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µÚÒ»¾ä£ºWhere a particle size distribution is conducted on the cuttings the use of a theoretical, spherical diffusion model (Crank, 1 975) may be considered for analyses¡£
µÚ¶þ¾ä£ºThis is solved for the diffusion coefficient using the summation of desorbed volume for the various cuttings size components to yield a diffusion coefficient.
µÚÈý¾ä£ºThe solution of the constants in equation (1) may be achieved using a Newton-Raphson procedure over a least squares solution provided at least three timed points exist on the gas release curve for stage 3 (Figure 2).
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