Yung Ta Institute of Technology and Commerce

Pingtung, Taiwan

Yung Ta Institute of Technology and Commerce

Pingtung, Taiwan
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Hung C.,Yung Ta Institute of Technology and Commerce
Journal of Hazardous, Toxic, and Radioactive Waste | Year: 2011

The behavior of the ammonia (NH3) oxidation was studied by selective catalytic oxidation (SCO) over a Pt-Pd-Rh nanocomposite cordierite catalyst in a tubular fixed-bed flow quartz reactor at temperatures between 423 and 623 K. The catalysts' surface properties were characterized using scanning transmission electron microscopy-energy-dispersive X-ray, optical microscopy, and ultraviolet visible. The experimental results show that high activities for NH3 removal were achieved during catalytic oxidation over the Pt-Pd-Rh cordierite catalyst at 623 K with an oxygen content of 4%. N2 was the main product in the NH3-SCO process over the Pt-Pd-Rh nanocomposite cordierite catalyst. These results also verify the Pt-Pd-Rh metals on cordierite surfaces, resulting in the formation of catalytically active sites at the metal-support interface in the reduction of NH3 in this process. In addition, the Pt-Pd-Rh nanocomposite cordierite-induced cytotoxicity testing was mainly applied to the human lung MRC-5 cell line, and the percentage of cell survival was determined by 3-(4,5-dimethylthiazol-2-yl)-5-(3-carboxymethoxyphenyl)-2-(4-sulfophenyl)-2H-tetrazolium analysis in vitro. For Pt-Pd-Rh nanocomposite cordierite, only minor cytotoxicity was observed when human lung cells were exposed. © 2011 ASCE.


Hung C.-M.,Yung Ta Institute of Technology and Commerce
Powder Technology | Year: 2012

This study elucidates the electrocatalytic oxidation (ECO) of ammonia (NH 3) over a complex PtPdRh nanoparticle electrocatalytic material immersed in a 0.5-M H 2SO 4 solution, where the electrolyte was measured using a linear sweep voltammogram (LSV) technique. The complex PtPdRh nanoparticle electrode was synthesized from H 2PtCl 6, Pd(NO 3) 3 and Rh(NO 3) 3 and deposited on an alumina substrate to improve the NH 3-ECO ability. The experimental data indicate that a high ECO activity was achieved during the catalytic oxidation over the PtPdRh electrocatalytic material when using a high potential sweep rate; the maximum current density reached for the NH 3 oxidation was 0.4mA in the voltage range of 0.1V. Interesting, this LSV oxidation ability may explain the significant activity of the catalyst in an acidic environment. The catalyst structure was characterized by polarization curves, UV-vis, three-dimensional excitation-emission fluorescent matrix (EEFM) spectroscopy and TEM. EEFM was applied to evaluate the fresh catalyst yields for the fluorescent plots of 220/345nm and 210/385nm, and TEM determined the particle size of the nanoparticles and indicated a high dispersion phenomenon had occurred. © 2012 Elsevier B.V.


Wei P.S.,National Sun Yat - sen University | Wu T.H.,Yung Ta Institute of Technology and Commerce
International Journal of Heat and Mass Transfer | Year: 2012

The effects of local electrical contact resistance on transport variables, cooling rate, solute distribution, and nugget shape after solidification responsible for microstructure of the fusion zone during resistance spot welding are realistically and systematically investigated. The model accounts for electromagnetic force, heat generation and contact resistances at the faying surface and electrode-workpiece interfaces and bulk resistance in workpieces. Contact resistances are composed of film and constriction resistances, as functions of hardness, temperature, electrode force and surface condition. The computed results show that the bulk dynamic electrical resistance cannot reliably reflect transport processes and nugget shape, unless the local constriction resistance and electric current density are known. Regardless of high film resistance, nugget growth and transport processes are independent of film resistance due to delayed response time of local electric current in the early stage. A decrease in constriction resistance, however, delays nugget formation, enhances convection and solute mixing, and changes circulation direction of the stronger convection cell during cooling period. © 2012 Elsevier Ltd. All rights reserved.


This work describes the oxidation of ammonia (NH3) at temperatures between 423 and 673K by selective catalytic oxidation (SCO) over a Pt-Rh nanocomposite catalyst that was prepared by the co-precipitation of H2PtCl6 and Rh(NO3)3 in a tubular fixed-bed flow quartz reactor (TFBR). The catalysts were characterized using TEM, XRD, PSA, and CV. The experimental results reveal that at a temperature of 673K and an oxygen content of 4%, approximately 98% of the NH3 was removed by catalytic oxidation over the Pt-Rh nanocomposite catalyst. N2 was the main product of the NH3-SCO process. The Pt-Rh nanocomposite-induced cytotoxicity to the human lung cell line, MRC-5, was tested, and cell survival was determined using 3-(4,5-dimethylthiazol-2-yl)-5-(3-carboxymethoxyphenyl)-2-(4-sulfophenyl)-2H-tetra-zolium (MTS) analysis in vitro. These results demonstrated that the Pt-Rh nanocomposite catalyst is only weakly cytotoxic to human lung cells. © 2011 Elsevier B.V.


Liang J.S.,Yung Ta Institute of Technology and Commerce
Computers in Industry | Year: 2010

This study describes the generation of Web-based troubleshooting system for automotive refrigeration system using knowledge engineering approach over the Internet. The relevant technologies used in the system are discussed in detail. The aim of the proposed knowledge-based troubleshooting system (KBTS) is to integrate the troubleshooting process of automotive refrigeration system into a single architecture for retrieving knowledge and experience of technicians in automobile repairing field. The application of KBTS guides the novice or learner through different stages of the troubleshooting process enabling the creation of problem-solving list, its contents include the selection of hand tools and instrument, decision of detecting methods, procedure of disassembling/reassembling component, adjusting, and so on. Through the use of web and knowledge approach, the troubleshooting knowledge of automobile refrigeration system can be effectively incorporated into the procedure generation framework and a Web-based troubleshooting procedure generation system can also be implemented. © 2009 Elsevier B.V. All rights reserved.


Hung C.-M.,Yung Ta Institute of Technology and Commerce
International Journal of Hydrogen Energy | Year: 2012

The study of the electrochemical oxidation (ECO) of ammonia (NH 3) is becoming increasingly an important issue in environmental electrochemistry. For this investigation of platinum-containing electrode material was synthesized by coprecipitating H 2PtCl 6, Pd(NO 3) 3 and Rh(NO 3) 3 and employed as a typical electrocatalytic reaction such as NH 3-ECO for fuel cell application. In this study, ECO ability immersed in a 0.5 M H 2SO 4 solution, where the electrolyte was measured using an electrochemical cyclic voltammetry (CV) technique. Furthermore, the electrocatalytic materials were analyzed by UV-Vis absorption spectra, excitation-emission fluorescent matrix (EEFM) spectroscopy, and zeta potential. Preliminary experimental results showed that the activity of the PtPdRh alloy catalysts using a high potential scan rate; the maximum current density reached for the NH 3-ECO in the voltage range of 0.2 V. Additionally, EEFM was applied to evaluate the freshly prepared catalyst yields for the fluorescent peak at 300/400 nm is associated with the Pt clusters, and UV-Vis absorption spectra revealed that the platinum (IV) species were observed at about 350 nm. Graphical abstract: The cyclic voltammetry (CV) display the activity of the PtPdRh alloy catalysts using a high potential scan rate; the maximum current density reached for the NH 3 reaction in the voltage range of 0.2 V. Furthermore, this reaction ability may explain the dehydrogenation for the ammonia oxidation because of the electrochemical surface active catalytic sites that were not enough formed. Highlights: The electrocatalytic oxidation of ammonia over a PtPdRh electrocatalytic material. The electrocatalytic material exhibits significant activity in an acidic environment. EEFM was applied to evaluate the material yields for the fluorescent. © 2012 Hydrogen Energy Publications, LLC.


Hung C.-M.,Yung Ta Institute of Technology and Commerce
Powder Technology | Year: 2010

This study elucidates ammonia (NH3) oxidation by selective catalytic oxidation (SCO) over a Pt-Pd-Rh ternary composite cordierite substrate catalyst in a tubular fixed-bed flow quartz reactor (TFBR) at temperatures of 423-623K. A Pt-Pd-Rh ternary composite cordierite substrate catalyst was prepared by incipient wetness impregnation with aqueous solutions of H2PtCl6, Pd(NO3)3 and Rh(NO3)3 that were coated on cordierite ceramic honeycomb substances. Experimental data indicate that high NH3 reduction activity was achieved during catalytic oxidation over the Pt-Pd-Rh cordierite substrate catalyst at 623K with an oxygen content of 4%. Notably, N2 was the predominant product of the NH3-SCO process over the Pt-Pd-Rh cordierite substrate catalyst. These experimental results also confirm that an initial high concentration of NH3 influent decreases ammonia removal efficiency. Further, catalysts were characterized by SEM, TGA-DTA, FTIR and TEM. Analytical results indicate that catalytic behavior is associated with the Pt-Pd-Rh ternary composite and cordierite ceramic honeycomb substrate. © 2010 Elsevier B.V.


Hung C.-M.,Yung Ta Institute of Technology and Commerce
Journal of Hazardous Materials | Year: 2010

This work considers the oxidation of ammonia (NH3) by selective catalytic oxidation (SCO) over a Pt-Pd-Rh cordierite monolith catalyst in a tubular fixed-bed flow quartz reactor (TFBR) at temperatures between 423 and 623K. A Pt-Pd-Rh cordierite monolith catalyst was prepared by incipient wetness impregnation with aqueous solutions of H2PtCl6, Pd(NO3)3 and Rh(NO3)3 that were coated on cordierite substances. The catalysts were characterized using XRD, PSA and SEM. The experimental results show that around 99.0% NH3 removal was achieved during catalytic oxidation over the Pt-Pd-Rh cordierite monolith catalyst at 623K with oxygen content of 4%. N2 was the main product in the NH3-SCO process over the Pt-Pd-Rh cordierite monolith catalyst. These results also verify that the Pt-Pd-Rh metals on cordierite monolith surfaces, resulting in the formation of catalytically active sites at the metal-support interface in the reduction of NH3 in the process. © 2010 Elsevier B.V.


Liang J.S.,Yung Ta Institute of Technology and Commerce
International Journal of Advanced Manufacturing Technology | Year: 2010

In this paper, several web-based interfaces for user interaction and a task-oriented decision approach are proposed to build a tasks schedule model and then display the manufacturing process in a virtual environment, which is created by a geometric virtual-reality-based visualization technology for screw threads generation. The proposed tasks schedule model consists of four types of objects: virtual component, state manager, transfer operator, and flow controller. The virtual component has a geometric model with kinematics and their attributes. To control the geometric model, a component controller which models the logical aspects of a component is used. The component controller should be able to implement component-level orders by operating the geometric model. For the fidelity of the tasks schedule model, a transfer operator has a set of component-level command imitating the physical mechanism of a transfer. As a result, more accurate simulation results can be expected. The flow controller makes decisions on friable transfers based on decision parameters, which are maintained by the state manager. To have better structure and easier implementation, a virtual manufacturing platform can be modeled in a hierarchical and modular manner as an integrated system consisting of a product design suite, a web interface module, and a visualization module. Meanwhile, it provides a solution of learning of manufacturing sequences, cost effective, platform independent, and sharing visualized information over the internet for virtual manufacturing. Finally, the tasks schedule model has been implemented with an example in screw threads generation. © 2009 Springer-Verlag London Limited.


Jean M.-D.,Yung Ta Institute of Technology and Commerce
International Journal of Engineering Education | Year: 2014

This paper proposes a sputtered deposition-based technology to develop a nanotechnology project into a laboratory activity. This technology can make nanotechnology more appealing to students by enhancing the attractiveness of engineering curricula. In laboratory activity, nanotechnology courses using a laboratory platform and physical vapor deposition implemented nanotechnology exploration projects enhance interest and offer sufficient knowledge to students. Such courses can help students to understand nanotechnology concepts and the applications of sputtered deposition-based systems. This nanotechnology exploration project in the form of a laboratory activity has been evaluated successfully based on the evaluation results and responses to questionnaires: students and experts rated the nanotechnology laboratory activity highly, with mean values of 4.093 and 4.263, respectively. As for the Cronbach's alpha coefficient of the nanotechnology laboratory activity, questionnaire results showed that the satisfaction levels of experts and students in this study were 0.953 and 0.947, respectively. These results demonstrate the excellent reliability of the survey's internal consistency. Furthermore, more than 78.34% of the students, those with scores over 80, found the laboratory activity learning in the nanotechnology exploration project to be very good or excellent. Moreover, the students obtained very good academic results.

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