Results 261 to 270 of about 40,603 (292)
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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 in a quadrupole acoustic channel
Journal of Aerosol Science, 2009Abstract We investigate analytically and numerically focusing of aerosol micron-and-submicron size particles in the incompressible laminar flow in a three-dimensional quadrupole acoustic channel of hyperbolic cross-section. The fluid–particle interaction of micron-size non-diffusive particles is described by a linear drag force. Considering motion of
P. Vainshtein, M. Shapiro
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Focusing of acoustic energy at the conical point in zinc
Physical Review Letters, 1993This paper reports observations of the intense focusing of acoustic energy that occurs along the symmetry axis in a zinc single crystal. The focusing is associated with a conical point in the wave surface and thereby the phenomenon of external conical refraction.
, Kim, , Sachse, , Every
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Multiple field acoustic focuser
The Journal of the Acoustical Society of America, 1984The invention provides a highly focussed ultrasonic wave throughout a large depth of field without any mechanical motion. One embodiment of the invention providing two focussed fields includes a front to back arrangement of a converging lens, a transducer without any backing material to dissipate ultrasound, a converging lens, and a transducer.
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Time Reversal Acoustic Focusing With A Catheter Balloon
Ultrasound in Medicine & Biology, 2010The ability to deliver configurable myocardial lesions was noted as a critical factor to the success of atrial fibrillation (AF) treatment. This article considers the implementation of time reversal acoustics (TRA) principles for ultrasound focusing using an AF cardiac catheter developed for pulmonary vein isolation. Experiments conducted with a single
Yegor D, Sinelnikov +3 more
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Alternate focusing fluids for passive acoustic targets
The Journal of the Acoustical Society of America, 1990Fluid-filled, focusing spheres are often used as passive acoustic targets because of their relatively high target strength and aspect-independent characteristics. A fluid mixture consisting of equal parts by weight of trichlorotrifluoroethane and carbon tetrachloride provides a near-optimum index of refraction.
H, Boehme, J E, Stockton
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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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Ear-focused acoustic reflector
The Journal of the Acoustical Society of America, 1991An acoustic device for mechanically reflecting sound waves into the ear in an undistorted and directionally selective manner has a pair of movable acoustic reflectors constructed, configured and mounted to preserve accurately phase, frequency and image information in the sound waves of interest to the front of the user, secured to a headband or helmet ...
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Acoustic Focusing with Spherical Structures
The Journal of the Acoustical Society of America, 1963A variety of structures in the form of spheres can provide sharp focusing and directivity gains comparable to those from a circular piston with the same diameter. With an isotropic refractive sphere, spherical aberration does not impair focusing except for angular resolutions of the order of a few degrees and less.
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Nonlinear acoustic propagation and focusing
Radiophysics and Quantum Electronics, 1993Two model equations of nonlinear acoustics are considered. The implications of a point transformation between forms of the generalised Burgers equation (GBE) is discussed. New exact and asymptotic solutions are obtained. The dissipative Zabolotskaya-Khokhlov (DZK) equation describing acoustic wave propagation with allowance for transverse amplitude ...
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