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Single crystal growth of nanoporous C12A7:e- by controlling melt state.
Yoon, S G,Kim, S W,Yoon, D H,Hirano, M,Hosono, H American Scientific Publishers 2009 Journal of Nanoscience and Nanotechnology Vol.9 No.12
<P>It has been known that electron doped 12CaO x 7Al2O3 (C12A7:e-, electride) single crystals, which are composed of a closed-packed periodic quantum dot structure, may be prepared by strong reduction of the precursor C12A7:O2-, but direct single crystal growth of the C12A7:e- from the melt state has never been achieved to date. We report the melt state of polycrystalline electride in pure dry Ar atmosphere at temperatures of 1290 approximately 1500 degrees C, which leads to the direct single crystal growth of the C12A7:e- from the melt. The electride single crystals with a diameter of 7 mm and a length of 43 mm have been grown by a floating zone method, where a polycrystalline electride feed and an electride single crystal seed rod were employed. The electron concentration in the crystal increased up to approximately 1.0 x 10(20) cm(-3) as the growth proceeded. The present findings suggest that electron-entrapped local structure may exist in the melt and the electrons may act as a template for the formation of C12A7 electride in the solidification process of the C12A7 lattice.</P>
Effeets of Local Damage on Asymptotic Stress Field of a Growing Creep Crack
Murakami, S .,Liu, Y .,Hirano, T .,Mizuno, M . 대한금속재료학회(대한금속학회) 1998 METALS AND MATERIALS International Vol.4 No.3
A parametric study on the effects of local damage field on the crack-tip stress field of a growing Mode I creep crack is performed in the framework of Continuum Damage Mechanics (CDM). According to the results of creep crack growth analysis based on CDM and Finite Element Method, the damage distribution 1-(D/D_(cr))=h(θ)r^m represented by a power law function of the radius r from the crack tip is postulated for the damage variable D. The damage effects are incorporated into the Norton creep law by means of the hypothesis of strain equivalence of CDM. The resulting two-point boundary value problems of differential equations for the growing creep cracks in the states of plane strain and plane stress are solved by means of a shooting method. For a given creep exponent n of the Norton law, the exponent p of the asymptotic stress field σ_(ij) ∝ r^n is found to be governed by the exponent m of the power law damage distribution r^m.
Y. Liu,S. Hashimoto,K. Yasumoto,K. Takei,M. Mori,Y. Funahashi,Y. Fijishiro,A. Hirano,Y. Takeda 한국물리학회 2009 Current Applied Physics Vol.9 No.11
The catalytic activity of the La0.6Sr0.4CoxFe1-xO3-δ (x = 0.2) perovskite cathode was significantly improved by introducing Ag. This strongly depends on the particle size of Ag that relates to the synthesis route. The Ag particles in nano-range were in situ incorporated into the La0.6Sr0.4Co0.2Fe0.8O3-δ based cathode using a novel infiltration. The functional cathode was successfully operated on the anode-supported cell with a ceria thin-electrolyte resulting in a higher cell output at 500 ℃. Durability of the cell was evaluated within a short-term period. The catalytic activity of the La0.6Sr0.4CoxFe1-xO3-δ (x = 0.2) perovskite cathode was significantly improved by introducing Ag. This strongly depends on the particle size of Ag that relates to the synthesis route. The Ag particles in nano-range were in situ incorporated into the La0.6Sr0.4Co0.2Fe0.8O3-δ based cathode using a novel infiltration. The functional cathode was successfully operated on the anode-supported cell with a ceria thin-electrolyte resulting in a higher cell output at 500 ℃. Durability of the cell was evaluated within a short-term period.
Iida, M.,Fujii, S.,Uchida, M.,Nakamura, H.,Kagami, Y.,Agusa, T.,Hirano, M.,Bak, S.M.,Kim, E.Y.,Iwata, H. Elsevier/North Holland Biomedical Press 2016 Aquatic toxicology Vol.177 No.-
<P>2,3,7,8-Tetrachlorodibenzo-p-dioxin (TCDD) induces a broad spectrum of toxic effects including craniofacial malformation and neural damage in fish embryos. These effects are mainly mediated by the aryl hydrocarbon receptor (AHR). However, the mode of action between TCDD-induced AHR activation and adverse outcomes is not yet understood. To provide a comprehensive picture of the AHR signaling pathway in fish embryos exposed to TCDD, red seabream (Pagrus major) embryos were treated with graded concentrations of TCDD (0.3-37 nM) in seawater, or with a mixture of TCDD and 500 nM CH223191, an AHR-specific antagonist. The transcriptome of red seabream embryos was analyzed using a custom-made microarray with 6000 probes specifically prepared for this species. A Jonckheere-Terpstra test was performed to screen for genes that demonstrated altered mRNA expression levels following TCDD exposure. The signals of 1217 genes (as human homologs) were significantly altered in a TCDD concentration-dependent manner (q-value < 0.2). Notably, the TCDD-induced alteration in mRNA expression was alleviated by co-exposure to CH223191, suggesting that the mRNA expression level of these genes was regulated by AHR. To identify TCDD-activated pathways, the microarray data were further subjected to gene set enrichment analysis (GSEA) and functional protein-protein interaction (PPI) network analysis. GSEA demonstrated that the effects of TCDD on sets of genes involved calcium, mitogen-activated protein kinase (MAPK), actin cytoskeleton, chemokine, T cell receptor, melanoma, vascular endothelial growth factor (VEGF), axon guidance, and renal cell carcinoma signaling pathways. These results suggest the hypotheses that TCDD induces immunosuppression via the calcium, MAPK, chemokine, and T cell receptor signaling pathways, neurotoxicity via VEGF signaling, and axon guidance alterations and teratogenicity via the dysregulation of the actin cytoskeleton and melanoma and renal cell carcinoma signaling pathways. Furthermore, the PPI network analysis indicated that the adverse outcome pathways of TCDD in the embryos might be propagated through several hub genes such as cell division control protein 42, phosphoinositide-3-kinase regulatory subunit 1, and guanine nucleotide binding proteins. Understanding these pathways potentially allows for exploring the adverse outcome pathway of the effects of TCDD on the red seabream embryos. (C) 2016 Elsevier B.V. All rights reserved.</P>
Abe, K.,Hieda, K.,Hiraide, K.,Hirano, S.,Kishimoto, Y.,Kobayashi, K.,Moriyama, S.,Nakagawa, K.,Nakahata, M.,Ogawa, H.,Oka, N.,Sekiya, H.,Shinozaki, A.,Suzuki, Y.,Takeda, A.,Takachio, O.,Ueshima, K.,Um North-Holland Pub. Co 2013 Physics letters: B Vol.719 No.1
A search for light dark matter using low-threshold data from the single phase liquid xenon scintillation detector XMASS, has been conducted. Using the entire 835 kg inner volume as target, the analysis threshold can be lowered to 0.3 keVee (electron-equivalent) to search for light dark matter. With low-threshold data corresponding to a 5591.4 kg@?day exposure of the detector and without discriminating between nuclear-recoil and electronic events, XMASS excludes part of the parameter space favored by other experiments.
Measurement of Deuteron Induced Thick Target Neutron Yields at 9 MeV
N. Shigyo,K. Hidaka,K. Hirabayashi,Y. Nakamura,D. Moriguchi,M. Kumabe,H. Hirano,S. Hirayama,Y. Naitou,C. Motooka,C. Lan,T. Watanabe,Y. Watanabe,K. Sagara,S. Maebaru,H. Sakaki,H. Takahashi 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.23
The double differential thick target neutron yields from 9 MeV deuteron incidence were measured at the Kyushu University Tandem Accelerator Laboratory. A copper and a titanium foils which are thick enough for a deuteron to stop in the foils were placed at the center of a vacuum chamber. An NE213 liquid organic scintillator was employed to detect neutrons emitted from targets and placed at 9 directions from 0˚ to 140˚. To consider the contribution of scattered neutrons from the floor, we also measured neutron yields with an iron shadow bar located in front of the scintillator. Because incident deuteron beam was not pulsed and the Time-of-Flight method was not applied, the energy spectrum was derived from unfolding the light output spectrum using the FORIST code. The detection efficiency was calculated with the SCINFUL-QMD code. The experimental results were compared with the calculation data of the TALYS code, and it turned out that the calculation data does not reproduce the experimental ones satisfactorily.