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W.S. LEE(李愚升),Y.C. KIM(金埌椿),B.C. LEE(李秉昶) 한국육종학회 1977 한국육종학회지 Vol.9 No.3
This study was conducted to obtain the basic informations for improvement of garlic varieties. Seven local varieties and twenty belonging to southern and northern ecotypes, respectively were used for this study. Agronomic characters, such as, plant height, leaf length, flower-stalk length, bulb diameter, bulb height, number of clove and bulb weight were determined and phenotypic, genetic and environmental correlations among them were estimated. Variety “Mokpo” in southern ecotype and “Yoeju” in northern seemed to be promising one. These two varieties had smaller number of the second differentiated clove but were comparatively heavier in bulb weight than those of the other varieties tested. Each characters observed in two ecotypes and within a ecotype were very variable. There were the different sign and degree of correlations among some characters in two ecotypes. Bulb weight had positively high correlations with bulb diameter and bulb height.
안수환(S. W Ahn),이병창(B. C. Lee),이윤표(Y. P. Lee),주남진(N. J. Ju) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.5
The commercia] viability of heat exchanger is main]y dependent on their long-tenn fouling characteristics because the fouling increases the pressure loss and degrades the thermal performance of a heat exchanger. An experimental study was performed to investigate the characteristics of fluid flow and heat transfer in a fluidized bed heat exchanger with circulating various solid particles. The present work showed that the drag force coefficients of particles in the internal flow were higher than in the external flow, in addition, the solid particle periodically hitting the tube wall broke the thermal boundary layer. and increased the rate of heat transfer. Particular]y when the flow velocity was low, the effect was more pronounced
황토, 갯벌 및 머드의 중금속 흡착율에 관한 실험적 연구
이인숙(l.S.Lee),이미영(M.Y.Lee),이택중(T.J.Lee),김현정(H.J.Kim),이병창(B.C.Lee),정명상(M.S.Jeong),방은옥(E.O.Bang),송현실(H.S.Song),황혜경(H.K.Hwang),이중호(J.H.Lee),조영채(Y.C.Cho) 대한환경위생공학회 2004 대한환경위생공학회지 Vol.19 No.2
Yellow loess, Tidal plat sediment, and mud are known to be high in adsorption though they have great distinction according to the ratio of clay minerals content and their kinds. Thus one of the samples for this study can be obtained by drying of Yellow loess, Tidal plat sediment, and the mud which is semifinished products that are from the progress of heat treatment and making homogeneity which can be found everywhere in our country. Another sample can be prepared by reducing pollutants with the adsorbent and by burning heavy metals of their own. With the samples, noxious heavy metals such as Pb, Cd, and essential trace elements such as Cu, Fe, Mn by each concentration is tested for adsorption according to pH, the kinds of adsorbents and the amount of injection. With the help of these steps, this study shows that the adsorbents, which are green, reducing the additional pollution and low in price, can be found. It also shows that the optimal condition for removing pollutants can be found and the basic materials for treating water can be offered. The results were as follows;<br/> Yellow loess shows the rates of adsorption by more than 50% and Tidal plat sediment and Mud show it by more than 90%. Thus Tidal plat sediment and Mud are higher than Yellow loess the rates of adsorption.<br/> The pH should be treated in natural condition because the rates of adsorption of Pb, Cd, Cu, Mn excepting Fe in mud is higher in pH 7 than in pH 3 of Yellow loess, Tidal plat sediment, and Mud.<br/> The drying adsorbents are good to use because the rates of adsorption of heavy metals has tendency to be higher in the drying method than in the burning method.<br/> It is considered that the more the amount of the injection of the adsorbent is , the higher the rates of adsorption is, and one gram is reasonable for the amount of the injection of Tidal plat sediment and mud.<br/> Yellow loess is suitable for the treatment of the water that includes low concentration of heavy metals because it has the lower rate of adsorption as the concentration of noxious heavy metals is higher.<br/> It is thought that Tidal plat sediment and Mud is proper for the treatment of the water that includes high concentration of heavy metals because the rates of adsorption has not been changed as the concentration of heavy metals increases.