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Die - upset법에 의한 Pr - Fe - B자석의 자기적 성질에 관한 연구
이경섭(K. S. Lee),서수정(S. J. Suh),박현순(H. S. Park),이병규(B. G. Lee),정지연(J. Y. Jung) 한국자기학회 1993 韓國磁氣學會誌 Vol.3 No.3
Starting ingot of Pr_(15)Fe_(77)B_8 were prepared by vacuum induction melting under argon atmosphere. The ingot were induction melted in a quartz crucible and then ejected as a molten alloy throuth a 0.6 ㎜ orifice onto a rotating copper wheel. An anisotropic magnet was prepared from ribbon by hot deformation techniques. A fully dense precursor magnet first made by pressing ribbons at 680 ℃ under a pressure of 21.8 ㎏ / ㎟. A substantially oriented magnets were obtained by die-upset under various conditions. As the compression ratio increases, the Br value increases pronouncedly though iHc decreases. Also, XRD analyses show increased diffraction peak from (006). From these results, it can be known that the magnetic easy axis was formed along the compression axis. As the die-upset speed increases, iHc increases though Br decreases. The Br increases up to 750 ℃ of die-upset temperature and above this temperature decreases. The value of 4πMs of the Pr_(15)Fe_(77)B_8 alloy prepared is found to be 11.8 KG. When the alloy was compressed by 0.8 under the die-upset speed of 0.05 m/sec at 750 ℃r B, was 11.0 KG indicating that the alloy has excellent magnetic anistropy. However, this alloy has some limitation because of low iHc.
소선이,마지은,고지윤,김은혜,박현화,서유진,서형은,유은미,이하늬,이혜인,정지연,현혜리,이자형,정덕유,강지숙 이화여자대학교 간호과학대학 2009 이화간호학회지 Vol.- No.43
Purposes :The purposes of this study was to investigate the self-managing status according to the life styles and the diabetic knowledge of early adulthood. The subjects in this study were 240people, the early adult aged twenties to thirties living in the metropolitan area. Data were collected by using self-administered questionnaires that measure about the knowledge of diabetes; the dietetic behavior; the knowledge of diet; the exercise behavior; the knowledge of exercise. Descriptive statistics, t-test, ANOVA, and correlation were used for data analysis. Result :1. At the knowledge of diabetes degree based on the general character, the subjects who had experiences of diabetic education have higher degree of the diabetic knowledge. 2. At the knowledge of diabetes degree according to the life style, the subjects who have regular diet are appeared highly. Also the subjects who don't take much food of animal origin have higher degree. 3. At the knowledge of diet based on the life style, the subjects who don't keep three times meals a day are appeared highly. Also the subjects who have regular diet have higher degree. 4. At the knowledge of exercise according to the life style, the subjects who take extra nutritions 3-4 times a week are appeared highly. Although the subjects tend to know about dietary, exercise and health management, it showed that they actually don't perform what they know in their everyday of life. The reason for this could be the lack of perceived seriousness about diabetes mellitus. Thus as nursing professionals, we should provide them proper health education and support. Moreover, advanced research on the empowerment is warranted.