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This paper analyzes the position estimation capability on the saliency-based positon sensorless drive of permanent magnet (PM) machine. To obtain the rotor position information, high frequency (HF) voltage is persistently injected to provide the measurable spatial saliency signal. Although many saliency-based sensorless drives have demonstrated the comparable performance with low-end encoder-based...
The thickness effect of In-Ga-Zn oxide (IGZO) semiconductor layer is investigated for pH sensing in light-addressable potentiometric sensor (LAPS). pH sensing membrane is 45 nm-thick NbOx, which is directly on IGZO/ITO/glass substrate. The thickness of IGZO layer is determined by time-mode control in reactive rf sputtering. The highest photovoltage and operation frequency can be obtained in the IGZO...
A 50 nm-thick TiN sensing membrane with nitrogen (N2) ratio modification was firstly used in EGFET for pH sensing. The highest pH sensitivity of 61 mV/pH with linearity of 99.9% could be found in N2 to N2+Ar ratio of 20%. Similar performance could be maintained at least for 250 days. With additional PVC selective membrane of K+ ionophore, sensitivity could be increased to 48.7mV/pK. This developed...
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