This paper presents a new algorithm for the calculation of stream surfaces for tetrahedral grids. It propagates the surface through the tetrahedra, one at a time, calculating the intersections with the tetrahedral faces. The method allows us to incorporate topological information from the cells, e.g., critical points. The calculations are based on barycentric coordinates, since this simplifies theory and algorithm. The stream surfaces are ruled surfaces inside each cell, and their construction is started with line segments on the faces. Our method supports the analysis of velocity fields resulting from computational fluid dynamics (CFD) simulations.

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n i v e r s i t y of A l e x a n d r i a , Alexandria 21 521, Egypt ABSTRACT Three simple and s e n s i t i v e s p e c t r o p h o t o n e t r i c methods f o r t h e d e t e r m i n a t i o n of arninoglutethimide a r e described. The f i r s t method i s based on t h e d i a z o t i z a t i o n of t h e drug and t h e r e a c t i o n product i s q u a n t i f i e d spectrophotom e t r i c a l l y a t 273 nm. The second and t h i r d methods involve coupling o f t h e d i a z o t i z e d s a l t of t h e drug w i t h e i t h e r e t h y l a c e t o a c e t a t e (EAA) i n a l k a l i n e medium o r B-(I-napnt h y l ) ethylenediamine hydrochloride ( m D ) i n a c i d medium, t o g i v e c o l o r e d r e a c t i o n p r o d u c t s measurable a t 368 nrn and 1109 u l l y t o t h e d e t e r m i n a t i o n o f aminog l u t e t h i m i d e i n t a b l e t s w i t h good accuracy and p r e c i s i o n . The r e l i a b i l i t y of t h e developed methods were e s t a b l i s h e d by comparing t h e o b t a i n e d r e s u l t s w i t h t h o s e g i v e n by t h e o f f i c i a l United S t a t e s Pharmacopeial XXII methods. INTRODUCTIOIi

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