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조해룡(Hae Ryong Cho),이주희(Ju Hee Rhee),임진희(Jin Hee Lim),김미선(Mi Sun Kim),박상근(Sang Kun Park),신학기(Hak Ki Shin),정향영(Hyang Young Joung),최윤정(Youn Jung Choi) 충남대학교 농업과학연구소 2013 농업과학연구 Vol.40 No.4
A freesia (Freesia hybrida Hort.) ‘Dancing Flame’ was developed for the cut flower in the National Institute of Horticultural Herbal Science in 2007. This hybrid was selected from a crossing between a seedling ‘Vulcano’ and ‘Sailor’, which is scarlet double flowering and purple single flowering, respectively, and ‘Figaro’ which is bright red color and semi-double flowering, in 2000. Morphological characteristics of the selected hybrid were investigated for 3 years from 2005 to 2007, and then it was named ‘Dancing Flame’. ‘Dancing Flame’ had red color (RHS R44B) and single flower with yellow center color (RHS Y9A). The growth of the plant was vigorous and the average height was 93.3 ㎝. The average flower width was 60 ㎜, number of floret per stalk was 14.3, and stalk was 13.2 ㎝ length. The average yield, 7.8 cuttings per plant, was 2.5 stems per plant more than the control cultivar. The average days to first flowering of ‘Dancing Flame’, 133 days, was approximately 5 days earlier than the control cultivar. And its average yield, 7.1 cormlet per plant, was also 2.5 times more than the control cultivar.
고에너지 볼밀링 방법에 의해 얻어진 초미립 AlN 분말의 치밀화 및 미세구조
박해룡,김영도,류성수,Park, Hae-Ryong,Kim, Young-Do,Ryu, Sung-Soo 한국분말야금학회 2012 한국분말재료학회지 (KPMI) Vol.19 No.1
In this study, a high energy ball milling process was employed in order to improve the densification of direct nitrided AlN powder. The densification behavior and the sintered microstructure of the milled AlN powder were investigated. Mixture of AlN powder doped with 5 wt.% $Y_2O_3$ as a sintering additive was pulverized and dispersed up to 50 min in a bead mill with very small $ZrO_2$ beads. Ultrafine AlN powder with a particle size of 600 nm and a specific surface area of 9.54 $m^2/g$ was prepared after milling for 50 min. The milled powders were pressureless-sintered at $1700^{\circ}C-1800^{\circ}C$ for 4 h under $N_2$ atmosphere. This powder showed excellent sinterability leading to full densification after sintering at $1700^{\circ}C$ for 4 h. However, the sintered microstructure revealed that the fraction of yitttium aluminate increased with milling time and sintering temperature and the newly-secondary phase of ZrN was observed due to the reaction of AlN with the $ZrO_2$ impurity.