Results 311 to 320 of about 2,739,977 (397)
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Perfect low-frequency sound absorption of rough neck embedded Helmholtz resonators.
Journal of the Acoustical Society of America, 2022In this paper, an acoustic metamaterial, composed of rough neck embedded Helmholtz resonators, is proposed to achieve perfect sound absorption in the low-frequency range.
Lei Zhang, F. Xin
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Journal of Applied Physics, 2022
In this work, a hybrid acoustic material (HAM) is designed for broadband and low-frequency sound absorption based on the combination of two different materials: a porous layer (melamine foam) and a modified Helmholtz resonator with embedded necks (HRENs).
E. F. Vergara +4 more
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In this work, a hybrid acoustic material (HAM) is designed for broadband and low-frequency sound absorption based on the combination of two different materials: a porous layer (melamine foam) and a modified Helmholtz resonator with embedded necks (HRENs).
E. F. Vergara +4 more
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Journal of Physics D: Applied Physics, 2022
Broadband sound absorption has consistently been a challenge in designing underwater sound absorption structure (USAS). Most research of USASs achieve broadband sound absorption through structural optimization, which curbs the freedom of designing, and ...
Ying-ying Sun +7 more
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Broadband sound absorption has consistently been a challenge in designing underwater sound absorption structure (USAS). Most research of USASs achieve broadband sound absorption through structural optimization, which curbs the freedom of designing, and ...
Ying-ying Sun +7 more
semanticscholar +1 more source
Absorption of Sound in Insulators
Physical Review, 1961The theory of sound attenuation in structurally perfect dielectric crystals is extended and applied to recent experiments on the absorption of acoustic waves in crystalline quartz at frequencies from ${10}^{9}$ cps to 2.4\ifmmode\times\else\texttimes\fi{}${10}^{10}$ cps.
H. Ehrenreich, Truman O. Woodruff
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Ultralight Single‐Walled Carbon Nanotube Aerogels for Low‐Frequency Sound Absorption
Advanced Engineering Materials, 2022Absorbing low‐frequency sound below 1000 Hz with an ultralight material is a critical challenge. Nanofibrous sound‐absorbing materials have many interfaces for air‐borne sound loss.
Reo Yanagi +3 more
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Paramagnetic absorption of sound
Uspekhi Fizicheskih Nauk, 19611. Introduction 880 2. Resonant paramagnetic absorption of sound 881 3. Crystals containing ions of the iron group 881 4. Ions with an effective spin S' > 1/2 883 5. Effect on Ni2+ ions in an MgO crystal 885 6. Ions with effective spin S' = 1/2 886 7. Crystals containing ions of the rare earth elements 886 8.
A M Leushin +2 more
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The Journal of the Acoustical Society of America, 1973
The exact solution for first order nonlinear scattering of two plane waves of sound [J. Acoust. Soc. Amer. 29, 934 0957)] showed the scattered density to be ρs = c0−2E12+12ω1−1ω2−1(cosθ+12Λ)[sin−2(12θ)]∇2W12. The singularity at θ = 0, which occurs when the primary waves are collinear, may be removed by applying to this solution the operator {1 − exp[(|∂
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The exact solution for first order nonlinear scattering of two plane waves of sound [J. Acoust. Soc. Amer. 29, 934 0957)] showed the scattered density to be ρs = c0−2E12+12ω1−1ω2−1(cosθ+12Λ)[sin−2(12θ)]∇2W12. The singularity at θ = 0, which occurs when the primary waves are collinear, may be removed by applying to this solution the operator {1 − exp[(|∂
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Simplified Measurements of Sound Absorption
Transactions of the American Institute of Electrical Engineers, 1934A modification of the tube or reflected wave method for measuring the sound absorption coefficients of acoustic and building materials over a wide frequency range is described in this paper. Modern communication equipment is used, and a high degree of reliability is obtained.
Arthur L. Albert, Tom B. Wagner
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Effects of absorption on the scattering of sound by sound
The Journal of the Acoustical Society of America, 1989The scattering of sound by sound in a lossless fluid was discussed at an earlier meeting [Berntsen et al., J. Acoust. Soc. Am. Suppl. 1 83, S4 (1988), and Darvennes and Hamilton, J. Acoust. Soc. Am. Suppl. 1 83, S4 (1988)]. Here, the effects of absorption are included.
Mark F. Hamilton +3 more
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Ultra-broadband sound absorption of a hierarchical acoustic metamaterial at high temperatures
, 2021We develop a hierarchical acoustic metamaterial with ultra-broadband sound absorption and promising applications at high temperatures as a super sound absorber.
Zhendong Li +4 more
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