Energy harvesting that are able to operate in higher temperature gradients, and that can conduct electricity well without also conducting heat (something that was until recently thought impossible ), will result in increased efficiency. Future work in thermoelectrics could be to convert wasted heat, such as in automobile engine combustion, into electricity. This type of harvesting is based on the changing capacitance of vibration-dependent capacitors. Vibrations separate the plates of a charged variable capacitor, and mechanical energy is converted into electrical energy. Electrostatic energy harvesters need a polarization source to work and to convert mechanical energy from vibrations into electricity. The polarization
Dalian Metro Dalian Metro The Dalian Metro or Dalian Subway is a rapid transit system in the city of Dalian, Liaoning, China. The metro opened on 1 May 2003. The system currently in operation consists of 4 lines: Line 1, Line 2, Line 3, and Line 12. Line 1, opened in 2015 currently in operation, connects east southeast central Dalian with north Dalian. The total length is 28.34 kilometers, with 22 underground stations. Line 2, opened in 2015 currently in operation, connects east central Dalian with west central Dalian. The total length is 42.56 kilometers, with 29 underground stations. The line is