PHYSICS  (1)
  • 1990-1994
  • 1975-1979  (3)
  • 1965-1969
  • 1925-1929
  • 1979  (3)
  • 1
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    Unknown
    The dispersed fluorescence spectrum of NaAr - Ground and excited state potential curves (1979)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: Potential curves for the ground state and the first excited state of NaAr were determined. The van der Waals molecule NaAr was prepared by supersonic free jet expansion of a mixture of sodium, argon, and helium. The electronic transition from the ground state to the first excited state A2pi was excited by a tunable dye laser and the resulting fluorescence was studied. The dispersed fluorescence spectra show discrete and diffuse features, corresponding to transitions from excited vibrational levels of the A state to bound and unbound levels of the x state. The characteristic reflection structure in the bound-free spectra permits an unambiguous assignment of the vibrational numbering in the A state, and this assignment together with previously measured spectroscopic constants are used to calculate the potential curve of the A state. The discrete structure in the fluorescence spectra is used to determine the potential curve of the x state in the well region, and the repulsive part of the X curve is then deduced through trial-and-error simulation of the bound-free spectra.
    Keywords: ATOMIC AND MOLECULAR PHYSICS
    Type: Journal of Chemical Physics; 71; Aug. 1
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Improved high modulus carbon fibers (1979)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Carbon fibers which are electrically insulating but still maintain the mechanical properties of the original carbon fibers were investigated. Three approaches were taken to increase the electrical resistance of carbon fibers: (1) boron nitride (BN) coatings; (2) doping of carbon fibers to alter their electrical properties; and (3) low temperature final heat treatment. The structure of carbon fibers and its effect upon properties was also studied. Results are presented.
    Keywords: COMPOSITE MATERIALS
    Type: NASA-CR-158479
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Effects of isothermal and cyclic exposures on interface structure and mechanical properties of FPalpha-Al2O3/aluminum composites (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-07-27
    Description: The microstructural and interface stability of FPalpha-Al203/Al-Li composites are investigated as a function of isothermal exposure at 500 C or thermal cycling between 140 and 500 C with hold time at Tmax. Interfacial morphology, growth kinetics, crystal structure, and composition of interfacial reaction products are characterized. Strength is monitored in the transverse orientation, and fracture mechanics is analyzed in terms of interface reaction products. The interfacial reaction product in FP/Al is Li2O.5Al2O3. Significant fiber-matrix reaction occurs during fabrication. The number of thermal cycles rather than total time at Tmax is the determining factor in strength degradation, thermal cycling giving rise to voids at the fiber-matrix interface. Extensive interface failures occur at composite fracture stresses below about 128 MPa; above this stress level failure is attributed to ductile matrix fracture.
    Keywords: COMPOSITE MATERIALS
    Type: New developments and applications in composites; 17, 1978; Louis, MO.
    Format: text
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