The classical electrostatic image principle for a perfectly conducting object consisting of two orthogonally intersecting spheres is revisited through vector analysis. A method for finding the image of a given charge distribution by splitting it in three virtual singlesphere problems is described. Also, a simple relation between the image charges of a given point charge is found. The method is ...

Processing of minerals and production of metals has increased greatly in recent years. As a result, the quantities of waste material and pollutants have also increased. In many cases technology has changed to cope with the problem. Processes have been either modified to decrease emissions, or replaced by others that are less polluting even if at a higher cost. This paper briefly reviews example...

Technology innovation is the key motivation to push strategic emerging industry development. Research on key factors to influence industrial technological innovation is essential to enhance strategic emerging industrial technology innovation. This paper analyzes the various factors that influence industrial technology innovation by the fixed effects variable coefficient model. Through the expan...