【摘 要】
：
An impulse response technique has been investigated by application to the open screens for obtaining sound transmission loss. The measurements of such screens
【机 构】
：
Acoustic research Unit, School of Architecture and Building Engineering the University of Liverpool
【出 处】
：
Chinese Journal of Acoustics
论文部分内容阅读
An impulse response technique has been investigated by application to the open screens for obtaining sound transmission loss. The measurements of such screens according to ISO 140 were also presented. The predicted results calculated by a model which is based on Huygen’s principle and Kirchhoff’s formulation have shown good agreements with the results obtained by impulse method. The method requires no specialist acoustic facilities and measurement systems can be portable.
An impulse response technique has been investigated by application to the open screens for obtaining sound transmission loss. The measurements of such screens according to ISO 140 were also presented. The predicted results calculated by a model which is based on Huygen’s principle and Kirchhoff’s formulation have shown good agreements with the results obtained by impulse method. The method requires no specialist acoustic facilities and measurement systems can be portable.
其他文献
近年来,常州地区生料床栽平菇中,疣孢褐地碗菌的危害日趋严重,极大地损害了菇农利益。1993年10月至1994年5月,笔者对该杂菌进行了调查和防治研究,现将结果初报如下:一、危害
果苗是建立果园的物质基础,其优劣好坏直接关系到果树的成活、生长结果及果实品质。因此,在选购果苗时应做到“八看”:一看品种。优质果苗应品种纯正,砧木与接穗亲和力强,做
介绍了鞍钢5500mm宽厚板生产线开发生产低屈强比、铁素体、贝氏体双相管线钢的工艺和性能,该类双相钢具有高强度、高韧性、低屈强比等特点,纵向力学性能优良;成分设计上采用
本文报告了《中国比内测验》在新疆石河子城乡426名中小学生中的试用结果。认为该量表在新疆汉族儿童少年中是基本适用的,具有评分明确,实施简便,结果可靠的优点。信度检验IQ
目的:分析在接受颈动脉狭窄内膜剥脱术治疗的患者中,应用预见性护理的实际效果.方法:选择我院2019年1月至2020年1月收治的68例接受颈动脉狭窄内膜剥脱术治疗的患者为样本,将
壮阳有广义狭义之分,广义的壮阳是指用温补药强壮心肾阳气的一类治法。狭义的壮阳,专指用药物补肾益精即补益性机能的一类治法。本文所说的壮阳药,正是专指补益性机能的药物
1.适于棚菜根外追肥的肥料种类对棚菜进行根外追肥,应根据不同蔬菜、不同生育期加以选择。如尿素属速效氮肥,中性,易被作物吸收;过磷酸钙和磷酸二氢钾都是良好的磷、钾肥,且
1992～1993年我在邵阳市东郊渔场利用867平方米的池塘养鱼并在堤埂种葡萄,1993年验收,总产鲜鱼1182公斤,净产988.2公斤,667平方米净产760.1公斤,产葡萄608公斤。总收入6765元,
目的:分析青年血液透析患者的心理压力状况,探讨其干预对策,提高患者的生活质量.方法:纳入分析某院2018年1月至2019年1月收治的132例青年血液透析患者的临床资料,将患者随机
本文介绍了宝钢厚板5m轧机宽薄板拓展中遇到的诸多问题,如轧制中板形不良、钢板跑偏、模型加道次等,这些问题的存在大大影响了宽薄板轧制的稳定性.文中对这些问题产生的原因