http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
The stoichiometry and the oxygen potential change of urania fuels during irradiation
Park, Kwangheon,Yang, Myung-Seung,Park, Hyun-Soo 慶熙大學校 材料科學技術硏究所 1997 材料科學技術硏究論集 Vol.10 No.-
A defect model for irradiated UO₂ fuel solid-solution was devised based on the defect structure of pure urania. Using the equilibrium between fuel solid-solution and fission-products and the material balance within the fuel, the stoichiometry change of urania fuel was traced with burn-up. This tracing method was applied to high burn-up fuels. The oxygen potential of urania fuel turned out to increase slightly with burn-up. The stoichiometric change was calculated to be negligible due to the buffering role of Mo.
Oxygen Diffusion in Polycrystalline Zirconia
Park, Kwangheon 慶熙大學校 材料科學技術硏究所 1991 材料科學技術硏究論集 Vol.4 No.-
지르코늄 금속을 산화시켜 얻어진 산화지르코늄 다결정의 산소 확산계수를 기체-고체 동위원소 교환 방법으로 구하였다. 다결정 산화지르코늄의 결정립은 원주형의 형태를 띄었고, 원주의 반경은 표면에서 내부로 갈수록 깊이에 비례하여 증가하였다. 단결정과 다결정의 전체 산소 확산계수를 비교하여 주로 산소의 이동은 결정립계를 따라 이루어짐을 알게 되었다. 결정립계 산소확산 계수를 다결정시편의 단위 결정립을 반경이 일정한 원주로 가정하여 구하였다. 립계 산소확산계수와 분리인자의 곱한 값이 약 10^(-11)∼10^(-10)㎤/s가 되었고, 이 값은 다른 산화물에서 얻어진 값과 비교하면 매우 적절한 값이다.
Kwangheon Park,Moonsung Koh,Doohyun Yang,김학원,Hongdoo Kim* 대한화학회 2005 Bulletin of the Korean Chemical Society Vol.26 No.3
The bis(2,4,4-trimethylpentyl)phosphinic acid (Cyanex-272) and sodium diethyl- dithiocarbamate (NaDDC) ligands were used to extract of metal ions (Cd2+, Co2+, Cu2+, Pb2+, Zn2+) in supercritical CO2. Experiments showed a strong synergistic effect and better extraction efficiency if the two ligands were used together. In-situ UV-visible observation indicates that NaDDC in the water/supercritical CO2 started to decompose slowly. The synergistic effect seems to come from the deprotonation of the organophosphorus ligand by amines from the decomposed NaDDC. The enhancing role of amines was confirmed using the mixture of Cyanex-272 and diethylamine(DEA) in the metal extraction.
박광헌,양명승,박현수 慶熙大學校 材料科學技術硏究所 1994 材料科學技術硏究論集 Vol.7 No.-
The oxygen potential of urania with soluble fission products is modeled based on the point defect chemistry. This model explains well the measured values. The oxygen potential of the UO_(2) fuel is also calculated with the assumption of the closed system. The calculated oxygen potential is within the error of the experimental values. This model can be used for the analyses of physical and chemical properties of high bumup fuels.