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Charge and Orbital-Ordering-Induced Charge-Polarized State in Bilayer Manganite
Yunsang Lee,T Arima,T Tokunaga,T Lottermoser,Y Tokura,Y. K Seo 한국물리학회 2007 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.51 No.5
We have investigated a new type of electronic charge-polarized state in bilayer manganite, Pr(Sr$_{0.1}$Ca$_{0.9}$)$_{2}$Mn$_{2}$O$_{7}$ (PSCMO). The PSCMO compound has two charge-orbital ordering (CO-OO) states with respect to the direction of the orbital stripe, which is clearly identified by addressing the optical anisotropy. Notably, a charge-polarized state is formed in the lower-temperature CO-OO state where the $c$-axis stacking patterns of the lattice and the charge modulations along the $b$-axis match with each other. We detail the correlation among the transport, the optical and the structural properties in the charge and orbital-ordering-induced charge-polarized states in bilayer manganite.
NEW TECHNOLOGY HITACHI UNINTERRUPTIBLE POWER SYSTEM
Y.Jifuku,Y.Suzuki,A.Kobayashi,T.Ito,H.Kunisada,N.Tokunaga 전력전자학회 1989 ICPE(ISPE)논문집 Vol.- No.-
With the use of uninterruptible power systems (UPS), growing rapidly, Hitachi UPS have been enhanced and expanded with a unit capacity from 1 to 600 kVA now available. In the small-capacity power systems for office automation, the low-noise compact-type HIVERTER-88 Series have been developed using MOS FET technology to increase the control carrier frequency. In the medium-capacity power systems for minicomputer and plant instrumentation applications, the stand-by type HIVERTER-850α as been developed, introducing pulse width modulation (PWM) control and integrating the commercial bypass system. For the large-capacity UPS, an computer simulation method is applied to coordinate operation with the emergency generator. And, an online-monitor system has been developed to remotely observe the UPS operation and improve the mainability.
HIGH ANGULAR RESOLUTION [Fe II] λ1.644 μ SPECTROSCOPY OF YSOS WITH SUBARU TELESCOPE
PYO TAE-SOO,HAYASHI MASAHIKO,NAOTO KOBAYASHI,TERADA HIROSHI,TOKUNAGA ALAN T. The Korean Astronomical Society 2005 Journal of The Korean Astronomical Society Vol.38 No.2
We present results of the velocity-resolved spectroscopy of the [Fe II] $\lambda$1.644${\mu}m$ emission toward outflow sources with the Subaru Telescope at the angular resolution of 0.apos;16 ${\~}$ 0.apos;5 arcseconds. The observed sources are L1551 IRS 5, DG Tau, HL Tau and RW Aur, which are located in the Taurus-Aurigae Molecular Cloud, one of the closest star forming regions (0.apos;1 = 14 AU). We were able to resolve outflow structure in the vicinity of the sources at a scale of a few tens of AU. The position-velocity diagram of each object shows two velocity components: the high velocity component (HVC: 200 - 400 km $s^{-l}$) and the low velocity component (LVC: 50 - 150 km $s^{-l}$), which are clearly distinct in space and velocity. The HVC may be a highly collimated jet presumed from its narrow velocity width and high velocity. The LVC, on the other hand, may be a widely opened disk wind inferred from its broad velocity width and low velocity. The spectrum taken perpendicular to the L1551 IRS 5 outflow at its base shows that the LVC has a spatially wide subcomponent, supporting the above interpretation. We demonstrated that the [Fe II] 1.644 $\mu$ spectroscopy is a very powerful tool for the studies of fast jets and winds that directly emanate from star-disk systems.