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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聲材料構成的雙層阻抗復合吸聲結構,在此基礎上建立了其聲學(xué)性能模型,并通過(guò)建立優(yōu)化數字模型,對其結構的各個(gè)幾何參數和物理參數進(jìn)行了優(yōu)化設計。
- A new type of porous sound absorbing material was made from super-strength gypsum and glass fiber. 摘要以高強石膏為膠凝材料，內摻玻璃纖維，制備出一種新型多孔吸聲材料。
- 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. 為了研究強震區隧道洞口段設置減震層的減震效果,對隧道結構進(jìn)行了振動(dòng)臺模型試驗。
- A new sound absorbing foamed compound mainly made from PVC resin,EPR and rockwool has been investigated by foaming process. 以PVC樹(shù)脂、EPR和巖棉為主要原材料用發(fā)泡方法制成了一種中低頻吸聲性能優(yōu)良的新型泡沫吸聲材料。
- TE surface waves in absorbing layers with high losses are studied. 研究TE表面波在高損耗吸收層中的特性。
- 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和無(wú)機物等研制了一種性能優(yōu)良的吸聲材料。
- 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. 激光燒蝕后，即可對印版進(jìn)行曝光，保留在印版空白處的黑色涂層擋住光線(xiàn)，而圖文處的感光膠層由于失去了黑色圖層的保護，發(fā)生光聚合反應，即形成印刷網(wǎng)點(diǎn)。
- Thecapability of preventing burning, self-extinguishing, heat-insulation , smoke suppressing, sound absorbing and shockproof.. 具有阻燃、自熄、隔熱、消煙、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. 本文以高粘性瀝青為結合料,主要對以下四方面內容進(jìn)行了研究:首先,用有限元方法計算分析應力吸收層防治反射裂縫效果。
- 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. 諧振腔增強型(RCE)光探測器為這一矛盾的解決提供了有效的方案。
- 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水泥和膨脹珍珠巖為主要原料，輔之以分散性良好的增強劑聚丙烯纖維，研制出一種新型吸聲材料。
- This compound materials used in absorbing material is with sound absorbing function and light quality, wide band, good compatibility and strong inoxidizability. 這種復合材料用于吸波材料，它不僅具備良好的吸波功能，還兼備質(zhì)量輕、寬頻帶、兼容性好和耐腐蝕性強等優(yōu)點(diǎn)。
- 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. 兩處會(huì )場(chǎng)均選用了美國Milliken地毯和高檔楓木飾面吸音墻面，可保證會(huì )談的舒適及私密。
- 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. 實(shí)驗發(fā)現,孔隙率、平均孔徑大小、玻璃纖維含量、發(fā)氣劑含量對材料吸聲性能有顯著(zhù)影響。
- 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. 以高強石膏為主要原料,內摻玻璃纖維,在發(fā)泡劑的作用下,制備出一種新型多孔吸聲材料,采用駐波管法測試材料的吸聲系數。
- 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. 摘要以普通硅酸鹽水泥、膨脹珍珠巖、陶粒主要原料，加以一定的輔助材料，研制出一種新型水泥基復合多孔吸聲材料。
- In this paper waterproof sheet material and geotextile were compounded and used as stress absorbed layer, which was applied in composite pavement. 討論了采用防水卷材與土工織物組成復合物作為應力吸收層應用于復合路面,對路面荷載應力的分析。
- CIGS thin film is the main absorber layer, which plays crucial role in enhancing the conversion efficiency of solar cell. CIGS薄膜太陽(yáng)電池由于其具有成本低、效率高、穩定性好(無(wú)衰退)等優(yōu)點(diǎn)而成為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. 特點(diǎn)：良好的耐磨性、通風(fēng)、透氣性、防水、隔熱、吸音和高穩定性。
- Optimization of Compound Impedance in a Double Layer Sound Absorbing Structure 雙層阻抗復合吸聲結構的優(yōu)化設計
