Acknowledgments This study was carried out with the financial support received from POR Campania 2000/2006 — misura 3.17. The authors thank Dr. Vito Campagnuolo of Nashira Hard Metals Company for substantial collaboration and his suggestions
AcknowledgmentsThis study was carried out with the financial support received fromPOR Campania 2000/2006 — misura 3.17. The authors thank Dr. VitoCampagnuolo of Nashira Hard Metals Company for substantial collaborationand his suggestions