Results 271 to 280 of about 5,467,977 (315)
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Acoustic mirror materials for acoustic devices
The Journal of the Acoustical Society of America, 2004A reflector stack or acoustic mirror arrangement for an acoustic device is described which may attain the highest possible impedance mismatch between alternating higher and lower impedance reflecting layers of the stack, so as to maximize bandwidth.
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Acoustics and dynamic materials
Mechanics Research Communications, 2020Abstract The governing equations for small-amplitude acoustic disturbances are derived by combining an admissible background flow or medium, balance laws, an equation of state and perturbation theory. This standard approach is used here when the background medium can vary in both space and time, thus defining a dynamic material.
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The Journal of the Acoustical Society of America, 1986
An acoustical absorbing material including a plurality of porous sheets and a plurality of high density sheets alternately superposed one over another and held together with contact with one another. At least one of the high density sheets is formed therein with one or more through-holes.
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An acoustical absorbing material including a plurality of porous sheets and a plurality of high density sheets alternately superposed one over another and held together with contact with one another. At least one of the high density sheets is formed therein with one or more through-holes.
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Sustainability of acoustic materials and acoustic characterization of sustainable materials
2005In the current western society, sustainable development becomes an increasingly significant goal in the evaluation and promotion of constructions. This paper briefly recalls the main methods for construction sustainability evaluation and the environmental impacts associated with various types of building techniques.
Desarnaulds V. +3 more
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2017
The use of straw bales in construction is not as old as one may suppose. The first straw bale houses date back to the invention of the baling machine at the end of the 19th century and were built in Nebraska. After a long period of abandon, this construction technique was rediscovered in the 70s and since then it has significantly evolved, gaining ...
D'Alessandro F, Schiavoni S, Bianchi, F
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The use of straw bales in construction is not as old as one may suppose. The first straw bale houses date back to the invention of the baling machine at the end of the 19th century and were built in Nebraska. After a long period of abandon, this construction technique was rediscovered in the 70s and since then it has significantly evolved, gaining ...
D'Alessandro F, Schiavoni S, Bianchi, F
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2002
Abstract : The technical objectives of this research are to determine the physical properties of new materials with emphasis on thin films deposited on substrates. For the most part, experiments will involve the measurement of elastic constants and damping.
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Abstract : The technical objectives of this research are to determine the physical properties of new materials with emphasis on thin films deposited on substrates. For the most part, experiments will involve the measurement of elastic constants and damping.
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24th International Conference on Sound and Vibration 2017, London Calling
The use of straw bales in construction is not as old as one may suppose. The first straw bale houses date back to the invention of the baling machine at the end of the 19th century and were built in Nebraska. After a long period of abandon, this construction technique was rediscovered in the 70s and since then it has significantly evolved, gaining ...
D'ALESSANDRO, FRANCESCO +2 more
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The use of straw bales in construction is not as old as one may suppose. The first straw bale houses date back to the invention of the baling machine at the end of the 19th century and were built in Nebraska. After a long period of abandon, this construction technique was rediscovered in the 70s and since then it has significantly evolved, gaining ...
D'ALESSANDRO, FRANCESCO +2 more
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Acoustic attenuation materials
The Journal of the Acoustical Society of America, 2008Acoustic attenuation materials are described that comprise outer layers of a stiff material sandwiching a relatively soft elastic material therebetween, with means such as spheres, discs or wire mesh being provided within the elastic material for generating local mechanical resonances that function to absorb sound energy at tunable wavelengths.
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Acoustic Gap Waves in Piezoelectromagnetic Materials
Mathematics and Mechanics of Solids, 2006It is shown that the propagation of a gap wave is possible between two ceramic piezoelectric half spaces as governed by the three-dimensional equations of piezoelectromagnetism with full electromagnetic coupling.
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