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- 저자 : 曺楨植 (검색결과 388 건)
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조정식,이경록,임종성,김재덕,최대기,이윤용,전해수 ( Jeong Shik Cho,Kyong Rok Lee,Jong Sung Lim,Jae Duck Kim,Dae Ki Choi,Youn Yong Lee,Hai Soo Chun ) 한국화학공학회 1993 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.31 No.4
High pressure vapor-liquid equilibria for CO₂-C₂H_5OH-H₂O and CO₂-C₂H_5OH systems were measured using a circulation type of apparatus in which both vapor and liquid phase were continuously recirculated. The conditions to obtain the high ethanol concentration were also investigated. It was possible to concentrate ethanol above the atmospheric ethanol-water azeotropic composition(89.4 ㏖%) when the system pressure was below the critical pressure(P_(c, m) = 0.1203T-29.44) of CO₂-C₂H_5OH system at which vapor-liquid two phases were coexisted at the ethanol high concentration regime. In the relationships between separation factor(ethanol to water) and ethanol solubility in the supercritical fluid phase, it was found that the calculated values by Patel-Teja equation of state had same errors quantitively with the experimental data, but qualitively represented the similar tendencies.
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망상어 척출자궁(剔出子宮)에 대(對)한 자율신경계(自律神經系)의 작용(作用)
조정식,Cho, Jyoung-Sick 대한약리학회 1970 대한약리학잡지 Vol.6 No.1
The author studied the actions of autonomic drugs on the uterine muscle isolated from Ditrema temmincki Bleeker, and the results obtained were summerized as follows. 1) The motility of the fish uterus was stimulated by epinephrine, norepinephrine and phenylephrine, but inhibited by isoproterenol. 2) The inhibitory effects of isoproterenol on the fish uterus was not affected by phenoxybenzamine, but blocked by propranolol. 3) The excitatory effects of phenylephrine on the fish uterus were blocked by phenoxybenzamine, but stimulated by propranolol. 4) The excitatory effects of epinephrine and norepinephrine were reversed by phenoxybenzamine and stimulated by propranolol. 5) The motility of the fish uterus pretreated with phenoxybenzamine and propranolol was not affected by isoproterenol, phenylephrine, epinephrine and norepinephrine. 6) It seemed that the uterine muscle of the fish had both alpha excitatory and beta inhibitory receptors. 7) The motility of the uterus of the fish was stimulated by acetylcholine. The stimulating action of acetylcholine was antagonized by atropine. 8) The motility of fish uterus was not affected by nicotine and DMPP. The actions of these drugs were not affected by pretreatment with hexamethonium and atropine. 9) It is, therefore, concluded that there are not present ganglia cells furnished with cholinergic fiber in the uterine wall of the fish.
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조정식,김철영 한국세라믹학회 1993 한국세라믹학회지 Vol.30 No.4
Properties in terms of the variation of the glass compositions, which were density (p), molar volume(Vm), atom/ion packing density (Dp), refractive index (nD), transformation temperature (Tg), dilatometric softening point (Td), thermal expansion coefficient (α), Young's modulus (E), and knoop hardness (KHN) were investigated in CaO-SiO2 glasses and CaO-P2O5-SiO2 glasses containing less than 10mole% of P2O5. Those properties were measured by density measurement kit, Abbe refractometer, dilatometer, ultrasonic pulse echo equipment, and micro hardness tester. When CaO content was increased in CaO-SiO2 glasses, p, Dp, nD, Tg, Td, α, E and KHN were increased, while Vm was decreased. When P2O5 was added to the CaO-SiO2 glasses with constant CaO/SiO2 ratio as 1.07, p, Dp, nD, Tg, Td, α, E and KHN were decreased, while Vm was increased. When the amount of P2O5 in glasses was kept constant, the changes of the properties with variation of CaO content in the CaO-P2O5-SiO2 glasses were very similar to those of CaO-SiO2 glasses. These phenomena could be explained by the structural role of P2O5 in the CaO-P2O5-SiO2 glasses, which was polymerization of siicate structures and resulted in [PO4] monomer structure in glasses. Due to this structural characteristics, the bond strength and packing density were changed with compositions. Proportional relationships between 1) np and Dp, 2) Tg, Td, α and CaO content, 3) E and Vm-1, and 4) KHN and P2O5 content were evaluated in this investigation.
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조정식,김철영 한국세라믹학회 1993 한국세라믹학회지 Vol.30 No.6
The bioactivity of glasses in the CaO-SiO2 system and CaO-P2O5-SiO2 system with less than 10mol% of P2O5 was investigated by in vitro test in simulated body flood(SBF). The formation of Ca.P film and hydroxyapatite on the surface of glasses after in vitro test was analysed by X-ray photoelectron spectoscopy (XPS), fourier transform infrared reflection spectroscopy (FT-IRRS), energy dispersive X-ray spectroscopy (EDS), and scanning electron microscopy (SEM) observation. In the early stage of Ca.P film formation after in vitro test for CaO-SiO2 and CaO-P2O5-SiO2 glasses, the rate of Ca.P film formation on the surface of the glasses was dependent of structural parameter (Y) evaluated from the glass composition. First, in the case of the glasses having Y value below 2, Ca.P film and SiO2-rich layer were formed simultaneously, and there were no differences of the rate of Ca.P film formation in terms of the Y values. Second, in the case of the glasses having Y value above 2, the SiO2-rich layer was formed, and then Ca.P.Si mixed layer was formed in the silica gel structure of the SiO2-rich layer, and finally the Ca.P film on the surface of SiO2-rich layer. The rate of Ca.P film formation delayed as the Y values increased. The rate of hydroxyapatite formation of glasses (the rate of transformation from Ca.P film to hydroxyapatite) seems to be propotional to the rate of Ca.P film formation and Y value. The rate of hydroxyapatite formation of glasses belonging to the second group was delayed as structural parameter increased, and the hydroxyapatite crystal showed spherical growth in the early reaction stage, and then showed silkworm-like linear growth as the reaction time increased.
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$CaO-P_2O_5-SiO_2$계 유리의 형성 및 구조
조정식,김철영 한국세라믹학회 1992 한국세라믹학회지 Vol.29 No.9
The glass formation and structural change with the glass compositions were investigated in the CaO-P2O5-SiO2 system with less than 40 wt% of P2O5. The glass formation range was determined by XRD, SEM and EDS techniques for water quenched specimens. The structural analyses were made for binary CaO-SiO2 glasses and ternary CaO-P2O5-SiO2 glasses by using FT-IR and Raman spectroscopy. The glass formation was affected by CaO/SiO2 mole ratio, P2O5 content and primary crystalline phase. The stable glass formation range was found when the transformed CaO/SiO2 mole ratio (new factor derived from structural changes) was in the range of 0.72~1.15 with less than 10 mol% of P2O5. The structural analyses of CaO-SiO2 glasses indicated that as the CaO/SiO2 ratio was increased, the nonbridging oxygens in the structural unit of the glasses were increased. With addition of P2O5 to CaO-SiO2 glasses, the P2O5 enhanced the polymerization of [SiO4] tetrahedra unit in CaO-SiO2 glasses, which contained a large portion of nonbridging oxygen. The phosphate eliminated nonbridging oxygens from silicate species, forcing polymerization of silicate structures and produced in [PO4] monomer in glasses. When added P2O5 was kept constant, the structural change with various CaO/SiO2 ratio was very similar to that of CaO-SiO2 glasses.
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조정식 광주대학교 산업기술연구소 1995 産業技術硏究 Vol.5 No.-
회분식 튜브형태의 반응기를 이용하여 아임계 및 초임계수증기 분위기에서 리그닌시료의 액화와 아르곤 분위기에서 열분해를 행하였다. 반응온도 674K에서 열분해보다 초임계수증기분위기에서 훨씬 높은 오일수율을 얻었고, 오일수율은 반응온도, 반응시간, 물의 밀도 및 첨가물(CO, Na2CO3, HCl)에 영향을 받았다. UV곡선으로 부터 비교적 긴 반응시간에서 오일의 메톡시그룹이 분해됨을 알았으며, 아세틸환 전후의 오일에 대한 IR곡선으로 부터 초임계수증기 분위기에서 리그닌의 가스분해 반응을 확인하였다. Liquefaction of lignin samples at the atmosphere of subcritical and supercritical water as well as pyrolysis in an argon atmosphere was carried out using a batch tube-type reactor. At reaction temperature 674K, much higher oil yields were obtained with supercritical water than with pyrolysis. Oil yield was affected by reaction temperature, reaction time, water density and additives(CO, Na2CO3, HCl). UV spectra shows that methoxyl groups of the oil were decomposed at relatively long reaction times. It was identified from IR spectra of pre-and post-acetylation for the oil that yje lignin was reacted by hydrolysis at the atmosphere of supercritical water.
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