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최명환(M.H. Choi),강영환(Y.H. Kang),조만순(M.S. Cho),김봉구(B.G. Kim),손재민(J.M. Sohn),주기남(K.N. Choo) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5
An instrumented capsule has been used for an irradiation test of various nuclear materials in the research reactor, high-flux advanced neutron application reactor, HANARO. In this study, in order to estimate the results of an irradiation test for the material capsule and to obtain the preliminary design data of the new conceptual capsule using a liquid thermal media, the thermal analysis is performed by using a 2D model for each cross section including specimens. As a result of the tests and analyses, the maximum temperature at the reactor power of 24㎿ is 255℃ for an irradiation test and 260℃ for an FE analysis in the middle stage of the capsule. Also, from the comparison of the results for the capsule with Al and LBE thermal media, it is found that the conceptual design of a LBE capsule will meet the test requirements for a high temperature irradiation of new materials in the HANARO reactor.
VTE 처리된 강유전 LiNbO₃ 단결정 내의 Nd³+와 Er³+ 초미세 구조의 비등방성
박일우(I.-W. Park),조성호(S. H. Choh),김영미(Y. M. Kim),전웅(U. Chon),김상수(S. S. Kim),김원정(W. J. Kim),김봉구(B. G. Kim),손재민(J. M. Sohn) 한국자기학회 2005 韓國磁氣學會誌 Vol.15 No.2
We have obtained sharp and clearly resolved ESR spectra of Nd³+ and Er³+ in vapor transport equilibrium (VTE) treated LiNbO₃ crystals, consequently have determined more accurate spin Hamiltonian parameters, than those in congruent samples. The anisotropic hyperfine structures of ¹⁴³Nd³+ and (145)^Nd³+ in the VTE-treated crystals at liquid helium temperature have been analyzed. It is proposed that both rare earth ions favor the lithium site in LiNbO₃ from the consideration of the determined anisotropic g-values.