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  • Acoustics
  • 1990-1994
  • 1985-1989  (5)
  • 1950-1954
  • 1930-1934  (2)
  • 1989  (5)
  • 1932  (2)
  • 1
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    In:  IEEE Trans. on Signal Processing, Berlin, Ges. f. Geowissenschaften e.V., vol. 37, no. 1, pp. 265-274, pp. RG1003, 25 pp., (ISSN 0343-5164)
    Publication Date: 1989
    Keywords: Filter- ; Borehole geophys. ; Acoustics
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  • 2
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    In:  Gerlands Beiträge zur Geophysik, Milano, Gustav Fischer, vol. 35, no. 3, pp. 46-50, pp. L24306, (ISBN: 0534351875, 2nd edition)
    Publication Date: 1932
    Keywords: Velocity analysis ; Meteorology ; Acoustics
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  • 3
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    Springer
    In:  Bull., Open-File Rept., Lecture Notes in Earth Sciences, Berlin, Springer, vol. 89, no. 1, pp. Paper A 25 - A 34, (ISBN 1-86239-165-3, vi + 330 pp.)
    Publication Date: 1989
    Keywords: Seismics (controlled source seismology) ; Textbook of geophysics ; Acoustics
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  • 4
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    Bornträger
    In:  Professional Paper, Handbuch der Geophysik, Volume 9: Physik der Atmosphäre 2 (only 1., 2., and 3. part), 8 + 698 S., Berlin, Bornträger, vol. 3, no. VIIa, pp. 89-145, (ISBN: 3-540-23712-7)
    Publication Date: 1932
    Keywords: Meteorology ; Wave propagation ; Acoustics
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  • 5
    Publication Date: 1989-10-27
    Description: According to the place principles of the classical hearing theory, the physical entity frequency is encoded in the auditory periphery as place information (tonotopic representation), which is decoded in more central parts of the auditory system to form the subjective entity pitch. However, this relation is true only for pure-tone signals (spectral pitch); it can be quite different in the case of complex auditory stimuli (virtual pitch), thus requiring a multistage process for pitch formation. Neuromagnetic measurements showed that the tonotopic organization of the primary auditory cortex reflects the pitch rather than the frequency of the stimulus; that is, the pitch formation process must take place in subcortical regions.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Pantev, C -- Hoke, M -- Lutkenhoner, B -- Lehnertz, K -- New York, N.Y. -- Science. 1989 Oct 27;246(4929):486-8.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Institute of Experimental Audiology, University of Munster, Federal Republic of Germany.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2814476" target="_blank"〉PubMed〈/a〉
    Keywords: Acoustic Stimulation ; Acoustics ; Audiometry/methods ; Auditory Cortex/*physiology ; Brain Mapping ; Humans ; Magnetics ; Pitch Perception/*physiology
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 6
    Publication Date: 2018-06-05
    Description: The proposed ducted fan engine has prompted the need for increasingly lightweight and efficient noise control devices. Exploratory tests at the NASA Langley Research Center were conducted to evaluate three piezoelectric specimens as possible control transducers: a Polyvinylidene Flouride (PVDF) piezofilm sample and two composite samples of Lead Zirconate Titanate (PZT) rods embedded in fiberglass. The tests measured the acoustic output efficiency and evaluated the noise control characteristics when interacting with a primary sound source. The results showed that a PZT sample could diminish the reflected acoustic waves. However, the PZT acoustic output must increase by several orders of magnitude to qualify as a control transducer for the ducted fan engine.
    Keywords: Acoustics
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  • 7
    Publication Date: 2019-08-28
    Description: An ultrasonic apparatus determines crack opening load by placing a transmit transducer on one side of the crack and a receive transducer on the opposite side of the crack. An acoustic signal passing through a region of the crack is mechanically rectified to produce a second harmonic of an input signal. A harmonic output signal of the receive transducer is converted into an electrical signal and the peak harmonic amplitude is determined while increasing a tension load on the specimen. The peak harmonic amplitude indicates crack opening load.
    Keywords: Acoustics
    Format: application/pdf
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