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  • Acoustics
  • 1990-1994  (5)
  • 1980-1984
  • 1960-1964
  • 1925-1929  (4)
  • 2017
  • 1993  (5)
  • 1926  (4)
  • 1
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    Die Geschwindigkeit des Schalls in der Atmosphäre (1926)
    In:  Physikalische Zeitschrift, Jena, Gustav Fischer, vol. 27, no. 3, pp. 84-86, pp. L24306, (ISBN: 0534351875, 2nd edition)
    Details
    Publication Date: 1926
    Keywords: Meteorology ; Acoustics
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    BIBLIOGRAPHY SEISMOLOGY
  • 2
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    Die Entstehung der anomalen Schallzonen bei Explosionen (1926)
    In:  Zeitschrift für Geophysik, Jena, Gustav Fischer, vol. 2, no. 3, pp. 260-266, pp. L24306, (ISBN: 0534351875, 2nd edition)
    Details
    Publication Date: 1926
    Keywords: Waves ; Acoustics
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    BIBLIOGRAPHY SEISMOLOGY
  • 3
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    Über die Ausbreitung des Schalls in der Atmosphäre (1926)
    In:  Die Naturwissenschaften, Jena, Gustav Fischer, vol. 14, no. 3, pp. 338-342, pp. L24306, (ISBN: 0534351875, 2nd edition)
    Details
    Publication Date: 1926
    Keywords: Waves ; Meteorology ; Acoustics
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    BIBLIOGRAPHY SEISMOLOGY
  • 4
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    Underwater Scattering and Radiation (1993)
    Academic Press
    In:  Boston, Academic Press, vol. XXII, no. Publ. No. 12, pp. 127, (3-540-43395-3)
    Details
    Publication Date: 1993
    Keywords: Acoustics ; Textbook of geophysics ; Textbook of physics ; Scattering ; Sea seismics ; Elasticity ; Waves
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    BIBLIOGRAPHY SEISMOLOGY
  • 5
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    Die Schallgeschwindigkeit in den untersten Schichten der Atmosphäre (1926)
    In:  Zeitschrift für Geophysik, Jena, Gustav Fischer, vol. 2, no. 3, pp. 101-106, pp. L24306, (ISBN: 0534351875, 2nd edition)
    Details
    Publication Date: 1926
    Keywords: Meteorology ; Acoustics
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    BIBLIOGRAPHY SEISMOLOGY
  • 6
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    Movement Limitation and Immune Responses of Rhesus Monkeys (1993)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The effects of restraint on immunological parameters was determined in an 18 day ARRT (adult rhesus restraint test). The monkeys were restrained for 18 days in the experimental station for the orbiting primate (ESOP), the chair of choice for Space Shuttle experiments. Several immunological parameters were determined using peripheral blood, bone marrow, and lymph node specimens from the monkeys. The parameters included: response of bone marrow cells to GM-CSF (granulocyte-macrophage colony stimulating factor), leukocyte subset distribution, and production of IFN-alpha (interferon-alpha) and IFN-gamma (interferon-gamma). The only parameter changed after 18 days of restraint was the percentage of CDB+ T cells. No other immunological parameters showed changes due to restraint. Handling and changes in housing prior to the restraint period did apparently result in some restraint-independent immunological changes. Handling must be kept to a minimum and the animals allowed time to recover prior to flight. All experiments must be carefully controlled. Restraint does not appear to be a major issue regarding the effects of space flight on immune responses.
    Keywords: Acoustics
    Type: NASA-CR-203757 , NAS 1.26:203757
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    NASA TECHNICAL REPORTS
  • 7
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    Fan Noise Prediction System Development: Source/Radiation Field Coupling and Workstation Conversion for the Acoustic Radiation Code (1993)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The Acoustic Radiation Code (ARC) is a finite element program used on the IBM mainframe to predict far-field acoustic radiation from a turbofan engine inlet. In this report, requirements for developers of internal aerodynamic codes regarding use of their program output an input for the ARC are discussed. More specifically, the particular input needed from the Bolt, Beranek and Newman/Pratt and Whitney (turbofan source noise generation) Code (BBN/PWC) is described. In a separate analysis, a method of coupling the source and radiation models, that recognizes waves crossing the interface in both directions, has been derived. A preliminary version of the coupled code has been developed and used for initial evaluation of coupling issues. Results thus far have shown that reflection from the inlet is sufficient to indicate that full coupling of the source and radiation fields is needed for accurate noise predictions ' Also, for this contract, the ARC has been modified for use on the Sun and Silicon Graphics Iris UNIX workstations. Changes and additions involved in this effort are described in an appendix.
    Keywords: Acoustics
    Type: NASA-CR-204340 , NAS 1.26:204340
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    NASA TECHNICAL REPORTS
  • 8
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    Apparatus for acoustically coupling an ultrasonic transducer with a body (1993)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: An apparatus for acoustically coupling an ultrasonic transducer with a body along whose surface waves are to be transmitted includes a wedge having a first surface for acoustically contacting a subject surface area of a body to be measured, on which surface waves are to be transmitted, and a second surface for accoustically contacting an ultrasonic transducer. The wedge includes a cylinder in which the second surface is present and which is movably disposed in a recess in a block in which the first surface is present, for orienting the first surface and the second surface relative to each other so that ultrasonic waves emitted by the ultrasonic transducer generate surface waves which travel on the subject surface area of the body when the ultrasonic transducer is in acoustic contact with the second surface and the first surface is in acoustic contact with the subject surface area of the body. In the preferred embodiment, there is a third surface which is orientable relative to the first surface so that ultrasonic waves emitted by an ultrasonic transducer in contact with the third surface generate surface waves which travel on the subject surface area of the body when the first surface is an acoustic contact with the subject surface area of the body.
    Keywords: Acoustics
    Format: application/pdf
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  • 9
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    Consecutive Plate Acoustic Suppressor Apparatus and Methods (1993)
    In:  CASI
    Details
    Publication Date: 2019-08-26
    Description: An apparatus and method for suppressing acoustic noise utilizes consecutive plates, closely spaced to each other so as to exploit dissipation associated with sound propagation in narrow channels to optimize the acoustic resistance at a liner surface. The closely spaced plates can be utilized as high temperature structural materials for jet engines by constructing the plates from composite materials. Geometries of the plates, such as plate depth, shape, thickness, inter-plate spacing, arrangement, etc., can be selected to achieve bulk material-like behavior.
    Keywords: Acoustics
    Format: application/pdf
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