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background: while in the open air the amount of radon gas is very small and does not pose a health risk, in confined spaces, radon can accumulate to relatively high levels and become a health hazard. exposure to high levels of radon has been associated with an increased risk of lung cancer, depending on the time length of exposure. radon level in dwelling of shiraz with 1,200,000 populations ha...

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Humans can r e c o v e r t h e shape o f a s u r f a c e f r o m i t s image b o u n d a r y . The a u t h o r s have p r e s e n t e d a new a p p r o a c h t o shape f r o m b o u n d a r y [ 4 ] . I t i n c l u d e s t h r e e p o i n t s : t h e l i n e o f c u r v a t u r e (LOC) r e g u l a r i t y , a n a l g o r i t h m f o r c o n s t r u c t i n g LOC net f r o m b o u n d a r y , and...

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