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반응소결법에 의해 제조된 Fe-Al 합금 예비성형체의 특성에 미치는 제인자의 영향
주형곤,박성혁,주성민,최답천 ( Hyung Gon Joo,Sung Hyuk Park,Sung Min Joo,Dap Chun Choi ) 한국주조공학회 1997 한국주조공학회지 Vol.17 No.1
N/A The main aim of the present study is to investigate the effects of several processing parameters on the characteristics of Fe-Al alloy preform manufactured by reactive sintering process. The processing parameters include preform composition of 25, 40, 50, 60 and 75at.%Al, compacting pressure of 10, 20 and 30㎏/㎠, and mean Al particle size of 29, 66 and 187㎛. Mean Fe particle size was 39㎛. The density of preform processed under same compacting pressure was not affected by changing Al composition. The preform with Al compositions of 25, 40, 50 and 60at.%Al swelled after reactive sintering process, thus having lower density than the green compacts. The preform with Al compositions of 75at.%Al, however, shrinked after reactive sintering process, thus having higher density than the green compacts. Ignition temperature increased with increasing compacting pressure, and increased with increasing Al composition at the fixed compacting pressure. And adiabatic temperature decreased with increasing compacting pressure at the fixed Al composition, and increased with increasing Al composition at the fixed compacting pressure. The size of compound particles increased with increasing Al composition. Especially, The size of compound particles increased largely in the case of 75at.%Al. It was observed that 50at.%Al preform have three dimentional network structure having a homogeneous and fine decreasing Al particle size.
비교란 Lysimeter를 활용한 논 토양에서의 살충제 Tricyclazole의 용탈특성
주형곤 ( Hyeonggon Joo ),임성진 ( Sungjin Lim ),박정훤 ( Jeonghwon Park ),오영탁 ( Youngtak Oh ),이민호 ( Minho Lee ),윤효인 ( Hyoin Yoon ),최근형 ( Geunhyoung Choi ),류송희 ( Songhee Ryu ),박병준 ( Byungjun Park ) 한국환경농학회 2018 한국환경농학회 학술대회집 Vol.2018 No.-
This study was conducted to investigate the leaching characteristics of insecticide tricyclazole in paddy soil using undisturbed lysimeter. Soil horizons of sandy loam, loam, and silty clay loam lysimeter were composed of 6, 6, and 5, and clay contents were ranged from 53.1-63.2, 40.2-47.7, and 32.6-39.2%, respectively. Bulk densities of each lysimeter were 1.38, 1.30, and 1.35 Mg/m<sup>3</sup>, respectively. Tricyclazole was treated to each lysimeter at 15 days after rice planting, and water was supplied according to rice cultivation method. Pore volumes of sandy loam, loam, and silty clay loam lysimeter were calculated to 718.87, 764.15, and 735.85 L, and pore volume numbers of supplied water for rice cultivation were 0.98, 1.08, and 0.24, respectively. Movement of tricyclazole in each lysimeter was investigated through the residue of it in 30, 55, 85, and 125 cm soil water from topsoil and leaching water. Gas chromatography (GC) was used for tricyclazole analysis in water sample. Recovery and limit of quantitation (LOQ) of tricyclazole in water were 107.9-114.9% and 3 μg/L. Changes of moisture tension, humidity, and temperature in sandy loam, loam, and silty clay loam lysimeter was not significantly different during experiment period. Weight of silty clay loam lysimeter was higher than other lysimeter because of less leaching. Leaching volume of sandy loam, loam, and silty clay loam lysimeter were 705.9, 828.7, and 174.5 L, respectively. Total leaching content of tricyclazole (treatment content 770.57 mg) during experiment period in sandy loam, loam, and silty clay loam lysimeter were 0, 12.37, and 13.72 mg, respectively. Most of leached tricyclazole were detected at early stage of experiment in loam and silty clay loam lysimeters. These results showed that the movement of tricyclazole in sandy loam, loam, and silty clay loam paddy soil was very high.
주형곤 ( Hyeonggon Joo ),임성진 ( Sungjin Lim ),오영탁 ( Youngtak Oh ),구명화 ( Myounghwa Ku ),이민호 ( Minho Lee ),윤효인 ( Hyoin Yoon ),최근형 ( Geunhyoung Choi ),류송희 ( Songhee Ryu ),박병준 ( Byungjun Park ) 한국환경농학회 2017 한국환경농학회 학술대회집 Vol.2017 No.-
This study was conducted to develop the simultaneous analysis of veterinary pharmaceuticals (VPs) in soil. The method for VPs in soil was developed and validated by LC-QTOF-MS. The method was established using solid phase extraction (SPE) cartridges. Efficiency of cartridges was tested in view of recovery and relative standard deviation (RSD). Hydrophilic lipophilic balance (HLB) cartridge was showed the higher result than that of tested other SPE cartridges. Recovery and limit of quantitation (LOQ) of tested 13 VPs in soil were 72.3-117.090.4% and 0.038-3.8 μg/L, respectively. The precision was reliable since RSD percentage (1.6-5.3%) was below 20, which was the normal percent value. The results showed that the developed method might be used the monitoring of VPs in soil.
국내 논토양 및 밭토양 중 농약유래 잔류성유기오염물질의 노출량 평가
임성진,오영탁,노진호,김승용,주형곤,이민호,윤효인,최근형,류송희,박병준,Lim, Sung-Jin,Oh, Young-Tak,Ro, Jin-Ho,Kim, Seung-Yong,Joo, Hyeong-Gon,Lee, Min-Ho,Yoon, Hyo-In,Choi, Geun-Hyoung,Ryu, Song-Hee,Park, Byung-Jun 한국환경농학회 2017 한국환경농학회지 Vol.36 No.3
BACKGROUND:This study was conducted to investigate residual organochlorine pesticides (ROCPs) in agricultural soils and crops. Agricultural soil samples and crop samples were collected from 93 cities and counties. METHODS AND RESULTS: Extraction and clean-up for the quantitative analysis of ROCPs were conducted by the modified quick, easy, cheap, effective, rugged, and safe (QuEChERS) method. Recovery and limit of detection (LOD) of ROCPs in agriculturalsoils and crops were 76.5-103.0 and 75.2-93.2%, 0.01-0.08 and $0.10-0.15{\mu}g/kg$, respectively. Detected ROCPs in agricultural soils were ${\alpha}$-endosulfan, ${\beta}$-endosulfan, and endosulfan sulfate, the residue were 2.0-12.0, 1.2-53.1, and $2.2-329.8{\mu}g/kg$, respectively. But these pesticides in all green perilla leaf and green pepper samples were not detected. CONCLUSION: These results showed that ROCPs residues in agricultural soils were not as high as crop safety threatening.
반응소결법으로 제조한 Al 기 복합재용 Fe-Al 합금 예비성형체의 특성평가
최답천(Dap Chon Choi),박성혁(Sung Hyuk Park),주형곤(Hyung Gon Joo) 한국주조공학회 1999 한국주조공학회지 Vol.19 No.6
Squeeze casting was used for fabricating a light metal base composite having high strength and wearresistance. Reactive sintering was used to prepare the preform of Squeeze casting. To utilize Fe-Al intermetallic compounds and SiC particle as a reinforcement, there needs to prepare Fe-Al mixed powder at 50, 60, 70at.%Al, and add SiC powder to the above mixture at 4, 7, 16, 24wt.%. The prepared mixture with SiC was reactive sintered in a tube furnace at 660˚C to get a porous hybrid preform of intermetallic compound and SiC. The preform prepared above was placed in a metal mold, preheated at 660˚C AC4C matrix was injected into the mold with the temperature of the melt at 616˚C After these processes, 66MPa was applied to the mold for 5 minute to finish the whole procedure. The maximum reaction temperature was increased with the increased Al amount, but decreased with the increased SiC amount. The density of the preform was decreased with SiC amount increase in the compacts due to swelling of the preform. An optical microscope was applied to observe the micro structure and the dispersion of the reinforcements. To analyze phases, We utilized XRD, EDS. Hardness test were chosen to get the information of mechanical properties. There were no significant changes in micro structure between the composite and preform. However, it was shown that uniform dispersion of the reinforcers and complete infiltration of the melt into the preform were achieved through the procedure of the squeeze casting. It was observed that the hardness of the composite is decreased with increased SiC amount, resulting from the volumetric expansion of the preform. (Received October 29 , 1999)
비교란 Lysimeter를 활용한 밭 토양에서의 살충제 Chlorpyrifos 용탈특성 구명
윤효인 ( Hyoin Yoon ),임성진 ( Sungjin Lim ),오영탁 ( Youngtak Oh ),구명화 ( Myounghwa Ku ),주형곤 ( Hyeonggon Joo ),이민호 ( Minho Lee ),최근형 ( Geunhyoung ),류송희 ( Choi Songhee Ryu ),문병철 ( Byeongchul Moon ),박병준 ( Byungj 한국환경농학회 2017 한국환경농학회 학술대회집 Vol.2017 No.-
This study was conducted to investigate the leaching characteristics of insecticide chlorpyrifos in upland soil using undisturbed lysimeter. Soil horizons of sandy loam, loam, and silty clay loam lysimeter were composed of 6, 6, and 5, and clay contents were ranged from 5.0-12.0, 7.0-12.0, and 25.0-37.0%, respectively. Bulk densities of each lysimeter were 1.40, 1.41, and 1.45 Mg/m3, respectively. Chlorpyrifos was treated to each lysimeter at 14 days after Chinese cabbage planting, and water was supplied according to Chinese cabbage cultivation method. Pore volumes of sandy loam, loam, and silty clay loam lysimeter were calculated to 718.9, 701.9, and 679.3 L, and pore volume numbers of supplied water for Chinese cabbage cultivation were 0.48, 0.53, and 0.38, respectively. Movement of chlorpyrifos in each lysimeter was investigated through the residue of chlorpyrifos in 30, 55, 85, and 125 cm soil water from topsoil and leaching water. Liquid chromatography (LC)-quadrupole time of flight (QTOF)-mass spectrometry (MS) was used for chlorpyrifos analysis in water sample. Recovery and limit of quantitation (LOQ) of chlorpyrifos in water were 95.0-102.1% and 0.01 μg/L. Changes of moisture tension, humidity, weight, and temperature in sandy loam, loam, and silty clay loam lysimeter was not significantly different. Leaching volume decreased with increasing clay content of upland soil, and the volume of sandy loam, loam, and silty clay loam lysimeter were 343.1, 372.3, and 256.3 L, respectively. Total leaching content of chlorpyrifos (treatment content 770.5 mg) during experiment period in sandy loam, loam, and silty clay loam lysimeter were 0.028, 0.034, and 0.024 mg, respectively. The content in three lysimeter was not significantly different. However, chlorpyrifos in soil horizon of sandy loam, loam, and silty clay loam upland soil were detected at 307.0, 191.3, and 137.6 μg, respectively. These results showed that the movement of chlorpyrifos in sandy loam, loam, and silty clay loam paddy soil was very low because the pesticide was steadily detected in soil horizon and leachate at 150 days after treatment.
비교란 Lysimeter를 활용한 논 토양에서의 제초제 Butachlor의 용탈특성
박정훤 ( Jeonghwon Park ),임성진 ( Sungjin Lim ),오영탁 ( Youngtak Oh ),주형곤 ( Hyeonggon Joo ),이민호 ( Minho Lee ),윤효인 ( Hyoin Yoon ),최근형 ( Geunhyoung Choi ),류송희 ( Songhee Ryu ),박병준 ( Byungjun Park ) 한국환경농학회 2018 한국환경농학회 학술대회집 Vol.2018 No.-
This study was conducted to investigate the leaching characteristics of herbicide butachlor in paddy soil using undisturbed lysimeter. Soil horizons of sandy loam, loam, and silty clay loam lysimeter were composed of 6, 6, and 5, and clay contents were ranged from 53.1-63.2, 40.2-47.7, and 32.6-39.2 %, respectively. Bulk densities of each lysimeter were 1.38, 1.30, and 1.35 Mg/m3, respectively. Butachlor was treated to each lysimeter at 15 days after rice planting, and water was supplied according to rice cultivation method. Pore volumes of sandy loam, loam, and silty clay loam lysimeter were calculated to 718.87, 764.15, and 735.85 L, and pore volume numbers of supplied water for rice cultivation were 0.98, 1.08, and 0.24, respectively. Movement of butachlor in each lysimeter was investigated through the residue of it in 30, 55, 85, and 125 cm soil water from topsoil and leaching water. Gas chromatography (GC) was used for butachlor analysis in water sample. Recovery and limit of quantitation (LOQ) of butachlor in water were 88.1-104.6% and 3 μg/L. Changes of moisture tension, humidity, and temperature in sandy loam, loam, and silty clay loam lysimeter was not significantly different during experiment period. Weight of silty clay loam lysimeter was higher than other lysimeter because of less leaching. Leaching volume of sandy loam, loam, and silty clay loam lysimeter were 705.9, 828.7, and 174.5 L, respectively. Total leaching content of butachlor (treatment content 770.57 mg) during experiment period in sandy loam, loam, and silty clay loam lysimeter were 0.01, 0, and 0.07 mg, respectively. These results showed that the movement of butachlor in sandy loam, loam, and silty clay loam paddy soil was low.
비교란 Lysimeter를 활용한 밭 토양에서의 살균제 Flutolanil 용탈특성 구명
임성진 ( Sungjin Lim ),박정훤 ( Jeonghwon Park ),오영탁 ( Youngtak Oh ),주형곤 ( Hyeonggon Joo ),이민호 ( Minho Lee ),윤효인 ( Hyoin Yoon ),최근형 ( Geunhyoung Choi ),류송희 ( Songhee Ryu ),박병준 ( Byungjun Park ) 한국환경농학회 2018 한국환경농학회 학술대회집 Vol.2018 No.-
This study was conducted to investigate the leaching characteristics of fungicide flutolanil in paddy soil using undisturbed lysimeter. Soil horizons of sandy loam, loam, and silty clay loam lysimeter were composed of 6, 6, and 5, and clay contents were ranged from 53.1-63.2, 40.2-47.7, and 32.6-39.2 %, respectively. Bulk densities of each lysimeter were 1.38, 1.30, and 1.35 Mg/m3, respectively. Flutolanil was treated to each lysimeter at 15 days after rice planting, and water was supplied according to rice cultivation method. Pore volumes of sandy loam, loam, and silty clay loam lysimeter were calculated to 718.87, 764.15, and 735.85 L, and pore volume numbers of supplied water for rice cultivation were 0.98, 1.08, and 0.24, respectively. Movement of flutolanil in each lysimeter was investigated through the residue of it in 30, 55, 85, and 125 cm soil water from topsoil and leaching water. Gas chromatography (GC) was used for flutolanil analysis in water sample. Recovery and limit of quantitation (LOQ) of flutolanil in water were 72.8-84.0% and 3 μg/L. Changes of moisture tension, humidity, and temperature in sandy loam, loam, and silty clay loam lysimeter was not significantly different during experiment period. Weight of silty clay loam lysimeter was higher than other lysimeter because of less leaching. Leaching volume of sandy loam, loam, and silty clay loam lysimeter were 705.9, 828.7, and 174.5 L, respectively. Total leaching content of flutolanil (treatment content 770.57 mg) during experiment period in sandy loam, loam, and silty clay loam lysimeter were 5.66, 15.76, and 21.05 mg, respectively. These results showed that the movement of flutolanil in sandy loam and silty clay loam paddy soil was high.