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Preparation of copper nanoparticles with an organic coating by a pulsed wire discharge method
K. Murai,Y. Watanabe,Y. Saito,T. Nakayama,H. Suematsu,W. Jiang,K. Yatsui,심광보,코이치니하라 한양대학교 세라믹연구소 2007 Journal of Ceramic Processing Research Vol.8 No.2
In the pulsed wire discharge method, a coating technique to prepare metal nanoparticles covered with organic matter has been investigated. Copper nanoparticles covered with organic matter have been successfully prepared by evaporation of a copper wire in an oleic acid vapor/mist. The thickness of the coating layer was a few nanometres. The median diameter of the powder was 25 nm, and became 10 nm smaller than that without the coating because of the inhibition of particle growth by the formation of the coating. From phase identification by transmission electron microscopy and X-ray diffraction analysis, it was found that the copper nanoparticles have been passivated and have not been oxidized in over 2 months. In the pulsed wire discharge method, a coating technique to prepare metal nanoparticles covered with organic matter has been investigated. Copper nanoparticles covered with organic matter have been successfully prepared by evaporation of a copper wire in an oleic acid vapor/mist. The thickness of the coating layer was a few nanometres. The median diameter of the powder was 25 nm, and became 10 nm smaller than that without the coating because of the inhibition of particle growth by the formation of the coating. From phase identification by transmission electron microscopy and X-ray diffraction analysis, it was found that the copper nanoparticles have been passivated and have not been oxidized in over 2 months.
Yashiro, S.,Murai, K.,Okabe, T.,Takeda, N. The Korean Society for Composite Materials 2007 Advanced composite materials Vol.16 No.2
This study proposes two new approaches for identifying damage patterns in a holed CFRP cross-ply laminate using an embedded fiber Bragg grating (FBG) sensor. It was experimentally confirmed that the reflection spectrum from the embedded FBG sensor was significantly deformed as the damage near the hole (i.e. splits, transverse cracks and delamination) extended. The damage patterns were predicted using forward analysis (a damage analysis and an optical analysis) with strain estimation and the proposed damage-identification method as well as the forward analysis only. Forward analysis with strain estimation provided the most accurate damage-pattern estimation and the highest computational efficiency. Furthermore, the proposed damage identification significantly reduced computation time with the equivalent accuracy compared to the conventional identification procedure, by using damage analysis as the initial estimation.
Fukui, Y.,Kawamura, A.,Wong, T.,Murai, M.,Iritani, H.,Mizuno, N.,Mizuno, Y.,Onishi, T.,Hughes, A.,Ott, J.,Muller, E.,Staveley-Smith, L.,Kim, S. IOP Publishing 2009 The Astrophysical journal Vol.705 No.1
<P>We compare the CO (J = 1-0) and HI emission in the Large Magellanic Cloud in three dimensions, i.e., including a velocity axis in addition to the two spatial axes, with the aim of elucidating the physical connection between giant molecular clouds (GMCs) and their surrounding Hi gas. The CO J = 1-0 data set is from the second NANTEN CO survey and the HI data set is from the merged Australia Telescope Compact Array ( ATCA) and Parkes Telescope surveys. The major findings of our analysis are as follows: (1) GMCs are associated with an envelope of HI emission, (2) in GMCs [average CO intensity] proportional to [ average Hi intensity](1.1 +/- 0.1), and (3) the HI intensity tends to increase with the star formation activity within GMCs, from Type I to Type III. An analysis of the HI envelopes associated with GMCs shows that their average line width is 14 km s(-1) and the mean density in the envelope is 10 cm(-3). We argue that the HI envelopes are gravitationally bound by GMCs. These findings are consistent with a continual increase in the mass of GMCs via HI accretion at an accretion rate of 0.05 M-circle dot yr(-1) over a timescale of 10 Myr. The growth of GMCs is terminated via dissipative ionization and/or stellar-wind disruption in the final stage of GMC evolution.</P>
K. Asakura,J. Inamori,K. Murai,T. Tanaka,T. Babasaki 전력전자학회 2011 ICPE(ISPE)논문집 Vol.2011 No.5
This paper describes the fuse-blowing characteristics for higher-voltage direct current (HVDC) power feeding systems. We developed a new fuse model, and evaluated the fuse-blowing characteristics and the effect of cable length. From the results, the electrical stability of HVDC power feeding system when a shorting accident or an overcurrent occurs is discussed.