Results 21 to 30 of about 1,827,815 (335)
Perfect Absorption in Mirror-Symmetric Acoustic Metascreens [PDF]
Physical Review Applied, 2020 Mirror-symmetric acoustic metascreens producing perfect absorption independently of the incidence side are theoretically and experimentally reported in this work. The mirror-symmetric resonant building blocks of the metascreen support symmetric and antisymmetric resonances that can be tuned to be at the same frequency (degenerate resonances).
V. Romero-García +7 more
openaire +4 more sources
FROM SEA TO SURGERIES, FROM BABBLING BROOKS TO BABY SCANS: BUBBLE ACOUSTICS AT ISVR
Spring Conference Acoustics 2004, 2023 Ultrasound is passed through liquids and tissue both for diagnostic reasons, and in order to produce a material change. The most familiar diagnostic application is the external foetal scanning that is routine in many pregnancies.
TG Leighton
semanticscholar +1 more source
A Rough Estimation of Acoustics of the Cuboidal Room with Impedance Walls
Archives of Acoustics, 2018 The cuboidal room acoustics field is modelled with the Fourier method. A combination of uniform, impedance boundary conditions imposed on walls is assumed, and they are expressed by absorption coefficient values.
Anna KOCAN-KRAWCZYK, Adam BRAŃSKI
doaj +1 more source
Study and Improvement of Acoustic Conditions in Public Spaces of Shopping Malls
Acoustics, 2021 Acoustic comfort in shopping malls is one of the aspects that influence the shopping environment. Making enjoyable and comfortable retail and public spaces is demanded when designing and managing properties.
Nikolay Kanev
doaj +1 more source
Analogy electromagnetism-acoustics: Validation and application to local impedance active control for sound absorption [PDF]
, 1998 An analogy between electromagnetism and acoustics is presented in 2D. The propagation of sound in presence of absorbing material is modeled using an open boundary microwave package.
Furstoss, M. +2 more
core +3 more sources
Shape-dependence of transmission, reflection and absorption eigenvalue densities in disordered waveguides with dissipation [PDF]
, 2015 The universal bimodal distribution of transmission eigenvalues in lossless diffusive systems un- derpins such celebrated phenomena as universal conductance fluctuations, quantum shot noise in condensed matter physics and enhanced transmission in optics ...
Cao, H. +3 more
core +3 more sources
Issues for computer modelling of room acoustics in non-concert hall settings [PDF]
, 2005 The basic principle of common room acoustics computer models is the energy-based geometrical room acoustics theory. The energy-based calculation relies on the averaging effect provided when there are many reflections from many different directions, which
C. I. Chessell +3 more
core +3 more sources
Acoustic absorption by sunspots
The Astrophysical Journal, 1987 The paper presents the initial results of a series of observations designed to probe the nature of sunspots by detecting their influence on high-degree p-mode oscillations in the surrounding photosphere. The analysis decomposes the observed oscillations into radially propagating waves described by Hankel functions in a cylindrical coordinate system ...
D. C. Braun +2 more
openaire +1 more source
Angle-Dependent Absorption of Sound on Porous Materials
Acoustics, 2020 Sound-absorbing materials are usually measured in a reverberation chamber (diffuse field condition) or in an impedance tube (normal sound incidence). In this paper, we show how angle-dependent absorption coefficients could be measured in a factory-type ...
Jose Cucharero +2 more
doaj +1 more source
Active diffusers : some prototypes and 2D measurements [PDF]
, 2005 Diffusing devices are used to improve room acoustics in a wide variety of applications. The dispersion generated by current diffuser technologies is often limited to mid-to-high frequencies because low-frequency diffusers are usually too large to be ...
Avis, MR, Cox, TJ, Xiao, L
core +2 more sources