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오두환,안호경,길훈배,유해의 한국농화학회 1990 Applied Biological Chemistry (Appl Biol Chem) Vol.33 No.4
The physical and chemical properties of dry atom starch(DS), defatted acorn starch (DFS) and reincorporated acorn starch(RIS) were investigated. Swelling power and solubility of all starch sample; were exhibited two stage-behavior. It had a little change on the pasting temperature of DS and DFS but the peals viscosity and breakdown value of DFS was somewhat higher than those of DS and RIS. Flow behavior of gelatinized starch pastes showed a pseudoplastic behavior and flow behavior index was lower than unit. The consistency coefficient showed concentration and temperature dependency. The activation energies of DIS, DFS and RIS were from 1.70K㎈/g·㏖ to 3.75K㎈/g·㏖.
오두환,안호경,최형택,김병용 한국농화학회 1990 Applied Biological Chemistry (Appl Biol Chem) Vol.33 No.4
The physical and chemical properties of dry acorn starch(DS), detannined acorn starch (DTS) and defatted and detannined acorn starch(DFTS) were investigated. All acorn starch sample, observed by a scanning electron microscope, showed a hemispherical shape and its size was about 5∼10μm in diameter. It had a little change on the pasting temperature of DS, DTS and DFTS but peak viscosity of DTS was somewhat, higher than that of DS. Flow behavior of gelatinized starch pastes showed a pseudoplastic behavior and flow behavior index was lower than unit. The consistency coefficient. showed concentration and temperature dependency. The activation energies of DS, DTS and DFTS were 2.09K㎈/g·㏖∼3.58K㎈/g·㏖ and time dependent characteristic of acorn starch samples showed thixotropic behavior.
김형일,김종렬,안호경,장명익,설효정,김교한 대한치과기재학회 1997 대한치과재료학회지 Vol.24 No.2
The age-hardening behavior of a commercial dental casting low-carat gold alloy was investigated by means of differential thermal analysis, hardness test, optical microscopic observation and X-ray diffraction study. The following results were obtained. 1. By the isothermal aging of this alloy at 300∼400℃, the hardness increased markedly at the initial stage and continued to increased gradually for the time, and then decreased dractically after longer aging time. 2. The hardening was attributed to the formation of the metastable AuCu I' ordered phase from the α matrix. 3. The overaging with softening was attributed to the precipitation of the fine lamellar structure which was composed of the Ag-rich α1 and AuCu I ordered phases.