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Advanced Materials & Technologies
Lattice structures with customizable acoustical and mechanical properties show significant promise as practical engineering materials. However, the geometry of traditional lattice structures simultaneously dictates both acoustical and mechanical ...
Xinwei Li +4 more
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Lattice structures with customizable acoustical and mechanical properties show significant promise as practical engineering materials. However, the geometry of traditional lattice structures simultaneously dictates both acoustical and mechanical ...
Xinwei Li +4 more
semanticscholar +1 more source
Acoustic absorption characteristics of foamed aluminum
Acta Physica Sinica (Overseas Edition), 1998The acoustic absorption characteristics of foamed aluminum and the effect of its structural parameters on the characteristics have been investigated. The results indicate that the acoustic absorption behavior of foamed aluminum has an uncertain relation with its porosity; the effect of pore size is non-monotonous, while the flow resistance, which ...
Han Fu-sheng +4 more
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Acoustical absorption in Bragg diffraction imaging
Journal of Physics D: Applied Physics, 1977The influence of absorption of the ultrasound in the water of the Bragg cell of Bragg diffraction imaging systems is studied theoretically. It is shown that the optical image formed is that of a distorted sound field which can be written in terms of the unattenuated acoustical spectrum and geometrical factors. The absorption causes a loss of resolution
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Ultra-broadband absorption by acoustic metamaterials
Applied Physics Letters, 2014We design and experimentally realize an ultra-broad band metamaterial-based acoustic absorption material. Unlike traditional acoustic absorbers, the designed device features a simple configuration unrestricted by the material type and does not require extra sound-absorbing materials, suggesting the potential to have simultaneously structural-stiffness ...
Xue Jiang +5 more
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Absorption of acoustic waves by sunspots
Solar Physics, 1992Observations of the scattering of acoustic waves by sunspots show a substantial deficit in scattered power relative to incident power. A number of calculations have attempted to model this process in terms of absorption at the magnetohydrodynamic Alfven resonance.
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Acoustic absorption in aqueous potassium phosphate
Journal of Solution Chemistry, 1980Measurements of acoustic absorption and velocity as a function of frequency and concentration in KH2PO4−K2HPO4 buffers at 4°C and pH 5-7 are reported. The dependence of the observed acoustic relaxation parameters on concentration is consistent with that to be expected from perturbation of a monomer-dimer equilibrium with an equilibrium constant [for ...
L. Madsen +3 more
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Laminate structure with improved acoustical absorption
The Journal of the Acoustical Society of America, 1986A laminate structure with improved acoustical absorption is provided which has a first and a third layer of foamed thermoplastic material and a second layer, intermediate the first and third layers, which is a material having acoustical properties different from the properties of the material of the first and third layers. A portion of the surface area
James S. Holtrop, Richard P. Maurer
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Mechanism of Acoustic Absorption in Tissue
The Journal of the Acoustical Society of America, 1952A viscous mechanism for the absorption of ultrasonic energy in tissue is considered. It is shown that the viscous forces acting between a suitably chosen distribution of suspended particles or structure elements and a suspending liquid can account for the experimentally observed linear relations between acoustic absorption coefficient and ultrasonic ...
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Acoustic Absorption in Sand and Soil
The Journal of the Acoustical Society of America, 1948The acoustic absorption properties of sand and soil with varying amounts of water, ranging from dry to saturated, have been investigated. In most of the work the frequency range was 10–30 kc, although data were obtained at as high as 150 kc. Two methods were used.
W. L. Nyborg, I. Rudnick
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Nuclear acoustic resonance absorption and dispersion
Physics Letters A, 1977Abstract A generalized form of the “Kubo susceptibility” is presented correlating NAR absorption and NAR dispersion with the sound induced perturbation Hamiltonian h ( t ).To illustrate the advantage of NAR susceptibility, we give the first quantum theoretical treatment of dipole NAR in metals whose results are in agreement with experiment.
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