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Distribution coeffisients of various transition elements with the strong acidic cation-exchanger(Amberlite IR-120, 100-200 mesh)were measured at various concentration of hydrochloric acid, hydrobromic acid and perchloric acid. For the separations of Cr(Ⅲ)-Mn(Ⅱ), Mn(Ⅱ)-Fe(Ⅲ) and Fe(Ⅲ)-Co(Ⅱ) by elution through the resin column, when Ba(Ⅱ) were added to the mixed solution of Cr(Ⅲ)-Mn(Ⅱ), Mn(Ⅱ)-Fe(Ⅲ) and Fe(Ⅲ)-Co(Ⅱ). They were separated respectively into each ion by using the eluent of hydrochloric acid through cation exchange resin column.
Waste vinyls have been one of the serious environmental problem because waste vinyls are very difficult to be bio-degraded when they are landfilled and treatment by incineration are discharged the toxic material including dioxin. Therefore recycling is the best method for the treatment of waste vinyls. Waste vinyls recycling process is classified material recycling, energy recycling and chemical recycling. The chief ingredient of waste vinyls is PE and thermo-plastic resin. A link of material recycling waste vinyls recycling process are easy and are little generated contaminant. In case of waste vinyls recycling process contaminant discharged amount were showed TSP 23.9%, SO_2 12.2%, NO_x 9.9%, CO 2% as compared raw material process.
This study was performed to compare the perceptionsbetween Korean and Japanese agriculture high school students toward their school life. The poll was conducted bysix hundreds and thirty six students attending 6 agricultural high schools in Korea and Japan. Their answers were statistically analyzed using SPSS program.The results were as follows.Few Korean and Japanese students were found to be satisfied with attending their schools. Most of them seemed to be less proud of being at agricultural schools. Korean students were more negative than Japanese students in this tendency.Most of students of two countries were not confident of their school works. They seem to be under pressure of school tests and make little efforts of doing their homeworks. This tendency was moreevidentwith male students thanwith female students in Korea, whereas the tendency was more positivewith female students than with male students in Japan. More students in Korea and Japan were interested in practical courses than in academic courses. Moreover most students wanted to take experiment and practice classes more than the theoretical lecture. There were more students in both countries who wanted to attract more the attention from fellow students than their teachers. It showed that they had a good relationship with colleagues in classes. More students answered that the atmosphere of their classes was usually fairly comfortable.
The purpose of this study is to investigate treatment efficiency in dyeing wastewater treatment by the high rate aeration system(HRA) and a combination of the HRA with manetized wastewater treatment system(MWS). At the hydraulic retention time of 16hr, 24hr, 30hr, BOD removal efficiencies of HRA system were 93%, 96% and 98%, combination of the HRA with MWS system were 94%, 96.8% and 98.2%, resoectively. In case of COD, at the hydraulic retention time of 16hr, 24hr, 30hr, COD removal efficiencies of HRA system were 66%, 77.1% and 83.1%, combination of the HRA with MWS system were 70.2%, 80.1% and 86.6%, resoectively. The comparison of the HRA and combination of the HRA with MWS, effluent BOD of the former was 22.7㎎/ℓ and the latter was 19.4㎎/ℓ, therefore biological treatment efficiency identified to increase by the MWS
This study was conducted batch-type process to remove chlorine for using sub-raw material of cement, dust generated from steel manufacture-collection process. According to increasing reaction time of the dust and extraction solvent, chlorine-extraction of dust was increased slowly, but concentration of Hg, Cd, Mn, Fe were increased too. At the reaction time 2hr, in case of the ratio of 1:1 in dust and extraction solvent, chlorine-extraction concentration was maximum. At the same condition, filtration and drying repeated 7 times. And polymer 30㎎/ℓ was added that chlorine concentration of dust was 850㎎/ℓ.
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고속도로 교통관리 시스템 중에서 교통유고 상 황을 신속히 감지하는 알고리즘은 매우 중요하 다. 유고는 도시가로나 고속도로에서 일상적인 교통혼잡 외에 교통사고, 차량고장, 화물낙하, 도로공사 등으로 일시적으로 도로용량의 감소 를 가져오는 모든 사건을 유고(incident)로 정의 한다. 사고(accident)는 유고의 한 부분으로서 일 반적으로 차량의 접촉 등으로 발생되는 사건을 의미한다. 그래서 사고는 예상치 못한 갑작스러 운 일들을 나타내고 있는 반면 유고는 흔히 일 어날 수 있는 부대적인 사건들이나 중대한 행 사나 사건들을 의미하며 어느 정도 예측을 할 수 있는 사건들도 포함한다.