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References in periodicals archive ?
The disadvantage is that ion exchanges in the soil solution might lead to an apparent lower solute retardation factor. The major drawback is that we were forced to work with single solutes because TDR does not distinguish between different solutes.
The retardation factor ([R.sub.f]) of rotenone in concentrated liquid crude extract was fairly similar with rotenone standard with the value of 0.61 and 0.63 respectively (p>0.05).
Retardation factor and characteristic impedance expressions at low frequencies can be obtained from (1) and (2)
Experimental values for the diffusion coefficient and retardation factor of TMPD-MIB in latex paint are nonexistent in the published literature; hence, a back-calculation of both parameters was obtained using a best fit of the model described herein to experimental data for latex paint applied on gypsum board.
The retardation factor remained constant at 1.001 [+ or -] 0.004 but K increased from 1.06 to 20.5 [cm.sup.2]/h and P fell from 696 to 36 as [beta] increased from 0.013 to 1.20 as a consequence of increasing density difference.
The retardation factor ([R.sub.f]), corresponding to the ratio between the velocity of the water (or the conservative tracer, [v.sub.HTO]) and the velocity of the RN ([v.sub.RN]), can be directly obtained by the comparison of both curves.
Results of simulation of meander system (retardation factor and input impedance versus frequency) are presented in Fig.
The retardation factor did not vary with velocity; mean values and standard deviations (n = 12) were 0.998 [+ or -] 0.003 for [Br.sup.-], 0.999 [+ or -] 0.002 for [K.sup.+], and 1.004 [+ or -] 0.003 for EC.
Characteristics of the hybrid HMH structure (retardation factor and input impedance versus frequency), calculated using the multiconductor line method are presented in Fig.
BTCs of uranin plume were analysed by the method of time moments to determine the velocity and retardation factor of the plume.
After that we can find values of the retardation factor Kr and frequency f :