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노승백 계명대학교 산업기술연구소 1990 産業技術硏究所 論文報告集 Vol.13 No.2
The ability of the Wilson equation to predict vapor-liquid equilibria from heat of mixing data is investigated. The Wilson equation gives reasonable results for Acetone/Carbon Tetrachloride system with heat of mixing less than about 80cal/g-㏖. However, Methanol/Methyl Acetate system, the Wilson equation is unable to describe the heat of mixing data, while the temperature dependent Wilson equation gives an accurate prediction for heat of mixing and vapor-liquid equilibria.
Hydrophobic - Hydrophilic 분체의 계면활성제에 의한 Wettability 연구
노승백,임미애 ( Seung Baik Rho,Mi Ae Lim ) 한국공업화학회 1998 공업화학 Vol.9 No.2
분체 형태의 소수성 고분자 polymethylmethacrylate(PMMA), poly vinyl chloride(PVC)와 친수성 금속 aluminium에 대한 water, glycerol, formamide, diiodomethane, 1,1,2,2-tetrabromoethane, 1-bromonaphthalene, acetone, chloroform, benzene, ethanol과 methanol과의 접촉각을 Washburn식을 기본으로 한 wicking법으로 측정하였다. 또한, 농도에 따른 음이온 계면활성제 SDS(sodium dodecyl sulfate)와 양이온 계면활성제 CTAB(cetyl trimethylamonium bromide) 수용액과의 접촉각을 측정하였다. 유기액체들과의 측정된 접촉각으로부터 Zisman plot을 사용하여 임계표면장력, γc를 예측하였으며, 농도에 따른 계면활성제 SDS와 CTAB수용액과의 접촉각으로부터 adhesion tension plot을 사용하여 γc를 예측하였다. 유기액체, 계면활성제 SDS와 CTAB수용액에 대해서 분체 PMMA의 γc는 각각 43.5, 28.3과 36.2mNm^(-1)이며, 분체 PVC의 γc는 각각 44.2, 28.0과 34.8mNm^(-1)값을 얻었다. 이로부터, 고체 표면의 적심성과 성질이 계면활성제의 첨가에 의해 변화됨을 알 수 있었다. 또한, 측정된 접촉각으로부터 조화평균식을 사용하여 각 고체의 표면자유에너지, γs와 그 성분 값들을 결정하였다. The contact angle on powder hydrophobic polymer PMMA(polymethylmethacrylate), PVC(poly vinyl chloride) and hydrophilic metal aluminium was measured by wicking method on the base of Washbum equation for water, glycerol, formamide, diiodomethane, 1,1,2,2-tetrabromoethane, 1-bromonaphthalene, acetone, chloroform, benzene, ethanol, methanol, and for anionic surfactant SDS(sodium dodecyl sulfate) and cationic surfactant CATB(cetyl trimethylamonium bromide) aqueous solutions with concentrations. The values of γc estimated by Zisman plot and adhesion tension plot for contact angle with organic liquids, SDS, and CTAB aqueous solutions were 43.5, 28.3, and 36.2 mNm^(-1) for PMMA and 44.2, 28.0, and 34.8 mNm^(-1) for PVC, respectively. From the results, it was considered that wettability and characteristics of solid surface were transformed by adding surfactant. The surface free energy, γs and its components of PMMA, PVC, and aluminium were determined using harmonic equation.
VAPOR-LIQUID EQUILIBRIA OF BINARY AND TERNARY SYSTEM METHANOL-METHYLACETATE-BENZENE
노승백 啓明大學校 産業技術硏究所 1990 産業技術硏究所 論文報告集 Vol.12 No.-
The vapor-liquid equilibrium data for the binary and ternary systems composed of methanol, methylacetate, and benzene at the atmospheric pressure are presented. The experimental data of the binary systems were used to calculate the binary parameters of the UNIQUAC, NRTL, Wilson, Van Laar and Margules equation. UNIQUAC parameters have been used to calculate the vapor-phase composition and the vapor-liquid equilibrium temperature are very close to the experimental data for system investigated.
분해성 계면활성제 용액의 물리적 특성 연구 : 계면활성제 및 섬유유연제를 중심으로 Focus on detergent and softener
노승백 啓明大學校 産業技術硏究所 1994 産業技術硏究所 論文報告集 Vol.17 No.-
The purpose of this study is to get the data for the physical properties of surfactant solutions. To this end the properties of synthetic detergent and the fabric softener solution have been analysed with the active metabolites of the Taegu Song-seo wastewater treatment corporation, and their biodegradation characteristics have been noted in relationship with the surface tension. Especially all of the biodegradability of surfactant solution is above 95% after 7 days.
MathCAD로 Peng-Robinson 상태방정식, Wong-Sandler 혼합법칙과 UNIQUAC 식을 이용한 기-액 상평형 예측
노승백 啓明大學校 産業技術硏究所 1999 産業技術硏究所 論文報告集 Vol.22 No.2
The Wong-Sandler mixing rules are theoretically correct in the sense that they reproduce quadratic composition dependence of the second virial coefficient. However, recent studies indicate that the basic premises of these rules break down for highly asymmetric systems and at high pressure. The systems studied have low to moderate asymmetry, It has been observed that the van Laar and UNIQUAC model provides a good representation of GE models and the results obtained from experimental data(2-Propanol/Water, n-Pentane/Ethanol) in spite of the asymmetry inherent to those systems. For the data calculation, Mathcad program is used. The results obtained from this study can be used directly to predict vapor-liquid equilbria involving such systems.
노승백 啓明大學校 産業技術硏究所 1993 産業技術硏究所 論文報告集 Vol.16 No.2
An investigation was conducted of phase inversion of a n-Hexane/water dispersion in a stirred tank. Particular attention was paid to the dispersion types of the system. It was found that critical point of phase inversion was according to the height of stirring impeller and the phenomena of hysteresis was found at aquous volume fraction of 0.714 and 0.788.
노승백(Rho, Seung-Baik),이학일(Lee, Haakil),손기훈(Son, Ki Hun) 한국산학기술학회 2015 한국산학기술학회논문지 Vol.16 No.3
본 논문은 내화물 슬레이트용 고체윤활제를 제조하기 위하여 Starch 및 Graphite의 함량 변화를 통하여 점도, 마찰계 수 및 마모성능을 평가하여 Starch, Graphite와 water 간의 적절한 함량 조합을 찾고자 하였다. 먼저 starch 15 wt%일 때 점도는 graphite 함량에 따라 점도 상승이 커짐을 알 수 있었다. 또한 마찰계수 시험에서는 starch 15 wt%이고, graphite 30 wt%일 때 마찰계수가 가장 적었다. 이는 물의 함량이 줄어들고 고체의 비율이 높아짐에 따라 흡착력이 낮아져 표면에서 피막이 조금씩 탈락되며 마찰계수가 상승하는 것으로 판단된다. 마모 시험결과 starch 15 wt%이면서, graphite 25 wt% 혹은 30 wt%일 때 가장 양호한 결과를 얻었다. In order to produce an optimal performance solid lubricant used in the refractory slates, various compositions of starch, graphite and water were evaluated by testing their viscosity, coefficient of friction and wear performance. At 15% starch content, the degree of viscosity increment rose in proportional to graphite content and the lowest coefficient of friction was observed when the graphite content was at 30 wt%. Our results demonstrate that, as the water content decrease, the ratio of solid content increases, which compromises the surface coating resulting in increase of coefficient of friction. The best wear test result was obtained when the starch content was at 15 wt% with graphite content at either 25 wt% or 30 wt%.
노승백,임미애 啓明大學校 産業技術硏究所 1995 産業技術硏究所 論文報告集 Vol.18 No.-
The control of pH is a very important process in physical, chemical and biological fields. Though the pH control can be applicable in several fields, the pH process has been known difficult to control due to its high nonlinearity. To resolve this problem, it has been actively investigated to convert a nonlinear control problem into a linear one. In this paper, linear pH control schemes were suggested from the derivation of the linearization relationship and models for a pH process were developd. Real processes were simulated using the optimum concentration and equilibrium constant obtained by the two and three parameter models. The simulation was performed using the estimated parameters by means of the PI controller. According to the simulation results, the proposed method has revealed that responses are fast with the change in the setpoint and the control performance is superior to existing control method.