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The Purpose of this research is aimed to find out optimum operating conditions for Phosphorus removal by AB-Process. The Comparision between a partially aerated at B-step and fully aerated AB-Proecess was made at different mixing and aeration time, detention time. The BOD removal efficiency showed up to 90% in the partially aerated at B-step as well as fully aerated process. In the partially aerated process at B-step the substrate removal efficiency remained constant irrespective of anaerobic/aerobic reactor retention time ratios. Phosphorus removal efficiency in the partially aerated process at B-step was higher than that in the fully aerated AB-Process. Phosphorus removal efficiency in the process tended to increase as the anaerobic reactor volume in the B-step increased.
Recently in Korea and developed countries, nitrogen and phophorus removal are the main target to improve effluent qualities, in order to protect discharge basins from eutrofication by N and P. Introduction of an advanced treatment function to existing wastewater treatment systems, which can be removed nitrogen and phophorus as well as BOD, COD and SS, have been required to protect water resources from domestic and industrial wastewaters. For the improvement of effluent quality through nitrogen(N) and phophorus (P) removal, this study conducted to investigate and analyse of the municlpal sewage treatment process such as VIP(Virginia Initiative Plant) process on cost effectiveness operating and improvement of effluent quality. Based on the results of the experiments, The average removal efficiencies of organic matter were BOD 87.4 ~ 91.8%, COD 77.7 ~ 81.3%. At influent concentration of T_-N 41.8mg/l, NH_4-N 36.2 mg/l, T_-P 3.14mg/l and PO_4-P 1.6 mg/l, nutrient removal efficiencies were NH_4-N 95.9%, T_-N 67.8%, PO_4-P 69.9%, and T_-P 70.7%.
In this study, the Classification of Forest Vegetation using field investigation and Landsat TM Data was examined. A merit of the field investigation is obtained detail data but a fault are inaccuracy in broad area, badly economic. A merit of the Landsat TM Image processing are easy collect of data in wide area, easy approach of the investigation area, possibility of repeat investigation.
This study has performed to investigate and evaluate the amount of pollutants and the status of water quality of the Hyung-San River and prediction water pollution loads. In the field survey('94.11-'95.3), mean concentrations of BOD were found 0.78-4.90ppm, respectively, which were exceeding the second grade at inflow point of Sindang stream The predicted BOD pollution loads of Hyung-San river in 1996, 2001, 2006, 2011 were 13,068.3 kg/day, 13,003.1 kg/day, 9,355.6 kg/day, 9,506.6 kg/day.
The purpose of this study is characteristic analysis of municipal sewage with source(union, business, combination and individuality). In the analysis results of union sample, average concentration in business area of TBOD, TCOD_Mn and TCOD_Cr were 190㎎/l, 83㎎/l and 336㎎/lℓ, respectively. And TCOD_Cr /TBOD ratio was 1.8. TBOD of union sample from individuality house area was 99㎎/l. In the analysis results of business area sample, average concentration of TBOD, TCOD_Mn and TCOD_Cr were 127㎎/l, 83㎎/l and 243㎎/l, respectively. Average concentration of T-N was 51.8㎎/l. In the analysis results of combination house area sample, average concentration of TBOD was 128 and TCOD_Cr /TBOD ratio was 1.7. In the analysis results of individuality house area sample, average concentration of TBOD, TCOD_Mn and TCOD_Cr were 87㎎/l, 46㎎/l and 218㎎/l, respectively, and TCOD_Cr /TBOD ratio was 2.5.
지하수 자원의 분포 파악과 효과적인 관리를 목적으로 지하 환경 탐사의 통계적 방법 Kriging을 이용하여 경북 포항시 북부 지역에서 측정된 데이터로(농어촌진흥공사. 1997)부터 지표면으로부터 지하수면 까지의 깊이와 지하수면의 해발 고도 분포를 추정하였다. 이를 위해 국가 GIS 사업중 해당 지역의 1:5000 수치 지도(국립지리원)를 이용하였다. 지하수면 깊이는 대체로 7-9.5 m를 나타내며 산봉우리와 농업 용수 사용량이 많은 것으로 추정되는 지점에서는 9.5 m를 상회하여 나타난다. 지하수면의 고도 분포는 대체로 서쪽에서 동쪽으로 낮아지며 최대 변화율은 동서로 6 km 당 90 m 감소하는 경향을 나타낸다. 이러한 지점에서는 지하수가 하루에 수 m 이동하는 것으로 추정된다. The geostatistical method Kriging is used to estimate the areal distributions of the depth to the water table and the altitude of the water table measured from the sea level. A northern part of the city of Pohang, Kyeong-Buk, Korea has been chosen and the digital map of the area with 1:5,000 scale from the National Geographic Information System (NGIS) project by National Geographic Institute has bun used to reproduce the ground surface distribution. The water table depth appears to be in the range between 7 m and 9.5 m except a few localities where mountain tops exist and the use of groundwater for agicultural purposes is believed to be heavy. The overall distribution of the water table altitude shows a monotonic gradual decrease from the west to the east (seaward direction from the inland) and to the south with maximum rate approximately at 90 m over 6 km in horizontal distance and indicates that the groundwater is moving several meters per day there.
This study was to investigate the element of SO₂, Pb, Zn, Cu, Fe, Mn, Cd and the NaCl concentration in the leaves. The object of this study was Ginkgo biloba, Pinus thunbergii, Platanus occidentalis, Pruns yedoensis and camellia japonica, and these were planted in the city of Pusan. The study considered such factors as the sort of the tree, the month of the survey, the position of the tree. The results of this finding are as follows: The factor of the month indicated that regardless of the sort, the changing quantity of the SO₂ for all surveryed trees continued to increase as the time from Spring to Autumn passed. Particularly, the increase happened to the case of Ginkgo biloba and Platanus occidentalis, but was slow in Pruns yedoensis, Camellia japonica and Pinus thunbergii. SO₂-related standing was placed as follows: Ginkgo biloba for 0.65%, Platanus occidentalis for 0.56%, Pruns yedoensis for 0.31%, Camellia japonica for 0.27% and Pinus thunbergii for 0.25%. For the average content of heavy metal in the leaves the research founded the Fe for 298.5ppm, Mn for 28.2ppm, Zn for 24.9ppm, Cu for 6.8ppm, Cd for 1.44ppm and Pb for 0.91ppm. The Ginkgo biloba out of the surveyed trees indicated the high content of Fe and Cu, and the Platanus occidentalis recorded the high percentage of Mn, Zn and Cd. The findings thus concluded that based on the absorption and accumulation of SO₂ and each heavy metal, Ginkgo biloba and Platanus occidentalis are considered as the best street trees planted in the city. The NaCl concentration of the surveyed areas were proportional to the distance of the seaside. Specifically, the NaCl concentration of June was higher than that of April. The lowest was in August and the highest in October. The standing for the trees was placed as followe: Ginkgo biloba, Pinus thunbergii, Platanus occidentalis, Pruns yedoensis and Camellia japonica.