Results 21 to 30 of about 314,481 (350)

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

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

Mobile phones: a trade-off between speech intelligibility and exposure to noise levels and to radio-frequency electromagnetic fields [PDF]

, 2019
When making phone calls, cellphone and smartphone users are exposed to radio-frequency (RF) electromagnetic fields (EMFs) and sound pressure simultaneously. Speech intelligibility during mobile phone calls is related to the sound pressure level of speech
Aerts, Sam, Aminzadeh, Reza, Bockstael, Annelies, Botteldooren, Dick, Declerck, Sofie, Joseph, Wout, Martens, Luc, Thielens, Arno   +7 more
core   +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

Microstructural Evolution and Mechanical Performance of Plasma‐Assisted Hybrid Friction Stir Welded Dissimilar Aluminum–Copper Joints

Advanced Engineering Materials, EarlyView.
Plasma‐assisted hybrid friction stir welding of dissimilar AlCu joints employs localized plasma preheating to balance heat input and enhance plastic flow. The optimized process reduces axial force by up to 35%, refines the microstructure, and achieves ≈96% joint efficiency.
Deepak Kumar Yaduwanshi, Pankaj Shrivastava, Ganesh Chouhan, Velaphi Msomi   +3 more
wiley   +1 more source

Study on Sound Absorption Properties of Polyvinyl Chloride (PVC) Film Multicavity Structure Materials

Shock and Vibration
Since 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, Jiyang Zhang, Pengxuan Zheng, Hong Hou, Ying Xu   +4 more
doaj   +1 more source

Absorption of Sound Wave by Fabrics

Journal of the Textile Machinery Society of Japan, 1963
目的 織物の通気抵抗を測定し, 吸音特性に及ぼす通気抵抗の影響を究明する. 成果 (1) 織物の通気抵抗Rfは流速Vの関数としてRf=Ai+BiVで表わされる.AiとBiは密度と組織によって定まる常数である.同一組織であれば, 密度が小さい織物はBδ≒0, 密度が大きくなるとAi, Biともに増加する. (2) 流速の遅い範囲でRf-Aiとみなせる織物の吸音機構は完全粘性抵抗型である. (3) 完全粘性抵抗型の織物の吸音特性と通気抵抗Rfの間にはつぎの関係が成立つf0= (c/4-aiRf) d-1;α ∞=a'iRfここにα∞;最大吸音率, f0;α ∞ を示す振動数, d;織物の背後空気層の長さ, c;音速, a'i, ai;組織によって定まる常数である.
Sadao Aso, Rikuhiro Kinoshita
openaire   +4 more sources