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Showing 2 results for Haerian Ardakani
Volume 8, Issue 1 (4-2008)
Abstract
ECO is one of the relatively successful regional trade associations over the world and Iran is also an active member since it has been founded. After collapse of the Soviet :union:, a group of new independent Moslem countries along with Afghanistan has joined the ECO. Since Russia and China have strong economy and located in the ECO member regoin, this study examines the effects of joining these two countries in the ECO.
Based on the econometric estimates of gravity models, in the first model in which the common border among countries under study is not considered, the joining of Russia will increase the volume of trade among the countries compared to the current situation. In the second model in which the common border is considered, the greatest trade will be achived when both countries, Russia and China, join the ECO. Based on the findings of three different models, if Russia and China join individualy, the average increase in the capcity of trade among the ECO members will be 74.0, 67.4, and 42.1 percentage.
A. Faramarzian Haghighi, A. Haerian Ardakani, M. Kafaee Razavi, A. Moloodi,
Volume 19, Issue 8 (August 2019)
Abstract
In this study, the mechanical properties of one of the most widely used polymeric biomaterials in the body called Poly Lactic Acid (PLA) in the porous state were evaluated. Firstly, the initial regular porous structures, based on the tetrahedron-catheter model known as Kelvin model, were designed for simulating bone tissue, using 3D design software with FDM technique. Afterwards, pressure test was used to determine the mechanical properties and mode of failure. Finally, experimental results were compared with the simulation software analysis results. The results showed that increasing the porosity reduces the strength and the increasing the cell size in a constant porosity results in increased compressive strength. Also, by decreasing the porosity, the amount of the strain up to fracture increases in a relatively constant stress. The brittle failure at 45° in the samples of high porosity was shown. However, the samples with a lower porosity had a relative ductile behavior and as the pressure rises, the cells accumulate on each other and change the form to the fracture point. Comparing the empirical and the simulation results showed that there is a good agreement between them and the simulation model has a high reliability for the porous model.
