Chih-Ju Chou

Interactive Relationship between Silver Ions and Silver Nanoparticles with PVA Prepared by the Submerged Arc Discharge Method

This study uses the submerged arc discharge method (SADM) and the concentrated energy of arc to melt silver metal in deionized water (DW) so as to prepare metal fluid with nanoparticles and submicron particles. The process is free from any chemical agent; it is rapid and simple, and rapid and mass production is available (0.5 L/min). Aside from the silver nanoparticle (Ag0), silver ions (Ag+) exist in the colloidal Ag prepared by the system. In the preparation of colloidal Ag, polyvinyl alcohol (PVA) is used as an additive so that the Ag0/Ag+ concentration, arcing rate, peak, and scanning electron microscopic (SEM) images in the cases with and without PVA can be analyzed. The findings show that the Ag0/Ag+ concentration increases with the addition level of PVA, while the nano-Ag and Ag+ electrode arcing rate rises. The UV-Vis absorption peak increases Ag0 absorbance and shifts as the dispersity increases with PVA addition. Lastly, with PVA addition, the proposed method can prepare smaller and more amounts of Ag0 nanoparticles, distributed uniformly. PVA possesses many distinct features such as cladding, dispersion, and stability.

A case study of mechatronics human machine interface technology development research for diesel generator engine power plant

This paper presents the applications of a human machine interface (HMI) system in thermal power plants. its will study remote testing and operation of diesel fuel generators through the principles of normal practice. The control authorizations of a Thermal power plant Mechatronics equipment control system can be divided into three levels. The first level, the local override control. The second level of control is the remote software lock-in control. The third level of control is the remote HMI system. First, each level of control is processed, analyzed, and organized in the Engine Interface Control Unit (EICU). Then, the HMI graphic control system integrates multiple diesel generator engine control units (ECU) PLC systems through data communication. The HMI software and hardware connection uses standard communication protocol, standard data transfer interfaces, and specific driver software. This paper that suggests that a compact and concise system structure can be implemented by the integration of mechatronics devices and information technology. In this way, reliability, maintainability and extensibility can be achieved. Conducive to the integration and compatibility with a variety of Supervisory Control and Data Acquisition (SCADA) system.

Comparison of graphene impregnated with/without nanosilver prepared by submerged arc discharge method:

In this study, submerged arc discharge method (SADM) was used to prepare graphene-nanosilver composites (graphene impregnated with nanosilver) and verified whether it can be prepared under different methods. The optical properties, zeta potentials, and particle sizes of the composites were analyzed through ultraviolet–visible spectroscopy and Zetasizer. The suspensibility of composites were much better than that of noncomposites. Then, we compared the components of composites and noncomposites through transmission electron microscopy. The results confirmed that even when fabricated from similar materials, the composites and noncomposites yielded by SADM featured significantly different properties.

Relationship between Ag nanoparticles and Ag ions prepared by arc discharge method

Abstract This study used the submerged arc discharge method (SADM) to produce metal fluid containing nanoparticles and submicron particles, whereby the energy focused by an electric arc was used to disintegrate silver (Ag) metal in deionized water (DW). No additional chemical substances were required throughout the process, which enabled production to be fast and straightforward. This study proposed using colorimetry to define the interrelation between concentration and nano Ag as well as the Ag ions (Ag+) within a nano silver colloid (NSC) of a specific dilution factor, involving ultraviolet-visible (UV-Vis) spectroscopy and the measuring of electrical conductivity. The results showed that Ag+ activity increased under various dilution conditions, displaying an upward trend in activity with an increase in the dilution factor. The absorption values of Ag+ and nanoparticles increased over time, and the Ag+ activity increased by up to a factor of two after its dilution. Therefore, the Ag+ and nanoparticles demonstrated an interdependence between each other.

Electromagnetic Characteristic Analysis of Circuit Breaker Actuator Using Bond Graph Method

Abstract This study analyzed the characteristics of the electromagnetic actuator in a circuit breaker according to the bond graph method. Such analysis is particularly useful in describing the dynamic hybrid systems of electromagnetic actuators, including the electrical, magnetic, and mechanical fields. The bond graph method provided a way to design and revise a model by observing its energy transference and physical structure. The bond graph method could be converted into a Simulink model in order to compare the measured data with the simulation results. Based on the combined features of hybrid systems from the bond graph method, a magnetic time constant was proposed to provide a design method. The simulation results were similar to the measured data, and two schemes were proposed to improve the speed of an electromagnetic actuator.

Planning and setup of grid-connected photovoltaic generation systems

Solar PV (Photovoltaic, PV) power generation is currently one of the renewable energy with environmental-fashion trends and new alternative-green energy. Taiwan is located in a subtropical zone with sufficient sunshine and abundant solar resource, and thus, has great potential in solar power development. This project sets up a 30.78kWp grid-connected PV array demonstration system on the roof of a mall building in Taiwan. The system configuration follows the present architectural appearance. The mall office roof is configured, and the PV system is monitored by a central monitoring system. The important data are collected, including the generating voltage of solar module and inverter, current, power, working temperature of the thin film solar module, sunshine amount, and atmospheric temperature. The monitoring system has the functions of real-time monitoring data display, historical monitoring data display, and power generation statistics query. This paper proposes the academic theories and application of PV system equipments, as based on practical experience, describes the related operating procedures and methods, and briefly discusses the engineering practice cases regarding the planning, design, and setup of demonstration system. The findings can serve as reference for subsequent project planning and design, supervision and system management, and maintenance.