trigger
发表于 2025-3-25 06:39:28
https://doi.org/10.1057/9781403946041rooms (see Chaps. . and .), the amount of . required for a specific . (a) plays an important role particularly in view of low frequencies, because this can directly influence the construction costs of a building. The .. (b) and . (c) of porous/fibrous damping materials can be improved by acousticall
投射
发表于 2025-3-25 11:20:46
Policy: Energy Demand and Welfare in the UK,From the emission sound-power level L. of a source Q, which can be determined under freefield conditions, e.g. according to DIN 45 635 (1984), respectively ISO 3745 (2003), the immission sound pressure level L in its vicinity (outdoors) can be described, of course only schematically, by:
有花
发表于 2025-3-25 13:07:00
Energy Power and Automation EngineeringBased on the range of applications and market volume, by far the largest and most important group of sound absorbers is founded on the principle of providing sound waves upon impact, according to Fig. 3.1, as little resistance W as possible.
multiply
发表于 2025-3-25 18:51:04
http://reply.papertrans.cn/16/1597/159617/159617_24.png
Phenothiazines
发表于 2025-3-25 21:45:22
Passive Absorbers,Based on the range of applications and market volume, by far the largest and most important group of sound absorbers is founded on the principle of providing sound waves upon impact, according to Fig. 3.1, as little resistance W as possible.
Myosin
发表于 2025-3-26 00:50:40
Sound Absorption for Noise Control and Room-Acoustical Design,ared to its wavelength l, it is partially reflected (P.) (and possibly diffracted and scattered), allowed to pass through (P.), transmitted as structure-borne sound (P.), as well as absorbed (P.), see Fig. 3.1.
斥责
发表于 2025-3-26 05:45:43
Sound Absorbers in Room Acoustics,d consulting engineers and architects to design current state-of-the-art noise control and room acoustic measures. Special emphasis is on damping at low frequencies and using fiber-free absorbers with smooth closed surfaces, innovative tools and devices to solve acute acoustical problems.
忍耐
发表于 2025-3-26 09:35:09
http://reply.papertrans.cn/16/1597/159617/159617_28.png
漂亮
发表于 2025-3-26 15:19:05
http://reply.papertrans.cn/16/1597/159617/159617_29.png
宣传
发表于 2025-3-26 19:19:43
http://reply.papertrans.cn/16/1597/159617/159617_30.png