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이의열,윤경규,심윤진,이어진,이경철,Lee, U.Y.,Youn, K.K.,Shim, Y.J.,Lee, EJ.,Lee, K.C. 국립한국농수산대학교 교육개발센터 2020 현장농업연구지 = Journal of practical agricultural resear Vol.22 No.2
This study was conducted to find out the optimum composition of nursery soil for raising seedling of Zelkova serrata. The treatments were regulated with the three different soil types : full peat moss(PM 100%), peat moss + perlite + vermiculite(1:1:1), peat moss + perlite + vermiculite(1:2:1). The full peat moss(PM 100%) showed the highest photosynthetic activity such as maximum photosynthesis rate(PN max), water use efficiency(WUE), Fv/Fm, PIabs and SPAD value. And also, full peat moss(PM 100%) showed relatively better growth performances. As a result of surveying the whole experiment, full peat moss(PM 100%) soil increases growth performances and enhances overall quality.
이의열,김종하 국립7개대학공동논문집간행위원회 2002 공업기술연구 Vol.2 No.-
The particle erosion by iron oxides such as Fe_3O_4 makes great damage to steam turbine components for power generation. The iron oxides are known to be formed on and separated away from the surface of boiler tubes under elevated temperature, high pressure, and moisture. Damages by these particles increase costs for maintaining and repairing the steam turbines. A general way to decrease the damages is to directly hard-coat the components exposed to particle erosion. Many coatings like nitriding, HVOF, and boronizing have been tried for surface hardening of the components, but the evaluation and comparison of their performances under the condition, in which the steam turbine operates, have not been carried out. Therefore, the particle erosion tester which can offer the condition was developed for evaluating and comparing the performances of the bare Cr/Mo alloy, nitride, 75Cr3C2+25NiCr(by HVOF) and boride. It was observed that the borde coating on the Cr/Mo alloy showed the lowest damages by particle erosion, relative to other coatings and the bare Cr/Mo alloy.