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박재옥,신은호,이덕용,이은엽,이의정 이화여자대학교 의과대학 1972 梨花醫學誌 Vol.- No.5
The present studies were undertaken for 1 year to evaluate the possible occurence of seasonal changes in the BMR. The subject for metabolic rate were selected a total of 10 Korean University students aged 20∼25 years in both sexes. Their characteristics are given in table I. Measurements of basal metabolic rates made by indirect calorimetry, using a Douglas bag and Scholander's gas analyzers. The measurements was performed in the class room where the room temeprature was kept 10 to 26℃. Subject were kept bed rest for 30∼60 minutes until both pulse rate and body temperature reached a steady state. The factors of temperature and stress which influence the BMR were studied. The annual variation of BMR is summerised in Table 2. The values obtained in this study were expressed as kilocalories/hr/㎡ of body sulface, and the following results were obtained. 1. There is no seasonal changes in MBR in both sexes. 2. There is reverse correlation between BMR and urinary nitrogen.
A Mechanistic Model for Forced Convective Transition Boiling of Subcooled Water in Vertical Tubes
Lee, Kwang-Won,Baik, Se-Jun,Han, Sang-Good,Joo, Kyung-Oin,Yang, Jae-Young Korean Nuclear Society 1995 Nuclear Engineering and Technology Vol.27 No.4
A mechanistic model for forced convective transition boiling has been developed to predict transition boiling heat flux realistically. This model is based on a postulated multistage boiling process occurring during the passage time of an elongated vapor blanket specified at a critical heat flux condition. Between the departure from nucleate boiling (DNB) and the departure from film boiling (DFB) points, the boiling heat transfer is established through three boiling stages, namely, the macrolayer evaporation and dryout governed by nucleate boiling in a thin liquid film and the unstable film boiling. The total heat transfer rate during the transition boiling is the sum of the heat transfer rates after the DNB weighted by the time fractions of each stage, which are defined as the ratio of each stage duration to the vapor blanket passage time. The model predictions are compared with some available experimental transition boiling data. From these comparisons, it can be seen that the transition boiling heat fluxes including the maximum heat flux and the minimum film boiling heat flux are nil predicted at low qualities/high pressures near 10 bar.
Simultaneous removal of SO2 and NOX with ammonia absorbent in a packed column
Yong Jia,Daqian Du,Xinxi Zhang,Xilou Ding,Oin Zhong 한국화학공학회 2013 Korean Journal of Chemical Engineering Vol.30 No.9
Catalytic oxidation of NO followed by simultaneous removal of SO2 and NOX with ammonia is a promising method for control of coal-fired flue gas pollutants. We investigated simultaneous absorption of SO2 and NOX in a packed column with ammonia, and found that SO2 and NOX could promote absorption with each other in the process of simultaneous removal SO2 and NOX. The removal efficiency of SO2 and NOX was, respectively, about 98% and 70.9% at pH 5.5, temperature 323.15 K, SO2 concentration 1,800×10−6, NOX concentration 400×10−6 and mNO2/mNO 1 in our experimental system. The experimental results also show that the formation of sulfite oxidized by reacting with dissolved NO2and the molar ratio of sulfite to total sulfur is more than 0.8 in the solution. Accordingly, the energy consumption for sulfite oxidation would be greatly reduced in the process of simultaneous desulfurization and denitrification with ammonia.