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Journal of Mechanical and Electrical Intelligent System (JMEIS, J. Mech. Elect. Intel. Syst.)

An international open-access peer-reviewed journal

ISSN 2433-8273




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Vol.2, No.1






Solar disinfection of Escherichia coli: A comparative analysis of 3 types of reactors and TiO2 concentration using a compound parabolic concentrator                                      

Mati Nararom, Sirichai Thepa, Jirasak Kongkiattikajorn, Panusak Moonsri

Journal of Mechanical and Electrical Intelligent System, Vol.2, No.1, pp.1-13, 2019.

Abstract: Bacterial disinfection effect on survival of E.coli K12 was carried out with the reactor configuration of different solar illuminated areas by 3 types of reactors. Moreover, the objective of this research was to determine the effectiveness of water disinfection by using 3 types of reactor surfaces. The pilot system consisted of a compound parabolic concentrator, which examined water disinfection efficiency. The results reveal that of all the small areas of all 3 reactor surfaces, the catalyst reactor was slightly more effective at dropping bacteria concentration by about 1 log. However, in the experiment with larger areas, the catalyst reactor and black reactor are more effective at dropping bacteria concentration. This result shows the black reactor surface could be applied to water disinfection, which dropped more than 2 logs. Moreover, the catalyst reactor has the most effect on dropping bacteria concentration, to 4 logs. Therefore, TiO2 has been proven as a water disinfection process for organic contamination. Moreover, the experiments were also carried out using titanium dioxide (TiO2) by suspension at 0.25, 0.5, 0.75, 1 g/L as a slurry form, which determined the effect of the TiO2 concentration on bacteria inactivation. The result reveal that the TiO2 concentration at 1 g/L is the most effect to drop bacteria concentration to 4 logs. The application of this article reveals the black color and photocatalytic disinfection technology in CPC could be applied for water disinfection by global solar radiation.

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Fast Response, Small Ripple, Low Noise Switching Converter with Digital Charge Time Control and EMI Harmonic Filter

Minh Tri Tran, Yifei Sun, Noriyuki Oiwa, Yasunori Kobori, Anna Kuwana, Haruo Kobayashi 

Journal of Mechanical and Electrical Intelligent System, Vol.2, No.1, pp.14-23, 2019.

Abstract: This paper describes a selection method of L, C parameters for a given load resistance R to realize well-balanced performance of a buck converter and its EMI harmonic filter design method based on the modern optimal and adaptive control theory. We show that when |ZL| = |ZC| = 2R is satisfied at the angular frequency of f = 1/2(LC)1/2, then fast response, small overshoot and low ripple (smaller than 0.4mVpp) can be realized simultaneously. Also by adopting two LC notch filters whose notches are at the fundamental and second harmonic frequencies respectively, the EMI noises are reduced significantly (7dB reduction at the 1st harmonic, 2dB reduction at the 2nd harmonic).

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