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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.
Lee, Sang-Mog,Lee, Won-Chang,Sakai, Takeo,Hamakawa, Masaaki,Yoon, Chong-sam,Masuda, Testuya 건국대학교 동물자원연구센터 1991 動物資源硏究誌 Vol.16 No.-
Actinobacillus Pleuropneumonia(AP)에 感染된 豚에게 doxycycline hydrochloride(DOXY)와 thiamphenicol(TP)를 각각 100ppm에서 200ppm씩 食餌에 첨가하여 7일간 投與한 결과에서는 기침(咳)과 鼻漏의 치료효과가 관찰되었으며, 17일 후에서는 體重의 증가와 辭料攝取率이 向上되었고, 部檢上 肺藏에 病變이 없었으며, 겸하여 DOXY의 100ppm과 200ppm 投與群에서는 肺臟에서 Actinobacillus Pleuropneumonia와 KPasteurella multocida가 분리되지 않았다. In order to an experimental find out on the antimicrobial efficacy of doxycycline hydrochloride(DOXY) and thiamphenicol(TP) were given to pigs infected with Actinnobacillus pleuropneumonia(AP) for 7 days. Clinical therapeutic efficacy on coughing and rhinorrhea was observed with 100ppm to 200ppm in the diet. Weight gain and food consumption were improved and pulmonary lesions were not observed at necropsy in the 100 ppm or 200 ppm groups on day 17. In addition, neither Ap nor Pasteurella multocida(Pm) was isolated from the lungs of pigs in the 100 ppm or 200 ppm DOXY on day 17. Key word: antimicrobial efficacy of DOXY and TP.
Kluyveromyces marxianus var. marxianus IFO 1735에 의한 Inulin Fructotransferase의 생산 및 이용에 관한 연구
김재근,坂井石夫 한국산업미생물학회 1997 한국미생물·생명공학회지 Vol.25 No.3
Iunlin을 di-D-fructofuranose 1,2' : 2,3' dianhydride (DFAⅢ)로 전환시키는 inulin fructotransferase (inulaseⅡ)를 생산하는 균주로 Kluyveromyces marxianus var. marxianus를 선별하였다. 공시균의 inulaseⅡ의 생성을 위한 최적 배지조성은 1.0%의 sucrose 및 0.75%의 YNB이었으며 최적 배양조건은 초기 pH, 배양온도 및 배지량은 각각 4.7, 30℃ 및 140 ㎖이었다. 상기 최적 조건으로 36시간 배양하였을 때 효소 생산량이 가장 높아 배양액 ㎖당 약 4.2 unit를 나타내었다. 본 효소의 이용성을 검토한 결과 돼지감자 추출액을 이용한 천연배지의 경우 상기 최적 배양조건에서 48시간 배양으로 DFAⅢ 생산량이 가장 높아 배양액 ㎖당 13.25 ㎎을 나타내었다. Kluyveromyces marxianus var. marxianus isolated as an inulin-assimilating microorganism produces inulin fructotransferase (inulaseⅡ) which catalyses the conversion of inulin into di-D-fructofuranose 1, 2' : 2, 3' dianhydrde (DFAⅢ). The DFA produced by the organism was isolated by using active carbon column, and identified as DFAⅢ by high performance liguid chromatography. The culture medium giving maximum inulaseⅡ producton was found to consist of 1% sucrose and 0.75% yeast nitrogen base (YNB). The inulaseⅡ production was induced by inulin or sucrose as a carbon source and increased by addition of YNB as a nitrogen source. Optimal initial pH of the culture medium, culture temperature and medium volume for the enzyme production were pH 4.7, 30℃ and 140 ㎖, respectively. Under the optimal conditions described above, the enzyme activity in the culture supernatant reached 4.2 units/㎖ after cultivation for 36 h. The DGAⅢ was accumulated at 13.25 ㎎/㎖ after 48 h of culture in the Jerusalem artichoke tuber medium.
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.,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.