Mechanical energy nonconservative forces, like frictional forces, will be present, but often they are of negligible values and the mechanical energy's being constant can therefore be a useful approximation. In elastic collisions, the mechanical energy is conserved but in inelastic collisions, some mechanical energy is converted into heat. The equivalence between lost mechanical energy (dissipation) and an increase in temperature was discovered by James Prescott Joule. Many devices are used to convert mechanical energy to or from other forms of energy, e.g. an electric motor converts electrical energy to mechanical energy, an electric generator converts mechanical energy into electrical energy and a
Economy of Dalian There are the Dalian branches of China's five major banks: Bank of China, Industrial & Commercial Bank of China, China Construction Bank, Bank of Communications, and Agricultural Bank of China. Dalian Commercial Bank is now called Dalian Bank, which among other things handles processing of the Dalian Mingzhu IC Card for public transportation. Dalian Commodity Exchange is the only one of its kind in China, expanding the futures market beyond soybeans. A "Financial Street" around the new Commodity Exchange building is now being planned. Since the 1990s, Dalian City has emphasized the development of the IT industry, especially in Dalian