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Watanabe, H.,Zhang, G.X.,Yoshida, K.,Walker, P.M.,Liu, J.J.,Wu, J.,Regan, P.H.,Soderstrom, P.A.,Kanaoka, H.,Korkulu, Z.,Lee, P.S.,Nishimura, S.,Yagi, A.,Ahn, D.S.,Alharbi, T.,Baba, H.,Browne, F.,Bruce North-Holland Pub. Co 2016 Physics letters. Section B Vol.760 No.-
The level structure of <SUP>172</SUP>Dy has been investigated for the first time by means of decay spectroscopy following in-flight fission of a <SUP>238</SUP>U beam. A long-lived isomeric state with T<SUB>½</SUB>=0.71(5) s and K<SUP>π</SUP>=8<SUP>-</SUP> has been identified at 1278 keV, which decays to the ground-state and γ-vibrational bands through hindered electromagnetic transitions, as well as to the daughter nucleus <SUP>172</SUP>Ho via allowed β decays. The robust nature of the K<SUP>π</SUP>=8<SUP>-</SUP> isomer and the ground-state rotational band reveals an axially-symmetric structure for this nucleus. Meanwhile, the γ-vibrational levels have been identified at unusually low excitation energy compared to the neighboring well-deformed nuclei, indicating the significance of the microscopic effect on the non-axial collectivity in this doubly mid-shell region. The underlying mechanism of enhanced γ vibration is discussed in comparison with the deformed Quasiparticle Random-Phase Approximation based on a Skyrme energy-density functional.
Conductive SiC ceramics fabricated by spark plasma sintering
Kim, K.J.,Jang, S.H.,Kim, Y.W.,Jang, B.K.,Nishimura, T. Elsevier 2016 CERAMICS INTERNATIONAL Vol.42 No.15
Bulk SiC ceramics were fabricated by spark plasma sintering, and the effects of Y<SUB>2</SUB>O<SUB>3</SUB> addition on the structural and electrical properties were investigated. Raman spectroscopy revealed that SiC specimens with low Y<SUB>2</SUB>O<SUB>3</SUB> content (0.01 and 0.05wt%) contained a graphitic phase (1580 and 2710cm<SUP>-1</SUP>) which was insignificant for high Y<SUB>2</SUB>O<SUB>3</SUB> content (1.0 and 5.0wt%). Carbon-rich SiC specimens exhibited p-type conduction character, while others exhibited n-type character. The p- and n-type SiC specimens had electrical resistivities around 10<SUP>-2</SUP>Ωcm but exhibited photoluminescence spectra quite different from each other. The p-type character is primarily attributable to silicon vacancies (V<SUB>Si</SUB>), while the n-type character is ascribed to nitrogen substitution in carbon sites (N<SUB>C</SUB>) of the zincblende lattice. The change in conduction type with yttria addition in the SiC specimen can be understood in terms of a competition between the densities of V<SUB>Si</SUB> and N<SUB>C</SUB>.
Studies on electron Bernstein wave heating in CHS and LHD at NIFS
Y. Yoshimura,H. Igami,S. Ferrando-Margalet,K. Nagasaki,S. Kubo,T. Shimozuma,M. Isobe,C. Suzuki,A. Shimizu,T. Akiyama,C. Takahashi,K. Nagaoka,S. Nishimura,T. Minami,K. Matsuoka,S. Okamura,T. Mutoh 한국진공학회 2007 한국진공학회 학술발표회초록집 Vol.16 No.2
Characteristics of second harmonic ECCD on CHS
yasuo Yoshimura,H. Matsushita,H. Igami,K. Nagasaki,K. Matsuoka,K. Ohkubo,K. Nagaoka,M. Isobe,S. Kobayashi,S. Okamura,S. Kubo,S. Nishimura,T. Minami,T. Akiyama,T. Notake,T. Shimozuma,A. Shimizu,C. Suzu 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.49 No.III
Second harmonic electron cyclotron current drive (ECCD) has been investigated on CHS (Compact Helical System) by using a 2-D steerable EC-beam injection system. The direction of the plasma current, which is the sum of bootstrap current and EC-driven current, is clearly reversed by a reversal of the EC-beam injection direction. The direction of driven current is consistent with expectation in the case of low-field side injection of EC wave. So far, a driven current up to 6 kA has been obtained when bootstrap current is less than 2 kA. It is confirmed that right-hand polarization and low density are effective for ECCD.
BGN Mutations in X-Linked Spondyloepimetaphyseal Dysplasia
Cho, S.Y.,Bae, J.S.,Kim, N.K.D.,Forzano, F.,Girisha, K.M.,Baldo, C.,Faravelli, F.,Cho, T.J.,Kim, D.,Lee, K.Y.,Ikegawa, S.,Shim, J.S.,Ko, A.R.,Miyake, N.,Nishimura, G.,Superti-Furga, A.,Spranger, J.,Ki University of Chicago Press [etc.] 2016 American journal of human genetics Vol.98 No.6
<P>Spondyloepimetaphyseal dysplasias (SEMDs) comprise a heterogeneous group of autosomal-dominant and autosomal-recessive disorders. An apparent X-linked recessive (XLR) form of SEMD in a single Italian family was previously reported. We have been able to restudy this family together with a second family from Korea by segregating a severe SEMD in an X-linked pattern. Exome sequencing showed missense mutations in BGN c.439A>G (p.Lys147Glu) in the Korean family and c.776G>T (p.Gly259Val) in the Italian family; the c.439A>G (p.Lys147Glu) mutation was also identified in a further simplex SEMD case from India. Biglycan is an extracellular matrix proteoglycan that can bind transforming growth factor beta (TGF-beta) and thus regulate its free concentration. In 3-dimensional simulation, both altered residues localized to the concave arc of leucine-rich repeat domains of biglycan that interact with TGF-beta. The observation of recurrent BGN mutations in XLR SEMD individuals from different ethnic backgrounds allows us to define 'XLR SEMD, BGN type'' as a nosologic entity.</P>
Tribological Properties of Co-Sputtered MOS₂ Films
K. SAGARA,T. YAMAZAKI,M. NISHIMURA 한국트라이볼로지학회 2002 한국트라이볼로지학회 학술대회 Vol.2002 No.10
Tribological properties of co-sputtered Molybdenum disulfide (MoS₂)/Carbon (C) films were studied and compared with those of sputtered MoS₂ films. Friction tests were carried out using pin-on-disk friction testers to evaluate their friction and wear behaviors in a vacuum (10?? ㎩), air and humid air of 30, 50, 80% RH. MoS₂/C (14%) composite films exhibited about 9 times longer wear life in a vacuum and about 6 times longer wear life in dry air than MoS₂ films did. They also showed stable low friction coefficient of about 0.02 in a vacuum. In humid air, however, MoS₂/C composite films hardly showed good tribological properties.
Nishimura, F .,Morino, K .,Nisitani, H . 대한금속재료학회(대한금속학회) 2000 METALS AND MATERIALS International Vol.6 No.6
In this paper, in order to clarify the effect of crack coalescence for crack growth rate, low cycle fatigue tests were carried out using two kinds of spheroidal graphite cast iron (SGI). Crack propagation behavior from crack initiation to fracture was investigated by observing the surface of specimens and their fracture section. 'The main results obtained are as follows: (1) The variation range in the crack growth curves in SGI is larger than that in its matrix material. This tendency is caused by the occurrence of crack coalescence and the difference in crack initiation length. (2) In most of the cases where the crack growth rate accelerated, there was microshrinkage on the neighboring surface. (3) Crack coalescence is not the main factor in accelerating crack growth rate.