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Tuan D.A.,Hung Yen University of Technology and Education
Journal of Electrical Engineering and Technology | Year: 2015

Insulating characteristics of Cl2-He mixture gases in gas discharges were analysed to evaluate ability of these gases for using in medium voltage and many industries. These are electron transport coefficients, which are the electron drift velocity, density-normalized longitudinal diffusion coefficient, and density-normalized effective ionization coefficient, in Cl2-He mixtures. A two-term approximation of the Boltzmann equation was used to calculate the electron transport coefficients for the first time over a wide range of E/N (ratio of the electric field E to the neutral number density N). The limiting field strength values of E/N, (E/N) lim, for these binary gas mixtures were also derived and compared with those of the pure SF 6 gas. © 2015 The Korean Institute of Electrical Engineers. Source


Tuan D.A.,Hung Yen University of Technology and Education
Journal of the Korean Physical Society | Year: 2014

In order to understand quantitatively plasma phenomena and ionized gases, accurate electron collision cross-sections and electron transport coefficients for not only pure atoms and molecules but also for the binary gas mixtures are necessary. Electron transport coefficients (electron drift velocity, density-normalized longitudinal diffusion coefficient, and density-normalized effective ionization coefficient) in mixture gases of Cl2 with Ar, Xe and O2, therefore, were calculated and analyzed by using a two-term approximation of the Boltzmann equation over a wide E/N range (ratio of the electric field E to the neutral number density N). The limiting field strength values of E/N, (E/N)lim, for these binary gas mixtures were also derived and compared with those of pure SF6 gas. These binary gas mixtures are being considered for use in many industries, depending on the mixture ratio and the particular application of the gas and the electrical equipment. © 2014 The Korean Physical Society. Source


Tuan D.A.,Hung Yen University of Technology and Education
Journal of Electrical Engineering and Technology | Year: 2016

The electron transport coefficients in not only pure atoms and molecules but also in the binary gas mixtures are necessary, especially on understanding quantitatively plasma phenomena and ionized gases. Electron transport coefficients (electron drift velocity, density-normalized longitudinal diffusion coefficient, and density-normalized effective ionization coefficient) in binary mixtures of TEOS gas with buffer gases such as Kr, Xe, He, and Ne gases, therefore, was analyzed and calculated by a two-term approximation of the Boltzmann equation in the E/N range (ratio of the electric field E to the neutral number density N) of 0.1 - 1000 Td (1 Td = 10-17 V.cm2). These binary gas mixtures can be considered to use as the silicon sources in many industrial applications depending on mixture ratio and particular application of gas, especially on plasma assisted thin-film deposition. © The Korean Institute of Electrical Engineers. Source


Tran V.-T.,Hung Yen University of Technology and Education
ARPN Journal of Engineering and Applied Sciences | Year: 2016

The variable tooth thickness (VTT) hob is usually applied for longitudinal crowning work gear surface with twist free tooth flank. It is an important cutting tool for manufacturing the high precision helical gear. However, the manufacturing process fora VTT hob has not investigated yet. Therefore, in this study, we proposed a method for generating profile of VTT hob by using form grinding wheel on CNC grinding machine. A mathematical model for the tooth profile of VTT hob is established by setting the center distance between the grinding wheel and hob as a second order function of hob's longitudinal feed movement. A numeral example is presented to illustrate and verify the merits of the proposed form grinding method. © 2006-2016 Asian Research Publishing Network (ARPN). Source


Tran V.-T.,Hung Yen University of Technology and Education
ARPN Journal of Engineering and Applied Sciences | Year: 2015

On CNC shaving machine, the tooth flank of work gear can be crowned longitudinally by varying the plunge motion of shaving cutter. However, which will induce a bias error on tooth flank of the shaved work gear. In this paper, therefore, we propose a new CNC shaving method by modifying work gear rotation angle and without varying the plunge motion of shaving cutter during the gear shaving process that can be reduced the bias error of the tooth flank on shaved work gear. A numeral example is presented to illustrate and verified the merits of the proposed CNC gear shaving method in longitudinal crowning to obtain the tooth flank of work gear surface without bias error. © 2006-2015 Asian Research Publishing Network (ARPN). Source

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