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수도에 대한 비소의 피해 및 아연-비소간의 교호작용을 온실실험으로 조사하였다. 비소 피해의 증세는 수도를 시들게 하는 것이었으며 지상부 및 지하부의 생장을 감소시키었다. 비소 피해는 1 ppm의 비소 처리구에서도 관찰되었다. 아연의 시용은 수도의 비소흡수를 억제하지는 못했지만 비소 피해를 완화시키었다. 반면 처리된 비소는 아연의 흡수를 감소시키었으며, 따라서 아연시용의 효과는 비소피해에 의한 아연흡수 감소를 보상하였기 때문이다. 이 시험중 공시토양인 Crowley SiL의 비교적 높은 토양반응에 기인하여 철 결핍증이 관찰되었다. Arsenic toxicity of rice and the interaction between As and Zn were studied in a greenhouse experiment. The symptom of As toxicity of rice was the growth retardation of tops and roots accompanied by wilting. The toxicity was observed even on the 1 ppm arsenic treated soils. Zinc applictiaon reduced As toxicity but it did not depress the As uptake by rice, while As reduced the Zn uptake by rice. There-fore, the applied Zn apparantly conpensated for the depressed Zn up-take due to As toxicity. Iron deficiency was observed during the experiment, and this was probably due to the relatively high soil reaction, pH of the Crowley silt loam.
Energy efficient CO<sub>2</sub> capture is a stringent demand for green and sustainable energy supply. Strong adsorption is desirable for high capacity and selective capture at ambient condition, but unfavorable for regeneration of adsorbents by simple pressure control process. Here we present highly regenerative and selective CO<sub>2</sub> capture by carbon nitrides functionalized porous reduced graphene oxide aerogel surface. The resultant structure demonstrate large CO<sub>2</sub> adsorption capacity at ambient condition (0.43 mmol g<sup>-1</sup>) and high CO<sub>2</sub> selectivity against N<sub>2</sub>, yet retains regenerability to desorb 98% CO<sub>2</sub> by simple pressure swing. This work identifies a customized route to reversible gas capture using metal-free, two dimensional carbonaceous materials, which can be extended to other useful applications.
In this study, hole-boss locking washers were developed to prevent vibrational loosening, and a benchmark test was conducted to compare these washers with existing wedge locking washers, which are imported and high-priced. The developed washers consist of an upper washer with bosses and a lower washer with holes, and the bosses are caught in the holes so that the bolt is not loosened. Additionally, the top side of the upper washer and the underside of the lower washer have small wedges perpendicular to the direction of the bolt loosening, suppressing slips. A test by the Korea Test Laboratory indicated that the ratio of the loosening torque to the joining torque is greater than 70%, confirming that the developed washers have a sufficiently high anti-loosening performance. A Junker test apparatus was manufactured for the testing of vibrational loosening and a test comparison between the proposed washers and the existing wedge locking washers shows that the proposed washers have a slower reduction in the clamping force and a higher loosening-resistance in a vibrational circumstance compared with the wedge locking washers. These results indicate that the developed washers demonstrate a high performance and boast price competitiveness.
오영탁 ( Youngtak Oh ),임성진 ( Sungjin Lim ),김남희 ( Namhee Kim ),양지연 ( Jiyeon Yang ),최근형 ( Geunhyoung Choi ),류송희 ( Songhee Ryu ),문병철 ( Byeongchul Moon ),박병준 ( Byungjun Park ) 한국환경농학회 2016 한국환경농학회 학술대회집 Vol.2016 No.-
This study was conducted to investigate the leaching characteristics of insecticide fenobucarb 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. Fenobucarb was treated to each lysimeter at 14 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 718.9, 764.2, and 735.9 L, and pore volume numbers of supplied water for rice cultivation were 2.1, 1.6, and 1.3, respectively. Movement of fenobucarb in each lysimeter was investigated through the residue of fenobucarb in 30, 55, 85, and 125 cm soil water from topsoil and leaching water. Liquid chromatography (LC)-mass spectrometry (MS)-MS was used for fenobucarb analysis in water sample. Recovery and limit of quantitation (LOQ) of fenobucarb in water were 83.2-84.7% and 50 ng/L. Changes of moisture tension, humidity, and temperature in sandy loam, loam, and silty clay loam lysimeter was not significantly different. Weight of silty clay loam lysimeter was higher than other lysimeter because of less leaching. Leaching volume decreased with increasing clay content of paddy soil, and the volume of sandy loam, loam, and silty clay loam lysimeter were 1964.7, 1868.4, and 1265.6 L, respectively. Total leaching content of fenobucarb (treatment content 1541 mg) during experiment period in sandy loam, loam, and silty clay loam lysimeter were 9.6, 14.2, 21.7 μg, respectively. The content in three lysimeter was not significantly different. Fenobucarb in soil horizon of sandy loam, loam, and silty clay loam paddy soil were detected at 180.1, 54.5, and 0.4 μg, respectively. However, the most of fenobucarb in soil horizon and leaching water detected at the primary stage of experiment. These results showed that the movement of fenobucarb in sandy loam, loam, and silty clay loam paddy soil was very high.