Results 31 to 40 of about 39,171 (345)
Broadband low-frequency sound absorption in open tunnels with deep sub-wavelength Mie resonators
Frontiers in Physics, 2022 We report both experimentally and numerically that near-perfect absorption of low-frequency sound is realized in an open tunnel embedded with two deep sub-wavelength (0.085 λ) Mie resonators. The resonators are composed of a multiple-cavity structure and
Jianping Xia +14 more
doaj +1 more source
Nanoporous PMMA: A novel system with different acoustic properties [PDF]
, 2016 The acoustic properties of closed cell nanoporous and microporous poly(methyl methacrylate) (PMMA) foams have been well characterized, showing that nanoporous PMMA exhibit a different absorption coefficient and transmission loss behavior in comparison ...
Ballesteros Agudo, Alberto +3 more
core +1 more source
Acoustic absorption of hemp-lime construction [PDF]
Construction and Building Materials, 2016 Abstract Hemp-lime concrete is a sustainable alternative to standard wall construction materials. It boasts excellent hygrothermal properties in part deriving from its porous structure. This paper investigates the acoustic properties of hemp-lime concrete, using binders developed from hydrated lime and pozzolans as well as hydraulic and cementicious ...
Kinnane, Oliver +4 more
openaire +4 more sources
Frontiers in Physics, 2022 We report the numerical and experimental realization of a type of ultrathin planar wall with low-frequency dual-band sound absorption. The proposed planar wall is constructed by a periodic subwavelength unit cell (with a thickness of λ/19) which consists
Yu-wei Xu +10 more
doaj +1 more source
Cellulose-based Material for Sound Absorption And Its Application – A Short Review [PDF]
BIO Web of Conferences, 2023 Cellulose is a natural fiber potentially used as a sound absorber material due to its excellent properties, biodegradability, and lower environmental impact than synthetic materials and can be sourced from various plant-based materials, such as wood ...
Muchlisinalahuddin +3 more
doaj +1 more source
From a profiled diffuser to an optimized absorber [PDF]
, 2000 The quadratic residue diffuser was originally designed for enhanced scattering. Subsequently, however, it has been found that these diffusers can also be designed to produce exceptional absorption.
Cox, TJ, Lam, YW, Wu, T
core +1 more source
Bilayer ventilated labyrinthine metasurfaces with high sound absorption and tunable bandwidth
Scientific Reports, 2021 The recent advent of acoustic metamaterials offers unprecedented opportunities for sound controlling in various occasions, whereas it remains a challenge to attain broadband high sound absorption and free air flow simultaneously.
Jiayuan Du +5 more
doaj +1 more source
Influence of the Plaster Physical Structure on Indoor Acoustics
Archives of Acoustics, 2021 The article presents the main results of research on plaster samples with different physical parameters of their structure. The basic physical parameter taken into account in the research is plaster aeration.
Edyta PRĘDKA +2 more
doaj +1 more source
Acoustic absorption of solid foams with thin membranes [PDF]
Applied Physics Letters, 2018 We measured the acoustic absorption, in the 0.5–6 kHz frequency range, of polyurethane foams with mean pore diameters between 0.6 and 3.2 mm. Two types of foams were investigated: classical open-cell ones versus membrane foams, in which thin polyurethane membranes were preserved during solidification.
Gaulon, Camille +8 more
openaire +2 more sources
Acoustical properties of double porosity granular materials [PDF]
, 2011 Granular materials have been conventionally used for acoustic treatment due to their sound absorptive and sound insulating properties. An emerging field is the study of the acoustical properties of multiscale porous materials.
Umnova, O, Venegas, R
core +1 more source