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약산성 처리물질을 이용한 SCR 폐촉매에서의 V2O5-WO3/TiO2 재활성에 관한 특성 분석
조희지,윤재랑,한은미,동종인 한국폐기물자원순환학회 2018 한국폐기물자원순환학회 학술대회 Vol.2018 No.05
질소산화물 등의 배출규제 강화로 인한 사용처의 확대로 SCR(선택적 촉매 환원) 촉매 수요가 증가하고 있으며, 이에 따라 폐촉매 발생량도 증가할 것으로 예상된다. 폐촉매는 지정폐기물로 분류되어 처리시에 비용이 발생하여, 물리적으로 재생하여 재사용 하거나 유가금속을 회수하는 방법으로 재활용하고 있다. 그러나 재생의 횟수가 제한적이고, 유가금속 회수는 비용이 고가이며 촉매의 85~90%를 차지하는 TiO2가 폐기된다는 문제점이 있다. 따라서, 본 연구에서는 SCR 촉매를 경제적이며 지속적으로 사용하기 위해 피독된 SCR 촉매 내 피독물질만 화학적으로 수세 및 정제하고 유가금속/TiO2의 함량을 높이는 최적의 세정 용매를 도출하는 촉매 재활성을 위한 기초연구를 수행하였다. 비교대상 촉매인 Poisoned 촉매를 5가지 세정용매로 화학적 처리결과, acetic acid 용매가 V2O5 1.19 wt%의 높은 함량과 57.6%의 높은 피독물질 제거효율을 나타내며 다른 산 처리 용매에 비해 촉매 재생성이 높은 것으로 분석되었다. 세정 용매의 농도와 세정 시간에 따른 V2O5 함량과 피독물질 제거효율에 미치는 영향을 알아보기 위해 각각 변수를 두어 실험을 진행하였다. 본 연구를 통해 0.1 N acetic acid로 처리한 촉매가 가장 높은 NOX전환율을 나타냈으며, 유가금속/TiO2 함량 또한 높게 나타나 본 연구 목표에 가장 적합한 세정용매로 판단되었다.
Assessment of Subsoil Compaction by Soil Texture on Field Scale
조희래,정강호,장용선,한경화 한국토양비료학회 2015 한국토양비료학회지 Vol.48 No.6
It is necessary to assess soil physical properties and crop growth treated by compaction to establish the soil management standard. This study evaluated the bulk density, strength and crop growth after subsoil compaction for sandy loam and loam on the field in Suwon, Korea. The treatments were compaction and deep tillage. Sandy loam and loam were classified to coarse soil and fine soil, respectively, depending on clay contents. In coarse soil, bulk density of compacted plot was 8~17% greater than control and deep tilled plot. The root growth was worse in compacted plot compared with control. In fine soil, plow pan was not observed in deep tilled plot with 5~19% smaller bulk density than compacted plot and control. Deep tillage improved the crop growth. The soil physical properties by compaction were dependent on clay content and crop growth limit depended on the traffic driving.
경사지에서 고추 정식시기에 따른 토양유실과 유출수에 대한 식생피복 효과
조희래(Cho H.R.),하상건(S.K. Ha),현승훈(S.H. Hyun),허승오(S.O. Hur),한경화(K.H. Han),홍석영(S.Y. Hong),전상호(S.H. Jeon),김은진(E.J. Kim),이동성(D.S. Lee) 한국토양비료학회 2010 한국토양비료학회지 Vol.43 No.3
As sloped farmland is subject to runoff and soil erosion and consequently require appropriate vegetative coverage to conserve soil and water, a field study was carried out to evaluate the impact of crop canopy coverage on soil loss and runoff from the experimental plot with three different textural types (clay loam, loam, and sandy loam). The runoff and soil loss were examined at lysimeters with 15% slope, 5 m in length, and 2 m in width for five months from May to September 2009 in Suwon (37° 16" 42.67" N, 126° 59" 0.11" E). Red pepper (Capsicum annum L. cv. Daechon) seedlings were transplanted on three different dates, May 4 (RP1), 15 (RP2), and 25 (RP3) to check vegetation coverage. During the experimental period, the vegetation coverage and plant height were measured at 7 day-intervals and then the "canopy cover subfactor" (an inverse of vegetation cover) was subsequently calculated. After each rainfall ceased, the amounts of soil loss and runoff were measured from each plot. Under rainfall events >100 mm, both soil loss and runoff ratio increased with increasing canopy cover subfactor (R²=0.35, p<0.01, R²=0.09, p<0.1), indicating that as vegetation cover increases, the amount of soil loss and runoff reduces. However, the soil loss and runoff were depending on the soil texture and rainfall intensity (i. e., EI30). The red pepper canopy cover subfactor was more highly correlated with soil loss in clay loam (R²=0.83, p<0.001) than in sandy loam (R²=0.48, p<0.05) and loam (R²=0.43, p<0.1) plots. However, the runoff ratio was effectively mitigated by the canopy coverage under the rainfall only with EI30<1000 MJ mm ha<SUP>-1</SUP> hr<SUP>-1</SUP> (R²=0.34, p<0.05). Therefore, this result suggested that soil loss from the red pepper field could be reduced by adjusting seedling transplanting dates, but it was also affected by the various soil textures and EI30.
Feasibility of Evaluation Methods for Reference Evapotranspiration in Plastic House
조희래,정광호,허승호 한국토양비료학회 2019 한국토양비료학회지 Vol.52 No.3
Irrigation demands (ID) of crops were, traditionally, determined with weather condition and crop characteristics estimated by reference evaopotranspiration (ET0) and crop coefficients (Kc), respectively. In plastic house, the cultivation condition related to water consumption should be considered at establishing irrigation requirement. We assumed two scenarios to reflect cultivation condition on irrigation demands (ID) : i) ID = ET0 × Kcp and ii) ID = ETop × Kcp when ETop and Kcp indicate ET0 measured in plastic house (PH) and Kc for crops cultivated in pH, respectively. The former evaluates ID based on ET0 in open field (OF) and the latter does ID with ET0 in pH. The ET0 was estimated by water balance (WB) equation using lysimeter and FAO Penman-Monteith (FAO PM) equation during Jun. 16th to Oct. 31th. The FAO PM method was found to describe well ET0 in OF during Jun. to Sept., but to overestimate in OF & PH during Oct. because of low temperature for grass growth in Korea. The value of solar radiation and ET0 calculated by FAO PM were high correlation between OF and PH during Jun. to Sept., but different with period, Jun. 16-Jul. 11(1st) and Aug. 22-Sept. 30(2nd). The values of solar radiation were similar during 1st, but lower 35% in PH than OF during 2nd period, on average. The ET0 was lower 18% in PH than OF during 1st (3.15 mm day-1 in OF, 2.55 mm day-1 in PH) and lower 46% in PH than OF during 2nd period, on average (3.66 mm day-1 in OF, 2.00 mm day-1 in PH). It resulted from reduced solar radiation intercepted by plastic film. Based on the results, we concluded that FAO PM eq. was recommendable in calculating ET0 and calculation of ID based on i) ET0 was more acceptable than using ii) ETop. Furthermore, establishing Kcp pairing ET0 would be the next step to complement evaluating ID in pH.
Cholera菌의 重金屬Ion反應에 미치는 培地와 菌處置의 影響
曺喜滿 中央醫學社 1971 中央醫學 Vol.21 No.3
S-, SR-, and R-forms of Vibrio cholerae biotype El Tor strain Ogawa 41 were obtained after culturing the organism successively in immune serum-containing broth. Influences of various culture media on the agglutination behaviour of the organisms were examined, using acrifiavine, lead acetate and manganous chloride as reacting agents. Glucose (1%) had an effect of moderately diminishing the agglutination intensity and titer of SR-form with lead acetate, while lactose (1%) had the contrary effect, i. e., even SR-form becoming agglutinable in manganous chloride solution. Trypsin treatment of the cells also brought about another interesting phenomenon; the differences between form variants in the agglutination degree with lead acetate were considerably dulled, even S-form becoming agglutinable while R-form loosing its spontanous agglutinability.