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Structure and Atomic Displacement in Micro-Pulling Down Crystals of Potassium Lithium Niobate
Yoon, D . H .,Suh, S . J .,Shur, C . C .,Hong, B .,Fukuda, T . 대한금속재료학회(대한금속학회) 1999 METALS AND MATERIALS International Vol.5 No.3
To reveal the effects of compositional changes in the structure of potassium lithium niobate (K₃Li_(2-x)Nb_(5-x)O_(15)) grown by the micro-pulling down (μ-PD) method, the structure and polar atomic displacements of the metal atoms were studied by X-ray analysis. The polar components of the atomic displacement of the metal atoms Nb(1) and Nb(2) was determined to be 0.193 and 0.186 , 0.162 and 0.154 , and 0.115 and 0.114 for melt compositions of x=-0.3, 0, and +0.3, respectively. It was shown that the displacements of the Nb sites increased as the Nb content decreased.
Hasegawa, K.,Yoshikawa, A.,Durbin, S.D.,Epellbaum, B.M.,Fukuda, T.,Waku, Y. The Korea Association of Crystal Growth 1999 韓國結晶成長學會誌 Vol.9 No.4
Fiber growth of $Al_{2}O_{3}/R-Al-O$ (R = Y, Gd, Dy, Ho, Er) eutectic by the micro-pulling down method is described. The thermal stability and strength at elevated temperature of each materials is evaluated in relation to the microstructure.
Lee, J.H.,Yoshikawa, A.,Kaiden, H.,Fukuda, T.,Yoon, D.H.,Waku, Y. The Korea Association of Crystal Growth 2001 한국결정성장학회지 Vol.11 No.4
It was possible to grow the $Al_{2}O_{3}$ based $Y_{3}A_{5}O_{12}(YAG),ZrO_{2}$ binary and ternary eutectic fibers using micro-pulling down method with a growing rate of 0.1~15 mm/min. While $Al_{2}O_{3}/ZrO_{2}$ showed cellular-lamellar structure, $Al_{2}O_{3}$/YAG and $Al_{2}O_{3}$/YAG/$ZrO_{2}$ternary eutectic fibers showed homogeneous Chinese script lamellar structures. The microstructures of $Al_{2}O_{3}/ZrO_{2}$ binary eutectic fibers changed with solidification rate from lamellar pattern to cellular structure. The interlamellar spacing agreed with the inverse-square-root dependance on pulling rate according to $\lambda$=$kv_p\;{-1/2}$. $Al_{2}O_{3}/ZrO_{2}$ binary eutectic fibers recorded the highest tensile strength of about 1560MPa at room temperature. $Al_2O_3/YAG/ZrO_2$ternary eutectic fiber showed excellent thermal stability to $1200^{\circ}C$ without significant decrease. The maximum strength of ternary eutectic fibers recorded were 1100MPa at $25^{\circ}C$ and 970MPa at $1200^{\circ}C$, respectively.
Σ-nucleus potential studied with the(π−,K+)reaction on medium-to-heavy nuclear targets
Saha, P. K.,Noumi, H.,Abe, D.,Ajimura, S.,Aoki, K.,Bhang, H. C.,Dobashi, K.,Endo, T.,Fujii, Y.,Fukuda, T.,Guo, H. C.,Hashimoto, O.,Hotchi, H.,Imai, K.,Kim, E. H.,Kim, J. H.,Kishimoto, T.,Krutenkova, A American Physical Society 2004 PHYSICAL REVIEW C - Vol.70 No.4
( H. M. Kim ),( S. H. Cho ),( D. Fukuda ),( K. Kaneko ),( Y. Nakamura ),( H. S. Kim ),( J. H. Lee ) 대한지질공학회 2016 대한지질공학회 학술발표회논문집 Vol.2016 No.1
Breakage of concrete structures involves a risk the occupational health of those involved in the operation and other general public living in the vicinity due to the noise hazard. It is important to prevent damage from mechanical breakage method to remaining concrete structures, while obtaining efficient resultant fracture are of considerable importance for partially dismantling concrete structures, Therefore, alternative method has been needed to solve these problem. Nakamura et al. (2004) suggested a dynamic breakage system installed utilizing wedged charge holder before curing time of concrete specimen to remove the partial concrete block in short time. Nakamura et al. (2010) was performed to investigate the effect of the charge holder on the fracture plane formation in field-scale blast experiment. This study proposes a numerical method to simulate crack propagation in the field-scale concrete block by means of blasting method. The result shown that the smooth blasting was obtained along the optimal fracture plane was shown in remaining part of concrete specimen. As the field-scale experimental result, the dynamic fracture process analysis(DFPA) (Cho, 2003) assuming the same experimental arrangement was conducted and the fracture mechanism was investigated. Figure 1 shows the finite element layout for the analysis model which has all free face and 2 charge holders installed. the model was divided into triangular elements. The analysis model applied calculation conditions in Table 1.
Fujitani, K.,Yang, H.-K.,Kurokawa, Y.,Park, D. J.,Tsujinaka, T.,Park, B.-J.,Fukuda, H.,Noh, S. H.,Boku, N.,Bang, Y.-J.,Sasako, M.,Lee, J.-I. Oxford University Press 2008 Japanese journal of clinical oncology Vol.38 No.7
<P>A randomized controlled trial has started in both Japan and Korea to evaluate the role of gastrectomy in the management of incurable advanced gastric cancer (AGC). Patients with AGC diagnosed as having a single non-curable factor are randomized to gastrectomy plus chemotherapy or chemotherapy alone. Surgeons at 33 specialized centers in Japan and at 15 high-volume hospitals in Korea will recruit 330 patients. Primary end-point is overall survival, and secondary end-points are progression-free survival and adverse events associated with either gastrectomy or chemotherapy.</P>
I. C. Robin,A. Jouini,C. Tavares,J. Rothman,G. Feuillet,D. Ehrentraut,T. Fukuda 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.5
Homoepitaxial layers grown by liquid phase epitaxy on hydrothermally grown ZnO bulk wafers are studied by means of temperature-dependent photoluminescence. The properties of the films are compared to those of hydrothermal ZnO substrates. The effect of Ga doping is studied. Liquid phase epitaxy is shown to be a promising method for achieving substantial variations of the electrical and the luminescent properties of ZnO.
Nakayama, S.,Mauger, C.,Ahn, M.H.,Aoki, S.,Ashie, Y.,Bhang, H.,Boyd, S.,Casper, D.,Choi, J.H.,Fukuda, S.,Fukuda, Y.,Gran, R.,Hara, T.,Hasegawa, M.,Hasegawa, T.,Hayashi, K.,Hayato, Y.,Hill, J.,Ichikawa Elsevier 2005 Physics letters: B Vol.619 No.3
<P><B>Abstract</B></P><P>Neutral current single <SUP>π0</SUP> production induced by neutrinos with a mean energy of 1.3 GeV is measured using a 1000 ton water Cherenkov detector in the K2K long baseline neutrino experiment. The cross section for this process relative to the total charged current cross section is measured to be 0.064±0.001(stat.)±0.007(sys.). The momentum distribution of neutral current <SUP>π0</SUP>s from a water target is measured with high statistics for the first time.</P>