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정동백,조강래 연세대학교 산업기술연구소 1975 논문집 Vol.6 No.1
The performance of centrifugal separator is considered to be one of very important problems in powder industry. In this paper the performance improvement of the centrifugal separator is investigated. At first, the principle of centrifugal separator is discussed, then a conventional separator is improved based on separating principles. Secondly, the performance experiments of both the improved separator and the conventional one were performed with talc and calcium bicarbonate. As the result the improved separator showed the greater separation ability by 3-9 percents than that of the conventional one.
백진,신형식,정동철,김병주 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.54 No.-
In a previous study, we reported on activated polymer-based hard carbons (APHCs), which were prepared using CO2 activation and characterized according to activation conditions, including textural properties such as specific surface area and pore volume. This paper was focused on the correlation between nanostructure and pore development of APHCs by using Cs-corrected-field emission transmission electron microscopy (Cs-corrected FE-TEM) and Raman spectroscopy to supplement the in-depth explanation. In the TEM analysis, the APHCs were observed to contain slit-shaped pores (SPs) and little cylindrical pores (CPs). And Raman spectroscopy was used in order to determine the degree of development of the crystal size (La) in the APHCs. The size of La increased with increasing activation time until it was nearly 3 nm. These small crystallites might cause the SPs development, resulting in the high micropore volume of the APHCs. From a result of Raman analysis, it was confirmed that the La value and the ratio of ID/IG value were in a proportional relation. The reason for this relation is that the La value has grown up to about 3 nm, which is consistent with the Ferrari equation.
정동효,백영진,김상교,신정걸,허재관 한국낙농학회 1992 韓國酪農學會誌 Vol.14 No.3
하절기인 91년 8월 하순부터 5주에 걸쳐, 시판중인 국내 농후발효유 11개회사의 28품목을 수집해 효모에 의한 오염검사와 분리배지 및 분리방법을 비교시험한 결과는 다음과 같다. 1. 총 385개 시료에서의 팽창률은 23% 였으며 복숭아와 열대과일제품이 딸기나 살구제품보다 팽창률이 상대적으로 높았고 제조회사별로도 0∼100%의 큰 차이를 보였다. 2. 산이나 항생물질을 첨가한 배지에서의 효모검출수는 기존의 분리배지와 비교할때 별로 큰차이가 없었으나 세균증식의 억제효과는 큰 것으로 나타났다. 그중에서도 콜로니 크기에 영향을 주지않는 항생물질 첨가배지가 바람직하다고 생각되며, 분산평판법에 의한 것이 주입평판법에 의한 것보다 효모검출수나 콜로니 크기에서 우수하였다. Studies on the swelling of stirred yogurt, isolating media and methods for detection of yeasts in stirred yogurt were carried out on 28 brand of 11 companies. The results obtained were as follows: 1. Among the 385 samples examined, 23% were swelled. Swelling rate of strawberry and apricot yogurts were relatively higher than peach and tropical fruits yogurts. 2. No significant differences were observed in 9 different media for the numbers of yeasts isolated. Acidified media and antibiotic supplemented ones suppressed growth of bacteria. Higher yeast counts and larger colony sizes were obtained in the spread plating technique than in the pour plating technique.