This work presents a technical and economic analysis of a power supply system based on a 5 kW Proton Exchange Membrane Fuel Cell (PEMFC) fed with hydrogen produced by the auto-thermal reforming of ethanol. The technical analysis is based on unpublished experimental data obtained from the...

We construct a simple time stable two-parametric coherent states (CS) for the hydrogen atom, which is a system that presents degenerate levels. Analyzing the position variance for these CS, we are able to identify regions in the parameter space where the system behaves closer to a classical system.

We study the spin-glass problem within the Migdal-Kadanoff approximation of the hyper cubic lattices. Using various approaches, both analytical and numerical, we perform the real space renormalization of the problem. We find that a spin-glass transition occurs in three dimensions while it does...

Given an arbitrary probability distribution and a nondegenerate energy spectrum, so that a mean energy U can be computed, we derive the partition function Z and the entropic functional S that satisfy the basic relation dU=TdS. The procedure is illustrated by considering examples of typical...

The dynamics of the approach to equilibrium of the hydrogen atom is investigated numerically through a Monte Carlo procedure. We show that, before approaching ionization, the hydrogen atom may live in a quasi-equilibrium state, characterized by aging, whose duration increases exponentially as...

A special quantum-group oscillator presents an upper bound in its energy spectrum, which is preceded by an accumulation of infinite levels. The standard Boltzmann–Gibbs (BG) statistical-mechanics formalism is inadequate for dealing with such systems, since the partition function diverges for...

We show that the inclusion of long distance effect, expected in strong interactions, through a nonextensive thermodynamical approach is able to explain the experimental distribution of the transverse momentum of the hadrons with respect to the jet axis (pt)e+e−→hadron reaction. The observed...

The multifractal properties of the order parameter of Ising spin models on hierarchical lattices are investigated by an exact recursion procedure. Both pure and spin glass cases exhibit an order parameter with multifractal structure at the critical point. The connection between the multifractal...

Microscopic models, which resemble random magnetic systems, have been used recently in the literature for the description of financial markets. In the present work, a model with many interacting agents, similar to an Ising random magnet with infinite-range interactions, is investigated. The...

The critical properties of short-range Ising spin-glass models, defined on diamond hierarchical lattices of graph fractal dimensions df=2.58,3, and 4, and scaling factor 2, are studied via a method based on the Migdal–Kadanoff renormalization-group scheme. The order-parameter critical exponent...