Since ages the natural photosynthesis has sustained human civilization by providing food, fuel and the life sustaining environment, which is now threatened by the twin challenges of energy security and global warming. Researchers all over the world have turned to artificial photosynthesis for future sustainable life on this planet.  Artificial …

A communications satellite is an artificial satellite that relays and amplifies radio telecommunications signals via a transponder; it creates a communication channel between a source transmitter and a receiver at different locations on Earth. Satellite communications networks servicing large number of users comrise of  user terminals, satellites and a ground …

Like the British Royal Navy more than a century before it, the U.S. Navy has a command of the sea that affords the United States unrivaled international influence.  By its use of the sea, which covers nearly three-quarters of the earth, a navy can do things that land-based forces cannot. …