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片茂實 명지대학교 1979 明大論文集 Vol.12 No.-
황산수소칼슘(KHSO_4) 포화용액으로 부터 증발법으로 KHSO_4 단결정을 최적 조건에서 생성시킨다. 11.25×10^6 렌트겐의 방사선 (r-선) 조사로 생긴 단결정의 방사선 손상은 몇개의 상자성 중심을 형성한다. 그 결정들의 전자 스핀공명 스펙트라를 상온에서 X-띠 전자스핀공명 분석기를 얻는다. 상자 성종들의 전자 스펀공명 (ESR) 피-크들은 무등방성을 보이지만 g=2.0036인 Gauss형 등방성 피-크가 생기는 것은 SO_3-기 때문이다. 회전축 이외 제삼의 축과 자장간에 이루는 여러 각도에서 모든 상자 성종들의 g-값은 그 종들의 무등방성 피ㅡ크들과 SO_3-기의 등방성 피-크간의 거리로부터 구할 수 있다. 결정내에 생성된 기들의 주g-값은 g^2을 Θ에 대하여 도시한 곡선으로부터 계산하였다. 모든 상자 성종들은 대응되는 특성 주-값들로부터 확인되고 결정의 결함구조는 또한 이들 종으로 고찰된다. Single crystals of Potassium Hydrogen Sulfate (KHSO_4) have been grown from the saturated solution by the evaporation method at the optimum conditions. Rad-iation damages in the single crystal caused by r-irradiation of 11.25×10^6 Rentgen have given rise to several paramagnetic centers. Electron spin resonance (ESR) spectra of the crystals are obtained with the X-band EPR spectrometer at room temperature. The ESR peaks of the parmagnetic species are found to be anisotropic but an isotropic peak of Gaussian shape at g=2.0036 is assigned to SO_3- radical.The g-values of the species at various angles between the other axis besides the rotating axes and the magnetic field are obtained from the distances between anisotropic peaks of the species and the isotropic peak of SO_3-radical. The principal g-values of the trapped radicals are calculated from the plots of g^2 vs. All the species are identified with the corresponding principal g-values and the defect structure of the KHSO_4 crystal is also discussed in terms of the species.
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片茂實,姜參龍,徐廷善 명지대학교 1972 明大論文集 Vol.5 No.-
The defect form of the iron oxide system is studied by analyzing the gravimetric analysis of a sample measured by using a quartz microbalance(in a temperature range from O℃ to 1,200℃ under oxygen Pressures from 10^2mmHg to 10^-4 mmHg The Y Values of the formula FeO_1+y, are corretly obtained by this means for various condition of temp erature and pressure The plots of log Y v, s log P0_2 (or log Y=1/nlog Po_2) show linearity and calculates from the slope of the plot is about 1/10 at 1,000℃ The most of physical properties of iron oxide system such as electrical conductivity oxidation mechanism and catalytic effect is also discussed with respect to the defect form or the Y values.
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편무실,김태옥,이영순 명지대학교 1987 明大論文集 Vol.18 No.-
본 연구는 액체이젝터를 사용한 기-액분사반응기에서 비가역 2차액상반응계의 축방향분산계수와 축방향농도분포를 측정하여 액체혼합특성을 해석하였다. 실험결과. 낮은 액체속도에서는 반응기내의 액체혼합특성이 동일하였으나 액체속도가 증가할 수록 기포의 세분화가 이루어 지고 반응기 하부에서의 jet-mixing 으로 인하여 유동지역이 혼합지역과 분산지역으로 분리되었다. 이때 액체반응물의 축방향분산계수는 기체속도와 액체속도가 증가할 수록 감소하였으며 물-공기계에서 보다 상당히 감소되었다. 액체속도가 높은 범위에서 혼합지역은 완전혼합흐름으로 볼 수 있었고 분산지역은 소기포군이 균일한 분포를 유지하는 흐름을 나타 내었다. 또한 혼합지역의 존재로 인하여 비가역 2차반응의 전환율과 축방향농도분포는 상당히 변화하였다. 이때 제시된 액체혼합모델은 실험값과 잘 일치하였다. Liquid mixing characteristics was investigated in gas-liquid jet reactor with liquid ejector as gas distributor. Longitudinal dispersion coefficient and longitudinal concentration distribution of liquid phase were measured for irreversible second order system using saponification of ethyle acetate with sodium hydroxide. For lower liquid flow rate, experimental results showed that liquid mixing characteristics was identical in all section of reactor. As the liquid flow rate increased, however, two different flow zones(mixing zone and dispersed zone) existed with characteristics of bubble breakups and jet-mixing in lower section of reactor. Also longitudinal dispersion coefficient of liquid phase decreased with increasing gas and liquid velocity and it was fairly smaller than that for air-water system. For higher liquid flow rate, the mixing characteristics of mixing zone was regarded as almost completely mixed flow, and the dispersed zone constituted the uniform small bubble flow regime. Futhermore, it could be said that the existence of the mixing zone considerably affected to the overall conversion and longitudinal concentration distribution of liquid reactant. In this condition, the liquid mixing model proposed was well fitted to experimental datas.
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片茂實,呂鐵鉉 명지대학교 1983 明大論文集 Vol.14 No.-
Single crystal of pottassium, Hydrogen, sulfate(KHSO_4) have been grown from the saturated solution by the evaporation method at the optimum conditions. Radiation damages in the single crystal caused by r-irradiation of 11.25×10^6 Rentgen have given rise to several paramagnetic centers. Electron spin resonance (ESR) spectra of the crystals are obtained with the X-bond EPR spectrometer at room temperature. The ESR Reaks of the paramagnetic species are found to be anisotropic but an isatlopic peak of Gaussian shape at g=2.0036 is assigned to SO_3 -radical. The g-values of all the species at various angles between the other oxis besides the rotating axes and the magenetic field are obtained from the distances between anisotropic peaks of the species and the isotropic peak of SO_3 -radical. The principal g-values of the trapped radicals are calculated from the plots of g^2 vs θ. All the species are identibud with the corresponding principal g-values and the defect structure of the KHSO_4 crystal is also discussed in terms of the species.
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片茂實 명지대학교 1976 明大論文集 Vol.9 No.-
Gardenia contains about 20ωt% of Gardenia oil, Ethyl-Ether was selected as solvent for extraction of Gardenia oil from Gardenia particles that was passed 18mesh Tailer style screen. The amount of Gardenia oil extracted from unit Gardenia sample was proportional to the logθ^2.5 of extraction time (θ;10∼240min), the logT^15 of extraction temperature (T;10∼30℃, and the log V^5.2 of volume of solvent (V;10∼200㎖/5g sample). The optimum extraction conditions were 120min 20℃ and 10㎖ of solvent per gr Gardenia particles. Finally, the empirical equation was derived as follow, Y(θ.T.V)??logθ^2.5T^15V^5.2-20.5 The deviation between the experimental value and the one calculated from the equation in effective range is ±0.5% The result of analysis of Gardenia oil were those that the saponification value was 220∼240, the acid value was 65∼72, the iodine value was 46∼52 and the specific gravity was 0.925∼0.945(25℃/25℃).
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