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

- . .

, , , , , , , . , , , , , .


( 20 )

, " " - , . , , .
, , . , " " " ", , . FAQ .


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