Results 241 to 250 of about 183,094 (279)
Ultra-compact canvas-type acoustic metasurfaces for uniform sound field in indoor environments. [PDF]
Sci RepChoi E, Kim J, Jeon W.
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Broadband controllable acoustic focusing and asymmetric focusing by acoustic metamaterials
Smart Materials and Structures, 2021Abstract The applications of acoustic focusing and acoustic asymmetric focusing (AAF) are severely constrained by the narrow frequency bandwidth. In this paper, we report broad bandwidth acoustic focusing lens and asymmetric acoustic focusing lens consisting of monolayer and dual-layer metamaterials, respectively.
Guangxin Liao +5 more
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Single focused-beam acoustical tweezers
The Journal of the Acoustical Society of America, 2022Single beam acoustical tweezers have seen rapid development for their potential applications in vitro and in vivo in different fields such as acoustofluidics, microrobotics, precision medicine, and so on. The first single beam acoustical tweezers used a focused beam in analogy with optical tweezers [Lee et al., Appl. Phys.
Gong, Zhixiong, Baudoin, Michael
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Nonlocal Metasurface for Acoustic Focusing
Physical Review Applied, 2021Under the passive and lossless requirement, acoustic metasurfaces are mostly designed based on the general Snell's law (GSL), under which the power flow-conservation condition is locally satisfied along the whole surface. Recent investigations on metagrating show, however, that such kinds of structures have an intrinsic problem in their efficiency.
Huifang Xie, Zhilin Hou
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Acoustic focusing flow cytometry
The Journal of the Acoustical Society of America, 2012Acoustic cytometry is a new technology that replaces or partly replaces hydrodynamic focusing of cells or particles in flow cytometry with forces derived from acoustic radiation pressure. The ability to focus cells into a tight line without relying on hydrodynamic forces allows many possibilities outside the scope of conventional flow cytometry. Dilute
Gregory Kaduchak +2 more
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Focusing of microwave acoustic beams
Ultrasonics, 1967A description is given of an experimental study, using Bragg scattering, of the properties of cylindrically-focused longitudinal-wave acoustic beams in fused quartz in the frequency range 200–425 Mc/sec. The results are analyzed and shown to be in good agreement with Fresnel diffraction theory indicating, as expected, that elastic waves at ultrasonic ...
M. G. Cohen, E. I. Gordon
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Photoacoustic cell using elliptical acoustic focusing
Applied Optics, 1982A photoacoustic cell has been developed in the form of an elliptical cylinder in which essentially all the acoustic energy generated by a laser beam passing down one axis is focused onto a cylindrical acoustic transducer located along the other axis.
J M, Heritier +2 more
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Focusing PVDF transducers for acoustic microscopy
Research in Nondestructive Evaluation, 1995A focusing transducer based on a 9-µm thick PVDF foil was fabricated and tested for performance. The transducer operates in the frequency range of 20–160 MHz. For operation at 78 MHz in water, a lateral resolution of 27.5 µm and a vertical resolution of 35 µm have been observed.
S. Smolorz, W. Grill
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Nonplanar acoustic metasurface for focusing
Journal of Applied Physics, 2019Acoustic metasurfaces have attracted considerable attention in recent years because of their unprecedented manipulation of acoustic waves within subwavelength planar structures. However, planar rigid structures are not compatible with human skin, which possesses dynamically varying and highly unconventional geometries.
Hanchuan Tang +2 more
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