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THE CENTRAL REGION OF THE BARRED SPIRAL GALAXY NGC 1097 PROBED BY AKARI NEAR-INFRARED SPECTROSCOPY
Kondo, T.,Kaneda, H.,Oyabu, S.,Ishihara, D.,Mori, T.,Yamagishi, M.,Onaka, T.,Sakon, I.,Suzuki, T. The Korean Astronomical Society 2012 天文學論叢 Vol.27 No.4
With AKARI, we carried out near-infrared spectroscopy of the nearby barred spiral galaxy, NGC 1097, categorized as Seyfert 1 with a circumnuclear starburst ring. Our observations mapped the galactic center region. As a result, we obtain the spatial distributions of the polycyclic aromatic hydrocarbon $3.3{\mu}m$ and the aliphatic hydrocarbon $3.4-3.6{\mu}m$ emission. The former is detected from all the observed regions and the latter is enhanced near the bar connecting the ring with the nucleus. In addition, we detect absorption features due to $H_2O$ ice and CO/SiO at the ring and the galactic center, while we detect the hydrogen recombination line $Br{\alpha}$ only from the ring. Hence the observed spectra change dramatically within the central 1 kpc region.
H. Hyuga,M. I. Jones,K. Yoshida,N. kondo,K. Hirao,H. Kita 한양대학교 세라믹연구소 2009 Journal of Ceramic Processing Research Vol.10 No.3
The tribological behavior of monolithic Si3N4 and solid lubricants dispersed Si3N4-based composites has been assessed under a high load and low speeds in an aqueous environment. The results showed that the friction coefficient of the Si3N4 was not significantly reduced when compared to dry sliding and this was attributed to the failure to maintain a lubricating layer between the solid-solid surfaces. In the case of the composites, the initial high friction coefficient was reduced shortly after the beginning of the wear test and maintained a low value (approximately 0.03) throughout. This was attributed to the solid lubricating effect of the composite resulting in a lower stress at the contact asperities preventing the removal of the lubricating layer. The solid lubricant content did not affect the value of the friction coefficient under hydrodynamic type lubrication, but the running in distance decreased with the solid lubricant dispersion. The type and amount of solid lubricant affected the distance required to reach a low friction regime, but all types of solid lubricant showed decreasing friction with increasing amount. In Stribeck analysis, the addition of the solid lubricant resulted in a highly graphitic transfer layer on the Si3N4 material, and shifted the transition points from hydrodynamic to mixed and from mixed to boundary lubrication regimes to more severe conditions. It also reduced the friction coefficient in the boundary lubrication regime. The tribological behavior of monolithic Si3N4 and solid lubricants dispersed Si3N4-based composites has been assessed under a high load and low speeds in an aqueous environment. The results showed that the friction coefficient of the Si3N4 was not significantly reduced when compared to dry sliding and this was attributed to the failure to maintain a lubricating layer between the solid-solid surfaces. In the case of the composites, the initial high friction coefficient was reduced shortly after the beginning of the wear test and maintained a low value (approximately 0.03) throughout. This was attributed to the solid lubricating effect of the composite resulting in a lower stress at the contact asperities preventing the removal of the lubricating layer. The solid lubricant content did not affect the value of the friction coefficient under hydrodynamic type lubrication, but the running in distance decreased with the solid lubricant dispersion. The type and amount of solid lubricant affected the distance required to reach a low friction regime, but all types of solid lubricant showed decreasing friction with increasing amount. In Stribeck analysis, the addition of the solid lubricant resulted in a highly graphitic transfer layer on the Si3N4 material, and shifted the transition points from hydrodynamic to mixed and from mixed to boundary lubrication regimes to more severe conditions. It also reduced the friction coefficient in the boundary lubrication regime.
S. Kondo,T. Nakanish,T. Saito,H. Nakagawa,H. Asada,K. Takahashi 한국물리학회 2007 Current Applied Physics Vol.7 No.1
Photoluminescence of microcrystalline CsPbBr3 lms grown from the amorphous phase shows stimulated emission not only at cryo-3 single crystals, where no stimulated emis-sion occurs even at 4.2 K. This is the rst demonstration of room temperature stimulated emission from metal halide compounds.The stimulated emission is so strong that single-path-light-amplication stimulated emission across the lm thickness is observed atrelatively low threshold excitation intensities of. 50 kW cm. 2 at 77 K and . 100 kW cm. 2 at 295 K suggesting a large optical gain. Theattributable to giant oscillator strength eect characteristic of excitonic superradiance recently reported in this issue.
Structural control of organic conductors by uniaxial strain: θ- and α-phases of BEDT-TTF compounds
R. Kondo,S. Kagoshima,M. Chusho,H. Hoshino,T. Mori,H. Mori,S. Tanaka 한국물리학회 2002 Current Applied Physics Vol.2 No.6
The crystalline and electronic structures of thea-phase BEDT-TTF organic superconductors were controlled by the uniaxiala-axiswhile thec-axis compression reduced the bandwidth. Similar controls were possible also in theh-phase compounds. Thea-axiscompression made the material metallic although thec-axis one insulating. It is possible to systematically explain these changes inelectronic properties under the uniaxial compression in terms of the changes in the electronic band structure in the conducting layer.. 2002 Elsevier Science B.V. All rights reserved.
S.Kondo,H.Nakagawa,T.Saito,H.Asada 한국물리학회 2004 Current Applied Physics Vol.4 No.5
The compounds CsPbCl3 and CsPbBr3, which are known to be one of the most luminescent semiconductors, show enhancedphotoluminescence for thin lms prepared by crystallization from the amorphous phase into microcrystalline/polycrystalline states.The microcrystalline state shows more than an order of magnitude stronger free-exciton emission than the polycrystalline state, aswell as than bulk single crystal.A possible explanation for this phenomenon is given in terms of excitonic superradiance.The extreme radiance of the thin-lm samples is fascinating when considering application in opto-electronic micro-devices.