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播種期 및 栽植樣式이 大豆品種의 栽植密度에 미치는 影響
安容泰 서울여자대학교 1974 서울여자대학논문집 Vol.- No.3
For the study on the effect of planting density and method under different seeding time on the yield and yield component of soybean, three different varieties wee tested under eight planting density and method combined with two different seeding times. The result obtained in this study may be summarized as follows; 1) Grain yield was generally higher in early seeding than late seeding, particulary in Kwangkyo and all varieties tested in this study showed the highest grain yield in the case of 40 plants per square meter with one plant per one hill and one raw planting. Kwangkyo showed the highest grain yield at where in case of late seeding SRF-300 was the highest in grain yield. 2) The main stem dependability of grain yield was the highest in SRF-300 and was increased by the increase of planting density. The main stem dependability of grain yield was also higher in case of zigzag planting with one plant per hill than one raw planting when planting number per unit area is same. But there was no significant difference between seeding time in the main stem dependability of grain yield. 3) Pod number per plant showed increasing tendency by the decrease of planting density, early seeding and zigzag planting 4) There was significant varietal difference in 100grain weight, but showed a little difference of 100 grain weight as the changing seeding time and planting density and method. 5) The significant varietal difference of 1l weight was observed, and SRF-300 and chungpuk paik was some what larger in 1l weight in late seeding than early seeding. There was a little difference in 1l weight by the change of planting density and method.
P<sub>2</sub>O<sub>5</sub>-SnO<sub>2</sub>계 유리에서 용융분위기에 따른 구조와 물성에 미치는 영향
안용태,최병현,지미정,권용진,배현,황해진,An, Yong-Tae,Choi, Byung-Hyun,Ji, Mi-Jung,Kwon, Yong-Jin,Bae, Hyun,Hwang, Hae-Jin 한국세라믹학회 2012 한국세라믹학회지 Vol.49 No.2
In this study, tin phosphate glass system($SnO_2-(1-x)P_2O_5-xB_2O_3$) that occur during the melting of the metal oxide inhibition of the oxidation reaction, and to reduce oxides of high melting temperature in the following three methods were melting. The first is the general way in the atmosphere, and the second by injecting $N_2$ gas under a neutral atmosphere, and finally in the air were melted by the addition of a reducing agent Melt in the atmosphere when the oxidation of the metal oxide is inhibited by low temperatures were melting. In addition, the deposition of crystals within glassy or inhibit devitrification phenomenon is also improved over 80% transmittance. This phenomenon, when the melting of glass, many of $Sn^{4+}$ ions are reduced to the $Sn^{2+}$ was forming oxides SnO, because it acts as a modifier oxide.
전사지를 이용한 다전지식 평관형 고체산화물 연료전지 제작 및 셀 특성
안용태,지미정,박선민,신상호,황해진,최병현,An, Yong-Tae,Ji, Mi-Jung,Park, Sun-Min,Shin, Sang-Ho,Hwang, Hae-Jin,Choi, Byung-Hyun 한국재료학회 2013 한국재료학회지 Vol.23 No.3
In the segmented-in-series solid-oxide fuel cells (SIS-SOFCs), fabrication techniques which use decalcomania paper have many advantages, i.e., an increased active area of the electrode; better interfacial adhesion property between the anode, electrolyte and cathode; and improved layer thickness uniformity. In this work, a cell-stack was fabricated on porous ceramic flattened tube supports using decalcomania paper, which consists of an anode, electrolyte, and a cathode. The anode layer was $40{\mu}m$ thick, and was porous. The electrolyte layers exhibited a uniform thickness of about $20{\mu}m$ with a dense structure. Interfacial adhesion was improved due to the dense structure. The cathode layers was $30{\mu}m$ thick with porous structure, good adhesion to the electrolyte. The ohmic resistance levels at 800, 750 and $700^{\circ}C$ were measured, showing values of 1.49, 1.58 and $1.65{\Omega}{\cdot}cm^2$, respectively. The polarization resistances at 800, 750 and $700^{\circ}C$ were measured to be 1.63, 2.61 and $4.17cm^2$, respectively. These lower resistance values originated from the excellent interfacial adhesion between the anode, electrolyte and cathode. In a two-cell-stack SOFC, open-circuit voltages(OCVs) of 1.915, 1.942 and 1.957 V and maximum power densities(MPD) of 289.9, 276.1 and $220.4mW/cm^2$ were measured at 800, 750 and $700^{\circ}C$, respectively. The proposed fabrication technique using decalcomania paper was shown to be feasible for the easy fabrication of segmented-in-series flattened tube SOFCs.
안용태,조세연,송영채,이원태,정재우 대한토목학회 2017 KSCE JOURNAL OF CIVIL ENGINEERING Vol.21 No.3
Reticulated Vitreous Carbons (RVCs) doped with low-cost catalysts, such as PANI (polyaniline), PANI+FePc (iron(II) phthalocyanine) and PANI+CuPc (copper phthalocyanine), were used as the cathodes in air-cathode microbial fuel cells (MFCs). Cyclic Voltammograms (CV) showed that the electrochemical activity was considerably enhanced by doping the catalysts on the plain RVC material. The greatest enhancement of the electrochemical activity was obtained with PANI+FePc, followed by PANI+CuPc and then PANI alone. Total internal resistance of the MFC with RVC cathode doped with PANI+FePc was the lowest at 136 Ω, followed by the RVC coated with PANI+CuPc (211 Ω) and then PANI (739 Ω). The maximum power density of 91.29 mW/m2 was obtained with the RVC cathode coated with PANI+FePc. The COD removal and coulombic efficiencies were also affected by the cathode material. The highest COD removal and coulombic efficiencies of 98 and 15%, respectively, were obtained using the RVC coated with PANI+FePc as the cathode material. In conclusion, the RVC coated with PANI+FePc was found to be the best alternative cathode material tested in these experiments.
전사지를 이용 적층한 셀 구조 및 연료극 기능층 형성에 따른 출력 특성
안용태,지미정,구자빈,최진훈,황해진,최병현,An, Yong-Tae,Ji, Mi-Jung,Gu, Ja-Bin,Choi, Jin-Hoon,Hwang, Hae-Jin,Choi, Byung-Hyun 한국재료학회 2012 한국재료학회지 Vol.22 No.11
The properties of SOFC unit cells manufactured using the decalcomania method were investigated. SOFC unit cell manufacturing using the decalcomania method is a very simple process. In order to minimize the ohmic loss of flattened tube type anode supports of solid oxide fuel cells(SOFC), the cells were fabricated by producing an anode function layer, YSZ electrolyte, LSM electrode, etc., on the supports and laminating them. The influence of these materials on the power output characteristics was studied when laminating the components and laminating the anode function layer between the anode and the electrolyte to improve the output characteristics. Regarding the performance of the SOFC unit cell, the output was 246 $mW/cm^2$ at a temperature of $800^{\circ}C$ in the case of not laminating the anode function layer; however, this value was improved by a factor of two to 574 $mW/cm^2$ due to the decrease of the ohmic resistance and polarization resistance of the cell in the case of laminating the anode function layer. The outputs appeared to be as high as 574 and 246 $mW/cm^2$ at a temperature of $800^{\circ}C$ in the case of using decalcomania paper when laminating the electrolyte layer using the in dip-coating method; however, the reason for this is that interfacial adhesion was improved due to the dense structure, which leads to a thin thickness of the electrolyte layer.