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산/알칼리 촉매를 사용한 우지와 자트로파유 혼합지방의 바이오디젤화
현영진 한국유화학회 2009 한국응용과학기술학회지 Vol.26 No.2
The esterification of the reactants of Jatropha oil and methanol added by propyleneglycol was done using p-TSA catalyst. And then the emulsification of triglyceride and methanol was conduced by 1.0vol% GMS. The emulsified reactants were transesterified at 65℃ using TMAH and mixed catalyst (50wt%-TMAH+50wt%-NaOH) respectively. The esterification conversion at the 1:8 molar ratio of free fatty acid to methanol using 8.0wt% p-TSA was 94.7% within 80min. The overall conversion at the 1:8 molar ratio of mixed fat(50wt% Beef Tallow) to methanol and 65℃ using mixed catalyst was 95.4% The cloud point of Biodiesel decreased with the addition of petroleum diesel.
신용카드 이자율은 왜 높은가?:1980년 이후 미국 신용카드 시장을 대상으로
현영진 한국사회경제학회 2008 사회경제평론 Vol.- No.31
The paper tries to explain the origin of higher credit card rates in the U. S. since 1980 by using a theoretical model and supporting data. I suggest excessive credit card rates are caused by higher bargaining power of credit card banks relative to consumers and it was showed by way of an illustration of generalized Nash bargaining model. Based on the result of the model, historical movements of the rates were described considering factors which made an impact on bargaining powers by periods. 본 논문에서는 미국 신용카드 시장에서 초과 이자율이 발생한 원인을 은행의 협상력이 소비자에 비해 증가했기 때문이라는 것을, 일반화된 내쉬협상 모형을 이용하여 이론적으로 도출하고자 하였다. 이를 위해서 먼저 은행-소비자 모형을 구성하고, 이 모형을 일반화된 내쉬협상 모형과 결합하여, 협상력이 반영될 때 은행과 소비자 간에 이자율이 어떻게 결정되는지를 일반화된 내쉬협상 모형의 예를 통해 구체적으로 살펴보았다. 그 결과 이자율은 은행의 협상력이 커지면 상승하고, 소비자의 협상력이 커지면 감소하는 것으로 나타났다. 모형의 결과를 토대로, 1980년 이후 미국 신용카드 이자율의 변동을 시기별로 분석하였다.
玄榮珍 濟州大學校 새마을硏究所 1989 새마을硏究論文集 Vol.6 No.-
From the literature surveys, the conditions for the reaction rate model being necessary to predict the enhanced quantitative extent of Uranium (Ⅵ) extraction with the D₂EHPA containing the accelerator were presented as follows. 1. When the interfacial reaction resistance appeared in the aqueous phase due to the value of activation entropy change (△S^(≠)) on the Uranium(VI), it was supposed that such an auxilliary ligand as acetate ought to be added to the aqueous phase. 2. Considering the very small amount of HRad on the interface determined by the Gibb's adsorption equation, it was supposed that the accelerator ought to be added to the organic phase because of the appearance of the interfacial reaction resistance in that phase. 3. When the optimum auxilliary ligand and the optimum accelerator added to each phase were used, it was supposed that the prediction of the reaction rate according to the rate-limiting step due to the values of △S^(≠), HRad,[HR]&[(HR)₂]was reasonable.
현영진,서인수 제주대학교 해양과환경연구소 2001 해양과환경연구소 연구논문집 Vol.25 No.-
This experiment was centered on th prediction of fatty acid compositions in rapedseed oil from Canada. The its conditions were molar ratio of methanol to oil(1/10), catalyst content 0.8%(w/w) potassium hydroxide, reaction temperature 45℃. The compositions in rapedseed oil depended on the country on which it grew, the cultivating region, the soil quality, the climate and the kinds of analyizing instrument. The compositions in rapenseed oil from Canada through fatty acid methyl ester reaction were 63.1% oleic acid, 22.3% linoleic acid, 9.6% linolinic acid, 5.0% palmitic and stearic acid.
현영진 濟州大學校 産業技術硏究所 1995 산업기술연구소논문집 Vol.6 No.-
The uranium(V1) extraction in the continuous vessel was carried out with the flow rates of continuous and organic phase. The initial concentration of uranium(VI) in the external aqueous phase was 1,000 ppm. The mechanism of batch uranium(VI) extraction through the double liquid membrane mediated by DzEHPA was interpreted by the corrected Advanced Front Model. The continuous uranium(VI) extraction was analyzed by the extraction efficiency due to the above model. The times required for uranium(VI) extraction equilibria decreased with the increase of flow rates in the continuous phase under the constant flow rates in the organic emulsion phase. On the other hand, the times required for uranium(VI) extraction increased with the increase with the increase of flow rates in the organic emulsion phase under the constant flow rates in the continuous phase. Therefore the extent of uranium(VI) extraction decreased with the decrease of the times required for the uranium(VI) extraction equilibria. The main operating variable to increase the uranium(VI) extraction efficiency was proved to be the flow rates of continuous phase. The prediction of the optimum operating conditions for the increase of uranium(VI) extraction satisfied with the decrease of the times required for the uranium(VI) extraction equilibria was necessary for this experiment.
현영진 제주대학교 공과대학 첨단기술연구소 2005 尖端技術硏究所論文集 Vol.16 No.1
The alkali-catalyzed transesterification of vegetable oils into Bio-diesel using 1vol% emulsifier at 60°C was performed on the rotary viscometer. The viscosity of fatty acid methyl ester was predicted by Orrick and Erbarr' s model. The overall yield increased as the viscosity decreased. The limiting molar ratio of methanol to oil appeared to be 1:5 due to 1vol% emulsifier. The sodium hydroxide was shown to be the optimum catalyst and its content appeared to be 0.5wt%. The overall yield(%) of fatty acid methyl ester from canola oil was 95%.