Results 11 to 20 of about 39,171 (345)
Low-Frequency Broadband Acoustic Metasurface Absorbing Panels
Frontiers in Mechanical Engineering, 2020 A broadband sound absorption attained by a deep-subwavelength structure is of great interest to the noise control community especially for extremely low frequencies (20–100 Hz) in room acoustics.
Jun Ji +4 more
doaj +1 more source
Acoustic coherent perfect absorption based on a PT symmetric coupled Mie resonator system
APL Materials, 2023 Parity-time (PT) symmetric coupled resonator systems have exhibited intriguing and unexpected properties in optics and electronics. Here, we extend it to acoustics and report a coupled Mie resonators (MRs) system respecting PT symmetry.
Fangfang Ju +4 more
doaj +1 more source
Photoacoustic Imaging in Biomedicine and Life Sciences
Life, 2022 Photo-acoustic imaging, also known as opto-acoustic imaging, has become a widely popular modality for biomedical applications. This hybrid technique possesses the advantages of high optical contrast and high ultrasonic resolution.
Alexey Neprokin +4 more
doaj +1 more source
Study and Improvement of Acoustic Conditions in Public Spaces of Shopping Malls
Acoustics, 2021 Acoustic comfort in shopping malls is one of the aspects that influence the shopping environment. Making enjoyable and comfortable retail and public spaces is demanded when designing and managing properties.
Nikolay Kanev
doaj +1 more source
Synthesis, characterisation and evaluation on the performance of ferrofluid for microplastic removal from synthetic and actual wastewater [PDF]
, 2021 Synthesis of ferrofluid without the addition of stabilizing agents or surfactants is an innovation of new method for microplastic removal. This study focuses on the ability of several types of oils as carriers and how they may improve the removal ...
Abd. Rahman Azmi, Alyza Azzura +6 more
core +1 more source
Perfect Absorption in Mirror-Symmetric Acoustic Metascreens [PDF]
Physical Review Applied, 2020 Mirror-symmetric acoustic metascreens producing perfect absorption independently of the incidence side are theoretically and experimentally reported in this work. The mirror-symmetric resonant building blocks of the metascreen support symmetric and antisymmetric resonances that can be tuned to be at the same frequency (degenerate resonances).
V. Romero-García +7 more
openaire +5 more sources
A Rough Estimation of Acoustics of the Cuboidal Room with Impedance Walls
Archives of Acoustics, 2018 The cuboidal room acoustics field is modelled with the Fourier method. A combination of uniform, impedance boundary conditions imposed on walls is assumed, and they are expressed by absorption coefficient values.
Anna KOCAN-KRAWCZYK, Adam BRAŃSKI
doaj +1 more source
Acoustic absorption by sunspots
The Astrophysical Journal, 1987 The paper presents the initial results of a series of observations designed to probe the nature of sunspots by detecting their influence on high-degree p-mode oscillations in the surrounding photosphere. The analysis decomposes the observed oscillations into radially propagating waves described by Hankel functions in a cylindrical coordinate system ...
Barry J. Labonte +2 more
openaire +2 more sources
Nonlinear acoustic and microwave absorption in glasses [PDF]
Physical Review B, 1997 A theory of weakly-nonlinear low-temperature relaxational absorption of acoustic and electromagnetic waves in dielectric and metallic glasses is developed. Basing upon the model of two-level tunneling systems we show that the nonlinear contribution to the absorption can be anomalously large.
Martin Kirkengen, Yu. M. Galperin
openaire +3 more sources
Shape-dependence of transmission, reflection and absorption eigenvalue densities in disordered waveguides with dissipation [PDF]
, 2015 The universal bimodal distribution of transmission eigenvalues in lossless diffusive systems un- derpins such celebrated phenomena as universal conductance fluctuations, quantum shot noise in condensed matter physics and enhanced transmission in optics ...
Cao, H. +3 more
core +3 more sources