Papers by Author: Yuan Liu

Abstract: NiFe2O4 ferrite was synthesized by sol-gel method. Its structural characteristics, morphology, electromagnetic and microwave absorption properties were analyzed by X-ray diffraction, scanning electron microscope and network analyzer, and analyzed the influence of the combustion temperature and citric acid. The results indicated that the particle size be enlarged with an increased combustion temperature and be diminished first, then increased with the increased of citric acid, and the best ratio of citric acid with metal ions for nCA: nFe: nNi = 4:2:1. Its microwave absorbing property is increased with the increased combustion temperature. Its complex permittivity imaginary part first decreases with temperature increases and then increases, the imaginary part of complex permeability with increasing temperature increases, indicating that the increase of calcination temperature, help to improve the sample microwave absorbing properties.

Abstract: The combined process of Electrolyzed oxidizing water(EOW)and membrane bioreactor(MBR)was applied to treat the UDMH wastewater, and its treatment efficiency was compared with that by MBR alone．In the combined process, the treatment efficiency of UDMH wastewater is better than MBR alone. When the influent COD and UDMH are 800 to 1000 mg•L^-1 and 300 mg•L^-1, the effluent COD and UDMH are about 55 mg•L^-1 and 0.3 to 1.5 mg•L^-1 respectively, close the demand of the Discharge standard of water pollutants for space propellant．In the MBR process alone，the effluent COD and UDMH are about 90 mg•L^-1 and 45 mg•L^-1 respectively, which worse than the combined process EOW-MBR, especially the effluent UDMH far beyond the demand of the Discharge standard of water pollutants for space propellant．