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Fe 기 비정실 합금의 자기특성과 자구에 미치는 Nb 첨가와 열처리 효과
최진학,송진태 대한금속재료학회(대한금속학회) 1987 대한금속·재료학회지 Vol.25 No.2
The effect of Nb element and annealing condition on the magnetic domain properties were investigated in Fe_(80)B_(16)Si₄(at %) amorphous alloy which has high saturation magnetization and low core loss. With increasing Nb contents in (Fe_(1-x)Nb_x)(80)B_(16)Si₄(x=0-0.10) amorphous alloy ribbons, the crystallization temperature increased from 448℃ to 542℃ and soft magnetic properties were improved by decreasing coercive force and increasing maximum permeability. These improvements were attributed to the decreasing of magnetostriction and the reduction of domain width by Nb addition. The annealing treatment also improved the soft magnetic properties of (Fe_(1-x)Nb_x)_(80)B_(16)Si₄ amorphous alloys and the optimum annealing temperature was 425℃-450℃. (Fe_(0.92)Nb_(0.08))_(80)B_(16)Si₄. and (Fe_(0.90)Nb_(0.10))_(80)B_(16)Si₄, amorphous alloys which were annealed at these temperatures had low coercive force and high maximum magnetic permeability. It could be thought that these improvements were attributed to the relaxation of internal stress and were related to the disappearance of maze domain and the for mation of 180˚ domain.
최진학 건국대학교 1975 建農學報 Vol.1975 No.6
The following are the results obtained in the experiment appling several treatments to the pieces of 40g to 50g of the sweet potato, CHUNG-SEUNG #100, in order to prevent them from rotting and to speed their germination in growing the sweet potato for the feed-stuff by the direct planting method. 1. Planting the seed pieces of sweet potato with nontreatment resulted in rotting them and losing the stalks considerably. 2. The treatment of Gibberelin 25ppm aqueous solution didn't have any effecton germination. 3. The treatment of Fermate and Uspulun were effective for preventing the seed pieces from rotting, but it was recognized that they delayed germinations and the first stage growth a little. 4. The curing treatment speeded the formation of wound healing tissue and prevented the seed pieces from rotting, and germination was speeded and the days from planting to germination were shortened during the treatment But the surface of the seed pieces was changed white, dry. and solid. And germination growth after planting was not steady, on the contrary, a tendency to be delayed was found in it.