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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.
Mori, T.I.,Sakon, I.,Onaka, T.,Umehata, H.,Kaneda, H.,Ohsawa, R. The Korean Astronomical Society 2012 天文學論叢 Vol.27 No.4
We present the results of the near-infrared (NIR) to mid-infrared (MIR) slit spectroscopic observations of the diffuse emission toward nine positions in the nearby irregular galaxy Large Magellanic Cloud (LMC) with the Infrared Camera (IRC) on board AKARI. The unique characteristic of AKARI/IRC provides a great opportunity to analyze variations in the unidentified infrared (UIR) bands based on continuous spectra from 2.5 to $13.4{\mu}m$ of the same slit area. The observed variation of $I_{3.3}/I_{11.3}$ suggests destruction of small-sized UIR band carriers, polycyclic aromatic hydrocarbons (PAHs) in harsh environments. This result demonstrates that the UIR $3.3{\mu}m$ band provides us powerful information on the excitation conditions and/or the size distribution of PAHs, which is of importance for understanding the evolutionary process of hydrocarbon grains in the Universe. It also suggests a new diagnostic diagram of two band ratios, such as $I_{3.3}/I_{11.3}$ versus $I_{7.7}/I_{11.3}$, for the interstellar radiation conditions. We discuss on the applicability of the diagnostic diagram to other astronomical objects, comparing the LMC results with those observed in other galaxies such as NGC 6946, NGC 1313, and M51.
Mori, F.,Sawada, K.,Watanabe, K.,Ducusin, R.J.T.,Kumase, N.,Tanabe, S.,Uzuka, Y.,Takahashi, J.,Sarashina, T. Asian Australasian Association of Animal Productio 2001 Animal Bioscience Vol.14 No.1
In order to investigate the relationship between the incidence of displaced abomasum and feeding, the actual feeding practices and chemical compositions of roughage were examined in 2 kinds of farms at Tokachi district in Hokkaido. Examination of animal health records revealed that the annual milk yield per cow in high incidence (H-DA) farms was significantly higher than that in low incidence (L-DA) farms. The amount of concentrates fed in H-DA farms tended to be higher than that in L-DA farms during lactation. Compared to L-DA farms, the amount of juicy roughage (corn silage and grass silage) and dry roughage (hay, hay cube and roll wrap silage) during lactation in H-DA farms tended to be higher and lower, respectively. Moreover, the amount of roughage and the ratio of roughage to concentrates in H-DA farms tended to be lower than in L-DA farms. The survey indicated that displaced abomasum was associated with insufficient feeding of dietary fiber and overfeeding of concentrates.
NEAR-INFRARED PAH FEATURES IN GALACTIC PLANETARY NEBULAE
R. Ohsawa,O.ONAKA,I.SAKON,T.I. MORI,H.KANEDA,M.MATSUURA 한국천문학회 2017 天文學論叢 Vol.32 No.1
Polycyclic aromatic hydrocarbons (PAHs) are considered to be carriers of the unidentified infrared bands, which are ubiquitously observed in the Universe. PAHs are mainly formed around evolved carbon-rich stars and injected into interstellar space. Planetary nebulae (PNe), a late stage of low- and intermediate stellar mass evolution, are suitable objects to investigate the formation and evolution of PAHs. The shortest PAH feature is located in 3.3$\,\mu$m, which is important to examine the excitation and size distribution of PAHs. While the number of samples had been limited before, the high sensitivity of \textit{AKARI}/IRC has drastically increased the number of samples. We obtained the 2--5$\,\mu$m spectra of Galactic PNe with \textit{AKARI}/IRC and compiled a near-infrared spectral catalog, containing 73 PNe. We investigate the detection rate and the evolution of the PAH features. The characteristics of the catalog are illustrated and the origin of the evolution of the PAH features is discussed.
INVESTIGATION OF PAHs IN GALACTIC PLANETARY NEBULAE WITH THE AKARI/IRC AND THE SPITZER/IRS
Ohsawa, R.,Onaka, T.,Sakon, I.,Mori, T.I.,Yamamura, I.,Matsuura, M.,Kaneda, H.,Bernard-Salas, J.,Berne, O.,Joblin, C. The Korean Astronomical Society 2012 天文學論叢 Vol.27 No.4
Polycyclic aromatic hydrocarbons (PAHs) in Galactic planetary nebulae (PNe) are investigated by means of the unidentified infrared (UIR) bands. Continuous near- to mid-infrared spectra of PNe are obtained with the AKARI/IRC and the Spitzer/IRS. All 19 PNe in the present study show prominent dust emissions and we investigate the variation in the intensity ratios among the UIR bands. The ionization fraction and the size distribution of PAHs in PNe are derived using the UIR band ratios. We find that the ionization fraction of PAHs in PNe is around 0.0-0.6 and that small PAHs are scarce. The present result indicates a systematic trend of the $3.4{\mu}m$ aliphatic feature to become weak as the PAH ionization fraction increases.