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Shiraiwa, Masahiro,Fujii, Kotaro,Esaki, Yuichi,Kim, Su Jae,Lee, Seongsu,Yashima, Masatomo Electrochemical Society 2017 Journal of the Electrochemical Society Vol.164 No.13
<P>BaNdInO4 is a new structure family of oxide-ion conductors. In the present work, we have investigated the crystal structure and electrical conductivity of Ba1+xNd1-xInO4-x/2 where x is the excess Ba content. It was found that Ba1.1Nd0.9InO3.95 shows (i) about 12 times higher oxide-ion conductivity at 858 degrees C and (ii) a little lower activation energy for oxide-ion conduction than BaNdInO4. The higher oxide-ion conductivity of Ba1.1Nd0.9InO3.95 is mainly ascribed to higher carrier concentration. Careful structure analyses using both the single-crystal X-ray diffraction and time-of-flight (TOF) neutron powder diffraction data enabled to determine the position of excess Ba cation and occupancy factor of O anion. It was found that the excess Ba cation substitutes for Nd cation and that oxygen vacancies exist in Ba1.1Nd0.9InO3.95. The refined occupancy factor of oxygen atom 0.9829(17) indicates the higher concentration of oxygen vacancies in Ba1.1Nd0.9InO3.95, compared with BaNdInO4, giving higher oxide-ion conductivity in Ba1.1Nd0.9InO3.95. The larger-sized Ba substitution for Nd cation makes the bottleneck size larger, leading to the lower activation energy. The bond valence-based energy landscape calculated for the refined crystal structure of Ba1.1Nd0.9InO3.95 at 800 and 24 degrees C indicated two-dimensional oxide-ion diffusion in the A rare earth oxide (Nd, Ba)(2)O-3 unit on the bc plane. (c) 2017 The Electrochemical Society. All rights reserved.</P>
Nam, Onyou,Shiraiwa, Yoshihiro,Jin, EonSeon The Korean Society of Phycology 2018 ALGAE Vol.33 No.2
Emiliania huxleyi (a haptophyte) is the most abundant coccolithophore species that produces delicate calcite scales called coccoliths. In this study, we identified several candidate genes associated with coccolith production by comparing the transcriptomes of the calcifying (CCMP 371) and non-calcifying (CCMP 2090) strains of E. huxleyi. Among the candidates, genes highly expressed in CCMP 371 were identified. To confirm whether these genes are associated with calcification, we modulated coccolith production in CCMP 371 by culturing it at different calcium concentrations. At an ambient (10 mM) concentration of calcium in the growth medium, CCMP 371 sustained its calcifying ability. However, at a low (0.1 mM) concentration or absence of calcium, there was no calcite formation, demonstrating that calcium-limiting conditions negatively affect calcification. We also evaluated the expression patterns of the putative genes in cells grown at different calcium concentrations by quantitative reverse transcription polymerase chain reaction. In addition, we showed that the growth rate of cells cultured under calcium-limiting conditions does not differ from that under ambient conditions. Further studies are required to investigate the roles of the putative calcification-associated genes at the molecular level.
Improved oxide-ion conductivity of NdBaInO<sub>4</sub> by Sr doping
Fujii, Kotaro,Shiraiwa, Masahiro,Esaki, Yuichi,Yashima, Masatomo,Kim, Su Jae,Lee, Seongsu The Royal Society of Chemistry 2015 Journal of Materials Chemistry A Vol.3 No.22
<▼1><P>The oxide-ion conductivity of NdBaInO4 has been increased by Sr doping.</P></▼1><▼2><P>The oxide-ion conductivity of NdBaInO4 has been increased by Sr doping. Nd0.9Sr0.1BaInO3.95 showed the highest electrical conductivity among Nd1−xSrxBaInO4−x/2 (<I>x</I> = 0.0, 0.1, 0.2, and 0.3). The oxide-ion conductivity <I>σ</I>ion of Nd0.9Sr0.1BaInO3.95 (<I>σ</I>ion = 7.7 × 10<SUP>−4</SUP> S cm<SUP>−1</SUP>) is about 20 times higher than that of NdBaInO4 (<I>σ</I>ion = 3.6 × 10<SUP>−5</SUP> S cm<SUP>−1</SUP>) at 858 °C, and the activation energy of oxide-ion conduction is a little lower for Nd0.9Sr0.1BaInO3.95 (0.795(10) eV) than that for NdBaInO4 (0.91(4) eV). The structure analysis based on neutron powder diffraction data revealed that the Sr exists at the Nd site and oxygen vacancies are observed in Nd0.9Sr0.1BaInO3.95. This result indicates that the increase of the oxide-ion conductivity is mainly due to the increase of the carrier concentration. The bond valence-based energy landscape indicated two-dimensional oxide-ion diffusion in the (Nd,Sr)2O3 unit on the <I>bc</I>-plane and a decrease of the energy barrier by the substitution of Nd with Sr cations.</P></▼2>
남온유,Yoshihiro Shiraiwa,진언선 한국조류학회I 2018 ALGAE Vol.33 No.2
Emiliania huxleyi (a haptophyte) is the most abundant coccolithophore species that produces delicate calcite scales called coccoliths. In this study, we identified several candidate genes associated with coccolith production by comparing the transcriptomes of the calcifying (CCMP 371) and non-calcifying (CCMP 2090) strains of E. huxleyi. Among the candidates, genes highly expressed in CCMP 371 were identified. To confirm whether these genes are associated with calcification, we modulated coccolith production in CCMP 371 by culturing it at different calcium concentrations. At an ambient (10 mM) concentration of calcium in the growth medium, CCMP 371 sustained its calcifying ability. However, at a low (0.1 mM) concentration or absence of calcium, there was no calcite formation, demonstrating that calciumlimiting conditions negatively affect calcification. We also evaluated the expression patterns of the putative genes in cells grown at different calcium concentrations by quantitative reverse transcription polymerase chain reaction. In addition, we showed that the growth rate of cells cultured under calcium-limiting conditions does not differ from that under ambient conditions. Further studies are required to investigate the roles of the putative calcification-associated genes at the molecular level.
Simulation study of proposed off-midplane lower hybrid current drive in KSTAR
Bae, Young-soon,Shiraiwa, S,Bonoli, P,Wallace, G,Wright, J C,Parker, R,Kim, J H,Namkung, W,Cho, M H,Park, B H,Yoon, S W,Oh, Y K,Park, H IOP 2016 Plasma physics and controlled fusion Vol.58 No.7
<P>A new proposal of lower hybrid (LH) wave launching is studied for efficient current drive aiming for high performance H-mode operation in Korea Superconducting Tokamak Advanced Research (KSTAR). This new concept is the off-midplane launch which results in a rapid up-shift of the parallel component of refractive index and hence simultaneously maintains good wave accessibility and efficient single pass absorption via Landau damping. In order to locate an optimal position of the launcher in the poloidal direction, the ray-tracing and Fokker–Planck codes were used. Based on a survey of the LH wave launch parameters and operation conditions including the compatibility issues with the existing in-vessel components, the LH wave launch from the top position near the upper <I>X</I>-point of the plasma separatrix provides the possibility to eliminate the accessibility problem and reduce parasitic edge loss for the KSTAR high performance H-mode operation scenario using 5 GHz lower hybrid current drive.</P>