, . , F. ( ) S
, (1.4)
h - , .
, b, a (.3)
.
- .
, , (.5,)
F . D, F, . (1.1) , D , (.4). zd
(1.5)
zC - ;
IC - , , 4.
, , IC = bz 3/12, S=bz, zC = z /2. (1.5) zD =2/3 z, D 2/3 z 2/3 .
, - , . .5, , ( , ..) . , p = gh, 0 gH. .5, . F NMOB. , . F .