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High-quality Ge epilayer on Si(1 0 0) substrate with an inserted low-temperature Ge seed layer and a thin Si 0.77 Ge 0.23 layer was grown by ultrahigh vacuum chemical vapor deposition. The epitaxial Ge layer with surface root-mean-square roughness of 0.7 nm and threading dislocation density of 5 Â 10 5 cm À2 was obtained. The influence of low temperature Ge(More)
Direct band electroluminescence (EL) from tensile-strained Si 0.13 Ge 0.87 /Ge multiple quantum wells (MQWs) on a Ge virtual substrate (VS) at room temperature is reported herein. Due to the competitive result of quantum confinement Stark effect and bandgap narrowing induced by tensile strain in Ge wells, electroluminescence from Γ1-HH1 transition in 12-nm(More)
Vehicle route scheduling is an important activity in supply chain management. It is virtually a kind of vehicle routing problem with time windows (VRPTW). An improved model of VRPTW with load balancing was built up. It aims to achieve minimum vehicles, the shortest distribution distance, load balancing and customer's time demand. The algorithm was designed(More)
A new extended distribution network model was developed with the aim to minimize the total cost of logistics process from the beginning of supplier, through distribution center, to the end of customer. For the sake of the efficiency of distribution, an assumption that the distribution zone of each distribution center is restricted was specially considered.(More)
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