Variation of the errors in determining with time ( was obtained by using Le Claire’s relation): (a) , , (b) , . Errors were estimated according to .
Variation of the derivative with obtained for (a) and (b) .
(a) Variation of the derivative as a function of calculated by using a modified Whipple’s solution (see text) for different ratios at (b) Variation of the derivatives with for at different diffusion times (Whipple’s original solution). Le Claire’s constant is also indicated. The dashed curves were obtained for increased sample length and indicate problems related to a finite length.
Errors in determining calculated by using improved derivatives ( and ) in Le Claire’s original expression [Eq. (7)].
The maxima of the dependences plotted against the dimensionless parameter for different ratios .
Variation of the modulus of the maximum of (in ) with for different . The result is shown on a logarithmic scale.
A comparison of the derivatives at the maximum found by using calculated dependences (true) and Eq. (9) for .
The values of the slope for various .
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