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  • Comparative Studies. Non-European Languages/Literatures  (2)
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  • Comparative Studies. Non-European Languages/Literatures  (2)
RVK
  • 1
    Online Resource
    Online Resource
    An automated coupler calibration system for laboratory standard condenser microphones
    Acoustical Society of America (ASA) ; 1978
    In:  The Journal of the Acoustical Society of America Vol. 64, No. S1 ( 1978-11-01), p. S8-S8
    Details
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 64, No. S1 ( 1978-11-01), p. S8-S8
    Abstract: An automated coupler calibration system for laboratory standard condenser microphones is manufactured for trial use. Active couplers whose cylindrical wall vibrates as a sound source are designed. These couplers are used so as to get pressure response levels of microphones in a short time and to reduce manual transaction. A microcomputer controls the system, processes measured values, examines them, and stores final results in a diskette. In addition, many digital techniques are adopted for noise reduction and for the convenience of calibration. Accuracies were tested for 1-in. condenser microphones, such as MR103, using a coupler which has the same dimensions as the 20-cm3 a coupler. Pressure response levels calibrated by the system agree well with those calibrated by the ordinary precise coupler calibration system within 0.2 dB at the frequencies 100–10 000 Hz.
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/1.2004442
    RVK:
    EQ 1000
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 1978
    detail.hit.zdb_id: 1461063-2
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    Online Resource
  • 2
    Online Resource
    Online Resource
    Observing barotropic currents and tides in the Kuroshio Extension region from long-range reciprocal acoustic transmissions
    Acoustical Society of America (ASA) ; 2001
    In:  The Journal of the Acoustical Society of America Vol. 110, No. 5_Supplement ( 2001-11-01), p. 2726-2726
    Details
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 110, No. 5_Supplement ( 2001-11-01), p. 2726-2726
    Abstract: Travel times of reciprocal acoustic transmissions from a 5-transceiver acoustic tomography array over a 1000-km-scale domain in the Kuroshio Extension (KE) region during summer 1997 are used to investigate the barotropic tidal currents and range-averaged large-scale low-frequency currents as well as their relative vorticity. Inverse techniques are employed to estimate the low-frequency range-and-depth averaged (barotropic) currents every 3 or 6 h from the differential acoustic travel times. Eight major tidal constituent amplitudes and phases derived from the high-frequency acoustic travel times agree well with those found from the TOPEX/POSEIDON tidal model TPXO.5 [Egbert et al., 1994]. The results show that the range-averaged barotropic currents along the section in the KE recirculation gyre flowed westward in about 4 cm/s with an uncertainty of 0.8 mm/s; this is consistent with the result of the ADCP survey on WOCE P-14N experiment, and comparable with the surface geostrophic current velocity 5 m/s determined from the SSHA of the TOPEX/POSEIDON altimeter, indicating that barotropic currents are dominant in the Kuroshio Extension recirculation gyre. Estimated daily averaged relative vorticity over a 155 & lt;th & gt;000 km2 area in the KE recirculation region has a near-zero mean (1.84×10−7 s−1).
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/1.4777441
    RVK:
    EQ 1000
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 2001
    detail.hit.zdb_id: 1461063-2
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
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