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  • 1
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    Diffraction of elastic waves by three-dimensional surface irregularities (1983)
    In:  Bull. Seism. Soc. Am., Basel, Inst. f. Geophys., Ruhr-Univ. Bochum, vol. 73, no. 2, pp. 1621-1636, pp. 1009, (ISSN: 1340-4202)
    Details
    Publication Date: 1983
    Keywords: Diffraction ; Seismology ; Three dimensional ; Wave propagation ; BSSA ; Sanchez ; SRICHWALSKI
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    BIBLIOGRAPHY SEISMOLOGY
  • 2
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    An objective analysis technique for extrapolating tidal fields (1984)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: An interpolation technique which allows accurate extrapolation of tidal height fields in the ocean basins by making use of selected satellite altimetry measurements and/or conventional gauge measurements was developed and tested. A normal mode solution for the Atlantic and Indian Oceans was obtained by means of a finite difference grid. Normal mode amplitude maps are presented.
    Keywords: OCEANOGRAPHY
    Type: Res. Activities of the Geodyn. Branch; 8 p
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Prediction of force coefficients for labyrinth seals (1984)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: The development of a linear model for the prediction of labyrinth seal forces and on its comparison to available stiffness data is presented. A discussion of the relevance of fluid damping forces and the preliminary stages of a program to obtain data on these forces are examined. Fluid-dynamic forces arising from nonuniform pressure patterns in labyrinth seal glands are known to be potentially destablizing in high power turbomachinery. A well documented case in point is that of the space Shuttle Main Engine turbopumps. Seal forces are also an important factor for the stability of shrouded turbines, acting in that case in conjunction with the effects of blade-tip clearance variations.
    Keywords: MECHANICAL ENGINEERING
    Type: NASA. Lewis Research Center Rotordynamic Instability Problems in High-Performance Turbomachinery; p 235-256
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Lateral density variations in elastic Earth models from an extended minimum energy approach (1980)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Kaula's minimum energy approach was extended to include the nonhydrostatic gravitational potential energy and the density perturbation field was obtained to degree and order eight. The depth profiles for the density perturbation show a stratification with density excesses and deficiencies alternating with depth. The addition of the gravitational potential energy in the minimization process does not change significantly the conclusions based on results for the minimum shear strain energy case, concerning the inability of the mantle to withstand the lateral loading elastically.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-TM-80742
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Role of cobalt in nickel base superalloys (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The effect of cobalt or substituting for cobalt on the mechanical properties of nickel-based superalloys is discussed. Waspaloy, UDIMET 700, and NIMONIC 115, which are representative of Ni-Cr-Co-Al-Ti-Mo superalloys having different gamma prime contents which are strengthened by a heavily alloyed matrix, coherent gamma prime precipitates, and carbides at the grain boundaries. Microstructure and in situ and extracted phase STEM micro-analysis were used to evaluate the three alloys.
    Keywords: METALLIC MATERIALS
    Type: NASA. Lewis Research Center COSAM (Conserv. Of Strategic Aerospace Mater.) Program Overview; p 37-62
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    Astrolabe observations of Mars (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: A previously reported bias in the right ascension residuals of astrolabe observations of Mars is removed by correcting for equinox motion and relating the observations to the Jet Propulsion Laboratory's planetary ephemeris, DE111. The remaining residuals show a 'phase effect', the magnitude of which is solved for and compared with that previously found for meridian transit observations. The final residuals reveal no significant offset in either right ascension or declination. In modifying the residuals, use is also made of Fricke's (1980) correction for the motion of the FK 4 equinox.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Astronomy and Astrophysics; 102; 3, Oc; Oct. 198
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
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    Modeling of gamma/gamma-prime phase equilibrium in the nickel-aluminum system (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: A theoretical model is proposed for the determination of phase equilibrium in alloys, taking into consideration dissimilar lattice parameters. Volume-dependent pair interactions are introduced by means of phenomenological Lennard-Jones potentials and the configurational entropy of the system is treated in the tetrahedron approximation of the cluster variation method. The model is applied to the superalloy-relevant, nickel-rich, gamma/gamma-prime phase region of the Ni-Al phase diagram. The model predicts reasonable values for the lattice parameters and the enthalpy of formation as a function of composition, and the calculated phase diagram closely approximates the experimental diagram.
    Keywords: METALLIC MATERIALS
    Type: Acta Metallurgica (ISSN 0001-6160); 32; 1519-152
    Format: text
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    NASA TECHNICAL REPORTS
  • 8
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    Low-cost production of solar-cell panels (1980)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Large-scale production model combines most modern manufacturing techniques to produce silicon-solar-cell panels of low costs by 1982. Model proposes facility capable of operating around the clock with annual production capacity of 20 W of solar cell panels.
    Keywords: FABRICATION TECHNOLOGY
    Type: NPO-14453 , NASA Tech Briefs (ISSN 0145-319X); 4; 3; P. 429
    Format: text
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    NASA TECHNICAL REPORTS
  • 9
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    Ephemerides and observations of Mars by means of an astrolabe (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: In: Sun and planetary system; Oct 19, 1981 - Oct 23, 1981; Dubrovnik; Yugoslavia
    Format: text
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    NASA TECHNICAL REPORTS
  • 10
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    The use of tethers for payload orbital transfer. Continuation of investigation of electrodynamic stabilization and control of long orbiting tethers, volume 2 (1982)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The SKYHOOK program was used to do simulations of two cases of the use of the tether for payload orbital transfer. The transport of a payload along the tether from a heavy lower platform to an upper launching platform is considered. A numerical example of the Shuttle launching a payload using an orbital tether facility is described.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-CR-162035 , NAS 1.26:162035
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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