محسن سبکتکین

Climate change is one of the biggest challenges facing humanity that affects the sciences related to nature and environment. Changes in factors affecting climate change affect the hydrological responses of watersheds and this phenomenon affects the quantity and quality of water resources such as lakes, reservoirs and dams. Today, the development and progress of computer and computing technologies has had a significant impact on hydrological modeling. In recent years, conceptual and physical models based on the characteristics of watersheds for hydrological systems have attracted the attention of researchers. Due to the emergence of such developments, there will be complications in the process of hydrological modeling. Correct management forecasts in the field of water resources due to the lack of water resources, is one of the topics of interest in the institutions in charge of water resources management, which should use high-precision simulator models for long-term estimates and planning. Considering the crisis and shortage of water resources in Iran, the sub-catchment upstream of Zayandeh Rood Dam was selected as a case study in this research, and the hydrological processes in the sub-basins of Zayandeh Rood Dam were simulated and the inflow to the reservoir of Zayandeh Rood Dam was estimated. For this purpose, the water and soil assessment model SWAT has been used to simulate the rainfall-runoff process and finally to estimate the inflow to the reservoir. Based on the simulated runoff from the three sub-basins of Buin-Damneh, Qala Shahrokh-Chelgerd and Chadegan-Ceshmeh, the model showed acceptable results for the simulation in the three sub-basins mentioned by the model, and it was estimated from the algebraic sum of the three inflows that the mentioned error coefficients are equal to 0.86 has been obtained. This result shows the high accuracy of the models in the simulation

TWinning Induced Plasticity (TWIP) steels, with high manganese percentage (17-35%), are used in automotive bodies. Their microstructure at room temperature is austenitic and due to low stacking fault energy, major deformation mechanism in them is twinning inside austenite grains which on the other hand, leads to enhanced mechanical strength in steel. Due to important effect of heat treatment process on mechanical properties, full annealing heat treatment and effect of Molybdenum were investigated in this study. To this aim, the steel was casted and hot rolled and then heat treated at different temperatures and the obtained microstructures were analyzed using optical, SEM and TEM microscopes. The results showed that the full annealing temperature for steel without Mo was determined to be 1100 C. and addition Mo to the steel annealing Temperature by 50 C reduced.