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$C_{x}F_{y}$ Polymer Film Deposition in rf and dc $C_{7}F_{16}$ Vapor Plasmas
Sakai, Y.,Akazawa, M.,Sakai, Yosuke,Sugawara, H.,Tabata, M.,Lungu, C.P.,Lungu, A.M. The Korean Institute of Electrical and Electronic 2001 Transactions on Electrical and Electronic Material Vol.2 No.1
$C_{x}F_{y}$ polymer film was deposited in rf and dc Fluorinert vapor ($C_{7}F_{16}$) plasmas. In the plasma phase, the spatial distribution of optical emission spectra and the temporal concentration of decomposed species were monitored, and kinetics of the $C_{7}F_{16}$ decomposition process was discussed. Deposition of $C_{x}F_{y}$ film has been tried on substrates of stainless steel, glass, molybdenum and silicon wafers at room temperature in the vapor pressures of 40 and 100 Pa. The films deposited in the rf plasma showed excellent electrical properties as an insulator for multi-layered interconnection of deep-submicron LSI, i.e. the low dielectric constant ∼2.0, the dielectric strength ∼2 MV/cm and the high deposition rate ∼100nm/min at 100W input power.
Effect of Activator on Hydrogen Peroxide Bleaching of White Ledger
Sakai, Kokki,Kondo, Ryuichiro,Ahn, Byoung Jun,Paik, Ki Hyon 한국공업화학회 2001 Journal of Industrial and Engineering Chemistry Vol.7 No.5
The effectiveness of novel activators in the hydrogen peroxide bleaching of white ledger was investigated. With the addition of 1% sodium persulfate, 4% Prestogen EB, and thiourea(molar ratio to residual hydrogen peroxide=1/2) to hydrogen peroxide bleaching, the brightness of the bleached pulps increased by up to 2∼3 points when compared to hydrogen peroxide bleaching with conventional activators. The effectiveness of the activators in enhancing the brightness was in the order of Prestogen EB, thioruea, sodium persulfate and silicates. The strengths of the pulps bleached by hydrogen peroxide with the novel activators were slightly lower or similar to those of the pulps bleached by conventional hydrogen peroxide. In particular, the addition of sodium persulfate produced a more marked decrease in the tensile index of the bleached pulp. Accordingly, sequential oxidative and reductive bleaching with the addition of thiourea to the residual hydrogen peroxide was found to be most effective in view of th bleaching chemical cost, brightness gains, and strength of the bleached pulps.
ATOMIC CARBON IN THE W 3 GIANT MOLECULAR CLOUD
SAKAI TAKESHI,OKA TOMOHARU,YAMAMOTO SATOSHI The Korean Astronomical Society 2005 Journal of The Korean Astronomical Society Vol.38 No.2
We have mapped the W 3 giant molecular cloud in the $C^o\;^3P_1-^3 P_o$ ([CI]) line with the Mount Fuji Submillimeter-wave Telescope. The [CI] emission is extended over the molecular cloud, having peaks at three star forming clouds; W 3(Main), W 3(OH), and AFGL 333. The [CI] emission is found to be strong in the AFGL 333 cloud. We have also observed the $C^{18}O,\;CCS,\;N_2H^+$, and $H^{13}CO^+$ lines by using the Nobeyama Radio Observatory 45 m telescope. In the AFGL 333 cloud, we find two massive cores, which are highly gravitationally bound and have no sign of active star formation. The high [$C^o$]/[CO] and [CCS]/[$N_2H^+$] abundance ratios suggest that the AFGL 333 cloud is younger than the W 3(Main) and W 3(OH) clouds.
Comparative Study on Pitting Corrosion of Copper Tubes in Pitting and Fitting-Free Area
Sakai, Masahiro,Seri, Osami 한국부식방식학회 2002 Corrosion Science and Technology Vol.31 No.3
Field tests for the copper tube in the area where pitting corrosion has often occurred were carried out in order to investigate the initiation and the propagation of pits. For a comparative study, we installed the same field equipment in two areas (pitting and pitting-free areas) to measure the corrosion potential of copper tubes and the electric conductivity of tap water. The electric conductivity in the pitting area was higher than that in the pitting-free area during the whole period of examination. It was found that the pitting corrosion has occurred in both pitting and pitting-& areas, but the maximum pit in the pitting area after 12 months was about three times deeper than that in the pitting-free area after 12 months.