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Quantum Phase Transitions in 1/3 Plateau of the Quantum Spin Tube
Kouichi Okunishi,Masahiro Sato,Tˆoru Sakai,Kiyomi Okamoto,Chigaku Itoi,이진형 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.3
We study quantum phase transitions in the 1/3 plateau state of the three-leg spin-1/2 tube,where the low-energy effective chirality degree of freedom plays an essential role. Using the densitymatrix renormalization group and the effective chirality model, we find that, as the leg couplingincreases, the chirality liquid, a novel spin imbalance phase and the vector-spin-chirality orderedphase emerge without closing the plateau spin gap. We also clarify the role of the S3-symmetry ofthe spin tube, behind these quantum phase transitions.
T. Ogawa,M. Nakayama,M. Haraguchi,M. Kuwahara,M. Fukui,S. Matsuo,T. Okamoto 한국물리학회 2005 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.47 No.1
We have macroscopically and microscopically investigated the localized surface plasmons (LSPs)on Ag anoparticles embedded in porous TiO2 glass. We have prepared TiO2 glass containing Ag nanoparticles (Ag/TiO2) by the sol-gel process and changed the porosity of the TiO2 glass by drying under a high vacuum condition. Using a spectrometer, we have macroscopically measured the absorption spectra (ABS) on all Ag nanoparticles and using near-field scanning optical microscopy (NSOM), we have microscopically measured the scattering spectra on a single Ag nanoparticle in the Ag/TiO2 after each drying process. Fitting the spectra derived from the numerical calculation based on the Mie theory to that evaluated from the ABS and the NSOM measurements, we have evaluated the deviation of the full width at half maximum evaluated by the experimental measurements from that derived from the theoretical calculation (FWHM) and the bound (Hashin-Shtrikman bounds) of the porosity of the TiO2 glass by the use of the Hashin Shtrikman limit, similar to the literature [1]. It has been found that the FWHM of the scattering spectra on the single Ag nanoparticle can be much smaller than one of the ABS on all Ag nanoparticles in the Ag/TiO2. This result is due to that the ABS is influenced by the aggregation and the size distribution of all Ag nanoparticles. Furthermore, on extrapolating from the plot of FWHM vs porosity, the FWHM is reduced to zero when the porosity is about 15 %.
Tuning of magnetic and transport properties in Bi2Te3by divalent Fe doping
Jo, N. H.,Lee, K. J.,Kim, C. M.,Okamoto, K.,Kimura, A.,Miyamoto, K.,Okuda, T.,Kim, Y. K.,Lee, Z.,Onimaru, T.,Takabatake, T.,Jung, M. H. American Physical Society 2013 Physical review. B, Condensed matter and materials Vol.87 No.20
Blood Protein Polymorphisms of Native Fowls in Laos
Okamoto, S.,Tsunekawa, N.,Kawamoto, Y.,Worawut, R.,Kawabe, K.,Maeda, Y.,Nishida, T. Asian Australasian Association of Animal Productio 1999 Animal Bioscience Vol.12 No.7
Blood protein polymorphism of fowls in Laos was analyzed by electrophoresis. Blood samples were collected in the area of Viangchan, Louangphrabang and Pakxe. Out of 17 loci, polymorphism was detected at the following seven loci; ES-1, Amy-1, Akp-akp, Akp-2, Alb, Tf and Pas. The other ten loci; Amy-3, LDH, 6-PGD, PGM, PHI, To, MDH, Es-D, Hb-l, Hb-2 were noted to be monomorphic. The proportion of polymorphic loci $(P_{poly})$, the expected average heterozygosity per individual ($\bar{H}$), and the subdivision index $(G_{ST})$ of the native fowl in Laos was $0.412{\pm}0.123$, 0.106 and 0.026, respectively. Genetic distance between native fowls in Laos, Bangladesh, and Nepal was clustered in one group.
EFFECTS OF DIETARY PROTEINS ON THE ACTIVITIES OF LIPOGENIC ENZYMES IN THE LIVER OF GROWING CHICKS
Tanaka, K.,Okamoto, T.,Ohtani, S. Asian Australasian Association of Animal Productio 1992 Animal Bioscience Vol.5 No.1
In Experiment 1, when fasted chicks were fed diets containing various sources of protein for 3 days, the activities of lipogenic enzymes (acetyl-CoA carboxylase, fatty acid synthetase, citrate cleavage enzyme and malic enzyme) in the liver of growing chicks were significantly lower in the soybean protein or gluten diet than in the casein or fish protein diet. Triglycride contents of the liver and plasma of chicks fed the casein or fish protein diet were significantly lower than that of those fed soybean protein or gluten diet. In Experiment 2, the effects of dietary amino acid mixture simulating casein or protein on the activities of hepatic lipogenic enzymes were examined. The activities of acetyl-CoA carboxylase and fatty acid synthetase in the liver of chicks fed the casein diet were significantly higher than that of those fed the soybean protein diet or two diets of amino acid mixtures. Furthermore, there were no significant differences between the two diets of amino acid mixture based on casein or soybean protein. However, the activities of malic enzyme and citrate cleavage enzyme tended to be lower in the soybean-type amino acid diet than in the casein-type amino acid diet. Thus, some effects can be ascribed to the protein itself and some to the amino acid composition of the protein sources.
Photonic Crystal Nanocavities for E cient Light Con nement and Emission
Axel Scherer,,T. Yoshie,,M. Lon car,,J. Vu ckovi c,K. Okamoto,D. Deppe 한국물리학회 2003 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.42 No.III
When combined with high index contrast slabs in which light can be efficiently guided, microfabricated two-dimensional photonic crystals provide us with the geometries needed to confine and concentrate light into extremely small volumes and to obtain very high field intensities. Fabrication of optical structures has now evolved to a precision which allows us to control light within such etched nanostructures. Sub-wavelength nano-optic cavities can be designed for efficient and flexible control over both emission wavelength and frequency, and nanofabricated optical waveguides can be used for efficient coupling of light between devices. The substantial reduction of the size of optical components leads to their integration in large numbers and the possibility to combine different functionalities on a single chip, much in the same way as electronic components have been integrated for improved multi-functionality of microchips. Here we describe the use of microfabricated periodic structures, photonic crystals, to define functional nano-optic cavities for efficient confinement and emission of light, which leads to the desire for miniaturization of optical devices.
Asian, Aniwaru,Okamoto, M.,Yoshihira, T.,Ataku, K.,Narasaki, N. Asian Australasian Association of Animal Productio 1997 Animal Bioscience Vol.10 No.6
The changes of tissue structure in timothy and alfalfa during ensiling process with silage additives; lactic acid bacteria, cellulase and formic acid, were observed with a video microscope. Stem samples were obtained from the second internode, and cut to divide into 2 pieces. One piece was for observation of ensiled material and the other was for silage. The latter piece was put into a nylon cloth bag, and ensiled with grass for 50 days in a small experimental silo Lignification of the plant tissues was checked by acid phloroglucinol. Natural silage fermentation resulted in some degradation of less lignified parenchyma in both plant species. However, lignified sclerenchyma and vascular bundles remained intact. The cellulase enhanced the degradation of parenchyma tissue, while the formic acid suppressed the degradation. The effect of lactobacillus was small. The percentage of remained cross sectional area of stem and the loss of NDF and ADF by silage fermentation confirmed the observation. High negative correlations were obtained between the remained area and loss of fibrous components during silage fermentation in both plants, and between the loss of fibrous components and in vitro dry matter digestibility in timothy but not in alfalfa.