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  • Other Sources  (7)
  • ELECTRONICS AND ELECTRICAL ENGINEERING  (2)
  • NONMETALLIC MATERIALS  (2)
  • STRUCTURAL MECHANICS  (2)
  • Anisotropy  (1)
  • 1
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    Seismic anisotropy in the shallow crust of the Loma Prieta segment of the San Andreas fault system (1994)
    In:  J. Geophys. Res., Kunming, China, 3-4, vol. 99, no. 2, pp. 9651-9661, pp. B05301, (ISSN: 1340-4202)
    Details
    Publication Date: 1994
    Keywords: Seismics (controlled source seismology) ; Anisotropy ; Fault zone ; JGR
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    BIBLIOGRAPHY SEISMOLOGY
  • 2
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    Propagation of crazing in viscoelastic media (1983)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: In response to a tensile stress glassy polymers exhibit crazing (surface cracks) which is a phenomenon of considerable practical and theoretical importance in the use of many plastics. An attempt is made to demonstrate how craze growth behavior is affected by the craze density (which is defined as the total number of crazes per unit surface area) surrounding the craze.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-CR-173244 , NAS 1.26:173244
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Energy absorption by polymer crazing (1983)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: During the past thirty years, a tremendous amount of research was done on the development of crazing in polymers. The phenomenon of crazing was recognized as an unusual deformation behavior associated with a process of molecular orientation in a solid to resist failure. The craze absorbs a fairly large amount of energy during the crazing process. When a craze does occur the surrounding bulk material is usually stretched to several hundred percent of its original dimension and creates a new phase. The total energy absorbed by a craze during the crazing process in creep was calculated analytically with the help of some experimental measurements. A comparison of the energy absorption by the new phase and that by the original bulk uncrazed medium is made.
    Keywords: NONMETALLIC MATERIALS
    Type: NASA-CR-173275 , NAS 1.26:173275
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    On the three-dimensional vibrations of the cantilevered rectangular parallelepiped (1983)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: A solution is presented for the three-dimensional problem of determining the free vibration frequencies and mode shapes for a rectangular parallelepiped which is completely fixed on one face and free on the other five faces. This problem apparently is previously unsolved in the published literature. The Ritz method is used, with displacements assumed in the form of algebraic polynomials. Convergence is studied. Numerical results are given for the first five frequencies of each of the four symmetry classes of vibration, for five thick parallelepiped configurations, including the cube. Contour plots are exhibited for the modal displacements of the cube. The effects of varying Poisson's ratio are also observed.
    Keywords: STRUCTURAL MECHANICS
    Type: Acoustical Society of America, Journal (ISSN 0001-4966); 73; June 198
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Propagation of crazing in viscoelastic media (1983)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The way in which the craze growth behavior is affected by the craze density surrounding the craze is investigated. The craze density is defined as the total number of crazes per unit surface area. It is noted that heretofore the growth rate of a craze has been considered either constant or inversely proportional to time. By allowing for the effect of the surrounding population of crazes, it is found that the craze growth rate is influenced by the local effective stress acting in the vicinity of the craze. It is found that measured data of craze length as a function of time are greatly affected by local interactions. With regard to the craze number, it is found that at high stresses a large number of small crazes becomes visible after a relatively short time, whereas under small stresses a large number of large crazes becomes visible after a long loading time.
    Keywords: NONMETALLIC MATERIALS
    Type: Journal of Applied Physics (ISSN 0021-8979); 54; Oct. 198
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    Multibit sigma-delta modulator with reduced sensitivity to DAC nonlinearity (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: A new architecture is presented for a multibit oversampled Sigma-Delta A/D convertor. A novel feedback arrangement is employed to reduce the sensitivity of the overall resolution to the nonlinearity of the multibit DAC. Simulations confirm the improved performance achieved by the proposed structure.
    Keywords: ELECTRONICS AND ELECTRICAL ENGINEERING
    Type: Electronics Letters (ISSN 0013-5194); 27; 990
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    NASA TECHNICAL REPORTS
  • 7
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    Multibit oversampled Sigma-Delta A/D convertor with nonuniform quantisation (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Nonuniformly quantized multibit oversampled Sigma-Delta A/D convertors are proposed which achieve high SNR over a wide dynamic range. Simulation results are presented for first- and second-order 4 bit Sigma-Delta A/D convertors with companding internal quantizers.
    Keywords: ELECTRONICS AND ELECTRICAL ENGINEERING
    Type: Electronics Letters (ISSN 0013-5194); 27; 528
    Format: text
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    NASA TECHNICAL REPORTS
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