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Effect of Oxide Film of Heat Resistant Alloys on Coke Formation during Naphtha Pyrolysis
Shiratori, Nobuo,Hosoya, Keizo 한국부식방식학회 2002 Corrosion Science and Technology Vol.31 No.5
The coking of cracking furnace tubes has been an important subject of ethylene plants. The coke formations rate on the heat resistant alloys of 20Cr-4.5Al-0.5Y₂O₃ covered with Al₂O₃ oxide film and 25Cr-35Ni covered with Cr₂O₃ oxide film during the thermal cracking of naphtha was quantitatively evaluated at temperatures ranging from 8 10 to 930℃. The experimental results showed that the coke formation rate on 20Cr-4.5Al-0.5Y₂O₃ was lower than that on 25Cr-35Ni because of the difference of a catalytic activity to coke formation, especially in the case of a pre-carburized condition. Namely, the A1201 formed on 2OCr-4.5Al-0.5Y₂O₃ was stable even after carburization treatment and inert for catalytic coke formation, while coke formation on 25Cr-35Ni was under the control of catalytic coke formation, and carburization of 25Cr-35Ni accelerated catalytic coke formation. The stability of Al₂O₃ and Cr₂O₃ in a hydrocarbon with steam environment was thermodynamically calculated in 0.1mol of steam, 0.2mol of ethylene and O.lmol of methane at 1,100℃. The simulation result shows that A1203 is exceedingly stable while Cr₂O₃ could be decomposed partially into chromium carbide. Therefore, it is concluded that Al₂O₃ on 20Cr-4.5Al-0.5Y₂O₃ is more stable than Cr₂O₃ on 25Cr-35Ni. and 20Cr-4.5Al-0.5Y₂O₃ is more resistant to coke formation and carburization than 25Cr-35Ni in a hydrocarbon with steam environment at high temperature.
Effect to optical properties by changing the Al2O3 ratio in K2O-Al2O3-P2O5 glasses
D. Shiratori,Y. Isokawa,H. Samizo,M. Koshimizu,N. Kawaguchi,T. Yanagida 한양대학교 세라믹연구소 2019 Journal of Ceramic Processing Research Vol.20 No.4
In this study, we prepared glasses with the composition of 0.1% Ce-doped (100−x) KPO3-xAl2O3 and investigated luminescent characteristics. The glass samples with different Al2O3 ratio (x = 5, 10, 15, 20, 25, 30 and 40) were synthesized by the melt quenching method. The All samples had high transmittance (80−90%) at wavelengths longer than 350 nm except for x = 40, and by increasing the Al2O3 ratio, the transmittance of the samples was improved. From the measurements of photoluminescence (PL) decay curve, the luminescence decay time was confirmed to be typical for the 5d−4f transition of Ce3+ (~30 ns). The samples showed thermally-stimulated luminescence (TSL), and the sensitivity of dose response was confirmed to be linear in the dose range from 0.01 mGy to 1 Gy for the x = 25 and 30 samples which showed the highest sensitivity among the present samples. The scintillation spectra show the broad luminescence around 300−500 nm, and these emission intensities were increased by increasing the Al2O3 ratio.
시라토리 유지(Shiratori Yuji),민영성(번역자) 부산대학교 법학연구소 2011 법학연구 Vol.52 No.4
일본의 재판원제도는 21세기에 들어 진지하게 논의ㆍ검토된 사법개혁의 일환으로서 2004년에 관련법률이 제정되고 2009년부터 실시되었다. 시민참가에 의해 사법의 민주화와 공판중심의 재판을 실현하고자 하는 목적은 어느 정도 달성되었다. 그러나 동시에, 재판원에 의한 재판을 직업재판관 만으로 구성되는 항소심이 어디까지 파기할 수 있는가, 시민참가재판인 만큼 피해자보호가 경시되게 되는 것은 아닌가, 시민에게 사형의 선택을 맡기는 것이 적당한가 등의 문제점도 부상하고 있다. 2012년의 재검토 시에 바로잡아야 할 과제 또한 적지 않다.