A logamediate inflationary model in the presence of the tachyon scalar field will be studied.Considering slow-roll inflation, the equations of motion of the universe and the tachyon field will be derived. In the context of perturbation theory, some important perturbation parameters will be obtained and using numerical calculations the consistency of our model with observational data will be illustrated.PACS numbers: 98.80.Cq,

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HYDROTHERMAL SYNTHESIS OF HIGHLY UNIFORM CHALCOPYRITE CuFeS 2 NANOPARTICLESIn this research work, high uniform CuFeS 2 chalcopyrite with 20-40 nm particles were synthesized via a simple hydrothermal method. Different analysis were used to characterize the obtained product such as X-ray diffraction pattern (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and thermal gravimetric analysis (TGA). The photocatalytic activity of the product was investigated by degradation three different dyes namely acid brown, acid red and methylene blue. The results showed the synthesized CuFeS 2 nanoparticles have high photocatalytic activity and can degrade the used dyes in large quantities.