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磁性 酸化鐵粉體를 使用한 含油分 廢水의 處理에 關한 硏究
柳喆模 서울産業大學校 1982 논문집 Vol.17 No.1
Waste water containing fine oil droplets is often treated by chemical coagulation processes. However, when the above processes are performed by adding fine magnetic powder and suspending them in oily waste water layers, the produced flocks containing oil droplets also include these magnetic powder. Thus coagulated flocks consisting of lil droplets, metal hydroxide and magnetic powder are tightened and sedimented in magnetic field. And these sediments are easily removed by moving magnetic belt or roatating magnetic drum. This paper reports on the fundamental data of above process, the structure of model plants and their operation data.
柳喆模,柳京燮 忠州大學校 1972 한국교통대학교 논문집 Vol.5 No.-
A bubble-cap tray is used in the gas-liquid contacted operation of distillation and absorption, but as a lot of cost of manufacture and repair is required, I made use of a perforted plate of the cheap distillaton plate. I have experimented the bubble cap tray, the sieve tray and the valve tray comparing them with each other. The result is as following. (1) A good effect has becn obtained even if the perforated plate is used without using the bubble cap tray in the ditillation tower. (2) The efficiency of a pipe tray is almost the same as that of the valve tray and the sieve tray. (3) The dry pressure drops in a pipe tray were calculated by the equation(2).
수평전극에서 전기도금시 동반되는 자연대류에 의한 물질전달
김래현,류철모 서울産業大學校 1992 논문집 Vol.35 No.1
The mass transfer accompanied with natural convection was investigated in the case of the electrodeposition of copper ions to horizontal plane electrode. Experimentally, the onset time of natural convection and the periods of generation of buoyant eddies induced by density gradients were measured by the optical method and the current deviation. These results were correlated by the Rayleigh number. Theoretically, based on the above correlated results and the model of the stagnant diffusion-boundary layer, Sherwood number was represented as a function of the Rayleigh number.
Gas分析에 依한 變壓器 內部異常 草期發見에 關한 硏究
柳京燮,蔡萬秉,宋瑋憲,張香東,洪壯厚,沈鶴輔,柳喆模 서울産業大學校 1976 논문집 Vol.9 No.1
For the development of reliability of electric Power supply. It is very important to Predict the internal troubles of the transformer on load as We prevent the accident previously to try the trouble shooting. We have the testing results by gas chromato graph as following Occasion; a) We can predict that H₂CH₄ generated from insulating oil is the symptom of over heated coil produced. b) We can predict that a lot of C₂H₂ and H₂ generated from insulating oil is the symptom of the insulation trouble and pyrolysis of insulating oil by are occured. c) In the case of CO₂ and CO is generated from transformer's insulation oil is the sign of insulation material for example press board and phenol resin over heated.
정석진,이경원,정병옥,류철모 서울産業大學校 1992 논문집 Vol.35 No.1
A series of copolyimides with various compositions were synthesized from pyromellitic dianhydride, benzophenconetetracarboxylic dianhydride, and methylenedianiline in N-methyl pyrrolid by the solution polycondensation followed by heat curing. The synthesized ployamic acids and polyimides were identified by means of FT-IR and elemental analysis, and their thermal properties were characterized by differential scanning calorimeter and thermogravimetric analysis. The experimental results showed that the thermal stabilities of the polyimides were increased with increasement of PMDA units.
폴리프로필렌 필름상에 이크릴산 단량체의 그라프트 공중합
정택상,선호철,류철모 서울産業大學校 1992 논문집 Vol.35 No.1
Graft copolymerization of acrylic acid onto oriented polypropylene film by using benzophenone as a photosensitizer in a aqueous medium was carried out under ultravoilet radiation. The effects of polymerization conditions on graft yields were examined. The graft yield was increased up to limiting point and decreased after the point, as AA concentration and BP concentration were increased. And the graft yield was increased by increasing the reaction time to 150 minutes and leveled off. The graft yield was increased with increasing the reaction temperature up to 50℃ but decreased above that temperature.
에탄올아민과 메틸메타크릴레이트의 에스테르 교환반응에 관한 연구
박근호,손병청,류철모 ( Keun Ho Park,Byoung Chung Sohn,Chul Mo Ryu ) 한국유화학회 1985 한국응용과학기술학회지 Vol.2 No.2
The transesterification reaction between ethanolamine and methyl-methacrylate was kinetically investigated in the presence of various metal acetate catalysts at 110℃. The transesterification was found to obey first-order kinetice with respect to the concentration of ethanolamine and methyl-methacrylate, respectively. By the arrhenius plot, the activation energy has been calculated as 11.9 Kcal with lead acetate catalyst, 14.7 Kcal without catalyst. The reactivities has highest value where the electronegativity and instability constant (Kij) values for the metal acetate catalysts are about 1.6.