发泡橡胶吸音材料

以前用玻璃棉和聚氨酯发泡材料做吸音材料 ,但这类吸音材料只对高频率有效 ,对低频率则效果不大 ,该文作者用 EPDM橡胶作发泡材料 ,其吸音率的峰值可以在不同频率范围内根据设计要求而发生位移 。

防火吸音板

台湾南亚塑料公司新推出一种具有高吸音特性的防火吸音板。该产品由玻璃布与刺孔铝箔等高性能吸音材料制成,外边配以全属框架。经测试,这种防火吸音板符合一级耐燃标准,平均残音吸音率达0.6％以上,几乎完全不吸水。由于使用了玻璃布和镀镜铁框等材料,

一种轻型阻燃的隔音板

日本一家公司新近研制出利用回收的玻璃为发泡体,结合材料加固发泡体,玻璃纤维增强发泡体两面的新型隔音建筑材料。 这种隔音板由粘合树脂点粘接无机质粒子(硅砂或再生发泡玻璃骨料),粘子间隙形成连续气孔结构。

砼领域废轮胎再利用的研究

对于伴随经济成长剧增的产业废弃物，确保其处置场所困难起来，存在着处理费用昂贵的问题，另外由此引发的非法废置造成的环境污染等成为当今的社会问题。作为其对策之一，近年在各领域进行了各种再生利用研究。

The Influence of an Acoustic Field on the Bed Expansion of Fine Particles

Fine particles are difficult to fluidize due to strong interparticle attraction.An attempt has been made to study the bed expansion of silica gel(dp=25μm) powder in presence of an acoustic field.A 135 mm diameter fluidized bed activated by an acoustic field with sound intensity up to 145 dB and frequency from 90 Hz to 170 Hz was studied.The effects of sound pressure level,sound frequency and particle loading on the bed expansion were investigated.Experimental results showed that,bed expansion was good in presence of acoustic field of particular frequency.In addition,it was observed that in presence of acoustic field the bed collapses slowly.