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—Recent studies have been conducted to indicate the ineffective usage of licensed bands due to the static spectrum allocation. In order to improve the spectrum utilization, the cognitive radio (CR) is therefore suggested to dynamically exploit the opportunistic primary frequency spectrums. How to provide efficient spectrum handoff has been considered a(More)
This paper proposes the design and implementation of a field-programmable gate array (FPGA)-based drive system for a rotor flux oriented vector-controlled induction motor drive. The system is realized by using FPGA (XC2V250) from Xilinx and its related hardware circuit. A vector oriented control structure using integer arithmetic has been developed for the(More)
OBJECTIVE To explore the influences of age, gender and season on serum thyroid stimulating hormone level and thyroid hormone level in healthy people. METHODS There were 2 564 healthy volunteers enrolled in this study, whom were divided into different groups according to gender, age and the season. The levels of serum TSH, T3, T4, FT3, FT4 were measured(More)
Polyaniline(PAni) was prapared by an in situ polymerization in aqueous solution, and PAni/ZnO composite was synthesized by mechanical method. The composite was characterized using X-ray diffraction (XRD), Ultraviolet-visible spectrometer (UV-vis) and Scanning electron microscope (SEM). The results of XRD confirm the formation of PAni and PAni/ZnO composite.(More)
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