Sharif Digital Repository

In recent years, much attention has been paid to wind energy and the expansion of wind farms to replace fossil fuels with this energy source. Wind turbine blades are currently made of composite materials using thermoset matrices. These materials are not recyclable, and it is impossible to return their resins or fibers to the production cycle. In this research, an attempt has been made to replace thermoset resins with thermoplastic materials that can be recycled. In the following, manufacturing and performance aspects of thermoplastic resins have been examined, and the optimal material has been selected using the modified fuzzy logic method (MFLM). In this study, reactive processing of... 

Ever growing users’ demand for data traffic rate in mobile networks، the strict limitations on available spectrum، reducing operators’ expenditures for higher achievable revenue and also supporting significant number of simultaneous users in the network are among the most important drivers and motivations of operators to devise new structures in their current networks. One of the proposed structures aimed at offloading the traffic from cellular networks and responding to the requirements of 5th generation of mobile networks is direct device to device communications underlaying cellular networks. Interference management and proper frequency-time resource allocation should be taken under... 

The general and primary goal of this research was to identify the barriers to effective managerial coaching and their mechanisms of influence in an organization. With regard to deeper understanding of the context as the research progressed, the final goal of the study was to identify barriers to effective managerial coaching and their mechanism of influence when a manager faces employee’s undesirable performance, in a data center services unit. Managerial coaching is the manager’s practice of facilitating employee’s learning which improves the employee’s performance toward independent performance. The study was conducted in two main phases using grounded theory approach. Data was collected... 

Constantly rising fossil fuel consumption and the resulting air pollutants have caused hybrid electric vehicles to be considered as the most efficient mid-term solution for decreasing problems resulting from environmental pollutions and rising fuel prices. Various types of hybrid electric vehicles and power transmission schemes are studied in this thesis. Electric motors utilized in electric vehicles and hybrid electric vehicles such as induction motor, brushless permanent magnet motor, DC motor and switched reluctance motors are investigated based on previous studies and researches, and are compared for all basic criteria. For completing the comparison procedure and selecting the most...