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  • 2010-2014  (3)
  • Comparative Studies. Non-European Languages/Literatures  (3)
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  • 2010-2014  (3)
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  • Comparative Studies. Non-European Languages/Literatures  (3)
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  • 1
    Online Resource
    Online Resource
    Correlations between ultrasonic guided wave velocities and bone properties in bovine tibia in vitro
    Acoustical Society of America (ASA) ; 2012
    In:  The Journal of the Acoustical Society of America Vol. 131, No. 5 ( 2012-05-01), p. EL375-EL381
    Details
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 131, No. 5 ( 2012-05-01), p. EL375-EL381
    Abstract: Correlations between ultrasonic guided wave velocities and bone properties were investigated in bovine tibia in vitro. The velocities of the first arriving signal and the slow guided wave, termed VFAS and VSGW, along the long axis of the tibia were measured at 200 kHz in 20 bovine tibiae using the axial transmission technique. VFAS yielded significant negative correlation coefficients of −0.54 to −0.66 with the bone properties. In contrast, VSGW yielded strong positive correlation coefficients of 0.68–0.84. The best univariate predictor of VFAS and VSGW was the cortical thickness yielding adjusted squared correlation coefficients of 0.41 and 0.69, respectively.
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/1.3699532
    RVK:
    EQ 1000
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 2012
    detail.hit.zdb_id: 1461063-2
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    Online Resource
  • 2
    Online Resource
    Online Resource
    Maximization of acoustic energy difference between two spaces
    Acoustical Society of America (ASA) ; 2010
    In:  The Journal of the Acoustical Society of America Vol. 128, No. 1 ( 2010-07-01), p. 121-131
    Details
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 128, No. 1 ( 2010-07-01), p. 121-131
    Abstract: There has recently been an increasing interest in the generation of a sound field that is audible in one spatial region and inaudible in an adjacent region. The method proposed here ensures the control of the amplitude and phase of multiple acoustic sources in order to maximize the acoustic energy difference between two adjacent regions while also ensuring that evenly distributed source strengths are used. The performance of the method proposed is evaluated by computer simulations and experiments with real loudspeaker arrays in the shape of a circle and a sphere. The proposed method gives an improvement in the efficiency of radiation into the space in which the sound should be audible, while maintaining the acoustic pressure difference between two acoustic spaces. This is shown to give an improvement of performance compared to the contrast control method previously proposed.
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/1.3438479
    RVK:
    EQ 1000
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 2010
    detail.hit.zdb_id: 1461063-2
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    Online Resource
  • 3
    Online Resource
    Online Resource
    Optimal design of surface wave emats for enhancing their ultrasonic signal strength
    Acoustical Society of America (ASA) ; 2012
    In:  The Journal of the Acoustical Society of America Vol. 131, No. 4_Supplement ( 2012-04-01), p. 3466-3466
    Details
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 131, No. 4_Supplement ( 2012-04-01), p. 3466-3466
    Abstract: The strength of the ultrasonic signal transmitted by electromagnetic acoustic transducers (EMATs) is very weak, which severely confines the further expansion of the application scope of EMATs. To solve this problem, the features of the transmission process of a surface wave EMAT are studied based on a 3-D model. Simulation reveals that performances of the transducer are significantly affected by its parameters. Aiming at enhancing the strength of the ultrasonic signal, this paper investigates the influence of EMAT parameters on the ultrasound field of the transducer and accomplishes the optimal design of the EMAT by utilizing orthogonal test method. Experiments indicate that after optimization, the received signal of the EMAT has increased by 162.3%, which suggests the ultrasonic signal of EMATs can be effectively enhanced by utilizing orthogonal test method based on the 3-D EMAT model. Acknoweledgement: Supported by “the Fundamental Research Funds for Central Universities” (Grant No. HIT. NSRIF. 2012008)
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/1.4709067
    RVK:
    EQ 1000
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 2012
    detail.hit.zdb_id: 1461063-2
    Location Call Number Limitation Availability
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    Online Resource
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