Results 41 to 50 of about 2,768,062 (267)
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
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
Sound absorption of lightweight brick containing expanded polystyrene beads and palm oil fuel ash [PDF]
, 2020 Bricks are considered as important and strongest materials being used over the years. Commonly, bricks are made of clay mineral and usually used in construction of building wall. The purpose of this study is to assess the effectiveness of palm oil fuel
Abdul Hamid, N A +9 more
core +1 more source
Shock and VibrationSince the development of industry, sound absorption and noise reduction have gradually become an urgent problem to be solved. Lightweight polymer film materials are very effective in response to sound waves, and sound waves can easily cause vibration of ...
Tingying Zhang +4 more
doaj +1 more source
Akytojo betono garso absorbcijos tyrimai/Porous concrete sound absorption investigation
Journal of Civil Engineering and Management, 1996 Low-density porous concrete can be used as a sound absorbing material. This paper generalizes porous concrete sound absorption investigations. Porous concrete relative wave resistance modulus is longer than air wave resistance W=1 and that is why this
Antanas Laukaitis, Vytautas Lasauskas
doaj +1 more source
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
Zhongguo Jianchuan Yanjiu, 2023 ObjectiveThis paper aims to study the characteristics and calculation method of the vibration and sound radiation of single ring-stiffened cylindrical shells with porous fiber composite materials installed in the inner wall under acoustic excitation ...
Xinmei YANG +3 more
doaj +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
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