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장경환,정경락 전북대학교 공업기술연구소 1991 工學硏究 Vol.22 No.-
The adsorption charateristics of phenol by the surface-moldified and surface-unmodified activated carbon fibers from its aqureous solution was examined. The activated carbons used as an adsorbent were Cellulose activated carbon fiber (Toyobo co, KF-1500) and Phenol activated carbon fiber (Kurary Co. FT #200-15). These activated carbon fibers were treated with nitric acid, hydrogen peroxide, hydrochloric-hydrofluoric acid or hydrogen gas. Through this experiment the adsorption equilibrium relation was correlated by Freudlich equation and its 1/n values were ranged from 0.2462 to 0.4201. The modification of surfaces of the activated carbon fibers caused canges in the amounts of phenol adsorbed by them : H_2 - HCI - HF > H_2 - Unmodified > HCI - HF > Unmodified > H_2O_2 > 1 N HNO_3 > 7N HNO_3 > 13.2N HNO_3 The asdorbed amount is closedly related to the nature of the surface oxides on the modified activated carbon fibers.
장경환,김성종,정경락 全北大學校 1990 論文集 Vol.32 No.-
A new air classifier with cut size smaller than about 10㎛, which allowed rapid classification to avoid the disturbance of particles reagglomeration, was designed and manufactured. The characteristics of the air classifier for fine powders was experimentally investigated. The results of the experimentation could be summerized as follows. 1) As the velocity of laden air was increased, the entrainment of fine particles into the coarse side was impressed.. 2) When the velocity of clean air was equal to the velocity of laden air, the sharpness index was good. 3) By sucking a portion of clean air into the fine side, the entraintment of fine particles into the coarse side was effectively suppressed. 4) The cut size and the classification performance were not affected by feed concentration up to at least 0.3kg/㎥.
수용액중에서 분산제가 초미립자의 분산과 응집에 미치는 영향
황성태,장경환,정경락 全北大學校 1996 論文集 Vol.42 No.-
The dispersibility of ultrafine particles is affected by the kinds and amount of dispersants. The optimum dispersive condition for ultrafine particles was determined from the measurement of the zeta-potential and particle size distribution at concentrations. The zeta-potential and the particle size distribution of dilute suspension was measured using the light scattering method. Also, the influence of kinds and amount of diapersants on the dispersion of TiO_2 fine particle in water is discussed by the DLVO theory. In particular it is shown that the optimum concentration of a dispersant obtained experimentally is approximately in accordance with the concentration of the dispersant showing the maximum total potential energy(V_Tmax) calculated from the DLVO theory which is coincident with the one showing the maximum zeta-potential.
정경락,장경환 全北大學校 1992 論文集 Vol.34 No.-
The adsorption characteristics of phenols by the surface-modified activated carbon fibers from its aqueous solution was examined. Cellulose activated carbon fiber(toyobo Co. KF-1500) was used as an adsorbent, and it was treated with heat, air and helium. Pore-size distribution, BET surface area and surfce acidity were measured. The adsorption isotherms were found to conform with the Freundlich equation and its k values were ranged from 1.5381 to 3.6076 mmol/ g and its 1/ n values were ranged from 0.1798 to 0.3144. The affinity of each adsorbate on activated carbon fiber increased in the order ; Phenol <PCP<PNP. The adsorption capacity decreased when oxidized carbon was used, while it increased when redused carbon was used. The adsorption capacity increased when its surface area increased. It is concluded that the adsorption capacity changes in relation with the surface oxides and the surface area of the activated carbon fiber.
혈관 내 폐 보조장치에서 적혈구의 microencapsulation에 의한 산소전달속도의 향상
박재관,김기범,정경락,장경환 전북대학교 공학연구원 ( 구 전북대학교 공업기술연구소 ) 2002 工學硏究 Vol.33 No.-
In this study, we tried to improve oxygen transfer rate and reduce pressure drop on intravascular lung assist device with microencapsulation of red blood cells, because microcapsulation of red cells reduce blood hemolysis. Hemoglobin was purified from outdated human red blood cells used. Phospholipid was purified from egg yolk. The hemosome was prepared by encapsulation of hemoglobin with phospholipid multilayer, using rotary vacuum evaporator. The function of hemosome was tested by measuring oxygen dissociation curve using blood gas analyzer. Oxygen dissociation curve of hemosome showed the same figure as the curve of normal red blood cells. Pressure drop showed lower use of hemosome rather than normal blood, because viscosity of hemosome are lower than that of normal blood. Also, oxygen transfer rate showed lower use of hemosome rather than normal blood at 2 hour, but it showed higher use of hemosome rather than normal blood after 2 hour. Because microencapsulation of normal red blood cells prevent hemolysis of normal red blood cells.