Results 31 to 40 of about 2,739,672 (219)
Fluctuation sound absorption in quark matter [PDF]
Mod. Phys. Lett. A, Vol. 31, No. 32 (2016) 1650179, 2016 We investigate the sound absorption in quark matter due to the interaction of the sound wave with the precritical fluctuations of the diquark-pair field above $T_c$. The soft collective mode of the pair field is derived using the time dependent Ginzburg-Landau functional with random Langevin forces.
arxiv +1 more source
, 2019 Proceedings of the ICA 2019 and EAA Euroregio : 23rd International Congress on Acoustics, integrating 4th EAA Euroregio 2019 : 9-13 September 2019, Aachen, Germany / proceedings editor: Martin Ochmann, Michael Vorländer, Janina Fels 23rd International Congress on Acoustics, integrating 4th EAA Euroregio 2019, ICA 2019, Aachen, Germany, 9 Sep 2019 - 13 ...
Li, Mengmeng +3 more
openaire +4 more sources
Sound absorption by tree bark [PDF]
Applied Acoustics, 2020 Abstract Scattering of sound waves by trunks is a main physical factor leading to sound pressure level reduction by tree belts, and it has been shown before that the absorbing properties of the trunks are relevant in this respect. However, detailed information on bark absorption is currently very scarce.
Mengmeng Li +5 more
openaire +4 more sources
Optimization design of a micro-perforated panel absorber with 8.6 octave bands [PDF]
arXiv, 2023 In order to improve low-frequency characteristics of micro-perforated panel absorbers, sound absorption structures composed of micro-perforated panels and expansion chambers are design, and an optimization design method is constructed based on the transfer function model and the simulated annealing algorithm.
arxiv
Ultra-open High-efficiency Ventilated Metamaterial Absorbers with Customized Broadband Performance [PDF]
Extreme Mechanics Letters, 39, 100786 (2020), 2019 High-efficiency absorption of low-frequency sounds (< 1000 Hz) while maintaining a free flow of fluids remains a significant challenge in acoustical engineering due to the rigid trade-off between absorption and ventilation performances. Although ongoing advances in acoustic metamaterials have unlocked unprecedented possibilities and various ...
arxiv +1 more source
Nonlinear acousto-electric transport in a two-dimensional electron system
, 2000 We study both theoretically and experimentally the nonlinear interaction between an intense surface acoustic wave and a two-dimensional electron plasma in semiconductor-piezocrystal hybrid structures.
A. L. Belostotskii +43 more
core +2 more sources
Journal of the Acoustical Society of America, 2020 This paper proposes a strategy to broaden the sound absorption region of porous materials by embedding ribs. The theoretical solution and the numerical simulations of the optimization model show that the composite metastructure exhibits ultra-wide high ...
Nansha Gao +3 more
semanticscholar +1 more source
Sound attenuation in the superconducting amorphous alloy ZrTiCuNiBe [PDF]
, 1999 The superconducting energy gap and the parameter of the intensity of electron scattering at two-level systems in amorphous ZrTiCuNiBe are determined from the results of measurements of sound attenuation.
A. L. Gaiduk +8 more
core +2 more sources
PLoS ONE, 2021 Porous materials have been widely used in the field of noise control. The non-acoustical parameters involved in the sound absorption model have an important effect on the sound absorption performance of porous materials.
Xiaomei Xu, Ping-I Lin
semanticscholar +1 more source
Sound absorption properties of aluminum sponges manufactured by infiltration process [PDF]
, 2010 In this paper, the sound absorption properties of aluminum sponges manufactured by infiltration process have been studied. The results show that the sound absorption factor α changes in function of pore size.
Cruz, Luis J. +4 more
core +2 more sources