In Unmanned Manufacturing Factory (UMF), we consider a workstation consisting of machine and several workbenches, each assigned an AGV to perform the parts transporting service. Every workpiece requires multiple processes at same workbench, time for transport part is greater than assemble it. This operating model complex, as workpieces corresponding workbenches are in service time. We extract p...

The structural performance, reliability and durability of polymer composites can now be correlated with three generic classes of internal defects. The _first generic class of chemical structure defects (size 10-lOOA) that control critical design properties such as glass transition T 0 , moisture absorption, and dimensional changes can be controlled by chemical analysis of raw materials prior to...

the main objective of this study is to investigate the production factors productivity in large manufacturing sub-sectors. for this purpose, using statistical data for period 1972-2004, we have tried to study and analyze the trend and level of production factors productivity (partial and total productivity) in each sub-sectors classified according to isic two digits code. the average and margin...

Semiconductor manufacturing is generally considered to be the most complex of manufacturing processes. Reasons for this include tightly constrained production processes, reentrant process flows, expensive sophisticated equipment, variable demand, high levels of automation and an ocean of data. Yet, despite the difficulties, semiconductor manufacturing is a key industry in many industrialized na...

Cellular manufacturing system, an application of group technology, has been considered as an effective method to obtain productivity in a factory. For design of manufacturing cells, several mathematical models and various algorithms have been proposed in literature. In the present research, we propose an improved version of discrete particle swarm optimization (PSO) to solve manufacturing cell ...

Cellular materials, metallic bodies with gaseous voids, are a promising class of materials that offer high strength accompanied by a relatively low mass. Unfortunately, existing manufacturing techniques constrain a designer to a predetermined part mesostructure, material type, and macrostructure. In this paper, the authors document their design rationale for the selection of the Three-Dimension...

background: mushroom tyrosinase a potent candidate in clinical studies known as polyphenol oxidase, is a metaloenzyme from the oxidase superfamily widely distributed from lower to higher life forms. it plays a crucial role in sclerotization of exoskeleton in insects, also responsible for skin pigmentation in mammalians. objective: in this study, after reconstitution of mt by some metal ions, th...