Draining parameter

Thus, the remaining difference from the Rouse model is a mode-dependent friction coefficient p=(Hpp) for (p>0), which leads to a relaxation mode spectrum with a different mode munber p-dependence. The second term in Hpq is the bead friction with the surrounding me um (solvent), which is the only term present in the Rouse model. The ratio of the diagonal (Rouse-like) friction and the solvent-mediated interaction strength may be expressed by the draining parameter The Rouse model has B=0, whereas the assumption... 

Intermediate situations between complete draining and total impermeability can be investigated if Eq. (62 ) is adopted for the draining parameter X in good solvents. If the expansion factor is taken to vary empirically with molecular weight according to an exponential law,... 

Table 11. The draining parameter X evaluated by various methods for solutions of cellulose and its derivatives 2-39 42-45>... 

Fig. 39. The difference between the Benoit-Doty persistence length q and the Yamakawa-Fujii persistence length qYF, — qYF, plotted versus the draining parameter X for cellulose and its derivatives in solution 67). The symbols in the figure are the same as in Fig. 38...

Sand Because of the fast rate of excess pore water stress dissipation, piles driven in sand are dominated by drained conditions and drained parameters are used in the analysis. 

For 0 conditions, eqn (4.166) is well confirmed. - For good solvent, experimental data have been interpreted in terms of the so called draining parameter , but the data might be interpreted by the above theory. Indeed eqns (4.166) and (4.167) indicate that the asymptotic slope of [G (m)]j and [G"(a))]j decreases as the solubility of the polymer increases, which is consistent with the experimental results. 

Double differential cross section 9 Draining parameter 124 Dynamic light scattering 21 Dynamic modulus 41,47,55... 

Just as the Gaussian chain is the basic paradigm of the statistics of polymer solutions, so is its extension to the bead-spring model still basic to current work in the held of polymer dynamics. The two limiting cases of free draining (no hydrodynamic interaction between beads, characterized by the draining parameter A = 0) and non-free draining (dominant hydrodynamic interaction, A= CO, due to Rouse and Zimm, respectively, are sufficiently familiar that the approach is often known as the Rouse-Zimm model. ... 

---