Browsing by Author "Chen, Ting-Yu"

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Characteristic V-Mn conversion coating in reinforcing corrosion resistance of electroless Ni-P coated LZ91 Mg alloy
(2020-07-25)
Jian, Shun-Yi
;
Chang, Jun-Kai
;
Lin, Kung-Feng
;
Chen, Ting-Yu
;
Yuan, Jui-Hung
A V-Mn conversion coating was studied and furthermore employed to improve the corrosion resistance of electroless Ni-P coated LZ91 Mg alloy. A thin, continuous and compact V-Mn conversion coating was formed on LZ91 after the immersion of 60 s in the conversion coating solution. The results of electrochemical impedance spectroscopy (EIS) and salt spray test (SST) showed the enhanced corrosion resistance of LZ91. The impedance in EIS increased from 573 Omega.cm(2) to 11,319 Omega.cm(2), and moreover the deteriorated area ratio of the V-Mn conversion coated LZ91 decreased to < 5% after 120 h of SST exposures. Further study of a V-Mn conversion coating/electroless Ni-P composite coated LZ91 was used to investigate the improvement of the corrosion resistance in the electroless Ni-P coated LZ91. The composite coated LZ91 demonstrated better corrosion resistance of mere electroless Ni-P coated LZ91. Furthermore, the corrosion resistance of the composite coated LZ91 was greatly enhanced. The impedance of the composite coated LZ91 was 500 Omega.cm(2), larger than that of the electroless Ni-P coating of 5 Omega.cm(2). The composite coated LZ91 showed better corrosion resistance in the SST exposures in comparison to mere electroless Ni-P coated LZ91. The composite coating indicated that the positive characteristics of a V-Mn conversion coating usefully enhanced the corrosion resistance electroless Ni-P coated LZ91. Moreover, based on the above results, a mechanism for the conversion coating and corrosion resistance was proposed.
Digital Artwork Creation Using Water and Sand on a Two-Dimensional Surface
(2015)
Chen, Ting-Yu
;
Wong, Sai-Keung
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交大名義發表
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National Chiao Tung University
In this paper, we developed a system which enables users to draw pictures of sand and water on a two-dimensional surface in a virtual environment. By mixing water and sand for artwork creation, we can create different styles of pictures. Our system has three major subsystems: water animation system, sand animation system and rendering system. In the simulation part, we compute the motion of sand and water based on the interactions for water-water, sand-water and sand-sand. In the rendering part, we attempt to balance the rendering quality and the computation cost. We render water using a ray tracing method and the sand is rendered with shadow. Thus, the rendered results of water and sand look like 2.5D. We tested our system and the experimental results showed that the users could create a variety of pictures of sand and water.
Dynamics of the reaction CH2I + O(2)probedviainfrared emission of CO, CO2, OH and H2CO
(2020-08-21)
Chen, Ting-Yu
;
Lee, Yuan-Pern
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交大名義發表
;
應用化學系
;
應用化學系分子科學碩博班
The reaction CH2I + O(2)has been widely employed recently for the production of the simplest Criegee intermediate CH2OO in laboratories, but the detailed dynamics of this reaction have been little explored. Infrared emission of several products of this reaction, initiated on irradiation of CH(2)I(2)and O-2(similar to 8 Torr) in a flowing mixture at 308 or 248 nm, was recorded with a step-scan Fourier-transform spectrometer; possible routes of formation were identified according to the observed vibrational distribution of products and published theoretical potential-energy schemes. Upon irradiation at 308 nm, Boltzmann distributions of CO (v <= 5,J <= 19) with an average vibrational energy of 32 +/- 3 kJ mol(-1)and OH (v <= 3,J <= 5.5) with an average vibrational energy of 29 +/- 4 kJ mol(-1)were observed and assigned to the decomposition of HCOOH* to form CO + H2O and OH + HCO, respectively. The broadband emission of CO(2)was simulated with two vibrational distributions of average energies (91 +/- 4) and (147 +/- 8) kJ mol(-1)and assigned to be produced from the decomposition of HCOOH* and methylene bis(oxy), respectively. Upon irradiation of samples at 248 nm, the emission of OH and CO(2)showed similar distributions with slightly greater energies, but the distribution of CO (v <= 11,J <= 19) became bimodal with average vibrational energies of (23 +/- 4) and (107 +/- 29) kJ mol(-1), and branching (56 +/- 5) : (44 +/- 5). The additional large-vcomponent is assigned to be produced from a secondary reaction HCO + O(2)to form CO + HO2; HCO is a coproduct of OH. The branching between CO and OH is (50 +/- 5) : (50 +/- 5) at 308 nm and (64 +/- 5) : (36 +/- 4) at 248 nm, consistent with the mechanism according to which an additional channel to produce CO opens at 248 nm. Highly internally excited H2CO was also observed. With O(2)at 16 Torr, the extrapolated nascent internal distributions are similar to those with O(2)at 8 Torr except for a slight quenching effect.
Interactive Sand Art Drawing Using RGB-D Sensor
(2018-05-01)
Wong, Sai-Keung
;
Chen, Kai-Min
;
Chen, Ting-Yu
;
資訊工程學系
;
Department of Computer Science
We present an interactive system using one RGB-D sensor, which allows a user to use bare hands to perform sand drawing. Our system supports the common sand drawing functions, such as sand erosion, sand spilling, and sand leaking. To use hands to manipulate the virtual sand, we design four key hand gestures. The idea is that the gesture of one hand controls the drawing actions. The motion and gesture of the other hand control the drawing positions. There are three major steps. First, our system adopts a vision-based bare-hand detection method which computes the hand position and recognizes the hand gestures. Second, the drawing positions and the drawing actions are sent to a sand drawing subsystem. Finally, the subsystem performs the sand drawing actions. Experimental results show that our system enables users to draw a rich variety of sand pictures.