In this study, we investigate calcium aluminate phases that were prepared by three different solid phase synthesis methods and a sol-gel method (with and without EDTA). The purpose of this study is to compare these three methods in terms of achieving higher purity, optimal phase and complexity in the production of the final product. Comparing the results, we found that the sol-gel method is mo...

The Iranian National Tax Administration is obliged to design a job system based on a preceding evolution to modify and align the human resources services with the implementation of the comprehensive tax plan. Therefore, this study was an attempt to identify and validate the key jobs and the competencies required for the key jobs using a suitable model development method with the aim of attracti...