List of Articles

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  1 - Evaluation of the Cryogenic Effect on Friction Stir Processed AA7075/Si Matrix Nanocomposites
  Navid Molla Ramezani Behnam Davoodi
  Friction-stir processing is a green manufacturing process for surface composite fabrication and surface modification. To achieve this critical goal, the type of cooling and lubrication are of great importance. Therefore, in this paper, the cryogenic effects were investi More

  Friction-stir processing is a green manufacturing process for surface composite fabrication and surface modification. To achieve this critical goal, the type of cooling and lubrication are of great importance. Therefore, in this paper, the cryogenic effects were investigated on friction-stir processing (FSP) tool wear and surface quality of an aluminum matrix nanocomposite. Silicon carbide (SiC) nanopowder was used as the reinforcing phase. The effects of cooling strategy and tool rotation speed on the tool wear, microhardness, surface roughness, and energy dispersive spectroscopy (EDS) analysis were studied. The cooling procedure was conducted under dry and cryogenic conditions. Additionally, the rotation speed was set at three levels, while other parameters were kept constant. The FSP tools were examined under a scanning electron microscope, and the wear mechanisms were investigated under different conditions. The results showed that tool wear, surface roughness, and microhardness were improved under cryogenic conditions compared to air conditions. Furthermore, in the presence of liquid nitrogen, the metal matrix composite did not exhibit any microstructural defects, such as micro-cracks. Energy dispersive spectroscopy analysis also demonstrated that SiC had better penetration into the base material under cryogenic conditions compared to dry conditions. Manuscript profile
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  2 - Study of the Impact of Supply Chain Sustainability Dimensions on Sustainable Competitive Advantage with the Mediating Role of Production Flexibility and Strategic Flexibility (Case Study: Dairy Industry of Fars Province)
  Shahab Heidari Belgheis Bavarsad Majid  Nili Ahmad Abadi Saber Mola Alizade Zavardehi
  In today's competitive markets, organizations must possess a high level of adaptability to gain a competitive edge. To explore the impact of a sustainable supply chain on sustainable competitive advantage, this study examined strategic flexibility and flexibility-produc More

  In today's competitive markets, organizations must possess a high level of adaptability to gain a competitive edge. To explore the impact of a sustainable supply chain on sustainable competitive advantage, this study examined strategic flexibility and flexibility-productivity as mediating variables. The research focused specifically on the dairy industry in Fars province and involves industry experts from the domestic sector, selected through judgment sampling. Data was collected via a questionnaire, and Structural Equation Modeling (SEM) was employed for analysis. The findings of the study indicated that the economic, environmental, and social dimensions of supply chain sustainability have a significant influence on product flexibility. Additionally, these dimensions have a notable impact on strategic flexibility, except for the social dimension's effect on production flexibility. Furthermore, both production and strategic flexibility positively and significantly contribute to the achievement of sustainable competitive advantage. In conclusion, this research highlighted the importance of a sustainable supply chain in attaining sustainable competitive advantage. The economic, environmental, and social dimensions play a crucial role in enhancing both product and strategic flexibility. By embracing sustainable practices and fostering flexibility in production and strategy, organizations in the dairy industry can maintain a competitive advantage over time. Manuscript profile
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  3 - Evaluating the Potential of Polycaprolactone/Heparinized Nano Fluoro Hydroxyapatite Composite Scaffolds for Advancing Bone Tissue Engineering: A Comprehensive Analysis of Biodegradability and Water Absorption
  Nila Haghani Nahid Hasanzadeh Nemati Mohammad Taghi Khorasani Shahin Bonakdar
  The primary purpose of this study is to produce a composite scaffold using polycaprolactone (PCL) and heparinized nano-fluorohydroxyapatite for cancellous bone tissue engineering. The research investigated the impact of heparinized nano-fluorohydroxyapatite particles on More

  The primary purpose of this study is to produce a composite scaffold using polycaprolactone (PCL) and heparinized nano-fluorohydroxyapatite for cancellous bone tissue engineering. The research investigated the impact of heparinized nano-fluorohydroxyapatite particles on various properties of the scaffold, including water absorption, biodegradability, and alkaline phosphatase activity. The scaffold was produced using the phase separation (solid-liquid) method in combination with freeze-drying, and two different concentrations of heparinized nano-fluorohydroxyapatite powder were utilized. Biodegradability was assessed by submerging the scaffolds in phosphate-buffered saline for 6 weeks, showing that increased nano-fluorohydroxyapatite content enhanced biodegradability. PCL/10%w(H-nFHA50) exhibited the highest biodegradability rate. Water absorption analysis revealed that PCL scaffolds had lower water absorption compared to composite samples with heparinized nano-fluorohydroxyapatite, with PCL/10%(H-nFHA50) demonstrating the highest water absorption. Alkaline phosphatase activity was assessed on day 14 of cell culture, showing higher activity in heparinized samples compared to heparin-free samples in the presence of nano-fluorohydroxyapatite. The presence of heparin and nano-fluorohydroxyapatite in the scaffold structure likely contributed to this difference. No significant difference was observed between heparinized scaffolds with different nano-fluorohydroxyapatite concentrations. The results emphasize that the constructed scaffolds possess the potential for utilization in cancellous bone tissue engineering. Manuscript profile
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  4 - Experimental Investigation of the Effect of Using Tools with Tapered Pins in Friction Stir Welding (FSW) of AA6061-T6 Aluminum Alloy
  Saleh Al Khatour Maziar Mahdipour Jalilian Mahdi Karami Khorramabadi
  The present study investigated the effect of using tools with tapered pins in Friction Stir Welding (FSW) of AA6061-T6 aluminum alloy. Two techniques named conventional FSW and Refill Friction Stir Welding (RFSW) were used for this purpose. Five tools with different tap More

  The present study investigated the effect of using tools with tapered pins in Friction Stir Welding (FSW) of AA6061-T6 aluminum alloy. Two techniques named conventional FSW and Refill Friction Stir Welding (RFSW) were used for this purpose. Five tools with different tapered angles (0, 5, 10, 15, and 20 degrees) were used. To study the mechanical properties, tensile, three-point bending, and Vickers microhardness tests were performed. Macrographic and microstructural tests were also used to investigate the metallurgical properties of the welded samples. Based on the results, it was found that the key factors determining the ductility and strength of the welded specimens are the type of welding process (conventional FSW or RFSW) and the geometry of the tool pin (straight or tapered pin). Furthermore, it was found that all specimens welded by RFSW have higher tensile strength and elongation than the samples welded by conventional FSW. Manuscript profile