In this article, the two-dimensional distributions of cells from the cross section of some flexible polyurethane foams were cleared, and the three-dimensional distributions of cells based on Saltykov's theory were estimated further. As a result, it was found that a mean of the two-dimensional distri
Sound absorption characteristics of polymer microparticles
β Scribed by Hong Zhou; Bo Li; Guangsu Huang
- Publisher
- John Wiley and Sons
- Year
- 2006
- Tongue
- English
- Weight
- 339 KB
- Volume
- 101
- Category
- Article
- ISSN
- 0021-8995
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Interpenetrating polymer networks (IPNs) composed of polyurethanes and epoxies were prepared by the simultaneous technique. Modifications of the polymer structures resulted in a series of IPNs exhibiting semimiscible behavior, as evidenced by broad glass transitions in the dynamic mechanical spectra
The numerical solution of the interior surface Helmholtz integral equation for toroidal pipes is presented. Acoustic surface pressures of various pipes in the shape of a quarter torus were calculated. Sound attenuation spectra of pipes possessing di!erent bend sharpnesses are presented. A lower limi