Abstract: Recently, the highway construction projects in Iran have been confronted with delay, terminated, or postponed for several years. Although widespread studies have been investigated, regarding to delay issue in developed and developing countries, however, only few studies addressed in Iran. Due to the importance of delay issue and lack of sufficient studies regarding to this topic in Iran, this study aimed to first, discover the most significant causes of delay in highway construction projects, second; prioritize, and rank the critical factors, in order to highlight them for highway construction projects authorities. A verified questionnaire prepared and distributed among the experts in the construction projects of Iran. The valid collected data analyzed by Exploratory Factor Analysis (EFA) to uncover the underlying structure of variables and reduce the number of them. Moreover, Analytical Hierarchy Process (AHP), as one of the prevalent decisions making tools, applied to prioritize and

• Publication Date: 29-Apr-2018
• DOI: 10.15224/978-1-63248-150-4-27
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Abstract: Wells turbine can be described with the continuous movement of the turbine blades for a mandatory one direction by bidirectional air flow to supply a nonstop electric power. For the present study, finite element simulations were performed after the pilot experimental studies, to optimize the number and size of the blades to evolve the efficiency. Two dissimilar wells blade system was preferred out of three, while different combinations are considered during the numerical approximation. For the diverse air velocities, tangential force and pressure characteristics were evaluated using the numerical fluid dynamics approximation. Eventually, the simulation results were compared with the pilot experiments and concluded with an eligible overlap via satisfactory convergence of the FEM code.

• Publication Date: 29-Apr-2018
• DOI: 10.15224/978-1-63248-150-4-28
• Views: 0
• Downloads: 0