The magnetic nanoparticle composite NiFe2O4 has traditionally been studied for high-frequency microwave absorption with marginal performance towards low-frequency radar bands (particularly L and S bands). Here, NiFe2O4 nanoparticles and nanohybrids using large-diameter graphene oxide (GO) sheets are prepared via solvothermal synthesis for low-frequency wide bandwidth shielding (L and S radar ba...

In this research work cobalt-ferrite (CoFe2O4) nanoparticles were synthesized by a simple, general sol-gel auto-combustion method. For this study, electromagnetic (EM) wave absorbing coatings with different weight fractions of nano-carbon and CoFe2O4 (which, arises from both dielectric and magnetic contributions) and polymeric epoxy resin were prepared and their characteristics were fully inves...

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...

We have wrapped metallic cylinders with strongly absorbing metamaterials. These resonant structures, which are patterned on flexible substrates, smoothly coat the cylinder and give it an electromagnetic response designed to minimize its radar cross section. We compare the normal-incidence, small-beam reflection coefficient with the measurement of the far-field bistatic radar cross section of th...

The electromagnetic and radio-absorbing characteristics offerrite-polymer composites with conductive inclusions based on polyvinylalcohol are investigated. Ni-Zn spinel ferrite powder of 2000NN gradewith composition Ni 0.32 Zn 0.68 Fe 2 O 4 was used as filler. It is shown that theobtained effective absorbers in the frequency range 2-5 GHz peak reflection loss less than ~20 dB. Through analysis ...

Radar, which is an electronic and electromagnetic system that works with the use of radio waves to detect locate objects, has led need for radar absorber materials some military applications, especially defence security. In this study, barium hexaferrite copper powders were used investigate a absorbing composite material. Barium synthesized by Sol-Gel method. added polyurethane resin at differe...

Background: The Mars Express and Mars Reconnaissance Orbiter spacecraft both carry radar sounder systems (MARSIS and SHARAD). These instruments transmit a radar signal with wavelength of meters to tens of meters, and penetrate to depths of several km in typical dry crustal rocks. Sounders, however, provide relatively coarse horizontal resolution (1-10 km), and cannot reveal detail of the near-s...

The ultraviolet absorption spectrum of the cold acid-soluble portion of the blood of steers had a maximum absorption at 297 nanometers. This unusual spectrum was due to the large amount of uric acid riboside that was present. It accounted for over 96% of the material absorbing at 290 nm and for about 50% of the material absorbing at 260 nanometers. Other ultraviolet absorbing compounds present ...

Wave absorbing materials are widely used to prevent military equipment from being detected by radar wave and also serve as civil electromagnetic shielding. The properties of determined a combination the parameters thickness composite material. In actual case, theoretically designed reflection loss peak intensity bandwidth deviate engineered values. There few reports on mechanism about variation...