The great majority of the electric installations belong to the first and second category. In order to ensure a high level of reliability of their electric system feeder, two power supply sources are envisaged, one principal, the other of reserve, generally a cold reserve (electric diesel group). The principal source being under operation, its control can be ideal and sure, however for the reser...

the aim of this study was to represent effective componentsin demand chain which help organizations attain high performance levelsthrough identification of these components and determining theirdegree of importance. the following questions were major ideas of thisstudy: what are the most effective components in demand chain? andhow are they effective on organizational performance? to this end,m...

The purchasing policy of spare parts for maintenance and the reverse inventory chain logistics has been attracting researcher’s attention in recent years. In spare parts (SP) inventory control the aim is to maintain the inventory at an optimal level and to minimize the purchasing and the inventory costs. This paper deals with integration of the recycled spare parts in the economic models of inv...

General preventive maintenance model for the components of a system, which improves the reliability to ‘as good as new,’ was used to optimize the maintenance cost. The cost function of a maintenance policy was minimized under given availability constraint. On the other hand, in order to ensure appropriate reliability and availability, the development of the optimal maintenanc...

Nowadays, the design of a strategic supply chain network under the incidence of disruption is regarded as one of the important priorities of governments. Supplying sustainable petrochemical products is considered as a strategic goal by managers who require reliable infrastructure design. Crisis conditions such as natural disasters and sanctions have a destructive effect on the raw materials and...

the revenue management concept and techniques are applied to model the coordination of supply chain elements. the fundamental premise of this approach is synchronization of a group of business entities consist-ing of a manufacturer and multiple suppliers to achieve an optimal supply chain capacity plans. the output of the supply chain can be various products and thus it is measured in terms of ...

in recent years, there has been a great concern about strategic supply chain management. the supply chain configuration approach is related to strategic management of material and information flows. most of suggested configurations in the part of strategic direction are based on environmental factors and structure-conduct-performance approach. exploring supply chain configuration with emphasis ...

objective: ecstasy, or 3, 4 (±) methylenedioxymethamphetamine (mdma), is a potent neurotoxic drug. one of the mechanisms for its toxicity is the secondary release of glutamate. mouse embryonic stem cells (mescs) express only one glutamate receptor, the metabotropic glutamate receptor 5 (mglu5), which is involved in the maintenance and self-renewal of mescs. this study aims to investigate whethe...

Production planning and maintenance are two important problems in manufacturing systems. Despite the relationship exists between these two problems due to sudden failures and production capacity occupied by maintenance activities, each of these problems planned separately and as a result program and model efficiencies reduce in the real world. The aim of integrated production and maintena...