1. CPGEI Federal Univers. of Technology-Paraná,Curitiba,Brazil
2. Federal Univers. of Technology-Paraná,Mechanical Engineering Department,Curitiba,Brazil
3. PPGFA Federal Univers. of Technology-Paraná,Curitiba,Brazil
4. Federal University of Minas Gerais,Physics Department,Belo Horizonte,Brazil