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Transition rules and optical properties of armchair graphene nanoribbons embedded in hexagonal boron nitride lattices are studied for the first time. Based on tight binding calculations considering first and second nearest neighbors, we show that the optical transition rules of such structures are completely different from that of conventional graphene nanoribbons. These rules are explained by the symmetry properties of the subband wave functions. The optical spectrum, the quantum efficiency, and the photoresponsivity of different nanoribbons are evaluated and their application in photodetector devices is investigated. The results are verified with first principles calculations.

In this study two‐dimensional finite element model of Al/SiC metal matrix composites (MMC) are investigated by the use of ABAQUS/Explicit software. Chip formations and machining forces during machining of MMC have been studied and compared to experimental data. It was found that the resulted chips in simulation and the generated chips in experiments both have saw‐tooth in appearance. On the other hand, the obtained cutting forces diagrams from simulation and experimental conditions have considerable fluctuating with passing cutting time. This is due to the interaction between tool and SiC particles during chip formation.

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