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S t = t0 <br />
<br />
<br />
<br />
<br />
<br />
t = t0 <br />
<br />
<br />
<br />
<br />
<br />
<br />
S θ (l)<br />
0 (θ, ϕ) <br />
<br />
θ (l)<br />
∞ = 0 <br />
<br />
1 ∂θ<br />
N<br />
(l) (t)<br />
∂t = µθ∆θϕθ (l) (t) − αθθ (l) (t). <br />
<br />
ψ <br />
<br />
4˜s i ˜ Diψ + ˜ Di˜s i + ψ −2 Kij˜s i ˜s j − ψ 2 K = θ (l) (t)ψ 2 , <br />
<br />
ψ <br />
<br />
<br />
<br />
ψ ψ<br />
<br />
<br />
<br />
<br />
<br />
∂ψ<br />
∂t = βi ˜ Diψ + ψ<br />
6 ( ˜ Diβ i − NK), <br />
<br />
<br />
β i