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Acoustic Wave - Wiley Online Library

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Last Updated: 04 November 2022

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Microfabrication of surface acoustic wave devices with AlN thin film deposited on half‐inch quartz wafer

With the high-u2010power impulse magnetron sputtering device that was designed for microfabrication process in the localized clean environment and with half-inch wafer, first, AlN thin films were deposit by reactive sputtering in Aru2010N2 gas mixture at 400°C. IDTs of Al thin films have been assembled on the AlN thin films since then. The AlN thin films' X/u2010rite diffraction pattern shows that the AlN films have cc-u2010axis orientations. These findings reveal device characteristics responding to the IDTs' manufacturing specifications, as well as the potential of the fabricated SAW units as the fourth-u2010paralleled frequency filter and/or sensing system.

Source link: https://onlinelibrary.wiley.com/doi/10.1002/eej.23412


Nonlinear ion‐acoustic waves in magnetized plasmas in presence of energetic electrons and positively charged dust

In a three-component magnetized plasma containing a mixture of thermal and nonthermal inertialess electrons, warm inertial ions, and positively charged stationary dust particles, a theoretical investigation has been carried out for investigating various characteristics of ion-u2010acoustic solitary and shock waves. Different plasma parameters have significantly altered the ion'u2010acoustic solitary and shock waves, according to the paper.

Source link: https://onlinelibrary.wiley.com/doi/10.1002/ctpp.202200116


A Nonlinear Numerical Model for Comparative Study of Acoustic‐Gravity Wave Propagation in Planetary Atmospheres: Application to Earth and Mars

On several planets, a two-dimensional nonlinear numerical model has been created to investigate atmospheric coupling due to vertically propagating acoustic gravity waves. Using the Lax/u2010Wendroff technique, hyperbolic inviscid advection equations can be solved. Using a linear algebra u2010based Direct method, the parabolic diffusion terms are implicitly solved implicitly. A pressure pulse has also been demonstrated by an acous wave generation in the Martian atmosphere due to a pressure pulse. For the 2004 Sumatra earthquake, a case study of tsunami-generated AGWs is presented in this case. The results of computer-simulated AGWs closely match those obtained from ionospheric sounding studies published in literature. Gravity waves from topographic sources are shown to produce cold pockets with temperatures below the CO2 condensation threshold in another application for Martian ice cloud formation. The simulation cold pockets match the cloud echo measurements from Mars Orbiting Laser Altimeter aboard Mars Global Survey spacecraft's cloud echo experiments.

Source link: https://onlinelibrary.wiley.com/doi/10.1029/2021JE007156


Numerical Modeling of Tsunami‐Generated Acoustic‐Gravity Waves in Mesopause Airglow

To incite atmospheric waves at the surface level of a three-u2010 nonlinear and compressible neutral atmospheric model, Simulated tsunamis based on realistic bathymetry are used to incite atmospheric waves. Under nighttime assumptions, the model incorporates the chemistry and chemistry of hydroxyl OH MA. For the cases shown, MA observations have the potential to augment early-warning efforts by providing evidence on temporal and temporal evolution of tsunami waves of u223 cm and higher. They may be used in tsunami monitoring over large open ocean areas, as well as the study or reconstruction of tsunami source characteristics.

Source link: https://onlinelibrary.wiley.com/doi/10.1029/2022JA030301


Effects of non‐thermality and plasma parameters on dust‐ion‐acoustic shock waves

The nonlinear behavior of dustu2010fluctuating dust, inertial ions, and non-u2010Maxwellian electrons in a plasma consisting of chargeu2010fluctuating dust, non-u2010Maxwellian electrons is investigated. In particular, the electron velocity distribution function is expected to correspond to Kappa and Cairns' distributions. In addition, as the ion-to-electronic density ratio rises, the shock profile gets more pronounced. In the case of Kappa and Cairns U2010 distributed electrons, respectively, the determinant potential amplitude and the shock width are also shown to be closely related to the spectral indices, namely u03ba and u03b1.

Source link: https://onlinelibrary.wiley.com/doi/10.1002/ctpp.202200028


Acoustic Wave Velocities of Ferrous‐Bearing MgSiO3 Glass up to 158 GPa With Implications for Dense Silicate Melts at the Base of the Earth's Mantle

By Brillouin scattering spectroscopy, we obtained in situ high-u2010wave velocity measurements of MgSiO3 glass up to 158 GPa to determine the effect of iron on the elasticity and structural evolution of silicate melts in the lower mantle. The VS drops by u223c5. 5% in MgSiO3 glass, according to Our results. Iron influences the buoyancy-initiation interactions between melts/crystals and melts at the lowermost mantle's lowest coordination number than 6.

Source link: https://onlinelibrary.wiley.com/doi/10.1029/2022GL098279

* 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