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  • 1
    Online Resource
    Online Resource
    Silver Medal in Physical Acoustics 2019: James M. Sabatier
    Acoustical Society of America (ASA) ; 2019
    In:  The Journal of the Acoustical Society of America Vol. 146, No. 4_Supplement ( 2019-10-01), p. 2975-2978
    Details
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 146, No. 4_Supplement ( 2019-10-01), p. 2975-2978
    Abstract: The Silver Medal is presented to individuals, without age limitation, for contributions to the advancement of science, engineering, or human welfare through the application of acoustic principles, or through research accomplishment in acoustics.
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/1.5137312
    RVK:
    EQ 1000
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 2019
    detail.hit.zdb_id: 1461063-2
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  • 2
    Online Resource
    Online Resource
    Outdoor pulse echo speed of sound measurement for all ages.
    Acoustical Society of America (ASA) ; 2008
    In:  The Journal of the Acoustical Society of America Vol. 124, No. 4_Supplement ( 2008-10-01), p. 2569-2569
    Details
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 124, No. 4_Supplement ( 2008-10-01), p. 2569-2569
    Abstract: One of the major thrusts of ASA Vision 2010 is to develop education outreach for a spectrum of learners from kindergarten students to senior citizens. Along these lines we explore a simple speed of sound measurement that can be accomplished by this broad range of learners. Understanding slow speed of sound compared to the speed of light allows the learner to comprehend the lack of temporal/optical correlation between sound and position of airplanes as they move across the sky. Other examples include the late arrival of sounds from aerial salutes during firework displays and sounds of lightning during storms. Synchronizing the acoustic echo of a sound pulse from an outdoor wall with the pulsed source for several duty cycles allows sound speed measurements. Analysis of the time of arrival with distance is presented for various wall sizes and air temperatures. The successes of the learning exercise and results of the measurements when accomplished by the K-gray audience will be presented (see, for example, http://arts.ucsc.edu/EMS/Music/tech_background/TE-01/soundSpeed.html).
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/1.4783106
    RVK:
    EQ 1000
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 2008
    detail.hit.zdb_id: 1461063-2
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  • 3
    Online Resource
    Online Resource
    Sound speeds and absorptions in a sandy sediment
    Acoustical Society of America (ASA) ; 1995
    In:  The Journal of the Acoustical Society of America Vol. 98, No. 5_Supplement ( 1995-11-01), p. 2977-2977
    Details
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 98, No. 5_Supplement ( 1995-11-01), p. 2977-2977
    Abstract: A sediment tank 11 ft deep and 10 ft in diameter has been installed at the National Center for Physical Acoustics. This tank has been instrumented with a vertical array of B & K 8103 hydrophones along the axis of the tank, and has been filled with washed ‘‘pit run’’ sand. In studying the sound transmission through the sediment, the hydrophones are used both as senders and receivers. The tank is being used to develop ‘‘shaded’’ array transducers for sub-bottom profiling for measuring sound speeds and absorptions in sediments. Difficulties have been experienced in getting a homogeneous sediment. However, two distinct waves have been observed. The first is a fast wave with a velocity equal to approximately 1600 m/s that propagates readily at frequencies up to 100 kHz. The second is a much slower wave that cuts off above 2 kHz and has a velocity of a few hundred meters per second. Experiments are under way to determine the frequency dependence off the speed and absorption of these two waves. Calculations are being made in an effort to explain theoretically the experimental results. [Work supported by ONR, MMRI.]
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/1.413940
    RVK:
    EQ 1000
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 1995
    detail.hit.zdb_id: 1461063-2
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  • 4
    Online Resource
    Online Resource
    An experimental investigation of the propagation of sound over a flat rough surface of finite impedance
    Acoustical Society of America (ASA) ; 1995
    In:  The Journal of the Acoustical Society of America Vol. 97, No. 5_Supplement ( 1995-05-01), p. 3240-3240
    Details
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 97, No. 5_Supplement ( 1995-05-01), p. 3240-3240
    Abstract: Recent work on rough surfaces by Medwin et al. [ 657–665 (1986)] has indicated the presence of acoustic boundary waves in the fluid directly above rough surfaces with high acoustic impedances. The effect of this boundary wave is that the sound field above the rough surface is louder than it would have been over a similarly smooth surface at close ranges due to multiple coherent scattering. The opposite is true at longer ranges since the scattering becomes incoherent. The ranges of coherent and incoherent scattering depend on the roughness scale and frequency of the sound source. The experimental work described above was performed over surfaces with high acoustic impedances such as wax and steel. The purpose of this present work is to find out if similar trends exist in the propagation of sound over rough surfaces that possess a lower acoustic impedance. Sound signals will be measured above a rough surface and compared to the signal above a smooth surface of the same material. Preliminary experiments using Styrofoam indicate that similar trends exist above the low impedance rough surface as did over the high impedance rough surfaces. [Work supported by USDA.]
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/1.411729
    RVK:
    EQ 1000
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 1995
    detail.hit.zdb_id: 1461063-2
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  • 5
    Online Resource
    Online Resource
    Utilizing a modified surface roughness parameter for describing rough surfaces with an equivalent impedance
    Acoustical Society of America (ASA) ; 1997
    In:  The Journal of the Acoustical Society of America Vol. 102, No. 5_Supplement ( 1997-11-01), p. 3112-3112
    Details
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 102, No. 5_Supplement ( 1997-11-01), p. 3112-3112
    Abstract: Previous experimental and field work has shown that rough surfaces may be modeled acoustically as though they were smooth surfaces with a modified surface impedance. In these works the roughness length scale used was a single parameter equal to 1/2 of the average height of the surface roughness elements. Recent experiments have suggested that this simple form for the roughness parameter may yield incorrect results for certain conditions such as grazing incidence over impermeable surfaces or sparsely scattered roughness elements. Modifications to this roughness parameter will be investigated. Specifically, the influence of the slope of the roughness elements, which is quantified using the standard deviation in height and the correlation length, will be investigated. [Work supported by the USDA ARS National Sedimentation Laboratory.]
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/1.420553
    RVK:
    EQ 1000
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 1997
    detail.hit.zdb_id: 1461063-2
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  • 6
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    Online Resource
    Recent advances in utilizing acoustics to study surface roughness in agricultural surfaces
    Elsevier BV ; 2002
    In:  Applied Acoustics Vol. 63, No. 7 ( 2002-07), p. 795-812
    Details
    In: Applied Acoustics, Elsevier BV, Vol. 63, No. 7 ( 2002-07), p. 795-812
    Type of Medium: Online Resource
    ISSN: 0003-682X
    URL: Article
    DOI: 10.1016/S0003-682X(01)00057-3
    Language: English
    Publisher: Elsevier BV
    Publication Date: 2002
    detail.hit.zdb_id: 1501311-X
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  • 7
    Online Resource
    Online Resource
    Further investigations on the propagation of sound over flat rough finite impedance surfaces
    Acoustical Society of America (ASA) ; 1995
    In:  The Journal of the Acoustical Society of America Vol. 98, No. 5_Supplement ( 1995-11-01), p. 2925-2925
    Details
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 98, No. 5_Supplement ( 1995-11-01), p. 2925-2925
    Abstract: The propagation of sound over rough surfaces of finite impedance is investigated. Initial experiments have illustrated the excess attenuation caused by roughness, that is, attenuation above and beyond that caused by geometrical spreading alone. These initial experiments were conducted indoors in a well-controlled setting for sound at grazing incidence. These measurements also show good agreement with Attenborough’s proposed model [J. Acoust. Soc. Am. 95(5), 2838(A) (1994)] that incorporates the effects of roughness into an effective admittance. The purpose of this present work is to find out if these trends persist in the propagation of sound over rough surfaces in a real-world setting. Sound signals will be measured above both rough and smooth agricultural surfaces with varying roughness profiles. Additional measurements will be made to determine the impedance and wave number of the surface as well as the roughness profile in order to examine Attenborough’s model in more detail. [Work supported by USDA.]
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/1.414181
    RVK:
    EQ 1000
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 1995
    detail.hit.zdb_id: 1461063-2
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  • 8
    Online Resource
    Online Resource
    Acoustic propagation over rough soil surfaces
    Acoustical Society of America (ASA) ; 1996
    In:  The Journal of the Acoustical Society of America Vol. 100, No. 4_Supplement ( 1996-10-01), p. 2747-2747
    Details
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 100, No. 4_Supplement ( 1996-10-01), p. 2747-2747
    Abstract: The propagation of sound over finite impedance rough surfaces is investigated. Laboratory experiments have illustrated that roughness can be treated as an effective impedance in propagation models. This finding holds for high- and low-impedance surfaces and is valid for propagation at grazing and nongrazing incidence. The purpose of this present work is to find out if these trends persist in the propagation of sound over rough soil surfaces outdoors. Of specific interest is the inverse problem of determining the roughness scale from the acoustic propagation. Previous field measurements were unable to separate the attenuation due to roughness and that due to the changes in the ground impedance caused by creating the roughness. Future experiments will examine surfaces that have been sufficiently weathered so that the parameters that influence impedance, such as porosity and flow resistivity, are comparable between rough surfaces and nearby smooth surfaces. [Work supported by USDA.]
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/1.416877
    RVK:
    EQ 1000
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 1996
    detail.hit.zdb_id: 1461063-2
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  • 9
    Online Resource
    Online Resource
    Grazing incidence propagation over a soft rough surface
    Acoustical Society of America (ASA) ; 1997
    In:  The Journal of the Acoustical Society of America Vol. 102, No. 1 ( 1997-07-01), p. 55-59
    Details
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 102, No. 1 ( 1997-07-01), p. 55-59
    Abstract: Attenborough has recently proposed [J. Acoust. Soc. Am. 98, 1717–1722 (1995)] that the effects of surface roughness on an otherwise flat surface of finite acoustic admittance can be modeled as a smooth flat surface with an effective acoustic admittance β*. This effective admittance is determined by the normalized admittance βs and wave number ks of the original smooth surface, as well as a surface roughness parameter σν. Attenborough tested his theory by conducting excess attenuation measurements over plywood and Styrofoam surfaces with two-dimensional roughness elements. Specifically, he investigated the interference pattern between the direct and reflected signals over both smooth and rough surfaces. Experiments are conducted here with three-dimensional roughness elements at grazing incidence. Such a configuration is typical for outdoor sound propagation problems. The results presented here generally confirm Attenborough’s model and open up the analogy to a broader class of problems. It was also found that placing the effective admittance plane at the top of the roughness elements rather than at the bottom yielded slightly better results for the higher acoustic frequencies investigated.
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/1.419728
    RVK:
    EQ 1000
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 1997
    detail.hit.zdb_id: 1461063-2
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  • 10
    Online Resource
    Online Resource
    Experimental and modeling results for near-grazing propagation over rough surfaces
    Acoustical Society of America (ASA) ; 1999
    In:  The Journal of the Acoustical Society of America Vol. 105, No. 2_Supplement ( 1999-02-01), p. 1079-1079
    Details
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 105, No. 2_Supplement ( 1999-02-01), p. 1079-1079
    Abstract: Recent experimental work on acoustic propagation over rough surfaces has shown intriguing propagation effects ranging from frequency shifts in the ground interference dip to surface wavelike phenomena. Attempts to model the observed data with an effective impedance formulation have had some success but have met with some problems for certain propagation geometries and surface configurations. Experimental data and modeling results will be presented and discussed for a variety of surfaces ranging in surface properties from impermeable to loosely packed soil and ranging in surface roughness scales from low sloped perturbations to steeply sloped wedges.
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/1.424837
    RVK:
    EQ 1000
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 1999
    detail.hit.zdb_id: 1461063-2
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