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Acoustic Wave - Crossref

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Last Updated: 04 December 2022

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The influence law of concrete aggregate particle size on acoustic emission wave attenuation

Abstract When propagating in various materials, elastic waves have varying attenuation standards, which is one of the primary obstacles in the development of non-destructive testing techniques, such as acoustic emission technologies in geotechnical engineering, is that they propagate in many substances. The study, which was published in this paper, investigated the effect mechanism of concrete composition materials and parameters on elastic wave propagation legislation using concrete specimens made in six different particle sizes of sand or gravel. The attenuation of elastic wave amplitude, energy spectral density, and frequency all were positively related to aggregate particle size, according to the study, although the elastic wave spectrum center of gravity generally decreased with the propagation distance. With the propagation distance, the ring count gradually decreased, and specimens with a larger aggregate particle size underwent a relatively fast ring count attenuation rate.

Source link: https://doi.org/10.1038/s41598-021-02234-x


Propagatory dynamics of nucleus-acoustic waves excited in gyrogravitating degenerate quantum plasmas electrostatically confined in curved geometry

Abstract A theoretic model is used to investigate the dynamics of the longitudinal nucleus-acoustic waves in a gyrograviting electrostatically bound degenerate quantum plasma system with spherically symmetric geometry is developed. It emphasizes the reliance of several atypical instability responses on the equilibrium plasma parameters. The relative nuclear charge-to-mass coupling parameter appears as a destabilizing department, according to a numerical illustrative platform, and the heavy-to-light nuclear charge density ratio acts as a stabilizing department in both the non-relativistic and ultra-relativistic limits. In both the limits, the Coriolis rotation introduces a destabilizing force on the system.

Source link: https://doi.org/10.1038/s41598-021-98543-2


Lateral resolution limit of laser Doppler vibrometer microscopes for the measurement of surface acoustic waves

Abstract The lateral or transverse resolution of single-point interferometers for vibration measurement is particularly important for microelectromechanical systems vibrating up to the gigahertz range. Hence, a fruitful vibration measurement needs detailed information about the lateral resolution threshold and its relationships with instrumentation parameters. We present an analytic approximation scheme in this paper, which allows for the estimation of the systematic measurement error of the vibration amplitude and, therefore, a measure of the lateral resolution limit of single-point interferometers for vibration measurement. An unidirectional surface acoustic wave is regarded as an estimation model.

Source link: https://doi.org/10.1038/s41598-021-96684-y


Fluctuation and extinction of laminar diffusion flame induced by external acoustic wave and source

Abstract Acoustic wave can destabilize the fire and has a role in firefighting, but the effects of the sound source and its frequency are also uncertain. The movement of the speaker membrane and its induced wind has been shown to be two orders of magnitude larger than the displacement of the air that transmits the acoustic wave. A crucial flame strain rate, which is increased by high airflow, can be used to characterize the blow-off limit better than the local sound pressure.

Source link: https://doi.org/10.1038/s41598-021-93648-0


3D numerical simulation of acoustophoretic motion induced by boundary-driven acoustic streaming in standing surface acoustic wave microfluidics

Abstract: Several cells and micro/nano-objects can be successfully handled by standing surface acoustic waves in microfluidic devices to manipulate various cells and micro-nano-objects. Based on the limiting velocity finite element method, a fully coupled 3D numerical simulation of boundary-driven acoustic streaming in the acoustofluidic devices using SSAWs has been conducted in Herein. A taSSAW platform for separating polystyrene beads is simulated on YX 128 ^2̆218 u2218 LiNbO 3 substrate for unraveling polystyrene beads is simulated, displaying acceptable agreement with reported experimental results. A novel sheathless taSSAW cell/particle separator is conceptualized and manufactured in subsequently, as an extension of the 3D model. Due to the more time-/cost-effective results than precedented 3D models, the ability to produce complex on-chip designs, and overcome limitations and limitations of 2D simulations, the presented 3D fully coupled model could be a useful tool in further designing and optimizing SSAW microfluidics.

Source link: https://doi.org/10.1038/s41598-021-90825-z


Extraction of apex beat waveform from acoustic pulse wave by sound sensing system using stochastic resonance

Abstract With a sound sensing device that uses stochastic resonance, it was easy to obtain an acoustic pulse wave, u2014 a waveform created by a combination of apex beat and heart sound. The change was 1/f, which indicated an efficient cardiac transfer when heart rate was 70 to 80 ppm, according to a heart rate variability report. Therefore, the latest 4SR sensing device can be used as a physical diagnostic device to obtain biological pulse wave data more often and regularly over a long time, and it does have promise for wider uses, such as AI analysis.

Source link: https://doi.org/10.1038/s41598-021-92983-6


Deep convolution stack for waveform in underwater acoustic target recognition

Abstract Deep learning techniques have been shown to be highly effective at detecting original signal waveforms in submersible acoustic target detection. The ability of nonlinear transformation facilitated by a deep network has yet to be fully utilized. Even though such frame has been used in other deep learning fields, the deep convolution stack is a type of network frame with a flexible and balanced structure, and it has not been extensively tested in underwater acoustic target recognition. The legitimacy of MSRU is established by incorporating MSRU into Generative Adversarial Networks.

Source link: https://doi.org/10.1038/s41598-021-88799-z


Large asymmetry in the magnetoresistance loops of ferromagnetic nanostrips induced by Surface Acoustic Waves

Abstract This work demonstrates that Surface Acoustic Waves can cause a significant asymmetry in an adjacent ferromagnetic nanostrip's magnetoresistance loop, making it seem as if it had exchange bias. In the ferromagnetic nanostrip, the Surface Acoustic Wave generates a DC voltage. The large asymmetry in the magnetoresistance loop described in this study is a sign of an efficient transfer of electricity from the SAW to the magnetization system, a step that has been newly implemented as a means to extract electricity from a heat source.

Source link: https://doi.org/10.1038/s41598-021-88113-x


Theoretical and experimental revision of surface acoustic waves on the (100) plane of silicon

In the whole range of the azimuthal angle of propagation, the phase velocity dispersion of the surface acoustic waves on a basal plane of Si has been estimated. In a narrow range of the phase velocities, the SAWs are absent in the entire range of the azimuthal angles, meaning that in a narrow range of the phase velocities.

Source link: https://doi.org/10.1038/s41598-021-82211-6


Surface acoustic wave nebulization improves compound selectivity of low-temperature plasma ionization for mass spectrometry

Abstract Mass spectrometry coupled to low-temperature plasma ionization allows for rapid and easy analysis of compounds from a sample's surface under ambient conditions. Although conventional sample heating can enhance analyte desorption, heating is not appropriate for thermally labile analytes' stability. We show that surface acoustic wave nebulization can significantly raise compound desorption for LTPI without heating the sample in this study using aromatic amines as model compounds.

Source link: https://doi.org/10.1038/s41598-021-82423-w

* Please keep in mind that all text is summarized by machine, we do not bear any responsibility, and you should always check original source before taking any actions

* Please keep in mind that all text is summarized by machine, we do not bear any responsibility, and you should always check original source before taking any actions