ione er ▁in ▁Under water ▁Ac oust ics ▁Medal ▁by ▁the ▁Ac oust ical ▁Society ▁of ▁America , ▁" for ▁application ▁of ▁the ▁par abol ic ▁equation ▁to ▁under water ▁ac oust ic ▁propag ation ." ▁▁▁ ▁The ▁ 1 4 5 th ▁Ann ual ▁Me eting ▁of ▁the ▁Ac oust ical ▁Society , ▁in ▁ 2 0 0 3 , ▁featured ▁a ▁mem orial ▁session ▁dedicated ▁to ▁Frederick ▁T app ert ▁on ▁the ▁subject ▁of ▁" Pro pag ation ▁Ph en omena ▁and ▁the ▁Par abol ic ▁Equ ation ." ▁ ▁References ▁ ▁External ▁links ▁ ▁Techn ical ▁Report ▁on ▁U MP E : ▁The ▁University ▁of ▁Miami ▁Par abol ic ▁Equ ation ▁Model , ▁Version ▁ 1 . 0 . ▁( 1 9 9 3 ) ▁ ▁" The ▁Energy - Con ser ving ▁Property ▁of ▁the ▁Standard ▁P E ", ▁D ing ▁Lee ▁and ▁Er - Sh ang ▁Ch ang . ▁This ▁article ▁was ▁dedicated ▁to ▁Frederick ▁T app ert ▁and ▁includes ▁bi ographical ▁information . ▁ ▁Category : 2 0 th - century ▁American ▁phys ic ists ▁Category : 1 9 4 0 ▁birth s ▁Category : 2 0 0 2 ▁death s ▁Category : Pe ople ▁from ▁Cor al ▁G ables , ▁Florida ▁Category : Pr inc eton ▁University ▁al umn i <0x0A> </s> ▁Ch hib ber ▁( P un j abi ▁ <0xE0> <0xA8> <0x9B> ਿ <0xE0> <0xA9> <0xB1> <0xE0> <0xA8> <0xAC> ਰ , ▁H indi ▁ <0xE0> <0xA4> <0x9B> ि ब ् ब र ) ▁altern