T. T. Tsung

The study of hydrophilic characteristics of ethylene glycol

This paper describes the way to measure Ethylene Glycol resistance (Ω). The Electronic Sensing of Hydrophilic Characteristics was design to measure Ethylene Glycol moisture contain in real-time. Many liquids contain the Glycol such as brake fluid, antifreeze and cosmetic. The percent of water contain may affect those liquids functions. It will measure the Ethylene Glycol resistance (Ω) and could be converted into voltage for the use of moisture meter. The relation between Ethylene Glycol with moisture contain and its resistance (Ω) is closed to linear. The hydrophilic characteristics is the molecular model of OH structure which has a Hydrogen atom (H) bonded to the Oxygen atom (O) ; it will absorb the electron cloud at the outer layer of Hydrogen atom; so the electrons within O-H bond have a higher probability of appearance around the Oxygen atom. The O-H bond is similar to a chemical bond which can absorb the water molecules.

Process development and photocatalytic property of nanofluid prepared by combined ASNSS

Abstract This study proposes a new method: the combined arc-submerged nanoparticle synthesis system (ASNSS) for preparing TiO2 nanofluid. In addition to the influence of the various process variables such as breakdown voltage, peak current and dielectric liquid temperature on nanoparticles, this study will also discuss the photocatalytic activity of the prepared TiO2 nanoparticle suspension. To examine the photocatalytic activity of the TiO2, the photodecomposition of salicylic acid was carried out. Experimental results show that the proposed method can successfully prepare anatase TiO2 and this nanofluid can be stabilised for longer than six months. The rate constant of photocatalytic reaction of TiO2 nanoparticles for salicylic acid is 0·0035. Experimental results indicate that the TiO2 nanoparticle fluid possesses excellent photocatalytic activity in photodegradation of salicylic acid.

The electrochemical properties of SiC nanoparticle suspension

This study places SiC nanoparticles into deionized water and uses NaOH and H2SO4 to produce alkaline and acid nanofluids, respectively. A Cu electrode was then inserted into the SiC nanofluid with different voltages activated to observe particle absorption at the electrode and to investigate the electrochemical properties of SiC nanofluid under the influence of voltage, as well as the aggregation and precipitation of particles. In addition, the three-polar method is used to produce anodic polarization curves of the acid and alkaline solutions with the SiC particles to determine the electric potentials of oxidation reduction of the acid and alkaline nanofluids, respectively. The overall purpose of this research was to investigate the electrical properties of SiC nanoparticles in SiC nanofluids of varying pH values.

Photodecomposition of gaseous toluene using TiO2 prepared by SANSS

This study examined the photodecomposition of volatile organic compounds (VOCs) using TiO2 catalyst fabricated by the Submerged Arc Nanoparticle Synthesis System (SANSS). The TiO2 catalyst was employed to decompose gaseous toluene and compared with Degussa- P25 TiO2 in terms of decomposition efficiency. It was found that gaseous toluene exposed to UV irradiation produced intermediates that were even harder to decompose. After 60-min of photocomposition, Degussa-P25 TiO2 reduced the concentration of gaseous toluene to 8.18% while the concentration after decomposition by SANSS TiO2 catalyst dropped to 0.35%. The results show that TiO2 prepared by SANSS has great efficiency in decomposing both gaseous toluene and its intermediates.

Photocatalytic activity of TiO2 nanoparticle fluid prepared by combined ASNSS

Abstract In this article, low-pressure control methods for a combined arc submerged nanoparticle synthesis system (ASNSS) was proposed and developed for TiO 2 nanoparticle fabrication. The photocatalytic reaction is carried out in a photochemical reactor. The UV light is obtained from UV-lamps with wavelength of (253.7±0.8) nm. The UV-Vis spectrometry is used to monitor the absorbance spectra of methylene blue as a function of illumination time. Experimental results show that the rate constant of photocatalytic reaction of TiO 2 nanoparticles for methylene blue is 0.0365 min −1 . The surface adsorption plays an important role in the decomposition of methylene blue. Experimental results indicate that the TiO 2 nanoparticle fluid possesses excellent photocatalytic activity in photodegradation of methylene blue.

The Friction of Vehicle Brake Tandem Master Cylinder

The behaviour of an elastomeric seal for vehicle brake Tandem master cylinder is measured and analyzed in temperature and brake fluids changed. Working conditions are simulated for different piston rod velocity and cylinder supply pressure, in temperature rising, brakefluid boundary and Nanoaluminum oxide brakefluid oxide brakefluid lubrication. The result shows that Nanoaluminum oxide brakefluid with its ball shape can highly reduce friction coefficient to avoid seal excessive wear and reduce slick slip in brake applications.

Dynamic Characteristics of a Recoil System When Firing Projectiles with Mach 4.4 Muzzle Velocity from a 105 mm Cannon

This paper discusses the dynamic characteristics of a recoil system when firing armour-piercing fin-stabilized discarding sabot projectiles. They are fired with a muzzle velocity of Mach 4.4 from a 105 mm caliber cannon either equipped with a multi-perforated muzzle brake (MPMB) or with a bare muzzle. In the recoil system, the MPMB moderates the recoil velocity and prolongs the time of resistance to the propellant gases’ force, thereby reducing the inner pressure of the cradle, which possesses both functions of the recoil cylinder and the elevating center, and attenuating the recoil force on the trunnions. The reasons for the formation of each of the dynamic characteristics are discussed. All measurements in this study can be a significant reference for developing guns, tanks, or the chassis of fighting vehicles.

The Measurement and Analysis of Pressure Square Wave Generator

Investigating the dynamic characteristics is a significant study for actual hydraulic pressure system because the dynamic environment is used more often than static one. A dynamic pressure generator is called pressure square wave generator (PSWG) that developed in our team and generate square-like waveform and change testing pressure and frequency form 0.1 to 5 MPa and 12 to 2 KHz, respectively. In this study, dynamic performance of PSWG was investigated under different testing tangent velocity of rotor of PSWG including detailed transient response of a pressure square-like wave, rise time and deviation of magnitude. Results show that the tangent velocity of the rotor of PSWG affects the transient response of pressure square-like wave form. The desired transient response can be obtained when the tangent velocity is larger than 0.5 m/s. Furthermore, the larger the tangent velocity used, the smaller the rise time will be.

Development of pneumatic actuator with low-wave reflection characteristics

This study aims at the development of a less reflective electromagnetic pneumatic actuator often used in the anechoic chamber. Because a pneumatic actuator on the market is not appropriate for use in such a chamber and a metallic one has high dielectric constant which generates reflective electromagnetic waves to influence test parameters in the chamber. The newly developed pneumatic actuator is made from low dielectric constant plastics with less reflective of electromagnetic. A turbine-type air motor is used to develop the pneumatic actuator and a employ Prony tester is used to run the brake horsepower test for the performance test of pneumatic actuator. Test results indicate that the pneumatic actuator in the minimal starting flow is 17 l/min, and it generates a brake horsepower of 48 mW; in the maximum flow is 26 l/min, it generates a brake horsepower of 108 mW. Therefore, it works with a torque between 0.24 N-m and 0.55 N-m, and such a torque will be sufficient to drive the target button.

Hydraulic square pressure generator for dynamic calibration of pressure sensors at low frequencies

A hydraulic square pressure generator with a unique spool valve has been developed for use in a system to calibrate and evaluate the dynamic characteristics of pressure sensors. This hydraulic square pressure generator generates a hydraulic square pressure with a rapid transient response in the time domain and with abundant harmonics in the frequency domain at low fundamental frequencies, rather than square pressure with poor harmonics at high fundamental frequencies. Its rise time and fundamental frequency are around 32.0 μs and 5 Hz, respectively, supporting a wide range of dynamic calibration of hydraulic square pressure generators. The sensing cavity in the hydraulic square pressure generator constrains the pressure transient produced by the fluid in the valve and maintains the generated hydraulic square pressure for both tested and reference pressure sensors. Three pressure sensors are calibrated using the hydraulic square pressure produced by the system with an auto-regressive exogenous model. Their transfer functions are obtained by applying the common pole-zero principle to describe their dynamic characteristics in the frequency domain.