This paper exhibits the economic taxonomy of a minimal spanning tree constructed from the correlation matrix of daily returns of 65 stocks traded at the Bolsa Mexicana de Valores during a 8-year trading period. This paper also makes a classification of the risk and returns of these stocks...

Hydrogen has a wide range of applications. In view of the environmental benefits, hydrogen can be produced by decarbonized means. When alkaline electrolysis is the selected process, extra value is offered by flexible operation that could bring both; an opportunity to reduce the cost of hydrogen...

The recent growth of photovoltaic (PV) electricity generation despite its high levelized costs is largely explained by strong national policy supports. Indeed, renewable energy sources are receiving increasing support worldwide from public authorities because of the environmental benefits they...