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S. Ohnishi,K. Kondo,S. Sato,K. Ochiai,K. Takakura,C. Konno,I. Murata 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.23
A new collimator system was constructed to produce a new collimated DT neutron beam for new integral benchmark experiments at the first target room of the Fusion Neutronics Source facility in Japan Atomic Energy Agency. The collimator system had been designed and optimized with a neutron transport calculation code and the performance of the collimated DT neutron beam was tested with an imaging plate, activation foil and a scintillation counter. The DT neutron flux at the exit of the collimator hole was 2.22 × 10^6 cm^(-2)s^(-1), which was 239 times as large as that at the 2 cm off-centered position. It was confirmed that the new DT neutron beam had a good performance as expected.
Sung, M.,Chubachi, H.,Sato, R.,Shin, M. K.,Kwon, S. K.,Pu, Y. J.,Kim, Y. H. Royal Society of Chemistry 2017 Journal of Materials Chemistry C Vol.5 No.5
<P>New deep blue emitters containing an sp(3)-hybridised tetrahedral silicon core with dimethyl groups, 9,10-biarylanthracene, and pyrene were synthesised. The pyrene group, with planar pi-conjugation and a slightly larger energy gap than that of anthracene, is expected to work as an intramolecular host group in organic light emitting diodes (OLEDs). Density functional theory (DFT-B3LYP) and time-dependent DFT calculations for molecular orbitals and excited states of pyrene and anthracene units showed the possibility of intramolecular energy transfer and a triplet-triplet annihilation (TTA) process. The maximum external quantum efficiencies (EQEs) of non-doped devices using PA1N and PA2N were 4.7% and 4.8%, respectively, while the maximum EQEs of doped devices using PA1N and PA2N as dopants (3 wt%) were 4.5% and 3.6%, respectively. The EQE of the non-doped device with a low photoluminescence quantum yield (PLQY) (14%) was higher than that of the doped device with a high PLQY (74%), which resulted from the existence of a contribution reproducing radiative S-1 excitons from nonradiative T-1 excitons in the non-doped devices. Both non-doped and doped devices using PA1N and PA2N showed high color pure blue emission. [ Commission Internationale de l'Eclairage coordinates, CIE (x,y), of the non-doped device were (0.16,0.08) for PA1N and (0.15,0.10) for PA2N.]</P>
The role of system Xc<sup>-</sup> in methamphetamine-induced dopaminergic neurotoxicity in mice
Dang, D.K.,Shin, E.J.,Tran, H.Q.,Kim, D.J.,Jeong, J.H.,Jang, C.G.,Nah, S.Y.,Sato, H.,Nabeshima, T.,Yoneda, Y.,Kim, H.C. Pergamon Press 2017 Neurochemistry International Vol.108 No.-
The cystine/glutamate antiporter (system Xc<SUP>-</SUP>, Sxc) transports cystine into cell in exchange for glutamate. Since xCT is a specific subunit of Sxc, we employed xCT knockout mice and investigated whether this antiporter affected methamphetamine (MA)-induced dopaminergic neurotoxicity. MA treatment significantly increased striatal oxidative burdens in wild type mice. xCT inhibitor [i.e., S-4-carboxy-phenylglycine (CPG), sulfasalazine] or an xCT knockout significantly protected against these oxidative burdens. MA-induced increases in Iba-1 expression and Iba-1-labeled microglial immunoreactivity (Iba-1-IR) were significantly attenuated by CPG or sulfasalazine administration or xCT knockout. CPG or sulfasalazine significantly attenuated MA-induced TUNEL-positive cell populations in the striatum of Taconic ICR mice. The decrease in excitatory amino acid transporter-2 (or glutamate transporter-1) expression and increase in glutamate release were attenuated by CPG, sulfasalazine or xCT knockout. In addition, CPG, sulfasalazine or xCT knockout significantly protected against dopaminergic loss (i.e., decreases in tyrosine hydroxylase expression and immunoreactivity, and an increase in dopamine turnover rate) induced by MA. However, CPG, sulfasalazine or xCT knockout did not significantly affect the impaired glutathione system [i.e., decrease in reduced glutathione (GSH) and increase in oxidized glutathione (GSSG)] induced by MA. Our results suggest that Sxc mediates MA-induced neurotoxicity via facilitating oxidative stress, microgliosis, proapoptosis, and glutamate-related toxicity.
Effect of swaging on Young@?s modulus of β Ti-33.6Nb-4Sn alloy
Hanada, S.,Masahashi, N.,Jung, T.K.,Miyake, M.,Sato, Y.S.,Kokawa, H. Elsevier 2014 Journal of the mechanical behavior of biomedical m Vol.32 No.-
The effect of swaging on the Young's modulus of β Ti-33.6Nb-4Sn rods was investigated by X-ray diffraction, thermography, microstructural observations, deformation simulator analysis and cyclic tensile deformation. Stress-induced α'' martensite was stabilized by swaging, dependent on the diameter reduction rate during swaging. Thermography and deformation simulator analysis revealed that swaged rods were adiabatically heated, and consequently, stress-induced α'' underwent reverse transformation. Young's modulus, which was measured by the slope of the initial portion of the stress-strain curve, decreased from 56GPa in the hot-forged/quenched rod to 44GPa in the rapidly swaged rod with a high reduction rate and to 45GPa in the gradually swaged rod with a low reduction rate. The tangent modulus, which was measured by the slope of the tangent to any point on the stress-strain curve, decreased with strain even in the linear range of the stress-strain curve of the hot-forged/quenched rod and the rapidly swaged rod, while the tangent modulus remained unchanged for the gradually swaged rod. It was found that Young's moduli in swaged β Ti-33.6Nb-4Sn rods were affected by stabilized α'' martensite. Low Young's modulus of 45GPa and high strength over 800MPa were obtained when the reverse transformation by adiabatic heating was suppressed and the stress-induced α'' was sufficiently stabilized by gradual swaging to a 75% reduction in cross section area.
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
INFLUENCE OF THE MIXING RATIO OF DOUBLE COMPONENTIAL FUELS ON HCCI COMBUSTION
S. SATO,S. P. KWEON,D. YAMASHITA,N. IIDA 한국자동차공학회 2006 International journal of automotive technology Vol.7 No.3
For practical application on the HCCI engine, the solution of subjects, such as control of auto-ignition timing and avoidance of knocking, is indispensable. This study focused on the technique of controlling HCCI combustion appropriately, changing the mixture ratio of two kinds of fuel. Methane and DME/n-Butane were selected as fuels. The influences, which the mixing ratio of two fuels does to ignition timing, ignition temperature, rate of heat release and oxidation reaction process, were investigated by experiment with 4-stroke HCCI engine and numerical calculation with elementary reactions.
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>