Sound‐Speed Modifying Acoustic Metasurfaces for Acoustic Holography
Sign Up to like & getrecommendations! Published in 2023 at "Advanced Materials"
DOI: 10.1002/adma.202208002
Abstract: Acoustic metasurfaces offer unique capabilities to steer and direct acoustic fields, though these are generally composed of complex 3D structures, complicating their fabrication and applicability to higher frequencies. Here, an ultrathin metasurface approach is demonstrated,… read more here.
Keywords: sound speed; speed modifying; acoustic metasurfaces; modifying acoustic ... See more keywords
Measuring Sound Speed in Gas Mixtures Using a Photoacoustic Generator
Sign Up to like & getrecommendations! Published in 2017 at "International Journal of Thermophysics"
DOI: 10.1007/s10765-017-2335-2
Abstract: We present a new method which allows us to percentage distinction of gas composition with a fast response time. This system uses the speed of sound in a resonant cell along with temperature to determine… read more here.
Keywords: measuring sound; gas; mixtures using; gas mixtures ... See more keywords
Acoustic sound speed profile inversion based on orthogonal matching pursuit
Sign Up to like & getrecommendations! Published in 2019 at "Acta Oceanologica Sinica"
DOI: 10.1007/s13131-019-1505-4
Abstract: The estimation of ocean sound speed profiles (SSPs) requires the inversion of an acoustic field using limited observations. Such inverse problems are underdetermined, and require regularization to ensure physically realistic solutions. The empirical orthonormal function… read more here.
Keywords: matching pursuit; orthogonal matching; sound; sound speed ... See more keywords
Study on sound-speed dispersion in a sandy sediment at frequency ranges of 0.5–3 kHz and 90–170 kHz
Sign Up to like & getrecommendations! Published in 2017 at "China Ocean Engineering"
DOI: 10.1007/s13344-017-0013-6
Abstract: In order to study the properties of sound-speed dispersion in a sandy sediment, the sound speed was measured both at high frequency (90–170 kHz) and low frequency (0.5–3 kHz) in laboratory environments. At high frequency,… read more here.
Keywords: high frequency; frequency; sound speed; speed dispersion ... See more keywords
Analytical relationship between sound relaxational absorption and sound speed dispersion in excitable gases
Sign Up to like & getrecommendations! Published in 2021 at "Journal of the Korean Physical Society"
DOI: 10.1007/s40042-021-00158-3
Abstract: Whether sound relaxational absorption and sound speed dispersion can be used as two independent acoustic parameters for gas sensing or not is still uncertain. In this paper, the analytical relationship between the frequency-dependent sound relaxational… read more here.
Keywords: speed dispersion; sound speed; sound relaxational; relaxational absorption ... See more keywords
Acoustic propagation analysis with a sound speed feature model in the front area of Kuroshio Extension
Sign Up to like & getrecommendations! Published in 2017 at "Applied Ocean Research"
DOI: 10.1016/j.apor.2017.08.001
Abstract: Abstract This paper aims to analyse acoustic-propagation character in the front area of Kuroshio Extension (KE). By analysing Argo data and the Sea surface height (SSH) data in this KEF area, a two-dimensional (2D) sound-speed… read more here.
Keywords: front area; area; model; acoustic propagation ... See more keywords
Effective sound speed in relativistic accretion discs around Schwarzschild black holes
Sign Up to like & getrecommendations! Published in 2019 at "New Astronomy"
DOI: 10.1016/j.newast.2018.12.001
Abstract: Abstract For low angular momentum axially symmetric accretion flow maintained in hydrostatic equilibrium along the vertical direction, the value of the Mach number at the critical points deviates from unity, resulting in the non-isomorphism of… read more here.
Keywords: black holes; accretion; schwarzschild black; around schwarzschild ... See more keywords
Sound speed in extended Chaplygin fluid
Sign Up to like & getrecommendations! Published in 2021 at "New Astronomy"
DOI: 10.1016/j.newast.2021.101569
Abstract: We consider an extended Chaplygin gas equation of state which is driven from Dbrane action and construct a cosmological model based on this equation of state. In this regard, we compute the scale factor of… read more here.
Keywords: equation; model; extended chaplygin; sound speed ... See more keywords
High frequency dependence of sound speed and attenuation in coral sand sediments
Sign Up to like & getrecommendations! Published in 2021 at "Ocean Engineering"
DOI: 10.1016/j.oceaneng.2021.109215
Abstract: Abstract The acoustic properties of seafloor coral sand sediments are of significant meaning for accurately modeling underwater sound propagation in sea areas around coral reef islands. To ultrasonically measure coral sand sediments with different grain… read more here.
Keywords: coral sand; attenuation; frequency; sound speed ... See more keywords
A Robust Method for Ultrasound Beamforming in the Presence of Off‐Axis Clutter and Sound Speed Variation
Sign Up to like & getrecommendations! Published in 2018 at "Ultrasonics"
DOI: 10.1016/j.ultras.2018.04.011
Abstract: HIGHLIGHTSWe introduced a model‐based beamforming algorithm.We assessed the algorithm's limitation and ability to suppress off‐axis scattering.We tested the performance of ADMIRE in the presence of gross sound speed deviation. ABSTRACT Previously, we introduced a model‐based… read more here.
Keywords: clutter; presence; admire; model ... See more keywords
2D speed of sound mapping using a multilook reflection ultrasound tomography framework.
Sign Up to like & getrecommendations! Published in 2021 at "Ultrasonics"
DOI: 10.1016/j.ultras.2021.106393
Abstract: Quantitative ultrasound (QUS) has emerged as a viable tool in diagnosing and staging the onset and progression of various diseases. Within the field of QUS, shear wave elastography (SWE) has emerged as the clinical standard… read more here.
Keywords: speed sound; probe; framework; speed ... See more keywords