the main objective of an extrusion die is flow balancing as an unbalanced flow causes a distorted product together with residual stress. in this paper a strategy is presented for flow balancing a u-shaped profile with different wall thicknesses. for this purpose, a choker bar is provided at thicker wall to locally restrict excessive flow passing through the thicker section. for optimal design s...

BACKGROUND International studies show that most people prefer to die at home; however, hospitals remain the most common place of death (PoD). This study aims to investigate the patterns in PoD and the associated factors, which are crucial for end-of-life cancer care enhancement. METHOD This retrospective, population-based study analyzed all registered cancer deaths in Qatar between January 1,...

shape error due to elastic recovery of formed part in unloading known as springback, is one of the most important problems of tool design in sheet metal forming processes. many researches have been performed for proposing an efficient method to decrease or compensate springback error in sheet forming processes. these methods are usually based on iterative finite element algorithms. in this pape...

this research work is devoted to the development of a mathematical model for the simulation of the flow of polymeric melts through the die region of extruders. a set of governing equations are solved using finite element method. standard galerkin technique is used in conjunction with the mixed scheme to solve the flow equation. due to the non-linear nature of global equations, the picard iterat...

Profile extrusion is a production technique to make polymer profiles and hollow tubes. At certain distance after the die exit extrudate guided into cooling chamber, where cooled extensively set part dimensions. Uniform in chamber required avoid warpage twisting of due differential shrinkage. The effect on shape residual stresses final product are numerically studied. Two different cases studied...

The effect of squeeze casting process parameters on wear behavior of AC2A aluminium alloy was primarily investigated in this experimental study. Five process parameters, namely squeeze pressure, pouring temperature, die temperature, die material and compression time, each at four levels were chosen and sixteen experimental runs based on L16 orthogonal array were performed. From analysis of vari...

As new generations of electronic products emerge they often surpass the capability of existing packaging and interconnection technology and the infrastructure needed to support newer technologies. This movement is occurring at all levels: at the IC, at the IC package, at the module, at the hybrid, the PC board which ties all the systems together. Interconnection density and methodology becomes ...

SUMMARY  An abnormal increase in serum potassium afte-r administration of suxamethonium is known to occur in the treatment of burns, trauma, teta­nus and neurological disorders. A table shows how long this abnormal reaction lasts approxi­mately in the different categories. A few cases of cardiac arrest following suxamethonium in­jection are described in detail. The pa;thogene­sis of this abnor...