Browsing by Author "Chen, S-H"

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Effect of plasma chemistry on the simulation of helium atmospheric-pressure plasmas
(2011-01-01)
Chiu, Y-M
;
Hung, C-T
;
Hwang, F-N
;
Chiang, M-H
;
Wu, J. -S
The effect on the selection of different plasma chemistries for simulating a typical dielectric barrier discharge (DBD) driven by quasi-pulsed power source (20 kHz) is investigated The numerical simulation was performed by using the one-dimensional self-consistent fluid modeling solver Our simulation result indicates that the computed temporal current density can be significantly improved by using a complex version of plasma chemistry module rather than the simple one and demonstrates an excellent agreement with the experimental data The result suggests the metastable excited and ionic helium related reaction channels which are important in simulating a DBD should be taken into account Furthermore it also reveals that the power absorption of ions is considerably higher than that of the electron (C) 2010 Elsevier B V All rights reserved
Effects of Oxygen Addition and Treating Distance on Surface Cleaning of ITO Glass by a Non-Equilibrium Nitrogen Atmospheric-Pressure Plasma Jet
(2010-10-01)
Chiang, M-H
;
Liao, K-C
;
Lin, I-M
;
Lu, C-C
;
Huang, H-Y
Effects of oxygen addition and treating distance on cleaning organic contaminants on stationary and non-stationary (1-9 cm/s) ITO glass surfaces by a parallel-plate nitrogen-based dielectric barrier discharge (DBD) are investigated experimentally; the DBD is driven by a 60 kHz bipolar quasi-pulsed power source. The results show that two regimes of favorable operating condition for improving the hydrophilic property of the surface (reducing the contact angle from 84 degrees to 25-30 degrees) are found. The measured spatial distribution of NO-gamma UV emission, O(3) concentration and OES spectra are shown to strongly correlate with the measured hydrophilic property. At the near jet downstream locations (z < 10 mm), the metastable N(2)(A(3)Sigma(+)(mu)) and photo-induced dissociation of ozone play dominant roles in cleaning the ITO glass surface; while at the far jet downstream locations (z > 10 mm), where the ratio of oxygen to nitrogen is lower, only the long-lived metastable N(2)(A(3)Sigma(+)(mu) ) plays a major role in cleaning the ITO glass surface.
Effects of Oxygen Addition and Treating Distance on Surface Cleaning of ITO Glass by a Non-Equilibrium Nitrogen Atmospheric-Pressure Plasma Jet
(2010-10-01)
Chiang, M-H
;
Liao, K-C
;
Lin, I-M
;
Lu, C-C
;
Huang, H-Y
Effects of oxygen addition and treating distance on cleaning organic contaminants on stationary and non-stationary (1-9 cm/s) ITO glass surfaces by a parallel-plate nitrogen-based dielectric barrier discharge (DBD) are investigated experimentally; the DBD is driven by a 60 kHz bipolar quasi-pulsed power source. The results show that two regimes of favorable operating condition for improving the hydrophilic property of the surface (reducing the contact angle from 84 degrees to 25-30 degrees) are found. The measured spatial distribution of NO-gamma UV emission, O(3) concentration and OES spectra are shown to strongly correlate with the measured hydrophilic property. At the near jet downstream locations (z < 10 mm), the metastable N(2)(A(3)Sigma(+)(mu)) and photo-induced dissociation of ozone play dominant roles in cleaning the ITO glass surface; while at the far jet downstream locations (z > 10 mm), where the ratio of oxygen to nitrogen is lower, only the long-lived metastable N(2)(A(3)Sigma(+)(mu) ) plays a major role in cleaning the ITO glass surface.
Load- and displacement-controlled finite element analyses on fusion and non-fusion spinal implants
(2009-02-01)
Zhong, Z-C
;
Chen, S-H
;
Hung, C-H
;
機械工程學系
;
Department of Mechanical Engineering
This study used finite element (FE) analysis with the load-controlled method (LCM) and the displacement-controlled method (DCM) to examine motion differences at the implant level and adjacent levels between fusion and non-fusion implants. A validated three-dimensional intact (INT) L1-L5 FE model was used. At the L3-L4 level, the INT model was modified to surgery models, including the artificial disc replacement (ADR) of ProDisc II, and the anterior lumbar interbody fusion (ALIF) cage with pedicle screw fixation. The LCM imposed 10 N m moments of four physiological motions and a 150 N preload at the top of LI. The DCM process was in accordance with the hybrid testing protocol. The average percentage changes in the range of motion (ROM) for whole non-operated levels were used to predict adjacent level effects (ALE%). At the implant level, the ALIF model showed similar stability with both control methods. The ADR model using the LCM had a higher ROM than the model using the DCM, especially in extension and torsion. At the adjacent levels, the ALIF model increased ALE% (at least 17 per cent) using the DCM compared with the LCM. The ADR model had an ALE% close to that of the INT model, using the LCM (average within 6 per cent), while the ALE% decreased when using the DCM. The study suggests that both control methods can be adopted to predict the fusion model at the implant level, and similar stabilization characteristics can be found. The LCM will emphasize the effects of the non-fusion implants. The DCM was more clinically relevant in evaluating the fusion model at the adjacent levels. In conclusion, both the LCM and the DCM should be considered in numerical simulations to obtain more realistic data in spinal implant biomechanics.