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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.
Jeon-ju River flows through Jeon-ju City. Raw sewages are discharged from many outfalls of sewers into the river. To study the sanitary engineering characteristics of the river water, author measured the pH, water temperature, dissolved oxygen, biochemical oxygen demand and suspended solids. Microorganisms on the river bed were observed. The runoff, width of flow, depth, velocity and slope of river bed were also measured. The method for predicting the BOD and oxygen deficit at any point of river into which sewages are discharged from many outfalls of sewers was also studied. The results of these studies are as follows ; 1. DO is a convenient index of river pollution due to organic substance. 2. The aeration effect of Jeonju River is high because of the large slope, large velocity, small depth and roughness of river bed. 3. The water quality of the river section which is examined get worse as water flows along the stream. 4. Because of serious pollution, the river is of no use for any purposes except the transportation of sewage under aerobic condition. 5. According to the method proposed by author in this paper, prediction of BOD and oxygen deficit at any point of river into which sewages are discharged from many outfalls of sewers is possible.
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.
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.
Brush aerator is one of the effective aeration apparatus. Present writer studied some problems in the treatment of wastewater by activated sludge process with brush aerator. For aeration characteristics of blush aerator, the influences of aerator immersion depth, of aerator position, and of forms of box-type. aeration tank on the efficiency of oxygen transfer were studied. The oxygen transfer efficiency for the various loading rate were experimented. It was also demonstrated that the length of brush aerator required should be determined rationally accordance with the fluctuation of inlet wastewater and treatment variations.
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.
There are many landscape paintings in Chosun Era, which real architectures in that era are shown in detail. These paintings are good sources for infering figures in the past with addition and subtraction to some extent because traditional architectures have been destroyed or damaged through the long period of time. This study is to look over temple architecture figures in the Chosun era shown on landscape paintings.