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We pay attention to an insulation diagnosis technique of on-line hydrogenerator stator windings. On-line partial discharge monitoring and diagnosis of the insulation of hydrogenerator machines can be expected to reduce their maintenance costs. Therefore, we aim at development of the hybrid diagnostic method that ultrasonic wave signal occurring by partial discharge and leakage current flowing through...
Electronic properties of single-walled carbon nanotubes (SWNTs) filled with Fe nanoparticles are studied by fabricating them as the channels of field-effect transistors (FETs). Our results reveal that Fe-filled SWNTs at low filling levels can exhibit high-performance p-n junction diode behavior. The synthesis of Fe-filled SWNTs is confirmed by transmission electron microscopy (TEM) observation, and...
We report electrical transport properties of resonance tunneling transistors fabricated using C60-filled metallic double-walled carbon nanotubes. All the examined devices exhibit a strong negative differential resistance (NDR) behavior, and the high peak-to-valley current ratios more than 103 are observed at room temperature. More importantly, the observed NDR characteristics remain stable under forward...
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