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Study on the Water Durability of Zinc Boro-Phosphate Glasses Doped with MgO, Fe2O3, and TiO2
황문경,류봉기 한국물리학회 2016 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.69 No.2
The water durability of zinc boro-phosphate (PZB) glasses with the composition 60P2O5-20ZnO- 20B2O3-xMeO (x = 0, 2, 4, 6 and MeO = MgO, Fe2O3, or TiO2) (mol%) was measured, and PZB glass was studied in terms of its thermal properties, density, and FTIR characteristics. The surface conditions and corrosion byproducts were analyzed using scanning electron microscopy. When MgO, Fe2O3, and TiO2 were doped into the PZB glass, Q2 was decreased and Q1 was increased in the phosphate structure, while the number of BO4 structures increased with increasing MeO content. The density of the PZB glass was increased by the addition of Fe2O3 and TiO2, while the glass transition temperature (Tg) and dilatometric softening temperature (Td) were increased when additional MgO, Fe2O3, and TiO2 were added. From the weight loss analysis (95 C, 96 h), TiO2 doped glass showed the lowest weight loss (1.70 × 10−3 g/cm2) while MgO doped glass showed the highest value (2.44 × 10−3 g/cm2), compared with PZB glass (3.07 × 10−3 g/cm2). These results were discussed in terms of the Men+ ions in the glass structure, and their different coordination numbers and bonding strengths.
황문경,남현수,김규보,송주헌 한국수소및신에너지학회 2013 한국수소 및 신에너지학회논문집 Vol.24 No.5
In a direct coal fuel cell (DCFC) system, it is essential to identify volume fraction of coal suspended in electrolyte melt in order to control its dispersion and fluidity. This requirement is compelling especially at anode channel where hot slurry is likely to flow at low velocity. In this study, light scattering techniques were employed to measure the volume fraction for a pulverized coal suspension with relatively high absorption coefficient. The particle size, scattering angle, and volume fraction were varied to evaluate their effects on the scattering behavior as well as scattering regime. The larger coal size and smaller forward scattering angle could provide a shift to more favorable scattering regime, i.e., independent scattering, where interferences of light scattering from one particle with others are suppressed.
Energy Feedback System for the PLS-II Linac
김창범,김문경,황일문,최재영,신승환,김성철,박종두 한국물리학회 2017 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.71 No.11
The upgraded Pohang-Light-Source (PLS-II) was opened to the public in 2012. Among many improvements of the PLS-II, a top-up operation was one of the highlights of them, and the stability of the electron beam was improved significantly. For the top-up operation, a stable injection from the linac to the storage ring was critically important, so that an energy feedback system was introduced to reduce the energy jitter of the linac electron beam. The result of the feedback system was successful and the measured energy jitter was less than ±0.1% (rms). In this work, the details of the energy feedback system are presented. It includes the setup for the energy feedback system, measurement results in the optimization process, and the future work for a better performance.