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Graphene/M<sub>x</sub>WO<sub>3</sub> (M=Na, K) nanohybrids with excellent electrical properties
Liu, B.,Yin, S.,Wu, X.,Wang, Y.,Huang, Y.,Wu, J.,Sekino, T.,Matsushita, J.,Lee, S.W.,Kobayashi, M.,Kakihana, M.,Sato, T. Pergamon Press ; Elsevier Science Ltd 2015 Carbon Vol.94 No.-
Graphene/M<SUB>x</SUB>WO<SUB>3</SUB> (M=Na, K) nanocomposites with different weight ratios were successfully synthesized using MBH<SUB>4</SUB> as a reducing agent in aqueous solution, followed by crystallization of amorphous precursors under calcination in H<SUB>2</SUB> (5vol.%)/N<SUB>2</SUB> atmosphere at 600<SUP>o</SUP>C. The coupled samples showed good shielding properties in NIR wavelength range together with certain visible lights transparency. The as-prepared tungsten bronze nanoparticles are homogeneously anchored on graphene sheets, and the graphene/tungsten bronze nanocomposite showed an enhanced electrical conductivity with good shielding properties in the NIR range together with certain visible lights transparency. With the increment of graphene amount in the composites, the contact between the graphene sheets was enhanced, and the M<SUB>x</SUB>WO<SUB>3</SUB> might enhance the charge transport properties of graphene by generating the short conductive path for electrons over the remained oxygenated functional groups. The synergistic effects could be observed in the composites. When 5wt.% or more graphene were composed into M<SUB>x</SUB>WO<SUB>3</SUB>, the hybrid composite showed the higher electrical conductivity than those of uncoupled graphene and tungsten bronze alone.
Frustrated minority spins in GeNi<sub>2</sub>O<sub>4</sub>
Matsuda, M.,Chung, J.-H.,Park, S.,Sato, T. J.,Matsuno, K.,Aruga Katori, H.,Takagi, H.,Kakurai, K.,Kamazawa, K.,Tsunoda, Y.,Kagomiya, I.,Henley, C. L.,Lee, S.-H. Editions de Physique 2008 Europhysics letters Vol.82 No.3
<P>Recently, two consecutive phase transitions were observed, upon cooling, in an antiferromagnetic spinel GeNi<SUB>2</SUB>O<SUB>4</SUB> at <I>T</I><SUB><I>N</I>1</SUB>=12.1 K and <I>T</I><SUB><I>N</I>2</SUB>=11.4 K, respectively (Crawford M. K. <I>et al</I>., <I>Phys. Rev. B</I>, <B>68</B> (2003) 220408(R)). Using unpolarized and polarized elastic neutron scattering we show that the two transitions are due to the existence of frustrated minority spins in this compound. Upon cooling, at <I>T</I><SUB><I>N</I>1</SUB> the spins on the 〈111〉 kagome planes order ferromagnetically in the plane and antiferromagnetically between the planes (phase I), leaving the spins on the 〈111〉 triangular planes that separate the kagome planes frustrated and disordered. At the lower <I>T</I><SUB><I>N</I>2</SUB>, the triangular spins also order in the 〈111〉 plane (phase II). We also present a scenario involving exchange interactions that qualitatively explains the origin of the two purely magnetic phase transitions.</P>
Masatoshi Sato,Yoshiaki Kobayashi,Takayuki Kawamata,Yukio Yasui,Kazunori Suzuki,M. Itoh,Ryoichi Kajimoto,Kazuhiko Ikeuchi,M. Arai,Phillipe Bourges 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.12
To identify the superconducting symmetry of Fe-based superconductors, we studied effects ofnonmagnetic-impurities on Tc, magnetic excitation spectra 00 and NMR 1/T1 − T curve, whichare sensitive to the relative signs between the order parameters on the disconnected Fermi surfacesin reciprocal space, because the symmetry is closely connected with the pairing mechanism:If the signs are opposite (symmetry S±), the mechanism is considered to be a magneticone, but when the signs are the same (symmetry S++), a novel mechanism is plausible becausethe ordinary phonon mechanism cannot realize the Tc value as high as 55 K found in Ln1111(Ln=lanthanide). Results are as follows: (a) The very small rates of Tc-suppression by impurityatoms M of LnFe1−yMyAs0.89−xF0.11+x (M=Ni, Co, Ru) can be explained only by S++. (b) The00-data for Ba(Fe, Co)2As2 (Tc 23 K) and Ca-Fe-Pt-As crystals seem to be well explained byS++ rather than by S±. (c) The nuclear magnetic resonance data can be consistently understoodby S++, too. These results suggest the S++ symmetry and a novel pairing mechanism, which canbe considered to be related to the elastic softening of C66 induced by the orbital fluctuation of thesystem.
Al-Mamun, M.,Ito, C.,Fujita, T.,Sano, H.,Sato, A. Asian Australasian Association of Animal Productio 2007 Animal Bioscience Vol.20 No.10
The [$^2H_5$]phenylalanine model was compared with the [1-$^{13}C$]leucine method to determine whole body protein synthesis (WBPS) and degradation (WBPD) in sheep fed at two levels. The animals were fed either 103 (M-diet) or 151 (H-diet) kcal $ME/kg^{0.75}/day$ once daily in a crossover design for 21 days each. The isotope dilutions were simultaneously conducted as a primed-continuous infusion of [$^2H_5$]phenylalanine, [$^2H_2$]tyrosine and [1-$^{13}C$]leucine on each dietary treatment. The WBPS and WBPD calculated from the [$^2H_5$]phenylalanine model were lower (p = 0.009 and p = 0.003, respectively) than those calculated from the [1-$^{13}C$]leucine method. The WBPS tended to be higher (p = 0.08) and WBPD was numerically higher (p = 0.33) for H-diet than M-diet in the [$^2H_5$]phenylalanine model, whereas the WBPS was numerically higher (p = 0.37) for H-diet and WBPS remained similar (p = 0.79) between diets in the [1-$^{13}C$]leucine method. However, the absolute values and the directions of WBPS as well as WBPD from M-diet to H-diet were comparable between the [$^2H_5$]phenylalanine model and [1-$^{13}C$]leucine method. Moreover, the values vary depending on the use of the respective amino acid contents in the carcass protein when calculating WBPS and WBPD. Therefore, it is concluded that the [$^2H_5$]phenylalanine model could be used as an alternative to the [1-$^{13}C$]leucine method for the determination of WBPS and WBPD in sheep.
C. J. Yoon,H. Akikawa,K. Aoki,Y. Fukao,H. Funahashi,M. Hayata,K. Imai,K. Miwa,H. Okada,N. Saito,H. D. Sato,K. Shoji,H. Takahashi,K. Taketani,J. Asai,M. Kurosawa,M. Ieiri,T. Hayakawa,T. Kishimoto,A. Sa 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.23
We determined scattering length and effective range of ΛΛ scattering for the ΛΛ relative energy (M_(ΛΛ)-2M_Λ) from ΛΛ threshold to 30 MeV/c_2. Phase shift of the ΛΛ wave function which described by scattering length and effective range was determined by fitting the ΛΛ mass spectrum. The obtained scattering length -0.10^(+0.37)_(-1.56) ± 0.04, and effective range 13.90 ^(+14.35)_(-9.13) ± 10.53 fm is the most consistent with the values predicted by using a series of the Nijmegen soft core models NSC97's. However the predicted values by using the Nijmegen hard core model ND (G-matrix), the extended soft core model ESC00, and the Kyoto-Niigata FSS are out of three standard deviations from the determined scattering parameters. Further, we determine ΛΛ potential by fitting the ΛΛ invariant mass spectrum using numerically solved ΛΛ wave function with two-Gaussian shaped potential well. The ΛΛ scattering parameters derived from the wave function are found to be scattering length -0.09, and effective range 29.34 fm with a maximum phase shift of 2.4 deg.
Detection of planet candidates around K giants. HD 40956, HD 111591, and HD 113996
Jeong, G.,Lee, B.-C.,Han, I.,Omiya, M.,Izumiura, H.,Sato, B.,Harakawa, H.,Kambe, E.,Mkrtichian, D. Springer-Verlag 2018 Astronomy and astrophysics Vol.610 No.-
<P><I>Aims. </I>The purpose of this paper is to detect and investigate the nature of long-term radial velocity (RV) variations of K-type giants and to confirm planetary companions around the stars. </P><P><I>Methods. </I>We have conducted two planet search programs by precise RV measurement using the 1.8 m telescope at Bohyunsan Optical Astronomy Observatory (BOAO) and the 1.88 m telescope at Okayama Astrophysical Observatory (OAO). The BOAO program searches for planets around 55 early K giants. The OAO program is looking for 190 G-K type giants. </P><P><I>Results. </I>In this paper, we report the detection of long-period RV variations of three K giant stars, HD 40956, HD 111591, and HD 113996. We investigated the cause of the observed RV variations and conclude the substellar companions are most likely the cause of the RV variations. The orbital analyses yield <I>P</I> = 578.6 ± 3.3 d, <I>m</I> sin <I>i</I> = 2.7 ± 0.6 <I>M</I>J, <I>a</I> = 1.4 ± 0.1 AU for HD 40956; <I>P</I> = 1056.4 ± 14.3 d, <I>m</I> sin <I>i</I> = 4.4 ± 0.4 <I>M</I>J, <I>a</I> = 2.5 ± 0.1 AU for HD 111591; <I>P</I> = 610.2 ± 3.8 d, <I>m</I> sin <I>i</I> = 6.3 ± 1.0 <I>M</I>J, <I>a</I> = 1.6 ± 0.1 AU for HD 113996. </P>
Sato, Y.,Iijima, T.,Adamczyk, K.,Aihara, H.,Asner, D. M.,Atmacan, H.,Aushev, T.,Ayad, R.,Aziz, T.,Babu, V.,Badhrees, I.,Bakich, A. M.,Bansal, V.,Behera, P.,Bhardwaj, V.,Bhuyan, B.,Biswal, J.,Bonvicini American Physical Society 2016 Physical review. D Vol.94 No.7
<P>We report a measurement of the ratio R(D*) = B((B) over bar (0) -> D*(+)tau(-)(nu) over bar (tau))/B((B) over bar (0) -> D*(+)l(-)(nu) over bar (l))where l denotes an electron or a muon. The results are based on a data sample containing 772 x 10(6) B (B) over bar pairs recorded at the Upsilon(4S) resonance with the Belle detector at the KEKB e(+)e(-) collider. We select a sample of B-0(B) over bar (0) pairs by reconstructing both B mesons in semileptonic decays to D*(-/+)l(+/-). We measure R(D*) = 0.302 +/- 0.030(stat) +/- 0.011(syst), which is within 1.6 sigma of the Standard Model theoretical expectation, where the standard deviation sigma includes systematic uncertainties. We use this measurement to constrain several scenarios of new physics in a model-independent approach.</P>
Observation of the decayB0→η′K*(892)0
Sato, S.,Yusa, Y.,Mohanty, G. B.,Abdesselam, A.,Adachi, I.,Aihara, H.,Al Said, S.,Asner, D. M.,Aushev, T.,Ayad, R.,Bahinipati, S.,Bakich, A. M.,Bansal, V.,Bhardwaj, V.,Bhuyan, B.,Bonvicini, G.,Bozek, American Physical Society 2014 PHYSICAL REVIEW D - Vol.90 No.7
SEARCH FOR STRANGE TRIBARYON STATES IN THE 4He(STOPPED K-, p) REACTION
SATO, M.,BHANG, H.,CHIBA, J.,CHOI, SEONHO,FUKUDA, Y.,HANAKI, T.,HAYANO, R. S.,IIO, M.,ISHIKAWA, T.,ISHIMOTO, S.,ISHIWATARI, T.,ITAHASHI, K.,IWAI, M.,IWASAKI, M.,KIENLE, P.,KIM, J. H.,MATSUDA, Y.,OHNIS World Scientific 2009 International Journal of Modern Physics A Vol.24 No.2
<P> We have measured a proton energy from the stopped K<SUP>-</SUP> reaction on <SUP>4</SUP> He to search for strange tribaryon states at KEK 12 GeV PS. No statistically significant signal was observed in the missing mass spectrum obtained by the inclusive <SUP>4</SUP> He ( stopped K<SUP>-</SUP>, p) measurement. Upper limits of the formation branching ratio at the 95 % C.L. were derived for neutral tribaryon states with strangeness -1 to be (0.4 ~ 6) × 10<SUP>-4</SUP>, (0.2 ~ 6) × 10<SUP>-3</SUP> and (0.06 ~ 5) × 10<SUP>-2</SUP>/(stopped K<SUP>-</SUP>) for assumed natural widths of 0, 20 and 40 MeV /c<SUP>2</SUP>, respectively. </P>
Static displacement and elastic buckling characteristics of structural pipe-in-pipe cross-sections
Sato, M.,Patel, M.H.,Trarieux, F. Techno-Press 2008 Structural Engineering and Mechanics, An Int'l Jou Vol.30 No.3
Structural pipe-in-pipe cross-sections have significant potential for application in offshore oil and gas production systems because of their property that combines insulation performance with structural strength in an integrated way. Such cross-sections comprise inner and outer thin walled pipes with the annulus between them fully filled by a selectable thick filler material to impart an appropriate combination of properties. Structural pipe-in-pipe cross-sections can exhibit several different collapse mechanisms and the basis of the preferential occurrence of one over others is of interest. This paper presents an elastic analyses of a structural pipe-in-pipe cross-section when subjected to external hydrostatic pressure. It formulates and solves the static and elastic buckling problem using the variational principle of minimum potential energy. The paper also investigates a simplified formulation of the problem where the outer pipe and its contact with the filler material is considered as a 'pipe on an elastic foundation'. Results are presented to show the variation of elastic buckling pressure with the relative elastic modulus of the filler and pipe materials, the filler thickness and the thicknesses of the inner and outer pipes. The range of applicability of the simplified 'pipe on an elastic foundation' analysis is also presented. A brief review of the types of materials that could be used as the filler is combined with the results of the analysis to draw conclusions about elastic buckling behaviour of structural pipe-in-pipe cross-sections.