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...

conclusions the castings fabricated from the ringless technique with non-precious alloy are acceptable. this investing system is useable for the fabrication of fixed restorations. results after statistical evaluation, the following results were obtained: the mean vertical margin discrepancy for conventional investing was 156.72 ± 64.67µ; for the ringless technique it was 117.3 ± 26.77µ; and for...

In this chapter we present a number of techniques to extend the lifetime of an energy-constrained sensor network. Defining the lifetime as the time it takes for the first node in the network to die, the presented protocols attempt to minimize the energy consumption of the network. Yet, at the same time the protocols may use sub-optimal paths so as to reduce the burden of routing on nodes that a...

One of the most important applications of wireless sensor networks is data collection. This paper proposes as efficient approach for data collection in wireless sensor networks by introducing Member Forward List. This list includes the nodes with highest priority for forwarding the data. When a node fails or dies, this list is used to select the next node with higher priority. The benefit of th...

One of reasons that researchers in recent years have tried to produce ultrafine grained materials is producing lightweight components with high strength and reliability. There are disparate methods for production of ultra-fine grain materials,one of which is severe plastic deformation method. Severe plastic deformation method comprises different processes, one of which is Parallel tubular chann...

metal forming processes, compared with machining ones, reduce production steps and increasemanufacturing speed in addition to saving raw material. in this paper, forming process of column ofa steering mechanism is investigated by finite element analyses and experimental tests; andoptimum die design parameters are found. forming process parameters including die opening angle,bearing length, clea...

Zusammenfassung Das Lymphödem ist eine multifaktorielle Erkrankung, die durch Ödem, interstitielle Fibrose und, im späteren Verlauf, Fettgewebsablagerungen charakterisiert ist. klinische Erscheinungsbild variiert je nach Stadium und geht mit unterschiedlich großen physischen, psychologischen sozioökonomischen Einschränkungen einher. Ein kann sowohl primär aufgrund genetisch bedingter abnormer E...