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The effect of cutting direction and water based varnish type on sound absorption coefficient in some native wood species

Maderas: Ciencia y Tecnología
Noise which could be defined as disturbing sound, is becoming a major problem depending with developing technology. Controlling the noise helps raising the quality of life to higher levels. Although the intensity of the noise is not at a level that will
Mustafa Selmani Muslu
doaj   +1 more source

A Brief Review of Specialty Optical Fibers for Brillouin-Scattering-Based Distributed Sensors

Applied Sciences, 2018
Specialty optical fibers employed in Brillouin-based distributed sensors are briefly reviewed. The optical and acoustic waveguide properties of silicate glass optical fiber first are examined with the goal of constructing a designer Brillouin gain ...
Peter Dragic, John Ballato
doaj   +1 more source

Astrophysical Accretion as an Analogue Gravity Phenomena [PDF]

, 2006
In recent years, strong analogies have been established between the physics of acoustic perturbations in an inhomogeneous dynamical fluid system, and some kinematic features of space-time in general relativity.
Das, Tapas Kumar
core   +1 more source

Acoustic black holes

, 2005
We discuss some general aspects of acoustic black holes. We begin by describing the associated formalism with which acoustic black holes are established, then we show how to model arbitrary geometries by using a de Laval nozzle.
Cardoso, Vitor
core   +1 more source

Properties of high-frequency wave power halos around active regions: an analysis of multi-height data from HMI and AIA onboard SDO

, 2012
We study properties of waves of frequencies above the photospheric acoustic cut-off of $\approx$5.3 mHz, around four active regions, through spatial maps of their power estimated using data from Helioseismic and Magnetic Imager (HMI) and Atmospheric ...
A. Fossum, A.A. Norton, B. Fleck, B.W. Hindman, B.W. Lites, C. Nutto, C.G. Toner, C.S. Rosenthal, D. Kuridze, D.C. Braun, E. Khomenko, E. Khomenko, E. Khomenko, E. Khomenko, E. Khomenko, E. Khomenko, F. Hill, G. Vigeesh, H. Schunker, H. Schunker, H. Schunker, J.H. Borrero, J.H. Thomas, J.R. Lemen, K. Hayashi, K. Libbrecht, K. Nagashima, K.D. Leka, L. Jacoutot, O.V. Ladenkov, P. Kumar, P. Kumar, P. Kumar, P.F. Moretti, P.H. Scherrer, P.S. Cally, R. Jain, R. Nigam, S. Couvidat, S. P. Rajaguru, S. Shelyag, S.M. Hanasoge, S.M. Hanasoge, S.P. Rajaguru, S.P. Rajaguru, T.J. Bogdan, T.J. Bogdan, T.M. Brown, T.R. Metcalf, T.R. Metcalf, W. Finsterle, Xudong Sun   +51 more
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Non-woven flax fibre reinforced acrylic based polyester composites: The effect of sodium silicate on mechanical, flammability and acoustic properties

eXPRESS Polymer Letters, 2019
Non-woven flax fibre reinforced acrylic-based polyester (NFA) composites were prepared using an impregnation process. A mixture of acrylic-based polyester (Acrodur®) with varying sodium silicate (SS) loadings was applied to impregnate the non-woven flax ...
M. F. Ahmad Rasyid, M. S. Salim, H. M. Akil, J. Karger-Kocsis, Z. A. Mohd. Ishak   +4 more
doaj   +1 more source

Special transformations for pentamode acoustic cloaking

, 2012
The acoustic cloaking theory of Norris (2008) permits considerable freedom in choosing the transformation function f from physical to virtual space. The standard process for defining cloak materials is to first define f and then evaluate whether the ...
Cipolla, Jeffrey L., Gokhale, Nachiket H., Norris, Andrew N.   +2 more
core   +1 more source

Acoustic Properties of Cellulose

IOP Conference Series: Materials Science and Engineering, 2017
Cellulose is the oldest material for thermal insulation in construction field. Thomas Jefferson was the first architect that used the cellulose in his project of the Monticello house (1800). But only after 1945 that the cellulose from newsprint was used across America and northern Europe.
Amelia Trematerra, Ilaria Lombardi
openaire   +1 more source

An Investigation of the Sound Absorption Properties of Flax/Epoxy Composites Compared with Glass/Epoxy Composites

Journal of Natural Fibers, 2017
Natural fiber based composites are becoming attractive candidates for use in various applications owing to their mechanical and sound absorption properties.
Heow Pueh Lee, Benson Mun Pun Ng, Abhishek Vishwanath Rammohan, Le Quan Ngoc Tran   +3 more
doaj   +1 more source

Acoustic metafluids

, 2008
Acoustic metafluids are defined as the class of fluids that allow one domain of fluid to acoustically mimic another, as exemplified by acoustic cloaks. It is shown that the most general class of acoustic metafluids are materials with anisotropic inertia ...
Norris, Andrew N.
core   +1 more source