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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。
- A new type of porous sound absorbing material was made from super-strength gypsum and glass fiber. 摘要以高强石膏为胶凝材料,内掺玻璃纤维,制备出一种新型多孔吸声材料。
- A shaking table test is done to study the effect of shock absorbing layer of the portal part of tunnel in strong ground motion zone. 为了研究强震区隧道洞口段设置减震层的减震效果,对隧道结构进行了振动台模型试验。
- A new sound absorbing foamed compound mainly made from PVC resin,EPR and rockwool has been investigated by foaming process. 以PVC树脂、EPR和岩棉为主要原材料用发泡方法制成了一种中低频吸声性能优良的新型泡沫吸声材料。
- TE surface waves in absorbing layers with high losses are studied. 研究TE表面波在高损耗吸收层中的特性。
- A new sound absorbing material that is good in sound absorbing at the low frequency and high frequency is made from PVC and rockwool in this paper. 利用PVC和无机物等研制了一种性能优良的吸声材料。
- Flexo plate with plate (also known as digital flexo) peripherin-layer coating on the top of a layer of black UV absorbing layer, the layer is also sensitive to infrared. 激光烧蚀后,即可对印版进行曝光,保留在印版空白处的黑色涂层挡住光线,而图文处的感光胶层由于失去了黑色图层的保护,发生光聚合反应,即形成印刷网点。
- Thecapability of preventing burning, self-extinguishing, heat-insulation , smoke suppressing, sound absorbing and shockproof.. 具有阻燃、自熄、隔热、消烟、吸音、抗震等性能。
- Based on high viscous asphalt, this paper mainly studied the following four topics: Firstly, FEM (finite element method) was used to analyze the effect of stress absorbing layer. 本文以高粘性沥青为结合料,主要对以下四方面内容进行了研究:首先,用有限元方法计算分析应力吸收层防治反射裂缝效果。
- One effective solution to this conflict is to use a resonant cavity enhanced (RCE) photodetector.In the RCE photodetector, the absorbing layer is put inside a Fabry-Perot cavity. 谐振腔增强型(RCE)光探测器为这一矛盾的解决提供了有效的方案。
- A new type of sound absorbing materials mainly made from low alkaline cement and expanding pearlite has been investigated on the basis of sound absorption principle. 摘要以低?A水泥和膨胀珍珠岩为主要原料,辅之以分散性良好的增强剂聚丙烯纤维,研制出一种新型吸声材料。
- This compound materials used in absorbing material is with sound absorbing function and light quality, wide band, good compatibility and strong inoxidizability. 这种复合材料用于吸波材料,它不仅具备良好的吸波功能,还兼备质量轻、宽频带、兼容性好和耐腐蚀性强等优点。
- The two rooms both adopted American Milliken carpet and high-class beech surface sound absorbing wall, which can ensure the comfort and privacy of the meeting. 两处会场均选用了美国Milliken地毯和高档枫木饰面吸音墙面,可保证会谈的舒适及私密。
- Effects of the content of fiber,vesicant,pore ratio and pore diameter were investigated,the results indicates the variables have great effects on the sound absorbing performance of the samples. 实验发现,孔隙率、平均孔径大小、玻璃纤维含量、发气剂含量对材料吸声性能有显著影响。
- A new type of sound absorbing material was made from super-strength gypsum and glass fiber and the sound absorp-tion coefficient of the material was tested by standing wave tube method. 以高强石膏为主要原料,内掺玻璃纤维,在发泡剂的作用下,制备出一种新型多孔吸声材料,采用驻波管法测试材料的吸声系数。
- A new cement was prepared which consisted of the composite porous sound absorbing material with portland cement, expanded perlite, ceramsite as main raw materials and some supplementary substances. 摘要以普通硅酸盐水泥、膨胀珍珠岩、陶粒主要原料,加以一定的辅助材料,研制出一种新型水泥基复合多孔吸声材料。
- In this paper waterproof sheet material and geotextile were compounded and used as stress absorbed layer, which was applied in composite pavement. 讨论了采用防水卷材与土工织物组成复合物作为应力吸收层应用于复合路面,对路面荷载应力的分析。
- CIGS thin film is the main absorber layer, which plays crucial role in enhancing the conversion efficiency of solar cell. CIGS薄膜太阳电池由于其具有成本低、效率高、稳定性好(无衰退)等优点而成为最有前途的光伏器件之一。
- Features : good abrasion resistance, ventilation, permeability, water preservation, heat insulation, sound absorbency and stability. 特点:良好的耐磨性、通风、透气性、防水、隔热、吸音和高稳定性。
- Optimization of Compound Impedance in a Double Layer Sound Absorbing Structure 双层阻抗复合吸声结构的优化设计