Info

Figure 5.9. Failure kinetics in mixtures of systems with different redundancy levels. Initial period. The dependence of failure rate as a function of age in mixtures of parallel redundant systems having Poisson distribution by initial numbers of functional elements (mean number of elements, A = 1, 5, 10, 15, 20). Source: Gavrilov and Gavrilova, 2005.

Age, in dimensionless units

Figure 5.9. Failure kinetics in mixtures of systems with different redundancy levels. Initial period. The dependence of failure rate as a function of age in mixtures of parallel redundant systems having Poisson distribution by initial numbers of functional elements (mean number of elements, A = 1, 5, 10, 15, 20). Source: Gavrilov and Gavrilova, 2005.

have a tendency for convergence (compensation law of mortality).

The heterogeneous population model leads in principle to the same conclusions as the previously discussed model of series-connected blocks with varying degrees of redundancy. However, we are dealing with two fundamentally different models: whereas in the first model the individual risk of death is the same for all organisms and grows exponentially with age, in the second model there initially exist n subpopulations of living organisms with different risks of death which grow as a power function rather than exponential function of age. However, these different models seem to lead to virtually coincident interpretations of certain mortality phenomena. For example, the compensation effect of mortality is only possible, according to any of the models, when the rate of irreversible age changes is approximately constant within a given species. This interpretation of the compensation effect of mortality is not only a feature of the three models examined in this chapter, but also of other models (Gavrilov, 1978; Gavrilov et al., 1978; Strehler and Mildvan, 1960).

Thus, the heterogeneous population model provides an explanation for all the basic mortality phenomena (the exponential growth of the force of mortality in the initial period, with the subsequent mortality deceleration, as well as the compensation effect of mortality) even in the simplest case when the organism consists of a single vital block with n parallel elements. Generalizing the model to the case of m blocks connected in series in each organism does not present any problems if the blocks are n--

Blood Pressure Health

Blood Pressure Health

Your heart pumps blood throughout your body using a network of tubing called arteries and capillaries which return the blood back to your heart via your veins. Blood pressure is the force of the blood pushing against the walls of your arteries as your heart beats.Learn more...

Get My Free Ebook


Post a comment