Sharif Digital Repository

Today, incremental manufacturing processes are rapidly evolving and expanding. These processes are used for the rapid fabrication of prototypes as well as the fabrication of parts with high geometric complexity and high dimensional accuracy. These processes are used in various fields such as manufacturing industrial parts, medicine, precision casting, etc. One of the most important incremental manufacturing processes that has received much attention today is the selective laser processing process. One of the problems of this process is the limitation in the use of different polymers for processing. Polyamide 12 currently has about 90% market share due to its high processability. However,... 

With the rapid increase of energy consumption, energy problem has been a global issue, which must be faced with and solved. One way to prevent energy consumption is to reduce drag in the flow inside the pipes by using polymer additives; Because the Transportation of liquids using pipeline technology has its limitations, since turbulent flow inside the pipe involves a loss of energy. The net effect of this is that increasing the energy applied to the flow does not increase the flow rate. For this purpose, copolymers and terpolymers of hydrophilic acrylamide monomers along with hydrophobic styrene and hydrophilic maleic anhydride monomers were synthesized by reverse emulsion polymerization...