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This paper resumes the main mathematical models of Fuel Cells (PEM models). In particular, a comparison study of the various models introduced in the technical literature is presented and the dependency of the various model parameters is analyzed in different operating conditions. As the manifold of the model parameter is very wide and their determination is difficult, it is mandatory to introduce approximations and simplifications on which each model is based. The novelty of this work is the organization of the existing models in three categories with regard to the number of free parameters and to the dependency of such parameters on the different running conditions and the usage of a reference model in order to compare the difference between the latter once both in terms of fast execution of the simulation and care of the simulation results

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The Greek gods are collectively designated in the literary sources as Olympian, with a clear reference to their seat on the top of Olympos mountain, or more generally in heaven. Beginning with nineteenth‐century scholarship, Olympian deities have been considered a monolithic divine category separate from the chthonic deities in a dichotomous understanding of Greek religion.