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Kim, C.J.,Kim, Y.J.,Lim, C.Y.,Jun, B.H.,Park, S.D.,Choo, K.N. The Korea Institute of Applied Superconductivity a 2014 한국초전도저온공학회논문지 Vol.16 No.2
Temperature dependence of magnetic moment (m-T) and the magnetization (M-H) at 5 K and 20 K of the in situ processed $MgB_2$ bulk pellets with/without carbon (C) doping were examined. The superconducting critical temperature ($T_c$), the superconducting transition width (${\delta}T$) and the critical current density ($J_c$) were estimated for ten test samples taken from the $MgB_2$ bulk pellets. The reliable m-T characteristics associated with the uniform $MgB_2$ formation were obtained for both $MgB_2$ pellets. The $T_cs$ and ${\delta}Ts$ of all test samples of the undoped $MgB_2$ were the same each other as 37.5 K and 1.5 K, respectively. The $T_cs$ and ${\delta}Ts$ of the C-doped $MgB_2$ were 36.5 K and 2.5 K, respectively. Unlike the m-T characteristics, there existed the difference among the M-H curves of the test samples, which might be caused by the microstructure variation. In spite of the slight $T_c$ decrease, the C doping was effective in enhancing the $J_c$ at 5 K.
Kim, C.J.,Park, S.D.,Jun, B.H.,Kim, B.G.,Choo, K.N.,Ri, H.C. 한국초전도저온공학회 2014 한국초전도저온공학회논문지 Vol.16 No.1
Effects of neutron irradiation on the superconducting properties of the undoped $MgB_2$ and the carbon(C)-doped $MgB_2$ bulk superconductors, prepared by an in situ reaction process using Mg and B powder, were investigated. The prepared $MgB_2$ samples were neutron-irradiated at the neutron fluence of $10^{16}-10^{18}n/cm^2$ in a Hanaro nuclear reactor of KAERI involving both fast and thermal neutron. The magnetic moment-temperature (M-T) and magnetization-magnetic field (M-H) curves before/after irradiation were obtained using magnetic property measurement system (MPMS). The superconducting critical temperature ($T_c$) and transition width were estimated from the M-T curves and critical current density ($J_c$) was estimated from the M-H curves using a Bean's critical model. The $T_cs$ of the undoped $MgB_2$ and C-doped $MgB_2$ before irradiation were 36.9-37.0 K and 36.6-36.8 K, respectively. The $T_cs$ decreased to 33.2 K and 31.6 K, respectively after irradiation at neutron fluence of $7.16{\times}10^{17}n/cm^2$, and decreased to 22.6 K and 24.0 K, respectively, at $3.13{\times}10^{18}n/cm^2$. The $J_c$ cross-over was observed at the high magnetic field of 5.2 T for the undoped $MgB_2$ irradiated at $7.16{\times}10^{17}n/cm^2$. The $T_c$ and $J_c$ variation after the neutron irradiation at various neutron fluences were explained in terms of the defect formation in the superconducting matrix by neutron irradiation.
C.-J. Kim,S.-D. Park,B.-H. Jun,B. G. Kim,K.-N. Choo,H.-C. Ri 한국초전도저온공학회 2014 초전도와 저온공학 Vol.16 No.1
Effects of neutron irradiation on the superconducting properties of the undoped MgB2 and the carbon(C)-doped MgB2 bulk superconductors, prepared by an in situ reaction process using Mg and B powder, were investigated. The prepared MgB2 samples were neutron-irradiated at the neutron fluence of 1016-1018 n/cm2 in a Hanaro nuclear reactor of KAERI involving both fast and thermal neutron. The magnetic moment-temperature (M-T) and magnetization-magnetic field (M-H) curves before/after irradiation were obtained using magnetic property measurement system (MPMS). The superconducting critical temperature (Tc) and transition width were estimated from the M-T curves and critical current density (Jc) was estimated from the M-H curves using a Bean’s critical model. The Tcs of the undoped MgB2 and C-doped MgB2 before irradiation were 36.9-37.0 K and 36.6-36.8 K, respectively. The Tcs decreased to 33.2 K and 31.6 K, respectively after irradiation at neutron fluence of 7.16×1017 n/cm2, and decreased to 22.6 K and 24.0 K, respectively, at 3.13×1018 n/cm2. The Jc cross-over was observed at the high magnetic field of 5.2 T for the undoped MgB2 irradiated at 7.16×1017 n/cm2. The Tc and Jc variation after the neutron irradiation at various neutron fluences were explained in terms of the defect formation in the superconducting matrix by neutron irradiation.
腸溶皮된 醫藥用 乳酸菌의 人共消化液內 活性에 관한 實驗的 硏究
이원창,용중환,추범수,김대선,송재옹 대한보건협회 1986 대한보건연구 Vol.12 No.2
In order to an observation and fundamental study on the behavior of enterocoated Lactobacillus acidophilus in the various artificial digestive fluids. It is hoped that the information will be use for reference in future endeavors of study in the field of Public Health and Applied Microbiology in Korea. The results were summerized as follows: 1) Behavior of enterocoated Lactobacilli in artificial gastric juice was not harmed in juice, because of its protective capsule called the container which can melt only intestinal tract. 2) Observed on the behavior of enterocoated Lactobacilli were showed tolerance to the artificial bile juice in 0.3% and enteric juice in pH 6.7.
Choo, D. C.,Yoon, Y. B.,Lee, D. U.,Kim, T. W.,Lee, H. K.,Kim, Y. K. TaylorFrancis 2007 Molecular Crystals and Liquid Crystals Vol.470 No.1
<P> The optical properties of organic light-emitting devices (OLEDs) with multiple heterostructures consisting of N, N'-bis-(1-naphthyl)-N, N'-diphenyl-1,1'-biphenyl-4,4'-diamine(NPB)/5,6,11,12-tetraphenylnaphthacene (rubrene) emitting layers were investigated. The optical properties of the OLEDs were significantly affected by the number of heterostructures. The electroluminescence intensity corresponding to the rubrene peak for the OLEDs increased with increasing driving voltage and with increasing number of heterostructures. The Commission Internationale de l'Eclairage (CIE) chromaticity coordinates became stabilized with increasing the number of heterostructures, and the coordinates maintained almost constant, regardless of the driving voltage. The CIE chromaticity coordinate of the OLEDs with 5-periods of the heterostructures was (0.37, 0.54), indicative of a yellow color.</P>
Kim, C.J.,Yi, J.H.,Jun, B.H.,You, B.Y.,Park, S.D.,Choo, K.N. North-Holland 2014 Physica. C, Superconductivity Vol.502 No.-
The pore formation in in situ processed MgB<SUB>2</SUB> bulk superconductors was systematically examined in terms of a reaction temperature and time. Powder compacts of magnesium (Mg) and boron (B) were heat-treated at a temperature below or above the melt point (m. p., 649<SUP>o</SUP>C) of Mg for various time periods. As the reaction time increased at each reaction temperatures, the size of the powder compacts increased and the compact weight was decreased. The de-densification (so-called the pellet expansion) phenomena at the temperature above the m. p. of Mg was more remarkable. The density decrease was attributed to the three main factors of the pore formation, the out-growth of MgB<SUB>2</SUB> plates and the Mg evaporation during the formation reaction of MgB<SUB>2</SUB>. The microstructure investigation for the initial formation stage of MgB<SUB>2</SUB> at the temperature below the m. p. showed that the pores begun to form at the Mg/matrix interfaces and the spaces that the Mg powders occupied turned into open space (pores) gradually as a reaction time increased. This result indicates that the pores formation at the solid state (temperatures below the m. p.) is attributed to the large difference in diffusivity between Mg and B. In comparison to the solid state, the pore formation at the liquid state (temperatures above the m. p.) was attributed to the melting of Mg powders and the subsequent rapid movement of the melt due to the capillary force. Due to the faster mass transfer through the liquid, the pore formation at temperatures above the m. p. was much faster than that below the m. p. The critical current density of the MgB<SUB>2</SUB> superconductor prepared at 600<SUP>o</SUP>C was higher than that at 900<SUP>o</SUP>C owing the higher pellet density and the smaller grain size.