Papers by Author: Li Wei Huang

Abstract: The low utilization rate of the traditional lighting system lighting and the overall layout and wiring costs high affecting the overall appearance and so many problems. This design of an intelligent lighting control system based on ZigBee technology. Using ZigBee CC2530 of the TI Company, the system researches and designs a sending module and a receiving module of intelligent wireless lighting control system. The ZigBee terminal node sends control signal to the coordinator node. The coordinator node CC2530 output of PWM wave signal according to the control instruction signal. the output of the PWM wave signal controlled the LED brightness through PT4115 chip LED driver circuit. Through tests,the results show that it can meet the demand of daily light regulation.

Abstract: Carbon nanotubes reinforced alumina was fabricated by spark plasma sintering method. When adding 0.2wt% nanotubes, the fracture toughness of the composites prepared increases 19% compared with the pure alumina ceramics. The effect of sintering schedule on microstructure and mechanical properties is investigated systematically. Microstructure studies reveal that at high sintering temperature, the nanotubes tend to gather in the gaps surrounded by three or more grains in a flocculent state, which leads to poor mechanical properties. Raman spectrum indicates that long sintering duration may cause serious nanotubes destruction and lower the mechanical properties.