r = ρl/S.
, I :
r = P / I2
, r~ : r~ > r
r~ r . , . , , .
, , , -.
, , ( ), , , .
(. 1) , .
, ρl/S .
. 1. .
(. 1). , , , , , , .
l, , , .
d, γ, μ f.
r~ . , ro ξ (), , ξ . 2, ξ d √γμμf.
. 2. .
d , γ 1/-, μ / f = .
. d= 11,3 (S = 100 2) f = 150 .
d√γμf.
. 2 ξ = 1,03
- . .
, , , , , , , . , , , , , .
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