At the Second World Conference on Coal held recently in London,a consensus was reached on the principal and continuing role played by coal on the world market i
The Primulaceae is a large subcosmopolitan family of 22 genera and about 1,000 species with a wide diversity in morphological features as well as in ecological
Electrodynamic tethered deorbit technology is a novel way to remove abandoned spacecrafts like upper stages or unusable satellites. This paper investigates and