This paper reviews researches on net present value done by researchers in the past 25 years to summarize research results and put forward limitations. Although investment decision guided possesses a long history investors use it widely current financial market, author believes that still has of being discussed studied. After comprehensive review, is found years, focused comparing its advantages...

Maintenance planning and activities have grown dramatically in importance across many industries and are increasingly recognized as drivers of competitiveness if managed appropriately. Correlated with this observation is the proliferation of maintenance optimization techniques in the technical literature. But while all these models deal with the cost of maintenance (as an objective function or ...

Today, producing solutions for the effective and efficient use of energy resources is among priority areas in almost every sector. In terms consumption, each solution developed building sector has a great impact on reducing total consumption. this study, different types insulation materials used walls roof were investigated cost-effectiveness order to improve performance located 1st degree day ...

Renewable systems influence the process of supplying domestic electricity demands. It will be useful to replace the conventional energy generation system by renewable energy sources since the uncontrolled use of fossil fuels is accompanied by global warming and environmental hazards, in addition to the danger of their depletion, and because most of the energy derived from these fuels are used i...