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Richard Ashcroft:
🎵 A Song For The Lovers
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$f(T)$ gravity after DESI Baryon Acoustic Oscillation and DES Supernovae 2024 data
Celia Escamilla-Rivera, Rodrigo Sandoval-Orozco
https://arxiv.org/abs/2405.00608

$f(T)$ gravity after DESI Baryon Acoustic Oscillation and DES Supernovae 2024 data
In this letter we investigate new constraints on $f(T)$ gravity using the recent Baryon Acoustic Oscillation (BAO) data released by the Dark Energy Spectroscopic Instrument (DESI) and the Type Ia supernovae (SNIa) catalog from the full 5-years of the Dark Energy Survey Supernova Program (DES-SN5YR). The $f(T)$ cosmological models considered are characterised by power law late-time accelerated expansion. Our results show that the combination DESI BAO +$r_d$ CMB Planck suggests a Bayesian prefere…

Physics-Informed Acoustic Liner Optimization: Balancing Drag and Noise
Haris Shahzad, Stefan Hickel, Davide Modesti
https://arxiv.org/abs/2405.00563 https:…

Physics-Informed Acoustic Liner Optimization: Balancing Drag and Noise
We present pore-resolved Direct Numerical Simulations (DNS) of turbulent flows grazing over acoustic liners with aerodynamically and/or acoustically optimized orifice configurations. Our DNS explore a large parameter space, studying various families of orifice geometries, including the influence of orifice shape, orientation, and the number of orifices. All flow cases show an increase in drag compared to the smooth wall. However, the added drag can be reduced by as much as $\sim$55\% as compare…

This https://arxiv.org/abs/2401.14292 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_csRO_…

Single and bi-layered 2-D acoustic soft tactile skin (AST2)
This paper aims to present an innovative and cost-effective design for Acoustic Soft Tactile (AST) Skin, with the primary goal of significantly enhancing the accuracy of 2-D tactile feature estimation. The existing challenge lies in achieving precise tactile feature estimation, especially concerning contact geometry characteristics, using cost-effective solutions. We hypothesise that by harnessing acoustic energy through dedicated acoustic channels in 2 layers beneath the sensing surface and an…

This https://arxiv.org/abs/2402.11919 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_csSD_…

Unraveling Complex Data Diversity in Underwater Acoustic Target Recognition through Convolution-based Mixture of Experts
Underwater acoustic target recognition is a difficult task owing to the intricate nature of underwater acoustic signals. The complex underwater environments, unpredictable transmission channels, and dynamic motion states greatly impact the real-world underwater acoustic signals, and may even obscure the intrinsic characteristics related to targets. Consequently, the data distribution of underwater acoustic signals exhibits high intra-class diversity, thereby compromising the accuracy and robust…

Vortexes as systems specific to the Acoustic World
Ion Simaciu, Viorel Drafta, Zoltan Borsos, Gheorghe Dumitrescu
https://arxiv.org/abs/2405.00052 https://…

Vortexes as systems specific to the Acoustic World
In this paper we study the properties of vortexes, as systems specific to the Acoustic World, using both hydrodynamic theory and the corresponding hydrodynamic Maxwell equations. According to this study, it follows that the vortex behaves like an acoustic dipole that has intrinsic/internal angular momentum. The system of two identical vortices also has orbital angular momentum and behaves, at distances much greater than the distance between the axes of the vortices, as a single vortex. With the…

High-resolution spatio-temporal strain imaging reveals loss mechanisms in a surface acoustic wave device
Tao Zhou, Alexandre Reinhardt, Marie Bousquet, Joel Eymery, Steven Leake, Martin V. Holt, Paul G. Evans, Tobias Sch\"ulli
https://arxiv.org/abs/2405.00054

High-resolution spatio-temporal strain imaging reveals loss mechanisms in a surface acoustic wave device
Surface acoustic wave devices are key components for processing radio frequency signals in wireless communication because these devices offer simultaneously high performance, compact size and low cost. The optimization of the device structure requires a quantitative understanding of energy conversion and loss mechanisms. Stroboscopic full-field diffraction x-ray microscopy studies of a prototypical one-port resonator device revealed the existence of unanticipated acoustic loss. A non-uniform ac…

This https://arxiv.org/abs/2306.05960 has been replaced.
initial toot: https://mastoxiv.page/@ar…

Acoustic resolvent analysis of turbulent jets
We perform a resolvent analysis of a compressible turbulent jet, where the optimisation domain of the response modes is located in the acoustic field, excluding the hydrodynamic region, in order to promote acoustically efficient modes. We examine the properties of the acoustic resolvent and assess its potential for jet-noise modelling, focusing on the subsonic regime. Resolvent forcing modes, consistent with previous studies, are found to contain supersonic waves associated with Mach wave radia…

This https://arxiv.org/abs/2312.12367 has been replaced.
initial toot: https://mastoxiv.page/@ar…

Dynamics of a millimeter size drop exposed to MHz-frequency surface acoustic wave in the underlying solid substrate
We present an experimental, theoretical, and computational study of the spreading of a millimetric silicon oil drop under the excitation of a surface acoustic wave (SAW), traveling in the underlying solid substrate. Our theoretical model, formulated within the long wave approach, dynamically captures the interplay between fluid dynamics and acoustic driving forces, emphasizing Eckart streaming as the dominant mechanism over Schlichting and Rayleigh streaming due to drop thickness. Following an …

This https://arxiv.org/abs/2308.01989 has been replaced.
initial toot: https://mastoxiv.page/@ar…

Coupling the thermal acoustic modes of a bubble to an optomechanical sensor
We report experimental observations of the volume acoustic modes of air bubbles in water, including both the fundamental Minnaert breathing mode and a family of higher-order modes extending into the megahertz frequency range. Bubbles were placed on or near optomechanical sensors having a noise floor substantially determined by ambient medium fluctuations, and which are thus able to detect thermal motions of proximate objects. Bubble motions could be coupled to the sensor through both air (i.e.,…