Browsing by Author "Tsai, ML"

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Characteristics and stress-induced degradation of laser-activated low temperature polycrystalline silicon thin-film transistors
(2003-02-15)
Peng, DZ
;
Chang, TC
;
Chang, CY
;
Tsai, ML
;
Tu, CH
The characteristics and reliability of laser-activated polycrystalline silicon thin-film transistors (poly-Si TFTs) under the stress condition of drain voltage (V-d)=12 V and gate voltage (V-g)=15 V have been investigated. In spite of reducing the source/drain resistivity by using laser activation method, the leakage current (V-g<0) is larger for laser-activated poly-Si TFTs in comparison with traditional furnace-activated counterparts. It is also found that the post-stress leakage and on/off current ratio degrade much faster for laser-activated poly-Si TFTs, while the degradation rates of threshold voltage and subthreshold swing are comparable to those of traditional furnace-activated TFTs. The laser activation modifies the grain structure between drain and channel region and causes grain discontinuity extending from the drain side to the channel region. The grain discontinuity near drain side in the polysilicon film has been investigated by transmission electron microscopy analysis. The effective trap state density calculated from typical I-V curve has been compared for laser-activated and furnace-activated TFTs. As a result, an inferior reliability with extra trap state density and larger leakage current was observed in the laser-activated poly-Si TFTs. (C) 2003 American Institute of Physics.
Effect of filtration velocity and filtration pressure drop on the bag-cleaning performance of a pulse-jet baghouse
(1999)
Tsai, CJ
;
Tsai, ML
;
Lu, HC
;
環境工程研究所
;
Institute of Environmental Engineering
In this study the filtration velocity and filtration pressure drop at the beginning of bag cleaning were used as experimental parameters to evaluate the bag-cleaning performance of a pulse-jet baghouse. The effective residual pressure loss was used to indicate the cleaning performance after bag cleaning. Two different test dusts, fly ash and limestone, were used. The critical cleaning indices under different operation conditions for bag cleaning were also investigated. A critical average pulse overpressure was found to exist beyond which bag-cleaning performance did not improve much. It was found the filter's final filtration resistance is an important parameter to decide whether a Venturi is necessary for a good bag-cleaning performance or not. Use of a Venturi was found to increase the average pulse overpressure for a system with a filter's final resistance coefficient greater than about 500 Pa.s/cm. However, no Venturi is recommended when the filter's final resistance coefficient is smaller than 500 Pa.s/cm.
Effect of filtration velocity and filtration pressure drop on the bag-cleaning performance of a pulse-jet baghouse
(2000)
Tsai, CJ
;
Tsai, ML
;
Lu, HC
;
環境工程研究所
;
Institute of Environmental Engineering
In this study the filtration velocity and filtration pressure drop at the beginning of bag cleaning were used as experimental parameters to evaluate the bag-cleaning performance of a pulse-jet baghouse. The effective residual pressure loss was used to indicate the cleaning performance after bag cleaning. Two different test dusts, fly ash and limestone, were used. The critical cleaning indices under different operation conditions for bag cleaning were also investigated. A critical average pulse overpressure was found to exist beyond which bag-cleaning performance did not improve much. It was found the filter's final filtration resistance is an important parameter to decide whether a Venturi is necessary for a good bag-cleaning performance or not. Use of a Venturi was found to increase the average pulse overpressure for a system with a filter's final resistance coefficient greater than about 500 Pa.s/cm. However, no Venturi is recommended when the filter's final resistance coefficient is smaller than 500 Pa.s/cm.