Procedia Technology 19 ( 2015 ) 77 – 84

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2212-0173 © 2015 Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).Peer-review under responsibility of “Petru Maior” University of Tirgu Mures, Faculty of Engineeringdoi: 10.1016/j.protcy.2015.02.012

© 2015 Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).Peer-review under responsibility of “Petru Maior” University of Tirgu Mures, Faculty of Engineering

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78 Ioan Curtu et al. / Procedia Technology 19 ( 2015 ) 77 – 84

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82 Ioan Curtu et al. / Procedia Technology 19 ( 2015 ) 77 – 84

83 Ioan Curtu et al. / Procedia Technology 19 ( 2015 ) 77 – 84

84 Ioan Curtu et al. / Procedia Technology 19 ( 2015 ) 77 – 84