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UO2 및 U1-yCey)O2 소결체의 열팽창 측정 및 평가
김동주,김용수,이영우 한국세라믹학회 2005 한국세라믹학회지 Vol.42 No.5
The linear thermal expansions of UO2 and (U1-yCey)O2 pellet were measured from room temperature to 1400℃as a function of Ce contents (0, 7.63, 14.84 and 21.68 mol%) by using the TMA (Thermo-Mechanical Analysis) method. >From the measured data, the linear thermal expansion rate, the coefficient of linear thermal expansion and density variation with temperature were calculated, and the best-fitted temperature-dependent equations were recommended. It was shown that the rate and coefficient of (U1-yCey)O2thermal expansion increased and the density decreased with increasing Ce contents.
김동주,이원복,라봉진 중앙대학교 의과대학 의과학연구소 1981 中央醫大誌 Vol.6 No.4
The pancreas of human fetuses aged from 6 to 38 weeks were observed for the developmental study ,of the primitive pancreatic ducts, acini, islets of Langerhans, the time of appearance, and morphology of the islet cells. 1. The fusion of the ventral and dorsal pancreata has been encountered on the sixth week of fetal life as an organ containing the primitive pancreatic ducts surrounded by a large amount of loose con nective tissue. The epithelial cells of the ducts are abundant in glycogen. They fused with the neighboring cells with junctional complexes at free surface and with desmosoms at some place deeper into the intercellular space, and the other portion of the intercellular space is slightly widened. The ducts branch to form the lobules and then the lobes in accordance with the increase of fetal age. 2. In the pancreas of the twelfth week of fetus the primitive acinar cells, having many oval or fusiform granules and lamellated granular endoplasmic reticulum, appear around the terminal portion of the primitive pancratic duct and show rapid growth thereafter. 3. The endocrine cells appear in the order of alpha, delta, and beta cells, on the eighth and half, twelfth, and thirteenth week of fetuses, respectively. They proliferate to form the islets which have alpha and delta cells as the major types of the islets, and then become gradually degenerate. New islets which look like the adult islets, and have beta cells as the major type, begin to appear. The alpha cells have small, round granules and the beta cells have granules with crystalline structure as a core.
펄스 SiH₄플라즈마 화학기상증착 공정에서 입자 성장에 대한 펄스 변조의 영향
김동주,김교선 강원대학교 산업기술연구소 2006 産業技術硏究 Vol.26 No.B
We analyzed systematically particle growth in the pulsed SiH_4 plasmas by a numerical method and investigated the effects of pulse modulations (pulse frequencics, duty ratios) on the particle growth. We considered effects of particle charging on the particle growth by coagulation during plasma-on. During plasma-on (t_(on)), the particle size distribution in plasma reactor becomes bimodal (small sized and large sized particles groups). During plasma-off (t_(off)), there is a single mode of large sized particles which is widely dispersed in the particle size distribution. During plasma on, the large sized particles grows more quickly by fast coagulation between small and large sized particles than during plasma-off. As the pulse frequency decreases, or as the duty ratio increases, t_(on) increases and the large sized particles grow taster. On the basis of these results, the pulsed plasma process can be a good method to suppress efficiently the generation and growth of particles in SiH_(4) PCVD process. This systematical analysis can be applied to design a pulsed plasma process for the preparation of high quality thin films.