Songkhla, Thailand
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.


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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.


Wayakron Phetphaisit C.,Naresuan University | Bumee R.,Naresuan University | Namahoot J.,Naresuan University | Ruamcharoen J.,Prince of Songkla University | Ruamcharoen P.,Songkhla Rajabhat University
International Journal of Adhesion and Adhesives | Year: 2013

Polyester polyurethane elastomer adhesives were prepared from hydroxyl liquid natural rubber and modified poly(ethylene terephthalate) with polymeric MDI. The starting materials and PU adducts were characterized by FT-IR in transition and ATR modes. The effect of the amount of hydroxyl groups on modified rubber, types of modified PET, and NCO/OH ratios were studied by wood-to-wood adhesion shear strength. The chemical resistance and green strength of PU adhesives were also analyzed by lab shear test. It was found that the synthesized carboxyl terminated PET and modified rubber contained 50% hydroxyl content with polymeric MDI in optimized NCO/OH molar ratio (0.45:0.55:0.75 by mole) presented the highest wood adhesive shear strength and chemical resistance, and present 83% of its maximum strength within only 12 h. © 2012 Elsevier Ltd. All rights reserved.


Senadheera S.D.,Deakin University | Senadheera S.D.,National Institute of Fisheries and Nautical Engineering | Turchini G.M.,Deakin University | Thanuthong T.,Deakin University | And 2 more authors.
Journal of Agricultural and Food Chemistry | Year: 2011

Global shortages in fish oil are forcing the aquaculture feed industry to use alternative oil sources, the use of which negatively affects the final fatty acid makeup of cultured fish. Thus, the modulation of fatty acid metabolism in cultured fish is the core of an intensive global research effort. The present study aimed to evaluate the effects of various dietary α-linolenic acid (ALA, 18:3n-3)/linoleic acid (LA, 18:2n-6) ratios in cultured fish. A feeding trial was implemented on the freshwater finfish Murray cod, in which fish were fed either a fish oil-based control diet or one of five fish oil-deprived experimental diets formulated to contain an ALA/LA ratio ranging from 0.3 to 2.9, but with a constant total C 18 PUFA (ALA+LA) content. The whole-body fatty acid balance method was used to evaluate fish in vivo fatty acid metabolism. The results indicate that dietary ALA was more actively β-oxidized and bioconverted, whereas LA appears to be more efficiently deposited. LA was β-oxidized at a constant level (∼36% of net intake) independent of dietary availability, whereas ALA was oxidized proportionally to dietary supply. The in vivo apparent Δ-6 desaturase activity on n-3 and n-6 PUFA exhibited an increasing and decreasing trend, respectively, in conjunction with the increasing dietary ALA/LA ratio, clearly indicating that this enzymatic activity is substrate dependent. However, the maximum Δ-6 desaturase activity acting on ALA peaked at the substrate level of 3.2186 (μmol g fish -1 day -1), suggesting that additional inclusion of ALA is not only wasteful but counterproductive in terms of n-3 LC-PUFA production. Despite a constant total supply of ALA+LA, the recorded total in vivo apparent Δ-6 desaturase activity on both substrates (ALA and LA) increased in synchrony with the ALA/LA ratio, peaking at 1.54, and a 3.2-fold greater Δ-6 desaturase affinity toward ALA over LA was recorded. © 2011 American Chemical Society.


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.


Kaewploy S.,Songkhla Rajabhat University | Meengam C.,Songkhla Rajabhat University
MATEC Web of Conferences | Year: 2015

Liquid state welding techniques available are prone to gas porosity problems. To avoid this solid state bonding is usually an alternative of preference. Among solid state bonding techniques, diffusion bonding is often employed in aluminium alloy automotive parts welding in order to enhance their mechanical properties. However, there has been no standard procedure nor has there been any definitive criterion for judicious welding parameters setting. It is thus a matter of importance to find the set of optimal parameters for effective diffusion bonding. This work proposes the use of response surface methodology in determining such a set of optimal parameters. Response surface methodology is more efficient in dealing with complex process compared with other techniques available. There are two variations of response surface methodology. The one adopted in this work is the central composite design approach. This is because when the initial upper and lower bounds of the desired parameters are exceeded the central composite design approach is still capable of yielding the optimal values of the parameters that appear to be out of the initially preset range. Results from the experiments show that the pressing pressure and the holding time affect the tensile strength of jointing. The data obtained from the experiment fits well to a quadratic equation with high coefficient of determination (R2 = 94.21%). It is found that the optimal parameters in the process of jointing semi-solid casting aluminium alloy by using diffusion bonding are the pressing pressure of 2.06 MPa and 214 minutes of the holding time in order to achieve the highest tensile strength of 142.65 MPa. © Owned by the authors, published by EDP Sciences, 2015.


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.

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