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 Dalian Happy Snow World in Ganjingzi District near the airport. Not many people ride bicycles in Dalian because of the hilly roads. Dalian is also one of the many cities in China where there are few motorcycles, because motorcycle riding on most roads is banned by law. The city has a comprehensive bus system and an efficient metro system. As of November 2015, the Dalian Metro consists of the underground Line 1, Line 2, and the overground Line 12 (Formerly called line R2) and Line 3. New lines and expansion of the metro system are under way. The Dalian Tram