احسان سوری

Currently, dissimilar metal joining processes are receiving considerable attention in various industries. The objective is to create composite structures that are both high-strength and lightweight, ultimately reducing the weight of the final product. Researchers have recently proposed friction drilling as a new method for creating joints between dissimilar metal sheets. This innovative technique offers potential advantages in achieving the desired outcomes. In this process, metal sheets are placed on top of each other and simultaneously subjected to friction drilling. As a result, this process not only creates an effective space for tapping but also establishes a frictional joint between the two sheets. Research has shown that preheating up to 350°C can have desirable effects on reducing the gap between the two sheets in the vicinity of the created joint between aluminum and stainless steel using the above-mentioned method. In the upcoming work, the effect of preheating on tool wear in simultaneous friction drilling of aluminum sheet AA6061T6 and stainless steel AISI304L using a tungsten carbide drilling tool has been experimentally analyzed, and the findings indicate that increasing the preheating temperature up to 350°C leads to a 13.77% increase in tool adhesive wear and a 0.46% increase in tool abrasive wear.

Despite the significant growth of international congenital companies, especially in the field of information and communication technology in the world, in Iran, but the number of congenital companies International ICT is scarce. The aim of this study was to identify the distinctive features of the internal agent of the company in congenital companies The ratio between algorithms compared to other IT technologies is their success in global markets. The "case study" strategy for this qualitative applied research and the analysis method were a combination of "explanation" and "case study integration". The audience for the semi-sample in-depth interviews with members and experts of the company was sixty-eight.Ten companies were selected by stratified random sampling method and studied over twenty-six months. Atlas ti analytical software is used to encode the data and Xmind software is used to draw the model. The research findings indicate that "communication", "international presence", "values", "marketing", "strategy", "human capital" and "production method" are the distinguishing features of companies to succeed in Fast entry into international markets.

The warpage which has been occurred in the injected molded parts has always been a problem, as it may affect the function of the part and make it unusable. The main factors which has some effects on warpage of parts are the differential cooling, differential shrinkage, orientation effects and corner effects. According to the part each one of these effects may has the most impact on the warpage of the part. The most important reason which creates shrinkage in the parts is the difference between the temperatures of two sides of the molds (core side and cavity side), it is possible to minimize this shrinkage by decreasing this differential temperature. After a couple of analysis in Moldflow software it’s been shown that the differential cooling has the most influence on warpage of the part. It is possible to control the differential cooling with the coolant temperature which inters to the cooling channels of the mold. In order to find the optimized coolant temperature for both sides of the mold to decrease warpage of the part, a DOE analysis has been prepared. It’s been shown that the difference between the temperatures of the sides of the mold has much more influence than the average temperature of these sides on the warpage of the parts.

Along with the developments of the late twentieth century a new mission was defined for universities in knowledge-based economic era that bounded the university to “economic development” in addition to education, research and knowledge production. Accordingly, universities are facing a very wide range of stakeholders which small to large government agencies and private firms are included. This has caused universities to modify their structure and function to create a close relationship with industry. For this purpose, basic model of university-industry relations after collecting data were analyzed using PCA. After confirming assumed model by using regression analysis, the relationship between the university and industry factors on ultra market, knowledge-technology market, and entrepreneurship were analyzed. Results of research showed human resources and university infrastructure has positive effect on entrepreneurship and Technology market. Technology and infrastructure of university have effect on ultra market. Finally, the modified model for university and industry in this field of study has presented.