• Title/Summary/Keyword: CoS

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Synthesis of Silicon Carbide Whiskers (I) : Reaction Mechanism and Rate-Controlling Reaction (탄화규소 휘스커의 합성(I) : 반응기구의 율속반응)

  • 최헌진;이준근
    • Journal of the Korean Ceramic Society
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    • v.35 no.12
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    • pp.1336-1336
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    • 1998
  • A twt -step carbothermal reduction scheme has been employed for the synthesis of SiC whiskers in an Ar or a H2 atmosphere via vapor-solid two-stage and vapor-liquid-solid growth mechanism respectively. It has been shown that the whisker growth proceed through the following reaction mechanism in an Ar at-mosphere : SiO2(S)+C(s)-SiO(v)+CO(v) SiO(v)3CO(v)=SiC(s)whisker+2CO2(v) 2C(s)+2CO2(v)=4CO(v) the third reaction appears to be the rate-controlling reaction since the overall reaction rates are dominated by the carbon which is participated in this reaction. The whisker growth proceeded through the following reaction mechaism in a H2 atmosphere : SiO2(s)+C(s)=SiO(v)+CO(v) 2C(s)+4H2(v)=2CH4(v) SiO(v)+2CH4(v)=SiC(s)whisker+CO(v)+4H2(v) The first reaction appears to be the rate-controlling reaction since the overall reaction rates are enhanced byincreasing the SiO vapor generation rate.

Optical Preperties of HgS and HgS : Co Crystals and Films (HgS 및 HgS : Co 결정과 박막의 광학적 특성)

  • 박복남;방태환;김종룡;장우선;최성휴
    • Journal of the Korean Vacuum Society
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    • v.5 no.3
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    • pp.213-217
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    • 1996
  • HgS and HgS: Co crystals and films grown by the slow cooling and the chemical bath deposition method were used to measure their crystal structure and their optical absorption spectra. HgS and HgS: Co crystals are hexagonal structure with the lattice constant $a_0=4.155{\AA}$, $c_0=9.505{\AA}$ for HgS and $a_0=4.148{\AA}$, $c_0=9.462{\AA}$ for HgS and $a_0=4.135{\AA}$, $c_0=9.442{\AA}$ for HgS: Co, respectively. The optical energy gap of these crystals are given as 2.040 eV for HgS and 1.900 eV for HgS: Co, and the optical energy gap of these films were 2.440 eV for HgS and 1.940 eV for HgS: Co at room temperature, respectively.

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Influence of Marital Conflict on Children's Aggression: The Mediation Effect of Co-Parenting (부부갈등이 아동의 공격성에 미치는 영향: 부부공동양육의 매개효과)

  • Jang, Mi-yeon;Choi, Mi-Kyung
    • Human Ecology Research
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    • v.53 no.5
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    • pp.567-580
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    • 2015
  • This study examines the relation of marital conflict, co-parenting, and children's aggression and the mediating role of co-parenting between marital conflict and children's aggression. Participants consisted of 380 elementary school fifth, sixth graders (152 male and 228 female students) and their mothers from Seoul, Gyeonggi-do, and Gyeongsangnam-do. Children completed questionnaires on marital conflict and the mothers completed questionnaires on co-parenting and children's aggression. The collected data were analyzed using basic descriptive statistics, Pearson correlation coefficients, and a multiple regression analysis. The Baron and Kenny's method was used to determine the mediating model's significance. It was adapted to SPSS ver. 20.0 for Windows. The major findings were as follows: first, the marital conflict (intensity/resolution) positively influenced children's aggression. Second, supportive co-parenting negatively influenced children's aggression. In addition, the marital conflict (frequency/resolution) negatively influenced co-parenting. Co-parenting (supportive/reprehensive) also played a perfectly mediating role between marital conflict and children's aggression. Marital conflict had an indirect influence through co-parenting on the children's aggression. The results indicate that co-parenting plays a crucial role in the relationship between marital conflict and children's aggression.

Status of the KSTAR Toroidal Field Coil Structure Fabrication

  • Choi, C.H.;Sa, J.W.;Park, H.K.;Hong, K.H.;Shin, H.;Kim, H.T.;Her, N.I.;Yang, H.L.;Kwak, J.H.;Moon, H.G.;Yoon, H.H.;Lee, S.K.;Song, J.Y.;Chu, Y.D.;Hur, D.K.;Nam, K.M.;Koo, B.H.;Lim, J.H.;Lee, J.K.;Kim, N.G.;Jang, S.W.;Kim, H.C.;Ha, E.T.;Bak, J.S.;Lee, G.S.
    • Proceedings of the Korean Nuclear Society Conference
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    • 2005.05a
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    • pp.1036-1037
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    • 2005
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Pressure Dependence on the Aquation of s-cis-[Co(ee)$Cl_2$]+ and s-cis-[Co(eee)$Br_2$]+ ions (s-cis-$[Co(eee)Cl_2$]^+ 및 s-cis-$[Co(eee)Br_2]^+ $착이온의 수화반응에 미치는 압력의 영향)

  • Jong-Jae Chung;Sung-Oh Bek
    • Journal of the Korean Chemical Society
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    • v.32 no.4
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    • pp.318-322
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    • 1988
  • We studied the aquation reaction of s-cis-$[Co(eee)Cl_2]^+$ and s-cis-$[Co(eee)Br_2]^+$ complex ions under the various temperatures and pressures. In these complexes eee is $NH_2-CH_2CH_2-S-CH_2CH_2-NH_2$. The rate law of the aquation reactions of these two complexes obeys $Rate = k_{obsd}$[CO(III)], where rate constants of s-cis-$Co(eee)Cl_2]^+$ and s-cis-$[Co(eee)Br_2]^+$ respectively are $0.687{\times}10^{-4}$ $sec^{-1}$ and $4.10{\times}10^{-4}$ $sec^{-1}$ in condition of 0.1M $HClO_4\;and\;40^{\circ}C$. In the same condition, the activation entropies of s-cis-[Co(eee)$Cl_2$]+ and s-cis-(Co(eee)Br_2$]+ complexes respectively are -15.5 eu and -7.54eu, and the activation volumes are $-4.6cm^3mole^{-1}$ and $-4.2cm^3mole^{-1}$. From these data, we could infer the mechanism of the aquation reaction as the interchange dissociation (Id) mechanism.

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