• Semiconductor
    A semiconductor material has an electrical conductivity value falling between that of a conductor, like copper, gold, […]
  • Solar tracker
    A solar tracker is a device that orients a payload toward the Sun. Payloads are usually solar panels, parabolic […]
  • Biodiesel
    Biodiesel refers to a vegetable oil- or animal fat-based diesel fuel consisting of long-chain alkyl (methyl, ethyl, or […]
  • Whale watching tourism
    Whale watching is the practice of observing whales and dolphins in their natural habitat, enjoyed by millions of people […]
  • Diving emergency procedures
    The diver has a very limited ability to survive without a supply of breathing gas. Any interruption to that supply must […]
  • Armenian carpet
    The term Armenian carpet designates, but is not limited to, tufted rugs or knotted carpets woven in Armenia or by […]