ator . ▁The ▁air ▁cur tain ▁acts ▁as ▁a ▁lid ▁on ▁the ▁process , ▁and ▁forces ▁the ▁smoke ▁back ▁into ▁the ▁fuel ▁bed ▁for ▁a ▁cleaner ▁burn . ▁ ▁Dis adv antages ▁Like ▁all ▁active ▁systems ▁of ▁any ▁type , ▁a ▁mechanical ▁failure ▁can ▁result ▁in ▁total ▁failure ▁of ▁protection . ▁ ▁External ▁links ▁ ▁Development ▁of ▁an ▁air ▁b ubble ▁cur tain ▁to ▁reduce ▁under water ▁noise ▁of ▁per cuss ive ▁p iling ▁ ▁Marine ▁Environment al ▁Research ▁ 4 9 ( 2 0 0 0 ) 7 9 - 9 3 , ▁Else vier ▁ ▁Retrieved ▁ 2 / 1 6 / 2 0 1 7 ▁▁▁ ▁B ubble ▁Cur tain s : ▁Can ▁They ▁D amp en ▁Off sh ore ▁Energy ▁Sound ▁for ▁Wh ales ? ▁ ▁National ▁Geographic ▁ ▁Retrieved ▁ 2 / 1 6 / 2 0 1 7 ▁ ▁You ▁T ube : ▁How ▁an ▁Air ▁Cur tain ▁Works ▁ ▁by ▁Bern er ▁International ▁ ▁Retrieved ▁ 2 / 1 6 / 2 0 1 7 ▁ ▁Category : Fl uid ▁dynamics ▁Category : P oll ution <0x0A> </s> ▁May town ▁is ▁an ▁un in cor por ated ▁community ▁ ▁located ▁in ▁south ▁Vol us ia ▁County , ▁Florida , ▁United ▁States . ▁ ▁References ▁ ▁Category : Un in cor por ated ▁communities ▁in ▁Vol us ia ▁County , ▁Florida ▁Category : Un in cor por ated ▁communities ▁in ▁Florida <0x0A> </s> ▁Select ivity ▁is ▁a ▁measure ▁of ▁the ▁performance ▁of ▁a ▁radio ▁receiver ▁to ▁respond