http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
홍웅기,임제빈 全北大學校 附設 都市및環境硏究所 1998 都市 및 環境硏究 Vol.13 No.1
The Steelmaking slag produced in large quantities is mainly used as a ballast of a pavement road material and a rail road material. But, hydration is proceeded because of CaO content being included in steelmaking slags. So, slaking of slags is becoming problem due to density difference of CaO and Ca(OH)_2. When we utilize steelmaking slags as a ballast, it is necessary to complete hydration. In most cases, various environment problems are caused by natural hydration in each iron mill. Promoting hydration rate is very important method to solve serious problems. As a result of measuring vapor hydration rate of CaO in this experiment, the results are summarized as follows ; 1)Hydration rate equation of CaO is 1-(1-X)^1/3=M_CaO · r_0 and there is maximum of hydration in 200℃. 2) So as to promote hydration, we supposed that to make vapor pressure higher and particle size smaller is effective.
任齊彬,鄭在凡,洪雄基 全北大學校 附設 都市및環境硏究所 1994 都市 및 環境硏究 Vol.9 No.1
Total suspended particulates and concentration of polycyclic aromatic hydrocarbons were measured from April 1992 to January 1993 for analyzing air pollution comparatively in five designated areas in Chonju city: industrial, semi-industrial, commercial, residential, and green area. The concentration o total suspended particulates was estimated up to 201 ㎍ in whole city level. Sixteen polycyclic aromatic hydrocarbons were commonly distributed in the city, especially the concentration greatly increased during the winter. Benzo(ghi)perylene was a major pollutant detected from 0.98 to 1.67ng/㎥ in four tested regions except the green area, in which 0.57 ng/㎥ of fluoranthene was the highest. Benzo(a)pyrene, chrysene, benzo(b)fluoranthene, indeno(1,2,3-cd)pyrene, and dibenz(ah)anthracene known as carcinogenic materials were also included in the samples analyzed. Degree of air pollution determined by total polycyclic aromatic hydrocarbons decreased in the order of 7.80 mg/㎥(commercial) > 7.72ng/㎥(industrial) > 5.71 ng/㎥(semi-industrial) > 4.72 ng/㎥(residential) > 3.21 ng/㎥(green area). Most polycyclic aromatic hydrocarbons were produced from liquid fuel. It is expected that air pollution will increase gradually as consumption of liquid fuel use increases.
任齊彬,金美淑,洪雄基 全北大學校 附設 都市및環境硏究所 1994 都市 및 環境硏究 Vol.9 No.1
The primary pollutants can be converted to acid aerosol or gases by complicated chemical mechanisms which would be scavenged from the atmosphere by the wet and dry deposition. This study is to investigate the factors of rain-water acidity thrugh the correlation between the major chemical components in precipitation process. The results were as follows: 1. PH range of rain-water are 4.26- 6.90. 2. Correlation between [Ca^2+] and [NO_3^-], [Ca^2+] and [SO_4^2-], [Ca^2+] and [cb-ca] are 0.70, 0.86, 0.93, respectively. 3. Correlation between [Na^+] and [CI^-] is 0.83. 4. Correlation between [NH_4^+] and [CI^-], [NH_4^+] and [NO_3^-], [NH_4^+] and [SO_4^2-], [NH_4^+] and [cb-ca] are 0.73, 0.87, 0.71, respectively. 5. Correlation between [cb-ca] and [SO_4^2-] which is calculated from charge balance equation is 0.79. And it seems that [cb-ca] influenced to the pH change, initially [SO_2] absorbed in rain-water. 6. Concentration of [SO_4^2-] increases, by the gaseous reaction of SO_2 oxidation in the period of no-rain-days, and the aqueous reaction in the rain-water. 7. [SO_4^2-]/[NO_3^-]=5 in Chonju, the value of that was 1.32 in Seoul. 8. The factors of pH change are [SO_4^2-] and [cb-ca], especially at the condition of pH < 5.