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- 검색키워드
- 저자 : 金演斗 (검색결과 58 건)
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김연두,배준현,전천석 충남대학교 자연과학연구소 1984 忠南科學硏究誌 Vol.11 No.2
The method burning completely the sulfur, by using the vanadium pentoxide in a current of the oxygen free of the sulfur dioxide, is employed to form sulfur trioxide. The sulfur trioxide in this gas mixture is absorbed by hydrogen peroxide solution and then converted to sulfuric acid. The sulfur is determined by titrating the sulfuric acid with standard sodium hydroxide solution after eliminating the carbon dioxide on warming.
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金然斗,文炳淳,朴暎淳,金世吉 圓光大學校 韓醫學硏究所 1994 원광한의학 Vol.4 No.1
The present experiment was designed to investigate the effects of Dodamtang(導痰湯) on the hyperlipidemia and intravasculr coagulation induced rabbits. In order to control the precise condition, the experimental rabbits were sypplied with calorie limited food. The hyperlipidemia was induced by oral administration of cholesterol(500㎎/㎏) for 4weeks and the intravascular coagulation was induced by indotoxin injection(0.15㎎/㎏). The therapeutic effects of Dodamtang (250㎎/㎏ and 500㎎/㎏) on the lipid metabolism, histological changes of fat deposition in tissues, and the FDP were studied. The results were summurized as followings : 1. The food efficiency rate was decreased significantly with the increased concentration of Dodamtang. 2. The concentration of the serum glucose and total lipid decreased significantly with the increased concentration of Dodamtang. 3. The arteriosclerosis index for phospholipid (triglyceride/phosphokipid) decreased with the increased concentration of Dodamtang. 4. The concentration of the serum total cholesterol, free cholesterol and the arteriosclerosis index for HDL-cholesterol(LDL, VLDL-chloesterol/HDL-cholesterol) decreased with the increased concentration of Dodamtang. 5. The concentration of the serum total protein decreased significantly with the increased concentration of Dodamtang, however, the metabolic rate of albumin/globulin increased with the increased concentration on Dodamtang. 6. The concentration of the serum creatinine decreased significantly with the increased concentration of Dodamtang. 7. The activities of GOT, GPT, and LDH decreased significantly with the increased concentration of Dodamtang. 8. The fat deposition in tissues decreased significantly with the increased concentration of Dodamtang. 9. The concentration of FDP decreased significantly with the increased concentration of Dodamtang. According to the above results, Dodamtang is assumed to have a curative effects against hyperlipidemia and intravascular coagulation.
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U_(3)O_(8)의 酸溶出에 미치는 酸化鐵 (Ⅲ) 의 影響
金演斗 충남대학교 자연과학연구소 1979 學術硏究誌 Vol.6 No.2
This paper discusses extracting Uranium from U_(3)O_(8) by an oxidzing leach with dilute sulfuric acid. Leaching tests show that the dissolutionrates improve as the Fe_(2)O_(3) is increased-approximately 40 percent o f the uranium is extracted by leaching for 5 hours at 40℃ with 1.84 persent sulfuric acid, under the same conditions the iron(Ⅲ) oxide ranges up the solubilily of U_(3)O_(8) to 57 persent.
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金演斗,李弘,千光鉉 충남대학교 자연과학연구소 1978 學術硏究誌 Vol.5 No.2
Degrees of acid attack to low carbon steels and nitrited steels have been measured in hydrochloric acid solutions. The former shows higher resistance compared to the latter in same experimental conditions.
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전해분석법에 의한 광석중 Nickel의 정량에 관한 연구
金演斗,裵埈鉉 충남대학교 자연과학연구소 1983 忠南科學硏究誌 Vol.10 No.2
The undesirable impurities such as iron cobalt and copper interfere the electrogravimetric determination of nickel from the ores by the depositing theses species on the platinum cathode at same time. To solve this problem, the separation of them with the liquid anion exchanger, Amberlite LA-1, has been attempted. The selective and quantitative result of determination of nickel was obtained by extracting them with 50ml of 5% Amberlite LA-1-Xylene in the concentrated hydrochloric acid solution of the nickel ore.
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ICP-AES에 의한 수중의 금속 산화물 직접분석을 위한 연속흐름 Microwave 용해장치 개발 연구
김연두,이계호,김형승,김동수,박광규,Kim, Yeon Du,Lee, Gye Ho,Kim, Hyeong Seung,Kim, Dong Su,Park, Gwang Gyu 대한화학회 1994 대한화학회지 Vol.38 No.8
수중의 금속 산화물을 신속하고 간단하게 용해시킬 수 있는 연속흐름 마이크로파 용해장치를 개발하였다. 이로서 금속 산화물 입자를 용해시킴과 동시에 유도결합 플라즈마 분광기(ICP-AES)를 이용하여 ON-LINE으로 분석하는 완전 자동화 분석 장치의 개발이 가능토록 하였다. 연속흐름 마이크로파 용해장치는 개방형 튜브 장치와 억제형 튜브 장치로 구분하여 제작하고 최적화 시험을 수행하였다. 개방형 튜브 용해장치의 최적조건은 튜브길이가 30m, 마이크로파 출력 20%, 염산 농도 0.6N, 유속은 3.5ml/min였으며, 억제형 튜브 용해장치는 튜브 길이가 7.2m, 마이크로파 출력 30%, 염산 농도 0.6N, 유속은 3.1ml/min였다. 억제형 튜브 용해장치가 개방형 장치에 비하여 용해시간이 3배 정도 단축되었고 용해시킬 수 있는 시료의 농도 범위도 10배 정도 높았다. 제작된 용해장치의 정밀도는 베치식 용기 용해법과 거의 유사한 결과를 나타내어 Fe, Cu는 5% 정도의 상대 표준 편차값을 나타내었고, Zn,Co는 10%내외로 다소 높게 나타났다. The method described offers rapid and efficient sample preparation using on-line microwave digestion of metal oxides in water sample with direct elemental detection by ICP-AES. The open tubing digestion system(OTD) and the restraint tubing digestion system(RTD) for flow injection(FI) were designed and tested to find the optimum conditions. Comparison of OTD and RTD indicated that RTD was 3 times faster on the digestion time, and 10 times higher on sample mass. Finally, the results of RTD agree well with those by conventional microwave open vessel in all cases and show good precision; Fe and Cu show good with about 5% of RSD, while Zn and Co more or less than 10% RSD.
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키레이트 滴定法에 의한 물중 칼슘, 마그네슘 定量에 있어서 Amberlite LA-2의 利用
김연두,배준현,김학수 충남대학교 1985 忠南科學硏究誌 Vol.12 No.2
This study is on the determination of calcium and magnesium in water at very low concentration. Iron(Ⅲ) was added to the sample, and calcium and magnesium were precipitated with iron by adding sodium carbonate and ammonia water. The precipitates were dissolved in conc-HCI and then Fe(Ⅲ) was removed by extraction with Amberlite LA-2. The residual aqueous solution containing calcium and magnesium were determined. Calcium and magnesium are determined by EDTA method respectively after separating them with sodium oxalate. This method, showing the small average relativity of error (less than 3.0%), is very useful to determine low concentration of calcium and magnesium in the water.
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분광 광도법에 의한 광물중 Nickel정량에서의 Amberlite LA-1의 이용
김연두,김종우,최기영 충남대학교 자연과학연구소 1983 忠南科學硏究誌 Vol.10 No.2
In the selective an quantitative determination of nickel by the dimethylglyoximate complexation from the ores, the undesirable impurities such as iron, cobalt and copper interfere the separation by forming the oximate complexes. To solve this problem, the extraction of these species with the liquid anion exchanger, amberlite LA-1, has been attempted. Nickel was completely separated with dimethylglyoxime in aqueous phase from the sample containing iron, aluminum, chromium, cobalt, copper, zinc and nickel after treating it with 50 ml of 5% amberite LA-1-xylene and the concentrated hydrochloric acid solution.
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분광광도법에 의한 염화철중 규소의 정량에서의 Amberlite LA-2의 이용
김연두,배준현,정현옥 충남대학교 자연과학연구소 1988 忠南科學硏究誌 Vol.15 No.1
For the photometric determination of silicon in the iron(Ⅲ) chloride, the iron(Ⅲ) was extracted to organic phase with Amberlite LA-2 in the cons. HCl solution. In the residual aqueous solution, the silicon was determined by molybdenum blue method. The method was found to be very useful to determine a low concentration of silicon in the concentrated iron sample.
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