A two part study utilizing polyoxymethylene (POM) was undertaken to investigate a three stage process (melt-extrusion/annealing/uniaxial-stretching) (MEAUS) utilized to produce microporous films. In this report, the thermal annealing (second stage) and subsequent uniaxialstretching (third stage) results of selected POM films from two commercial resins, labeled D & F, are discussed. Specifically...

The article is considered a comparative analysis for predicting defect such as dimple by energy method of power balance, upper bound and finite element method. takes into account the geometrical position dimension dimple, criterion formation in balance presence minimum point function relative pressure on velocity metal outflow vertical direction. New engineering calculations are developed combi...

one of the most important parts of power transmission in automotives is c.v. joint, which consists of four components where exterior bowl is one of them. due to its complexity, and importance in automobile and existence of high stresses, forging process is the only cost effective method of production. hence, the best method of production of this part is forging process. the exterior part of c.v...

Introduction Bar extrusion is a process in which a block of metal (billet) is forced to flow by compression through a tool (die) opening of a smaller crosssectional area than that of the original billet. There are two basic types of bar extrusion: direct and indirect. The most important and common method used is the direct extrusion (Lange 1988). Figure 1 shows the principle of direct bar extru...

BACKGROUND This study aimed to identify key symptoms that could be associated with the diagnosis of acute forms of symptomatic apical periodontitis (SAP) and symptomatic irreversible pulpitis (SIP), and to identify a diagnostic algorithm based on these symptoms. METHODS In this prospective, observational study 173 emergency patients diagnosed with acute pain of endodontic origin and no swelli...