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The acoustical properties of compound impedance in a double layer sound absorbing structure is studied,Base on that,A model is constructed to optimize the double layer structure. 研究了由穿孔板及吸声材料构成的双层阻抗复合吸声结构,在此基础上建立了其声学性能模型,并通过建立优化数字模型,对其结构的各个几何参数和物理参数进行了优化设计。
Advances in Study and Research on Acoustic Property of Wood for Soundboard of Musical Instrument 乐器共鸣板用木材的声学特性研究进展
The basic properties of wood such as moisture content, density, grain direction and modulus of elasticity can be measured nondestructively. 摘要与木材材质有关之因数如含水率、比重、木理走向、弹性系数等可藉破坏或非破坏方法来测定或推定。
The research aimed to improve the fire retardant properties of wood through treatment with phosphoryl triamides. 摘要本研究目的在于以磷醯三胺化合物改善木材之耐燃性质。
This is a key concept in wood design since moisture affects the physical and mechanical properties of wood differently depending on whether the MC% is above or below the FSP. 因为含水量影响木材的结构属性，所以木材这种吸收和释放水分的能力对于木材设计来说是相当重要的。
GB/T 17657-1999 Test methods of evaluating the properties of wood based panels and surface decorated wood-based panels[S].Beijing:Standards Press of China,1999. GB/T17657-1999人造板及饰面人造板理化性能试验方法[S]北京:中国标准出版社;1999.
As for acoustical property, the property of SRA is closer to rigid, so the sound absorption coefficient is lower under the same pavement type. 在音学性质方面，SRA因性质偏向刚性，故在相同铺面型式下系其吸音系数较低。
acoustical properties of the sea floor 海底声学特性
ACOUSTICAL PROPERTIES OF YONGLE BELL 永乐大钟的声学特性
The properties of N-P intumescent flame-retardant made from urea-phosphate liquor were tested in this paper, the flame retardancy and applied performance of wood treated by this flame-retardant were measured. 摘要对用磷酸脲的结晶母液合成的氮－磷膨高效胀型阻燃剂性能进行了研究，测定了经该阻燃剂处理后的木材的耐火性能和使用性能。
Cork granule was mixed with wood fiber and pressed into a kind of wood fiber-reinforced cork panel with thickness of 4mm, and the influence of wood fiber on properties of the panel were explored. 笔者将木材纤维与软木粒子均匀混合后,压制成厚度4mm的软木制品,探索木材纤维对软木制品性能的影响。
He is studying the properties of these particles. 他在研究这些粒子的性质。
For understanding thermal stabilities of woo-montmorillonite (MMT) composite (WMC), thermal properties of wood, wood-phenol formaldehyde resin composite (WPC) and WMC were analyzed and compared using thermal analysis (TA). 摘要为了了解木材－蒙脱土复合材料的热稳定性，本文利用热分析方法对木材、木材－酚醛树脂复合材料、木材－蒙脱土复合材料进行了对比分析。
The gas bubbles affect the acoustic properties of the line by energy dissipation as well as by added compliance. 气泡改变了管道的声学性质，这是由于能量的耗散和增加了顺从性的缘故。
This paper studies the influence of adding chemical coupling,changing the dosage of polyethylene and polypropylene on mechanical properties of wood fiber and plastic complsite(WPC) panel. 通过聚乙烯、聚丙烯分别与木纤维复合制板工艺的研究,探讨加入助剂、改变聚乙烯、聚丙烯用量对复合材料力学性能的影响。
In the present paper, a discrete-vortex model is employed to study nonlinear acoustic properties of an orifice. 本文从波涡相互作用机制出发,发展了一种旨在研究矩形穿孔板在切向流条件下非线性效应的离散涡模型。
The acoustic properties of ultrasound and the interaction of biomaterial and cavitation are analyzed. 剖析了超声波的声学性质、超声空化效应及其与生物介质相互作用的机理;
This paper discusses the factors affecting the properties of wood plastics composites including the effects of compatibility,fluidity,processing and puts forward the relevant improving methods. 介绍了影响木塑复合材料性能的几种因素,其中包括相容性、流动性、加工工艺的影响,并提出了相应的改善方法。
Room - Simulates the acoustic properties of a classic echo chamber that consists mainly of early reflections. 房间模拟的声学特性一个典型的回声商会认为，主要是早期的思考。
The history and development is revie wed for PMDI as binders in manufactur e of wood -based panel.such as fiberboard in which of the properties of PMDI and the proble ms in the application of it. 介绍聚合MDI作为粘合剂应用于人造板加工业的起源、发展、特点及工业化中尚存在的一些问题及解决方法。