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  • Comparative Studies. Non-European Languages/Literatures  (6)
  • 1
    Online Resource
    Online Resource
    The acoustic field of a pulsed Doppler diagnostic ultrasound system near a pressure-release surface
    Acoustical Society of America (ASA) ; 1994
    In:  The Journal of the Acoustical Society of America Vol. 95, No. 5_Supplement ( 1994-05-01), p. 2855-2855
    Details
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 95, No. 5_Supplement ( 1994-05-01), p. 2855-2855
    Abstract: Extravasation of blood cells has been observed in the lungs of mice and monkeys exposed to pulsed ultrasound conditions comparable to diagnostic levels [Child et al., Ultrasound Med. Biol. 16, 817–825 (1990) and A. F. Tarantal and D. R. Canfield, Ultrasound Med. Biol. (in press)]. In order to understand the ultrasound exposure conditions under which damage occurs, lung was modeled as a simple interface from water to air. The acoustic pressure output of an Advanced Technology Laboratories Ultramark 9 High Definition ImagingR system with a 5-MHz linear array transducer in pulsed Doppler mode (4 MHz) was interrogated near the pressure release surface (≤3 mm) with a Marconi 0.5-mm bilaminar membrane-type PVDF hydrophone. For the nonlinear waveforms produced, peak negative pressures of 2.0 MPa measured in free filed were increased to 4.5 MPa due to constructive interference near the interface. The behavior of the pressure release surface was also simulated computationally as a low-pass filter with a 180° phase shift. The impulse response of the interface was constructed using experimentally measured spectra of the incoming and reflected waves. The pressure waveform was calculated as a function of position by superimposing the incoming and reflected waves and was compared to the hydrophone measurements. The implications of these observations on in situ acoustic exposure near lung will be discussed.
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/1.409523
    RVK:
    EQ 1000
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 1994
    detail.hit.zdb_id: 1461063-2
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  • 2
    Online Resource
    Online Resource
    Reynolds number effects on flow/acoustic mechanisms in spherical windscreens
    Acoustical Society of America (ASA) ; 2003
    In:  The Journal of the Acoustical Society of America Vol. 113, No. 1 ( 2003-01-01), p. 161-166
    Details
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 113, No. 1 ( 2003-01-01), p. 161-166
    Abstract: There is a practical need to fully understand the mechanisms involved in the flow/pressure fluctuations around a screened microphone. A stream of uniform flow with low-frequency turbulence encountering a rigid, impermeable spherical windscreen is considered in this study. Pressure distributions on the surface of the sphere are determined by the flow structure. Pressure fluctuations at the center of the sphere are then calculated based on the integration of surface pressure distributions. Because of the low-frequency assumption, results from steady-state laminar flows can be used to investigate the Reynolds number effects on wind noise reduction. Three types of flow have been studied in this paper: an inviscid case, a low-Reynolds-number Stokes flow, and intermediate- and high-Reynolds-number flows. A Reynolds-number/wind-noise-reduction correlation shows that the wind noise reduction increases with decreasing Reynolds number.
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/1.1527927
    RVK:
    EQ 1000
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 2003
    detail.hit.zdb_id: 1461063-2
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  • 3
    Online Resource
    Online Resource
    A computational study of the effect of windscreen shape and flow resistivity on turbulent wind noise reduction
    Acoustical Society of America (ASA) ; 2011
    In:  The Journal of the Acoustical Society of America Vol. 129, No. 4 ( 2011-04-01), p. 1740-1747
    Details
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 129, No. 4 ( 2011-04-01), p. 1740-1747
    Abstract: In this paper, numerical simulations are used to study the turbulent wind noise reduction effect of microphone windscreens with varying shapes and flow resistivities. Typical windscreen shapes consisting of circular, elliptical, and rectangular cylinders are investigated. A turbulent environment is generated by placing a solid circular cylinder upstream of the microphone. An immersed-boundary method with a fifth-order weighted essentially non-oscillatory scheme is implemented to enhance the simulation accuracy for high-Reynolds number flow around the solid cylinder as well as at the interface between the open air and the porous material comprising the windscreen. The Navier–Stokes equations for incompressible flow are solved in the open air. For the flow inside the porous material, a modified form of the Zwikker–Kosten equation is solved. The results show that, on average, the circular and horizontal ellipse windscreens have similar overall wind noise reduction performance, while the horizontal ellipse windscreen with medium flow resistivity provides the most effective wind noise reduction among all the considered cases. The vertical ellipse windscreen with high flow resistivity, in particular, increases the wind noise because of increased self-generation of turbulence.
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/1.3552886
    RVK:
    EQ 1000
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 2011
    detail.hit.zdb_id: 1461063-2
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  • 4
    Online Resource
    Online Resource
    A sidelobe suppressing near-field beamforming approach for ultrasound array imaging
    Acoustical Society of America (ASA) ; 2015
    In:  The Journal of the Acoustical Society of America Vol. 137, No. 5 ( 2015-05-01), p. 2785-2790
    Details
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 137, No. 5 ( 2015-05-01), p. 2785-2790
    Abstract: A method is proposed to suppress sidelobe level for near-field beamforming in ultrasound array imaging. An optimization problem is established, and the second-order cone algorithm is used to solve the problem to obtain the weight vector based on the near-field response vector of a transducer array. The weight vector calculation results show that the proposed method can be used to suppress the sidelobe level of the near-field beam pattern of a transducer array. Ultrasound images following the application of weight vector to the array of a wire phantom are obtained by simulation with the Field II program, and the images of a wire phantom and anechoic sphere phantom are obtained experimentally with a 64-element 26 MHz linear phased array. The experimental and simulation results agree well and show that the proposed method can achieve a much lower sidelobe level than the conventional delay and sum beamforming method. The wire phantom image is demonstrated to focus much better and the contrast of the anechoic sphere phantom image improved by applying the proposed beamforming method.
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/1.4919318
    RVK:
    EQ 1000
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 2015
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  • 5
    Online Resource
    Online Resource
    Episodic memory does not add up: Verbatim–gist superposition predicts violations of the additive law of probability
    Elsevier BV ; 2015
    In:  Journal of Memory and Language Vol. 84 ( 2015-10), p. 224-245
    Details
    In: Journal of Memory and Language, Elsevier BV, Vol. 84 ( 2015-10), p. 224-245
    Type of Medium: Online Resource
    ISSN: 0749-596X
    URL: Article
    DOI: 10.1016/j.jml.2015.06.006
    RVK:
    EQ 1000
    RVK:
    EQ 2690
    Language: English
    Publisher: Elsevier BV
    Publication Date: 2015
    detail.hit.zdb_id: 1469677-0
    SSG: 5,2
    SSG: 7,11
    SSG: 5,3
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  • 6
    Online Resource
    Online Resource
    Temporal coordination of vocal turn taking between mothers and their children with hearing loss
    Acoustical Society of America (ASA) ; 2019
    In:  The Journal of the Acoustical Society of America Vol. 145, No. 3_Supplement ( 2019-03-01), p. 1731-1731
    Details
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 145, No. 3_Supplement ( 2019-03-01), p. 1731-1731
    Abstract: Normal-hearing (NH) infants participate in social exchanges soon after birth. What does vocal turn-taking look like in children with hearing loss after cochlear implantation? The study examined the prevalence and temporal structure of vocal turns during spontaneous interactions between mothers and their children with cochlear implants (CIs) over the first year after implantation compared to interactions between mothers and children with normal hearing. Mothers’ play with children with CIs (n = 12) were recorded at 3 (mean age 18.3 mo) and 9 (mean age 27.5 mo) months post CI. Mothers with age-matched hearing children (n = 12) were recorded at the corresponding time points. The CI group initially differed from the NH group in several ways (i.e., fewer vocal turns, more simultaneous speech, and longer between-speaker pauses) but progressed to NH levels by 9 months post CI, demonstrating the positive effects of CIs. Dyadic effects were also observed in the timing of mothers’ responses, which were related to those of their children. However, children with CIs continued to show an atypical pattern in the relative timing of between- vs within-speaker pauses across both test sessions, indicating a potentially protracted time course for the influence of CIs on dyadic interactions.
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/1.5101356
    RVK:
    EQ 1000
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 2019
    detail.hit.zdb_id: 1461063-2
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