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Composite masonry walls combine multiple wythes of the same or different masonry materials to create a unified structure. These walls feature wythes that are bonded together either through mortar-filled collar joints, grouted spaces, or more commonly, with rigid metal ties and reinforcements, with the use of masonry header units being rare. Metal ties are preferred because they effectively minimize water penetration, as these walls primarily absorb moisture and then release it into the...
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The existence of combined electric and magnetic fields that propagate through space as electromagnetic (EM) waves is the most significant prediction of Maxwell's equations. As Maxwell's equations hold in free space, the predicted electromagnetic waves do not require a medium for their propagation. An EM wave comprises an electric field, defined as the force per charge on a stationary charge, and a magnetic field, which is the force per charge on a moving charge.
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Consider a plane wavefront traveling in position x-direction with a constant speed. This wavefront can be utilized to obtain the relationship between electric and magnetic fields with the help of Faraday's law.
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Simulation, Fabrication and Characterization of THz Metamaterial Absorbers
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灵感来自翅的多功能元材料

Haoran Pei1,2, Hang Yang2, Ning Zhang2

  • 1State Key Laboratory of Advanced Polymer Materials, Polymer Research Institute of Sichuan University, Chengdu, 610065, China.

Advanced materials (Deerfield Beach, Fla.)
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PubMed
概括
此摘要是机器生成的。

灵感来自的超材料提供先进的吸声,隔热和抗冲击性能. 这种生物灵感设计为多功能应用提供了卓越的降噪和能量消耗.

关键词:
生物灵感设计的设计宽带声音吸收 宽带声音吸收机械能耗散机械能耗散的方法多功能的超材料.热绝缘 热绝缘 热绝缘 热绝缘

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科学领域:

  • 材料科学 材料科学 材料科学
  • 生物启发工程 生物启发工程
  • 声学 声学 声学 声学

背景情况:

  • 飞拥有翅膀,可以吸收和分散超声波蝙蝠的电话,以逃避捕食者.
  • 开发具有集成声学,热力和机械性能的多功能材料是一个重大挑战.

研究的目的:

  • 为了创建一个生物灵感的超材料模仿虫的宽带声音吸收.
  • 将隔热和机械能耗整合到一个单一的结构框架中.
  • 使用计算方法和增材制造优化声学性能.

主要方法:

  • 生物灵感来自于翅膀尺度架构,用于分级毛孔设计.
  • 基因算法优化用于声学性能增强.
  • 用于金属材料制造的3D打印.
  • 声学,热学和机械性质的表征.

主要成果:

  • 实现宽带声学吸收 (平均系数为0.742从1000-6000 Hz).
  • 与头盔应用中的商业泡相比,证明了优异的降噪.
  • 对于增强的机械能耗和冲击弹性,表现出负的波桑比率.
  • 实现低导热率 (30.2 mW m-1 K-1) 提供有效的隔热.

结论:

  • 利用生物架构,可以在轻型超材料中同时集成多种功能.
  • 开发的超材料为多功能设计提供了一个新的范式,在降噪和防护装备方面有应用.
  • 生物灵感设计为创建具有定制声学,机械和热性质的先进材料提供了途径.