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2 – Entropy vs. temperature for methane CH 4 , ethane C 2 H 6 , propane C 3 H 8 , butane C 4 H 10 , carbon dioxide í µí° ¶í µí±‚ 2 , water í µí°» 2 í µí±‚, nitrogen í µí± 2 , oxygen í µí±‚, carbon dioxide í µí° ¶í µí±‚and hydrogen í µí°» 2 . 

2 – Entropy vs. temperature for methane CH 4 , ethane C 2 H 6 , propane C 3 H 8 , butane C 4 H 10 , carbon dioxide í µí° ¶í µí±‚ 2 , water í µí°» 2 í µí±‚, nitrogen í µí± 2 , oxygen í µí±‚, carbon dioxide í µí° ¶í µí±‚and hydrogen í µí°» 2 . 

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The main objectives of the present thesis were to adapt the current technology of thermal machines for biofuels use, in order to have engines which are not sensitive to the physicochemical characteristics of these non-conventional fuels. In addition, it aims to identify biofuels that have the desired properties and found the most influential proper...

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