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라덕관,김유봉,허동균 순천대학교 공업기술연구소 1997 工業技術硏究所論文集 Vol.11 No.-
In order to investigate the physicochemical water quality in Seomjin river basin, water quality analysis was undertaken at 11 sites in the main river and side stream from March 1996 to Fab. 1997. The concentration of BOD, SS, DO, T-N, T-P, and E. coli were 0.4~2.6mg/ℓ, 1.0~24.5mg/ℓ, 6.0~13.8mg/ℓ, 0.218~2.928mg/ℓ, 0.002~0.098mg/ℓ, and 15~500MPN/100㎖, respectively. Heavy metals were not detected in sampling sites. The lower parts of Yo-cheon is the most polluted stream among the main river and side stream in Seomjin river basin. In Seomjin river basin, annual average pollution loads in ton/year were estimated to be 1,660.32 of BOD, 6,151.86 of SS, 1,421.80 of T-N, and 28.91 of T-P. It was found that Seomjin river basin was not polluted to any troublesome level for water supply, industrial, irrigation and fishery purposes.
라덕관,박상숙,김유봉,허동균 순천대학교 공업기술연구소 1998 工業技術硏究所論文集 Vol.12 No.-
This study was to investigate the adsorption and movement of Napropamide in soil. In order to find out the adsorption and movement characteristics of Napropamide in soils of sand loam (soil A), silt clay(soil B), and loam (soil C), batch and column tests were performed with respect to shaking time variation, adsorption isotherm, and breakthrough curve. The shaking time to reach the adsorption equlibrium of Napropamide was 12 hours. Freundlich isotherm was fit for the adsorption of Napropamide in soils. soil B had the highest adsorption coefficient of Napropamide, soil Ca and B followed at adsorption isotherm. The slope of breakthrough curve of soil A had the steep, soil C and soil B followed at the adsorption curve. The moving velocity of Napropamide in soils was the lowest of soil B because of its highest adsorption of Napropamide.
라덕관,김기성,허동균 순천대학교 기초과학연구소 1997 基礎科學硏究誌 Vol.8 No.-
In order to investigate the physicochemical water quality in Tamjin river basin, water quality analysis was undertaken at 7 sites from Marc 1996 to Feb. 1977. Water temperature was ranged from 4.0 to 32.0 ℃ and pH varied from 6.7 to 8.5. The concentration of BOD, SS, T-N, and T-P were 0.4∼2.2㎎/ℓ, 1.0∼12.0㎎/ℓ, 0.234∼2.681㎎/ℓ, and 0.003∼0.067㎎/ℓ, respectively. Heavy metals and phenol were not detected in sampling sites. In Tamjin river basin, annual average pollution loads in ton/year were estimated to be 167.12 of BOD, 348.24 of SS, 137.51 of T-N, and 3.49 of T-P.
加壓浮上法과 流動層法을 이용한 活性슬러지 混合液의 固液分離에 관한 比較硏究
羅德寬,李基完 순천대학교 공업기술연구소 1995 工業技術硏究所論文集 Vol.9 No.-
When the concentrated activated sludge was separated by Dissolved Air Flotation(DAF) and Fluidized Bed(FB), the influence factors such as concentration of raw sludge, floating and settling velocity, effluent SS, concentration of floated and settled sludge, and polymer dosage were investigated with experiment. The solid liquid separation of concentrated activated sludge could be barely expected by sedimentation, but it could be easily done by DAF and FB. The sludge in FB was about 6.0%. Settling velocity in FB was about two to three times faster than floating velocity in DAF within the polymer dosage of 5 to 20㎎/l. FB was more effective than DAF for the separation efficiency of sludge. The optimal polymer dosage of DAF and FB were 5 ㎎/ℓl and 20㎎/ℓ, respectively.
羅德寬 全北大學校 1983 論文集 Vol.25 No.-
In order to study for the aeration characteristics, surface aeration equipment of octagonal shape with a draft tube in it was made as a pilot plant. In this equipment, oxygen transfer rate, power consumption, mixing degree, distribution of circulation time, and fluid velocities and behavier were mesured with the various turbine shapes. And the results obtained in these expriments are as follows; 1. Oxygen transfer rate was rapidly incresing at 200 rpm with the various turbine shapes. 2. Mixing degree was complete mixing, respectively. 3. Fluid circulation times in aeration tank were very rapid at 100 rpm with various turbine shapes.
CVD 법으로 제조된 TiO2 광촉매에 의한 에틸렌의 광촉매산화
라덕관,정상철,오미영 한국공업화학회 2001 응용화학 Vol.5 No.2
The Photocatalyzed degradation of ethylene in the gas phase was investigated using titanium dioxide by Chemical Vapor Deposition. Photocatalysts were prepared by depositing anatase TiO₂ film on alumina balls. The initial concentration of ethylene, reaction temperature, flow rate were the factors that had an effect on the decomposition of ethylene. The photocatalytic degradation of ethylene shows the degradation rate increases with decreasing initial ethylene conentration and total flow rate. The degradation rate increases with increasing reaction temperature.
라덕관,김영규 한국지하수토양환경학회 2001 지하수토양환경 Vol.5 No.3
The adsorption and movement characteristics of herbicide pendimethalin was studied in three kinds of soil, sandy loam, silty clay and loam. The results of the batch test and columnexperimentweresummarizedasfollows. The shaking time reached to the adsorption equilibrium of pendimethalin in soils was 6 hours. The adsorption rates of pendimethalin for sandy loam, silty clay and loam were 59.6%, 77.3% and 64.0%, respectively. The adsorption isotherms with the Freundlich equation showed better consistency than that with the Langmuir one. The adsorption coefficients of pendimethalin for soils were 8.0. 16.1 and 9.5. respectively. When breakthrough point was 0.05Co, the breakthrough times reached for soils were 256 minutes, 810 minutes and 420 minutes. respectively. 토양중 pendimethalin의 흡착과 이동특성을 파악하기 위하여 사양토, 미사질토 및 양토를 대상으로 회분식 및 칼럼식 실험을 통하여 얻어진 결과는 다음과 같다. Pendimethalin은 진탕 6시간에서 사양토의 경우 59.6%, 미사질토의 경우 77.3%, 양토의 경우 64.0%가 흡착되어 평형흡착에 근접하는 경향을 나타냈으며, 흡착등온식은 Freundlich식에 잘 일치하였으나, Langmuir식에는 적합하지 않았다. 사양토, 미사질토 및 양토에 대한 pendimethalin의 흡착계수는 각각 8.0, 16.1, 9.5로 나타났다. 흡착칼럼 배출구에서 pendimethalin이 처음 검출된 시간 및 유출량은 사양토의 경우 112min. 700ml, 미사질토의 경우 630min, 2100m1, 양토의 경우 189min, 900ml이었다. 0.05Co를 파과점으로 할 경우 각 토양의 파과점에 도달되는 시간은 각각 256min, 810min, 420min이었다.