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전병훈,하성철 한국전기전자재료학회 2003 전기전자재료학회논문지 Vol.16 No.5
The electron-atom collision studies have been essentially used for testing and developing suitable theories of the scattering and collision processes, and for providing a tool for obtaining detailed information on the structure of the target atoms and molecules and final collision products. And, the development of that has also been strongly motivated by the need for electron collision data in such fields as laser Physics and development, astrophysics, Plasma devices, upper atmospheric processes and radiation physics. The concept and the Principle of determination of the electron collision cross sections for atoms and molecules by using the present electron swarm method are explained.
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전자군 방법에 의한 C<sub>3</sub>F<sub>8</sub>분자가스의 비탄성충돌단면적의 결정
전병훈,Jeon Byung-Hoon 한국전기전자재료학회 2006 전기전자재료학회논문지 Vol.19 No.3
The electron drift velocity W and the product of the longitudinal diffusion coefficient and the gas number density $ND_{L}$ in the $0.525\;\%$ and $5.05\;\%$ $C_{3}F_8-Ar$ mixtures were measured by using the double shutter drift tube with variable drift distance over the E/N range from 0.03 to 100 Td and gas pressure range from 1 to 915 torr. And we determined the electron collision cross sections set for the $C_{3}F_8$ molecule by STEP 1 of electron swarm method using a multi-term Boltzmann equation analysis. Our special attention in the present study was focused upon the vibrational excitation and new excitations cross sections of the $C_{3}F_8$ molecule.
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전병훈,Jeon, Byung-Hoon 한국전기전자재료학회 2007 전기전자재료학회논문지 Vol.20 No.9
We measured the electron drift velocity, W, in 0.5% $SF_6-Ar$ mixture over the E/N range from 30 Td to 300 Td and gas pressure range from 0.1 to 0.5 Torr by the double shutter drift tube with a variable drift distance, and calculated over the same E/N and gas pressure range by using the two-term approximation of the Boltzmann equation. The measured and calculated values at different gas pressure at each E/N was appreciable dependence in the results on the gas pressure.
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Adsorption of DCM and MTBE from Aqueous Phase on Granular Activated Carbons: A Comparative Study
전병훈,Moonis Ali Khan,이상훈 한국자원공학회 2010 Geosystem engineering Vol.13 No.3
The laboratory scale batch adsorption studies were conducted to investigate and compare the adsorption potential of granular activated carbons (GACs) for the removal of dichloromethane (DCM) and methyl tert-butyl ether (MTBE) from aqueous medium. The effect of various parameters such as solution pH, initial adsorbate concentration, contact time, dose of GACs, and temperature on the adsorption was studied. The optimum adsorption of DCM and MTBE on lignite granular activated carbon (LGAC) was observed at pH 7 while, optimum adsorption on bituminous granular activated carbon (BGAC) was observed in the pH between pH 6 and 8. The equilibrium data was fitted to Langmuir, Freundlich and Temkin models. Freundlich model best described the equilibrium adsorption. Contact time studies showed comparatively lower equilibration time for the adsorption of DCM on GACs. Kinetics modeling was done by applying pseudo-first-order,pseudo-second-order and Elovich models. Good agreement between experimental and theoretical adsorption capacity values along with higher regression coefficient values showed the validity of pseudo-second-order kinetics model. The thermodynamics studies showed endothermic and spontaneous process with randomness at the solid/solution interface. The adsorption of DCM and MTBE on GACs was interpreted to represent a physical adsorption.
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