Degradation modelling symbols

Fig. 28.4. Degradation of phenol by a consortium of methanogens, as observed in a laboratory experiment by Bekins et al. (1998 symbols), and modeled using the Michaelis-Menten equation (solid line). Inset shows detail of transition from linear or zero-order trend at concentrations greater than KAy to asymptotic, first-order kinetics below this level. Broken line is result of assuming a first-order rather than Michaelis-Menten law.

FIGURE 19.24 TGA degradation of PA6 in nitrogen at different heating rates. Symbols denote experimental data and lines are the best fits from the model using one-step reaction mechanism. 

Figure 8.6 Time evolution of oligomer concentrations during poly(lactic acid) degradation in aqueous solution at 100°C. Symbols experimental data. Lines random chain scission model model dashed) and preferential chain end scission model continuous).

The following symbols are associated with the model i = fth state of the vehicle/transit system, where i = 0 (vehicle operating normally in the field), i = 1 (vehicle degraded in the field), i = 2 (vehicle failed in the field), i = 3 (vehicle in the repair workshop)... 

Figure 4.5 Best fits of the experimental data obtained by Weir et al. (2004) for PLLA using the model assuming fast crystallisation (solid lines) and the model without the assumption (dashed lines), respectively. The degradation data (discrete symbols) of molecular weight and degree of crystalfinity as functions of time were obtained at three temperatures (a) 37°C (b) 50°C and (c) 70°C. Source Taken from Gleadall et al., 2012.)...

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