http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Dilatant System의 Flow Mechanism에서 Starch-Water Suspension의 점성도에 미치는 Electrolyte의 영향
金應冽 한양대학교 교육대학원 1986 敎育論叢 Vol.3 No.-
Potato Starch-Water Suspension에 Kcl, Bacl₂, Alcl₃의 전해짐을 첨가했을 때, 각각의 농도변화와 전해질의 Valance에 따라 suspension의 점도가 어떻게 변화하는지를 Couette type Automatic rotational Viscometer를 이용하여 관찰하였다. 전해질의 양이온 원자가가 클수록, 또한 농도가 증가할수록 dilatancy가 감소하는 것으로 나타났다. Verweay-Overbeek Theory에 의하면 repulsive potential (Vr)은 전해질 농도와 Valance가 증가됨에 따라 증가하며, 이러한 Vr의 증가는 입자간의 수소결합을 약화시켜 Scaffolding Structure가 쉽게 깨어지게 하므로 계의 Viscosity가 감소하게 됨을 알았다. Starch-Water Suspension의 rheological Property에 있어서, 입자간 수소결합이 큰 영향을 미치고 있는 것을 알 수 있었다. The viscosity changes of potato starch-water suspension containing various electrolytes (with KCL, BaCL₂ and AlCl₃) concentration and valences were measured by using a Couette type automatic rotational viscometer respectively. A system, which has higher valence and larger electrolyte concentration, has smaller dilatancy phenomenon observed. According to the Verway-Overbeek Theory, the repulsive potential (Vr) increases with increasing electrolyte concentration and valence, and the increasing of Vr inhibits hydrogen bond between starch granules. These results indicate clearly that the scaffolding structure becomes more unstable and the viscosity of suspension becomes smaller. The rheological properties of starch-water suspension can be explained by hydrogen bond system.
김응렬 고려대학교 한국학연구소 2003 한국학연구 Vol.18 No.-
The purpose of this paper is to analyze change of age structure and aging problems. According to NSO(The National Statistical Office), South Korea has become ahing society. The population of the aged is increasing rapidly as a result of better living conditions and the advancement medical technology. Meanwhile, TFR(Total Fortile Rates) is decreasing rapidly as a result of change of social environment, such as women's high educational level achievement and participation in economic activities, late marriage in life and transformation of women's life style. Population Aged 65 and Over(in thousands) and TFR Selected Years. (본문참조) Compared with other developed countries, the numbers of the aged is not yet serious problem in South Korea. South Korea has a strong tradition of family support for the elderly but now this has weakened family support. The central and local government is tasked with preparing a social safety net.