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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
21

Effect of the presence of a dispersed phase (solid particles, gas bubbles) on the viscosity of slag

Albertsson, Galina January 2009 (has links)
The viscosities of a set of silicone oils containing different size ranges of charcoal or paraffin particles as well as the viscosities of silicone oil foams were measured at room temperature in order to determine the effect of dispersed phase on the viscosity of a liquid and its effect on foaming ability. The effective viscosity of the samples increased with volume fraction of the second phase. The foaming ability was improved by the presence of the particles. The improved foaming effect was for the most part not a result of the increased viscosity. No connection between the particle size and the effective viscosity could be determined. On the other hand particle morphology and the particle size distribution had effect on the effective viscosity. The viscosity data were compared with a number of existing equations for the estimation of effective viscosity. Einstein-Roscoe equation is suitable for two-phase mixtures containing globular particles with narrow particle size distribution and low interfacial tension. New mathematical models are required for effective viscosity prediction, where the suspending phase viscosity, effect of the interfacial tension, as well as the particle morphology should be taken in consideration.
22

經濟危機:以越南市場為例

梁碧霞 Unknown Date (has links)
當經濟體在發展時,會因為經濟體與經濟體之間資本分配的失衡,或是資本配置的重心不同而引發不同的經濟危機產生,使得經濟體的運作失去效率。而經濟危機發生的成因很多,本研究針對以戰爭、全球工業化以及資本家投資等為主要的討論方向,造成匯率、利率以及金融體系的問題,造成經濟體物價高漲,投資降低,產出下降,最後會使得經濟體陷入成長的停滯或是衰退。本研究以2008年越南的高通膨為研究的對象,探討此次越南的經濟危機,將會對正在成長的新興市場造成什麼樣的衝擊。並提供提出一個可供參考的準則,讓未來希望投資於成長型的新興市場,一個評估的模式及依據。

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