Sharif Digital Repository

Designing the structure of organization is one of the most important issues confronting all managers, especially those in large corporations. Structure design process consists of making several trade-offs about parameters that are affected with various contingency factors. This leads manages to confusion so some of them have no plans for progressing this process. Referring to organization theory and design, one sees a large number of models of organizational structure design. But there is not any means to compare them with each other. In this research, next the introduction of a conceptual feed-back model of organizational structure design process, three well-known processes in the last... 

In this research, the effects of natural and artificial aging heat treatments on the mechanical and wear behavior of an aluminum alloy from the 7xxx series have been investigated. The study commenced with annealing of the received samples, which were subsequently divided into four categories. One of these categories was placed in a freezer as annealed samples, while the other two underwent artificial aging heat treatments at temperatures of 180 and 210 degrees Celsius. The final category naturally aged over time. As a result, different structures with varied distributions and morphologies of precipitates were formed, and the mechanical properties, mechanisms, and wear resistance of the... 

As a result of extraction from underground oil and gas reservoirs, the pore pressure in the reservoir decreases and the effective stress increases accordingly. Although the gradual consolidation of underground reservoirs and their compaction due to the extraction can improve the production process (Compaction Drive) and facilitate the release of hydrocarbon fluid, it may cause some problems. Field measurements in the past two decades have shown that in addition to the change of effective stress, the total horizontal and vertical stress field can also change in and around the reservoir. As a result of the settlement that occurs at the upper part of the reservoir due to the consolidation...