In this talk, we introduce that generic topological structures of global stream-line patterns generated by the complex velocity potentials of uniform flows and pointvortices are uniquely represented by labelled trees. Moreover, we show that topologicalstructures of generic surface flows can be represented by finite combinational structures.Finally, we discuss the relations betwe...

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long exposure of uv radiation increases risk of skin diseases such as cancer and photoallergic reactions. uv-b (280-320 nm) radiation is mainly responsible for inducing skin problems. skin protection is a suitable method in the fight against ultraviolet radiation induced damage. various synthetic agents have been used as photo protective but because of their potential toxicity in humans, they h...