Puzzle WallThis type of wall material which is an alternative to bricks, cement and gypsum and terracotta blocks, is made of high quality plastic materials using special molds in various sizes and shapes. The use of these blocks does not require other materials and skilled labor. These blocks are inserted into each other using the tongue and groove joints. The interior and exterior layout of the building can also be designed in various patterns and colors.
Solar cell efficiency with band-gap energyDue to the industrial revolution and development of a smooth life style, the energy demand has been increasing day by day. On the other hand, the energy production by fuel burning produces dangerous pollutants, such as oxides of sulfur and nitrogen, carbon monoxide, carbon dioxide, hydrocarbons, and most significantly. For the above unsatisfactory situations, a search is going on all over the world for alternative energy sources.