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THÈSE Nicolas VASSET

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R 3 <br />

<br />

<br />

<br />

<br />

<br />

(ξ, θ ′<br />

, ϕ ′<br />

) <br />

θ = θ ′<br />

ϕ = ϕ ′<br />

ξ <br />

0 ≤ r ≤ r0 <br />

r = α0ξ, ξ ∈ [0, 1], , α0 = r0. <br />

(1 ≤ j ≤ n) r ∈ [rj−1, rj] <br />

r = αjξ + βj, ξ ∈ [−1, 1], αj = rj − rj−1<br />

2<br />

βj = rj + rj−1<br />

. <br />

2<br />

rn ≤ r ≤ ∞ <br />

u = 1/r <br />

u = 1<br />

r = αn+1(1 − ξ), ξ ∈ [−1, 1], αn+1 = 1<br />

2rn<br />

.

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