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Effects of La Substitution for BiFeO<sub>3</sub> Epitaxial Thin Films
K. Wakazono,Y. Kawahara,K. Ujimoto,T. Yoshimura,N. Fujimura 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.7
The relationship between the Curie temperature and the piezoelectric properties for BiFeO<sub>3</sub> epitaxial thin films was investigated by using A-site substitution of La. BiFeO<sub>3</sub> and (Bi<sub>0.9</sub>La<sub>0.1</sub>)FeO<sub>3</sub> epitaxial thin films were deposited by using pulsed laser deposition. The crystallinities, ferroelectric domain structures and piezoelectric properties for the films were investigated. Although the crystallinity was improved by La substitution, the piezoelectric properties decreased. We suggest that La substitution for BiFeO<sub>3</sub> epitaxial thin films enlarges the domain size and decreases the 71˚ domain wall, which reduce the intrinsic contribution to the piezoelectric properties.
Characteristics of second harmonic ECCD on CHS
yasuo Yoshimura,H. Matsushita,H. Igami,K. Nagasaki,K. Matsuoka,K. Ohkubo,K. Nagaoka,M. Isobe,S. Kobayashi,S. Okamura,S. Kubo,S. Nishimura,T. Minami,T. Akiyama,T. Notake,T. Shimozuma,A. Shimizu,C. Suzu 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.49 No.III
Second harmonic electron cyclotron current drive (ECCD) has been investigated on CHS (Compact Helical System) by using a 2-D steerable EC-beam injection system. The direction of the plasma current, which is the sum of bootstrap current and EC-driven current, is clearly reversed by a reversal of the EC-beam injection direction. The direction of driven current is consistent with expectation in the case of low-field side injection of EC wave. So far, a driven current up to 6 kA has been obtained when bootstrap current is less than 2 kA. It is confirmed that right-hand polarization and low density are effective for ECCD.
Studies on electron Bernstein wave heating in CHS and LHD at NIFS
Y. Yoshimura,H. Igami,S. Ferrando-Margalet,K. Nagasaki,S. Kubo,T. Shimozuma,M. Isobe,C. Suzuki,A. Shimizu,T. Akiyama,C. Takahashi,K. Nagaoka,S. Nishimura,T. Minami,K. Matsuoka,S. Okamura,T. Mutoh 한국진공학회 2007 한국진공학회 학술발표회초록집 Vol.16 No.2
H. Matubara,K. Miharu,K. Kinoshita,K. Koyama,Yang Ye,K. Takahashi,I. Yoshimura,Y. Yamamoto,Y. Miura,Y. Kinoshita 한국생약학회 1998 Natural Product Sciences Vol.4 No.3
The analogues of lichen components showing anti-tyrosinase activities were synthesized. 4-Alkylresorcinol derivatives showed both the inhibitory activity and cytotoxicity in B-16 melanona cells at the doses of 10 mM to 1.2 mM. Resorcinol and 4-methylresorcinol showed the inhibitory effect with a low cytotoxicity at the doses of 2.5 mM and 600 μM among 4-alkylresorcinols, respectively. Some diphenylmethane derivatives (Type A, B, and C) had strong activities with a low cytotoxicity. While xanthene derivatives had no effect. Glucosides of 4,5-alkylresorcinol and the diphenylmethaney derivative (Type B) were prepared to decrease the cytotoxicity. As result, no effect were observed. Liposome of the diphenylmethane derivative (Type B) was prepared for the same purpose, and the later showed a remarkable effect at the dose at 1.5 μM with a low cytotoxicity.