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김영수,박진식,장성호,장부규,서정민,김장호 동아대학교 환경문제연구소 1996 硏究報告 Vol.19 No.2
This study was carried out to investigate the performance enhancement of forced oxidation operation on the limestone utilization and SO₂ removal efficiency of the pilot flue gas desulfurization system. The results are as follows : 1. The results of the forced oxidation tests have shown that converting from natural to forced oxidation operation can have a significant effect on both limestone utilization and SO₂ removal efficiency of an FGD system. Conversely, if the limestone utilization is maintained at a constant level, the SO₂ removal efficiency will increase. Conversely, if the pH is held constant, the limestone utilization will increase significantly. 2. This characteristic of a forced oxidation system can translate into lower L/G requirements and, therefore, reduced capital and operating costs for slurry recycle pumps. 3. Forced oxidation operation will provide improved limestone utilization and, therefore. reduced limestone reagent costs.
文勝式,鄭場龍,宋瑛敏 진주산업대학교 1983 論文集 Vol.21 No.-
This experiment was conducted to investigate the effects of the additions at the level of 1% Briquette ash (B), sand (S), and formula feed(C). on egg weight, egg production rate, feed conversion and egg quality with a total of 60 pieces Laying hen for 3 treatments during the experimental period of 168 days from May 4, 1983 to Oct. 12, the same year at the brooding laboratory, Dept. of Animal science, Jin Ju Agricultural and Forestry Junior Technical Collage. The results obtained are summarized as follows: 1. The agg production rate at Laying peak period was highest in the B plot and there were significant (P<0.01) difference between the others expect C and B, and at Laying middle period was highest in the B plot and there were significant (P<0.01) difference between the B and S and there were significant(P<0.05) difference between the others plot. 2. Average egg weight at Laying peak and Laying middle period was heavy in the order B(63.50, 65.21), S(63.24, 64.83) and C(62.96, 64.73)(p>0.05) 3. The feed conversion at Laying peak period was B(2.20), S(2.30), C(2.33), and at Laying middle period was B(2.36), C(2.49) and S(2.56). 4. The yolk weight at Laying peak and Laying middle period was heavy in order of C(19.29, 19.21), B(19.17, 19.09) and S(19.15, 19.01), albumen and egg shell weight and thickness was nonsignificant(P>0.05) difference between all the plot.
紡絲工程에서의 Emulsion Fume 處理를 위한 充塡塔 適用에 관한 硏究
최동훈,박진식,장성호,김일배,서정민,김장호 동아대학교 환경문제연구소 1996 硏究報告 Vol.19 No.2
This study was carried out to interpret hydraulic behavior and component analysis of the emulsion fume, laboratory work of mass transfer in the packing tower which packed 50mm plastic Hiflow-ring. The results from experiment are as follows : 1. The component of emulsion fume is Cyclododecane, 1-Tridecene, 4-Nonene 5-butyl. The kinds of Alkene contained approxymately 76.23 percent. 2. To compare with conventional packing, 50mm Hiflow-ring could save energy because of low pressure drop under high load. 3. The unique magnituteds of packing witch was used are as follows. Cv = 5.18 × 10^(-4) , m = 0.683, n=0.462 so we can predict efficiency which occurres. 4. To require plant of the packing tower in the gas capacity factor 2.7 (Kg^(1/2) m^(-1/2) s^(1))
姜榮浩,朴章植,金道聖 대한방사선방어학회 1982 방사선방어학회지 Vol.7 No.1
지표하에서 방출되는 토양기체중의 라돈농도 측정은 환경방사능, 우라늄 탐색, 지진예지 등에 관한 연구에 널리 이용되고 있다. 본 연구에서는 초산 셀룰로우즈(LR115-Type 2와 CA80-15, Kodak Pathe)와 CR-39의 플라스틱 비적 검출기를 부착한 라돈컵을 제작하여 경북일원에서의 토양기체중 라돈농도를 측정하였다. 제작한 다론컵내에는 일정량의 CaSO₄를 건조제로 사용하여 플라스틱 검출기에 미치는 습기의 영향을 감소시켰으며, 라돈컵의 라돈검출 환산인자는 1tr/㎠·30days=1.2.×10()pCi/L였다. 1981년 1월부터 1982년 2월 사이의 대구에서의 평균 라돈농도는 89.1pCi/L였다. 한편 1981년 8월부터 1982년 2월 사이의 대구, 안강, 경주, 포항, 청하, 안동에서의 평균 라돈농도는 각각 31.8pCi/L, 124.5pCi/L, 127.0pCi/L, 79.1pCi/L, 144.4pCi/L, 70.9pCi/L였으며, 이 결과를 TLD에 의한 환경방사능 측정치와 비교하였다. Measurement of the radon concentration close to the ground surface can be used in search of environmental radiation for human safety, exploration for uranium, premonitory signals from earthquakes. We can detect radons in soil gas by alpha particle track method using the plastic track detectors, cellulose nitrate(LR115-Type 2 and Ca80-15, Kodak Pathe) and CR-39. For present works, radon cups having these detectors were made in our laboratory and their conversion factor was determined. A typical conversion factor was 1tr/㎠·30days=1.2×10()pCi/L. In the radon cups, some of CaSO₄were used as desiccant form reducing the moisture effects on plastic track detectors. With these radon cups, underground radon concentrations of Kyungpook area were measured. Average radon concentration in Daegu from Jan. 1981 to Feb. 1982 was 39.7pCi/L. From Aug. 1981 to Feb. 1982, average radon concentration of Daegu, Angang, Kyungju, Pohang, Chungha, and Andong were 31.8pCi/L, 124.5pCi/L, 127.0pCi/L, 79.1pCi/L, 144.4pCi/L and 70.9pCi/L, respectively. The results were compared with the environmental radiation measured by TLD method.
전기집진 장치내의 대전체 극성구조 형태에 따른 집진손실량과 에너지 관계 연구
하상안,박진식,김일배,김장호,장부규,서정민 동아대학교 환경문제연구소 1997 硏究報告 Vol.20 No.2
This stduy carried out to investigate the precipitating loss amount und energy by structural polarity of electrostatic precipitator at the different conditions of precipitatation time, high voltage and gas speed. As part of this wark was the dependence of the amount in the collector zone of a one- and two stage set up feld by precipitating time and gas speed. This advanced Model1 is developed by Research of the different parameter as the conventionnal study of modell. In order to investigate Opeartion efficiency of electrostatic precipitator, the amount of knocking losss was measured with concentration-Measuring of Monitik-treubung.
學校周邊 道路交通 騷音과 學生 聽感反應과의 相關關係 硏究
김종수,최동훈,박진식,김석택,김장호,서정민 동아대학교 환경문제연구소 1997 硏究報告 Vol.20 No.2
For my thesis I have analyzed the differences between the traffic noise level surrounding the schools and the perceived level of noise. I have used the ways of measurement and questionnaires to support my study. According to the analysis, the measured noise level was higher than the expected noise level. The equivalent noise level was proven to be higher when the windows of the classrooms were open. The noise level was also higher on the third floor than the first floor. The correlation between the measured noise level and the perceived level of noise was tested in each school. The school which had a higher expected noise level showed a high perceived level of noise. The measured noise level and the perceived level of noise became larger on the higher floors. Through the questionnaires, the traffic noises were proven to be the largest noise-making source surrounding the schools. Most of the students replied on the questionnaires that they have been consistently bothered by the noise. It interfered with their studies and concentration. Also, the sound of their voices became louder because of the noise around their schools. Therefore, I have come to the conclusion that the traffic noises that surround the schools give the students negative influences.
Jang Sick Park,Se Hoon Ki,Do Young Kim,Eun Ha Choi 한국진공학회 2021 한국진공학회 학술발표회초록집 Vol.2021 No.2
It is necessary to apply high voltage (5kV ~ 50kV) and a high frequency (0 ~ 30kHz) between electrodes(1mm ~ 3cm) to generate non-thermal atmospheric biocompatible plasma(NBP) in dielectric barrier discharge (DBD). When DBD occurs in air, reactive species such as O<sub>3</sub>, NO, N<sub>2</sub>O, NO<sub>2</sub>, OH, O, N etch are generated by ionization, dissociation, excitation of O<sub>2</sub> and N<sub>2</sub> molecule gas. O<sub>3</sub> gas having high oxidation property and long life time (0.5h ~ 25h) has been widely used for sterilization of microorganisms, decomposition of organic compounds, and purification of contaminated water etc for a long time. We simulated the variation of O<sub>3</sub> concentration in the system with pulse power supply of duty ratio of 0.5 ~ 2.5 using chemical reaction equation, atomic oxygen concentration and decay constant. Decay constant was estimated by measuring ozone concentration in sensor apart from plasma source after power off. Simulation results for the ozone concentration were in good agreement with experimental results.