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A Study on the influence of the pollutants from Naejang Sightseening Area to Naejang Reservoir which is the source of Water Supply System of Jeong-ju City was carried out, and obtained results are as follows; 1. The water quality of Naejang Reservoir is belong to the third grade of water supply source in dry weather, but it is to the second grade of that in wet weather. 2. The pollutant loading to Naejang Reservoir is 36.98-BOD/day, and the loading is concentrated on October and November. 3. The pollutant loading from Naejang sightseeing Area to Naejang Reservoir is about 53% of whole pollutant loading. 4. The pollutant loading to Naejang Reservoir will be increased year by year.
The characteristics of brewery wastewater and its treatability by aerobic submerged biofilter filled with gravels were examined, and following results were ontainde; 1. The BOD_5:N:P ratio of the raw wastewater was 100:6.0:1.8 and it was 100:75:20 of the anaerobic digestion effluent. 2. Deoxygenation Coefficient for raw wastewater and its supernatant was 0.08d^-1 and 0.134d^-1 respectively, and for digested wastewater and its supernatant was 0.023d^-1 and 0.044d^-1 respectively. 3. In the treatment of raw wastewater, above 95% of BOD_5 removal ratio was obtained under the operation of 0.197kg-BOD/kg-MLVSS-d and 6 days retention time. In the treatment of the anaerobic digestion effluent, above 90% of BOD_5 removal ratio was obtained under the operation of 0.074kg-BOD/kg-MLVSS-d and 436 days retention time. 4. The removal ratio of nitrogen and phosphate was 70% and 78% respectively for raw wastewater, and it was 72% and 94% for anaerobic digestion effluent. 5. As the volume of submerged biofilter is enough with 1/7 of activated sludge aeration tank, the treatment by submerged biofilter is a economical process.
The laying cost for the pipe line pressed by a pump is depend on the costs for the pump and pipes. The most economical pipe diameter is obtained when the summation of costs for the pump and pipes is minimum. Author studied on the most economical pipe diameters of PVC and cast-iron pipe lines in the water supply works, and obtained the general and occasional formula based on our social situations.
In order to research the purification characteristics of contact stabilization process, some experiments were carried out. In these experiments, the variations of COD, COD removal efficiency, DO uptake rate, MLSS and SVI in accordance with time lapses after feedings and COD loading rates were studied. Also the DO uptake rates during the sedimentations of activated sludges were studied. The results of these studies were satisfactory and expectable to be used effectively for the modeling of contact stabilization process.
Many Korean traditional Buddhist temples have legends related with their temples' construction which comes down for a long time. The legend on the temple construction is one of the ways to input sacredness which architecture could not self-generate. to Buddhist temple. Background why the Buddhist temple built on the site are included in these legends, such that the temple site was the land where Buddha had been stayed at in the past, or where miracle had been appeared at the site, or supreme being had been assigned for that site. Within these legends, order of space had been acquired through religious fighting against heretic or evil dragon which occupied holy space, and sacredness of Buddhist temple had been supplemented by Buddha or Bodhisattva's help in the process of temple construction. Story of life sacrifice and death appeared in these legends is a narrative way to add permanent sacredness to Buddhist temple. A legend on temple construction is upaya (tool) that choose a particular region in this world and declare Buddhist temple a sacred space.
Conventional oxidation ditch process has many advantages, but it has also some defects. The main defects are that conventional oxidation ditch process needs large area for oxidation ditch and big power for aeration, In the improved oxidation ditch process, the depth of ditch should be deep and aeration rotor should be improved. In this papaer, the logical method for power calculation of aeration rotor is discussed. It is indicated that the equation for the calclation of needed power of aeration rotor can be derived from drag force of rotor. The drag coefficient of standard rotor of TNO is also calculated and following facts are clarified; the larger the immersion depth of aeration rotor is, the larger the drag coefficient becomes, and the larger the revolution speed is, the smaller the drag coefficiont becomes, and the drag coefficients of aeration rotor lie in the rangeof 0.57~1.18 correspording to its immersion depth and revolution speed, in the case of standard aeration rotor of TNO.
To improve the defects of conventional oxidation ditch process, it is necessary to increase the depth of oxidation ditch and to alter the rotor form of TNO. In this paper, the standard cross section of the ditch and improved aeration rotor is proposed and their oxygenation cap-acity, velocity of mixed liquor in the ditch and power requirement are examined. The results obtained are as follows ; Generally, the larger the immersion depth and rotation speed are, the larger the oxygenation capacity of aeration rotor becomes, and the aeration efficiency is large when the rotation is lower than 80 rpm. If the standard ditch section of Fig. 4, and cage form aeration rotor of TNO is adopted and used with 16cm immersion depth and 75 rpm rotation of aeration rotor, it is presumed that the oxygenation capacity for organic wastewater equivalent to 466 men's and sufficient velocity of mixed liquor can be maintained. But, as there is the possibility of the deficit of mixed liquor velocity in the lower parts of the ditch, the cage rotor of TNO should be slightly altered for improved oxidation ditch process.
The relationships among nutrients and water qualities of the twelve reservoirs in The Chonbuk Province were studied, and the obtained results are as follows: 1. In the reservoirs eutrophication is going on, and so the special strategies against it are required immediately. 2. The relationships between nutrients and chllorophil-a or transparency are as follows, log(chl-a)=1.83log(TKN)-4.367 log(chl-a)=1.26log(T.P)-0.70 log(TR)=-0.43log(chl-a)+0.79 log(TR)=-0.67log(T-P)+1.15 In the above equations, chl-a represent for the chlloropyl-a(㎎/㎥), TR for transparency(m), TKN for total kjeldahl nitrogen(㎎/㎥) and T-P for total phophate(㎎/㎥).