Thermodynamic analysis and optimization of a multi-stage compression system for CO2 injection unit: NSGA-II and gradient-based methods - Bidgoli, Ali Allahyarzadeh; Mello, Paulo Eduardo Batista de; Dezan, Daniel Jonas; Saltara, Fábio; Salviano, Leandro Oliveira; Yanagihara, Jurandir Itizo (Journal of the Brazilian Society of Mechanical Sciences and Engineering, 2021)