Carbon foam electromagnetic mm-wave absorption in reverberation chamber

Lightweight carbon-red mud hybrid foam toward fire-resistant and efficient shield against electromagnetic interference

“…Moreover, the non-conducting nature of red mud gives rise to interfacial polarization, eddy current www.nature.com/scientificreports www.nature.com/scientificreports/ loss and magnetic loss due to spin resonance, magnetic domain movement and relaxation of the magnetization. Furthermore, the porous, interconnected network structure and high surface area of carbon-red mud hybrid foam provide much better EM wave absorption activity 45 which offers a greater accumulation of charge at the carbon-red mud interface, hence an increased absorption is observed.…”

Analysis on the Acoustics of an Auditorium

“…Therefore, the pressure exerted on the layer from either side should be the same. In the absence of sound waves, the pressure of the medium on either side is the same, so sound pressure is the same at the boundary for any two materials, or 1 2 p p = (16) where 1 and 2 denotes the two different mediums.…”

“…Initially, the design of the church considered the influence of sound reflection, reverberation time and other factors on the audience [10] [11] [12] [13] [14]. Nowadays, materials that absorb sound are commonly used [15] [16] [17] and glass barrier is a good sound insulation material [18] [19].…”

Peculiarities of the microwave properties of hard–soft functional composites SrTb0.01Tm0.01Fe11.98O19–AFe2O4 (A = Co, Ni, Zn, Cu, or Mn)

“…Microwave absorbers attract much attention due to broad prospects of the practical applications (weakening of the transmitted electromagnetic radiation). [5][6][7][8] Hard and so nanocomposites are technologically important materials because of their specic applications in magnetic recording media, magnetic uids, microwave devices, permanent magnets, and biomedicines. 9,10 These magnetic composites achieve high coercivity from the Mtype hexaferrite materials (hard ferrite) and high saturation magnetization from the spinel ferrites (so ferrite), and exhibit outstanding magnetic performance called exchange-spring magnets.…”