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김준태,박유라,조현실,부성민 한국육수학회 1996 생태와 환경 Vol.29 No.3
The phytoplankton community of Kumgang river was investigated at the three stations from May to September, 1994. A total of 321 species was identified, which was classified into 131 genera, 20 orders, 8 classes. Green and euglenoid algae showed a maximum number of species at the Napo station in September, but there were no significant changes in different locations in the species number of blue green algae. The number of diatom species decreased from May to September at each station. Standing crop was low with 15.9×10^4individuals/ℓ in August, but high with 37.8×10^4 individuals/ℓ in September. Merismopedia spp., Oscillatoria spp., Microcystis aeruginosa and Cyclotella meneghiniana predominated in Kumgang River.
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침전법으로 제조한 Al2O3-ZrO2-Y2O3계 분말의 특성
김준태,홍기곤,이홍림 한국세라믹학회 1988 한국세라믹학회지 Vol.25 No.2
The properties of the powders of the system Al2O3-ZrO2-Y2O3 prepared by precipitation method were investigated. Al2(SO4)3$.$18H2O3, ZrOCl2$.$8H2O and YCl3$.$6H2O were used as starting materials. Amorphous aluminum hydrate prepared by precipitation method was completely transformed to alpha Al2O3 as a result of calcining at 1100$^{\circ}C$ for 1 hr and gamma, delta and theta phases appeared as transition phases. In ZrO2-Y2O3 system prepared by co-precipitation method, the crystallization temperature of ZrO2 was increase with Y2O3 contents. The coupled crystallization occured in coprecipitated Al2O3-ZrO2-Y2O3 system, therefore the formation temperature of alpha Al2O3 and ZrO2-Y2O3 system. In this ternary system, the powder morphology showed a particular shape which was composed of large Al2O3 grains having small spherical ZrO2 particles within large Al2O3 grain and relatively large ZrO2 particles along the grian boundaries.
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