Sung Man Seo

Synthesis and Characterization of Selenium-sorbed Ca 2+ -exchanged Zeolite A for High-performance Feed

This study was carried out to develop high-performance feed using selenium-sorbed Ca 2+ -exchanged zeolite A. The contents of Se increased with increasing reaction temperature and the content of Ca 2+ ions in Ca 2+ -exchanged zeolite A. A synthesized high-performance feed (0.306 ppm) was applied to poultry farming for 4 and 7 weeks, respectively. Se contents in chicken meats and eggs were 18.8, 27.2, and 94.1 ppb and 73.7, 14.9, and 64.5 ppb for control (retail chicken meats), 4, and 7 weeks, respectively; Ca contents were 3.8, 9.9, and 11.9 ppm and 48.6, 48.3, and 53.6 ppm, respectively. In conclusion, Se and Ca contents in chicken meats increased as feeding periods increased, but significant differences were not observed in the eggs.

Chromaticity (b*) and Transmittance of ITO Thin Films Deposited on PET Substrate by Using Roll-to-Roll Sputter System

Indium Tin Oxide (ITO) thin films on Polyethylene Terephtalate (PET) substrate were prepared by Roll-to-Roll sputter system with targets of 5 wt% and 10 wt% SnO2 at room temperature. The influence of the chromaticity (b*) and transmittance properties of the ITO Films were investigated. The ITO thin films were deposited as a function of the DC power, rolling speed, and Ar/O2 gas flow ratio, and then characterized by spectrophotometer. Their crystallinity and surface resistance were also analyzed by X-ray diffractometer and 4-point probe. As a result, the chromaticity (b*) and transmittance of the ITO films were broadly dependent on the thickness, which was controlled by the rolling speed. When the ITO films were prepared with the DC power of 300 W and the Ar/O2 gas flow ratio of 30/1 sccm using 10 wt% SnO2 target as a function of the rolling speeds 0.01 through 0.10 m/min, its chromaticity (b*) and transmittance were about -4.01 to 11.28 and 75.76 to 86.60%, respectively. In addition, when the ITO films were deposited with the DC power of 400W and the Ar/O2 gas flow ratio of 30/2 sccm used in 5 wt% SnO2 target, its chromaticity (b*) and transmittance were about -2.98 to 14.22 and 74.29 to 88.52%, respectively.

Co기 초합금 ECY768에서 응고 조직 및 탄화물 형성 거동

【Directional solidification experiments were carried out at 0.5-150

Mn(2+)-Ion Site Distribution of Zeolite Y (FAU, Si/Al = 1.56) Depending on the Ion-Exchange Ratio.

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Partially Dehydrated Fully Zn 2+ -exchanged Zeolite Y (FAU, Si/Al = 1.70) and Its Structure

/s in the Co-base superalloy ECY 768. As increasing solidification rate, the dendrite length increased and it reached the maximum at 150

Single-crystal structures of highly NH4+-exchanged, fully deaminated, and fully Tl+-exchanged zeolite Y (FAU, Si/Al=1.56), all fully dehydrated

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Six Single-Crystal Structures Showing the Dehydration, Deamination, Dealumination, and Decomposition of NH4+-Exchanged Zeolite Y (FAU) with Increasing Evacuation Temperature. Identification of a Lewis Acid Site

/s, where the tip temperature is close to the liquidus. The liquidus and eutectic temperatures could be estimated by comparing the dendrite lengths and the temperature gradients at the solid/liquid interface and those were estimated as

Crystallographic Verification that Copper(II) Coordinates to Four of the Oxygen Atoms of Zeolite 6-Rings. Two Single-Crystal Structures of Fully Dehydrated, Largely Cu2+-Exchanged Zeolite Y (FAU, Si/Al = 1.56)

1424.6^{\circ}C

Single-Crystal Structures of Fully and Partially Dehydrated Zeolite Y (FAU, Si/Al = 1.56) Ni2+ Exchanged at a Low pH, 4.9

and

Single-crystal structures of fully and partially dehydrated zeolite Y (FAU, Si/Al = 1.56) largely Co2+ exchanged at pH 5.1

1343^{\circ}C