, t N, R. , , , , . R , , .
(7.60)
(7.61)
N0- . , , , R ; R>1, . - . , . , , , . , , - .
, (7.60) , .
(, , , ) - , . , , , .
. 7.37.
. 7.37 . , , , R . , (7.60) . :
, , , , . , , . , . 7.37,
(7.62)
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. , . , R (7.60) , . , Nt. . , . 7.38 ( ; ).
. 7.38. (7.62) R = 2, = 200, N0 = 20
(7.62) , . , . 7,37, , . , , . 7.38. :
(7.63)
(7.62) b, .
a, b, R . (7.63) . , , .
. 7.39, , , , , , (7.63) b R.
. 7.39, . b =1,4, R =2
. 7.39, . b =3,9, R =2
, (7.63), (b, R) , , , () , . 7.40 N0 , b, R. , b, R . , , ,
. 7.39, . b = 3,6, R = 4
. 7.39, . b = 4,4, R = 4
, - . , .
(7.62), (7.63) , . , , . ( , ) . , . 7.39, ( ).
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. 7.40.
, . , ; , , . . . , .
= r
r , .. . , , , r > 0 , .. .
. , (. . 7.37).
. 7.41. , r, ( ). N K ( ), ( ).
,
(7.65)
. 7.41.
. - . :
(7.66)
, . , , . , , , .
(7.65)-(7.66) . 7.42.
. 7.42. No =25, = 200, r = 3