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Shotaro Ishikawa,Yuuki Kitanaka,Takeshi Oguchi,Yuji Noguchi,Masaru Miyayama,Chikako Moriyoshi,Yoshihiro Kuroiwa 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.7
Domain structures and dynamics of BaTiO<SUB>3</SUB> single crystals under in-situ electric fields along <101> were investigated by using synchrotron radiation single-crystal X-ray diffractions. Diffraction patterns clearly show the presence of a 90 o domain structure in crystals poled along <101>. The linear characteristics of strain and polarization with unipolar electric fields along <101> suggested that the 90˚ domain structures established by poling treatments do not change by applying electric fields. The diffraction analysis, however, provides direct evidence of a reversible change in the volume fractions of two kinds of the 90˚ domains under unipolar in-situ electric fields.
Defect control for polarization switching in BiFeO<sub>3</sub> single crystals
Chishima, Yuji,Noguchi, Yuji,Kitanaka, Yuuki,Miyayama, Masaru IEEE 2010 and Frequency Control Vol.57 No.10
<P>BiFeO<SUB>3</SUB> (BFO) single crystals were grown and the effects of Zn and Mn co-doping on the polarization and leakage current properties were investigated at 25°C for establishing materials design based on defect chemistry. Although Zn doping or Mn doping led to a deterioration in the properties, Zn-Mn co-doping led to a large remanent polarization (36 μC/cm<SUP>2</SUP>), a low coercive field (19 kV/cm), and a relatively low leakage current density (~10<SUP>-8</SUP> A/cm<SUP>2</SUP>). It is proposed that defect dipoles composed of Zn<SUP>2+</SUP> and Mn<SUP>4+</SUP> act as effective nucleation sites for ferroelectric domains during polarization switching in BFO crystals.</P>
Ken Yanai,Hiroaki Onozuka,Yuuki Kitanaka,Yuji Noguchi,Masaru Miyayama,Chikako Moriyoshi,Yoshihiro Kuroiwa,Kousuke Kurushima,Shigeo Mori 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.7
Single crystals of ferroelectric (Bi<SUB>0.5</SUB>Na<SUB>0.5</SUB>)TiO<SUB>3</SUB> were successfully grown by the top-seeded solution growth method at a high oxygen pressure of 0.9쟋Pa and their polarization switching dynamics along <100><SUB>c</SUB> and their domain structures were investigated. Piezoelectric force microscope (PFM) observations show that BNT crystals poled along <100><SUB>c</SUB>. had 71-degree domains in which the spontaneous polarization (<I>P</I><SUB>s</SUB>) vector is opposite to the poling electric fields. Synchrotronradiation single-crystal X-ray diffraction analyses and the PFM observations reveal that the polarization switching in the BNT crystals along <100><SUB>c</SUB> is achieved by a 71-degree rotation of the <I>P</I><SUB>s</SUB> vector.
Kenichi Iimori Katuji Shinohar,Mitsuhiro Muroya,Hidetoshi Kitanaka 전력전자학회 1998 ICPE(ISPE)논문집 Vol.- No.-
The voltage-source inverters are normally equipped with an electrolytic capacitor in their DC link, however, the electrolytic capacitor has several disadvantages such as increasing size, limiting converter life and reliability. Therefore, several approaches for removing the DC link capacitor have been studied by the authors. This paper proposes a new voltage-source inverter without DC link components. To reduce waveform distortion of the AC source current, the current-controlled PWM-rectifier with di/dt feedback is introduced. The di/dt feedback gain and LC parameters are investigated by calculation for a 0.75kW induction motor driven by this inverter. The calculated AC source currents maintain nearly sinusoidal waveforms with a unity power factor.<br/>
Yasuaki Fukuda,Masahiro Kanbe,Manami Watanabe,Katsuaki Dan,Keiichi Matsuzaki,Susumu Kitanaka,Shohei Miyata 대한약학회 2013 Archives of Pharmacal Research Vol.36 No.8
We have previously reported that many ingenolcompounds derived from Euphorbia kansui exhibit topoisomerase(topo) II inhibitory activity. Of these compounds,3EZ,20Ac-ingenol inhibited topo I activity. Camptothecin,which inhibits the religation activity of topo I withoutinterfering with the binding of topo I to DNA and inducestopo I-mediated DNA cleavage, was used as a positivecontrol. In this study, we found that 3EZ,20Ac-ingenol didnot hamper the binding of topo I to DNA in the samemanner as camptothecin but affected the inhibition ofcleavage of one DNA strand. 3EZ,20Ac-ingenol inhibitedcell proliferation by blocking cell cycle progression in theG2/M phase. To define the mechanism of inhibition ofDT40 cell proliferation, the change in Akt activity wasobserved because Akt activity is regulated in response toDNA damage. Western blot analysis revealed that3EZ,20Ac-ingenol downregulated the expression of p-Akt,and apoptosis was detected by the presence of DNA double-strand breaks and caspase 3 activation.