Results 51 to 60 of about 60,794 (221)

Exploiting Geometric Frustration in Coupled von Mises Trusses to Program Multifunctional Mechanical Metamaterials

Advanced Engineering Materials, EarlyView.
Mechanical metamaterials capable of compressive stiffness tunability, shape morphing, and post‐fabrication modularity. Herein, the 3D unit cell design is based on an assembly of bistable von Mises trusses that exhibit a switch in compressive stiffness and resting height from one stable state to the other.
Yannis Liétard, Daniel Therriault, David Melancon   +2 more
wiley   +1 more source

Acoustic Absorption and Dynamic Viscosity in Polymers [PDF]

The Journal of the Acoustical Society of America, 1966
We have obtained results that show that acoustic absorption in linear polysiloxanes varies with viscosity and frequency in a unique manner. At any constant temperature, a significant relaxation is found, with a broad spectrum of relaxation frequencies.
Joseph L. Hunter, Henry D. Dardy, P. R. Derdul   +2 more
openaire   +2 more sources

The acoustical absorption by air-saturated aerogel powders

The Journal of the Acoustical Society of America, 2022
The acoustical behavior of air-saturated aerogel powders in the audible frequency range is not well understood. It is not clear, for example, which physical processes control the acoustic absorption and/or attenuation in a very light, loose granular mix in which the grain diameter is on the order of a micron.
Begum, H., Xue, Y., Bolton, J.S., Horoshenkov, K.V.   +3 more
openaire   +2 more sources

Advances in Hybrid Icing and Frosting Protection Strategies for Optics, Lens, and Photonics in Cold Environments Using Thin‐Film Acoustic Waves

Advanced Engineering Materials, EarlyView.
This article provides a comprehensive overview of fundamentals and recent advances of transparent thin‐film surface acoustic wave technologies on glass substrates for monitoring and prevention/elimination of fog, ice, and frost. Fogging, icing, or frosting on optical lenses, optics/photonics, windshields, vehicle/airplane windows, and solar panel ...
Hui Ling Ong, Zhangbin Ji, Luke Haworth, Yihao Guo, Jaime del Moral, Stefan Jacob, Ana Borras, Agustin R. Gonzalez‐Elipe, Jikai Zhang, Jian Zhou, Glen McHale, Yong‐Qing Fu   +11 more
wiley   +1 more source

The Application of Nanofibrous Resonant Membranes for Room Acoustics

Nanomaterials, 2023
Solitary sound absorbing elements exist; however, their construction is massive and heavy, which largely limits their use. These elements are generally made of porous materials that serve to reduce the amplitude of the reflected sound waves.
Klara Kalinova
doaj   +1 more source

Acoustic contributions of a sound absorbing blanket placed in a double panel structure: Absorption Versus Transmission [PDF]

The Journal of the Acoustical Society of America 128, 2 (2010) 8, 2010
The objective of this paper is to propose a simple tool to estimate the absorption vs. transmission loss contributions of a multilayered blanket unbounded in a double panel structure and thus guide its optimization. The normal incidence airborne sound transmission loss of the double panel structure, without structure-borne connections, is written in ...
arxiv   +1 more source

Elastic‐Wave Propagation in Chiral Metamaterials: A Couple‐Stress Theory Perspective

Advanced Engineering Materials, EarlyView.
The intrinsic chirality of chiral metamaterials renders an effective medium based on the classical continuum theory ineffective for predicting their acoustic activity. This limitation is addressed in the present study by employing augmented asymptotic homogenization to derive a couple‐stress‐based effective medium, enabling accurate predictions in the ...
Shahin Eskandari, Wanmin Xu, Slight Chen, Bilen Emek Abali, Valérie Orsat, Abdolhamid Akbarzadeh   +5 more
wiley   +1 more source

Study of noise absorption characteristics for current building materials applied in industrial and office rooms

Muhandisī-i bihdāsht-i ḥirfah/ī, 2016
Introduction: In Iran country, there is a lack of reliable data on acoustic characteristics of building materials applied in the offices and industrial rooms.
Mohsen Aliabadi, Rostam Golmohammadi, Mohammad Oliae, Reza Shahidi   +3 more
doaj  

Between Science and Art: Thin Sound Absorbers Inspired by Slavic Ornaments

Frontiers in Materials, 2019
Acoustic metamaterials have opened fascinating opportunities for manipulation of low-frequency sound and development of compact structures with broadband acoustic performance for noise mitigation applications, room and architectural acoustics.
Anastasiia O. Krushynska
doaj   +1 more source

Proposal of a Simplified Tool for Early Acoustics Design Stage of Classrooms in Compliance with Speech Intelligibility Thresholds

Energies, 2023
The speech intelligibility properties of classrooms greatly influence the learning process of students. Proper acoustics can promote the inclusion of foreign students and children with learning or hearing impairments.
Paolo Croce, Francesco Leccese, Giacomo Salvadori, Umberto Berardi   +3 more
doaj   +1 more source