Results 31 to 40 of about 2,739,977 (397)

Sound absorption property of openpore aluminum foams [PDF]

China Foundry, 2007
This paper presents a study on sound absorption property of aluminum foam by evaluating its sound absorption coefficients using standing wave tube method. Experimental results showed that the average values of sound absorption coefficients (over the test
WANG Fang, WANG Lu-cai, WU Jian-guo
doaj  

Study for sound-absorbing materials of biomass tubule (Oblique incident sound-absorption coefficient of oblique arrangement of rice straws)

Nihon Kikai Gakkai ronbunshu, 2016
In this paper, we report the use of sound-absorbing materials, specifically sound-absorbing structures of bundled rice straws, that are oblique arranged incident to the sound waves.
Shuichi SAKAMOTO, Taisei TSURUMAKI, Kohei FUJISAWA, Koki YAMAMIYA   +3 more
doaj   +1 more source

Structural Characteristics and Sound Absorption Properties of Waste Hemp Fiber

Coatings, 2022
In order to realize high-efficiency and high-value recycling of waste hemp fibers, the macromolecular structure, the supramolecular structure, and the morphological structure of waste hemp fibers were investigated by using Fourier transform infrared ...
Duoduo Zhang, Xing-lin Zhou, Yuan Gao, Li-hua Lyu   +3 more
semanticscholar   +1 more source

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, Abdul Roni, N, Adnan1, S H, Alisibramulisi, A, Jamellodin, Z, Kamarulzaman, N A, Mohd Sari, K A, Mohd Yassin, N I, Osman, M H, Wahee Anuar, M N A   +9 more
core   +1 more source

Improved sound absorption with 3D-printed micro-perforated sandwich structures

Journal of Materials Research and Technology
The micro-perforated sandwich structure based on triply periodic minimal surfaces (TPMS) is a lightweight, high-strength and multi-functional structure, which integrates heat exchange, impact resistance, energy absorption, etc., and has been widely used ...
Peng-Fei Zhang, Zhong-Hua Li, Yu-Jun Zhou, Qi-Fei Zhang, Bin Liu, Fei Liu, Si-Chen Pei, Ke Shi, Pei-kang Bai   +8 more
doaj   +1 more source

Improved low-frequency sound absorption of porous silicone rubber resonance sheet with periodic cavities

Journal of Low Frequency Noise, Vibration and Active Control, 2022
Since the development of advanced sound absorption material is highly critical in noise control applications, anechoic coatings, and acoustic metamaterials, both fabrication technology and structure design are significant in the achievement of broadband ...
Longgui Peng, Pu Zhao, Huanquan Cheng, Qirui He, Lifei Du   +4 more
doaj   +1 more source

Sound Absorption of Curtains [PDF]

The Journal of the Acoustical Society of America, 1970
The absorption of normal incident sound by a curtain hung flat before a wall depends on the flow resistivity and the weight of the material and the distance to the wall, as has been found experimentally and could be deduced theoretically. The same theory allows one to calculate the absorption for oblique incident and, also therefore, for statistical ...
openaire   +2 more sources

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, A. L. Efros, A. O. Govorov, A. V. Chaplik, A. V. Chaplik, A. V. Kalameitsev, A. Wixforth, A. Wixforth, B. A. Auld, C. W. Skorupka, E. Yablonovich, G. R. Nash, G. Weinreich, I. L. Drichko, I. L’Heureux, J. M. Shilton, J. P. Kotthaus, J. R. A. Beale, K. A. Ingebrigtsen, K.-H. Hoffmann, L. I. Magarill, M. J. Hoskins, M. K. Balakirev, M. K. Balakirev, M. Rotter, M. Rotter, M. Rotter, M. Rotter, M. Rotter, N. Botkin, P. K. Tien, P. N. Butcher, R. C. Ho, R. L. Willett, R. M. White, S. H. Simon, V. G. Mozhaev, V. I. Fal’ko, V. I. Talyanskii, V. L. Gurevich, V. L. Gurevich, W. J. Tanski, Yu. V. Gulyaev, Yu. V. Gulyaev   +43 more
core   +2 more sources

Sound Absorption of Snow [PDF]

Nature, 1939
THE impressive and all-pervading quietness following a fall of snow is a commonplace experience, though, so far as we are aware, no measurements of the sound absorption of snow have been published. The recent cold spell provided a suitable opportunity to make such measurements in the reverberation chamber of the National Physical Laboratory.
G. W. C. Kaye, E. J. Evans
openaire   +4 more sources

Nonlocal acoustic metasurface for ultrabroadband sound absorption

Physical review B, 2021
Classical meta-absorber designs usually have a tradeoff between bandwidth, efficiency, and thickness. Here, we introduce the concept of a nonlocal acoustic metasurface absorber by using a bridge structure connecting resonating unit cells to improve the ...
Yifan Zhu, A. Merkel, Krupali Donda, Shi-Wang Fan, Liyun Cao, B. Assouar   +5 more
semanticscholar   +1 more source