Browsing by Author "Lu, C. H."

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A Hula-Hoop Energy-Harvesting System
(2011-10-01)
Lu, C. H.
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Wang, Y. J.
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Sung, C. K.
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Chao, Paul C. P.
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影像與生醫光電研究所
This paper proposes a hula-hoop energy-harvesting system that integrates a hula-hoop motion transformer with an electromagnetic generator. The hula-hoop motion transformer converts the linear motion from environment, machinery, or even human body into rotational one under specifically designed dynamic conditions. Then, the system can generate power through electromagnetism after combining the electromagnetic generator with the rotational motion. The equations prescribing the relation between induced voltage and power for the system are derived according to Faraday's theory. Meanwhile, the physical model of energy-harvesting system is established and the governing dynamic equations are derived as well via the Lagrange's equations. Good agreement of induced voltage and power between theoretical and experimental results is obtained. The maximum power that the system can generate is approximately 5 mW when the frequency and amplitude of the external excitation are 8 Hz and 11.2 N, respectively.
EUV continuum from compressed multiple thin plate supercontinuum
(2016)
Huang, P. C.
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Lu, C. H.
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Chen, B. H.
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Yang, S. D.
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Chen, M. -C.
A one-cycle (3.3fs) pulse compressed from multiple thin plates generated supercontinuum has been demonstrated and used to produce a bright EUV continuum covering from 43 to 65 eV with high up-conversion efficiency of 5x10(-5).
Influence of external excitations on ball positioning of an automatic balancer
(2013-11-01)
Sung, C. K.
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Chan, T. C.
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Chao, C. P.
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Lu, C. H.
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電機資訊學士班
This study examined the influence of external excitations on ball positioning in an automatic ball balancer (ABB) installed in a rotor system. The authors' previous studies adopted a model that considered the ABB as an autonomous system by neglecting external excitations. We examined how the magnitude, the frequency and even the phase of an external excitation affected ball positioning. Simulations were performed to predict the ball positions under various external forces. Then, we constructed an experimental rig by employing a shaker to apply excitations to the rotor system and the associated ABB to verify the theoretical development. Simulation results indicated that the balancing balls of the ABB could counterbalance the external force by the change of the ball positions. However, it was observed from the experiment that the ball would not be displaced if the external force was applied after the ball had been positioned because the excessive rolling resistance between the ball and the runway prevented the ball from moving to desired positions. (C) 2013 Elsevier Ltd. All rights reserved.
Study of Crystallinity in mu c-Si: H Films Deposited by Cat-CVD for Thin Film Solar Cell Applications
(2010-01-01)
Hsu, C. H.
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Hsu, Y. P.
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Yao, F. H.
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Huang, Y. T.
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Tsai, C. C.
The crystallinity of the hydrogenated microcrystalline silicon (mu c-Si:H) film was known to influence the solar cell efficiency greatly. Also hydrogen was found to play a critical role in controlling the crystallinity. Instead of employing conventional plasma deposition techniques, this work focused on using catalytic chemical vapor deposition (Cat-CVD) to study the effect of hydrogen dilution and the filament-to-substrate distance on the crystallinity, deposition rate, microstructure factor and electrical property of the mu c-Si: H film. We found that the substrate material and structure can affect the crystallinity of the mu c-Si: H film and the incubation effect. Comparing bare glass, TCO-coated glass, a-Si: H-coated glass and mu c-Si: H-coated glass, the microcrystalline phase grows the fastest onto mu c-Si: H surface, but the slowest onto a-Si: H surface. Surprisingly, the template effect lasted for more than a thousand atomic layers of silicon.