Results 81 to 90 of about 299,182 (254)
The use of acoustics in space exploration
, 2007 In recent years increased attention has been paid to the potential uses of acoustics forextraterrestrial exploration. The extent to which acoustics per se is used in these studiesvaries greatly. First, there are the cases in which acoustics is simply the
Leighton, T.G.
core
Acoustic pressure modulation driven by spatially non-uniform flow [PDF]
The recent identification of a modulation of acoustic waves that is driven by spatial velocity gradients, using acoustic black and white hole analogues [Schenke et al., J. Acoust. Soc. Am. 154 (2023), 781-791], has shed new light on the complex interplay of acoustic waves and non-uniform flows.
arxiv +1 more source
Propagation of sound through a sheared flow [PDF]
Sound generated in a moving fluid must propagate through a shear layer in order to be measured by a fixed instrument. These propagation effects were evaluated for noise sources typically associated with single and co-flowing subsonic jets and for ...
Karamcheti, K. +2 more
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A statistical approach to sound propagation is considered in situations where, due to the presence of large gradients of properties of the medium, the classical (deterministic) treatment of wave motion is inadequate. Mathematical methods for wave motions
Kentzer, C. P.
core +1 more source
Physical Review X, 2014 We introduce here the concept of acoustic parity-time (PT) symmetry and demonstrate the extraordinary scattering characteristics of the acoustic PT medium.
Xuefeng Zhu +4 more
doaj +1 more source
Computer programs perform spectral analyses of up to seven time series [PDF]
, 1966 Computer programs perform statistical spectral analyses of up to seven time series. These programs should have applicability to a variety of engineering systems in the fields of geophysics, physiology, acoustics, and structural ...
Byars, B. J., Dubman, M. R.
core +1 more source
Riemannian geometry of irrotational vortex acoustics
, 2002 We consider acoustic propagation in an irrotational vortex, using the technical machinery of differential geometry to investigate the ``acoustic geometry'' that is probed by the sound waves.
A. Gullstrand +14 more
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A Method to Improve the Resolution of the Acoustic Microscopy [PDF]
arXiv, 2017 In this report, we demonstrate a new principle to improve the resolution of the acoustic microscopy, which is based on the sub-wavelength focusing of acoustic wave passing through an acoustically transparent mesoscale particle. In the principle, the width of the acoustic focal area can be less than one wavelength.
arxiv
Application of Iterative Maximum Weighted Likelihood Estimation in 3-D Target Localization
Applied Sciences, 2019 Time-of-flight (ToF)-based 3-D target localization is a very challenging topic because of the pseudo-targets introduced by ToF measurement errors in traditional ToF-based methods.
Jiayi Chen +3 more
doaj +1 more source
Ultrafast Magneto-Acoustics in Nickel Films
, 2011 We report about the existence of magneto-acoustic pulses propagating in a 200-nm-thick ferromagnetic nickel film excited with 120 fs laser pulses. They result from the coupling between the magnetization of the ferromagnetic film and the longitudinal ...
G. Zhang +6 more
core +1 more source