1. Department of Physics, State University of Paraiba, Campina Grande 58429-500, Brazil
2. CONSTRUCT-LFC, Department of Civil Engineering, Faculty of Engineering, University of Porto, 4200-465 Porto, Portugal
3. Department of Sanitary and Environmental Engineering, State University of Paraiba, Campina Grande 58429-500, Brazil
4. Department of Mechanical Engineering, Federal University of Campina Grande, Campina Grande 58429-900, Brazil
5. Postgraduate Program in Process Engineering, Federal University of Campina Grande, Campina Grande 58429-900, Brazil