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Articles by A. Simchi
Total Records ( 2 ) for A. Simchi
  H.R. Hafizpour , M. Sanjari and A. Simchi
  A neural network (ANN) model was developed to predict the densification of composite powders in a rigid die under uniaxial compaction. Al–SiC powder mixtures with various reinforcement volume fractions (0–30%) and particle sizes (50 nm to 40 μm) were prepared and their compressibility was studied in a wide range of compaction pressure up to 400 MPa. The experimental results were used to train a back propagation (BP) learning algorithm with two hidden layers. A sigmoid transfer function was developed and found to be suitable for analyzing the compressibility of composite powders with the least error. The trained model was used to study the effect of reinforcement particle size and volume fraction on the densification of Al–SiC composite powders. The outcomes of the ANN model are analyzed based on the mechanisms of densification, i.e., particle rearrangement and plastic deformation. The proper condition of compaction for achieving the highest density by tailoring the reinforcement particle size and volume fraction dependent on the compacting pressure is presented.
  M. Mahmoudi , A. Simchi , M. Imani , P. Stroeve and A. Sohrabi
  Magnetite (Fe3O4) nanostructures with different morphologies including uniform nanoparticles, magnetic beads and nanorods were synthesized via a co-precipitation method. The synthesis process was performed at various temperatures in the presence of polyvinyl alcohol (PVA) at different concentrations. It is shown that small amounts of PVA act as a template in hot water (70 °C), leading to the oriented growth of Fe3O4 nanorods, which was confirmed by selected area electron diffraction. Individually coated magnetite nanoparticles and magnetic beads were formed at a relatively lower temperature of 30 °C in the folded polymer molecules due to the thermo-physical properties of PVA. When a moderate temperature (i.e. 50 °C) was used, nanorods and nanobeads co-existed. At higher concentrations of PVA (polymer/iron mass ratio of 5), however, the formation of magnetic beads was favored. The nanorods were shown to be unstable upon exposure to electron beams. Freezing/thawing process was applied post synthesis as temperature programming to fabricate stable nanorods with rigid walls.
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