Sp 2nyMT .
Ke't hQpvoi (1.52), ta duQc
fgzds = 2nyMT,
Sp
(1.54 )
voi Sp bay giGIa loan bQffi~tph~ng n~ffingang.
Do do, thanh ph§n th~ng dung cua tru'ong hffp d~n Iffydch phan tren loan bQ m~t ph~ng la ty 1<%vOiloan bQkh6i luQng n~ffiduoi ffi~t ph~ng do. Mi~n sao loan
bQ kh6i luQng do phai duQc bao quanh bdi ffiQt ffi~t kin. Tit do, (1.54) cho ta ffiQt each d~ tinh t6ng kh6i vuQt giOi h~n cua ffiQt phep do d9 di thuong cua 11;1'chffp
d~n ne'u chung ta co th~ co I~p duQctruong cua ngu6n hffp d~n di thuong do khoi tfft ca cac ngu6n gay nen truong hffp d~n khac. Khong co gia thuye't nao duQcd~t fa cho hlnh d~ng cua ngu6n cling nhu s1;1'phan ph6i ffi~td9 cua ngu6n do.
J21lijl'l milL /lt1!e Xl] 38 g r4n 'jfJO-iJi {J{J,mL
nhuQc di€m hC;tnche' trong cac ling dl;lng. Cac nghien cUu v€ truong hc1p d§n khong baa giO xay ra tren to~m bQ mi€n m~t ph~ng vo hC;tn.Bi€u ma ta c6 th€ chc1p nh~n Ia ta c6 th€ tht;tc hi~n vi~c do dC;tctren mQt mi€n du IOn bell ngoai mi€n chlia ngu6n din khao sat ma thai. Trong tht;tc te', chung ta khong th€ co l~p
duQc cac ngu6n gay nen truong hc1pd§n, va rc1tkh6 d€ tach truong,hc1p d§n di thuong gay ra boi cac v~t th€ c~n quail tam khoi cac truong hc1pd§n gay ra boi cac mi€n ngu6n khac.
1.2.5. Lop tu'o'ng du'o'ngGreen
Xet Se la mQt m~t d~ng the' d6ng nh~n duQc tu mQt phan b6 kh6i luQng vdi m~t dQ p, va R la mi€n gidi hC;tnboi Se va xet the' hc1pd§n thu duQc tC;tidi€m P
n~m ngoai Se. Cong thlic Green thli hai cho