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Novel Field-induced Quantum Phase Transition of the Kagome-lattice Antiferromagnet
Tˆoru Sakai,Hiroki Nakano 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.3
The magnetization process of the S = 1/2 kagome-lattice quantum antiferromagnet is investigatedusing the numerical exact diagonalization up to 36-site clusters. Our previous finite-size scalinganalysis with rhombic clusters indicated the “magnetization ramp” as a novel field-induced quantumphase transition at 1/3 the saturation magnetization. As another possible exotic behavior, we focuson the feature of the magnetization curve at 2/3 the saturation. The critical exponent analysisindicates that a different singular behavior occurs at the 2/3 magnetization.
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.
Progress in R&D of coated conductor in M-PACC project
Izumi, T.,Ibi, A.,Nakaoka, K.,Taneda, T.,Yoshida, T.,Takagi, Y.,Nakamura, T.,Machi, T.,Katayama, K.,Sakai, N.,Yoshizumi, M.,Koizumi, T.,Kimura, K.,Kato, T.,Kiss, T.,Shiohara, Y. The Korea Institute of Applied Superconductivity a 2014 한국초전도저온공학회논문지 Vol.16 No.2
The five-year national project in Japan for R&D of coated conductors and applications, named as the Materials and Power Applications of Coated Conductors (M-PACC) project, was finished at the end of FY2013. The project consists of four sub-themes as cable, transformer, SMES and coated conductors. In the theme of coated conductors, the fabrication process had been developed to satisfy the requirements from the applications such as in-field $I_c$ performance, low AC loss in the long tapes etc. Through the project, the remarkable progress was achieved as follows; a high in-field minimum $I_c$ value over 54A/cm-width under 3T at 77K was realized in a 200m long EuBCO tape with artificial pinning centers of $BaHfO_3$ by the pulsed laser deposition (PLD) technique on the IBAD template. On the other hand, the AC loss reduction was confirmed in the tapes fabricated by both PLD and the metal organic deposition (MOD) techniques by scribing 100m tapes into 10-filamments. Additionally, the mechanism of the delamination phenomenon was systematically investigated and the strength was improved by eliminating the origins of the weak points in the films. Through the development, all targeted goals were accomplished and the several results were appreciated as a world champion data.
High Pressure Synthesis of Mg0.90Al0.08Ni0.94V0.08H1.6
Sakai, T .,Chen, J .,Kitamura, N .,Takeshita, H . T .,Kuriyama, N . 대한금속재료학회(대한금속학회) 2000 METALS AND MATERIALS International Vol.6 No.6
The effect of high-pressure (6 gigapascal) and heating (600℃) the hydrogen source of LiAlH₄ on the structural and hydrogenation properties of 0.9MgH₂+0.1Al+0.9Ni+0.1VH_(0.9) was investigated. After recovery to ambient conditions, the sample was analyzed using X-ray diffractioin, differential scanning calorimetry, thermogravimetry and differential thermal analyses. The results reveal that a nominal hydride phase with the composition of Mg_(0.90)Al_(0.08)Ni_(0.94)V_(0.08)H_(1.6) can be obtained, in which a maximum H₂-uptake can reach 1.9 wt.%, with hydride decomposition occurring between 160℃ and 250℃.
T. Oka,M. Furusawa,K. Sudo,L. Dadiel,N. Sakai,H. Seki,M. Miryala,M. Murakami,T. Nakano,M. Ooizumi,K. Yokoyama,M. Tsujimura 한국초전도저온공학회 2021 초전도와 저온공학 Vol.23 No.3
Nickel (Ni) is a kind of the rare earth resources. Since Ni-containing waste is drained after several plating operations in the factories, the effective recycling technique has been expected to be introduced. An actual magnetic separation technique using HTS bulk magnet generating the strong magnetic field has succeeded in collecting the paramagnetic slurry containing Ni-sulphate coarse crystals which were fabricated from the Ni-plating waste. The Ni compound in the collected slurry was identified as NiSO4/6H2O, showing slight differences in the particle size and magnetic susceptibility between the samples attracted and not-attract to the magnetic pole. This preferential extraction suggests us a novel recycling method of Ni resource because the compound is capable of recycling back to the plating processes as a raw material.
Masuda, T.,Taniguchi, T.,Suzuki, K.,Sakai, T.,Morichi, T. Asian Australasian Association of Animal Productio 2001 Animal Bioscience Vol.14 No.3
The rapid formation of a cream line cannot be observed in raw goat's milk standing at a low temperature. Although the poor creaming ability of goat's milk has been considered to be due to the small size of milk fat globules and the lack of euglobulin capable of being adsorbed on milk fat globules, there is much left to study. The present work attempted to elucidate a factor for poor creaming ability of goat's milk. The creaming ability of the experimental milks reconstituted from creams and skim milks separated from cow's milk or goat's milk was measured by the volume of the cream layer and the fat content of bottom layer. The polypeptides composition of the P1 the fraction (i.e., the high molecular weight fraction eluted near the void volume obtained by the gel filtration of whey) and milk fat globule membrane prepared from both milks were compared. It was found that the promotion of creaming originated from goat's skim milk was lower than that from cow's skim milk. The P1 fraction in goat's skim milk was less than that in cow's skim milk. The polypeptide (M.W. $4.3{\times}10^4$), found in the P1 fraction of cow's milk was not found in the P1 fraction of goat's milk. It is suggested that the poor creaming ability of goat milk is caused mainly by the difference from cow milk in the amount and the composition of the P1 fraction.
Masuda, T.,Rehinarudo, H.Y.,Suzuki, K.,Sakai, T.,Morichi, T. Asian Australasian Association of Animal Productio 2000 Animal Bioscience Vol.13 No.9
Bovine colostrum, which contains a large quantity of immunoglobulins, is indispensable for newborn animals. The establishment of a new procedure for preserving colostrum without losing the immunological activity is significant. We examined the effect of high hydrostatic pressure treatment (100~500 MPa) on the preservability and the immunochemical activity of bovine colostrum. When high hydrostatic pressure treatment was 300 MPa or more, the increase of the total viable count, coliforms and psychrotrophic gram-negative bacteria was suppressed effectively. In particular, the number of coliforms in colostrum treated at 300 MPa or more hardly increased for 35 days at $4{^{\circ}C}$. At 400 MPa or more, both gelling of the colostrum and denaturation of immunoglobulins were observed. However, if the pressure was 300 MPa, immunoglobulins were scarcely influenced and the neutralizing titers against the bovine coronavirus did not decrease. Therefore, it was suggested that 300 MPa was the best pressure for good preservability of colostrum without reducing the immunochemical response.
Oka, T.,Furusawa, M.,Sudo, K.,Dadiel, L.,Sakai, N.,Seki, H.,Miryala, M.,Murakami, M.,Nakano, T.,Ooizumi, M.,Yokoyama, K.,Tsujimura, M. The Korean Society of Superconductivity and Cryoge 2021 한국초전도저온공학회논문지 Vol.23 No.3
Nickel (Ni) is a kind of the rare earth resources. Since Ni-containing waste is drained after several plating operations in the factories, the effective recycling technique has been expected to be introduced. An actual magnetic separation technique using HTS bulk magnet generating the strong magnetic field has succeeded in collecting the paramagnetic slurry containing Ni-sulphate coarse crystals which were fabricated from the Ni-plating waste. The Ni compound in the collected slurry was identified as NiSO<sub>4</sub>/6H<sub>2</sub>O, showing slight differences in the particle size and magnetic susceptibility between the samples attracted and not-attract to the magnetic pole. This preferential extraction suggests us a novel recycling method of Ni resource because the compound is capable of recycling back to the plating processes as a raw material.