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Chaiyaphum, Thailand

Udomariyasap P.,Chaiyaphum Rajabhat University | Noppanakeepong S.,King Mongkuts University of Technology Thonburi | Pornsuwancharoen N.,Rajamangala University of Technology Isan Sakon Nakhon Campus
Advanced Materials Research

Propose the simulation of THz carrier frequencies using the small device and a Gaussian beam propagating within the device system. We found that the generated output power with the high frequency can be achieved. This consisted of a serial nonlinear micro ring resonator system for generating pulse and signal filter by Add/Drop filter, a technology optical communication by the micro ring resonator which generates the THz frequency multiple, whereas channel capacity in term of multi frequency bands can be provided by optical Add/Drop multiplexing. The increase in the number of channel capacity can be obtained by the increase in frequency density, while the security was introduced by the specific frequency filter, which was operated by the central operator. The optical micro ring resonators for THz frequency generation and enhancement are reviewed. The advantage of proposed system can be implemented by using the simultaneous optical communication system. © (2014) Trans Tech Publications, Switzerland. Source

Assawamongkholsiri T.,Khon Kaen University | Reungsang A.,Khon Kaen University | Pattra S.,Chaiyaphum Rajabhat University
International Journal of Hydrogen Energy

Activated sludge (AS) from wastewater treatment plant of brewery industry was used as substrate for hydrogen production by anaerobic mixed cultures in batch fermentation process. The AS (10% TS) was pretreated by acid, heat and combined acid and heat. Combined acid- heat treatment (0.5% (w/v) HCl, 110 °C, 60 min) gave the highest soluble COD (sCOD) of 1785.6 ± 27.1 mg/L with the highest soluble protein and carbohydrate of 8.1 ± 0.1 and 38.5 ± 0.8 mg/L, respectively. After the pretreatment, the pretreated sludge was used to produce hydrogen by heat treated upflow anaerobic sludge blanket (UASB) granules. A maximum hydrogen production potential of 481 mL H 2/L was achieved from the AS pretreated with acid (0.5% (w/v) HCl) for 6 h. Copyright © 2013, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved. Source

Chansanam W.,Chaiyaphum Rajabhat University | Tuamsuk K.,Khon Kaen University
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)

This paper presents an Imaginary Beings knowledge structure, expanded from the knowledge domain of “Belief Culture” in the authors’ previous study. The knowledge was derived from several resources, content analysis was used, and then the knowledge structure was implemented in the KOS using the Idealized Cognitive model. This preliminary study found that the structure of knowledge on imaginary beings contains 5 sub-categories and 120 instances. © Springer International Publishing Switzerland 2015. Source

Reungsang A.,Khon Kaen University | Pattra S.,Chaiyaphum Rajabhat University | Sittijunda S.,Burapha University

Response surface methodology with a central composite design was applied to optimize the key factors affecting methane production from the acidic effluent coming from the sugarcane juice hydrogen fermentation process. The parameters studied were substrate concentration, ratio of NaHCO3 to substrate concentration and initial pH. The experimental results showed that substrate concentration and initial pH had significant individual (p < 0.05) effect on methane yield (MY). However, there was no interactive effect between these variables (p > 0.05). The maximum MY of 367 mL CH4/g-volatile solid (VS)added was obtained at the optimum conditions of 13,823 mg-COD/L, an NaHCO3 to substrate concentration ratio of 3.09 and an initial pH of 7.07. Under the optimum conditions, MY was enhanced 4.4-fold in comparison to raw effluent. © 2012 by the authors. Source

Pattra S.,Chaiyaphum Rajabhat University | Sittijunda S.,Udon Thani Rajabhat University
Energy Procedia

Response surface methodology (RSM) with central composite design (CCD) was applied to optimize hydrolysis conditions of water-hyacinth stem (WHS). Firstly, the effects of reaction time (h), % diluted H2SO4 concentration (v/v) and shaking speed (rpm) for hydrolyze WHS were investigated. The optimum condition for WHS hydrolysis was reaction time of 7.73 h, H2SO4 concentration of 1.31% (v/v) and stirring speed of 264.41 rpm in which a maximum total sugar of 13 g/L was obtained. Secondly, the hydrolysate WHS obtained from the optimum hydrolysis condition was further used as the substrate for hydrogen production by heat-treated anaerobic sludge. Results showed that the maximum HP of 127. 6 mmol H2/L was obtained. © 2015 The Authors. Published by Elsevier Ltd. Source

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