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- SourceAvailable from: Majid Vaseghi[Show abstract] [Hide abstract]
ABSTRACT: Equal channel angular pressing (ECAP) is a substantial process for producing ultra-fine grains in bulk metallic materials by means of severe plastic deformation. In this study, microstructure evolution through dynamic ageing characteristics associated with the application of ECAP to Al6061 alloy at high temperature was investigated. The behavior of the material under ECAP, including the dislocation density and cell size evolution as well as precipitation development, was modelled using dislocation density-based model. Followed by ECAP, microstructural observations were undertaken using EBSD. The experimental investigations showed that after two pass of ECAP, a large amount of subgrains with low angle grain boundaries appears in the original coarse grains. The simulated cell size was in good agreement with the experiment, particularly with the observed rapid decrease of the cell size during the second pass slowing down from the forth pass onwards.
Article: A Novel Robust QCA Full-adder[Show abstract] [Hide abstract]
ABSTRACT: Quantum-Dot Cellular Automata (QCA) as a candidate technology to replace CMOS promises extra low-power, extremely dense and high speed structures at a nano scale. This paper presents a novel robust QCA full-adder based on an efficient five-input majority gate. This design in contrast to its counterparts uses a robust crossover scheme and surpasses the best previous robust designs in terms of area, delay and complexity. Regarding the efficient layout of this component, it is used to design Ripple Carry Adders with different sizes. The simulations of the proposed designs were done using the both coherence and bi-stable simulation engines of QCA designer version 2.0.3 and same results were achieved which indicate the efficiency and robustness of the proposed designs.
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ABSTRACT: In this paper, an experimental study for an eccentrically loaded circular footing, resting on a geogrid reinforced sand bed, is performed. To achieve this aim, the steel model footing of 120 mm in diameter and sand in relative density of 60% are used. Also, the effects of depth of first and second geogrid layers and number of reinforcement layers (1 to 4) on the settlement-load response and tilt of footing under various load eccentricities (0 cm, 0.75 cm, 1.5 cm, 2.25 cm and 3 cm) are investigated. Test results indicate that ultimate bearing capacity increases in comparison with unreinforced condition. It is observed that when the reinforcements are placed in the optimum embedment depth (u/D=0.42 and h/D=0.42), the bearing capacity ratio (BCR) increases with increasing load eccentricity to the core boundary of footing, and that with further increase of load eccentricity, the BCR decreases. Besides, the tilt of footing increases linearly with increasing settlement. Finally, by reinforcing the sand bed, the tilt of footing decreases at 2 layers of reinforcement and then increases by increasing the number of reinforcement layers.
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