Sharif Digital Repository

In present research, Numerical investigation of the turbine nozzle performance due to pulsating flow of a constant volume combustion gas turbine engine has been done. For this purpose, first the blade row is modeled with the BladeGen tool of ANSYS software and then, using the TurboGrid tool, a structured three-dimensional grid is generated and simulated by the ANSYS CFX solver. After simulation, numerical solution validation was performed using the available data. In the last step, after ensuring the boundary conditions and numerical solution methods, the effect of different parameters on the performance of the turbine nozzle is investigated. Finally, to observe the effect of geometric... 

Fatigue is one of the most common failure modes that reduce the structural integrity of asphalt pavements. Dynamic tests are used as fatigue performance indicators for asphalt mixture. However, these tests are expensive and require special equipment and set up. At this research, the main goal is to develop a fuzzy model which is more efficient than the existing regression model for prediction of the fatigue life. A database from the available data from various research was compiled. For each model, a comparison between Fuzzy and regression output by actual outputs was done and it was seen that the fuzzy modeling can predict fatigue life very closely. Finally, the required software for this... 

Acoustic science and it’s applications in thermodynamic, cause the new achievements in different field of scientific and industrial. Thermoacoustic is a new technique of acoustic that analyzes the thermodynamic fluctuations related to time and displacement. In other word, thermoacoustic is a field of transformation between acoustic energy and thermal energy. Thermoacoustic devices Include refrigeration equipment, motors, pumps, heat or a combination of these devices that are used to transfer and convert acoustic energy to thermal energy. The thermoacoustic systems that their functions are based on the interaction between acoustic wave and gas particle that does exist it’s around are new... 

Non-Fungible Tokens (NFTs) are unique assets on the blockchain that prove ownership of various digital assets. Presently, a wide range of assets, such as digital art, music, tweets, and virtual assets in the metaverse, are being traded. Since there is no reliable standard for valuing NFTs, identifying criteria and correlations for their valuation and understanding the influence of social networks on these assets is crucial. Two key factors are identified in this process: (1) opinions, thoughts, and feedback from real individuals, and (2) the content of the token itself. Since these factors represent different types of data—textual and visual—two distinct analytical approaches are proposed....