Results 211 to 220 of about 103,759 (256)
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A discussion on molecular absorption noise in the terahertz band
Nano Communication Networks, 2016Abstract This paper focuses on molecular absorption noise caused by molecular absorption in the higher frequency bands, such as THz band (0.1–10 THz). This transmission induced noise has been predicted to exist in the THz band, since the conservation of energy requires the conservation of the absorbed energy in the medium. There exist multiple models
Janne Lehtomäki +2 more
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Absorptive noise barrier development
Proceedings of Meetings on Acoustics, 2023This paper reveals the development of an absorptive, self-supporting noise barrier panel for external applications. Designed for use as a temporary external noise barrier for construction sites and roadside noise barriers. The absorptive noise barrier panel is a module base design that is easy to assemble, disassemble, and re-deploy.
Harvey Law, Jenny Law, Marek Kierzkowski
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Study on the Noise Reduction of Sound Absorption Noise Barrier
Materials Science and Engineering, 2017Wen-Jun Luo, Gong-Yu Liu
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Noise absorption by woven fabrics
Applied Acoustics, 1990Abstract The paper describes an investigation of the relationship between the noise absorption coefficients of a cover made of woven fabric and its intrinsic parameters. The parameters considered were: fibre content, yarn count, cover factor, the air gap behind the fabric, the frequency of the impinging sound wave, and the influence of washing on the
Y. Shoshani, G. Rosenhouse
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Noise Absorption of Automotive Seats
SAE Technical Paper Series, 1998<div class="htmlview paragraph">Seat covers made from textiles, leather and vinyl were evaluated for noise absorption. The textiles included woven velours, pile knits and flat wovens. The noise absorption of the covers and the corresponding seat assemblies was tested by the reverberation room method per ASTM C423.
Pusheng Chen, Gordon Ebbitt
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Absorption Technique for Road Noise
SAE Technical Paper Series, 2009<div class="htmlview paragraph">It is becoming common in recent years to take measures on vehicle interior noise by balancing other performances or by using acoustic materials that are advantageous in terms of weight and cost. However, acoustic materials for vehicles are mainly for reduction of high-frequency noise in the vehicle interior, and ...
Naoko Yorozu +2 more
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Air Absorption Of Traffic Noise
Journal of Sound and Vibration, 1993Air absorption is considered as a phenomenon modifying geometrical spreading. Expressions for the maximal A-weighted sound pressure level and the A-weighted sound exposure level are derived for train noise. They are given in terms of the tabulated change in sound pressure level due to air absorption for particular values of characteristic frequency ...
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Absorption Spectroscopy beyond the Shot-Noise Limit
Physical Review Letters, 1988Description d'un nouveau spectrometre a absorption: utilisation d'un oscillateur parametrique, avec element absorbant place a l'interieur de la ...
Lane, A. S., Reid, M. D., Walls, D. F.
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Noise Reduction by Absorption, Shielding and Isolation
American Industrial Hygiene Association Quarterly, 1956(1956). Noise Reduction by Absorption, Shielding and Isolation. American Industrial Hygiene Association Quarterly: Vol. 17, No. 1, pp. 17-19.
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Cosmic noise absorption measurements
Journal of Atmospheric and Terrestrial Physics, 1961Abstract Results of cosmic noise absorption measurements at 27.5mc./s made at Stanford, California, and Pullman, Washington, during 1958 are presented. A method introduced by Mitra and Shain of extracting F layer absorption from total absorption, and an extension of this method to remove D layer absorption are described.
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