فهرست مطالب مصطفی جوکار

The ultimate goal of development is to improve the condition of the people materially and spiritually. Hence, social planning and policy-making must pay attention to this important issue. In this study, we intend to review the fourth, fifth and sixth development plans with a focus on social issues and a look at the government's performance in various issues of health, education, employment, trust and social capital. Which topic or axes did each of these programs focus on the most? What advantages have they had? What gaps have they had. The research method was descriptive and analytical and library tools were used.

This paper presents an integrated model as a combination of fuzzy analytical hierarchy process (FAHP), scenario-based two-stage stochastic programming and robust optimization approaches for the problem of supplier selection and order allocation under supply risk conditions. Uncertainties in the supply of materials are considered under three scenarios: increased sanctions, stability of sanctions, and sanctions removal. In the first step, the main qualitative factors for the selection of suppliers are identified and a specific weight is assigned to each supplier through FAHP. In the second step, these weights are introduced as inputs to a two-stage stochastic programming model and affect the second-stage variables. In the third step, we use the Mulvey formulation and then linearize the resulted robust two-stage stochastic model. The model is a integer linear programming model solved by CPLEX for a case study and the results are discussed. Finally, a sensitivity analysis is performed on the parameters of the robust model and the balance between the total cost and the unfulfilled demand is shown.

Weld area and weld depth/width ratio can be considered to be of the most important geometrical factors in pulsed laser welding. The effects of carbon dioxide and oxygen additions to the argon shielding gas on the weld properties in pulsed laser welding of low carbon steel is investigated. Presence of carbon dioxide and oxygen up to 10 and 15 percent respectively decreases the weld geometrical factors. But، at higher levels of additions، the weld geometrical factors will increase. It is observed that the plasma plume temperature decreases from 6000K to 5500K with the addition of 15% carbon dioxide but increases to 7700K with 25% carbon dioxide addition. Increase in laser absorption coefficient، laser energy absorption، formation of oxide layer on the work-piece surface، exothermic reactions and their competitive effects can be considered as the competing phenomena involved in such a behavior in the weld profile.