平和学校A study on the dependence of PEMs acoustic
properties on incidence angle 期刊名称： International Journal of Pavement Engineering
soim普通高中课程标准实验教科书英语作者： Pratico, F. G,Vaiana, R,Fedele, R
emome作者机构： Univ Mediterranea Reggio Calabria,Univ Calabria德语学习资料
年份： 2015年英语学习论坛
期号： 第7-8期
np是什么意思
关键词： surface inhomogeneity;porous friction cour;sound absorption
properties;noi;angle of incidence;pavement texture;
flotsam
摘要：The objective of this paper is to study the variability of on-site acoustic measurements in non-normal conditions, as a function of the angle. A porous European mix was investigated. In order to reject the hypothesis that the cau of the variations in the acoustic properties is the surface inhomoge
neity, texture properties were investigated according to the standard ISO 13473-1 and ISO/CD TS 13473-4. The acoustic absorption coefficient was measured according to ISO 13472-1. Results were compared and analyd in terms of averages and standard deviations. Result analys may allow us to derive how absorption properties may vary as a function of the angle of incidence (under the hypothesis of homogeneous surface texture of the friction cour). A tentative theoretical framework for explaining the dependence of acoustic 栩栩如生英文
内容由中国教育图书进出口有限公司引进
>jeanswear
