Results 51 to 60 of about 2,509,464 (278)
Holzforschung, 2021 In this study, the sound absorption coefficient of three low density hardwoods – binuang, balsa and paulownia – were investigated. Their gas permeability and pore size were measured, and their pore shapes were classified into through pore, blind pored ...
E. Jang, C. Kang
semanticscholar +1 more source
Sound and Heat Absorption by a 2D Electron Gas in an Odd-Integer Quantized-Hall Regime [PDF]
Phys. Rev. B 61, 5461 (2000), 1999 The absorption of bulk acoustic phonons in a two-dimensional (2D) GaAs/AlGaAs heterostructure is studied (in the clean limit) where the 2D electron-gas (2DEG), being in an odd-integer quantum-Hall state, is in fact a spin dielectric. Of the two channels of phonon absorption associated with excitation of spin waves, one, which is due to the spin-orbit ...
arxiv +1 more source
Ultralight micro-perforated sandwich panel with hierarchical honeycomb core for sound absorption
Journal of Sandwich Structures and Materials, 2021 A theoretical model is developed to study the superior sound absorption performance of ultralight mirco-perforated sandwich panels with double-layer hierarchical honeycomb core.
W. He, Xiangjun Peng, F. Xin, T. Lu
semanticscholar +1 more source
Jurnal Rekayasa Kimia & Lingkungan, 2011 Panel of foam concrete wall is a type of membrane panel which has maximum sound absorption and can create quite and environmentally friendly room. The purpose of this study was to determine the magnitudeof the sound absorption value using the Sabine ...
Zulfian Zulfian +2 more
doaj +2 more sources
The effect of surface structure on the sound absorption properties of porous glass
Xi'an Gongcheng Daxue xuebao, 2021 In order to study the influence of the surface structure of full-bore porous glass on its sound absorption properties, the surface was punched twice, the influence of surface structure parameters on the sound absorption properties of full-bore porous ...
Xubo ZHANG +5 more
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Wettability and sound absorption of graphene oxide doped polymer hydrogel
Scientific Reports, 2021 In this paper, we introduce a nanocomposite as a humidity-sensitive sound absorber. The nanocomposites were prepared using hydrogel polymer (HP) as a matrix and graphene oxide (GO) as a filler. Results show that the surface energy of the nanocomposite is
A. Khosrozadeh +3 more
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Journal of Materials Research and Technology, 2023 The sandwich structure based on Triply periodic minimal surface (TPMS) is a lightweight and high-strength multifunctional composite material that combines the versatility of heat exchange, impact resistance, and energy absorption, and has been widely ...
Pengfei Zhang +8 more
doaj
Nonlinear generation of sound waves in the pre-galactic epoch and 21 cm absorption [PDF]
arXiv, 2023 The structure of the sound waves generated in baryonic gas during the evolution of dark matter halos with masses less than the Jeans mass is calculated. In this case, the source of the gravitational field that creates the wave can be either at a linear stage (an evolving perturbation in dark matter) or at a nonlinear stage (detached and virialized ...
arxiv
Applied SciencesPowders that absorb sound by longitudinal vibration have either a gentle or sharp sound absorption curve at the first absorption peak frequency. Experiments were performed to investigate the conditions under which longitudinal vibration occurs in powders
Shuichi Sakamoto +4 more
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Advances in Mechanical Engineering, 2015 Porous metal materials are widely used in noise control with high sound pressure applications such as aircraft engine liners and combustion chambers for rocket engines due to their excellent performance of sound absorption characteristics and ...
Xiaopeng Wang +3 more
doaj +1 more source