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Ferrous Oxalate Dihydrate부터 다공질 철분말의 제조 및 소결성
이상엽,이동희,이재영 연세대학교 산업기술연구소 1989 논문집 Vol.21 No.2
A systematic study on the production of fine iron powders containing numerous micro-pores by reduction of ferrous oxalate dihydrate and also on the sintering behavior of their powder compacts to impart uniformly dispersed fine pores in the sintered mass has been carried out. Very fine porous iron powders(B.E.T. size≤0.4㎛, specific surface area 15m²/g) produced from ferrous oxalate dihydrate were resulted from the evolution of gases during reduction process. Powders reduced around 400℃ for 30∼60 min, showed the good sinterability due to a kind of the activated sintering even at low sintering temperature (700-800℃), mainly because of lager surface area and unreacted inclusions.
차대성,이상엽,이동희 연세대학교 산업기술연구소 1989 논문집 Vol.21 No.1
Sinterability and formation of MnBi phase of Mn-Bi magnetic alloys were investigated by means of solid state as well as liquid-phase sintering using the compacts of pure Mn and Bi powders and also the compacts containing a small amount of Zn, Sn or Sb as additive. Compared with the case of pure Mn and Bi compacts, small addition of the third elements enhanced the sinterability of Mn-Bi system because of the improved wettability of liquid Bi to solid Mn. Small addition of the elements did not show any harmful effect on the magnetic properties of the alloys. In the case of the Sn or Sb addition, the ferromagnetic MnBi compound phase was formed during the sintering cycle. But it was found that the addition of Sn to Mn-Bi showed the best results of all. Magnetic properties of this case were as follow:Br=220 Gauss and bHc=140 Oe.
개 이자의 Somatostatin 양성세포의 발달에 관한 면역조직화학적 연구
장인엽,윤상필,정윤영,김종중,문정석,한길현,김영택,안계훈,선희매 조선대학교 부설 의학연구소 1998 The Medical Journal of Chosun University Vol.23 No.2
Cells immnunoreactive for somatostatin(SOM) and glucagon(GLU) were investigated in postnatal day 0, 7, 14, 28, 90, 180 and adult canine pancreas using light microscopic immunohistochemistry. Pancreatic SOM-immunoreactive cells were found in pancreatic acini, pancreatic duct, and pancreatic islet gradually. Pancreatic SOM-immunoreactive cells were more located in pancreatic parenchyme than pancreatic islet throughout pancreas by postnatal day 28. But there was change by the postnatal 3 months : pancreatic SOM-immunoreactive cells were more located in pancreatic islet than acini and duct. It is suggested that the number of the SOM-immunoreactive cells may not increase with age apparently. A small number of SOM-immunoreactive cells that showed GLU-immunoreactivity were also observed in canine pancreatic islet. The physiologic consequences of these changes remain to be determined. These results sugegest that SOM in the developing pancreas may relate to the secretion of pancreatic hormones.
고장식염수가 토끼 빈창자 점막 산호성 과립세포의 미세구조에 미치는 영향
문정석,윤상필,정윤영,허영,장인엽,김종중 朝鮮大學校 附設 醫學硏究所 1998 The Medical Journal of Chosun University Vol.23 No.1
This experiment was performed to study the influence of hypertonic saline on the production of the secretory granules by the cellular organelles of the jejunal Paneth cells of the rabbit fed on the 3 % hypertonic saline. The jejunal mucosae of the experimental rabbits were removed partially in the upper one third of the jejunum and fixed in 2.0% glutaraldehyde for 2 hours, followed by 1% osmium tetroxide fixative for 2 hours. Then they were embedded in epon mixture, cut with ultramicrotome and done uranyl acetate-lead citrate double stain, and observed with JEM100 CX Ⅱ electron microscope. Observed results were as follows: 1. The number of secretory granules of a higher electron density was gradually increased as a whole in the course of time after feeding on the hypertonic saline. 2. After feeding on the hypertonic saline, secretory granules of various sizes with a higher electron density mostly occupied the supranuclear region of Paneth cells, but a few secretory granules of various sizes with low electron density were observed. 3. After feeding on the hypertonic saline, the Goigi complex, the mitochondria and the rough surfaced endoplasmic reticula were gradually figured, especially the cisternae of the rough surfaced endoplasmic reticula displayed polyhedral shapes. 4. Considering the above findings, following the feeding on the hypertonic saline, the function of the jejunal Paneth cells was influenced and secretory granules of various sizes with a higher electron density were more abundant as compared with those of a lower electron density. From the above results, it was considered that the Golgi complex, the mitochondria and especially the rough surfaced endoplasmic reticula were activated to maintain homeostasis. As a result of that, the production and concentration of secretory granules were prominently observed.
브러시레스 DC 모타의 最大起動 토오크를 위한 Hall Effect Sensor와 스테이터 코아 間의 最適配置
權鏞寬,兪榮植,李尙燁 成均館大學校 科學技術硏究所 1992 論文集 Vol.43 No.2
This paper describes how to arrange a hall effect sensor of brushless DC motor for the maximum starting torque and low torque ripple. To decide the optimal positioning of a hall effect sensor, the effect of time constant and hysteresis on hall effect sensor is considered. The 66° (E) is calculated as the optimal positioning between a hall effect sensor and a stator core for the maximum starting torque. But 68° (E) is demonstrated as the real positioning for the maximum starting torque through the test.