The closed cell polyimide foams were fabricated by foaming the precursor balloons, and the foams' acoustic absorption properties were tested.
采用前驱体微球法制备闭孔聚酰亚胺泡沫，并对其吸声性能进行了研究。
These 'trees' provide seating, shade and acoustic absorption and at night they serve as an illuminate bodies which fill the room with white or blue glowing light.
这些“树”形的家具可以坐、可以遮阴、可以吸声，夜晚还可以做为发光体透出白色或者蓝色的光。
The noise-deadening property was also analyzed and pointed that it was a new composite material which has much high performance such as excellent noise-deadening and acoustic absorption etc.
对该降噪复合材料的降噪性能进行了测试分析，结果表明这是一种轻质、吸声隔声效果较好的新材料。
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