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This article discusses the first-order perturbation investigation of nonlinear responses in surface acoustic wave resonators on the LiTaO3/SiO2/Si platform, where bulk wave radiation is negligible near the main resonance but not in longitudinal waves. Both stress and dielectric flux are predicted to be generated by a nonlinear combination of linear strain and electric fields proportional to the SAW displacement and applied voltage, respectively, and they are newly introduced to the extended COM equations as excitation sources.
Source link: https://europepmc.org/article/MED/36074882
Ballistic devices that produce radial pressure waves are used for various therapeutic indications. Pressure curves were analyzed in water at various intensity levels and pulse repetition rates. From the pressure curves, the sound field parameters were calculated. Although the peak maximum pressure and the positive pulse intensity integral decrease only marginally for one unit comparing 1 Hz and 25 Hz, they diminish dramatically for the other device, comparing 1 Hz to 21 Hz, between 1 Hz and 21 Hz. Hence, all sound field parameters should be compared before moving settings from one device to another.
Source link: https://europepmc.org/article/MED/36302794
Sperm rheotaxis, or the phenomenon in which sperm cells swim against the direction of fluid flow, is one of the primary guiding factors for long-distance sperm migration within the female reproductive tract. In a 50-bcm channel with an elevated flow velocity of sufficiently motile sperm in a 225 bcm channel, we found a 28 percent higher lateral head displacement in a 225 bcm channel with a change in migration direction and a 52 percent rise in curvilinear velocity of sufficiently motile sperm in a 225 bcm channel from 40 bcm s -1 to 130 bcm s a u03 a bcm channel with increased in u03bcm rheotactact a u03 a o a bcm channel u03 a s bcm s bcm a s tactile a s bcm u03 otactactice bcm s bcm s vs u03 a bcm u03 These findings gave insight into sperm navigation in the female reproductive tract, where rheotactic sperm swims near the boundaries to prevent the flow in the female reproductive tract and land the fertilization site.
Source link: https://europepmc.org/article/MED/36300498
Surface acoustic waves have been combined with microfluidics technology to produce a SAW-based microfluidics system that uses the unique interaction between the two methods to manipulate substances efficiently in fluids on the surface of a substrate. This paper discusses a technique for producing SAWs using traditional planar ultrasonic transducers and acoustic lenses. It has been shown that particle positions can be controlled precisely on the substrate surface in any direction, allowing for high-precision particle manipulation. We also suggested the production of nonplanar SAWs by a specific style of the acoustic lens and realized directional particle transport.
Source link: https://europepmc.org/article/MED/36260963
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