Ming Chi University of Technology | Date: 2015-12-02
The invention provides a process for manufacturing nickel oxide films with high conductivity, comprising steps of: operating a high power impulse magnetron sputtering system, HIPIMS system, in an argon and oxygen mixture, at peak power density higher than 1000 W/cm^(2 )under a low duty cycle; and sputtering a Ni target to form the p-type NiO film with high conductivity on a substrate, the duty cycle=t_(on)/(t_(on)+t_(off)), wherein t_(on )is time of pulse on and t_(off )is time of pulse off.
National Taiwan University Hospital and Ming Chi University of Technology | Date: 2014-11-01
A manual jaw opening device with force acting on molars includes: a manual pivotal rotating device; and a pair of opening arms, respectively formed with a first end and a second end, wherein the first end is connected to the manual pivotal rotating device and the second end is equipped with a molar engaging seat; when the pair of opening arms are disposed in the mouth of a patient and the two molar engaging seats are respectively abutted against plural upper molars and plural lower molars, an operator is able to separate the pair of opening arms through operating the manual pivotal rotating device thereby allowing the mouth to be opened.
Su C.-H.,Ming Chi University of Technology
Bioresource Technology | Year: 2013
The catalytic performance and recoverability of several homogeneous acid catalysts (hydrochloric, sulfuric, and nitric acids) for the esterification of enzyme-hydrolyzed free fatty acid (FFA) and methanol were studied. Although all tested catalysts drove the reaction to a high yield, hydrochloric acid was the only catalyst that could be considerably recovered and reused. The kinetics of the esterification reaction catalyzed by hydrochloric acid was investigated under varying catalyst loading (0.1-1M), reaction temperature (303-343K), and methanol/FFA molar ratio (1:1-20:1). In addition, a pseudo-homogeneous kinetic model incorporating the above factors was developed. A good agreement (r2=0.98) between the experimental and calculated data was obtained, thus proving the reliability of the model. Furthermore, the reusability of hydrochloric acid in FFA esterification can be predicted by the developed model. The recoverable hydrochloric acid achieved high yields of FFA esterification within five times of reuse. © 2012 Elsevier Ltd.
Liou T.-H.,Ming Chi University of Technology
Chemical Engineering Journal | Year: 2010
This paper reports the preparation of activated carbon from two different types of agricultural biomass materials, sugar cane bagasse and sunflower seed hull, by phosphoric acid and zinc chloride activation. The experiments in this study vary the pre- and post-treatment procedures, the impregnation ratio of the activating agent, and the carbonization temperature. In recent years, the high surface area and high mesopore proportion of carbon have attracted a lot of attention for potential applications in the green resources such as hydrogen energy storage and carbon dioxide capture. However, the traditional methods for fabricating activated carbon produce a mainly microporous structure. The experimental results show that the activated carbon produced by base-leaching has a mostly mesoporous structure, which effectively enhances its adsorption capacity. The carbon materials obtained from zinc chloride activation of both sugar cane bagasse and sunflower seed hull have mesopore volumes as high as 1.07 and 0.95 cm3/g, and mesopore contents of 81.2 and 74.0%, respectively. The surface area and pore volume of carbon produced using zinc chloride activation were higher than that produced using phosphoric acid activation. The total activation process of bagasse and hull occurs in three reaction stages. This study also presents a corresponding pyrolysis mechanism that agrees well with the experimental results. The proposed method of preparing mesoporous activated carbon is not complicated, and is suitable to bulk production. © 2009 Elsevier B.V. All rights reserved.
Wang S.-K.,Ming Chi University of Technology
IEEE Transactions on Power Systems | Year: 2013
This paper proposes a novel objective function and algorithm to obtain a set of optimal power system stabilizer (PSS) parameters that include a feedback signal of a remote machine and local and remote input signal ratios for each machine in a multi-machine power system under various operating conditions. A novel function called the damping scale is proposed and formulated as an objective function to increase system damping after the system undergoes a disturbance. Three existing objective functions of the damping factor, damping ratio, and a combination of the damping factor and damping ratio were analyzed and compared with the proposed objective function. A novel algorithm called gradual self-tuning hybrid differential evolution (GSTHDE) was developed for rapid and efficient searching of an optimal set of PSS parameters. GSTHDE uses the gradual search concept on STHDE to enhance the probability of searching for an optimal solution. Eigenvalue analysis and nonlinear time domain simulation results demonstrated the effectiveness of the proposed objective function and algorithm. © 1969-2012 IEEE.
Su C.-H.,Ming Chi University of Technology
Applied Energy | Year: 2013
Several homogeneous acid catalysts (nitric, sulfuric, and hydrochloric acids), were selected to investigate their recoverability and reusability for esterifying enzyme-hydrolyzed FFAs and methanol to produce biodiesel. Although all of the three catalysts drove the reaction at high yield, hydrochloric acid is the only recoverable and reusable catalyst, as indicated by partitioning data. Hence, esterifying FFAs and methanol was catalyzed using hydrochloric acid; and the reaction conversion, which was affected by the reaction conditions, was optimized using response surface methodology. A maximal reaction conversion of 98.19% was obtained at 76.67. °C, at a methanol/FFAs molar ratio of 7.92, a catalyst concentration of 0.54. M, and after a reaction time of 103.57. min. The catalyst could be reused at least five times to drive the reaction to a conversion of 97%. This study demonstrated that recoverable and reusable hydrochloric acid is promising for potential applications, including biodiesel production. © 2012 Elsevier Ltd.
Ming Chi University of Technology | Date: 2014-12-22
This invention discloses a hard magnetic alloy thin film used in a high density perpendicular magnetic recording medium. This film incorporates a glass substrate and a ferromagnetic layer formed on the glass substrate. The ferromagnetic layer is deposited onto the substrate using a sputtering deposition and an annealing. After annealing, a single-layered ferromagnetic film with high perpendicular magnetic anisotropy is achieved.
Ming Chi University of Technology | Date: 2014-11-20
One object of the present invention is to provide a headlight control system. The headlight control system is configured to be used with a headlight of a vehicle. The headlight control system includes a first light sensor, a microcontroller, a first driving motor, a power module and an optical lens module. The optical lens module is disposed in front of the headlight in order to receive illumination of the headlight. The microcontroller is electrically connected to the first light source sensor and configured to receive a signal transmitted by the first light sensor. The first driving motor is electrically connected to the microcontroller. The first driving motor is configured to follow an instruction from the microcontroller to drive a first driving mechanism. The first driving mechanism is configured to adjust the optical lens module upon being driven by the first driving motor. The power module is electrically connected to the microcontroller and the headlight. The power module is configured to follow an instruction from the microcontroller to supply the power to the headlight.
Ming Chi University of Technology | Date: 2015-05-13
An endodontic file with improved fatigue resistance comprising a conical body made of a metal alloy and an amorphous titanium-zirconium-boron film deposited on a surface of the conical body.
Ming Chi University of Technology | Date: 2015-04-15
A method for physical vapor deposition of an aluminum nitride film, comprising: positioning a substrate and an aluminum target in a chamber; vacuuming the chamber so that a chamber pressure is at a base pressure between 7.110^(7)-510^(6 )torr; conducting a working gas composed of argon gas and nitrogen gas into the chamber so that the chamber pressure is at a working pressure between 3-7 mtorr; and depositing the aluminum nitride film on the substrate by applying a high power impulse power supply to the aluminum target and applying a direct current bias power supply to the substrate under the working pressure and a substrate temperature between room temperature (25 C.) to 200 C.; wherein a power of the high power impulse power supply is between 500-600 W and a frequency thereof is between 750-1250 Hz, and a bias of the direct current bias power supply is between 50-0 V.