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RISS 인기검색어
- 검색키워드
- 저자 : F. Goudarzi (검색결과 4 건)
- 무료
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- 유료
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A novel single wall carbon nanotubes-based sensor doped with lithium for ammonia gas detection
F. Goudarzi 한양대학교 세라믹연구소 2012 Journal of Ceramic Processing Research Vol.13 No.5
To deposit SWCNTs (single wall carbon nanotubes) on substrates and evaluate their gas sensing properties, a pair of interdigitated electrodes was made by sputtering Au on Si/SiO2. SWCNTs were first doped with lithium by heating with LiNO3 and HNO3 for 12 h. Then SWCNTs-lithium doped was well-dispersed in dimethylformamide (DMF). By using electrophoresis and applying a DC voltage, the SWCNTs were forced to deposit between the two electrodes. The deposited SWCNT on the electrodes were heat treated at 350 ο C for 5 h. with Ar to eliminate the DMF adsorbed layer. The electrical response of this sensor has been measured by exposing the films to NH3 (500 ppm) at different operating temperatures between 25 ο C to 280 ο C. The response to NH3 has been found to be a maximum at around 150 ο C and a high sensitivity of 34% was achieved.
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Zhu, W.D.,Goudarzi, N.,Wang, X.F.,Kendrick, P. Techno-Press 2018 Smart Structures and Systems, An International Jou Vol.22 No.2
A variable electromotive-force generator (VEG), which is a modified generator with an adjustable overlap between the rotor and the stator, is proposed to expand the operational range of a regular generator through a simple and robust active control strategy. It has a broad range of applications in hybrid vehicles, wind turbines, water turbines, and similar technologies. A mathematical model of the VEG is developed, and a novel prototype is designed and fabricated. The performance of the VEG with an active control system, which adjusts the overlap ratio based on the desired output power at different rotor speeds for a specific application, is theoretically and experimentally studied. The results show that reducing the overlap between the rotor and the stator of the generator results in reduced torque loss of the generator and an increased rotational speed of the generator rotor. A VEG can improve the fuel efficiency of hybrid vehicles; it can also expand operational ranges of wind turbines and water turbines and harness more power.
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W.D. Zhu,N. Goudarzi,X.F. Wang,P. Kendrick 국제구조공학회 2018 Smart Structures and Systems, An International Jou Vol.22 No.2
A variable electromotive-force generator (VEG), which is a modified generator with an adjustable overlap between the rotor and the stator, is proposed to expand the operational range of a regular generator through a simple and robust active control strategy. It has a broad range of applications in hybrid vehicles, wind turbines, water turbines, and similar technologies. A mathematical model of the VEG is developed, and a novel prototype is designed and fabricated. The performance of the VEG with an active control system, which adjusts the overlap ratio based on the desired output power at different rotor speeds for a specific application, is theoretically and experimentally studied. The results show that reducing the overlap between the rotor and the stator of the generator results in reduced torque loss of the generator and an increased rotational speed of the generator rotor. A VEG can improve the fuel efficiency of hybrid vehicles; it can also expand operational ranges of wind turbines and water turbines and harness more power.
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Adopting flexibility of the end-plate connections in steel moment frames
M. Ghassemieh,M. Baei,A. Kari,A. Goudarzi,D.F. Laefer 국제구조공학회 2015 Steel and Composite Structures, An International J Vol.18 No.5
The majority of connections in moment resisting frames are considered as being fully-rigid. Consequently, the real behavior of the connection, which has some level of flexibility, is ignored. This may result in inaccurate predictions of structural response. This study investigates the influence of flexibility of the extended end-plate connections in the steel moment frames. This is done at two levels. First, the actual micro-behavior of extended end-plate moment connections is explored with respect to joint flexibility. Then, the macro-behavior of frames with end-plate moment connections is investigated using modal, nonlinear static pushover and incremental dynamic analyses. In all models, the P-Delta effects along with material and geometrical nonlinearities were included in the analyses. Results revealed considerable differences between the behavior of the structural frame with connections modeled as fully-rigid versus those when flexibility was incorporated, specifically difference occurred in the natural periods, strength, and maximum inter-story drift angle.
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