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无纤维吸声材料研究进展 总被引:4,自引:0,他引:4
简要地介绍了吸声材料的基本特点,阐述无纤维性吸声材料(特别是微穿孔板吸声结构)取代传统的纤维性吸声材料的可能性及其重要意义,较详细地介绍了近年来德国以及我国科研人员在纤维吸声材料研究上取所得的进展。 相似文献
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A modified QuEChERS-gas chromatography-mass spectrometry method using multi-walled carbon nanotubes (MWCNTs)as adsorbent was established for the determination of 72 pesticide residues in Lonicera japonicae Flos. The sample was extracted with Association of Official Agricultural Chemists (AOAC)extracting package,purified with MWCNTs-modified purification tube,analyzed with dynamic multiple reaction monitoring mode,and quantified with external standard method of matrix-matched standard curve. The 72 pesticides showed good linearities in the corresponding concentration ranges with correlation coefficients greater than 0.9936. The limits of detection were 0.001-0.178 μµg/kg,and the limits of quantitation were 0.002-0.593 μµg/kg. The average recoveries for four spiked levels ranged from 60.1% to 118.0%,with the relative standard deviations of 2.2%-17%. © 2023, Youke Publishing Co.,Ltd. All rights reserved. 相似文献