Results 31 to 40 of about 1,550,252 (358)
Nonlinear acoustic and microwave absorption in glasses [PDF]
Physical Review B, 1997 A theory of weakly-nonlinear low-temperature relaxational absorption of acoustic and electromagnetic waves in dielectric and metallic glasses is developed. Basing upon the model of two-level tunneling systems we show that the nonlinear contribution to the absorption can be anomalously large.
Martin Kirkengen, Yu. M. Galperin
openaire +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
An Analysis of Prayer Room Acoustics in the Pusdai Mosque in West Java
IOCBD 2023, 2023 : Aside from being a place for congregational prayers, the West Java Pusdai Mosque is also a center for preaching and other Islamic activities in West Java.
Fadilatun Nur Latifah +5 more
semanticscholar +1 more source
Predicting and auralizing acoustics in classrooms [PDF]
, 2005 Although classrooms have fairly simple geometries, this type of room is known to cause problems when trying to predict their acoustics using room acoustics computer modeling.
Christensen, Claus Lynge
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Process system engineering in biodiesel production: a review [PDF]
, 2013 Biodiesel is fast becoming a popular alternative to fossil fuels, as it is natural, renewable and has low toxic emissions. Strategies that have been adopted to ensure continued growth of the biodiesel industry are policy development, reduction of ...
Kamarudin, S.K. +3 more
core +2 more sources
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
Sound absorption of acoustic resonators with oblique perforations [PDF]
Applied Physics Letters, 2020 Low-frequency airborne noise reduction is an issue of major concern in most practical cases due to the limiting space constraints. The applicability of acoustic resonators that not only work in this frequency range but can also be tuned is of great interest in many noise control applications such as muffler devices, noise barriers, or building ...
J. Carbajo +3 more
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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
Absorption of surface acoustic waves by graphene [PDF]
AIP Advances, 2011 We present a theoretical study on interactions of electrons in graphene with surface acoustic waves (SAWs). We find that owing to momentum and energy conservation laws, the electronic transition accompanied by the SAW absorption cannot be achieved via inter-band transition channels in graphene. For graphene, strong absorption of SAWs can be observed in
W. Xu, S. H. Zhang
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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