This dissertation is the milestone that ends a mission …and that opens the door to many others. We started this mission in 2019, and we are closing now in 2021. I say we (in the plural!) because I did not arrive, and I would never arrive here alone! And to those who were with me in body or spirit, those who brought me here, I thank you immensely... First of all my little black girls, my wife Amanda and my daughters Laura and Gabriela, because they are the ones that provide me with the happiness and daily joy that sustains me, that inspire me to grow. I thank you for your patience for the hours that I needed to study and couldn't walk away or play. Ubuntu! My teacher, advisor and partner Prof. Fatima Ludovico for sharing with me her strength, knowledge and determination to fulfill this mission. With her willingness to learn and to teach, she pushes us to be better and never give up. Gratitude! To my friends and companions, Jéssica, Felippe and Ana Carolina, for all the support, encouragement in the work and studies and early mornings on this journey. You were very important! To my people from SóDúdú Bola for bringing me my roots and never allowing me to forget our equals, who I am! Axe! To Jordão Energia and my co-workers