Showing papers by "University of Minho published in 1981"
TL;DR: In this paper, a mathematical model of the drop breakage process is applied to countercurrent flow liquid-liquid extraction columns and the resulting drop population balance equations have been solved to predict rates of drop breakages and ensuing local drop size distribution changes with height.
31 citations
TL;DR: In this article, the influence of feed composition on the actual degrees of separation attained at the top and bottom sections of a thermogravitational column is discussed using the classical phenomenological theory of Furry, Jones, and Onsager.
Abstract: The influence of the feed composition upon the actual degrees of separation attained at the top and bottom sections of a thermogravitational column is discussed using the classical phenomenological theory of Furry, Jones, and Onsager. It is shown that, except for a feed composition of C 0 = 0.5 (mass fraction), the separation profile is nonsymmetric, i.e., the separations in the top and bottom sections of the column are nonsymmetric with respect to the feed composition, the asymmetry increasing as the feed composition moves away from C 0 = 0.5. An equation for the determination of the optimum feed location as a function of the feed composition is derived.
2 citations
01 Jan 1981
TL;DR: For example, this article argued that if children test these limits and find themselves unimpressed by them, then the teacher's bluff is called and there is little further that can be done.
Abstract: Of all the professional anxieties that assail the teacher, those associated with class control often loom the largest. Children, singly or in groups, can present problems that even the most experienced teacher may find hard to handle, and there is no denying the misgivings that working with children, control of whom is slipping away from one, can bring. To make matters worse, many teachers suggest that in the final analysis all the teacher’s authority is based upon a kind of bluff. There are strict limits to the sanctions that can be brought to bear upon children, and if children test these limits and find themselves unimpressed by them, then the teacher’s bluff is called and there is little further that can be done.