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 ...

Centre for Plant Health/BioMarka, School of Agriculture and Food Systems, Faculty of Land and Food Resources, The University of Melbourne, Parkville, Victoria, Australia 3010 School of Forestry and Ecosystem Science, Faculty of Land and Food Resources, The University of Melbourne, Parkville, Victoria, Australia 3010 Current Address: Department of Primary Industries-Bundoora, Victoria, Australia...

Developmental plans of the country emphasize on the exports-focused growth strategy, and export diversification is one of the most appropriate policies in this area. Export diversification moves from primary goods to industrial goods. Yet, export diversification, according to the principles of international trade, must be based on comparative advantage until to change value-added. Changes in th...