Results 51 to 60 of about 183,094 (279)
Horn-like space-coiling metamaterials toward simultaneous phase and amplitude modulation [PDF]
, 2018 Acoustic metasurfaces represent a family of planar wavefront-shaping devices garnering increasing attention due to their capacity for novel acoustic wave manipulation.
Anderson, Stephan +4 more
core +2 more sources
Characterization of focused-ultrasound-induced acoustic streaming [PDF]
Experimental Thermal and Fluid Science, 2019 This study is interested in one of the hydrodynamic mechanisms induced by High Intensity Focused Ultrasound (HIFU) propagation in a liquid medium, the acoustic streaming phenomenon. The latter is a flow generation caused by acoustic energy viscous dissipation during acoustic wave propagation in a fluid medium. Particle Image Velocimetry (PIV) technique
Ben Haj Slama, Rafika +3 more
openaire +2 more sources
Biosensors, 2022 This paper aims to propose a new photoacoustic/ultrasound endoscopic imaging reconstruction algorithm based on the approximate Gaussian acoustic field which significantly improves the resolution and signal-to-noise ratio (SNR) of the out-of-focus region.
Yongjun Wang +4 more
doaj +1 more source
Focusing Ultrasound with an Acoustic Metamaterial Network [PDF]
Physical Review Letters, 2009 We present the first experimental demonstration of focusing ultrasound waves through a flat acoustic metamaterial lens composed of a planar network of subwavelength Helmholtz resonators. We observed a tight focus of half-wavelength in width at 60.5 kHz by imaging a point source.
Shu, Zhang, Leilei, Yin, Nicholas, Fang
openaire +2 more sources
Two-dimensional patterning of mesoscale fibers using acoustophoresis
Materials & Design, 2023 The performance of functional composites can rely critically on the arrangement of secondary phases; for example, patterned networks of conductive particles can impart anisotropic thermal, electric or ionic conductivity while preserving flexibility in ...
Keith E. Johnson +5 more
doaj +1 more source
Cavitation pressure in liquid helium [PDF]
, 2001 Recent experiments have suggested that, at low enough temperature, the homogeneous nucleation of bubbles occurs in liquid helium near the calculated spinodal limit. This was done in pure superfluid helium 4 and in pure normal liquid helium 3. However, in
B. M. Abraham +31 more
core +3 more sources
Simultaneously focusing electromagnetic and acoustic waves by double-physical-fields null medium
Frontiers in Materials, 2023 A novel double-physical-fields lens that can simultaneously focus acoustic and electromagnetic waves into a given region is designed based on double-physical-fields null medium, which can be realized by metal plates with subwavelength separations ...
Boyang Wu +10 more
doaj +1 more source
Sub-wavelength focusing of acoustic waves in bubbly media
, 2017 The purpose of this paper is to investigate acoustic wave scattering by a large number of bubbles in a liquid at frequencies near the Minnaert resonance frequency.
Ammari, Habib +4 more
core +4 more sources
Binary acoustic metasurfaces for dynamic focusing of transcranial ultrasound
Frontiers in Neuroscience, 2022 Transcranial focused ultrasound (tFUS) is a promising technique for non-invasive and spatially targeted neuromodulation and treatment of brain diseases.
Zhongtao Hu +5 more
doaj +1 more source
Shock wave focusing using geometrical shock dynamics [PDF]
, 1997 A finite-difference numerical method for geometrical shock dynamics has been developed based on the analogy between the nonlinear ray equations and the supersonic potential equation.
Cates, J. E., Sturtevant, B.
core +1 more source