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开孔型多孔隙泡沫金属材料以其高度均匀的孔结构、连续规则重叠的孔分布、极好的通透性及良好的导电性等优点,广泛应用于各类电子设备通风散热装置的电磁加固.文中采用沉积法制备高通透多孔隙泡沫镍,通过对样品的导电率及屏蔽效能进行测试,结果表明多孔隙泡沫镍在孔隙率大于95%时,导电率仍达到105 S/m,导电性良好;屏蔽效能达到25 dB(10 kHz)、87 dB(15 MHz)、46 dB(18 GHz)等,在很宽的频率范围均有很好的屏蔽效能.进一步采用三维模型法,基于多孔隙泡沫镍大多数相同孔的立体网状骨架结构特性,建立电磁传输十二面体基本结构单元模型,探讨了多孔隙泡沫镍的屏蔽机理,为高通透多孔隙泡沫金属材料的电磁防护应用提供有益指导. 相似文献
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Alternative Ag and SiO2 multilayers are prepared by using radio frequency magnetron sputtering. The Ag particles are found to diffuse toward and mostly accumulate near the surface of the Ag—SiO2 composite film via a rapid thermal treatment. Different shapes of the Ag particles are obtained by changing the thickness of each Ag and SiO2 layer. The response absorption property of the Ag composite film is also investigated. We relate the resonance absorption to the surface level and the Fermi level. To induce the obvious resonance absorption in an Ag composite film, it is necessary to maintain special shapes with sharp edges and wide terraces and to maintain the particle sizes ranging from 0 nm to 100 nm. 相似文献
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针对DSP和FPGA相结合的处理机结构进行了研究,分析了现行SIMD和MIMD结构下的数字信号处理机制的优劣,在此基础上提出了一种实时信号处理的线性流水阵列,通过实例证明了该结构的优越性能。 相似文献
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