**Author details**

Radu Setnescu1,2 and Eduard-Marius Lungulescu<sup>2</sup> \*

1 Department of Sciences, Valahia University of Targoviste Faculty of Sciences and Arts, Targoviste, Romania

2 Department of Advanced Materials, INCDIE ICPE-CA (National Institute for Research and Development in Electrical Engineering), Bucharest, Romania

\*Address all correspondence to: marius.lungulescu@icpe-ca.ro

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