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  • 1970-1974  (5)
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Years
Year
  • 1
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    The full plastic moment of an I-beam in the presence of shear force (1970)
    Elsevier
    Details
    Publication Date: 1970-10-01
    Print ISSN: 0022-5096
    Electronic ISSN: 1873-4782
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Published by Elsevier
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    PAPER CURRENT
  • 2
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    Ultrasonic signal enhancement by resonator techniques (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Ultrasonic resonators increase experimental sensitivity to acoustic dispersion and changes in attenuation. Experimental sensitivity enhancement line shapes are presented which were obtained by modulating the acoustic properties of a CdS resonator with a light beam. Small changes in light level are made to produce almost pure absorptive or dispersive changes in the resonator signal. This effect is due to the coupling of the ultrasonic wave to the CdS conductivity which is proportional to incident light intensity. The resonator conductivity is adjusted in this manner to obtain both dispersive and absorptive sensitivity enhancement line shapes. The data presented verify previous thoretical calculations based on a propagating wave model.
    Keywords: PHYSICS, GENERAL
    Type: NASA-TN-D-7417 , L-9144
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Verification of sensitivity enhancement factors for CW ultrasonic resonators. (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Sensitivity enhancement factors predicted by an analysis of CW ultrasonic resonator systems using the propagating wave model are verified. Absorption and dispersion sensitivity factors were obtained by producing small changes in the acoustic properties of a CdS resonator with a light beam.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Journal of Applied Physics; 44; Aug. 197
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Ultrasonic calibration device (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Device is an instrument for producing known changes in both acoustic absorption and phase velocity. Calibration signal arises from actual change of acoustic parameters, not from electrical simulation. Instrument is able to simulate changes in sensitivity enhancement achieved by use of ultrasonic resonators, which cannot be achieved using electrical calibration techniques.
    Keywords: PHYSICAL SCIENCES
    Type: LAR-11435
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    A transmission oscillator ultrasonic spectrometer (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: A continuous wave ultrasonic instrument capable of measuring very small changes in acoustic attenuation and phase velocity is described. This transmission oscillator ultrasonic spectrometer (TOUS) exhibits high sensitivity because it oscillates marginally. In spite of this high sensitivity, the TOUS system is relatively simple, compact, and inexpensive. These features suggest that the TOUS is suitable not only for precise laboratory measurements of the physical properties of materials, but also for field applications in nondestructive testing.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: AD-782496 , AFOSR-74-1051TR , Review of Scientific Instruments; 45; Mar. 197
    Format: text
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    NASA TECHNICAL REPORTS
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