This review focuses on two systems, nanocrystalline Zn substituted Co1-xZnxFe2O4 (0≤x≥1) and Ni0.4Zn0.2Mn0.4Fe2O4, were synthesized using microwave hydrothermal and auto-combustion method respectively. The synthesized powders were characterized by X-ray diffraction (XRD), transmission electron microscope (TEM), thermo-gravimetricdifferential thermal analysis (TG-DTA) and FTIR. The average parti...

Acoustical parameters of porous materials give the necessary and important information for noise control engineers. Profound knowledge their physical characteristics enable an effective sound absorber material design. The theory of sound-absorbing materials has progressed considerably during the last decade. A noise control engineer with serious interest in sound absorbing technology is advised...

The feasibility and extraordinary properties of mirrorless optical parametric oscillations in a microscopic strongly absorbing slab of negative-index metamaterial are shown. They stem from the backwardness of electromagnetic waves inherent with this type of metamaterial.

Developing biomass-derived three-dimensional porous carbon materials (porous foam, PCF) has become a common strategy to obtain lightweight and efficient electromagnetic microwave-absorbing materials. Without the introduction of template subsequent activation process, several ultra-lightweight honeycomb PCF samples were successfully prepared from dried ballonflower/yamakurage (DB) by simple calc...

Electromagnetic wave absorbing (EMA) materials at high temperatures are limited by poor conduction loss. However, adding conductors simultaneously increases loss and interface polarization loss, leading to a conflict between impedance matching electromagnetic This will prevent waves from entering EMA materials, finally reducing the overall performance. Here, effective electrical conductivity is...

Composites containing conducting inclusions are required in many engineering applications, especially, for the design of microwave shielding enclosures to ensure electromagnetic compatibility and electromagnetic immunity. Herein, multilayer shielding structures are studied, with both absorbing and reflecting composite layers. In this paper, fiber-filled composites are considered. For modeling a...