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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.
Search for dark matter WIMPs using upward through-going muons in Super-Kamiokande
Desai, S.,Ashie, Y.,Fukuda, S.,Fukuda, Y.,Ishihara, K.,Itow, Y.,Koshio, Y.,Minamino, A.,Miura, M.,Moriyama, S.,Nakahata, M.,Namba, T.,Nambu, R.,Obayashi, Y.,Sakurai, N.,Shiozawa, M.,Suzuki, Y.,Takeuch American Physical Society 2004 PHYSICAL REVIEW D - Vol.70 No.8
SUPER LOW SPEED CONTROL FOR LIM
Y.Ogino,K.Abe,K.Ohishi,M.Nakaoka,H.Fukuda,Y.Takakado,K.Nakano,Y.Murakami 전력전자학회 1992 ICPE(ISPE)논문집 Vol.1992 No.4
This paper proposes the super low speed control method for LIM (Linear Induction Motor). The feasibly-proposed control method is based on the vector-control strategy using the current controlled VVVF inverter. Using this control implementation, both the quick speed response and the smooth thrust characteristics are realized in the super low speed range. The experimental results provide its desired operating characteristics in this system.<br/>
Review and Prospect of Ferroelectricity and Magnetism in YMn2O5
Y. Noda,H. Kimura,I. Kagomiya,K. Kohn,N. Ikeda,S. Matumoto,T. Shobu,Y. Fukuda 한국물리학회 2003 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.42 No.IV
YMn2O5 undergoes ferroelectric successive phase transitions at 39 K and 19 K, in which a dielectric constant shows anomalies. Spontaneous polarization was also observed. Just above these ferroelectric phase transition temperatures, at 45 K, antiferromagnetic order occurs. Neutron elastic measurements and magnetic susceptibility measurements reveal that the ferroelectric phase transition at 39 K and 19 K occurs simultaneously with the change of magnetic ordering pattern. Review of experimental results and conjecture for the origin of spontaneous polarization are given.??
K. Tahara,Y. Fukuda,G. Wakabayashi,H. Ban,Y. Morimoto,M. Yoshioka,K. Kiyohara,Y. Koba,H. Iwamoto,Y. Uozumi,N. Matsufuji 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.23
We measured proton-production double differential cross sections (DDXs) by 290 MeV/u carbon beams on carbon, copper, lead targets at forward angles. The proton energies were measured with the spectrometer which consisted of GSO(Ce) crystals and plastic scintillators. The measured DDXs were compared with the calculated ones with PHITS code. The simulation results generally agreed with the measured ones. The measured results will be useful as the benchmark of existing simulation codes and for the future improvements.
Gut commensal Bacteroides acidifaciens prevents obesity and improves insulin sensitivity in mice
Yang, J-Y,Lee, Y-S,Kim, Y,Lee, S-H,Ryu, S,Fukuda, S,Hase, K,Yang, C-S,Lim, H S,Kim, M-S,Kim, H-M,Ahn, S-H,Kwon, B-E,Ko, H-J,Kweon, M-N Society for Mucosal Immunology 2017 Mucosal immunology Vol.10 No.1
<P>In humans, the composition of gut commensal bacteria is closely correlated with obesity. The bacteria modulate metabolites and influence host immunity. In this study, we attempted to determine whether there is a direct correlation between specific commensal bacteria and host metabolism. As mice aged, we found significantly reduced body weight and fat mass in Atg7(Delta CD11c) mice when compared with Atg7(f/f) mice. When mice shared commensal bacteria by cohousing or feces transfer experiments, body weight and fat mass were similar in both mouse groups. By pyrosequencing analysis, Bacteroides acidifaciens (BA) was significantly increased in feces of Atg7(Delta CD11c) mice compared with those of control Atg7(f/f) mice. Wild-type C57BL/6 (B6) mice fed with BA were significantly more likely to gain less weight and fat mass than mice fed with PBS. Of note, the expression level of peroxisome proliferator-activated receptor alpha (PPARa) was consistently increased in the adipose tissues of Atg7(Delta CD11c) mice, B6 mice transferred with fecal microbiota of Atg7(Delta CD11c) mice, and BA-fed B6 mice. Furthermore, B6 mice fed with BA showed elevated insulin levels in serum, accompanied by increased serum glucagon-like peptide-1 and decreased intestinal dipeptidyl peptidase-4. These finding suggest that BA may have potential for treatment of metabolic diseases such as diabetes and obesity.</P>
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.
Invariant Mass Spectroscopy for the Neutron Rich Nuclei
사토,추경호,방형찬,S. H. Choi,T. Nakamura,Y. Kondo,Y. Nakayama,N. Kobayashi,K. N. Tanaka,S. Deguchi,Y. Kawada,N. Tanaka,T. Sugimoto,T. Motobayashi,H. Sakurai,H. Otsu,N. Aoi,Y. Yanagisawa,S. Takeuchi,N. Fukuda 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.23
The neutron-rich carbon isotopes ^(19,17)C and a boron isotope ^(14)B are investigated respectively via proton inelastic and charge-exchange reactions on a liquid hydrogen target at around 70 MeV/nucleon at RIKEN. The invariant mass method in inverse kinematics involving coincidence detection of a charged fragment and a neutron both emitted at forward angles is employed to map the energy spectrum above the neutron decay threshold. Several resonance structures are revealed in the invariant mass spectra, and the nature for some of them is discussed from comparisons of differential cross section data with predictions of microscopic DWBA calculations based on spsdpf shell model wave functions and a recent parametrization of semi-microscopic nucleon-nucleus optical model potential (JLMB). By extrapolating the (p,n) cross sections leading to the 1^+ state at 1.27 MeV in ^(141)B to zero momentum transfer the Gamow-Teller transition strength is deduced. The value is found to compare well with that reported in a β-delayed neutron emission study.
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>