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曺鍾澤,裵泰雄,韓熙世,河祥永,文炳周,金正基,孫賢秀 동아대학교 환경문제연구소 1978 硏究報告 Vol.2 No.1
Absorption of sulfur dioxide by rice plant of 10 varieties and its relation to the varietal resistance and nutrient contents of leaves in accordance with the increased sulfur contents were studied on rice plants in Ulsan district suffered from smoke injury as compared with those in Jinju district being not suffered. 1. The typical symptoms of SO₂ gas injury showing the smoky spots were presented on suffered leaves of rice plant in Ulsan district, however no symptoms were appeared in Jinju. 2. Soluble sulfur contents of leaves in affected rice plant in Ulsan were generally high, presenting the amount of 0.176%. 3. Average nitrogen content of suffered leaves in Ulsan was 1.68%, and showed statistically high correlation with soluble sulfur content. The correlation coefficient(r) was +0.557. 4. Negative correlation were revealed between S and Ca, K and P contents of leaves, having the coefficient of -0.354, -0.378, -0.27 respectively, and no significant correlation was found. 5. Mn, Mg and SiO₂ contents of leaves were showed no connection with S content of leaves. 6. The ratio of SiO₂/N and K₂O/N of leaves were highly correlated with S content having the coefficient of -0.535, -0.512 respectively. The ratio of K₂O/SiO₂ and CaO/MgO were not significantly correlated with S content. 7. Of the rice yield components, weight of unpolished rice per 10a, weight of unhulled rice 「per 10a, mating ratio, number of grain per panicle, 「panicle length and clum length of affected rice plant in Ulsan district were remarkedly reduced as compared with healthy rice plant in Jinju. 8. Weight of unpolished rice, number of grain per panicle and number of panicle, of the yield components for suffered rice plant in Ulsan district were revealed high amount in "Nopoong" variety and in "Milyang 23", the next.
Y. BAI,L. Y. FAN,X. Z. MA,H. L. PENG,E. Z. SONG 한국자동차공학회 2016 International journal of automotive technology Vol.17 No.4
−In this paper, the bond graph model of common rail injector was proposed in consideration of the effects of variable liquid capacitance and fuel physical property on the injection characteristics of the injector. State equations were derived based on the model, which were numerically solved by programming in Matlab. Comparisons between the simulation results and the experimental data show that the numerical model can effectively predict the injection quantity of the system. Effect of variation of delivery chamber diameter, needle seat semi-angle, needle cone semi-angle, ball valve seat semi-angle, nozzle hole diameter, inlet orifice diameter and outlet orifice diameter on fuel injection quantity had been analyzed. The influence rules of various parameters on the fuel injection quantity had been established. The experiments were conducted using face centered central composite design. A second order polynomial response surface model had been developed for predicting fuel injection quantity, as a function of the independent variables. Analysis of variation was used to determine the significance interactions which primarily affect the fuel injection quantity. It had been concluded that six interaction factors including delivery chamber diameter with nozzle hole diameter, needle seat semi-angle with needle cone semi-angle, needle seat semi-angle with nozzle hole diameter, needle cone semi-angle with nozzle hole diameter, nozzle hole diameter with inlet orifice diameter, and nozzle hole diameter with outlet orifice diameter have significant effect on the fuel injection quantity of the system.
Electrophoretic deposition of carbon nanotubes-hydroxyapatite nanocomposites on titanium substrate
Bai, Y.,Neupane, M.P.,Park, I.S.,Lee, M.H.,Bae, T.S.,Watari, F.,Uo, M. Elsevier 2010 Materials Science and Engineering C Vol.30 No.7
Carbon nanotubes-hydroxyapatite (CNTs-HA) composites were synthesized, using an in situ chemical method and characterized by X-ray diffraction (XRD) and transmission electron microscopy (TEM). HA particles were uniformly absorbed on the CNTs, with strong interfacial bonding. The CNTs-HA composites behaved like single composites when deposited on a titanium substrate by electrophoretic deposition (EPD). EPD was carried out at 10, 20 and 40V, for 0.5 to 8min at each voltage. Coating efficiency and weight increased with increasing deposition time, while the slope of the curves decreased, indicating a decrease in deposition rate. The CNTs-HA coating morphology was analyzed with scanning electron microscopy (SEM). The results revealed that decreasing the voltage used for deposition coatings could reduce cracking frequency. Potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) studies showed that the deposition coatings protected the titanium substrate from corroding in simulated body fluid (SBF). In addition, in vitro cellular responses to the CNTs-HA coatings were assessed to investigate the proliferation and morphology of osteoblast cell line.
Bai, Y.,Kim, K.A.,Park, I.S.,Lee, S.J.,Bae, T.S.,Lee, M.H. Elsevier 2011 Materials science and engineering B. Advanced Func Vol.176 No.15
In situ composite coating of hydroxyapatite (HA)/TiO<SUB>2</SUB> were produced on titanium (Ti) substrate by micro-arc oxidation coupled with electrophoretic deposition (MAO&EPD) technique with different concentrations of HA particles in the 0.2M NaOH electrolyte solution. The surface morphology and chemical composition of the hybrid coating were effected by HA concentration. The amount of HA particles incorporated into coating layer increased with increasing HA concentration used in the electrolyte solution. The corrosion behavior of the coating layer in simulated body fluids (SBF) was evaluated using a potentiodynamic polarization test. The corrosion resistance of the coated sample was increased compared to the untreated Ti sample. The in vitro bioactivity assessment showed that the MAO&EPD treated Ti substrate possessed higher apatite-forming ability than the untreated Ti. Moreover, the apatite-forming ability had a positive correlation with HA concentration. In addition, the cell behavior was also examined using cell proliferation assay and alkaline phosphatase ability. The coating formed at HA concentration of 5g/L exhibited the highest cell ability.
Radiative decay of theψ(2S)into two pseudoscalar mesons
Bai, J. Z.,Ban, Y.,Bian, J. G.,Blum, I.,Chen, A. D.,Chen, G. P.,Chen, H. F.,Chen, H. S.,Chen, J.,Chen, J. C.,Chen, X. D.,Chen, Y.,Chen, Y. B.,Cheng, B. S.,Choi, J. B.,Cui, X. Z.,Ding, H. L.,Dong, L. Y American Physical Society 2003 Physical review. D, Particles and fields Vol.67 No.3
Bai, Y.,Park, I.S.,Lee, S.J.,Bae, T.S.,Watari, F.,Uo, M.,Lee, M.H. Pergamon Press ; Elsevier Science Ltd 2011 Carbon Vol.49 No.11
The dispersing power of different surfactant-modified multiwalled carbon nanotubes (MWCNTs) and their effect on the antibacterial activity were examined. Three surfactants, including hexadecyltrimethylammonium bromide (CTAB), triton X-100 (TX-100) and sodium dodecyl sulfate (SDS) were tested. UV-vis absorbance, transmission electron microscopy and Fourier transform infrared spectroscopy were used to characterize the dispersion of MWCNTs in the aqueous phase, showing that the surfactant molecules had been adsorbed onto the MWCNTs' surface. Among the three surfactants, TX-100 and CTAB provided maximum and minimum dispersion, respectively. The surfactant-modified MWCNTs exhibited different antibacterial activities to Streptococcus mutans. The fluorescence images showed that the surfactant-modified MWCNTs were not only capable of capturing bacteria and forming cell aggregates, but also killing them. Under the same concentration and treatment time, the CTAB-modified MWCNTs exhibited the strongest antibacterial activity compared to the TX-100 and SDS-modified MWCNTs. The optical density growth curves and viable cell number determined by the plating method suggested that the antibacterial activity of all surfactant-modified MWCNTs was both concentration- and treatment time-dependent.