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Fuel cells have, by design, a limited effective life time, which depends on how they are operated.
The theory of this paper is a simple extension of their method that covers all of the effective life time (∼100μs) of the impact sound pulse.
The general consent is that operation of the fuel cell at the extreme of the operational range, or operation of the fuel cell without sufficient reactants (a.k.a. starvation), will lower the effective life time of a fuel cell significantly.
This makes the blower bi-functional and as a result a higher supply of oxygen is often available, hence changes in the fuel cell output can be optimised by the knowledge of how much oxygen is supplied to the fuel cell at any given time, without reducing the effective life time of a fuel cell by starvation.
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Based on such examples from industry and from findings in the literature, we expect that our research can contribute to better design decisions, which ultimately results in production systems that are cost-effective over their whole life time.
The prompt neutron life time and effective delayed neutron fraction (βeff) with regarding to the perturbation theory, was calculated from the following relations (Fowler et al., 1971): (1) ι = ∑ g ∑ i V i (1 υ ) g Φ i,g ∗ Φ i,g 1 K ∑ i V i ∑ g.
Traditionally, coolants have a very short effective life in the machine, often times being disposed of as frequently as once per week.
This paper illustrates the transient characteristics of TRIGA core at different kinetics conditions that arise from variations of externally inserted reactivity together with variations in other kinetic parameters such as prompt neutron life time, lp and effective delayed neutron fraction, βeff provided the reactor scram system is disabled.
The third principle is that every forward march involves three overlapping struggles, which take time to spring into effective life.
The batteries that power most of our mobile computing devices measure their effective life in cycles – that is, the more times you fully deplete them and then charge them up again, the shorter they'll last.
These few effective life transforming tips will transform your life one smart decision at a time - if you take the action steps necessary and say yes to you and not others.
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