New ambient sound absorption material,lightweight isocyanate-based polyimide foam(IBPIF),was fabricated by operable combination between different distinctive acoustic IBPIF.Cellular structure of IBPIF was facilely and...New ambient sound absorption material,lightweight isocyanate-based polyimide foam(IBPIF),was fabricated by operable combination between different distinctive acoustic IBPIF.Cellular structure of IBPIF was facilely and obviously adjusted by increased slurry temperature corresponding to change in distinctive acoustic properties.Moreover,density of all IBPIF kept at only 12-17 kg/m3.With increasing slurry temperature from 0℃to 40℃,cell size and window opening rate gradually increased from 553μm to 791μm and from 6.85%to 58.46%,respectively.In this study,IBPIF generated by slurries at 0℃(marked as PIF-2)and 40℃(marked as PIF-6)showed best and distinctive acoustic behavior in 315-800 Hz and 800-6300 Hz regions,respectively.After acoustic behavior study of combined IBPIF prepared by stitching combination between two distinctive acoustic IBPIFs,results showed that only when PIF-6 sheet used as sound receiving surface even though with thickness of only 10 mm could the combined IBPIF possess the best acoustic level in 800-6300 Hz region as PIF-6.Furtherly,acoustic behavior in 315-800 Hz region could be significantly enhanced by increasing thickness of PIF-2 and could reach or close to the best acoustic level.展开更多
"生活风格"(style of life),是布尔迪厄代表作《区分》的核心概念之一。布尔迪厄吸收马克思的资本理论、涂尔干的原始分类学,以及马克斯·韦伯关于"生活风格"是界定不同阶级、阶层之关键因素的论述,通过分析不..."生活风格"(style of life),是布尔迪厄代表作《区分》的核心概念之一。布尔迪厄吸收马克思的资本理论、涂尔干的原始分类学,以及马克斯·韦伯关于"生活风格"是界定不同阶级、阶层之关键因素的论述,通过分析不同群体日常生活消费的趣味差异,建构其现代社会分类学。"生活风格"是由不同社会空间中的人们拥有的资本及其属性所决定的日常消费偏好,"生活风格"呈现的趣味差异,可以区分不同的阶级、阶层,人们在社会空间中与生俱来所占有的位置及其变化,决定了趣味是必然性与历史性的统一,人们因趣味而维持或者改变"生活风格",其实质是为了争夺社会空间的相应位置和阶级结构的再生产,"生活风格"因此具有其象征性。展开更多
基金financially supported by the Fundamental Research Funds for the Central Universities(No.3072020CF1019)Heilongjiang Provincial Postdoctoral Science Foundation(No.LBH-Z19137)Natural Science Foundation of Heilongjiang Province(No.LH2019E038)。
文摘New ambient sound absorption material,lightweight isocyanate-based polyimide foam(IBPIF),was fabricated by operable combination between different distinctive acoustic IBPIF.Cellular structure of IBPIF was facilely and obviously adjusted by increased slurry temperature corresponding to change in distinctive acoustic properties.Moreover,density of all IBPIF kept at only 12-17 kg/m3.With increasing slurry temperature from 0℃to 40℃,cell size and window opening rate gradually increased from 553μm to 791μm and from 6.85%to 58.46%,respectively.In this study,IBPIF generated by slurries at 0℃(marked as PIF-2)and 40℃(marked as PIF-6)showed best and distinctive acoustic behavior in 315-800 Hz and 800-6300 Hz regions,respectively.After acoustic behavior study of combined IBPIF prepared by stitching combination between two distinctive acoustic IBPIFs,results showed that only when PIF-6 sheet used as sound receiving surface even though with thickness of only 10 mm could the combined IBPIF possess the best acoustic level in 800-6300 Hz region as PIF-6.Furtherly,acoustic behavior in 315-800 Hz region could be significantly enhanced by increasing thickness of PIF-2 and could reach or close to the best acoustic level.
文摘"生活风格"(style of life),是布尔迪厄代表作《区分》的核心概念之一。布尔迪厄吸收马克思的资本理论、涂尔干的原始分类学,以及马克斯·韦伯关于"生活风格"是界定不同阶级、阶层之关键因素的论述,通过分析不同群体日常生活消费的趣味差异,建构其现代社会分类学。"生活风格"是由不同社会空间中的人们拥有的资本及其属性所决定的日常消费偏好,"生活风格"呈现的趣味差异,可以区分不同的阶级、阶层,人们在社会空间中与生俱来所占有的位置及其变化,决定了趣味是必然性与历史性的统一,人们因趣味而维持或者改变"生活风格",其实质是为了争夺社会空间的相应位置和阶级结构的再生产,"生活风格"因此具有其象征性。
