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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.
HIGH TEMPERATURE STRENGTH OF HYDROGEN ANNEALED SILICON WAFER
Matsushita, J.,Xin, P.,Hayashi, K.,Fujii, O.,Kawamura, N.,Kawakami, T.,Numano, M.,Kubota, H.,Matsushita, Y. 한국재료학회 1995 Fabrication and Characterization of Advanced Mater Vol.1 No.1
High temperature strength of hydrogen annealed silicaon wafer was investiaged. Wafers were 150mm in diameter, Czochralski-grown(100) silicon crystal. Silicon wafers were annealed at $1200^{\circ}C$ for 1 hour in a hydrogen atmosphere with a heating rate of $10^{\circ}C/min$ and $20^{\circ}C/min$ in an hot-wall furnace. Oxygen precipitate density in slow heating rate sample and rapid heating rate sample were $2{\times}10^{9}/cm^3$ and $3{\times}10^{7}/cm^3$, respectively. Decreasing the heating rate increases the oxygen precipitate density. The strength was measured by the three-point bending test at $1000^{\circ}C$ using strip-shpaped samples cult from silicon wafer. The maximum resolved shear stress($T_{max}$) at the specimen surface converted from the maximum load was dependent on strain rate and oxygen precipitate density constained in the silicon wafer. The $T_{max}$, 20.5 MPa for as-received samples, was reduced to 17.9MPa in slow heating rate sample. On the other hand, the $T_{max}$ was almost the same as 20.3 MPa in rapid heating rate sample under a strain rate of $6.9{\times}10^{-6}/s$ at $1000^{\circ}C$.
T. Matsushita,M.J. Goh,M. Kyotani,K. Akagi 한국물리학회 2006 Current Applied Physics Vol.6 No.5
Polyacetylene lms with vertically aligned bril morphology were synthesized in homeotropic nematic LC (N-LC) solvent, byusing a magnetic eld of 5 T as an external perturbation. Next, helical polyacetylene lms with vertically aligned and screwed brilmorphology were synthesized in macroscopically aligned chiral nematic LC (N.-LC) under magnetic eld. Scanning electron micro-graph (SEM) indicated that the lengths of brils from the substrate were 520l m, depending on polymerization time, acetylenepressure and catalyst concentration.
Vlahakis, C.,Hunter, T. R.,Hodge, J. A.,Pé,rez, L. M.,Andreani, P.,Brogan, C. L.,Cox, P.,Martin, S.,Zwaan, M.,Matsushita, S.,Dent, W. R. F.,Impellizzeri, C. M. V.,Fomalont, E. B.,Asaki, Y.,Barka IOP Publishing 2015 ASTROPHYSICAL JOURNAL LETTERS - Vol.808 No.1
<P>We present initial results of very high resolution Atacama Large Millimeter/submillimeter Array (ALMA) observations of the z = 3.042 gravitationally lensed submillimeter galaxy HATLAS J090311.6+003906 (SDP. 81). These observations were carried out using a very extended configuration as part of Science Verification for the 2014 ALMA Long Baseline Campaign, with baselines of up to similar to 15 km. We present continuum imaging at 151, 236, and 290 GHz at unprecedented angular resolutions as fine as 23 mas, corresponding to an unmagnified spatial scale of similar to 180 pc at z = 3.042. The ALMA images clearly show two main gravitational arc components of an Einstein ring, with emission tracing a radius of similar to 1 ''.5. We also present imaging of CO J = 10 - 9, J = 8 - 7, and J = 5 - 4 and H2O (202-111) line emission. The CO emission, at an angular resolution of similar to 170 mas, is found to broadly trace the gravitational arc structures but with differing morphologies between the CO transitions and compared to the dust continuum. Our detection of H2O line emission, using only the shortest baselines, provides the most resolved detection to date of thermal H2O emission in an extragalactic source. The ALMA continuum and spectral line fluxes are consistent with previous Plateau de Bure Interferometer and Submillimeter Array observations despite the impressive increase in angular resolution. Finally, we detect weak unresolved continuum emission from a position that is spatially coincident with the center of the lens, with a spectral index that is consistent with emission from the core of the foreground lensing galaxy.</P>
Plasma-Confinement Physics Study in Compact Helical System
stoichi Okamura,A. Fujisawa,A. Shimizu,C. Takahashi,C. Suzuki,H. Iguchi,H. Nakano,H. Matsushita,K. Nagaoka,K. Matsuo,K. Ida,K. Toi,K. Nakamura,K. Matsuoka,M. Yoshinuma,M. Isobe,M. Takeuchi,R. Ikeda,S. 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.49 No.III
In a CHS experiment, various types of transport barrier have been studied. An internal transport barrier (ITB) for electrons in a stellarator was first found in CHS, and the ITB for improved ion confinement was also found. H-mode (edge transport barrier) study in CHS showed many common features in transition to tokamak experiments, although the magnetic surface quantities are very different. Discharges with a combination of ETB and ITB were also found. Two heavy ion beam diagnostics in CHS showed a new direct measurement of zonal flow structure in toroidal confinement. The relation between the fluctuation and the transport barrier was also studied.
Measurement of Unbound Excited States of ^(24)O
추경호,사토,T. Nakamura,N. Aoi,방형찬,S. CHOI,S. Deguchi,F. Delaunay,J. Gibelin,T. Honda,M. Ishihara,Y. Kawada,Y. Kondo,T. Kobayashi,N. Kobayashi,F. M. Marques,M. Matsushita,Y. Miyashita,T. Motobayashi,Y. Nak 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.23
The unbound excited states of the most neutron-rich oxygen isotope, ^(24)O (Z = 8, N = 16), have been investigated using the ^(24)O(p,p') ^(24)O^* → ^(23)O+n reaction at RIKEN, where a 63 MeV/neuclon secondary beam of ^(24)O was produced in a Be production target by the projectile-like fragmentation of a 95 MeV/u ^(40)Ar primary beam. The first excited 2^* state was observed in the invariant mass spectrum. This experiment will give us a deeper understanding of the new magic number at N=16 in the neutron-rich oxygen isotopes.
Measurement of Unbound Excited States of 24O
Tshoo, K.,Satou, Y.,Nakamura, T.,Aoi, N.,Bhang, H. C.,Choi, S.,Deguchi, S.,Delaunay, F.,Gibelin, J.,Honda, T.,Ishihara, M.,Kawada, Y.,Kondo, Y.,Kobayashi, T.,Kobayashi, N.,Marques, F. M.,Matsushita, M Korean Physical Society 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 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.