Songkhla, Thailand

Songkhla Rajabhat University

www.skru.ac.th
Songkhla, Thailand

Songkhla Rajabhat University or SKRU is a Thai public university under the Rajabhat University system. The campus is in Songkhla Province, south Thailand.Songkhla Rajabhat University contains seven faculties: Arts, Agricultural Technology, Education, Humanities and Social Science, Industrial Technology, Management Science, and Science and Technology. Wikipedia.

SEARCH FILTERS
Time filter
Source Type

WO3-doped TiO2 coating on charcoal activated (CA) was prepared by microwave-assisted sol-gel method. The samples calcined at the temperature of 500°C for 2 h with a heating rate of 10°C/min were characterized by XRD, EDS, and SEM. The photocatalytic and antibacterial activities of WO3-doped TiO2 coating on CA were investigated by means of degradation of a methylene blue (MB) solution and against the bacteria E. coli, respectively. The effects of WO3 concentration were discussed. The 1% WO3-doped TiO2 coated CA seems to exhibit the higher photocatalytic and antibacterial activity than other samples. The WO3-doped TiO2 coated on CA are expected to be applied as a photocatalyst for water purification. © 2017 Weerachai Sangchay.


Sitthipong S.,Prince of Songkla University | Towatana P.,Songkhla Rajabhat University | Sitticharoenchai A.,Prince of Songkla University | Meengam C.,Songkhla Rajabhat University
Materials Today: Proceedings | Year: 2017

This research aimed to investigate the wear behaviors of weld surfacing of propeller shaft, by using AISI 4140 alloy steel, and compared the results obtained by different welding processes: shield metal arc welding process, metal active gas welding process, and flux core arc welding process. The methods of testing consisted of creating the weld surfacing and take it to the abrasive wear testing, which the weldings are done normally.From the result, it is found that the weld metalsfrom those three welding processes have significant differences of abrasive wear resistance values. The flux core arc welding process produced the highest value of abrasive wear resistance, especially at the weld metal zone where the highest abrasive wear resistance was attained dominantly. It generated the highest hardness value of 275 HV. On the other hand, the metal active gas welding process produced the lowest value of abrasive wear resistance, which it gave the hardness value of 200 HV. At last, it can be concluded that resurfacing by using flux core arc welding process generates the most applicable result of welding for AISI 4140 alloy steel; as a result, it will be the guideline of choosing the welding process for resurfacing, in order to use it to prolong the service life of propeller shaft effectively. © 2017 Elsevier Ltd.


Sangchay W.,Songkhla Rajabhat University | Namsai A.,Songkhla Rajabhat University
Materials Today: Proceedings | Year: 2017

ZnO powders were synthesized by sol-gel method from Zn(CH3COO)2.2H2O. The prepared powders were calcined at the temperature of 300, 500 and 700 °C for 1 h with the heating rate of 10 °C/min. Several analytical techniques including XRD, EDX and TEM were employed to characterize the synthesized powders. The antibacterial activity was evaluated by the inactivation of S. aureus under UV irradiation for a certain time. It was observed that higher calcination temperature gave superior antibacterial activity. At the highest calcination temperature investigated in this experiment, the powders showed antibacterial activities of 100.00% under UV irradiation for 20 min. © 2017 Elsevier Ltd. All rights reserved.


Meengam C.,Songkhla Rajabhat University | Chainarong S.,Songkhla Rajabhat University | Muangjunburee P.,Prince of Songkla University
Materials Today: Proceedings | Year: 2017

The purpose of this study is to evaluate the welding characteristic of friction welded similar joints of SSM7075 aluminum alloys. Friction welding methods were investigated by joining parameters as follows: rotational speed of 1200, 1400, 1600, and 1800 rpm, burn of length of 2.5, 3.0, and 3.5 mm, feed rate of 0.2 mm/min, and welding time for 15 seconds respectively. The results of the investigation have shown that joining parameters with rotational speed of 1800 rpm, burn of length of 3.5 mm, and 15 seconds of welding time can produce a very good weld with the highest joint strength at 104.53 MPa., which had joint efficiency for 63 percent compared with base metal. The results of this investigation have shown that an average hardness is around 140.31 HV in weld zone. Examination of the joint region using SEM showed the microstructure in weld zone after welding is fine structure; both aluminum phase (α) and eutectic phases (MgZn2) from SSM7075 Aluminum alloys have mixed together. The eutectic phases in weld zone are an elongated and plate-like shape of MgZn2 particles, which was destroyed by frictional force as fractures of the eutectic phases. After friction welding, the particle size is around 1.518 μm long and 1.140 μm wide and it was also found that MgZn2 fractures are evenly distributed in welded zone. However, after friction welding process, it was found that grain structures in welded zone are refined from globular structures into fine structures. © 2017 Elsevier Ltd.


In this study, TiO2 doped with SnO2 thin films were preparaed by the sol-gel method. The thin films were deposited onto glass substrate and calcinations at the temperature of 700 °C for 2 h with the heating rate of 10°C/min. Doping concentrations were varied between 0 to 5%mol. Microstructures of the fabricated thin films were characterized by SEM and XRD techniques. The photocatalytic properties of the thin films were also tested via the degradation of methylene blue (MB) solution under fluorescent irradiation. Finally, self-cleaning properties of thin films were evaluated by measuring the contact angle of water droplet on the thin films with and without fluorescent irradiation. The result showed that TiO2 doped with 1 mol% of SnO2 thin films has highest photocatalytic and self-cleaning properties under fluorescent irradiation. © 2016 The Authors.


Sangchay W.,Songkhla Rajabhat University
Digest Journal of Nanomaterials and Biostructures | Year: 2014

Fe doped TiO2thin films coatings on glass fiber have been prepared by the sol-gel method and calcined at 500 °C for 2 h with a heating rate of 10 °C/min. The thin films were characterized by XRD, SEM, AFM, photocatalytic activity was determined by means of degradation of methylene blue (MB) solution and antibacterial activity was evaluated by the inactivation of Escherichia coli (E. coli) bacteria. The antibacterial activity against E. coli, has been studied applying the so called antibacterial drop test. The bactericidal activity for the above bacteria cells was estimated by relative number of bacteria survived calculated from the number of viable cells which form colonies on the nutrient agar plates. The results show that the thin films exhibited a high antibacterial activity, which was enhanced with the increase of Fe dopant concentration. With the highest dopant concentration investigated in this experiment (TiO2doped Fe with 5 mol% condition) the thin films show antibacterial activity of 97.78% under UV irradiation for 40 min. © 2014, Inst Materials Physics. All rights reserved.


Sangchay W.,Songkhla Rajabhat University
Advanced Materials Research | Year: 2013

TiO2 powders were prepared by sol-gel method. The prepared powders were synthesized at the temperature of 500 °C to 700 °C for 2 h with a heating rate of 10 °C/min. The characterizations of synthesized powders were characterized by XRD and SEM. Finally, photocatalytic activity was evaluated by UV-vis spectrophotometer compared with commercial P25. The results show all samples have the agglomeration. It was found that the effect of calcinations temperature on phase transformation, crystallite size, morphology and photocatalytic activity of the synthesized powders. It can be note that TiO2 powders show highes of photocatalytic activity more than P25 and calcined at 700 °C were found to give the highest photocatalytic efficiency (82%) under UV irradiation 6 h. © (2013) Trans Tech Publications, Switzerland.


Sangchay W.,Songkhla Rajabhat University
Advanced Materials Research | Year: 2013

TiO2 powders were prepared by sol-gel method. The prepared powders were synthesized at the temperature of 200 °C to 700 °C for 2 h with a heating rate of 10 °C/min. The characterizations of synthesized powders were characterized by XRD and SEM. Finally, photocatalytic activity was evaluated by UV-vis spectrophotometer. The results show all samples have the agglomeration. It was found that the effect of calcinations temperature on phase transformation, crystallite size, morphology and photocatalytic activity of the synthesized powders. It can be note that TiO2 powders calcined at 700 °C were found to give the highest photocatalytic efficiency (81.7%) under UV irradiation. © (2013) Trans Tech Publications, Switzerland.


Sangchay W.,Songkhla Rajabhat University
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2014

The purpose of this research was to study the effect of calcinations temperature on phase transformation, crystallite size, morphology, photocatalytic activity and self-cleaning properties of TiO2 and SnO2/TiO2 thin films. The thin films were preparation by sol-gel dip coating process and calcinations at the temperature of 500 °C, 600 °C and 700 °C for 2 h with the heating rate of 10 °C/mim. The microstructures of the fabricated thin films were characterized by XRD and SEM techniques. The photocatalytic activity of the thin films was also tested via the degradation of methylene blue solution under UV irradiation. Finally, self-cleaning properties of thin films were evaluated by measuring the contact angle of water droplet on the thin films with and without UV irradiation. It was found that SnO2/TiO2 thin films calcinations at the temperature of 500 °C shows the highest of photocatalytic activity and self-cleaning properties. © 2014 SPIE.


This paper describes underwater obstacle avoidance and path re-planning techniques for autonomous surface vehicle (ASV) based on simulated multi-beam forward looking sonar images. The sonar image is first simulated and then a circular obstacle is defined and created in the field of view of the sonar. In this study, the robust real-time path re-planning algorithm based on an A* algorithm is developed. Our real-time path re-planning algorithm has been tested to regenerate the optimal path for several updated frames with a proper update frequency between the start point and the goal point both in static and dynamical environments. The performance of proposed method is verified through simulations, and tank experiments using an actual ASV. While the simulation results are successful, the vehicle model can avoid both single obstacle, multiple obstacles and moving obstacle with the optimal trajectory. For tank experiments, the proposed method for underwater obstacle avoidance system is implemented with the ASV test platform. The vehicle is controlled in real-time and moderately succeeds in its avoidance against the obstacle simulated in the field of view of the sonar together with the proposed position stochastic estimation of the vehicle. © 2015, ENGINEERING JOURNAL. All rights reserved.

Loading Songkhla Rajabhat University collaborators
Loading Songkhla Rajabhat University collaborators