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Articles by M. Ahmadian
Total Records ( 2 ) for M. Ahmadian
  M. H. Ehrampoosh , GH .R. Moussavi , M. T. Ghaneian , S. Rahimi and M. Ahmadian
  In this study, photocatalytic degradation of methylene blue was examined using different concentrations of TiO2 nano-particles (diameters less than 21 nm) and ultraviolet (UV-C) radiation in a tubular reactor. Different concentrations of catalyst (0.3-1.2 g/L), different pH conditions (3, 7 and 9) and dye concentration (15, 30 and 60 mg/L) as well as sample rotation level (125 mL/min) were studied. The sample passed 1-7 times through the quartz reactor exposed to UV-C ray (constant intensity = 2.8 mW/cm2) (every rotation time was 8 min). Results of this research showed clearly that methylene blue is significantly degradable by TiO2 and UV-C radiation. Increasing dye concentration resulted in decreased efficiency and thus, as more samples passed through quarts tube, removal efficiency increased. Methylene blue with concentration of 15 mg/L and after 7 rotations in the reactor (56 min) was removed with the efficiency of 98%. Subsequent to dye removal, 47% of initial COD decreased simultaneously.
  S. Salari , M. Ardebilipour and M. Ahmadian
  In this study, we present a new reduced-complexity scheme for Maximum-Likelihood (ML) estimate of both Carrier-Frequency Offset (CFO) and channel coefficients in multi antenna OFDM transmission, assuming that a training sequence is available. Our scheme is also capable to accommodate any Space-Time Coded (STC) transmission. Moreover, to benchmark the performance of the proposed scheme, the Cramer-Rao Bounds (CRBs) are derived for both CFO and channel estimators. Simulation results show that the proposed scheme achieves almost ideal performance compared with the CRBs in all ranges of Signal-to-Noise Ratios (SNR) for both channel and frequency offset estimates.
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